Service Guide 8753ES Option 011 Agilent Technologies Network Analyzer Part Number 08753-90485 Printed in USA June 2004 Supersedes Print Date: June 2002 Agilent Technologies, Inc.
WARRANTY STATEMENT THE MATERIAL CONTAINED IN THIS DOCUMENT IS PROVIDED “AS IS,” AND IS SUBJECT TO BEING CHANGED, WITHOUT NOTICE, IN FUTURE EDITIONS. FURTHER, TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, AGILENT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED WITH REGARD TO THIS MANUAL AND ANY INFORMATION CONTAINED HEREIN, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
Assistance Product maintenance agreements and other customer assistance agreements are available for Agilent Technologies, Inc. products. For information about these agreements and for other assistance, contact Agilent. Refer to “Assistance” on page 15-2. Safety and Regulatory Information The safety and regulatory information pertaining to this product is located in Chapter 15 , “Safety and Regulatory Information.” Safety Notes The following safety notes are used throughout this manual.
Documentation Map The Installation and Quick Start Guide provides procedures for installing, configuring, and verifying the operation of the analyzer. It also will help you familiarize yourself with the basic operation of the analyzer. The User’s Guide shows how to make measurements, explains commonly-used features, and tells you how to get the most performance from your analyzer. The Reference Guide provides reference information, such as specifications, menu maps, and key definitions.
Contents 1. Service Equipment and Analyzer Options Required Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2 Principles of Microwave Connector Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5 Analyzer Options Available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6 Service and Support Options . . . . . . . . . . . . . . . . . . . . . .
Contents Fractional-N Frequency Range Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-39 Frequency Accuracy Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-42 High/Low Band Transition Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-45 Fractional-N Spur Avoidance and FM Sideband Adjustment . . . . . . . . . . . . . . . . . . . . . . .
Contents 7. Source Troubleshooting Source Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-2 Assembly Replacement Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-3 Before You Start Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-4 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contents 13. Replaceable Parts Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-2 Replacing an Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-3 Rebuilt-Exchange Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-4 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Service Equipment and Analyzer Options 1-1
Service Equipment and Analyzer Options Required Tools and Equipment Required Tools and Equipment The following is a list of the tools required to service your analyzer: • T-8, T-10, T-15, T-20, and T-25 TORX screwdrivers • Flat-blade screwdrivers — small, medium, and large • 5/16-inch open-end wrench (for SMA nuts) • 2-mm extended bit Allen wrench • 3/16, 5/16, and 9/16-inch hex nut drivers • 5/16-inch open-end torque wrench (set to 10 in-lb) • 2.
Service Equipment and Analyzer Options Required Tools and Equipment Table 1-1 Service Test Equipment Required Equipment Critical Specifications Recommended Model or HP/Agilent Part Number Usea Spectrum Analyzer Freq.
Service Equipment and Analyzer Options Required Tools and Equipment Table 1-1 Service Test Equipment Required Equipment Critical Specifications Recommended Model or HP/Agilent Part Number Usea RF Cable (3) 24-inch, Type-N, 50 Ω 8120-4781 P RF Cable 50Ω, 7-mm, 24-inch, phase-matched 11857D P GPIB Cable 10833A/B/C/D A, P BNC Cable 8120-1840 A, P Low Pass Filter >50 dB @ 2.
Service Equipment and Analyzer Options Principles of Microwave Connector Care Principles of Microwave Connector Care Proper connector care and connection techniques are critical for accurate, repeatable measurements. Refer to the calibration kit documentation for connector care information. Prior to making connections to the network analyzer, carefully review the information about inspecting, cleaning, and gaging connectors.
Service Equipment and Analyzer Options Analyzer Options Available Analyzer Options Available Option 1D5, High Stability Frequency Reference This option offers ±0.05 ppm temperature stability from 0 to 60 °C (referenced to 25 °C). Option 002, Harmonic Mode This option provides measurement of second or third harmonics of the test device's fundamental output signal. Frequency and power sweep are supported in this mode. Harmonic frequencies can be measured up to the maximum frequency of the receiver.
Service Equipment and Analyzer Options Service and Support Options Service and Support Options The analyzer’s standard warranty is a one-year return to Agilent Technologies service warranty. NOTE Chapter 1 There are many other repair and calibration options available from the Agilent Technologies support organization. These options cover a range of service agreements with varying response times. Contact Agilent for additional information on available service agreements for this product.
Service Equipment and Analyzer Options Service and Support Options 1-8 Chapter 1
2 Performance Tests 2-1
Performance Tests Introduction Introduction The performance of the analyzer is verified by confirming that the analyzer’s output and input behavior meets the instrument specifications. The instrument specifications are found in the chapter titled “Specifications and Characteristics” in the analyzer’s reference guide.
Performance Tests Introduction Performance Test Records Performance test records for each of the performance tests can be found at the end of this chapter. It is recommended that you use photocopies of the test records to record test results on. Certificate of Calibration Agilent Technologies will issue a Certificate of Calibration for the product upon successful completion of the performance tests.
Performance Tests 1. Source Frequency Range and Accuracy 1. Source Frequency Range and Accuracy Perform this test to verify the frequency accuracy of the analyzer over its entire operating frequency range. A frequency counter is used to determine the analyzer’s output frequency. Analyzer warm-up time: 30 minutes Specifications Frequency Range Frequency Accuracya 300 kHz to 3 GHz ±10 ppm 30 kHz to 6 GHzb ±10 ppm a. At 25 °C ±5 °C. b. Only for analyzers with Option 006.
Performance Tests 1. Source Frequency Range and Accuracy Figure 2-1 Source Frequency Range and Accuracy Test Setup 2. Press Preset Sweep Setup CW FREQ . 3. Press 300 k/m (or 30 k/m if the analyzer has Option 006) and write the frequency counter reading on the performance test record. 4. Repeat step 3 for each frequency listed in the performance test record. In Case of Difficulty 1. If any measured frequency is close to the specification limits, check the time base accuracy of the counter used. 2.
Performance Tests 2. Source Power Range, Linearity, and Accuracy 2. Source Power Range, Linearity, and Accuracy Perform this test to verify the power range and linearity at different CW frequencies throughout the analyzer operating frequency range. Analyzer warm-up time: 30 minutes Specifications Power Range Power Level Accuracya Specification ±1.0 dB Power Level Linearityb −5 to +15 dBm ±0.25 dB +15 to +20 dBm ±0.5 dB Option 006:c −5 to +13 dBm ±0.25 dB +13 to +18 dBm ±0.5 dB a.
Performance Tests 2. Source Power Range, Linearity, and Accuracy Procedure Path Loss Calibration 1. Connect the equipment as shown in Figure 2-2. Figure 2-2 Path Loss Calibration Test Setup (#1) 2. Zero and calibrate the power meter. Also set the power meter for dBm. For more information on how to perform this task, refer to the power meter documentation. 3. Press Preset Power 10 x1 . 4. Press Sweep Setup CW FREQ 300 k/m .
Performance Tests 2. Source Power Range, Linearity, and Accuracy Figure 2-3 Path Loss Calibration Test Setup (#2) 8. Press Sweep Setup this CW frequency. CW FREQ 300 k/m . Set the power meter calibration factor for 9. Write the power meter reading in the “Second Value” column on the performance test record. 10.Calculate the path loss through the power splitter with this formula: First Value − Second Value = Path Loss 11.Write the result on the performance test record. 12.
Performance Tests 2. Source Power Range, Linearity, and Accuracy Power Range and Power Linearity 13.Connect the equipment as shown in Figure 2-4. Figure 2-4 Power Range, Linearity, and Accuracy Test Setup 14.Press Preset Sweep Setup factor for this CW frequency. CW FREQ 300 k/m . Set the power meter calibration 15.Press Power 10 x1 . On the power meter, set the current power level as the reference for relative power (dB) measurements.
Performance Tests 2. Source Power Range, Linearity, and Accuracy 23.With the power offset value listed in the performance test record, calculate the source power level linearity using this formula: Power Linearity = [Power Offset] + [Measured Value] 24.Write the result of your calculation on the performance test record. 25.Repeat steps 21 through 24 for the other power levels listed on the performance test record. For Analyzers with Option 006 26.Press Sweep Setup CW FREQ 6 G/n . 27.
Performance Tests 2. Source Power Range, Linearity, and Accuracy In Case of Difficulty 1. Ensure that the power meter and power sensor are operating to specification. 2. Inspect the power splitter connectors. Poor match at these connections can generate power reflections that can cause the analyzer to appear to be out of specification. 3. Inspect the analyzer RF OUT connector for damage. 4. If any test fails, perform “RF Output Power Correction Constants (Test 47)” on page 3-11. 5.
Performance Tests 3. Receiver Minimum R Channel Level 3. Receiver Minimum R Channel Level Perform this test to verify the minimum R channel input power level at which phase lock can be accomplished. Analyzer warmup time: 30 minutes. Specifications Frequency Range Minimum R Channel Level 300 kHz–3 GHz −35 dBm 3 GHz–6 GHza −30 dBm a. Only for analyzers with Option 006.
Performance Tests 3. Receiver Minimum R Channel Level 2. Press Preset R. Meas 3. Press Marker Search TRACKING ON SEARCH:MAX to locate the maximum value of the R channel input signal. 4. Press Power −10 5. Press Sweep Setup x1 . CW FREQ 300 k/m . 6. Check the analyzer display for phase lock error messages: • If you do not observe a phase lock error message, write the marker value readout (which appears in the analyzer display) in the performance test record.
Performance Tests 4. External Source Mode Frequency Range 4. External Source Mode Frequency Range Perform this test to verify proper phase lock for selected test frequencies in the external source mode, at the specified minimum R input level of −25 dBm. Analyzer warmup time: 30 minutes Specifications Frequency Rangea 300 kHz–3 GHz 3 GHz–6 GHzb a. At −25 dBm R input level. b. Only for analyzers with Option 006.
Performance Tests 4. External Source Mode Frequency Range Figure 2-6 External Source Mode Frequency Range Test Setup 2. Preset the external source, and set the power level to 4 dBm, and the CW frequency to 10 MHz. 3. On the network analyzer, press Preset System INSTRUMENT MODE Sweep Setup CW FREQ 10 M/µ EXT SOURCE AUTO to set up the analyzer for an external source input to the receiver channel R. 4. Press Meas R. 5.
Performance Tests 5. Receiver Channel Noise Floor Level (Only for Analyzers without Option 006) 5. Receiver Channel Noise Floor Level (Only for Analyzers without Option 006) Perform this test to determine the analyzer receiver channel noise floor levels. Analyzer warmup time: 30 minutes. Specifications Frequency Range Receiver Input IF Bandwidth Average Noise Level 300 kHz–3.0 GHz A 3 kHz −90 dBm 300 kHz–3.0 GHz A 10 Hz −110 dBm 300 kHz–3.0 GHz B 3 kHz −90 dBm 300 kHz–3.
Performance Tests 5. Receiver Channel Noise Floor Level (Only for Analyzers without Option 006) Figure 2-7 Receiver Channel Noise Floor Level Test Setup 2. Press Preset −10 Power x1 . Receiver Channel A Noise Floor Level with 3 kHz IF BW 3. Press Meas A Format 4. Press Marker Fctn TRIGGER MENU LIN MAG Scale Ref MARKER MODE MENU SINGLE . AUTO SCALE . MKR STATS ON Sweep Setup 5. When the analyzer finishes the sweep, notice the mean value, which appears on the analyzer display. 6.
Performance Tests 5. Receiver Channel Noise Floor Level (Only for Analyzers without Option 006) Receiver Channel B Noise Floor Level with 10 Hz IF BW 13.Press Meas B Format 14.Press Sweep Setup LIN MAG . TRIGGER MENU SINGLE . 15.When the analyzer finishes the sweep, notice the mean value, which appears on the analyzer display. 16.Use the following equation to convert the linear magnitude mean value to log magnitude: Power (dBm) = 20 × [log10(linear magnitude mean value)] 17.
Performance Tests 6. Receiver Channel Noise Floor Level (Only for Analyzers with Option 006) 6. Receiver Channel Noise Floor Level (Only for Analyzers with Option 006) Perform this test to determine the analyzer's receiver channel noise floor levels. Analyzer warmup time: 30 minutes. Specifications Frequency Range Receiver Input IF Bandwidth Average Noise Level 300 kHz–3.0 GHz A 3 kHz −90 dBm 300 kHz–3.0 GHz A 10 Hz −110 dBm 300 kHz–3.0 GHz B 3 kHz −90 dBm 300 kHz–3.
Performance Tests 6. Receiver Channel Noise Floor Level (Only for Analyzers with Option 006) Figure 2-8 Receiver Channel Noise Floor Level Test Setup 2. Press Preset Start 50 k/m Stop 3 G/n Power −10 x1 . Channel A Noise Floor Level for 3 kHz IF BW (300 kHz–3 GHz) 3. Press Meas A Format 4. Press Marker Fctn TRIGGER MENU LIN MAG Scale Ref MARKER MODE MENU SINGLE . AUTO SCALE . MKR STATS ON Sweep Setup 5.
Performance Tests 6. Receiver Channel Noise Floor Level (Only for Analyzers with Option 006) Channel B Noise Floor Level for 10 Hz IF BW (300 kHz–3 GHz) 13.Press Meas B Format 14.Press Sweep Setup LIN MAG . TRIGGER MENU SINGLE . 15.When the analyzer finishes the sweep, notice the mean value, which appears on the analyzer display. 16.Use the following equation to convert the linear magnitude mean value to log magnitude: Power (dBm) = 20 × [log10(linear magnitude mean value)] 17.
Performance Tests 6. Receiver Channel Noise Floor Level (Only for Analyzers with Option 006) 31.Use the following equation to convert the linear magnitude mean value to log magnitude: Power (dBm) = 20 × [log10(linear magnitude mean value)] 32.Write this calculated value in the performance test record in dBm. Channel A Noise Floor Level with 10 Hz IF BW (3 GHz–6 GHz) 33.Press Meas A. 34.Press Sweep Setup TRIGGER MENU SINGLE . 35.
Performance Tests 7. Receiver Magnitude Frequency Response 7. Receiver Magnitude Frequency Response Perform this test to verify how well the analyzer transfers information from the RF to IF, and how accurately it processes and displays that information. Analyzer warmup time: 30 minutes. Specifications Frequency Range Magnitude Frequency Responsea 300 kHz–3 GHz ± 1 dB 3 GHz–6 GHzb ± 2 dB a. At 25 °C ± 5 °C; A, B, R, −10 dBm input. b. Only for analyzers with Option 006.
Performance Tests 7. Receiver Magnitude Frequency Response Figure 2-9 Magnitude Frequency Response Test Setup (Receiver Input R) 2. Zero and calibrate the power meter. Set it to measure dBm. 3. Press Preset Marker Meas 4. Press Sweep Setup CW FREQ meter for this CW frequency. R Power 300 6 x1 . k/m . Set the calibration factor on the power 5. Write the power meter reading on the performance test record. 6.
Performance Tests 7. Receiver Magnitude Frequency Response Figure 2-10 Magnitude Frequency Response Test Setup (Receiver Input A) 9. Press Meas A 10.Press CW FREQ Sweep Setup 300 to measure the power at the receiver input A channel. k/m . 11.Write the marker reading in the “A Input Power” column on the performance test record. 12.Repeat steps 10 and 11 for the other CW frequencies listed on the performance test record. Input B Magnitude Frequency Response 13.
Performance Tests 7. Receiver Magnitude Frequency Response 14.Press Meas B to start measuring the power delivered to receiver input B. 15.Press Sweep Setup CW FREQ 300 k/m . 16.Write the marker reading in the “B Input Power” column on the performance test record. 17.Repeat steps 15 and 16 for the other CW frequencies listed on the performance test record. 18.
Performance Tests 8. Receiver Phase Frequency Response (Ratio) 8. Receiver Phase Frequency Response (Ratio) Perform this test to determine the phase tracking frequency response for each pair of inputs (A/R, B/R and A/B) in the swept sweep mode. Analyzer warmup time: 30 minutes. Specifications Frequency Range Phase Frequency Responsea, b 300 kHz–3 GHz ± 3° 3 GHz–6 GHzc ± 10° a. Deviation from linear phase. IF BW ≤ 300 Hz and 3 second sweeptime for A/B measurements. b.
Performance Tests 8. Receiver Phase Frequency Response (Ratio) Figure 2-12 Phase Frequency Response Test Setup From 300 kHz to 3 GHz 2. Press Preset Start 3. Press Power 3 4. Press Avg 300 x1 IF BW k/m . SWEEP TIME Return 3000 3 x1 . 5. Only For Analyzers with Option 006: Press Stop 6. Press Format PHASE x1 . Marker Fctn 3 G/n . MARKER MODE MENU MKR STATS ON . 7. Press Scale Ref 0.6 x1 ELECTRICAL DELAY .
Performance Tests 8. Receiver Phase Frequency Response (Ratio) B/R Phase Frequency Response 12.Connect the second type-N cable from the RF cable set to port B. From 300 kHz to 3 GHz 13.Press CONTINUOUS 14.Press Meas B/R Start Format 300 k/m . PHASE . 15.Only For Analyzers with Option 006: Press Stop 3 G/n . 16.Press Scale Ref 0.6 x1 ELECTRICAL DELAY . Turn the analyzer front panel knob to vary the electrical delay until the trace is in the most linear horizontal position. 17.
Performance Tests 8. Receiver Phase Frequency Response (Ratio) Figure 2-13 Phase Frequency Response Test Setup From 300 kHz to 3 GHz 22.Press CONTINUOUS 23.Press Avg 24.Press Meas Start IF BW 300 A/B Format 300 k/m . x1 . PHASE . 25.Only For Analyzers with Option 006: Press Stop 3 G/n . 26.Press Scale Ref 0.6 x1 ELECTRICAL DELAY . Turn the analyzer front panel knob to vary the electrical delay until the trace is in the most linear horizontal position. 27.
Performance Tests 8. Receiver Phase Frequency Response (Ratio) In Case of Difficulty 1. Verify that the RF cables are in a good condition. Move the RF cables to different ports on the power splitter and re-measure the receiver input(s) that failed. 2. Perform “Sampler Magnitude and Phase Correction Constants (Test 53)” on page 3-19. 3. Consult Chapter 8 , “Receiver Troubleshooting,” for troubleshooting information.
Performance Tests 9. Receiver Input Crosstalk 9. Receiver Input Crosstalk Perform this test to verify the signal leakage interference between input and output test ports, with one port driven and the other one terminated. Analyzer warmup time: 30 minutes. Specifications Frequency Range Crosstalka 300 kHz–1 GHz −100 dB 1 GHz–3 GHz −90 dB 3 GHz–4.5 GHz −82 dB 4.5–6.0 GHz −75 dB a.
Performance Tests 9. Receiver Input Crosstalk Figure 2-14 R into A and R into B Crosstalk Test Setup 2. Press Preset Power AVERAGING ON 3. Press Scale Ref IF BW 1 x1 AVERAGING FACTOR Avg 5 x1 x1 . 10 x1 to get a better scaling of the data trace. 25 4. Press Marker Search 5. Press Stop x1 . 6 SEARCH:MAX . TRACKING ON G/n Sweep Setup TRIGGER MENU NUMBER of GROUPS 5 6.
Performance Tests 9. Receiver Input Crosstalk 14.Press Meas x1 . B/R TRIGGER MENU Sweep Setup NUMBER of GROUPS 5 15.When the analyzer finishes the number of sweeps, write the marker value, which appears on the analyzer display, on the performance test record. R into B Crosstalk from 1 GHz to 3 GHz 16.Press Start 5 x1 . 1 G/n Stop 3 G/n TRIGGER MENU NUMBER of GROUPS 17.
Performance Tests 9. Receiver Input Crosstalk 24.Press Meas x1 . A/B TRIGGER MENU Sweep Setup NUMBER of GROUPS 5 25.When the analyzer finishes the number of sweeps, write the marker value, which appears on the analyzer display, on the performance test record. B into A Crosstalk from 1 GHz to 3 GHz 26.Press Start 5 x1 . 1 G/n Stop 3 G/n TRIGGER MENU NUMBER of GROUPS 27.
Performance Tests 9. Receiver Input Crosstalk 33.Press Start 300 k/m Stop G/n . 34.Press Meas SINGLE . A/R Avg AVERAGING OFF 1 DATA → MEMORY 35.At the end of the sweep, press Display B/R . 36.Press Avg AVERAGING FACTOR TRIGGER MENU Sweep Setup 5 x1 NUMBER of GROUPS 5 TRIGGER MENU DATA/MEM AVERAGING ON Meas Sweep Setup x1 . 37.When the analyzer finishes the number of sweeps, write the marker value, which appears on the analyzer display, on the performance test record.
Performance Tests 9. Receiver Input Crosstalk 51.Press Avg AVERAGING FACTOR TRIGGER MENU 5 x1 NUMBER of GROUPS 5 AVERAGING ON Sweep Setup x1 . 52.When the analyzer finishes the number of sweeps, write the marker value, which appears on the analyzer display, on the performance test record. In Case of Difficulty 1. Check for loose external RF cables. Inspect all cables for signs of damage, wear, or faulty shielding. 2. Remove the analyzer top cover.
Performance Tests 10. Receiver Trace Noise 10. Receiver Trace Noise Perform this test to verify the receiver trace noise on a CW signal in ratio mode. Analyzer warmup time: 30 minutes. Specifications Frequency Range Ratio Trace Noise (Magnitude)a Trace Noise (Phase)a IF Bandwidth = 10 Hz 300 kHz to 3 GHz A/R < 0.001 dB rms < 0.006 °rms 300 kHz to 3 GHz B/R < 0.001 dB rms < 0.006 °rms 3 GHz to 6 GHzb A/R < 0.002 dB rms < 0.012 °rms 3 GHz to 6 GHzb B/R < 0.002 dB rms < 0.
Performance Tests 10. Receiver Trace Noise Figure 2-17 Receiver Trace Noise Test Setup 2. Press Preset Power 3. Press CW FREQ 3 10 x1 Sweep Setup NUMBER of POINTS 51 x1 . G/n . 4. Press Marker Fctn MARKER MODE MENU MKR STATS ON to enable the analyzer marker statistics feature. A/R Trace Noise Magnitude IF BW = 10 Hz 5. Press Avg IF BW 6. Press Meas 10 x1 . A/R . 7. Press Sweep Setup TRIGGER MENU SINGLE .
Performance Tests 10. Receiver Trace Noise A/R Trace Noise Phase IF BW = 3 kHz 14.Press Avg IF BW 3 k/m . 15.Press Sweep Setup TRIGGER MENU SINGLE . Wait for the sweep to finish as indicated by the Hld notation on the left side of the display. 16.Press Scale Ref AUTO SCALE . 17.Write the s. dev (standard deviation) value shown, which appears on the analyzer display, on the performance test record. A/R Trace Noise Magnitude IF BW = 3 kHz 18.Press Format LOG MAG . 19.
Performance Tests 10. Receiver Trace Noise B/R Trace Noise Phase IF BW = 10 Hz 31.Press Avg IF BW 10 x1 . 32.Press Sweep Setup TRIGGER MENU SINGLE . Wait for the sweep to finish as indicated by the Hld notation on the left side of the display. 33.Press Scale Ref AUTO SCALE . 34.Write the s. dev (standard deviation) value shown, which appears on the analyzer display, on the performance test record. B/R Trace Noise Magnitude IF BW = 10 Hz 35.Press Format LOG MAG . 36.
Performance Tests 11. Receiver Input Impedance 11. Receiver Input Impedance Perform this test to verify the return loss of each of the analyzer receiver inputs. Analyzer warmup time: 30 minutes Specifications Frequency Range Receiver Input Impedance 300 kHz–2 MHz ≥ 20 dB return loss 2 MHz–1.3 GHz ≥ 24 dB return loss 1.3 GHz–3 GHz ≥ 19 dB return loss 3 GHz–6 GHza ≥ 15 dB return loss a. For analyzers with Option 006.
Performance Tests 11. Receiver Input Impedance Figure 2-18 Receiver B Input Impedance Test Setup 2. Press Preset 3. Press Cal RETURN NOTE Start 300 k/m Sweep Setup SWEEP TYPE MENU CAL KIT SELECT CAL KIT CAL KIT:N 50 Ω 85032 CALIBRATE MENU S11 1-PORT . LOG FREQ . RETURN When you are performing error-correction for a system that has type-N test port connectors, the softkey menus label the sex of the test port connector—not the calibration standard connector. 4.
Performance Tests 11. Receiver Input Impedance 13.Press MARKER 1 1.3 G/n MARKER 2 to 1.3 GHz and 3 GHz respectively. 3 G/n to set marker 1 and marker 2 14.Use the analyzer front panel knob to move marker 2 to the peak value between 1.3 GHz and 3 GHz. Write the marker 2 reading on the performance test record under “B Return Loss (A/R),” 1.3–3 GHz. 15.For Option 006: a. Press MARKER 1 3 G/n MARKER 2 to 3 GHz and 6 GHz respectively. 6 G/n to set marker 1 and marker 2 b.
Performance Tests 11. Receiver Input Impedance 25.Press Marker MARKER 1 300 k/m MARKER 2 marker 2 to 300 kHz and 2 MHz respectively. 2 M/µ to set marker 1 and 26.Use the analyzer front panel knob to move marker 2 to the peak value between 300 kHz and 2 MHz. Write the marker 2 reading on the performance test record under “A Return Loss (B/R),” 300 kHz–2 MHz. 27.Press Marker MARKER 1 2 M/µ MARKER 2 marker 2 to 2 MHz and 1.3 GHz respectively. 1.3 G/n to set marker 1 and 28.
Performance Tests 11. Receiver Input Impedance 35.Press Cal CALIBRATE MENU S11 1-PORT . 36.Connect an open to the test port cable adapter. Press FORWARD: OPEN . 37.Connect a short to the test port cable adapter. Press SHORT . 38.Connect a 50 Ω termination to the adapted test port cable. Press LOAD DONE 1-PORT CAL . 39.Connect the equipment as shown in Figure 2-21. Figure 2-21 Receiver R Input Impedance Test Setup 40.Remove the 50 Ω termination from the test port cable adapter.
Performance Tests 11. Receiver Input Impedance 47.Use the analyzer front panel knob to move marker 2 to the peak value between 1.3 GHz and 3 GHz. Write the marker 2 reading on the performance test record under “R Return Loss (A/B),” 1.3–3 GHz. 48.For Option 006: a. Press MARKER 1 3 G/n MARKER 2 to 3 GHz and 6 GHz respectively. 6 G/n to set marker 1 and marker 2 b. Use the analyzer front panel knob to move marker 2 to the peak value between 3 GHz and 6 GHz.
Performance Tests 12. Receiver Magnitude Dynamic Accuracy 12. Receiver Magnitude Dynamic Accuracy The analyzer’s receiver linearity versus input power is measured with a calibrated step attenuator. Measurement uncertainty is minimized by using the analyzer’s capability to perform error correction.
Performance Tests 12. Receiver Magnitude Dynamic Accuracy Required Equipment Description HP/Agilent Part or Model Number Power Meter 436A/437B/438A or E4418B/E4419B Power Sensor 8482A Step Attenuator, 110 dB 8496A Option H19 (See note below.
Performance Tests 12. Receiver Magnitude Dynamic Accuracy Procedure Initial Calculations 1. Fill in the attenuator error values (referenced to 0 dB attenuation) in Table 2-1 by referring to the calibration data for the 8496A step-attenuator. Refer to the note below if the calibration data are not expressed as attenuation errors. a. Find the column in the 8496A attenuation error table that pertains to the attenuation errors for 30 MHz. b.
Performance Tests 12. Receiver Magnitude Dynamic Accuracy Table 2-1 Magnitude Dynamic Accuracy Calculations A B C D (B − C) E F (E − D) 8496A Attn. (dB) Attn. Error (ref 0 dB) 20 dB Error Value Attn. Error (ref 20 dB) Expected Measurement (dB) Expected Measurement (corrected) (dB) 0 0 dB 20 10 20 10 ( ) 0 dB 0 30 − 10 40 − 20 50 − 30 60 − 40 70 − 50 80 − 60 90 − 70 100 − 80 0.00 3.
Performance Tests 12. Receiver Magnitude Dynamic Accuracy Figure 2-22 Power Meter Calibration 8. Set the 8496A to 20 dB. 9. Set the following analyzer parameters: • Preset • NUMBER of POINTS • Power • Avg Sweep Setup 10 IF BW CW FREQ 51 30 M/µ x1 x1 10 x1 10.Set up the analyzer for power meter calibration: a. Select the analyzer as the system controller: • Local • SYSTEM CONTROLLER b. Set the power meter's address: • SET ADDRESSES • ADDRESS: P MTR/GPIB 13 x1 c.
Performance Tests 12. Receiver Magnitude Dynamic Accuracy 11.Take a power meter calibration sweep. • Cal • ONE SWEEP PWRMTR CAL −30 x1 TAKE CAL SWEEP 12.Verify that the power meter reads approximately −30 dBm. Full 2-Port Calibration 13.Connect the equipment as shown in the Figure 2-23. Be sure to reconnect the cable to the B channel connectors. Figure 2-23 Full 2-Port Calibration 14.Perform a full 2-port error correction with isolation. 15.Save the results of the new cal set.
Performance Tests 12. Receiver Magnitude Dynamic Accuracy Figure 2-24 Magnitude Dynamic Accuracy, Channel B 17.To set up the dynamic accuracy measurement, press the following: • Meas • Marker Fctn • Sweep Setup Trans: FWD S21 (B/R) MKR MODE MENU TRIGGER MENU MKR STATS ON SINGLE 18.Wait for the sweep to finish, then press Display DATA → MEMORY DATA/MEM . 19.Set the step attenuator to 0 dB. 20.Press Sweep Setup TRIGGER MENU SINGLE . 21.Press Format MORE REAL .
Performance Tests 12. Receiver Magnitude Dynamic Accuracy 25.Calculate the dynamic accuracy for each attenuator setting by using the formula: |G − F| (the absolute value of the difference between the values in column “G” and column “F”). Channel A Magnitude Dynamic Accuracy To measure the magnitude dynamic accuracy of channel A, the test set is switched to route transmitted power to the A sampler of the analyzer (an S12 measurement at port 1 and port 2 of the test set).
Performance Tests 12. Receiver Magnitude Dynamic Accuracy 4. Take a power meter calibration sweep. • Cal • ONE SWEEP PWRMTR CAL −30 x1 TAKE CAL SWEEP 5. Verify that the power meter reads approximately −30 dBm. Full 2-Port Calibration 6. Connect the equipment as shown in the Figure 2-26 Be sure to reconnect the cable to the A channel connectors. Figure 2-26 Full 2-Port Calibration 7. Perform a full 2-port error correction with isolation. 8. Save the results of the new cal set.
Performance Tests 12. Receiver Magnitude Dynamic Accuracy Note that the analyzer will display units as mU µU or nU, which are abbreviations for 10−3 units, 10−6 units, and 10−9 units, respectively. 15.Press IMAGINARY . Write the mean value (which appears on the analyzer’s display) in the column marked “Imaginary Part” in the performance test record. Note that the analyzer will display units as mU µU or nU, which are abbreviations for 10−3 units, 10−6 units, and 10−9 units, respectively. 16.
Performance Tests 13. Receiver Magnitude Compression 13. Receiver Magnitude Compression Perform this test to verify the compression/expansion magnitude levels of the analyzer's receiver samplers. Power sweeps from low to high power are made at designated CW frequencies. A reference measurement is made while the signal to the receiver is attenuated to avoid compression. The attenuation is removed and compression is observed and measured.
Performance Tests 13. Receiver Magnitude Compression Figure 2-27 Channel A Magnitude Compression Test Setup 3. On the analyzer, press Preset Avg IF BW 10 x1 . 4. Press Sweep Setup CW FREQ 300 k/m SWEEP TYPE MENU CW TIME . Set the calibration factor on the power meter for this CW frequency. 5. Press Power −4 x1 . Use the analyzer's front panel knob to adjust the source power for a power meter reading of −20.00 dBm.
Performance Tests 13. Receiver Magnitude Compression 12.Press ∆ MODE MENU ∆REF=1 . (This step is only necessary for the first frequency.) 13.Press Marker MARKER 2 Marker Search SEARCH: MAX . 14.Press Marker MARKER 3 Marker Search SEARCH: MIN . 15. Determine which value of marker 2 and marker 3 has the largest absolute value. Record this value in the column of the performance test record labeled “Measured Value.” 16.Press Sweep Setup CW FREQ 50 M/µ (or the next CW frequency from the test record).
Performance Tests 13. Receiver Magnitude Compression Channel B Magnitude Compression 24.Connect the equipment as shown in Figure 2-28. Figure 2-28 Channel B Magnitude Compression Test Setup 25.Press Meas B/R Sweep Setup TRIGGER MENU CONTINUOUS . 26.Repeat the procedure starting with step 4 for the CW frequencies listed in the performance test record. In Case of Difficulty 1. If the analyzer fails the channel A compression test, suspect the A5 A sampler assembly. Repeat this test.
Performance Tests 14. Receiver Phase Compression 14. Receiver Phase Compression Perform this test to verify the compression/expansion magnitude levels of the analyzer's receiver samplers. Analyzer warmup time: 30 minutes Specifications Frequency Range Receiver Channel Compressiona 300 kHz–3 GHz A ≤ 8.0 ° 3 GHz–6 GHzb A ≤ 8.1 ° 300 kHz–3 GHz B ≤ 8.0 ° 3 GHz–6 GHzb B ≤ 8.1 ° a. With 10 Hz IF bandwidth. b. Only for analyzers with Option 006.
Performance Tests 14. Receiver Phase Compression Figure 2-29 Channel A Phase Compression Test Setup 3. Press Preset Avg IF BW 10 x1 Format PHASE . 4. Press Sweep Setup CW FREQ 300 k/m SWEEP TYPE MENU CW TIME . Set the calibration factor on the power meter for this CW frequency. 5. Press Power −4 x1 . Use the analyzer's front panel knob to adjust the source power for a power meter reading of −20.00 dBm.
Performance Tests 14. Receiver Phase Compression 12.Press ∆ MODE MENU ∆REF=1 . (This step is only necessary for the first frequency.) 13.Press Marker MARKER 2 Marker Search SEARCH: MAX . 14.Press Marker MARKER 3 Marker Search SEARCH: MIN . 15. Determine which value of marker 2 and marker 3 has the largest absolute value. Record this value in the column of the test record labeled “Measured Value.” 16.Press Sweep Setup CW FREQ 50 M/µ .
Performance Tests 14. Receiver Phase Compression Channel B Phase Compression 24.Connect the equipment as shown in Figure 2-30. Figure 2-30 Channel B Phase Compression Test Setup 25.Press Meas B/R CONTINUOUS . Format PHASE Sweep Setup TRIGGER MENU 26.Repeat step 23 for the CW frequencies listed in the performance test record. In Case of Difficulty 1. If the analyzer fails the channel A compression test, suspect the A5 A sampler assembly. Repeat this test.
Performance Tests 15. Source and Receiver Harmonics (Option 002 Only) 15. Source and Receiver Harmonics (Option 002 Only) Perform this test to determine the 2nd and 3rd harmonics of the source and receiver.
Performance Tests 15. Source and Receiver Harmonics (Option 002 Only) Procedure Source Harmonics 1. Connect the equipment as shown in Figure 2-31. Figure 2-31 Source Harmonics Test Setup 2. Press Preset Power 20 x1 (or 18 x1 if the analyzer has Option 006) to set the test port power to +20 dBm (or +18 dBm). 3. Press Start 16 M/µ . To set the frequency range: If you do not have Option 006, press Stop 1.5 G/n . If you have Option 006, press Stop 3 G/n . 4. Press Avg IF BW 5.
Performance Tests 15. Source and Receiver Harmonics (Option 002 Only) If you have Option 006, press Stop 12.Press System HARMONIC MEAS 13.After one sweep, press Display trace. 14.Press Scale Ref 15.Press System 2 G/n . HARMONIC OFF . DATA → MEMORY DATA/MEM to normalize the AUTO SCALE to get a better viewing of the trace. HARMONIC MEAS 16.After one sweep, press Scale Ref 17.Press Marker Search HARMONIC THIRD . AUTO SCALE . SEARCH:MAX . 18.Write the marker 1 value on the performance test record.
Performance Tests 15. Source and Receiver Harmonics (Option 002 Only) 22.Repeat steps 11 through 18 to measure the receiver worst case 3rd harmonic for the receiver input B. 23.Press System HARMONIC MEAS HARMONIC OFF . 24.Repeat steps 5 through 10 to measure the receiver worst case 2nd harmonic for the receiver input A. Press Meas A in step 5. 25.Repeat steps 11 through 18 to measure the receiver worst case 3rd harmonic for the receiver input A. In Case of Difficulty 1.
Performance Tests 16. Harmonic Measurement Accuracy (Option 002 Only) 16. Harmonic Measurement Accuracy (Option 002 Only) This test verifies the network analyzer’s accuracy when operating in the harmonic measurement mode (Option 002). The analyzer’s reading is compared to that of the power meter. The allowable difference is shown in the “Specifications” table. Analyzer warmup time: 30 minutes Specifications Frequency Range Harmonic Measurement Accuracya 16 MHz–3 GHz ± 1.5 dB 3 GHz– 6 GHzb ± 3 dB a.
Performance Tests 16. Harmonic Measurement Accuracy (Option 002 Only) Procedure A Channel Harmonic Measurement Accuracy 1. Connect the equipment as shown in Figure 2-33. Figure 2-33 Harmonic Measurement Accuracy Test Setup 2. Zero and calibrate the power meter. Set the power meter to measure dBm. Refer to the power meter operating manual for more information on how to perform these tasks. 3. Preset the external source, and set the power level to −3.5 dBm and the CW frequency to 32 MHz.
Performance Tests 16. Harmonic Measurement Accuracy (Option 002 Only) 10.On the network analyzer, press System HARMONIC MEAS THIRD . Write the marker 1 reading in the “Input A Value” column on the performance test record. 11.On the network analyzer, press System HARMONIC MEAS OFF Sweep Setup CW FREQ 31 M/µ to set the analyzer to the next fundamental frequency. 12.On the external source, set the CW frequency to 62 MHz. Reset the power meter for the appropriate calibration factor. 13.
Performance Tests Performance Test Records Performance Test Records The performance test records in this chapter include entries up to 6 GHz for analyzers that have Option 006 (6 GHz operation). If your analyzer does not have Option 006, write “N/A” for entries above 3 GHz. Calibration Lab Address: Report Number Date Last Calibration Date Customer’s Name Performed by Model 8753ES Serial No.
Performance Tests Performance Test Records Agilent Technologies Company Model 8753ES Option 011 Report Number Serial Number Option(s) Date 1. Source Frequency Range and Accuracy Note: If your analyzer does not have Option 006, write “N/A” in all entries above 3 GHz. CW Frequency (MHz) Min. (MHz) Results Measured (MHz) Max. (MHz) Measurement Uncertainty (MHz) 0.03a 0.029 999 7 0.030 000 3 ±0.000 000 050 0.3 0.299 997 0.300 003 ±0.000 000 520 5.0 4.999 950 5.000 050 ±0.000 009 16.0 15.
Performance Tests Performance Test Records Agilent Technologies Company Model 8753ES Option 011 Report Number Serial Number Option(s) Date 2. Source Power Range, Linearity, and Accuracy: Path Loss Calculations Worksheet Note: If your analyzer does not have Option 006, write “N/A” in all entries above 3 GHz. CW Frequency (MHz) Source Output Power Level (dBm) 0.
Performance Tests Performance Test Records Agilent Technologies Company Model 8753ES Option 011 Report Number Serial Number Option(s) Date 2. Source Power Range, Linearity, and Accuracy: Power Range and Linearity Source Power Level (dBm) Power Offset (dB) Measured Value (dB) Power Linearity (dB) Spec (dB) Measurement Uncertainty CW Frequency = 300 kHz −5 +15 ±0.25 ±0.02 −3 +13 ±0.25 ±0.02 −1 +11 ±0.25 ±0.02 +1 +9 ±0.25 ±0.02 +3 +7 ±0.25 ±0.02 +5 +5 ±0.25 ±0.02 +7 +3 ±0.
Performance Tests Performance Test Records 2. Source Power Range, Linearity, and Accuracy: Power Range and Linearity (continued) Source Power Level (dBm) Power Offset (dB) Measured Value (dB) Power Linearity (dB) Spec (dB) Measurement Uncertainty CW Frequency = 3 GHz −5 +15 ±0.25 ±0.02 −3 +13 ±0.25 ±0.02 −1 +11 ±0.25 ±0.02 +1 +9 ±0.25 ±0.02 +3 +7 ±0.25 ±0.02 +5 +5 ±0.25 ±0.02 +7 +3 ±0.25 ±0.0035 +9 +1 ±0.25 ±0.0022 +11 –1 ±0.25 ±0.0014 +13a –3 ±0.25 ±0.
Performance Tests Performance Test Records 2. Source Power Range, Linearity, and Accuracy: Power Range and Linearity (continued) Note: If your analyzer does not have Option 006, write “N/A” in all entries on this page. Source Power Level (dBm) Power Offset (dB) Measured Value (dB) Power Linearity (dB) Spec (dB) Measurement Uncertainty CW Frequency = 6 GHz −5 +15 ±0.25 ±0.02 −3 +13 ±0.25 ±0.02 −1 +11 ±0.25 ±0.02 +1 +9 ±0.25 ±0.02 +3 +7 ±0.25 ±0.02 +5 +5 ±0.25 ±0.02 +7 +3 ±0.
Performance Tests Performance Test Records Agilent Technologies Company Model 8753ES Option 011 Report Number Serial Number Option(s) Date 2. Source Power Range, Linearity, and Accuracy: Power Level Accuracy Note: If your analyzer does not have Option 006, write “N/A” in all entries above 3 GHz. CW Frequency (MHz) Path Loss (dB) Calibrated Power Level (dB) Measured Value (dB) Power Level Accuracy (dB) Spec (dB) Measurement Uncertainty (dB) Source Output Power Level = +10 dBm 0.300 ±1.0 ±0.
Performance Tests Performance Test Records Agilent Technologies Company Model 8753ES Option 011 Report Number Serial Number Option(s) Date 3. Receiver Minimum R Channel Level Note: If your analyzer does not have Option 006, write “N/A” in all entries above 3 GHz. CW Frequency Specification (dBm) Marker Value (dB) Measurement Uncertainty (dB) 300 kHz < −35 ±1.0 3.29 MHz < −35 ±1.0 3.31 MHz < −35 ±1.0 15.90 MHz < −35 ±1.0 16.10 MHz < −35 ±1.0 30.90 MHz < −35 ±1.0 31.
Performance Tests Performance Test Records Agilent Technologies Company Model 8753ES Option 011 Report Number Serial Number Option(s) Date 4. External Source Mode Frequency Range Note: If your analyzer does not have Option 006, write “N/A” in all entries above 3 GHz. CW Frequency (MHz) Results 10 20 100 1 000 2 900 4 000a 5 000a 6 000a a. Option 006 only.
Performance Tests Performance Test Records Agilent Technologies Company Model 8753ES Option 011 Report Number Serial Number Option(s) Date 5 and 6. Receiver Channel Noise Floor Level Note: If your analyzer does not have Option 006, write “N/A” in all entries above 3 GHz. Frequency Range IF Bandwidth Specification (dBm) Calculated Value Measurement Uncertainty Receiver Channel A 300 kHz–3.0 GHz 3 kHz –90 ±1 300 kHz–3.0 GHz 10 Hz –110 ±1 300 kHz–3.0 GHz 10 Hz –110 ±1 300 kHz–3.
Performance Tests Performance Test Records Agilent Technologies Company Model 8753ES Option 011 Report Number Serial Number Date 7. Receiver Magnitude Frequency Response Note: If your analyzer does not have Option 006, write “N/A” in all entries above 3 GHz. CW Frequency Example Power Meter Reading –10.0 R Input Power –10.14 A Input Power –10.09 B Input Power –10.10 Greatest Difference 0.14 Spec. (dB) Meas. Uncer. (dB) ±1 300 kHz ±1 ±0.14 5 MHz ±1 ±0.10 16 MHz ±1 ±0.10 31 MHz ±1 ±0.
Performance Tests Performance Test Records Agilent Technologies Company Model 8753ES Option 011 Report Number Serial Number Date 8. Phase Frequency Response (Ratio) Note: If your analyzer does not have Option 006, write “N/A” in all entries above 3 GHz. Frequency Range Ratio Specification Measured Value Measurement Uncertainty 300 kHz–3 GHz A/R ±3° ±0.61° 3 GHz–6 GHza A/R ±10° ±1.54° 300 kHz–3 GHz B/R ±3° ±0.61° 3 GHz–6 GHza B/R ±10° ±1.54° 300 kHz–3 GHz A/B ±3° ±0.
Performance Tests Performance Test Records Agilent Technologies Company Model 8753ES Option 011 Report Number Serial Number Date 9. Receiver Input Crosstalk Note: If your analyzer does not have Option 006, write “N/A” in all entries above 3 GHz. Frequency Range Specification (dB) Marker Value Measurement Uncertainty R into A Crosstalk: 300 kHz–1.0 GHz –100 ±5.1 dΒ 1.0 GHz–3.0 GHz –90 ±5.1 dΒ 3.0 GHz–4.5 GHza –82 ±5.4 dΒ 4.5 GHz–6.0 GHza –75 ±5.4 dΒ 300 kHz–1.0 GHz –100 ±5.1 dΒ 1.
Performance Tests Performance Test Records Agilent Technologies Company Model 8753ES Option 011 Report Number Serial Number Date 10. Receiver Trace Noise Note: If your analyzer does not have Option 006, write “N/A” in all entries above 3 GHz. Ratio IF BW Phase/Magnitude Measured Value Specification (rms) Test Frequency: 3 GHz ≤0.001 dΒ A/R 10 Hz Magnitude A/R 10 Hz Phase ≤0.006° A/R 3 kHz Phase ≤0.038° A/R 3 kHz Magnitude ≤0.006 dΒ B/R 3 kHz Magnitude ≤0.
Performance Tests Performance Test Records Agilent Technologies Company Model 8753ES Option 011 Report Number Serial Number Date 11. Receiver Input Impedance Note: If your analyzer does not have Option 006, write “N/A” in all entries above 3 GHz. Frequency Range B Return Loss (A/R) A Return Loss (B/R) R Return Loss (A/B) Specification (dB) Measurement Uncertainty (dB) 300 kHz–2 MHz ≥20 ±0.6 2 MHz–1.3 GHz ≥24 ±0.6 1.3 GHz–3 GHz ≥19 ±0.6 3 GHz–6 GHza ≥15 ±2.0 a. Option 006 only.
2-88 HP/Agilent 8496A Attn. (dB) 0 10 20 30 40 50 60 70 80 90 100 Test Port Power (dBm) −10 −20 −30 (ref) −40 −50 −60 −70 −80 −90 −100 −110 Option(s) Serial Number Date Report Number Real Part Imag. Part Receiver Measurement (dB) G 0.00 Expected Measurement (Corrected) (dB) F Dynamic Accuracy (Calculated) |G − F| 12. Test Port Receiver Magnitude Dynamic Accuracy (Channel B) Agilent Technologies Company Model 8753ES Option 011 ±3.322 ±1.203 ±0.411 ±0.152 ±0.077 ±0.
Chapter 2 HP/Agilent 8496A Attn. (dB) 0 10 20 30 40 50 60 70 80 90 100 Test Port Power (dBm) −10 −20 −30 (ref) −40 −50 −60 −70 −80 −90 −100 −110 Option(s) Serial Number Date Report Number Real Part Imag. Part Receiver Measurement (dB) G 0.00 Expected Measurement (Corrected) (dB) F Dynamic Accuracy (Calculated) |G − F| 12. Test Port Receiver Magnitude Dynamic Accuracy (Channel A) Agilent Technologies Company Model 8753ES Option 011 ±3.322 ±1.203 ±0.411 ±0.152 ±0.
Performance Tests Performance Test Records Agilent Technologies Company Model 8753ES Option 011 Report Number Serial Number Date 13. Receiver Compression—Magnitude Note: If your analyzer does not have Option 006, write “N/A” in all entries above 3 GHz. CW Frequency Start Power (dBm) Stop Power (dBm) Measured Value (dB) Specification Measurement Uncertainty 300 kHz ≤0.55 dB ±0.05 dB 50 MHz ≤0.55 dB ±0.05 dB 1 GHz ≤0.55 dB ±0.05 dB 1.65 GHz ≤0.55 dB ±0.05 dB 2 GHz ≤0.55 dB ±0.
Performance Tests Performance Test Records Agilent Technologies Company Model 8753ES Option 011 Report Number Serial Number Date 14. Receiver Compression—Phase Note: If your analyzer does not have Option 006, write “N/A” in all entries above 3 GHz. CW Frequency Start Power (dBm) Stop Power (dBm) Measured Value (dB) Specification (degrees) Measurement Uncertainty (degrees) Channel A 300 kHz ≤8.0 ±0.30 50 MHz ≤8.0 ±0.30 1 GHz ≤8.0 ±0.30 1.65 GHz ≤8.0 ±0.30 2 GHz ≤8.0 ±0.30 3 GHz ≤8.
Performance Tests Performance Test Records Agilent Technologies Company Model 8753ES Option 011 Report Number Serial Number Date 15. Source and Receiver Harmonics (Option 002 only) Stop Frequency (GHz) Harmonic Specification (dBc) Measured Value Measurement Uncertainty (dB) 3 2nd < –25 ±1.5 2 3rd < –25 ±1.5 3 B: 2nd < –15 ±1.5 2 B: 3rd < –30 ±1.5 3 A: 2nd < –15 ±1.5 2 A: 3rd < –30 ±1.
Performance Tests Performance Test Records Agilent Technologies Company Model 8753ES Option 011 Report Number Serial Number Date 16. Harmonic Measurement Accuracy (Option 002 only) Note: If your analyzer does not have Option 006, write “N/A” in all entries above 3 GHz. Analyzer Frequency Ext. Source Freq. 16 MHz Power Meter Value Spec. (dB) Meas. Uncer. (dB) 32 MHz ±1.5 ±0.17 16 MHz 48 MHz ±1.5 ±0.17 31 MHz 62MHz ±1.5 ±0.17 31 MHz 93 MHz ±1.5 ±0.17 61 MHz 122 MHz ±1.5 ±0.
Performance Tests Performance Test Records 2-94 Chapter 2
3 Adjustments and Correction Constants 3-1
Adjustments and Correction Constants This chapter contains the following adjustment procedures: • A9 Switch Positions on page 3-6 • Source Default Correction Constants (Test 44) on page 3-7 • Source Pretune Default Correction Constants (Test 45) on page 3-8 • Analog Bus Correction Constants (Test 46) on page 3-9 • Source Pretune Correction Constants (Test 48) on page 3-10 • RF Output Power Correction Constants (Test 47) on page 3-11 • IF Amplifier Correction Constants (Test 51) on page 3-16 • ADC Offset Co
Adjustments and Correction Constants Post-Repair Procedures Post-Repair Procedures Table 3-1 lists the additional service procedures which you must perform to ensure that the instrument is working correctly, following the replacement of an assembly. Unless otherwise noted, these procedures can be located in either Chapter 2 , “Performance Tests,” or in this chapter, “Adjustments and Correction Constants.” Perform the procedures in the order that they are listed in the table.
Adjustments and Correction Constants Post-Repair Procedures Table 3-1 Related Service Procedures Replaced Assembly Adjustments/ Correction Constants (Chapter 3) Verification (Chapter 2) A9 CPU (EEPROM Backup Disk Not Available) — — — — — — — — — — — — Source Frequency Range and Accuracy — Source Power Range, Linearity, and Accuracy — Receiver Magnitude Dynamic Accuracy — Receiver Magnitude Frequency Response — — — — A9 Switch Positions Load Firmware Serial Number CC (Test 55) Option Number CC (Te
Adjustments and Correction Constants Post-Repair Procedures Table 3-1 Related Service Procedures Replaced Assembly Adjustments/ Correction Constants (Chapter 3) Verification (Chapter 2) A17 Motherboard None — Observation of Display — Tests 66–80 (Chapter 10) A18 Display None — Observation of Display — Tests 66–80 (Chapter 10) A19 Graphics System Processor None — Observation of Display — Tests 59–80 (Chapter 10) A20 Disk Drive None None A26 High Stability Freq Ref — Frequency Accuracy Adju
Adjustments and Correction Constants A9 Switch Positions A9 Switch Positions 1. Remove the power line cord from the analyzer. 2. Set the analyzer on its side. 3. Remove the two lower-rear corner bumpers from the bottom of the instrument with the T-10 TORX screwdriver. 4. Loosen the captive screw on the bottom cover's back edge, using a T-15 TORX screwdriver. 5. Slide the cover toward the rear of the instrument. 6.
Adjustments and Correction Constants Source Default Correction Constants (Test 44) Source Default Correction Constants (Test 44) Analyzer warmup time: 30 minutes. This internal adjustment routine writes default correction constants for the source power accuracy. 1. Press Preset YES . System SERVICE MENU TESTS 44 x1 EXECUTE TEST 2. Observe the analyzer for the results of the adjustment routine: • If the analyzer displays *Source Def DONE, you have completed this procedure.
Adjustments and Correction Constants Source Pretune Default Correction Constants (Test 45) Source Pretune Default Correction Constants (Test 45) Analyzer warmup time: 30 minutes. This adjustment writes default correction constants for rudimentary phase lock pretuning accuracy. 1. Press Preset YES . System SERVICE MENU TESTS 45 x1 EXECUTE TEST 2. Observe the analyzer for the results of this adjustment routine: • If the analyzer displays Pretune Def DONE, you have completed this procedure.
Adjustments and Correction Constants Analog Bus Correction Constants (Test 46) Analog Bus Correction Constants (Test 46) Analyzer warmup time: 30 minutes. This procedure calibrates the analog bus by using three reference voltages (ground, +0.37 and +2.5 volts), then stores the calibration data as correction constants in EEPROMs. 1. Press Preset YES . System SERVICE MENU TESTS 46 x1 EXECUTE TEST 2.
Adjustments and Correction Constants Source Pretune Correction Constants (Test 48) Source Pretune Correction Constants (Test 48) Analyzer warmup time: 30 minutes. This procedure generates pretune values for correct phase-locked loop operation. 1. Press Preset YES . System SERVICE MENU TESTS 48 x1 EXECUTE TEST 2. Observe the analyzer for the results of this adjustment routine: • If the analyzer displays Pretune Cor DONE, you have completed this procedure.
Adjustments and Correction Constants RF Output Power Correction Constants (Test 47) RF Output Power Correction Constants (Test 47) This procedure adjusts several correction constants that can improve the output power level accuracy of the internal source. They are related to the power level, power slope, power slope offset, and the ALC roll-off factors among others. Analyzer warmup time: 30 minutes.
Adjustments and Correction Constants RF Output Power Correction Constants (Test 47) Power Sensor Calibration Factor Entry 5. Zero and calibrate the power meter and power sensor. 6. Press System SERVICE MENU TEST OPTIONS LOSS/SENSR LISTS CAL FACTOR SENSOR A to access the calibration factor menu for power sensor A (HP/Agilent 8482A for a 50Ω analyzer, or HP/Agilent 8483A Option H03 for a 75Ω analyzer). 7. Build a table of up to 55 points (55 frequencies with their calibration factors).
Adjustments and Correction Constants RF Output Power Correction Constants (Test 47) Figure 3-2 Setup A for RF Output Correction Constants 10.Press Sweep Setup CW FREQ 300 k/m . 11.Record the power meter reading in the first column of Table 3-2. Table 3-2 Power Meter Readings Setup A Reading (First Reading) Setup B Reading (Second Reading) Power Loss of #2 (Enter in Analyzer) 300 kHz: _______dB minus _______dB equals _______dB 50 MHz: _______dB minus _______dB equals _______dB 1.
Adjustments and Correction Constants RF Output Power Correction Constants (Test 47) 15.For Option 006 Instruments Only: Use the 8482A (sensor A) in the equipment configuration. • If you are using the 438A power meter, the 8482A should be connected to the meter's channel A input. • If you are using the 437B power meter, zero and calibrate the 8482A sensor. Figure 3-3 Setup B for RF Output Correction Constants 16.Repeat the measurements at the same frequencies (300 kHz, 50 MHz, 1.
Adjustments and Correction Constants RF Output Power Correction Constants (Test 47) Source Correction Routine 20.Press DONE RETURN PWR LOSS ON to turn power loss ON. 21.Press RETURN TESTS 47 x1 EXECUTE TEST YES . 22.Connect the equipment as shown in Figure 3-4, using splitter #2 and the power sensor requested by the prompt. Figure 3-4 Setup C for RF Output Correction Constants 23.Press CONTINUE . 24.
Adjustments and Correction Constants IF Amplifier Correction Constants (Test 51) IF Amplifier Correction Constants (Test 51) This adjustment routine measures the gain of the IF amplifiers (A and B only) located on the A10 digital IF, to determine the correction constants for absolute amplitude accuracy. Analyzer warmup time: 30 minutes.
Adjustments and Correction Constants IF Amplifier Correction Constants (Test 51) 4. Press CONTINUE and observe the analyzer for the results of the adjustment routine: • If DONE is displayed, you have completed this procedure. • If FAIL is displayed, check that the RF cable is connected between Port 1 and Port 2. Then, repeat this adjustment routine. • If the analyzer continues to fail the adjustment routine, refer to Chapter 6 , “Digital Control Troubleshooting.
Adjustments and Correction Constants ADC Offset Correction Constants (Test 52) ADC Offset Correction Constants (Test 52) Analyzer warmup time: 30 minutes. These correction constants improve the dynamic accuracy by shifting small signals to the most linear part of the ADC quantizing curve. 1. Press Preset YES . NOTE System SERVICE MENU TESTS 52 x1 EXECUTE TEST This routine takes about three minutes. 2.
Adjustments and Correction Constants Sampler Magnitude and Phase Correction Constants (Test 53) Sampler Magnitude and Phase Correction Constants (Test 53) This adjustment procedure corrects the overall flatness of the microwave components that make up the analyzer receiver and signal separation sections. This is necessary for the analyzer to meet the published test port flatness specification. Analyzer warmup time: 30 minutes.
Adjustments and Correction Constants Sampler Magnitude and Phase Correction Constants (Test 53) Power Sensor Calibration Factor Entry 5. Press System SERVICE MENU TEST OPTIONS LOSS/SENSR LISTS CAL FACTOR SENSOR A to access the calibration factor menu for power sensor A. 6. Build a table of up to 55 points (55 frequencies with their calibration factors). To enter each point, follow these steps: a. Press ADD FREQUENCY . b. Input a frequency value and then press the appropriate key ( G/n , M/µ , or k/m ).
Adjustments and Correction Constants Sampler Magnitude and Phase Correction Constants (Test 53) Figure 3-6 Input R Sampler Correction Setup 12.Press CONTINUE . The analyzer starts the first part of the automatic adjustment. This part will take about seven minutes. 13.For Option 006 Instruments Only: After the analyzer has finished the first part of the adjustment, disconnect the 8482A (sensor A) from the power splitter, and replace it with the 8481A (sensor B) for the 6 GHz measurement.
Adjustments and Correction Constants Sampler Magnitude and Phase Correction Constants (Test 53) Figure 3-7 Input A Sampler Correction Setup 16.Press CONTINUE . The analyzer starts the second part of the automatic adjustment. 17.Follow the analyzer prompt to move the cable from input A to input B, as shown in Figure 3-8. Figure 3-8 Input B Sampler Correction Setup 18.Press CONTINUE . The analyzer starts the third part of the automatic adjustment. 19.
Adjustments and Correction Constants Sampler Magnitude and Phase Correction Constants (Test 53) Sampler Offset Adjustment 1. Connect the equipment as shown in Figure 3-9. The setup is configured to test the R and B samplers. To test the A sampler, disconnect the cable from the B input and connect it to the A input. Figure 3-9 Sampler Offset Test 2. Press Preset Start 3. Press Power 6 4. Press Meas 100 k/m . x1 . INPUT PORTS (specific sampler A, B, or R). 5. Press System CONFIGURE MENU 6.
Adjustments and Correction Constants Sampler Magnitude and Phase Correction Constants (Test 53) 9. Update the offsets for each sampler: A-Channel Sampler a. Access the first address by pressing System PEEK/POKE ADDRESS 1619001372 SERVICE MENU PEEK/POKE x1 . b. Enter the new value for the A-sampler at the accessed address by pressing POKE [new value for A] x1 . c. Press Preset for the analyzer to use the new values. B-Channel Sampler a.
Adjustments and Correction Constants Cavity Oscillator Frequency Correction Constants (Test 54) Cavity Oscillator Frequency Correction Constants (Test 54) The nominal frequency of the cavity oscillator is 2.982 GHz, but it varies with temperature. This procedure determines the precise frequency of the cavity oscillator at a particular temperature by identifying a known spur. Analyzer warmup time: 30 minutes.
Adjustments and Correction Constants Cavity Oscillator Frequency Correction Constants (Test 54) Procedure 1. Connect the equipment shown in Figure 3-10. Figure 3-10 Setup for Cavity Oscillator Frequency Correction Constant Routine 2. Press Preset x1 Avg IF BW EXECUTE TEST 3000 x1 System SERVICE MENU TESTS 54 YES .
Adjustments and Correction Constants Cavity Oscillator Frequency Correction Constants (Test 54) 4. Press NEXT repeatedly. Watch the trace on each sweep and try to spot the target spur. With the filter, the target spur will be one of two obvious spurs (see Figure 3-11). Without the filter (not recommended), the target spur will be one of four or five less distinct spurs as shown in Figure 3-12 and Figure 3-13. When the center frequency increases to 2994.
Adjustments and Correction Constants Cavity Oscillator Frequency Correction Constants (Test 54) Spurs Search Procedure without a Filter 8. Press EXECUTE TEST YES CONTINUE and the other softkeys as required to observe and mark the target spur. 9. The target spur will appear in many variations. Often it will be difficult to identify positively; occasionally it will be nearly impossible to identify. Do not hesitate to press CONTINUE as many times as necessary to thoroughly inspect the current span.
Adjustments and Correction Constants Cavity Oscillator Frequency Correction Constants (Test 54) Figure 3-13 Target Spur Is Fourth in Display of Five Spurs Figure 3-14 shows another variation of the basic four-spur pattern: some up, some down, and the target spur itself almost indistinguishable. Figure 3-14 Target Spur Is Almost Invisible 10.Rotate the front panel knob to position the marker on the target spur.
Adjustments and Correction Constants Serial Number Correction Constants (Test 55) Serial Number Correction Constants (Test 55) Analyzer warmup time: 5 minutes. This procedure stores the analyzer serial number in the A9 CPU assembly EEPROMs. CAUTION Perform this procedure only if the A9 CPU assembly has been replaced. 1. Record the ten character serial number that is on the analyzer’s rear panel identification label. 2. Press Preset logo. DISPLAY MORE TITLE ERASE TITLE to erase the HP/Agilent 3.
Adjustments and Correction Constants Option Numbers Correction Constants (Test 56) Option Numbers Correction Constants (Test 56) This procedure stores instrument option(s) information in A9 CPU assembly EEPROMs. You can also use this procedure to remove a serial number, with the unique keyword, as referred to in “Serial Number Correction Constants (Test 55)” on page 3-30. 1. Remove the instrument top cover and record the keyword label(s) that are on the display assembly.
Adjustments and Correction Constants Initialize EEPROMs (Test 58) Initialize EEPROMs (Test 58) This service internal test performs the following functions: • Destroys all correction constants and all unprotected options. • Initializes certain EEPROM address locations to zeroes. NOTE This routine will not alter the serial number or Options 002, 006 and 010 correction constants. 1. Make sure the A9 switch is in the alter position. 2. Press Preset YES . System SERVICE MENU TESTS 58 x1 EXECUTE TEST 3.
Adjustments and Correction Constants EEPROM Backup Disk Procedure EEPROM Backup Disk Procedure The correction constants, which are unique to your instrument, are stored in EEPROM on the A9 controller assembly. By creating an EEPROM backup disk, you will have a copy of all the correction constant data should you need to replace or repair the A9 assembly. Required Equipment and Tools Description HP/Agilent Part or Model Number 3.5-inch Floppy Disk One formatted 1.
Adjustments and Correction Constants Correction Constants Retrieval Procedure Correction Constants Retrieval Procedure Required Equipment and Tools Description HP/Agilent Part Number EEPROM backup disk Antistatic wrist strap 9300-1367 Antistatic wrist strap cord 9300-0980 Static-control table mat and earth ground wire 9300-0797 By using the current EEPROM backup disk, you can download the correction constants data into the instrument EEPROMs. 1.
Adjustments and Correction Constants Loading Firmware Loading Firmware The following procedures will load firmware for new or existing CPU boards in your network analyzer. Analyzer warmup time: None required. Required Equipment and Tools Firmware disk for the 8753ES Loading Firmware into an Existing CPU Use this procedure for upgrading firmware in an operational instrument whose CPU board has not been changed. CAUTION Loading firmware will clear all internal memory.
Adjustments and Correction Constants Loading Firmware In Case of Difficulty If the firmware did not load successfully, LED patterns on the front panel can help you isolate the problem. • If the following LED pattern is present, an acceptable firmware file name was not found on the disk. (The desired format for firmware filenames is 8753ES.07._yz, where yz = the latest firmware revision number.) Check that the firmware disk used was for the 8753ES.
Adjustments and Correction Constants Loading Firmware Loading Firmware into a New CPU Use this procedure to load firmware for an instrument whose CPU board has been replaced. 1. Turn off the network analyzer. 2. Insert the firmware disk into the instrument's disk drive. 3. Turn the instrument on. The firmware will be loaded automatically during power-on. The front panel LEDs should step through a sequence as firmware is loaded. The display will be blank during this time.
Adjustments and Correction Constants Loading Firmware — If any of the following LED patterns are present, the firmware disk may be defective. LED Pattern CH1 CH2 R L T S ✲ ✲ ✲ ✲ ✲ ✲ ✲ ✲ ✲ ✲ ✲ ✲ ✲ ✲ ✲ ✲ ✲ ✲ ✲ ✲ ✲ ✲ ✲ ✲ ✲ ✲ ✲ ✲ ✲ — If any other LED pattern is present, the CPU board is defective. NOTE If firmware did not load, a red LED on the CPU board will be flashing.
Adjustments and Correction Constants Fractional-N Frequency Range Adjustment Fractional-N Frequency Range Adjustment This procedure centers the fractional-N VCO (voltage controlled oscillator) in its tuning range to insure reliable operation of the instrument.
Adjustments and Correction Constants Fractional-N Frequency Range Adjustment Figure 3-15 Location of the FN VCO TUNE Adjustment Figure 3-16 Fractional-N Frequency Range Adjustment Display 9. Press Meas MORE 3-40 S PARAMETERS ANALOG IN Aux Input REAL Scale Ref REFERENCE VALUE 7 29 x1 Marker Format x1 .
Adjustments and Correction Constants Fractional-N Frequency Range Adjustment 10.Observe the analyzer for the results of this adjustment: • If the marker value is less than 7, you have completed this procedure. • If the marker value is greater than 7, readjust “FN VCO ADJ” to 7. Then perform steps 2 to 10 to confirm that the channel 1 and channel 2 markers are still above and below the reference line respectively. • If you cannot adjust the analyzer correctly, replace the A14 board assembly.
Adjustments and Correction Constants Frequency Accuracy Adjustment Frequency Accuracy Adjustment This adjustment sets the VCXO (voltage controlled crystal oscillator) frequency to maintain the instrument's frequency accuracy. Analyzer warmup time: 30 minutes.
Adjustments and Correction Constants Frequency Accuracy Adjustment NOTE Make sure that the spectrum analyzer and network analyzer references are not connected. 3. For Option 1D5 Instruments Only: Remove the BNC-to-BNC jumper that is connected between the “EXT REF” and the “10 MHz Precision Reference,” as shown in Figure 3-19. 4.
Adjustments and Correction Constants Frequency Accuracy Adjustment NOTE To increase the accuracy of this adjustment, the following steps are recommended. 8. Replace the instrument covers and wait 15 minutes in order to allow the analyzer to reach its precise operating temperature. 9. Recheck the CW frequency and adjust if necessary. Instruments with Option 1D5 Only 10.Reconnect the BNC-to-BNC jumper between the “EXT REF” and the “10 MHz Precision Reference” as shown in Figure 3-19.
Adjustments and Correction Constants High/Low Band Transition Adjustment High/Low Band Transition Adjustment This adjustment centers the VCO (voltage controlled oscillator) of the A12 reference assembly for high and low band operations. Analyzer warmup time: 30 minutes.
Adjustments and Correction Constants High/Low Band Transition Adjustment Figure 3-20 High/Low Band Transition Adjustment Trace Figure 3-21 High/Low Band Adjustment Locations 3-46 Chapter 3
Adjustments and Correction Constants Fractional-N Spur Avoidance and FM Sideband Adjustment Fractional-N Spur Avoidance and FM Sideband Adjustment This adjustment minimizes the spurs caused by the API (analog phase interpolator, on the fractional-N assembly) circuits. It also improves the sideband characteristics. Analyzer warmup time: 30 minutes.
Adjustments and Correction Constants Fractional-N Spur Avoidance and FM Sideband Adjustment Figure 3-22 Fractional-N Spur Avoidance and FM Sideband Adjustment Setup 3. Set the spectrum analyzer measurement parameters as follows: Reference Level 0 dBm Resolution Bandwidth 100 Hz Center Frequency 676.145105 MHz Span 2.5 kHz 4. On the network analyzer, press Preset CW FREQ 676.045105 M/µ . Avg IF BW 3000 x1 Sweep Setup 5.
Adjustments and Correction Constants Fractional-N Spur Avoidance and FM Sideband Adjustment Figure 3-23 Location of API and 100 kHz Adjustments 7. On the spectrum analyzer, set the center frequency for 676.051105 MHz. 8. On the analyzer, press Sweep Setup CW FREQ 676.048105 M/µ . 9. Adjust the API1 (R35) for a null (minimum amplitude) on the spectrum analyzer. 10.On the spectrum analyzer, set the center frequency for 676.007515 MHz. 11.On the analyzer, press Sweep Setup CW FREQ 676.004515 M/µ .
Adjustments and Correction Constants Source Spur Avoidance Tracking Adjustment Source Spur Avoidance Tracking Adjustment This adjustment optimizes tracking between the YO (YIG oscillator) and the cavity oscillator when they are frequency offset to avoid spurs. Optimizing YO-cavity oscillator tracking reduces potential phase-locked loop problems. Analyzer warmup time: 30 minutes.
Adjustments and Correction Constants Source Spur Avoidance Tracking Adjustment 4. Press System SERVICE MENU ANALOG IN Aux Input 5. Press Format MORE 11 REAL ANALOG BUS ON Meas S PARAMETERS x1 . Scale Ref 10 k/m MARKER→REFERENCE . 6. To make sure that you have connected the test points properly, adjust the CAV ADJ potentiometer while observing the analyzer display. You should notice a change in voltage. 7.
Adjustments and Correction Constants Unprotected Hardware Option Numbers Correction Constants Unprotected Hardware Option Numbers Correction Constants Analyzer warmup time: None. This procedure stores the instrument's unprotected option(s) information in A9 CPU assembly EEPROMs. 1. Make sure the A9 switch is in the Alter position. 2. Record the installed options that are printed on the rear panel of the analyzer. 3. Press System SERVICE MENU PEEK/POKE PEEK/POKE ADDRESS . 4.
Adjustments and Correction Constants Sequences for Mechanical Adjustments Sequences for Mechanical Adjustments The network analyzer has the capability of automating tasks through a sequencing function. The following adjustment sequences are available from the Agilent Technologies web site on the World Wide Web.
Adjustments and Correction Constants Sequences for Mechanical Adjustments How to Set Up the High/Low Band Transition Adjustments 1. Press Preset SEQ X HBLBADJ (where X is the sequence number). 2. Observe the VCO tuning trace: • If the left half of trace = 0 ± 1000 mV and right half of trace = 100 to 200 mV higher (one to two divisions): no adjustment is necessary. • If the adjustment is necessary, follow these steps: a. Remove the upper-rear bumpers and top cover, using a TORX screwdriver. b.
Adjustments and Correction Constants Sequences for Mechanical Adjustments Sequences for the Fractional-N Frequency Range Adjustment — Sequence FNADJ sets up A14 (FRAC N Digital) VCO. — DISPLAY DUAL CHAN ON SYSTEM SERVICE MENU ANALOG BUS ON SWEEP SETUP NUMBER OF POINTS 11 x1 COUPLED CHAN OFF START 36 M/u STOP 60.75 M/u SWEEP SETUP SWEEP TIME 12.5 k/m MEAS ANALOG IN 29 x1 (FN VCO TUN) SCALE/REF 0.6 x1 REF VALUE −7 x1 MKR CH 2 SWEEP SETUP CW FREQ 31.0001 M/u SWEEP TIME 12.
Adjustments and Correction Constants Sequences for Mechanical Adjustments Sequences for the Fractional-N Avoidance and FM Sideband Adjustment — Sequence APIADJ sets up the fractional-N API spur adjustments. — TITLE SP 2.5K PERIPHERAL HPIB ADDR 18 x1 TITLE TO PERIPHERAL WAIT x 0 x1 TITLE AT 0DB TITLE TO PERIPHERAL WAIT x 0 x1 TITLE RB 100HZ TITLE TO PERIPHERAL WAIT x 0 x1 TITLE CF 676.145105MZ TITLE TO PERIPHERAL WAIT x 0 x1 CW FREQ 676.045105M/u TITLE ADJ A13 100KHZ SEQUENCE PAUSE TITLE CF 676.
Adjustments and Correction Constants Sequences for Mechanical Adjustments TITLE CF 676.007515MZ TITLE TO PERIPHERAL WAIT x 0 x1 CW FREQ 676.004515M/u TITLE ADJ A13 API2 SEQUENCE PAUSE TITLE CF 676.003450MZ TITLE TO PERIPHERAL WAIT x 0 x1 CW FREQ 676.000450M/u TITLE ADJ A13 API3 SEQUENCE PAUSE TITLE CF 676.003045MZ TITLE TO PERIPHERAL WAIT x 0 x1 CW FREQ 676.
Adjustments and Correction Constants Sequences for Mechanical Adjustments 3-58 Chapter 3
4 Start Troubleshooting Here 4-1
Start Troubleshooting Here Start Troubleshooting Here Start Troubleshooting Here The information in this chapter helps you: • Identify the portion of the analyzer that is at fault. • Locate the specific troubleshooting procedures to identify the assembly or peripheral at fault. To identify the portion of the analyzer at fault, follow these procedures: Step 1. Initial Observations on page 4-5 Step 2. Operator's Check on page 4-6 Step 3. GPIB Systems Check on page 4-8 Step 4.
Start Troubleshooting Here Assembly Replacement Sequence Assembly Replacement Sequence The following steps show the sequence to replace an assembly in the analyzer. 1. Identify the faulty group by following the procedures in this chapter. Follow up with the appropriate troubleshooting chapter that identifies the faulty assembly. 2. Order a replacement assembly. Refer to Chapter 13 , “Replaceable Parts.” 3. Replace the faulty assembly and determine what adjustments are necessary.
Start Troubleshooting Here Having Your Analyzer Serviced Having Your Analyzer Serviced If the analyzer should fail any of the following checks, call the nearest Agilent Technologies sales or service office to determine the warranty on your instrument, and whether repair will be on-site, or return to Agilent Technologies. If the analyzer needs to be returned to Agilent Technologies, perform the following steps. 1. Choose the nearest Agilent Technologies service center.
Start Troubleshooting Here Step 1. Initial Observations Step 1. Initial Observations Initiate the Analyzer Self-Test 1. Disconnect all devices and peripherals from the analyzer (including all test set interconnects). 2. Switch on the analyzer and press Preset . 3. Watch for the indications shown in Figure 4-1 to determine if the analyzer is operating correctly. Figure 4-1 Preset Sequence • If the self-test failed, refer to “Step 4. Faulty Group Isolation” on page 4-10.
Start Troubleshooting Here Step 2. Operator's Check Step 2. Operator's Check The operator's check determines that: • The source is phase locked across the entire frequency range. • All three samplers are functioning properly. Analyzer warm-up time: 30 minutes. Required Equipment Description HP/Agilent Model Number Power splitter 11667A Option 001 Attenuator 20 dB 8491A Option 020 RF cable set 11851B Procedure 1.
Start Troubleshooting Here Step 2. Operator's Check 4. Press 22 x1 to access the input R and B operator’s check. When the title appears, press EXECUTE TEST . Move the RF cable from input A to B. Press CONTINUE , as prompted, until the analyzer displays “PASS” or “FAIL.” If the Operator’s Check Failed • Recheck the equipment configuration and connections; if necessary, retest. • Confirm that the attenuator, splitter and cables meet their published specifications. Visually inspect the connectors.
Start Troubleshooting Here Step 3. GPIB Systems Check Step 3. GPIB Systems Check Check the analyzer's GPIB functions with a known working passive peripheral (such as a plotter, printer, or disk drive). 1. Connect the peripheral to the analyzer using a good GPIB cable. 2. Press Local peripheral. SYSTEM CONTROLLER to enable the analyzer to control the 3. Then press SET ADDRESSES and the appropriate softkeys to verify that the device addresses will be recognized by the analyzer.
Start Troubleshooting Here Step 3. GPIB Systems Check • If the result is not a copy of the analyzer display, suspect the GPIB function of the analyzer. Refer to Chapter 6 , “Digital Control Troubleshooting.” If Using an External Disk Drive 1. Select the external disk drive. Press Save/Recall SELECT DISK 2. Verify that the address is set correctly. Press Local ADDRESS:DISK . EXTERNAL DISK . SET ADDRESSES 3. Ensure that the disk drive is set up correctly: • Power is on.
Start Troubleshooting Here Step 4. Faulty Group Isolation Step 4. Faulty Group Isolation Use the following procedures only if you have read the previous sections in this chapter and you think the problem is in the analyzer. These are simple procedures to verify the four functional groups in sequence, and determine which group is faulty. The four functional groups are: • power supplies • digital control • source • receiver Descriptions of these groups are provided in Chapter 12 , “Theory of Operation.
Start Troubleshooting Here Power Supply Power Supply Check the Rear Panel LEDs Switch on the analyzer. Notice the condition of the two LEDs on the A15 preregulator at rear of the analyzer. (See Figure 4-4.) • The upper (red) LED should be off. • The lower (green) LED should be on. Figure 4-4 A15 Preregulator LEDs Check the A8 Post Regulator LEDs Remove the analyzer's top cover. Switch on the power. Inspect the green LEDs along the top edge of the A8 post-regulator assembly. • All green LEDs should be on.
Start Troubleshooting Here Digital Control Digital Control Observe the Power Up Sequence Switch the analyzer power off, then on. The following should take place within a few seconds: • On the front panel, observe the following: 1. All six amber LEDs illuminate. 2. The amber LEDs go off after a few seconds, except the CH1 LED. See Figure 4-5. • The display should come up bright with no irregularity in colors. • After an initial pattern, five red LEDs on the A9 CPU board should remain off.
Start Troubleshooting Here Digital Control Verify Internal Tests Passed 1. Press Preset System SERVICE MENU TESTS EXECUTE TEST . The display should indicate: INTERNAL TESTS TEST 0 ALL INT PASS • If your display shows the above message, go to step 2. Otherwise, continue with this step. • If phase lock error messages are present, this test may stop without passing or failing. In this case, continue with the next procedure to check the source.
Start Troubleshooting Here Source Source Phase Lock Error Messages The error messages listed below are usually indicative of a source failure or improper instrument configuration. (Ensure that the R channel input is receiving at least −35 dBm power.) Continue with this procedure. • NO IF FOUND: CHECK R INPUT LEVEL The first IF was not detected during the pretune stage of phase lock.
Start Troubleshooting Here Source Figure 4-6 Equipment Setup for Source Power Check 2. Zero and calibrate the power meter. Press Preset instrument. on the analyzer to initialize the 3. On the analyzer, press Sweep Setup CW FREQ 300 k/m to output a CW 300 kHz signal. The power meter should read approximately 0 dBm. 4. Press 16 M/µ to change the CW frequency to 16 MHz. The output power should remain approximately 0 dBm throughout the analyzer frequency range. Repeat this step at 1 and 3 GHz.
Start Troubleshooting Here Source Figure 4-7 ABUS Node 16: 1 V/GHz If any of the above procedures provide unexpected results, or if error messages are present, refer to Chapter 7 , “Source Troubleshooting.
Start Troubleshooting Here Receiver Receiver Observe the A and B Input Traces 1. Connect the equipment as shown in Figure 4-8 below. Be sure that any special accessories, such as limiters, have been disconnected. Figure 4-8 Equipment Setup 2. Press Preset Meas R Scale Ref MARKER→ REFERENCE . AUTO SCALE Marker Fctn 3. Observe the measurement trace displayed by the R input. The trace should have about the same flatness as the trace in Figure 4-9.
Start Troubleshooting Here Receiver Figure 4-9 Typical Measurement Trace If the source is working, but the R, A, or B input traces appear to be in error, refer to Chapter 8 , “Receiver Troubleshooting.” The following symptoms may also indicate receiver failure.
Start Troubleshooting Here Accessories Accessories If the analyzer has passed all of the previous checks but is still making incorrect measurements, suspect the system accessories. Accessories such as RF or interconnect cables, calibration or verification kit devices, limiters, adapters, and test sets can all induce system problems. Reconfigure the system as it is normally used and reconfirm the problem. Continue with Chapter 9 , “Accessories Troubleshooting.
Start Troubleshooting Here Accessories 4-20 Chapter 4
Start Troubleshooting Here Accessories 4-22 Chapter 4
5 Power Supply Troubleshooting 5-1
Power Supply Troubleshooting Power Supply Troubleshooting Power Supply Troubleshooting Use this procedure only if you have read Chapter 4 , “Start Troubleshooting Here.” Follow the procedures in the order given, unless: • an error message appears on the display; refer to “Error Messages” on page 5-17. • the fan is not working; refer to “Fan Troubleshooting” on page 5-19.
Power Supply Troubleshooting Assembly Replacement Sequence Assembly Replacement Sequence The following steps show the sequence to replace an assembly in the analyzer. 1. Identify the faulty group. Refer to Chapter 4 , “Start Troubleshooting Here.” Follow up with the appropriate troubleshooting chapter that identifies the faulty assembly. 2. Order a replacement assembly. Refer to Chapter 13 , “Replaceable Parts.” 3. Replace the faulty assembly and determine what adjustments are necessary.
Power Supply Troubleshooting Simplified Block Diagram Simplified Block Diagram Figure 5-1 shows the power supply group in simplified block diagram form. Refer to the detailed block diagram of the power supply located at the end of this chapter to see voltage lines and specific connector pin numbers.
Power Supply Troubleshooting Start Here Start Here Check the Green LED and Red LED on A15 Switch on the analyzer and look at the rear panel of the analyzer. Check the two power supply diagnostic LEDs on the A15 preregulator casting by looking through the holes located to the left of the line voltage selector switch. (See Figure 5-2.) During normal operation, the bottom (green) LED is on and the top (red) LED is off. If these LEDs are normal, then A15 is 95% verified.
Power Supply Troubleshooting Start Here Measure the Post Regulator Voltages Measure the DC voltages on the test points of A8 with a voltmeter. Refer to Figure 5-3 for test point locations and Table 5-3 for supply voltages and limits. Figure 5-3 A8 Post Regulator Test Point Locations Table 5-1. A8 Post Regulator Test Point Voltages TP Supply Range 1 +65 V (not used) +64.6 to +65.4 2 AGND n/a 3 +5 VD +4.9 to +5.3 4 SDIS n/a 5 −15 V −14.4 to −15.6 6 −12.6 VPP (probe power) −12.1 to −12.
Power Supply Troubleshooting If the Green LED of the A15 Is Not ON Steadily If the Green LED of the A15 Is Not ON Steadily If the green LED is not on steadily, the line voltage is not enough to power the analyzer. Check the Line Voltage, Selector Switch, and Fuse Check the main power line cord, line fuse, line selector switch setting, and actual line voltage to see that they are all correct. Figure 5-4 shows how to remove the line fuse, using a small flat-blade screwdriver to pry out the fuse holder.
Power Supply Troubleshooting If the Red LED of the A15 Is ON If the Red LED of the A15 Is ON If the red LED is on or flashing, the power supply is shutting down. Use the following procedures to determine which assembly is causing the problem. Check the A8 Post Regulator 1. Switch off the analyzer. 2. Disconnect the cable A15W1 from the A8 post regulator. (See Figure 5-5.) 3. Switch on the analyzer and observe the red LED on A15. • If the red LED goes out, the problem is probably the A8 post regulator.
Power Supply Troubleshooting If the Red LED of the A15 Is ON Figure 5-5 Chapter 5 Power Supply Cable Locations 5-9
Power Supply Troubleshooting If the Red LED of the A15 Is ON Verify the A15 Preregulator Verify that the A15 preregulator is supplying the correct voltages to the A8 post regulator. Use a voltmeter with a small probe to measure the output voltages of A15W1's plug. Refer to Table 5-2 and Figure 5-6. • If the voltages are not within tolerance, replace A15. • If the voltages are within tolerance, A15 is verified. Continue to “Check for a Faulty Assembly” on page 5-11.
Power Supply Troubleshooting If the Red LED of the A15 Is ON Figure 5-6 A15W1 Plug Detail Check for a Faulty Assembly This procedure checks for a faulty assembly that might be shutting down the A15 preregulator via one of the following lines (also refer to Figure 5-1): • A15W1 connecting to the A8 post regulator • the +5VCPU line through the motherboard • the +5VDIG line through the motherboard Do the following: 1. Switch off the analyzer. 2. Ensure that A15W1 is reconnected to A8. (Refer to Figure 5-5.
Power Supply Troubleshooting If the Red LED of the A15 Is ON • If the red LED goes out, the particular assembly (or one receiving power from it) that allows it to go out is faulty. • If the red LED is still on after you have checked all of the assemblies listed in Table 5-3, continue to “Check the Operating Temperature” on page 5-12. Table 5-3 Recommended Order for Removal/Disconnection Assembly To Remove Removal or Disconnection Method Other Assemblies that Receive Power from the Removed Assembly 1.
Power Supply Troubleshooting If the Green LEDs of the A8 Are Not All ON If the Green LEDs of the A8 Are Not All ON The green LEDs along the top edge of the A8 post regulator are normally on. Flashing LEDs on A8 indicate that the shutdown circuitry on the A8 post regulator is protecting power supplies from overcurrent conditions by repeatedly shutting them down. This may be caused by supply loading on A8 or on any other assembly in the analyzer. Remove A8, Maintain A15W1 Cable Connection 1.
Power Supply Troubleshooting If the Green LEDs of the A8 Are Not All ON Remove the Assemblies 1. Switch off the analyzer. 2. Install A8. Remove the jumper from A8TP2 (AGND) to chassis ground. 3. Remove or disconnect all the assemblies listed below. (See Figure 5-5 on page 5-9.) Always switch off the analyzer before removing or disconnecting an assembly. A9 CPU A10 digital IF A11 phase lock A12 reference A13 fractional-N analog A14 fractional-N digital A19 graphics processor 4.
Power Supply Troubleshooting If the Green LEDs of the A8 Are Not All ON Briefly Disable the Shutdown Circuitry In this step, you shutdown the protective circuitry for a short time, and the supplies are forced on (including shorted supplies) with a 100% duty cycle. Damage to components or to circuit traces may occur if A8TP4 (SDIS) is shorted to chassis ground for more than a few seconds while supplies are shorted. CAUTION 1. Switch off the analyzer. 2.
Power Supply Troubleshooting If the Green LEDs of the A8 Are Not All ON light is faulty. • If the LEDs are still not on steadily, continue to “Inspect the Motherboard” on page 5-16. Table 5-4 Recommended Order for Removal/Disconnection Assembly To Remove Removal or Disconnection Method Other Assemblies that Receive Power from the Removed Assembly 1. A3 Source Remove from Card Cage None 2. A7 Pulse Generator Remove from Card Cage None 3. A4 R Sampler Remove from Card Cage None 4.
Power Supply Troubleshooting Error Messages Error Messages Three error messages are associated with the power supplies functional group. They are shown here. • POWER SUPPLY SHUT DOWN! One or more supplies on the A8 post regulator assembly is shut down due to one of the following conditions: overcurrent, overvoltage, or undervoltage. Refer to “If the Red LED of the A15 Is ON” on page 5-8. • POWER SUPPLY HOT The temperature sensors on the A8 post regulator assembly detect an overtemperature condition.
Power Supply Troubleshooting Error Messages • If the correct voltages are present, troubleshoot the probe. • If the voltages are not present, check the +15 V and −12.6 V green LEDs on A8. — If the LEDs are on, there is an open between the A8 assembly and the front panel probe power connectors. Put A8 onto an extender board and measure the voltages at the following pins: A8P2 pins 6 and 36 −12.6 volts A8P2 pins 4 and 34 +15 volts — If the LEDs are off, continue with “Check the Fuses and Isolate A8.
Power Supply Troubleshooting Fan Troubleshooting Fan Troubleshooting Fan Speeds The fan speed varies depending upon temperature. It is normal for the fan to be at high speed when the analyzer is just switched on, and then change to low speed when the analyzer is cooled. Check the Fan Voltages If the fan is dead, refer to the A8 post regulator block diagram at the end of this chapter. The fan is driven by the +18 V and −18 V supplies coming from the A15 preregulator. Neither of these supplies is fused.
Power Supply Troubleshooting Intermittent Problems Intermittent Problems Preset states that appear spontaneously (without pressing Preset ) typically signal a power supply or A9 CPU problem. Since the A9 CPU assembly is the easiest to substitute, do so. If the problem ceases, replace the A9. If the problem continues, replace the A15 preregulator assembly.
Power Supply Troubleshooting Intermittent Problems 5-22 Chapter 5
6 Digital Control Troubleshooting 6-1
Digital Control Troubleshooting Digital Control Troubleshooting Digital Control Troubleshooting Use this procedure only if you have read Chapter 4 , “Start Troubleshooting Here.” The digital control group assemblies consist of the following: • CPU — A9 • Display — A2, A18, A19, A27 • Front Panel — A1, A2 • Digital IF — A10 • Rear Panel Interface — A16 Begin with “CPU Troubleshooting (A9)” on page 6-5, then proceed to the assembly that you suspect has a problem.
Digital Control Troubleshooting Digital Control Group Block Diagram Digital Control Group Block Diagram Figure 6-1 Chapter 6 Digital Control Group Block Diagram 6-3
Digital Control Troubleshooting Assembly Replacement Sequence Assembly Replacement Sequence The following steps show the sequence to replace an assembly in the analyzer. 1. Identify the faulty group. Refer to Chapter 4 , “Start Troubleshooting Here.” Follow up with the appropriate troubleshooting chapter that identifies the faulty assembly. 2. Order a replacement assembly. Refer to Chapter 13 , “Replaceable Parts.” 3. Replace the faulty assembly and determine what adjustments are necessary.
Digital Control Troubleshooting CPU Troubleshooting (A9) CPU Troubleshooting (A9) A9 CC Switch Positions The A9 CC switch must be in the NORMAL position for these procedures. This is the position for normal operating conditions. To move the switch to the NORMAL position, do the following: 1. Remove the power line cord from the analyzer. 2. Set the analyzer on its side. 3. Remove the two corner bumpers from the bottom of the instrument with a T-15 TORX screwdriver. 4.
Digital Control Troubleshooting CPU Troubleshooting (A9) Checking A9 CPU Red LED Patterns The A9 CPU has five red LEDs that can be viewed through a small opening in the rear panel of the analyzer. (See Figure 6-3.) Four LEDs are easily viewable. The fifth LED must be viewed by looking to the left at an angle. 1. Cycle the power while observing five red LEDs Cycle the power on the analyzer and observe the five red LEDs. After an initial pattern, the five red LEDs on the A9 CPU board should remain off.
Digital Control Troubleshooting Display Troubleshooting (A2, A18, A19, A27) Display Troubleshooting (A2, A18, A19, A27) This section contains the following information: • Evaluating Your Display, on page 6-7 • Troubleshooting a White Display, on page 6-10 • Troubleshooting a Black Display, on page 6-10 • Troubleshooting a Display with Color Problems, on page 6-11 Evaluating Your Display Switch the analyzer off, and then on. The display should be bright with the annotation legible and intelligible.
Digital Control Troubleshooting Display Troubleshooting (A2, A18, A19, A27) NOTE This procedure should be performed with a photometer and only by qualified personnel. 1. Press Display MORE ADJUST DISPLAY INTENSITY display intensity at 100%. 2. Press System SERVICE MENU TESTS 62 to set a white screen test pattern on the display. x1 100 x1 to set the EXECUTE TEST CONTINUE 3. Set the photometer probe to NORMAL. Turn on power to the photometer and allow 30 minutes of warm-up time.
Digital Control Troubleshooting Display Troubleshooting (A2, A18, A19, A27) Red, Green, or Blue Pixels Specifications Red, green, or blue “stuck on” pixels may appear against a black background. To test for these dots, press System SERVICE MENU TESTS 70 x1 EXECUTE TEST CONTINUE .
Digital Control Troubleshooting Display Troubleshooting (A2, A18, A19, A27) Figure 6-5 Newtons Rings Troubleshooting a White Display If the display is white, the A27 back light inverter is functioning properly. Connect a VGA monitor to the analyzer. • If the image on the external monitor is normal, then suspect A2, A18, or the front panel cabling. • If the image on the external monitor is bad, suspect the A19 GSP or cable W20 (CPU to motherboard). Troubleshooting a Black Display 1.
Digital Control Troubleshooting Display Troubleshooting (A2, A18, A19, A27) Troubleshooting a Display with Color Problems 1. Press Display ADJUST DISPLAY DEFAULT COLORS . If this does not correct the color problems, continue with the next step. 2. Run display service test 74 as described in “Test Patterns” on page 10-14. Confirm that there are four intensities for each color. • If the test passes, then continue. • If the test fails, then suspect the front panel cabling, A2, A19, or A18. 3.
Digital Control Troubleshooting Front Panel Troubleshooting (A1, A2) Front Panel Troubleshooting (A1, A2) Check Front Panel LEDs After Preset 1. Press Preset on the analyzer. 2. Observe that all front panel LEDs turn on and, within five seconds after releasing Preset , all but the Chan1 and Port 1 LED turns off. Refer to Figure 6-6. • If all the front panel LEDs either stay on or off, there is a control problem between A9 and A1/A2. See “Inspect Cables” on page 6-15.
Digital Control Troubleshooting Front Panel Troubleshooting (A1, A2) Identify the Stuck Key Match the front panel LED pattern with the patterns in Table 6-1. The LED pattern identifies the stuck key. Free the stuck key or replace the front panel part causing the problem. (The Chan 3 and Chan 4 LEDs are not used. ✸ = LED is on. The foots witch is an accessory that can be set up through a rear panel port.
Digital Control Troubleshooting Front Panel Troubleshooting (A1, A2) Table 6-1 Front Panel Key Codes Decimal Number LED Pattern Chan 1 R L T 22 ✸ ✸ ✸ 23 ✸ ✸ ✸ 24 ✸ ✸ 25 ✸ ✸ 26 ✸ ✸ ✸ 27 ✸ ✸ ✸ 28 ✸ ✸ ✸ 29 ✸ ✸ ✸ 30 ✸ ✸ ✸ 31 S Save/Recall ✸ Copy ✸ Entry Off Scale Ref ✸ Cal Marker Fctn ✸ ✸ Power Sweep Setup Not Used 32 ✸ 33 ✸ 34 ✸ ✸ 35 ✸ ✸ 36 ✸ ✸ 37 ✸ ✸ 38 ✸ ✸ 39 6-14 Chan 2 Key Chan 2 ✸ Chan 4 Format ✸ Avg Marker Search ✸ ✸ Stop Spa
Digital Control Troubleshooting Front Panel Troubleshooting (A1, A2) Table 6-1 Front Panel Key Codes Decimal Number LED Pattern R L Key Chan 1 Chan 2 T 48 ✸ ✸ 49 ✸ ✸ 50 ✸ ✸ ✸ 51 ✸ ✸ ✸ 52 ✸ ✸ ✸ 53 ✸ ✸ ✸ 54 ✸ ✸ ✸ ✸ 55 ✸ ✸ ✸ ✸ S softkey 1 ✸ softkey 2 softkey 3 ✸ softkey 4 softkey 5 ✸ softkey 6 softkey 7 ✸ softkey 8 Inspect Cables Remove the front panel assembly and visually inspect the ribbon cable that connects the front panel to the motherboard.
Digital Control Troubleshooting Run the Internal Diagnostic Tests Run the Internal Diagnostic Tests The analyzer incorporates 20 internal diagnostic tests. Most tests can be run as part of one or both major test sequences: all internal (test 0) and preset (test 1). 1. Press System INT tests. SERVICE MENU TESTS 0 x1 EXECUTE TEST to perform all 2. Then press 1 x1 to see the results of the preset test.
Digital Control Troubleshooting Run the Internal Diagnostic Tests Table 6-2 Internal Diagnostic Test with Commentary Test Sequencea Probable Failed Assembliesb: Comments and Troubleshooting Hints 0 All Int —- — : Executes tests 3-11, 13-16, 20. 1 Preset —- — : Executes tests 2-11, 14-16. Runs at power-on or preset. 2 ROM P,AI A9: Repeats on fail; refer to “CPU Troubleshooting (A9)” on page 6-5 to replace ROM or A9. 3 CMOS RAM P,AI A9: Replace A9.
Digital Control Troubleshooting If the Fault Is Intermittent If the Fault Is Intermittent Repeat Test Function If the failure is intermittent, do the following: 1. Press System SERVICE MENU TEST OPTIONS REPEAT ON to turn on the repeat function. 2. Then press RETURN TESTS . 3. Select the test desired and press EXECUTE TEST . 4. Press any key to stop the function. The test repeat function is explained in Chapter 10 , “Service Key Menus and Error Messages.
Digital Control Troubleshooting GPIB Failures GPIB Failures If you have performed “Step 3. GPIB Systems Check” on page 4-8, and you suspect there is an GPIB problem in the analyzer, perform the following test. It checks the internal communication path between the A9 CPU and the A16 rear panel. It does not check the GPIB paths external to the instrument. Press System SERVICE MENU TESTS 13 x1 EXECUTE TEST . • If the analyzer fails the test, the problem is likely to be the A16 rear panel.
Digital Control Troubleshooting GPIB Failures 6-20 Chapter 6
7 Source Troubleshooting 7-1
Source Troubleshooting Source Troubleshooting Source Troubleshooting Use this procedure only if you have read Chapter 4 , “Start Troubleshooting Here.” This chapter is divided into two troubleshooting procedures for the following problems: • Incorrect power levels: Perform the “Power” troubleshooting checks on page 7-5. • Phase lock error: Perform the “Phase Lock Error” troubleshooting checks on page 7-6.
Source Troubleshooting Assembly Replacement Sequence Assembly Replacement Sequence The following steps show the sequence to replace an assembly in the analyzer. 1. Identify the faulty group. Refer to Chapter 4 , “Start Troubleshooting Here.” Follow up with the appropriate troubleshooting chapter that identifies the faulty assembly. 2. Order a replacement assembly. Refer to Chapter 13 , “Replaceable Parts.” 3. Replace the faulty assembly and determine what adjustments are necessary.
Source Troubleshooting Before You Start Troubleshooting Before You Start Troubleshooting Make sure all of the assemblies are firmly seated. Also make sure that input R has a signal of at least −35 dBm (about 0.01 Vp-p into 50 ohms) at all times to maintain phase lock.
Source Troubleshooting Power Power If the analyzer output power levels are incorrect but no phase lock error is present, perform the following checks in the order given. For the following checks, make sure that the A9 switch is in the Alter position. 1. Source Default Correction Constants (Test 44) To run this test, press Preset System SERVICE MENU TESTS 44 x1 EXECUTE TEST . When complete, DONE should appear on the analyzer display.
Source Troubleshooting Phase Lock Error Phase Lock Error Figure 7-1 Basic Phase Lock Error Troubleshooting Equipment Setup Troubleshooting tools include the assembly location diagram and phase lock diagnostic tools. The assembly location diagram is on the underside of the instrument top cover. The diagram shows major assembly locations and RF cable connections.
Source Troubleshooting Phase Lock Error 2. Make sure the A9 CC switch is in the ALTER position: a. Remove the power line cord from the analyzer. b. Set the analyzer on its side. c. Remove the two corner bumpers from the bottom of the instrument with a T-15 TORX screwdriver. d. Loosen the captive screw on the bottom cover's back edge. e. Slide the cover toward the rear of the instrument. f. Set the switch to the ALTER position as shown in Figure 7-2. g.
Source Troubleshooting Phase Lock Error A4 Sampler/Mixer Check The A4, A5, and A6 (R, A and B) sampler/mixers are similar in operation. Any sampler can be used to phase lock the source. To eliminate the possibility of a faulty R sampler, follow this procedure. 1. Connect the power splitter, RF cable and attenuator to inputs A (or B) and R as shown in Figure 7-1. 2.
Source Troubleshooting Phase Lock Error NOTE If the analyzer failed internal test 48, default pretune correction constants were stored which may result in a constant offset of several MHz. Regardless, continue with this procedure. NOTE Use a spectrum analyzer for problems above 100 MHz. 1. Connect the oscilloscope or spectrum analyzer as shown in Figure 7-1. (Set the oscilloscope input impedance to 50 ohms.) 2.
Source Troubleshooting Phase Lock Error 6. The signal observed on the spectrum analyzer will appear jittery as in Figure 7-5 (B), not solid as in Figure 7-5 (A). This is because in SRC TUNE mode the output is not phase locked. Figure 7-5 Phase Locked Output Compared to Open Loop Output in SRC Tune Mode 7. Press Power to vary the power and check for corresponding level changes on the test instrument. (A power change of 20 dB will change the voltage observed on the oscilloscope by a factor of ten.) 8.
Source Troubleshooting Phase Lock Error YO Coil Drive Check with Analog Bus NOTE If the analog bus is not functional, perform the “YO Coil Drive Check with Oscilloscope” on page 7-11. 1. Press Preset System SOURCE PLL OFF ANALOG BUS . SERVICE MENU Meas ANALOG BUS ON S PARAMETERS SERVICE MODES ANALOG IN Aux Input AUTOSCALE . This keystroke 2.
Source Troubleshooting Phase Lock Error 3. Monitor the two YO coil drive lines. In source tune mode, the voltage difference should vary from approximately 3.5 to 5.0 volts as shown in Figure 7-7. • If the voltages are not correct, replace the faulty A11 assembly. • If the output signals from the A11 assembly are correct, replace the faulty A3 source assembly. • If neither the A11, nor the A3 assembly is faulty, continue with the next check.
Source Troubleshooting Phase Lock Error 4. Verify the remaining CW frequencies, comparing the counter reading with the value in Table 7-2: • Press 2 • Press 50 Table 7-2 M/µ . M/µ . Analog Bus Check of Reference Frequencies CW Frequency Analog Bus Node 21 100 kHz Analog Bus Node 24 2nd LO Analog Bus Node 25 PLREF 500 kHz 0.100 MHz 0.504 MHz 0.500 MHz 2 MHz 0.100 MHz 2.007 MHz 2.000 MHz 50 MHz 0.100 MHz 0.996 MHz 1.
Source Troubleshooting Phase Lock Error Oscilloscope Method You need not use the oscilloscope method unless the analog bus is non-functional or any of the signals fail the specifications listed in Table 7-2. If the analog bus is non-functional or the previous check has revealed questionable signals, observe the signals with an oscilloscope. Table 7-3 identifies a convenient test point and a plot for the five signals listed.
Source Troubleshooting Phase Lock Error PLREF Waveforms REF Signal At A11TP9 REF is the buffered PLREF+ signal. The 1st IF is phase locked to this signal. Use an oscilloscope to observe the signal at the frequencies noted in Figure 7-9 and Figure 7-10. High Band REF Signal In high band the REF signal is a constant 1 MHz square wave as indicated by Figure 7-9. Figure 7-9 High Band REF Signal (≥16 MHz CW) Low Band REF Signal In low band this signal follows the frequency of the RF output signal.
Source Troubleshooting Phase Lock Error FN LO at A12 Check 1. Use an oscilloscope to observe the FN LO from A14 at the cable end of A14J2. Press Preset System SERVICE MENU SERVICE MODES FRACN TUNE ON to switch on the fractional-N service mode. 2. Use the front panel knob to vary the frequency from 30 to 60 MHz. The signal should appear similar to Figure 7-11. The display will indicate 10 to 60.8 MHz. • If the FN LO signal is good, the A12 assembly is faulty.
Source Troubleshooting Phase Lock Error 2ND LO Waveforms The 2nd LO signals appear different in phase and shape at different frequencies. 90 Degree Phase Offset of 2nd LO Signals in High Band In high band, the 2nd LO is 996 kHz. As indicated by Figure 7-13, the 2nd LO actually consists of two signals 90 degrees out of phase.
Source Troubleshooting Phase Lock Error A12 Digital Control Signals Check Several digital control signals must be functional for the A12 assembly to operate properly. Check the control lines listed in Table 7-1 with the oscilloscope in the high input impedance setting.
Source Troubleshooting Phase Lock Error Figure 7-16 Complementary L HB and L LB Signals (Preset) If all of the digital signals appear good, the A12 assembly is faulty.
Source Troubleshooting Phase Lock Error A13/A14 Fractional-N Check Use the analog bus or an oscilloscope to check the A14 VCO's ability to sweep from 30 MHz to 60 MHz. The faster analog bus method should suffice unless problems are detected. Fractional-N Check with Analog Bus 1. Press Preset System SERVICE MENU ANALOG BUS ON Meas S PARAMETERS ANALOG IN Aux Input FRAC N to switch on the analog bus and the fractional-N counter. 2. Press Sweep Setup CW FREQ to set the analyzer to CW mode. 3.
Source Troubleshooting Phase Lock Error Figure 7-17 10 MHz HI OUT Waveform from A14J1 Figure 7-18 25 MHz HI OUT Waveform from A14J1 Chapter 7 7-21
Source Troubleshooting Phase Lock Error Figure 7-19 60 MHz HI OUT Waveform from A14J1 A14 VCO Exercise The nominal tuning voltage range of the VCO is +10 to −5 volts. When the analyzer is in operation, this voltage is supplied by the A13 assembly. This procedure substitutes a power supply for the A13 assembly to check the frequency range of the A14 VCO. 1. Switch off the analyzer and remove the A13 assembly. 2. Put the A14 assembly on an extender board and switch on the instrument. 3.
Source Troubleshooting Phase Lock Error 4. Vary the voltage at A14TP14 from +10 to −5 volts either by: • Connecting an appropriate external power supply to A14TP14, or • First jumping the +15 V internal power supply from A8TP8 to A14TP14 and then jumping the −5.2 V supply from A8TP10 to A14TP14. 5. Confirm that the VCO frequency changes from approximately 30 MHz or less to 60 MHz or more. 6. If this procedure produces unexpected results, the A14 assembly is faulty. 7.
Source Troubleshooting Phase Lock Error Table 7-6 A14-to-A13 Digital Control Signal Locations Mnemonic A13 Location A14 Location CST none TP3 L FNHOLD P2-2 P2-2 FNBIAS P2-5 P2-5 API1 P2-32 P2-32 API2 P2-3 P2-3 API3 P2-34 P2-34 API4 P2-4 P2-4 API5 P2-35 P2-35 FN LATCH P1-28 P1-58 Figure 7-21 A14 Generated Digital Control Signals H MB Line This signal is active during the 16 MHz to 31 MHz sweep.
Source Troubleshooting Phase Lock Error Figure 7-22 H MB Signal at A14P1-5 (Preset and 16 MHz to 31 MHz Sweep) A7 Pulse Generator Check The pulse generator affects phase lock in high band only. It can be checked with either a spectrum analyzer or an oscilloscope. A7 Pulse Generator Check with Spectrum Analyzer 1. Remove the A7-to-A6 SMB cable (W7) from the A7 pulse generator assembly. Set the analyzer to generate a 16 MHz CW signal.
Source Troubleshooting Phase Lock Error 2. If the analyzer malfunction relates to a particular frequency or range, look more closely at the comb tooth there. Adjust the spectrum analyzer span and bandwidth as required. Even at 3 GHz, the comb should look as clean as Figure 7-24. For Option 006 instruments at 6 GHz, the comb tooth level should be approximately −46 dBm. Figure 7-24 High Quality Comb Tooth at 3 GHz 3. If the signal at the A7 output is good, check the A7-to-A4 cable. 4.
Source Troubleshooting Phase Lock Error Figure 7-25 Stable HI OUT Signal in FRACN TUNE Mode A7 Pulse Generator Check with Oscilloscope Perform this check if a spectrum analyzer is not available. 1. Remove the A4-to-A11 SMB cable from the A4 (R) sampler/mixer output. Connect the oscilloscope to the A4 output (1st IF). 2. Activate the FRACN TUNE service mode and tune the fractional-N to 50 MHz. Press System SERVICE MENU SERVICE MODES FRACN TUNE ON 50 M/µ . 3.
Source Troubleshooting Phase Lock Error Figure 7-26 Typical 1st IF Waveform in FRACN TUNE/SRC TUNE Mode A11 Phase Lock Check At this point, the A11 phase lock assembly appears to be faulty (its inputs should have been verified already). Nevertheless, you may elect to use the phase lock diagnostic routines or check the relevant signals at the assembly itself for confirmation. NOTE If external source mode is the only operating mode with phase lock problems, replace the A11 phase lock assembly.
Source Troubleshooting Phase Lock Error Phase Lock Check by Signal Examination To confirm that the A11 assembly is receiving the signals required for its proper operation, perform the following steps. 1. Place the A11 assembly on the large extender board. 2. Switch on the analyzer and press Preset . 3. Check for the signals listed in Table 7-8. Table 7-8 A11 Input Signals Mnemonic I/O FM COIL − O Access See Figure Notes A11P1-3,33 Figure 7-27 Aids YO COIL in setting YIG.
Source Troubleshooting Source Group Troubleshooting Appendix Source Group Troubleshooting Appendix Troubleshooting Source Problems with the Analog Bus The analog bus can perform a variety of fast checks. However, it too is subject to failure and thus should be tested prior to use. You should have done this in Chapter 4 , “Start Troubleshooting Here.” To use the analog bus to check any one of the nodes, press Preset System SERVICE MENU ANALOG BUS IN .
Source Troubleshooting Source Group Troubleshooting Appendix Phase Lock Diagnostic Routines Perform the following steps to determine at what frequencies and bands the phase lock problem occurs. 1. Press Preset System SERVICE MENU SERVICE MODES PLL AUTO OFF to switch off the automatic phase-locked loop. Normally, when the phase-locked loop detects lock problems, it automatically aborts the sweep and attempts to recalibrate the pretune cycle. Switching off PLL AUTO defeats this routine. 2.
Source Troubleshooting Source Group Troubleshooting Appendix 7-32 Chapter 7
8 Receiver Troubleshooting 8-1
Receiver Troubleshooting Receiver Troubleshooting Receiver Troubleshooting Use this procedure only if you have read Chapter 4 , “Start Troubleshooting Here.” Follow the procedures in the order given, unless instructed otherwise.
Receiver Troubleshooting Assembly Replacement Sequence Assembly Replacement Sequence The following steps show the sequence to replace an assembly in the analyzer. 1. Identify the faulty group. Refer to Chapter 4 , “Start Troubleshooting Here.” Follow up with the appropriate troubleshooting chapter that identifies the faulty assembly. 2. Order a replacement assembly. Refer to Chapter 13 , “Replaceable Parts.” 3. Replace the faulty assembly and determine what adjustments are necessary.
Receiver Troubleshooting Receiver Failure Error Messages Receiver Failure Error Messages The error messages which indicate receiver group problems may be caused by the instrument itself or by external devices or connections. The following three error messages share the same description.
Receiver Troubleshooting Check the R, A, and B Inputs Check the R, A, and B Inputs Good inputs produce traces similar to Figure 8-2 in terms of flatness. To examine each input trace, do the following: 1. Connect the equipment as shown in Figure 8-1. (The through cable part number is 8120-4781.) Figure 8-1 Equipment Setup 2. Check the flatness of the input R trace by comparing it with the trace in Figure 8-2.
Receiver Troubleshooting Check the R, A, and B Inputs • If at least one input resembles Figure 8-2, continue with “Troubleshooting When One or More Inputs Look Good” on page 8-11.
Receiver Troubleshooting Troubleshooting When All Inputs Look Bad Troubleshooting When All Inputs Look Bad Run Internal Tests 18 and 17 1. Press Preset System run the ADC offset. SERVICE MENU TESTS 2. Then, when the analyzer finishes test 18, press 17 ADC linearity test. 18 x1 x1 EXECUTE TEST to EXECUTE TEST to run the If either of these tests FAIL, the A10 assembly is probably faulty.
Receiver Troubleshooting Check the 4 MHz REF Signal Check the 4 MHz REF Signal 1. Connect a cable from the RF OUT port to input R. 2. Press Preset . 3. Use an oscilloscope to observe the 4 MHz reference signal at A10P2-6. • If the signal does not resemble Figure 8-3, troubleshoot the signal source (A12P2-36) and path. • If the signal is good, the probability is greater than 90% that the A10 assembly is faulty. For confirmation, perform “Check A10 by Substitution or Signal Examination,” next.
Receiver Troubleshooting Check the 4 MHz REF Signal Check A10 by Substitution or Signal Examination If the 4 MHz REF signal is good at the A10 digital IF assembly, check the A10 assembly by one of the following methods: • Substitute another A10 assembly or • Check the signal/control lines required for its operation. The pins and signal sources of those lines are identified in Table 8-1. It is possible that the A9 assembly may not be providing the necessary signals.
Receiver Troubleshooting Check the 4 MHz REF Signal Figure 8-4 Digital Data Lines Observed Using L INTCOP as Trigger Figure 8-5 Digital Control Lines Observed Using L INTCOP as Trigger 8-10 Chapter 8
Receiver Troubleshooting Troubleshooting When One or More Inputs Look Good Troubleshooting When One or More Inputs Look Good Since at least one input is good, all of the common receiver circuitry beyond the multiplexer is functional. Only the status of the individual sampler/mixers and their individual signal paths is undetermined. Check the 4 kHz Signal 1. Connect a cable from the RF OUT port to input R. 2. Press Preset Menu CW FREQ . 3.
Receiver Troubleshooting Troubleshooting When One or More Inputs Look Good Check the Trace with the Sampler Correction Constants Off 1. Press Preset Meas A Scale Ref AUTO SCALE . 2. The trace is currently being displayed with the sampler correction constants on and should resemble Figure 8-7a. 3. Press System SERVICE MENU SERVICE MODES MORE SAMPLER COR OFF . 4. The trace is now being displayed with sampler correction constants off and should have worsened to resemble Figure 8-7b. 5.
Receiver Troubleshooting Troubleshooting When One or More Inputs Look Good Check 2nd LO Signal at Sampler/Mixer Check the 2nd LO signal at the pins identified in Table 8-3. Refer to the “A12 Reference Check” on page 7-12 for analog bus and oscilloscope checks of the 2nd LO and waveform illustrations. Table 8-3 identifies the signal location at the samplers and the A12 assembly.
Receiver Troubleshooting Troubleshooting When One or More Inputs Look Good 8-14 Chapter 8
9 Accessories Troubleshooting 9-1
Accessories Troubleshooting Accessories Troubleshooting Accessories Troubleshooting Use this procedure only if you have read Chapter 4 , “Start Troubleshooting Here.” Follow the procedures in the order given, unless instructed otherwise. Measurement failures can be divided into two categories: • Failures which don't affect the normal functioning of the analyzer but render incorrect measurement data. • Failures which impede the normal functioning of the analyzer or prohibit the use of a feature.
Accessories Troubleshooting Assembly Replacement Sequence Assembly Replacement Sequence The following steps show the sequence to replace an assembly in the analyzer. 1. Identify the faulty group. Refer to Chapter 4 , “Start Troubleshooting Here.” Follow up with the appropriate troubleshooting chapter that identifies the faulty assembly. 2. Order a replacement assembly. Refer to Chapter 13 , “Replaceable Parts.” 3. Replace the faulty assembly and determine what adjustments are necessary.
Accessories Troubleshooting Inspect the Accessories Inspect the Accessories Inspect the Test Port Connectors and Calibration Devices 1. Check for damage to the mating contacts of the test port center conductors and loose connector bulkheads. 2. Check the test set and power splitter connectors for defects as well. 3. Inspect the calibration kit devices for bent or broken center conductors and other physical damage.
Accessories Troubleshooting Inspect the Error Terms Inspect the Error Terms Error terms are a measure of a “system”: a network analyzer, calibration kit, and any cables used. As required, refer to Chapter 11 , “Error Terms,” for the following: • The specific measurement calibration procedure used to generate the error terms. • The routines required to extract error terms from the instrument. • Typical error term data. Use Table 9-1 to cross-reference error term data to system faults.
Accessories Troubleshooting Inspect the Error Terms If you detect problems using error term analysis, use the following approach to isolate the fault: 1. Check the cable by examining the load match and transmission tracking terms. If those terms are incorrect, go to “Cable Test” on page 9-6. 2. Verify the calibration kit devices: • Loads: If the directivity error term looks good, the load and the test port are good.
Accessories Troubleshooting Inspect the Error Terms Verify Shorts and Opens Substitute a known good short and open of the same connector type and sex as the short and open in question. If the devices are not from one of the standard calibration kits, refer to the analyzer’s user’s guide for information on how to use the MODIFY CAL KIT function. Set aside the short and open that are causing the problem. 1. Perform an S11 1-port calibration using the good short and open.
Accessories Troubleshooting Test Set Troubleshooting Test Set Troubleshooting Test set problems are of three varieties: RF problems, power problems, and control problems. The HP/Agilent 85044A/B test set can only experience RF problems because it is not powered by the analyzer. To troubleshoot: • The 85044A/B: refer to its manual. • S-parameter test set problems: refer to the manuals.
Accessories Troubleshooting Test Set Troubleshooting Figure 9-3 Switch Positions on the A9 CPU 2. Press Preset x1 . System SERVICE MENU PEEK/POKE ADDRESS 1619001527 3. “Poke” the address for the appropriate test set • 85047A: Press POKE • 85046A/B: Press POKE 5 x1 1 x1 Preset . Preset . 4. Measure the DC voltage at pin 14 (see Figure 9-4) of the analyzer rear panel test set interconnect connector.
Accessories Troubleshooting Test Set Troubleshooting • If the voltage is between 21.3 V and 22.7 V, the supply is good. Proceed with either of the following: — Refer to the test set manual to troubleshoot the test set and its interconnect cable (especially if the test set LEDs don’t light). — Continue with “Troubleshooting Control Problems in S-Parameter Test Sets.” 5. Be certain to press POKE 0 x1 Preset after all troubleshooting and return the A9 CC switch to the “normal” position.
Accessories Troubleshooting Test Set Troubleshooting Measurement Control Signals Voltage levels on the pins identified in Table 9-3 control measurement direction (forward or reverse) and the doubler off function. Press Meas S PARAMETERS and enter the measurements listed below. After each entry, check the pins (see Figure 9-4) for the indicated voltages.
Accessories Troubleshooting Test Set Troubleshooting 9-12 Chapter 9
10 Service Key Menus and Error Messages 10-1
Service Key Menus and Error Messages The functions available in the service key menus allow you to perform the following service functions: • test • verify • adjust • control • troubleshoot The main section of this chapter, “Service Key Menus,” divides the menus into three groups: • “Internal Diagnostics Menus” on page 10-3 • “Service Feature Menus” on page 10-16 • “Firmware Revision Softkey” on page 10-41 Additionally, there are sections providing information on the following: • “GPIB Service Mnemonic Def
Service Key Menus and Error Messages Service Key Menus Service Key Menus Internal Diagnostics Menus The internal diagnostics menus are shown in Figure 10-1 and described in the following tables. The following keys access the internal diagnostics menus: • TESTS • TEST OPTIONS • SELF DIAGNOSE Figure 10-1 NOTE Internal Diagnostics Menus Throughout this service guide, these conventions are observed: • Hardkeys are labeled front panel keys. • SOFTKEYS are display-defined keys (in the menus).
Service Key Menus and Error Messages Service Key Menus Tests Menu To access this menu, press System SERVICE MENU TESTS . The Tests menu allows you to select or execute the service tests. The default is set to internal test 1. To select a test via GPIB command, use the TEST[D] command. NOTE Descriptions of tests in each of the categories are given in “Test Descriptions” on page 10-8.
Service Key Menus and Error Messages Service Key Menus Table 10-2 Tests Menu Keys Key EXECUTE TEST GPIB Mnemonic EXET Description Runs the selected test and may display these softkeys: CONTINUE (TESR1) continues the selected test. YES (TESR2) alters correction constants during adjustment tests. NEXT (TESR4) displays the next choice. SELECT (TESR6) chooses the option indicated. ABORT (TESR8) terminates the test and returns to the tests menu.
Service Key Menus and Error Messages Service Key Menus Test Options Menu To access this menu, press System Table 10-3 SERVICE MENU TEST OPTIONS . Test Options Menu Keys Key TEST OPTIONS CONTINUE TEST GPIB Mnemonic N/A TESR1 Description Accesses softkeys that affect the way tests (routines) run, or supply necessary additional data. Resumes the test from where it was stopped. REPEAT on OFF TO2 Toggles the repeat function on and off.
Service Key Menus and Error Messages Service Key Menus Edit List Menu To access this menu, press System SERVICE MENU TEST OPTIONS LOSS/SENSR LISTS , and then press one of the following: CAL FACTOR SENSOR A or CAL FACTOR SENSOR B or POWER LOSS . Table 10-4 Edit List Menu Keys Key SEGMENT EDIT GPIB Mnemonic N/A SEDI[D] Description Selects a segment (frequency point) to be edited, deleted from, or added to the current data table. Works with the entry controls.
Service Key Menus and Error Messages Service Key Menus Test Descriptions The analyzer has up to 80 routines that test, verify, and adjust the instrument. This section describes those tests. Internal Tests This group of tests runs without external connections or operator interaction. All return a PASS or FAIL condition. All of these tests run on power-up and PRESET except as noted. Table 10-5 Test Number 10-8 Internal Tests Test Name Description 0 ALL INT Runs only when selected.
Service Key Menus and Error Messages Service Key Menus Table 10-5 Test Number Internal Tests Test Name Description 5 DSP Wr/Rd Verifies the ability of the main processor and the DSP (digital signal processor), both on the A9 CPU assembly, to communicate with each other through DRAM. This also verifies that programs can be loaded to the DSP, and that most of the main RAM access circuits operate correctly.
Service Key Menus and Error Messages Service Key Menus Table 10-5 Test Number Internal Tests Test Name Description 19 ABUS Test Tests analog bus accuracy, by measuring several analog bus reference voltages (all nodes from the A10 digital IF). This runs only when selected. 20 FN Count Uses the internal counter to count the A14 fractional-N VCO frequency (120 to 240 MHz) and the divided fractional-N frequency (100 kHz).
Service Key Menus and Error Messages Service Key Menus System Verification Tests These tests apply mainly to system-level, error-corrected verification and troubleshooting. Tests 27 to 31 are associated with the system verification procedure, documented in Chapter 2 , “Performance Tests.” Tests 32 to 43 facilitate examining the calibration coefficient arrays (error terms) resulting from a measurement calibration; refer to Chapter 11 , “Error Terms,” for details.
Service Key Menus and Error Messages Service Key Menus Adjustment Tests These tests (except as noted) are used in the procedures located in Chapter 3 , “Adjustments and Correction Constants.” Table 10-8 Test Number Adjustment Tests Test Name Description 44 Source Def Writes default correction constants for rudimentary source power accuracy. Use this test before running test 47, below. 45 Pretune Def Writes default correction constants for rudimentary phase lock pretuning accuracy.
Service Key Menus and Error Messages Service Key Menus Display Tests These tests return a PASS/FAIL condition. All six amber front panel LEDs will turn off if the test passes. Press Preset to exit the test. If any of the six LEDs remain on, the test has failed. Table 10-9 Display Tests Test Number Test Name Description 59 Disp/cpu com Checks to confirm that the CPU can communicate with the A19 GSP board.
Service Key Menus and Error Messages Service Key Menus Test Patterns Test patterns are used in the factory for display adjustments, diagnostics, and troubleshooting, but they are not used for field service. Test patterns are executed by entering the test number (66 through 80), then pressing EXECUTE TEST CONTINUE . The test pattern will be displayed and the softkey labels blanked. To increment to the next pattern, press softkey 1; to go back to a previous pattern, press softkey 2.
Service Key Menus and Error Messages Service Key Menus Table 10-10 Test Number Test-Patterns Test Name Description 77 Test Pat 12 Displays a repeating gray scale for troubleshooting, using an oscilloscope. It is similar to the 16 step gray scale but is repeated 32 times across the screen. Each of the 3 outputs of the video palette will then show 32 ramps (instead of one staircase) between each horizontal sync pulse.
Service Key Menus and Error Messages Service Key Menus Service Feature Menus The service feature menus are shown in Figure 10-2 and described in the following tables. The following keys access the service feature menus: • SERVICE MODES • ANALOG BUS on OFF • PEEK/POKE • FIRMWARE REVISION Figure 10-2 Service Feature Menus Service Modes Menu The service modes menu allows you to control and monitor various circuits for troubleshooting. To access this menu, press System SERVICE MENU .
Service Key Menus and Error Messages Service Key Menus SERVICE MODES Table 10-11 Service Modes Menu Keys Key GPIB Mnemonic FRACN TUNE on OFF SM1 Description Tests the A13 and A14 fractional-N circuits. It allows you to directly control and monitor the output frequency of the fractional-N synthesizer (10 MHz to 60 MHz). Set the instrument to CW sweep mode and then set FRACN TUNE ON. Change frequencies with the front panel keys or knob.
Service Key Menus and Error Messages Service Key Menus Table 10-11 Service Modes Menu Keys Key PLL AUTO ON off GPIB Mnemonic SM4 Description Automatically attempts to determine new pretune values when the instrument encounters phase lock problems (for example, “harmonic skip”). With PLL AUTO OFF , the frequencies and voltages do not change, like when they are attempting to determine new pretune values, so troubleshooting the phase-locked loop circuits is more convenient.
Service Key Menus and Error Messages Service Key Menus Table 10-11 Service Modes Menu Keys Key GPIB Mnemonic Description IF GAIN OFF N/A Switches in both of the A10 IF attenuators for checking the A10 IF gain amplifier circuits. Small input signals will appear noisy, and raise the apparent noise floor of the instrument. SPUR TEST on OFF SM7 For factory use only. STORE EEPR on OFF N/A Allows you to store the correction constants that reside in non-volatile memory (EEPROM) onto a disk.
Service Key Menus and Error Messages Service Key Menus Analog Bus To access the analog bus, press System SERVICE MENU ANALOG BUS ON . Description of the Analog Bus The analog bus is a single multiplexed line that networks 31 nodes within the instrument. It can be controlled from the front panel, or through GPIB, to make voltage and frequency measurements just like a voltmeter, oscilloscope, or frequency counter.
Service Key Menus and Error Messages Service Key Menus • About 0.750 MHz is a typical counter reading with no AC signal present. • Anything occurring during bandswitches is not visible. • Fast-moving waveforms may be sensitive to sweep time. • The analog bus input impedance is about 50K ohms. • Waveforms up to approximately 200 Hz can be reproduced. Analog In Menu Select this menu to monitor voltage and frequency nodes, using the analog bus and internal counter, as explained below.
Service Key Menus and Error Messages Service Key Menus Table 10-12 Analog In Menu Keys Key GPIB Mnemonic Description FRAC N N/A Switches the counter to monitor the A14 fractional-N VCO frequency at the node shown on the “Overall Block Diagram,” in Chapter 4 , “Start Troubleshooting Here.” DIV FRAC N N/A Switches the counter to monitor the A14 fractional-N VCO frequency after it has been divided down to 100 kHz for phase locking the VCO.
Service Key Menus and Error Messages Service Key Menus Node 1 Mn Pwr DAC (main power DAC) Perform step A3 to set up a power sweep on the analog bus. Then press Meas ANALOG IN 1 AUTO SCALE . x1 Scale Ref Node 1 is the output of the main power DAC. It sets the reference voltage to the ALC loop. At normal operation, this node should read approximately −4 volts at 0 dBm with a slope of about −150 mV/dB. This corresponds to approximately 4 volts from −15 to +10 dBm.
Service Key Menus and Error Messages Service Key Menus Node 2 Src 1V/GHz (source 1 volt per GHz) Press the following to view analog bus node 2: Preset Start 30 k/m System SERVICE MENU ANALOG BUS ON Meas ANALOG IN 2 AUTO SCALE x1 Format MORE REAL Scale Ref Node 2 measures the voltage on the internal voltage controlled oscillator. Or, in normal operation, it should read −1 V/GHz.
Service Key Menus and Error Messages Service Key Menus Node 3 Amp Id (amplifier current) Press the following keys to view analog node 3: Preset Format System MORE SERVICE MENU REAL Scale Ref ANALOG BUS ON Meas ANALOG IN 3 x1 AUTO SCALE Node 3 measures the current that goes to the main IF amplifier.
Service Key Menus and Error Messages Service Key Menus Node 4 Det (detects RF OUT power level) Perform step A3, described previously, to set up a power sweep on the analog bus. Then AUTO SCALE . press Meas ANALOG IN 4 x1 Scale Ref Node 4 detects power that is coupled and detected from the RF OUT arm to the ALC loop. Note that the voltage exponentially follows the power level inversely. Flat segments indicate ALC saturation and should not occur between −85 dBm and +10 dBm.
Service Key Menus and Error Messages Service Key Menus Node 6 Integ (ALC leveling integrator output) Perform step A3 to set up a power sweep on the analog bus. Then press Meas ANALOG IN 6 AUTO SCALE . x1 Scale Ref Node 6 displays the output of the summing circuit in the ALC loop. Absolute voltage level variations are normal. When node 6 goes above 0 volts, the ALC saturation is indicated.
Service Key Menus and Error Messages Service Key Menus Node 7 Log (log amplifier output detector) Perform step A3 to set up a power sweep on the analog bus. Then press Meas ANALOG IN 7 AUTO SCALE . x1 Scale Ref Node 7 displays the output of a logger circuit in the ALC loop. The trace should be a linear ramp with a slope of 33 mv/dB with approximately 0 volts at −3 dBm. Absolute voltage level variations are normal. Flat segments indicate ALC saturation and should not occur between −15 dBm and +10 dBm.
Service Key Menus and Error Messages Service Key Menus Node 9 +0.37 V (+0.37 V reference) Perform step A10, above, and then press Meas 9 x1 . ANALOG IN RESOLUTION [HIGH] Check for a flat line at approximately +0.37 V. This is used as the voltage reference in “Analog Bus Correction Constants (Test 46)” on page 3-9. The voltage level should be the same in high and low resolution; the absolute level is not critical. Node 10 +2.50 V (+2.
Service Key Menus and Error Messages Service Key Menus Node 14 Vbb Ref (ECL reference voltage level) Perform step A11 and then press Meas REFERENCE VALUE −1.29 x1 . ANALOG IN 14 x1 Scale Ref 0.3 x1 The trace should be a flat line across the entire operation frequency range within 0.3 V (one division) of the reference value. Vbb Ref is used to compensate for ECL voltage drift.
Service Key Menus and Error Messages Service Key Menus Node 15 Pretune (open-loop source pretune voltage) Perform step A11 and then press Meas AUTO SCALE . ANALOG IN 15 x1 Scale Ref This node displays the source pretune signal and should look like a stair-stepped ramp. Each step corresponds to the start of a band.
Service Key Menus and Error Messages Service Key Menus Node 16 1V/GHz (source oscillator tuning voltage) Perform step A11 and then press Meas AUTO SCALE . ANALOG IN 16 x1 Scale Ref This node displays the tuning voltage ramp used to tune the source oscillator. You should see a voltage ramp like the one shown in Figure 10-11.
Service Key Menus and Error Messages Service Key Menus Node 17 1st IF (IF used for phase lock) Perform step A11 and then press Meas COUNTER: ANALOG BUS ANALOG IN Sweep Setup 17 x1 CW FREQ . Vary the frequency and compare the results to the table below. Entered Frequency Counter Reading 0.2 to 15.999 MHz same as entered 16 MHz to 3 GHz 1 MHz This node displays the IF frequency (see Figure 10-12) as it enters the A11 phase lock assembly via the A4 R sampler assembly.
Service Key Menus and Error Messages Service Key Menus Node 18 IF Det 2N (IF on A11 phase lock after 3 MHz filter) Perform step A11 and then press Meas Scale Ref AUTOSCALE . ANALOG IN 18 x1 Stop 20 M/µ This node detects the IF within the low pass filter/limiter. The filter is used during the track and sweep sequences but never in band 1 (3.3 to 16 MHz). The low level (about −1.7 V) means IF is in the passband of the filter. This node can be used with the FRAC N TUNE and SRC TUNE service modes.
Service Key Menus and Error Messages Service Key Menus Node 20 IF Det 1 (IF after 30 MHz filter) Perform step A11 and then press Meas REFERENCE VALUE −1.29 x1 . ANALOG IN 20 x1 Scale Ref 0.3 x1 The trace should be a flat line across the entire frequency band at least 0.5 V greater than Vbb (node 14). The correct trace indicates the presence of IF after the first 30 MHz filter/limiter. Figure 10-14 Analog Bus Node 20 A12 Reference To observe the A12 analog bus nodes perform step A12, below.
Service Key Menus and Error Messages Service Key Menus Node 23 VCO Tune (A12 VCO tuning voltage) Perform Step A12 and then press Start ANALOG IN 23 x1 Marker 11 Scale Ref M/µ Stop 21 M/µ Meas AUTO SCALE . The trace should show a voltage step as shown in Figure 10-15. At normal operation, the left half trace should be 0 ±1000 mV and the right half trace should be 100 to 200 mV higher (that is, one to two divisions).
Service Key Menus and Error Messages Service Key Menus Node 24 2nd LO Perform step A12 and then press Meas COUNTER: ANALOG BUS ANALOG IN 24 x1 CW FREQ . Sweep Setup This node counts the 2nd LO used by the sampler/mixer assemblies to produce the 2nd IF of 4 kHz. As you vary the frequency, the counter reading should change to values very close to those indicated below: Frequency Entered Counter Reading 0.
Service Key Menus and Error Messages Service Key Menus Node 27 VCXO Tune (40 MHz VCXO tuning voltage) Perform step A12 and then press Meas MARKER →REFERENCE . ANALOG IN 27 x1 Marker Fctn This node displays the voltage used to fine tune the A12 reference VCXO to 40 MHz. You should see a flat line at some voltage level (the actual voltage level varies from instrument to instrument). Anything other than a flat line indicates that the VCXO is tuning to different frequencies.
Service Key Menus and Error Messages Service Key Menus Node 30 FN VCO Det (A14 VCO detector) Perform step A14 and then press Meas Scale Ref 50 k/m . ANALOG IN 30 x1 RESOLUTION [HIGH] See whether the FN VCO is oscillating. The trace should resemble Figure 10-17. Figure 10-17 Analog Bus Node 30 Node 31 Count Gate (analog bus counter gate) Perform step A14 and then press Meas ANALOG IN 31 x1 Scale Ref 2 x1 . You should see a flat line at +5 V across the operating frequency range.
Service Key Menus and Error Messages Service Key Menus PEEK/POKE Menu To access this menu, press System Table 10-13 SERVICE MENU PEEK/POKE . PEEK/POKE Menu Keys Key PEEK/POKE GPIB Mnemonic N/A Description Allows you to edit the content of one or more memory addresses. The keys are described below. CAUTION PEEK/POKE ADDRESS PEEL[D] PEEK PEEK POKE POKE[D] The PEEK/POKE capability is intended for service use only.
Service Key Menus and Error Messages Service Key Menus Firmware Revision Softkey Press System SERVICE MENU FIRMWARE REVISION to display the current firmware revision information. The number and implementation date appear in the active entry area of the display as shown in Figure 10-18. The analyzer's serial number and installed options are also displayed. Another way to display the firmware revision information is to cycle the line power.
Service Key Menus and Error Messages GPIB Service Mnemonic Definitions GPIB Service Mnemonic Definitions All service routine keystrokes can be made through GPIB in one of the following approaches: • sending equivalent remote GPIB commands. (Mnemonics have been documented previously with the corresponding keystroke.) • invoking the System Menu (MENUSYST) and using the analyzer mnemonic (SOFTn), where “n” represents the softkey number. (Softkeys are numbered 1 to 8 from top to bottom.
Service Key Menus and Error Messages GPIB Service Mnemonic Definitions Analog Bus Codes ANAI[D] Measures and displays the analog input. The preset state input to the analog bus is the rear panel AUX IN. The other 30 nodes may be selected with D only if the ABUS is enabled (ANABon). OUTPCNTR Outputs the counter's frequency data. OUTPERRO Reads any prompt message sent to the error queue by a service routine. OUTPTESS Outputs the integer status of the test most recently executed.
Service Key Menus and Error Messages Error Messages Error Messages This section contains an alphabetical list of the error messages that pertain to servicing the analyzer. The information in the list includes explanations of the displayed messages and suggestion to help solve the problem. NOTE The error messages that pertain to measurement applications are included in the your analyzer’s reference guide. BATTERY FAILED.
Service Key Menus and Error Messages Error Messages CURRENT PARAMETER NOT IN CAL SET Error Number 64 Correction is not valid for your selected measurement parameter. Either change the measurement parameters or perform a new calibration. DEADLOCK Error Number 111 A fatal firmware error occurred before instrument preset completed. DEVICE: not on, not connect, wrong addrs Error Number 119 The device at the selected address cannot be accessed by the analyzer.
Service Key Menus and Error Messages Error Messages NO FILE(S) FOUND ON DISK Error Number 45 No files of the type created by an analyzer store operation were found on the disk. If you requested a specific file title, that file was not found on the disk. NO IF FOUND: CHECK R INPUT LEVEL Error Number 5 The first IF signal was not detected during pretune. Check the front panel R channel jumper. If there is no visible problem with the jumper, refer to Chapter 7 , “Source Troubleshooting.
Service Key Menus and Error Messages Error Messages PARALLEL PORT NOT AVAILABLE FOR GPIO Error Number 165 You have defined the parallel port as COPY for sequencing in the GPIB menu. To access the parallel port for general purpose I/O (GPIO), set the selection to [GPIO]. PARALLEL PORT NOT AVAILABLE FOR COPY Error Number 167 You have defined the parallel port as general purpose I/O (GPIO) for sequencing. The definition was made under the Local key menus.
Service Key Menus and Error Messages Error Messages POWER SUPPLY SHUT DOWN! Error Number 22 One or more supplies on the A8 post-regulator assembly have been shut down due to an over-current, over-voltage, or under-voltage condition. Refer to Chapter 5 , “Power Supply Troubleshooting.” POWER UNLEVELED Error Number 179 There is either a hardware failure in the source or you have attempted to set the power level too high. Check to see if the power level you set is within specifications.
Service Key Menus and Error Messages Error Messages SOURCE POWER TURNED OFF, RESET UNDER POWER MENU Information Message You have exceeded the maximum power level at one of the inputs and power has been automatically reduced. The annotation P⇓ indicates that power trip has been activated. When this occurs, reset the power and then press Power SOURCE PWR on OFF , to switch on the power. This message follows error numbers 57, 58, and 59.
Service Key Menus and Error Messages Error Messages 10-50 Chapter 10
11 Error Terms 11-1
Error Terms Error Terms Error Terms The analyzer generates and stores factors in internal arrays when a measurement error-correction (measurement calibration) is performed. These factors are known by the following terms: • error terms • E-terms • measurement calibration coefficients The analyzer creates error terms by measuring well-defined calibration devices over the frequency range of interest and comparing the measured data with the ideal model for the devices.
Error Terms Error Terms Can Serve a Diagnostic Purpose Error Terms Can Serve a Diagnostic Purpose Specific parts of the analyzer and its accessories directly contribute to the magnitude and shape of the error terms. Since we know this correlation and we know what typical error terms look like, we can examine error terms to monitor system performance (preventive maintenance) or to identify faulty components in the system (troubleshooting).
Error Terms Full Two-Port Error-Correction Procedure Full Two-Port Error-Correction Procedure NOTE This is the most accurate error-correction procedure for the analyzer. Since the analyzer takes both forward and reverse sweeps, this procedure takes more time than the other correction procedures. 1. Set any measurement parameters that you want for the device measurement: power, format, number of points, IF bandwidth. 2. To access the measurement correction menus, press Cal . 3.
Error Terms Full Two-Port Error-Correction Procedure 9. Disconnect the short, and connect an impedance-matched load to PORT 1. 10.To measure the standard, when the displayed trace has settled, press FORWARD: LOAD . The analyzer underlines the LOAD softkey after it measures the standard. 11.Repeat the open-short-load measurements descried above, but connect the devices in turn to PORT 2, and use the REVERSE: OPEN , REVERSE: SHORT , and REVERSE: LOAD softkeys. 12.
Error Terms Full Two-Port Error-Correction Procedure c. Press Cal RESUME CAL SEQUENCE FWD ISOL'N ISOL'N STD REV ISOL'N ISOL'N STD ISOLATION DONE . d. Return the averaging to the original state of the measurement, and press Cal RESUME CAL SEQUENCE . 17.To compute the error coefficients, press DONE 2-PORT CAL . The analyzer displays the corrected measurement trace. The analyzer also shows the notation Cor at the left of the screen, indicating that error-correction is on.
Error Terms Full Two-Port Error-Correction Procedure Table 11-1 Calibration Coefficient Terms and Tests Calibration Coefficient Calibration Type Response 1-port 2-portb EX (ED) ED EDF 32 ET (ER) ES ESF 33 ER ERF 34 4 EXF 35 5 ELF 36 6 ETF 37 7 EDR 38 8 ESR 39 9 ERR 40 10 EXR 41 11 ELR 42 12 ETR 43 1 ER or ET Response and Isolationa Test Number 2 3 a.
Error Terms Full Two-Port Error-Correction Procedure Error Term Inspection NOTE If the correction is not active, press Cal 1. Press System SERVICE MENU TESTS 32 CORRECTION ON . x1 EXECUTE TEST . The analyzer copies the first calibration measurement trace for the selected error term into memory and then displays it. Table 11-1 lists the test numbers. 2. Press Scale Ref and adjust the scale and reference to study the error term trace. 3.
Error Terms Full Two-Port Error-Correction Procedure Error Term Descriptions The error term descriptions in this section include the following information: • significance of each error term • typical results following a full 2-port error-correction • guidelines to interpret each error term The same description applies to both the forward (F) and reverse (R) terms. Directivity (EDF and EDR) Description Directivity is a measure of any detected power that is reflected when a load is attached to the test port.
Error Terms Full Two-Port Error-Correction Procedure Source Match (ESF and ESR) Description Source match is a measure of test port connector match, as well as the match between all components from the source to the test port. These are the forward and reverse uncorrected source match terms of the driven port.
Error Terms Full Two-Port Error-Correction Procedure Reflection Tracking (ERF and ERR) Description Reflection tracking is the difference between the frequency response of the reference path (R path) and the frequency response of the reflection test path (A or B input path).
Error Terms Full Two-Port Error-Correction Procedure Isolation (Crosstalk, EXF and EXR) Description Isolation is a measure of the leakage between the test ports and the signal paths. The isolation error terms are characterized by measuring transmission (S21, S12) with loads attached to both ports during the error-correction procedure. Since these terms are low in magnitude, they are usually noisy (not very repeatable).
Error Terms Full Two-Port Error-Correction Procedure Load Match (ELF and ELR) Description Load match is a measure of the impedance match of the test port that terminates the output of a 2-port device. Load match error terms are characterized by measuring the reflection (S11, S22) responses of a “through” configuration during the calibration procedure.
Error Terms Full Two-Port Error-Correction Procedure Transmission Tracking (ETF and ETR) Description Transmission tracking is the difference between the frequency response of the reference path (including R input) and the transmission test path (including A or B input) while measuring transmission. The response of the test port cables is included. These terms are characterized by measuring the transmission (S21, S12) of the “through” configuration during the error-correction procedure.
12 Theory of Operation 12-1
Theory of Operation This chapter is divided into two major sections: • “How the Analyzer Works” gives a general description of the network analyzer operation. • “A Close Look at the Analyzer's Functional Groups” provides more detailed operating theory for each of the analyzer's functional groups.
Theory of Operation How the Analyzer Works How the Analyzer Works Network analyzers measure the reflection and transmission characteristics of devices and networks. A network analyzer test system consists of the following: • source • signal-separation devices • receiver • display The analyzer applies a signal that is either transmitted through the device under test, or reflected from its input, and then compares it with the incident signal generated by the swept RF source.
Theory of Operation How the Analyzer Works Test Sets Signal separation for the analyzer can be accomplished using any one of the following HP/Agilent accessories: • 85044A/B Transmission/Reflection Test Set • 85046A/B S-Parameter Test Set • 85047A S-Parameter Test Set • HP/Agilent Made Special Option Transmission/Reflection or S-Parameter Test Set • 86205A/86207A RF Bridge • 11667A Two-Way Power Splitter and 86205A RF Bridge Signal separation devices are needed to separate the incident signal from the tran
Theory of Operation A Close Look at the Analyzer's Functional Groups A Close Look at the Analyzer's Functional Groups The operation of the analyzer is most logically described in five functional groups. Each group consists of several major assemblies, and performs a distinct function in the instrument. Some assemblies are related to more than one group, and in fact all the groups are to some extent interrelated and affect each other's performance.
Theory of Operation Power Supply Theory Power Supply Theory The power supply functional group consists of the A15 preregulator and the A8 post regulator. These two assemblies comprise a switching power supply that provides regulated DC voltages to power all assemblies in the analyzer. The A15 preregulator is enclosed in a casting at the rear of the instrument behind the display. It is connected to the A8 post regulator by a wire bus A15W1.
Theory of Operation Power Supply Theory Preregulated Voltages The switching preregulator converts the line voltage to several DC voltages. The regulated +5 V digital supply goes directly to the motherboard. The following partially regulated voltages are routed through A15W1 to the A8 post regulator for final regulation: +70 V (not used) +25 V +18 V −18 V +8 V −8 V Regulated +5 V Digital Supply The +5 VD supply is regulated by the control circuitry in the A15 preregulator.
Theory of Operation Power Supply Theory Shutdown Circuit The shutdown circuit is triggered by overcurrent, overvoltage, undervoltage, or overtemperature. It protects the instrument by causing the regulated voltage supplies to be shut down. It also sends status messages to the A9 CPU to trigger warning messages on the analyzer display. The voltages that are not shut down are the +5 VD and +5 VCPU digital supplies from the preregulator, the fan supplies, the probe power supplies, and the display supplies.
Theory of Operation Digital Control Theory Digital Control Theory The digital control functional group consists of the following assemblies: • A1 front panel • A2 front panel processor • A9 CPU • A10 digital IF • A16 rear panel • A18 display • A19 GSP • A27 Inverter These assemblies combine to provide digital control for the entire analyzer and the 85047A or 85046A/B S-parameter test set.
Theory of Operation Digital Control Theory Figure 12-3 12-10 Digital Control Group, Simplified Block Diagram Chapter 12
Theory of Operation Digital Control Theory A1 Front Panel The A1 front panel assembly provides user interface with the analyzer. It includes the keyboard for local user inputs, and the front panel LEDs that indicate instrument status. The front panel knob is not electrically connected to the front panel, but provides user inputs directly to the front panel processor.
Theory of Operation Digital Control Theory EEPROM EEPROM (electrically-erasable programmable read only memory) contains factory set correction constants unique to each instrument. These constants correct for hardware variations to maintain the highest measurement accuracy. The correction constants can be updated by executing the routines in Chapter 3 , “Adjustments and Correction Constants.” Digital Signal Processor The digital signal processor receives the digitized data from the A10 digital IF.
Theory of Operation Digital Control Theory A27 Inverter The A27 backlight inverter assembly supplies the ac voltage for the backlight tube in the A18 display assembly. This assembly takes the +5 VCPU and converts it to approximately 380 Vac with 5 mA of current at 40 kHz. There are two control lines: • Digital ON/OFF • Analog Brightness — 100% intensity is 0 V — 50% intensity is 4.5 V A16 Rear Panel The A16 rear panel includes the following interfaces: • TEST SET I/O INTERCONNECT.
Theory of Operation Source Theory Overview Source Theory Overview The source produces a highly stable and accurate RF output signal by phase-locking a YIG oscillator to a harmonic of the synthesized VCO (voltage controlled oscillator). The source output produces a CW or swept signal between 300 kHz and 3 GHz (or 30 kHz and 6 GHz for Option 006) with a maximum leveled power of +20 dBm (or +18 dBm for Option 006) and a minimum power of −5 dBm.
Theory of Operation Source Theory Overview A3 Source This assembly includes a 3.0 to 6.8 GHz YIG oscillator and a 3.8 GHz cavity oscillator. The outputs of these oscillators are mixed to produce the RF output signal. In Option 006 (30 kHz to 6 GHz), the frequencies 3.0 to 6.0 GHz are no longer a mixed product, but are the direct output of the YIG oscillator. The signal tracks the stable output of the synthesizer. The ALC (automatic leveling control) circuitry is also in the A3 assembly.
Theory of Operation Source Super Low Band Operation Source Super Low Band Operation The Super Low Band Frequency Range is 10 kHz to 300 kHz. These frequencies are generated by the A12 reference board. They are the amplified output of the fractional-N synthesizer. This output is not phase locked and is not subject to ALC control. Refer to Table 12-1. Table 12-1 Super Low Band Subsweep Frequencies Fractional-N (MHz) 1st IF (MHz) RF Output (MHz) 40.0 to 43.3 0.010 to 0.300 0.010 to 0.
Theory of Operation Source Low Band Operation Source Low Band Operation The low band frequency range is 300 kHz to 16 MHz. These frequencies are generated by locking the A3 source to a reference signal. The reference signal is synthesized by mixing down the fundamental output of the fractional-N VCO with a 40 MHz crystal reference signal.
Theory of Operation Source Low Band Operation Figure 12-4 Low Band Operation of the Source The full low band is produced in two sub sweeps, to allow addition IF filtering below 3 MHz. At the transition between subsweeps, the source is pretuned and then relocks. Table 12-2 lists the low band subsweep frequencies at the fractional-N VCO and the RF output. Table 12-2 Low Band Subsweep Frequencies Fractional-N (MHz) 1st IF (MHz) Source Output (MHz) 40.3 to 43.3 0.3 to 3.3 0.3 to 3.3 43.3 to 56.0 3.
Theory of Operation Source High Band Operation Source High Band Operation The high band frequency range is 16 MHz to 3.0 GHz or 16 MHz to 6.0 GHz with Option 006. These frequencies are generated in subsweeps by phase-locking the A3 source signal to harmonic multiples of the fractional-N VCO. The high band subsweep sequence, illustrated in Figure 12-5, follows these steps: 1. A signal (HI OUT) is generated by the fractional-N VCO.
Theory of Operation Source High Band Operation 7. A synthesized subsweep is generated by A13/A14. The A3 source tracks the synthesizer. When the source is phase locked to the synthesizer at the start frequency, the synthesizer starts to sweep. The phase locked loop forces the source to track the synthesizer, maintaining a constant 1 MHz 1st IF signal. The full high band sweep is generated in a series of subsweeps, by phase locking the A3 source signal to harmonic multiples of the fractional-N VCO.
Theory of Operation Source High Band Operation Table 12-3 High Band Subsweep Frequencies Fractional-N (MHz) Harmonic Source Output (MHz) 30 to 60 1/2 16 to 31 30 to 60 1 31 to 61 30 to 60 2 61 to 121 40 to 59 3 121 to 178 35.4 to 59.2 5 178 to 296 32.8 to 59.4 9 296 to 536 35.7 to 59.5 15 536 to 893 33.0 to 59.5 27 893 to 1607 31.5 to 58.8 51 1607 to 3000 Option 006 37.0 to 59.6 83 3000 to 4950 49.0 to 59.
Theory of Operation Source Operation in Other Modes/Features Source Operation in Other Modes/Features Besides the normal network analyzer mode, the analyzer has extra modes and features to make additional types of measurements. The following describes the key differences in how the analyzer operates to achieve these new measurements. Frequency Offset The analyzer can measure frequency-translating devices with the frequency offset feature. The receiver operates normally.
Theory of Operation Source Operation in Other Modes/Features Figure 12-6 Chapter 12 Harmonic Analysis 12-23
Theory of Operation Source Operation in Other Modes/Features External Source Mode In external source mode, the analyzer phase locks its receiver to an external signal source. This source must be CW (not swept), but it does not need to be synthesized. The user must enter the source frequency into the analyzer. (The analyzer's internal source output is not used.
Theory of Operation Source Operation in Other Modes/Features Tuned Receiver Mode In tuned receiver mode, the analyzer is a synthesized, swept, narrow-band receiver only. The external signal source must be synthesized and reference-locked to the analyzer. To achieve this, the analyzer's source and phase lock circuits are completely unused. See Figure 12-8. The fractional-N synthesizer is tuned so that one of its harmonics (1st LO) down-converts the RF input to the samplers.
Theory of Operation Signal Separation Signal Separation External Test Sets The HP/Agilent 85047A S-parameter test set contains a switched frequency doubler to double the analyzer’s source frequency. A portion of the RF signal is coupled to the analyzer R input for reference. (For analyzers with Option 006, the frequency doubler is bypassed since the analyzer's source is capable of generating a swept RF signal up to 6 GHz.
Theory of Operation Signal Separation Figure 12-9 Chapter 12 Test Set Block Diagrams 12-27
Theory of Operation Receiver Theory Receiver Theory The receiver functional group consists of the following assemblies: • A4 sampler/mixer • A5 sampler/mixer • A6 sampler/mixer • A10 digital IF These assemblies combine with the A9 CPU (described in “Digital Control Theory” on page 12-9) to measure and process input signals into digital information for display on the analyzer. Figure 12-10 is a simplified block diagram of the receiver functional group.
Theory of Operation Receiver Theory A4/A5/A6 Sampler/Mixer The A4, A5, and A6 sampler/mixers all down-convert the RF input signals to fixed 4 kHz 2nd IF signals with amplitude and phase corresponding to the RF input. The Sampler Circuit in High Band In high band operation, the sampling rate of the samplers is controlled by the 1st LO from the A7 pulse generator assembly. The 1st LO is a comb of harmonics produced by a step recovery diode driven by the fractional-N VCO fundamental signal.
Theory of Operation Receiver Theory The Mixer Circuit The 1st IF and the 2nd LO are combined in the mixer circuit. The resulting difference frequency (the 2nd IF) is a constant 4 kHz in both bands, as shown in Table 12-4. Table 12-4 Mixer Frequencies Band 1st IF 2nd LO 2nd IF Super Lowa 0.010 to 0.300 MHz 0.014 to 0.304 MHz 4.0 kHz Low 0.300 to 16.0 MHz 0.304 to 16.004 MHz 4.0 kHz High 1.000 MHz 0.996 MHz 4.0 kHz a. Analyzers with Option 006 only.
13 Replaceable Parts 13-1
Replaceable Parts Replaceable Parts Replaceable Parts This chapter contains information for ordering replacement parts for the analyzer. Replaceable parts include the following: • major assemblies • cables • chassis hardware In general, lower-level parts of major assemblies are not listed. Refer to Table 13-1 on page 40 at the back of this chapter to help interpret part descriptions in the replaceable parts lists that follow.
Replaceable Parts Replacing an Assembly Replacing an Assembly The following steps show the sequence to replace an assembly in the analyzer. 1. Identify the faulty group. Refer to Chapter 4 , “Start Troubleshooting Here.” Follow up with the appropriate troubleshooting chapter that identifies the faulty assembly. 2. Order a replacement assembly. Refer to the information in this chapter. 3. Replace the faulty assembly and determine what adjustments are necessary.
Replaceable Parts Rebuilt-Exchange Assemblies Rebuilt-Exchange Assemblies Under the rebuilt-exchange assembly program, certain factory-repaired and tested modules (assemblies) are available on a trade-in basis. These assemblies are offered for lower cost than a new assembly, but meet all factory specifications required of a new assembly. The defective assembly must be returned for credit under the terms of the rebuilt-exchange assembly program.
Replaceable Parts Ordering Information Ordering Information To order a part listed in the replaceable parts lists, quote the part number, indicate the quantity required, and address the order to the nearest Agilent Technologies office. To order a part that is not listed in the replaceable parts lists, include the instrument model number, complete instrument serial number, the description and function of the part, and the number of parts required.
Replaceable Parts Ordering Information Figure 13-1 13-6 Module Exchange Program Chapter 13
Replaceable Parts Replaceable Part Listings Replaceable Part Listings The following pages list the replacement part numbers and descriptions for the analyzer. Illustrations with reference designators are provided to help identify and locate the part needed.
Replaceable Parts Replaceable Part Listings Major Assemblies, Top Ref. Desig.
Replaceable Parts Replaceable Part Listings Figure 13-2 Chapter 13 Major Assemblies, Top 13-9
Replaceable Parts Replaceable Part Listings Major Assemblies, Bottom Ref. Desig. HP/Agilent Part Number Qty A9 08753-60315 1 CPU REPAIR KIT (EXCHANGE: 08753-69315) CPU FAN 5060-8776 1 A9 CPU FAN A9BT1 1420-0338 1 BATTERY-LITHIUM 3V 1.
Replaceable Parts Replaceable Part Listings This page intentionally left blank.
Replaceable Parts Replaceable Part Listings Cables, Top Ref. Desig.
Replaceable Parts Replaceable Part Listings Figure 13-4 Cables, Top Cable connections for A7 Pulse Generators produced after 01 July 2004.
Replaceable Parts Replaceable Part Listings Cables, Bottom Ref. Desig. Typea 1 HP/Agilent Part Number Qty Description 1400-0611 1 CABLE CLAMP W20 34R 8120-6890 1 MOTHERBOARD (A17J11) to CPU (A9J5) W37 26R 8120-8670 1 DISK DRIVE (A20) to CPU (A9J15) a.
Replaceable Parts Replaceable Part Listings Cables, Front Ref. Desig.
Replaceable Parts Replaceable Part Listings Cables, Rear Ref. Desig.
Replaceable Parts Replaceable Part Listings Cables, Source Ref. Desig. Typea HP/Agilent Part Number Qty Description A3A2W1 10R 08753-60034 1 EYO (A3A3) to ALC (A3A2J3) A3A4W1 4W 08753-60035 1 CAVITY OSC (A3A4) to ALC (A3A2J2) A3W1 SR 08753-20107 1 EYO (A3A3) to SOURCE ASSEMBLY (A3) A3W2 SR 08753-20032 1 CAVITY OSC (A3A4) to SOURCE ASSEMBLY (A3) A3W7 SR 08753-20110 1 SOURCE ASSEMBLY (A3) to W1 a.
Replaceable Parts Replaceable Part Listings Front Panel Assembly, Outside Ref. Desig. HP/Agilent Part Number Qty 1 08753-80169 1 OVERLAY, LOWER FRONT PANEL 2 08753-60939 1 FRONT PANEL REPAIR KIT a 3 1510-0038 1 GROUND POST 4 2950-0006 1 NUT HEX 1/4-32 4 2190-0067 1 WASHER LK .
Replaceable Parts Replaceable Part Listings This page intentionally left blank.
Replaceable Parts Replaceable Part Listings Front Panel Assembly, Inside Ref. Desig. Opt HP/Agilent Part Number Qty 1 08753-00150 1 DISPLAY HOLD DOWN 2 2090-0386 1 DISPLAY LAMP 3 1000-0995 1 DISPLAY GLASS 7 1990-1864 1 RPG (INCLUDES CABLE AND HARDWARE) 8 E4400-40003 1 RPG KNOB 9 08720-40016 1 FLUBBER KEYPAD 10 0515-0430 8 SCREW SM 3.0 6CWPNTX 11 0515-0665 4 SCREW SMM 3.0 14CWPNTX 12 1400-1439 2 CABLE CLIP 13 0515-0372 3 SCREW SMM 3.
Replaceable Parts Replaceable Part Listings Figure 13-10 Chapter 13 Front Panel Assembly, Inside 13-21
Replaceable Parts Replaceable Part Listings Rear Panel Assembly Ref. Desig. Typea HP/Agilent Part Number Qty 1 34R 8120-6407 1 RP INTERFACE (A16J4) TO MB (A17J6) (W27) 3 08720-60138 1 BOARD ASSEMBLY-REAR PANEL INTERFACE (A16) 4 08753-60026 1 ASSEMBLY-EXTERNAL REFERENCE CABLE (W13) 5 08415-60036 1 ASSEMBLY-FAN 6 1251-2942 4 FASTENER CONN RP LOCK 7 2190-0034 2 WASHER LK .194ID10 7 0380-0644 2 NUT STDF .
Replaceable Parts Replaceable Part Listings Figure 13-11 Chapter 13 Rear Panel Assembly 13-23
Replaceable Parts Replaceable Part Listings Rear Panel Assembly, Option 1D5 Ref. Desig. Option HP/Agilent Part Number Qty Description 1 1D5 1250-1859 1 ADAPTER-COAX 2 1D5 0515-0374 1 SCREW-MACHINE M3.0×10 CW-PN-TX 3 1D5 3050-1546 1 WASHER-FLAT .505ID NY 4 1D5 2190-0068 1 WASHER-LOCK .505ID 5 1D5 2950-1310 1 NUT-SPECIALTY 1/2-28 6 1D5 0515-0430 1 SCREW-MACHINE M3.
Replaceable Parts Replaceable Part Listings Figure 13-12 Chapter 13 Rear Panel Assembly, Option 1D5 13-25
Replaceable Parts Replaceable Part Listings Hardware, Top Ref. Desig. HP/Agilent Part Number Qty 1 0515-2799 2 SCREW-MACHINE M3.0×10 CW-FL-TX 2 08753-40014 1 STABILIZER-PC BOARD 3 08753-20062 1 STABILIZER CAP 4 0515-2035 1 SCREW-MACHINE M3.0×16 PC-FL-TX 5 0515-0458 2 SCREW-MACHINE M3.5×8 CW-PN-TX 6 08753-00107 1 AIR FLOW COVER 7 0515-0374 2 SCREW-MACHINE M3.0 X 10 CW-PN-TX 8 0515-0377 2 SCREW-MACHINE M3.5×10 CW-PN-TX 9 0515-0374 2 SCREW-MACHINE M3.
Replaceable Parts Replaceable Part Listings Figure 13-13 Chapter 13 Hardware, Top 13-27
Replaceable Parts Replaceable Part Listings Hardware, Bottom Ref. Desig. HP/Agilent Part Number Qty 1 0515-0458 4 SCREW-MACHINE M3.5×8 CW-PN-TX 2 0515-0430 3 SCREW-MACHINE M3.0×6 CW-PN-TX 3 0515-0458 1 SCREW-MACHINE M3.5×8 CW-PN-TX 4 0515-0375 1 SCREW-MACHINE M3.0×16 CW-PN-TX 5 08753-00139 1 SUPPORT BRACKET 6 0515-1400 4 SCREW-MACHINE M3.
Replaceable Parts Replaceable Part Listings Hardware, Front Ref. Desig. Option HP/Agilent Part Number Qty 1 08753-00137 1 BRACKET-CABLE SUPPORT 2 0515-0665 1 SCREW -MACHINE 3.
Replaceable Parts Replaceable Part Listings Hardware, Type-N Connector Assembly Ref. Desig. HP/Agilent Part Number Qty 1 86290-60005 4 CONNECTOR ASSEMBLY TYPE-N 2 08753-00140 1 BRACKET-MOUNT OPTION O11 3 2190-0104 4 WASHER-LOCK .
Replaceable Parts Replaceable Part Listings Hardware, Disk Drive Support Ref. Desig. HP/Agilent Part Number Qty 1 0515-1048 4 SCREW-M 2.5X4 SOCKET HEAD, HEX. 2 08753-00152 1 DISK DRIVE BRACKET 3 0515-0374 4 SCREWS -MACHINE M 3.
Replaceable Parts Replaceable Part Listings Hardware, Memory Deck Ref. Desig. HP/Agilent Part Number Qty 1 0515-0458 4 SCREW-MACHINE M3.5×8 CW-PN-TX 2 0515-0430 2 SCREW-MACHINE M3.0×6 CW-PN-TX 3 0515-0375 1 SCREW-MACHINE M3.
Replaceable Parts Replaceable Part Listings Hardware, Preregulator Ref. Desig. HP/Agilent Part Number Qty 1 2110-1059 1 FUSE, T 5A 125V, UL LISTED/CSA CERTIFIED TO 248 STANDARD (for 115V operations) 2110-1036 1 FUSE, T 4A H 250V, BUILT TO IEC127-2/5 STANDARD (for 230V operations) 2 08753-00065 1 BRACKET-PREREGULATOR 3 0515-1400 2 SCREW-MACHINE M3.
Replaceable Parts Replaceable Part Listings Chassis Parts, Outside Ref. Desig. HP/Agilent Part Number Qty 1 5041-9176 1 TRIM STRIP 2 08720-00078 1 COVER-TOP 3 5041-9188 4 REAR STANDOFF 4 0515-1402 4 SCREW SMM 3.5 8 PCPNTX 5 5041-9187 2 REAR CAP-SIDE STRAP 6 0515-1384 4 SCREW SMM 5.
Replaceable Parts Replaceable Part Listings Figure 13-20 Chapter 13 Chassis Parts, Outside 13-35
Replaceable Parts Replaceable Part Listings Chassis Parts, Inside Ref. Desig. HP/Agilent Part Number Qty Description 1 5022-1190 1 FRONT PANEL FRAME 2 5021-5808 1 REAR FRAME 3 08753-60936 1 ASSEMBLY-CARDCAGE/MOTHER 4 0515-2086 16 SCREW SMM4.0×7 PCFLTX 5 0515-0430 1 SCREW M3.0×6 CWPNTXa 6 08720-00083 1 INSULATOR SWITCHa 7 1460-1573 1 SPRING EXTENSION .138 OD 8 08720-00077 1 SWITCH RODa 9 0515-1400 1 SMM 3.5×8 PCFLTX A17 08753-60360 1 BOARD ASSEMBLY-MOTHERBOARD a.
Replaceable Parts Replaceable Part Listings Miscellaneous Description HP/Agilent Part Number Service Tools 8753 TOOL KIT includes the following: 08753-60023 RF CABLE-INPUT R 08753-20028 EXTENDER BOARD ASSEMBLY-RECEIVER 08753-60019 EXTENDER BOARD ASSEMBLY-SOURCE 08753-60020 EXTENDER BOARD ASSEMBLY-CARD CAGE 08753-60155 EXTENDER BOARD ASSEMBLY-GSP 08753-60309 ADAPTER-MALE SMB TO MALE SMB 1250-0669 ADAPTER-MALE TYPE N TO FEMALE SMA 1250-1250 CABLE ASSEMBLY 5061-1022 BAG-ANTISTATIC 13×15 9
Replaceable Parts Replaceable Part Listings Description HP/Agilent Part or Model Number Agilent 8753ET Upgrade Kits HARMONIC MEASUREMENT UPGRADE KIT 8753ETU OPT 002 STEP ATTENUATOR UPGRADE KIT 8753ETU OPT 004 6 GHz UPGRADE KIT 8753ETU OPT 006 TIME DOMAIN UPGRADE KIT 8753ETU OPT 010 FIRMWARE UPGRADE KIT 8753ETU OPT 099 HIGH-STABILITY FREQUENCY REFERENCE RETROFIT KIT 8753ETU OPT 1D5 Agilent 8753ES Upgrade Kits HARMONIC MEASUREMENT UPGRADE KIT 8753ESU OPT 002 6 GHz UPGRADE KIT 8753ESU OPT 006
Replaceable Parts Replaceable Part Listings Description HP/Agilent Part or Model Number Fuses used on the A8 Post Regulator FUSE 0.5A 125V NON-TIME DELAY 0.25×0.27 2110-0046 FUSE 0.75A 125V NON-TIME DELAY 0.25×0.27 2110-0424 FUSE 1A 125V NON-TIME DELAY 0.25×0.27 2110-0047 FUSE 2A 125V NON-TIME DELAY 0.25×0.27 2110-0425 FUSE 4A 125V NON-TIME DELAY 0.25×0.27 2110-0476 For Line Fuse part numbers, refer to “Hardware, Preregulator” on page 13-33. GPIB Cables GPIB CABLE, 1M (3.
Replaceable Parts Replaceable Part Listings Table 13-1 Abbreviation Definitions REFERENCE DESIGNATIONS LCD........................................liquid crystal display A................................................................Assembly LED.........................................light-emitting diode B...............................................................fan; motor M...................................................................meters J..........
14 Assembly Replacement and Post-Repair Procedures 14-1
Assembly Replacement and Post-Repair Procedures This chapter contains procedures for removing and replacing the major assemblies of the analyzer. A table showing the corresponding post-repair procedures for each replaced assembly is located at the end of this chapter.
Assembly Replacement and Post-Repair Procedures Replacing an Assembly Replacing an Assembly The following steps show the sequence to replace an assembly in the analyzer. 1. Identify the faulty group. Refer to Chapter 4 , “Start Troubleshooting Here.” Follow up with the appropriate troubleshooting chapter that identifies the faulty assembly. 2. Order a replacement assembly. Refer to Chapter 13 , “Replaceable Parts.” 3. Replace the faulty assembly and determine what adjustments are necessary.
Assembly Replacement and Post-Repair Procedures Replacing an Assembly Procedures described in this chapter The following pages describe assembly replacement procedures for the analyzer assemblies listed below: • Line Fuse on page 14-5 • Covers on page 14-6 • Front Panel Assembly on page 14-8 • Front Panel Keyboard and Interface Assemblies (A1, A2) on page 14-10 • Display, Display Lamp and Inverter Assemblies (A18, A27) on page 14-12 • Rear Panel Assembly on page 14-14 • Rear Panel Interface Board Assembly
Assembly Replacement and Post-Repair Procedures Line Fuse Line Fuse Tools Required • small slot screwdriver Removal WARNING For continued protection against fire hazard, replace line fuse only with same type and rating (115 V operation: T 5A 125V UL/CSA; 230V operation: T 4A H 250V IEC). The use of other fuses or materials is prohibited. 1. Refer to Figure 14-1. 2. Disconnect the power cord. 3. Use a small slot screwdriver to pry open the fuse holder. 4.
Assembly Replacement and Post-Repair Procedures Covers Covers Tools Required • T-10 TORX screwdriver • T-15 TORX screwdriver • T-20 TORX screwdriver • T-25 TORX screwdriver Refer to Figure 14-2 when performing the following procedures. Removing the top cover 1. Remove both upper rear feet (item 1) by loosening the attaching screws (item 2). 2. Loosen the top cover screw (item 3). 3. Slide the cover back and off. Removing the side covers 1. Remove the top cover. 2.
Assembly Replacement and Post-Repair Procedures Covers Figure 14-2 Chapter 14 Covers 14-7
Assembly Replacement and Post-Repair Procedures Front Panel Assembly Front Panel Assembly Tools Required • T-10 TORX screwdriver • T-15 TORX screwdriver • small slot screwdriver • ESD (electrostatic discharge) grounding wrist strap • 5/16-inch open-end torque wrench (set to 10 in-lb) Refer to Figure 14-3 when performing the following procedures. Removal 1. Disconnect the power cord. 2. Remove the front bottom feet (item 1). 3. Remove the line button (item 5) by pulling it out. 4.
Assembly Replacement and Post-Repair Procedures Front Panel Assembly Figure 14-3 Chapter 14 Front Panel Assembly 14-9
Assembly Replacement and Post-Repair Procedures Front Panel Keyboard and Interface Assemblies (A1, A2) Front Panel Keyboard and Interface Assemblies (A1, A2) Tools Required • T-10 TORX screwdriver • T-15 TORX screwdriver • small slot screwdriver • ESD (electrostatic discharge) grounding wrist strap • 5/16-inch open-end torque wrench (set to 10 in-lb) Removal 1. Remove the front panel assembly from the analyzer (refer to “Front Panel Assembly” on page 14-8). 2. Refer to Figure 14-4.
Assembly Replacement and Post-Repair Procedures Front Panel Keyboard and Interface Assemblies (A1, A2) Figure 14-4 Chapter 14 Front Panel Keyboard and Interface Assemblies 14-11
Assembly Replacement and Post-Repair Procedures Display, Display Lamp and Inverter Assemblies (A18, A27) Display, Display Lamp and Inverter Assemblies (A18, A27) Tools Required • T-10 TORX screwdriver • T-15 TORX screwdriver • small slot screwdriver • ESD (electrostatic discharge) grounding wrist strap • #0 Phillips Screwdriver Removal 1. Remove the front panel assembly (refer to “Front Panel Assembly” on page 14-8). 2. Refer to Figure 14-5.
Assembly Replacement and Post-Repair Procedures Display, Display Lamp and Inverter Assemblies (A18, A27) CAUTION Be sure that cables are plugged in square and correct. Failure to do so will result in serious component damage. CAUTION Do not exceed 10 in-lb when replacing the display hold-down plate screws.
Assembly Replacement and Post-Repair Procedures Rear Panel Assembly Rear Panel Assembly Tools Required • T-10 TORX screwdriver • T-15 TORX screwdriver • ESD (electrostatic discharge) grounding wrist strap Removal 1. Disconnect the power cord and remove the top (item 1) and bottom covers (refer to “Covers” on page 14-6). 2. Refer to Figure 14-6. Remove the four rear standoffs (item 2). 3. If the analyzer has option 1D5, remove the BNC jumper from the high stability frequency reference (item 3). 4.
Assembly Replacement and Post-Repair Procedures Rear Panel Assembly Figure 14-6 Chapter 14 Rear Panel Assembly 14-15
Assembly Replacement and Post-Repair Procedures Rear Panel Interface Board Assembly (A16) Rear Panel Interface Board Assembly (A16) Tools Required • 9/16 hex nut driver • 3/16 hex nut driver • T-10 TORX screwdriver • T-15 TORX screwdriver • ESD (electrostatic discharge) grounding wrist strap Removal 1. Disconnect the power cord and remove the top and bottom covers (refer to “Covers” on page 14-6). 2. If the analyzer has option 1D5, remove the high-stability frequency reference jumper (item 1). 3.
Assembly Replacement and Post-Repair Procedures Rear Panel Interface Board Assembly (A16) Figure 14-7 Chapter 14 Rear Panel Interface Board Assembly 14-17
Assembly Replacement and Post-Repair Procedures Type-N Connector Assembly Type-N Connector Assembly Tools Required • T-10 TORX screwdriver • T-15 TORX screwdriver • small slot screwdriver • ESD (electrostatic discharge) grounding wrist strap • 5/16-inch open-end torque wrench (set to 10 in-lb) Removal 1. Disconnect the power cord. 2. Remove the front panel (refer to “Front Panel Assembly” on page 14-8). 3. Remove the right-side trim strip (item 1) from the front frame.
Assembly Replacement and Post-Repair Procedures Type-N Connector Assembly Figure 14-8 Chapter 14 Type-N Connector Assembly 14-19
Assembly Replacement and Post-Repair Procedures A3 Source Assembly A3 Source Assembly Tools Required • T-15 TORX screwdriver • 5/16-inch open-end torque wrench (set to 10 in-lb) • ESD (electrostatic discharge) grounding wrist strap Removal 1. Disconnect the power cord and remove the top cover (refer to “Covers” on page 14-6). 2. Remove the source bracket (item 1) by removing four screws. (It might be necessary to disconnect a flexible cable from the B sampler.) 3. Disconnect the semirigid cable W1. 4.
Assembly Replacement and Post-Repair Procedures A3 Source Assembly Figure 14-9 Chapter 14 Source Assembly, A3 14-21
Assembly Replacement and Post-Repair Procedures A4, A5, A6 Samplers and A7 Pulse Generator A4, A5, A6 Samplers and A7 Pulse Generator Tools Required • Needle-nose pliers • T-10 TORX screwdriver • 5/16-inch open-end torque wrench (set to 10 in-lb) • ESD (electrostatic discharge) grounding wrist strap Removal 1. Disconnect the power cord and remove the top cover (refer to “Covers” on page 14-6). 2. To remove the B sampler (A6), you must remove the source bracket (item 1). 3.
Assembly Replacement and Post-Repair Procedures A4, A5, A6 Samplers and A7 Pulse Generator Figure 14-10 A4, A5, A6 Samplers and A7 Pulse Generator Cable connections for A7 Pulse Generators produced after 01 July 2004.
Assembly Replacement and Post-Repair Procedures A8, A10, A11, A12, A13, A14 Card Cage Boards A8, A10, A11, A12, A13, A14 Card Cage Boards Tools Required • T-10 TORX screwdriver • T-15 TORX screwdriver • ESD (electrostatic discharge) grounding wrist strap Removal 1. Disconnect the power cord and remove the top cover (refer to “Covers” on page 14-6). 2. Remove the screw from the pc board stabilizer and remove the stabilizer. 3. Lift the two extractors located at each end of the board.
Assembly Replacement and Post-Repair Procedures A8, A10, A11, A12, A13, A14 Card Cage Boards Figure 14-11 Chapter 14 Card Cage Boards: A8, A10, A11, A12, A13, A14 14-25
Assembly Replacement and Post-Repair Procedures A9 CPU Board A9 CPU Board Tools Required • T-10 TORX screwdriver • T-15 TORX screwdriver • ESD (electrostatic discharge) grounding wrist strap Removal 1. Disconnect the power cord. 2. Remove the top and bottom covers (refer to “Covers” on page 14-6). 3. Remove the rear panel assembly, following steps 2 through 6 of “Rear Panel Assembly” on page 14-14. 4. Turn the analyzer upside down. 5. Pull the rear panel away from the frame. 6.
Assembly Replacement and Post-Repair Procedures A9 CPU Board Figure 14-12 Chapter 14 A9 CPU Board 14-27
Assembly Replacement and Post-Repair Procedures A9BT1 Battery A9BT1 Battery Tools Required • T-10 TORX screwdriver • ESD (electrostatic discharge) grounding wrist strap • soldering iron with associated soldering tools Removal 1. Remove the A9 CPU board (refer to “A9 CPU Board” on page 14-26). 2. Unsolder and remove A9BT1 from the A9 CPU board. WARNING Battery A9BT1 contains lithium. Do not incinerate or puncture this battery. Dispose of the discharged battery in a safe manner. Replacement 1.
Assembly Replacement and Post-Repair Procedures A9BT1 Battery Figure 14-13 Chapter 14 A9BT1 Battery 14-29
Assembly Replacement and Post-Repair Procedures A15 Preregulator A15 Preregulator Tools Required • T-10 TORX screwdriver • T-15 TORX screwdriver • ESD (electrostatic discharge) grounding wrist strap Removal 1. Remove the rear panel (refer to “Rear Panel Assembly” on page 14-14). 2. Remove the two remaining screws from the top of the rear frame. 3. Disconnect the wire bundle (A15W1) from A8J2 and A17J3. 4. Remove the preregulator (A15) from the frame. Replacement 1.
Assembly Replacement and Post-Repair Procedures A15 Preregulator Figure 14-14 Chapter 14 A15 Preregulator 14-31
Assembly Replacement and Post-Repair Procedures A17 Motherboard Assembly A17 Motherboard Assembly Tools Required • T-10 TORX screwdriver • T-15 TORX screwdriver • T-20 TORX screwdriver • small slot screwdriver • 2.5-mm hex-key driver • 5/16-inch open-end torque wrench (set to 10 in-lb) • ESD (electrostatic discharge) grounding wrist strap Removal To remove the A17 motherboard assembly only, perform the following steps to remove all assemblies and cables that connect to the motherboard. 1.
Assembly Replacement and Post-Repair Procedures A17 Motherboard Assembly Figure 14-15 Chapter 14 A17 Motherboard Assembly 14-33
Assembly Replacement and Post-Repair Procedures A17 Motherboard Assembly To remove the A17 motherboard assembly along with the card cage, continue with the following step: 13.Refer to Figure 14-16. Remove the front frame (item 1) and rear frame (item 6) by removing the attaching screws (item 7). At this point, only the motherboard/card cage assembly should remain. This whole assembly is replaceable. Figure 14-16 A17 Motherboard and Card Cage Assembly Replacement 1.
Assembly Replacement and Post-Repair Procedures A19 Graphics Processor A19 Graphics Processor Tools Required • T-10 TORX screwdriver • T-15 TORX screwdriver • ESD (electrostatic discharge) grounding wrist strap Removal 1. Disconnect the power cord. 2. Remove the top cover (refer to “Covers” on page 14-6) and front panel (refer to “Front Panel Assembly” on page 14-8). 3. Remove the six screws (item 1) from the GSP cover (item 2) and lift off. 4.
Assembly Replacement and Post-Repair Procedures A20 Disk Drive Assembly A20 Disk Drive Assembly Tools Required • T-8 TORX screwdriver • T-10 TORX screwdriver • T-15 TORX screwdriver • T-25 TORX screwdriver • #2 ball-end hex driver with long shaft • ESD (electrostatic discharge) grounding wrist strap • 3.5” diskette Removal 1. Disconnect the power cord and remove the top, bottom, and left side covers (“Covers” on page 14-6).
Assembly Replacement and Post-Repair Procedures A20 Disk Drive Assembly Figure 14-18 Chapter 14 A20 Disk Drive Assembly 14-37
Assembly Replacement and Post-Repair Procedures A20 Disk Drive Assembly A20 Disk Drive Assembly Replacement 1. Attach the plug (item 4) to the replacement disk drive. 2. Attach the disk drive bracket to the replacement disk drive as shown. Leave the three screws loose in case the disk drive ’s position needs to be adjusted. NOTE Place the disk drive on a horizontal and flat surface when attaching the bracket. This minimizes distortion of the disk drive. 3.
Assembly Replacement and Post-Repair Procedures A20 Disk Drive Assembly Test the disk-eject function, and adjust if required. 1. Insert a diskette into the disk drive and then eject the disk. 2. If the diskette does not eject properly, loosen and then retighten the three screws that hold the disk drive to the disk drive bracket: a. Loosen the three screws that are readily accessible. b. Loosen the upper-most front screw through the screw hole left empty in step 7 on page 14-38. c.
Assembly Replacement and Post-Repair Procedures High Stability Frequency Reference (Option 1D5) Assembly High Stability Frequency Reference (Option 1D5) Assembly Tools Required • T-10 TORX screwdriver • T-15 TORX screwdriver • 9/16-inch hex-nut driver • ESD (electrostatic discharge) grounding wrist strap Removal 1. Remove the rear panel (refer to “Rear Panel Assembly” on page 14-14). 2. Disconnect W30 from the high stability frequency reference board (A26). 3.
Assembly Replacement and Post-Repair Procedures High Stability Frequency Reference (Option 1D5) Assembly Figure 14-19 Chapter 14 A26 High Stability Frequency Reference (Option 1D5) Assembly 14-41
Assembly Replacement and Post-Repair Procedures B1 Fan Assembly B1 Fan Assembly Tools Required • 2.5-mm hex-key driver • T-10 TORX screwdriver • T-15 TORX screwdriver • ESD (electrostatic discharge) grounding wrist strap Removal 1. Remove the rear panel (refer to “Rear Panel Assembly” on page 14-14). 2. Remove the four screws (item 1) that secure the fan and fan cover to the rear panel. Replacement 1. Reverse the order of the removal procedure.
Assembly Replacement and Post-Repair Procedures Post-Repair Procedures Post-Repair Procedures Table 3-1 on page 3-3 lists the additional service procedures that must be performed to ensure that the analyzer is working correctly, following the replacement of an assembly. Perform the procedures in the order that they are listed in the table.
Assembly Replacement and Post-Repair Procedures Post-Repair Procedures 14-44 Chapter 14
15 Safety and Regulatory Information 15-1
Safety and Regulatory Information General Information General Information Maintenance Clean the cabinet, using a dry or damp cloth only. WARNING To prevent electrical shock, disconnect the analyzer from mains before cleaning. Use a dry cloth or one slightly dampened with water to clean the external case parts. Do not attempt to clean internally. Lithium Battery Disposal If the battery on the CPU board (A9) needs to be disposed of, dispose of it in accordance with your country’s requirements.
Safety and Regulatory Information General Information Contacting Agilent Online assistance: www.agilent.
Safety and Regulatory Information Instrument Markings Instrument Markings The instruction documentation symbol. The product is marked with this symbol when it is necessary for the user to refer to the instructions in the documentation. The CE mark is a registered trademark of the European Community. (If accompanied by a year, it is when the design was proven.) The CSA mark is a registered trademark of the Canadian Standards Association.
Safety and Regulatory Information Safety Symbols Safety Symbols The following safety symbols are used throughout this manual. Familiarize yourself with each of the symbols and its meaning before operating this instrument. CAUTION Caution denotes a hazard. It calls attention to a procedure that, if not correctly performed or adhered to, would result in damage to or destruction of the instrument. Do not proceed beyond a caution note until the indicated conditions are fully understood and met.
Safety and Regulatory Information Safety Considerations Before Applying Power CAUTION The front panel LINE switch disconnects the mains circuits from the mains supply after the EMC filters and before other parts of the instrument. CAUTION Before switching on this instrument, make sure that the analyzer line voltage selector switch is set to the voltage of the power supply and the correct fuse is installed.
Safety and Regulatory Information Safety Considerations Servicing WARNING No operator serviceable parts inside. Refer servicing to qualified personnel. To prevent electrical shock, do not remove covers. WARNING These servicing instructions are for use by qualified personnel only. To avoid electrical shock, do not perform any servicing unless you are qualified to do so. WARNING The opening of covers or removal of parts is likely to expose dangerous voltages.
Safety and Regulatory Information Safety Considerations 15-8 Chapter 15
Index Symbols +0.37 V reference, 10-29 +2.
Index display lamp, 14-12 keypad, 14-10 rear panel, 14-14 attenuation voltage matrix, 9-10 aux input (rear panel auxiliary input), 10-29 available options, 1-6 B B1 fan assembly, 14-42 background intensity check for display, 6-7 backup EEPROM disk, 3-33 band (high/low) transition adjustment, 3-45 battery, 14-28 block diagram, 4-21 digital control group, 6-3 receiver, 12-28 simplified, 5-4 C cable inspection, 6-15 cable locations,power supply, 5-9 cable test, 9-6 cables, 13-14, 13-15, 13-16 rear view, 13-16
Index equipment cavity oscillator frequency adjustment, 3-25 display intensity correction constants adjustment, 6-7 EEPROM backup disk procedure, 3-33 fractional-N frequency range adjustment, 3-39 spur avoidance and FM sideband adjustment, 3-47 frequency accuracy adjustment, 3-42 IF amplifier correction constants adjustment, 3-16 required, 1-2 RF output power correction constants adjustment, 3-11 sampler magnitude adjustment, 3-19 source spur avoidance tracking adjustment, 3-50 error messages, 5-17, 10-44
Index the fractional-N frequency range adjustment, 3-53 the fractional-N spur avoidance and FM sideband adjustment, 3-54 troubleshoot digital control group, 6-1 receiver, 8-1 source group, 7-1 I IF amplifier correction constants adjustment, 3-16 IF Det 1, 10-35 IF Det 2N, 10-34 IF Det 2W, 10-34 information,ordering, 13-5 initialize EEPROMs, 3-32 input impedance test, 2-42 input traces A and B check, 8-4 inspect cables, 6-15 instrument markings, 15-4 intermittent problems, 5-20 internal diagnostic menus, 10
Index receiver phase compression, 2-62 receiver phase frequency response (ratio), 2-27 receiver trace noise, 2-38 source and receiver harmonics, 2-66 source frequency range and accuracy, 2-4 source power range, linearity, and accuracy, 2-6 peripheral GPIB addresses, 4-8 peripheral troubleshooting, 4-9 phase compression test, 2-62 phase frequency response (ratio) test, 2-27 phase lock, 10-29 A11 check, 7-28 and A3 source check, 7-8 error, 7-6 error messages, 7-30 reference, 10-37 PHASE LOCK CAL FAILED, 7-30
Index upgrade kits, 13-37 replacement sequence, assembly, 5-3 replacing an assembly, 13-3, 14-3 RF OUT power level, 10-26 RF output power correction constants adjustment, 3-11 RF power from source, 7-5 S sampler magnitude correction constants adjustment, 3-19 search for spurs with a filter, 3-27 without a filter, 3-28 selector switch, 5-7 self diagnose softkey, 10-7 self-test, 4-5 sequence fractional-N frequency range adjustment, 3-53 fractional-N spur avoidance and FM sideband adjustment, 3-54 high/low ba
Index peripheral equipment, 12-4 preregulator voltages, 12-7 probe power, 12-8 receiver block, 12-4 shutdown circuit, 12-8 shutdown indications, 12-7 signal separation, 12-26 source theory overview, 12-14 synthesized source, 12-3 test sets, 12-4 voltage indications, 12-7 tools and equipment, 1-2 trace noise test, 2-38 trace with sampler correction on and off, 8-12 tracking for source spur avoidance adjustment, 3-50 transmission tracking (ETF and ETR), 11-14 troubleshooting, 4-1 1st LO signal at sampler/mix
