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Performance

Tests

and

Adjustments

Manual

8568B

Spectrum

Analyzer

HEWLETT

PACKARD

HP Part No. 08568-90118

Printed in USA

September 1993

Summary of content (313 pages)

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Performance Tests and Adjustments Manual HP 8568B Spectrum Analyzer HEWLETT PACKARD HP Part No.
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Certification Warranty Hewlett-Packard Company certifies that this product met its published specifications at the time of shipment from the factory. Hewlett-Packard further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology, to the extent allowed by the Institute’s calibration facility, and to the calibration facilities of other International Standards Organization members.
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Assistance Product maintenance agreements and other customer assistance agreements are available for Hewlett-Rwkard products. Fbr any assistance, contact your nearest Hewlett-Packard Sales and Service OJke.
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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 The caution sign denotes a hazard. It calls attention to a procedure which, if not correctly performed or adhered to, could result in damage to or destruction of the instrument. Do not proceed beyond a caution sign until the indicated conditions are fully understood and met. Warning The warning sign denotes a hazard.
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HP 8568B Spectrum Analyzer Documentation Outline HP 8568B Installation and Verification Manual HP 8568B Operating and Programming Manual Included with the HP Model 8568B Spectrum Analyzer are three manuals: the Installation and Verification Manual, the Operating and Programming Manual, and the Performance Tests and Adjustments Manual. General information, installation, specifications, characteristics, and operation verification.
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Contents 1. General Information Introduction . . . . . . Instruments Covered by Operation Verification . Option 462 Instruments Option 857 Instruments . . this . . . . . . . . . . Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. Performance Tests Introduction . . . . . . . . . . . . . . . . . . . . . Verification of Specifications . . . . . . . . . . . . . Calibration Cycle . . . . . . . . . . . . . . . . . .
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Test Test Test Test Test Test Test Test Test Test Test 3. Contents-2 11. Log Scale Switching Uncertainty Test . . 12. Amplitude Fidelity Test . . . . . . . . . 13. Average Noise Level Test . . . . . . . . 14. Residual Responses Test . . . . . . . . . 15. Spurious Responses Test . . . . . . . . 16. Residual FM Test . . . . . . . . . . . . 17. Line-Related Sidebands Test . . . . . . . 18. Calibrator Amplitude Accuracy Test . . . 19. Fast Sweep Time Accuracy Test (~20 ms) 20. 1st LO Output Amplitude Test . .
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Crystal Filter Bypass Network Configuration . . . . . 3-151 4. Option 462 Introduction . . . . . . . . . . . . . . . . . . . . . 4. 6 dB Resolution Bandwidth Accuracy Test . . . . . 4. Impulse and Resolution Bandwidth Accuracy Test . 5. 6 dB Resolution Bandwidth Selectivity Test . . . . 5. Impulse and Resolution Bandwidth Selectivity Test . 6. Impulse and Resolution Bandwidth Switching Uncertainty Test . . . . . . . . . . . . . . . . Test 4.
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Figures l-l. Service Accessories, HP Part Number 08568-60001 . . 2-l. Center Frequency Accuracy Test Setup . . . . . . . . 2-2. Center Frequency Readout Error Measurement . . . . 2-3. Frequency Span Accuracy Test Setup . . . . . . . . 2-4. Sweep Time Accuracy Test Setup . . . . . . . . . . 2-5. Penlift Output Signal . . . . . . . . . . . . . . . . 2-6. Resolution Bandwidth Measurement . . . . . . . . . 2-7. 60 dB Bandwidth Measurement . . . . . . . . . . . 2-8. Bandwidth Switching Uncertainty Measurement .
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3-8. 3-9. 3-10. 3-11. 3-12. 3-13. 3-14. 3-15. 3-16. 3-17. 3-18. 3-19. 3-20. 3-21. 3-22. 3-23. 3-24. 3-25. 3-26. 3-27. 3-28. 3-29. 3-30. 3-31. 3-32. 3-33. 3-34. 3-35. 3-36. 3-37. 3-38. 3-39. 3-40. 3-41. 3-42. 3-43. 3-44. 3-45. 3-46. 3-47. 3-48. 3-49. 3-50. 3-51. 3-52. 3-53. 3-54. 3-55. Location of AlA Components . . . . . . . . . . . CRT Cut-Off Voltage Waveform at AlA3TP5’ : : : : : : : : : : : : : : : Discharging the CRT Post-Accelerator Cable . . . . . High Voltage Adjustment Setup . . . . . . . . . . .
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3-56. 3-57. 3-58. 3-59. 3-60. 3-61. 3-62. 3-63. 3-64. 3-65. 3-66. 3-67. 3-68. 3-69. 3-70. 3-71. 3-72. 3-73. 3-74. 3-75. 3-76. 3-77. 3-78. 3-79. 3-80. 3-81. 3-82. 3-83. 3-84. 3-85. 3-86. 3-87. 3-88. 3-89. 3-90. 3-91. 3-92. 3-93. 3-94. 4-l. 4-2. 4-3. 4-4. 4-5. 4-6. 4-7. 4-8. 5.1. 6-l. 6-2. 6-3. 6-4. 6-5. 6-6. Contents-6 20 MHz Reference Adjustments Setup . . . . . . . . Location of 20 MHz Reference Adjustments . . . . . Typical Signal at A16TP3 . . . . . . . . . . . . . .
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6-7. IF Section, Bottom View . . . . . . . . . . . . . .
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lhbles 2-l. 2-2. 2-3. 2-4. 2-5. 2-6. 2-7. Performance Test Cross-Reference . . . . . . . . . . Center Frequency Readout Error Test Record . . . . . Wide Span Error . . . . . . . . . . . . . . . . . . Span Error . . . . . . . . . . . . . . . . . . . . . Sweep Time Accuracy, Sweep Times 220 ms . . . . . Sweep Time Accuracy, Sweep Times ~20 s . . . . . . Sweep Time Accuracy, Sweep Times 220 ms (Alternate Procedure) . . . . . . . . . . . . . . . . . . . 2-8. Bandwidth Accuracy . . . . . . . . . . . . . . . .
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1 General Information Introduction This HP 8568B Tests and Adjustments Manual contains two sections: Performance Tests and Adjustments Procedures. The Performance Tests provided should be performed for the following reasons: w If the test equipment for the Operation Verification Program is not available. n If the instrument does not pass all of the Operation Verification tests. w For complete verification of specifications not covered by the Operation Verification program.
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Operation Verification A high confidence level in the instrument’s operation can be achieved by running only the Operation Verification Program, since it tests most of the instrument’s specifications. It is recommended that the Operation Verification Program be used for incoming inspection and after repairs, since it requires much less time and test equipment. A description of the program can be found in the Installation and Verification manual.
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‘Ihble l-l. Recommended Test Equipment (1 of 5) Instrument Critical Specifications for Equipment Substitution SIGNAL SOURCES Synthesized Frequency: 10 MHz to 1500 MHz Sweeper Output Power: + 10 dBm maximum (leveled) Aging Rate: ~1 x 10mg/day Spurious Signals: 135 dBc (~7 GHz) 125 dBc (<20 GHz) Amplitude Modulation: dc to 100 kHz Leveling: Internal, External Power Meter Zecommended Model HP 8340A Perf. 4dj.
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‘Ihble l-l. Recommended Test Equipment (2 of 5) Instrument ANALYZERS Spectrum Analyzer Critical Specifications for Equipment Substitution Recommended Perf. Adj. Model Test Frequency: 100 Hz to 2.5 GHz 2 to 22 GHz Preselected HP 8566A/B X Spectrum Analyzer RF Spectrum Analyzer Frequency: 9 kHz to 1.
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‘Ihble l-l. Recommended Test Equipment (4 of 5) Instrument Critical Specifications for Equipment Substitution Recommended Model Perf. Test 1dj. ATTENUATORS (Cont’d) 20 dB Attenuator ?requency: 200 Hz to 18 GHz rype N Connectors HP 8491B, Option 020 TERMINATIONS Termination Impedance: 500; BNC HP 11593A ?latness: ho.25 dB Cut-off Frequency:2400 MHz and ~500 MHz Xejection: >40 dB at 1750 MHz Telonic TLS450-7EE FIWERS Low-Pass Filter X Low-Pass Filter ht.
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‘Ihble l-l. Recommended Test Equipment (5 of 5) Instrument Critical Specifications for Equipment Substitution Recommended Perf. Adj a Model Test CABLES Cable Assembly Frequency Range: 200 Hz to 22 GHz HP 8120-4921 APC 3.5 Male Connectors Length: 91 cm (36 inches) SWR: cl.4 at 22 GHz Cable BNC, 122 cm (48 in.
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Description HP Part Number Extender Board: 20 contacts; 2 rows of 10 85680-60028 Cable: 4-foot long; BNC to SMB snap-on 85680-60093 PC Board: Display Adjustment Test 85662-60088 Extender Board: 30 contacts; 2 rows of 15 08505-60041 Extender Board: 12 contacts; 2 rows of 6 08505-60109 Extender Board: 50 contacts; 2 rows of 25 85680-60034 Extender Board: 36 contacts; 2 rows of 18 08505-60042 Figure l-l.
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2 Performance Tksts Introduction Verification of Specifications The procedures in this section test the instrument’s electrical performance using the Specifications in the Installation and Verification Manual as the performance standards. None of the tests require access to the interior of the instrument.
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Equipment Required Test Record Note Equipment required for the manual performance tests and adjustments is listed in ‘Ihble 2-1, Recommended Test Equipment, at the beginning of this manual. Any equipment that satisfies the critical specifications given in the list may be substituted for the recommended model. The Operation Verification Program provides a detailed test record when a printer is used with the controller.
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1. Center Frequency Readout Accuracy Test 1. Center Frequency Readout Accuracy ‘I&t Related Adjustments Frequency Control Adjustments Time Base Adjustment Step Gain and 18.4 MHz Local Oscillator Adjustments 50 MHz Voltage-Tuned Oscillator Adjustments Specification (uncorrected) f2% of frequency span + frequency reference error x tune frequency +30% of resolution bandwidth setting + 10 Hz) in AUTO resolution bandwidth after adjusting FREQ ZERO at stabilized temperature.
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1. Center Frequency Readout Accuracy Test Equipment Synthesized Sweeper . . . . . . . . . HP8340A Frequency Standard . 10 MHz standard, accy within + 1 part in lOlo, e.g. HP 5061A Adapter, Type N (m) to SMA (f) . . . HP1250-1250 61 cm (24 in.) Cable Assembly, SMA Male Connectors HP 5061-1086 Procedure 1. Connect CAL OUTPUT to SIGNAL INPUT 2. 2 . Press [INSTR PRESET), @ on the analyzer. 3 . Adjust FREQ ZERO for a maximum amplitude trace. 4 . Press (1tds-r~ PRESET). 5 .
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1. Center Frequency Readout Accuracy Test Note Spectrum analyzer center frequency readout can fall outside of specified limits if 10 MHz frequency reference has not been calibrated within the past year. To eliminate “frequency reference error x tune frequency” term, substitute spectrum analyzer 10 MHz FREQ REFERENCE rear panel output for frequency standard and repeat test. ‘Ihble 2-2.
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2. Frequency Span Accuracy lkst Related Adjustments Frequency Control Adjustments 50 MHz Voltage-Tuned Oscillator Adjustments Specification Uncertainty Span >l MHz f(2% of the actual frequency separation between two points +0.5% of span setting) 51 MHz 445% of the actual frequency separation between two points +0.5% of span setting) Description Frequency Span accuracy is determined by measuring a frequency at 5% of sweep and then at 95% of sweep.
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2. Frequency Span Accuracy Test Equipment Procedure Synthesized Sweeper ..................................................................... 83640A AdapterTypeN(m) to SMA(f).................................................1250-1250 Cable;SMAconnectors.....................................................................5061-5458 Cable; BNC122cm(48in)............................................................HP10503A 1. Connect equipment as shown in Figure 2-3. 2. Press 3.
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2. Frequency Span Accuracy Test r- Freq Span ‘Ihble 2-4. Span Error -I- 1 1 . 5 GHz Note SDan Error ADUT-ASyn from ‘Ihble 2-3 -I Spec. Min Max - 1 0 Hz 10 Hz -5000 Hz 5000 Hz -5,005 Hz 5,005 Hz -50,000 Hz 50,000 Hz -23,230 Hz 23,230 Hz -460,000 Hz 460,000 Hz -462,300 Hz 462,300 Hz -34,500.OOO Hz ] 34,500O.OOO Hz The specification in Table 2-4 was derived using the following formula: For spans > 1 MHz, the spec is: >*[(.02)(A synth freq) + (.005)(span)] For spans 2 1 MHz, the spec is: >&[(.
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3. Sweep Time Accuracy Test (220 ms) 3. Sweep Time Accuracy Test (220 ms) Related Adjustment Specification Description Frequency Control Adjustments *lo% for sweep times 5100 seconds &20% for sweep times >lOO seconds Preferred Procedure This test is for sweep times 220 ms. For faster sweep times, refer to Fast Sweep Time Accuracy Test (Test 19). A universal counter is connected to the PENLIFT RECORDER OUTPUT (on the rear panel) of the spectrum analyzer.
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3. Sweep Time Accuracy Test (220 ms) Equipment Universal Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 5316A Digital Voltmeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3456A Procedure Sweep Times 220 ms 1. Connect equipment as shown in Figure 2-4. 2. Press [INSTR PRESET ) on the spectrum analyzer. 3. Key in the following settings: (CENTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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3. Sweep Time Accuracy Test (220 ms) NOTE:PULSE WIDTH APPROXIMATE +15v t-SWEEP RETRACE -r-l ov- - - - JI r l t-ACTIVE SNEEP + START+TI”E INTERVAL MEASUREMENT 1 L --- STOPhE INTERVAL MEASUREMENT Figure 2-5. Penlift Output Signal 6. Note the measured sweep time on the universal counter and record this value in Table 2-5. The measured sweep time should be a value between the minimum and maximum values given in Table 2-5. 7. Repeat steps 5 and 6 for each sweep time setting in Table 2-5. ‘Ihble 2-5.
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3. Sweep Time Accuracy Test (220 ms) ‘Ihble 2-6. Sweep Time Accuracy, Sweep Times 220 s [SWEEP TIME) 20 s 200 s Sweep Times 220 ms (Alternate Procedure) 14. Sweep times 220 ms are tested without external test equipment by the following procedure. 15. Press Start-Up Time Measurement Marker A Time Min Measured Max 4.4 s 3.6 s 32 s 48 s ~NSTR PRESET). 16. Set @WEEP TIME] according to Table 2-7. Press MARKER (j-1. Rotate the DATA knob to place the marker on the left edge of the CRT display.
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4. Resolution Bandwidth Accuracy Test 4. Resolution Bandwidth Accuracy Test Related Adjustment Specification (For instruments with Option 462, refer to Chapter 4.) 3-dB Bandwidth Adjustments &20%, 3 MHz +lO%, 3 kHz to 1 MHz &20% 10 Hz to 1 kHz 30 kHz and 100 kHz bandwidth accuracy figures apply only with 190% Relative Humidity, < 40°C. Description Equipment Procedure The 3 dB bandwidth for each resolution bandwidth setting is measured with the MARKER function to determine bandwidth accuracy.
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4. Resolution Bandwidth Accuracy Test Figure 2-6. Resolution Bandwidth Measurement 8. Vary spectrum analyzer settings according to ‘fable the 3 dB bandwidth for each resolution bandwidth procedure of steps 6 and 7 and record the value in measured bandwidth should fall between the limits table. [REW) 3 MHz 1 MHz 300 kHz 100 kHz 30 kHz 10 kHz 3 kHz 1 kHz 300 Hz 100 Hz 30 Hz 10 Hz 2-14 Performance Tests T1 2-8. Measure setting by the ‘Ihble 2-8. The shown in the ‘Ihble 2-8.
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5. Resolution Bandwidth Selectivity Test 6. Read the 60 dB bandwidth for the 3 MHz resolution bandwidth setting from the MARKER A frequency readout (see Figure 2-7) and record the value in Table 2-9. 7. Vary spectrum analyzer settings according to Table 2-9. Measure the 60 dB bandwidth for each resolution bandwidth setting by the procedure of steps 4 through 6 and record the value in ‘fable 2-9. 8. Record the 3 dB bandwidths from Table 2-8 in Table 2-9. 9.
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5. Resolution Bandwidth Selectivity Test ‘lhble 2-9.
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6. Resolution Bandwidth Switching Uncertainty Test Related Adjustments (For instruments with Option 462, refer to Chapter 4.) 3 MHz Bandwidth Filter Adjustments 21.4 MHz Bandwidth Filter Adjustments Down/Up Converter Adjustments Specification (uncorrected; referenced to 1 MHz bandwidth; 20 - 30°C after 1 hour warm-up) k2.0 dB, 10 Hz bandwidth f0.8 dB, 30 Hz bandwidth *0.5 dB, 100 Hz to 1 MHz bandwidth fl.
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6. Resolution Bandwidth Switching Uncertainty Test Figure 2-8. Bandwidth Switching Uncertainty Measurement ‘Ihble 2-10. Bandwidth Switching Uncertainty Deviation (MKR A Readout, dB) 0 (ref) Allowable Deviation (dB) 0 (ref) 1 MHz 5 MHz 3 MHz 5 MHz IlIl.00 300 kHz 5 MHz Zto.50 100 kHz 500 kHz Ito. 30 kHz 500 kHz Ito. 10 kHz 50 kHz f0.50 3 kHz 50 kHz f0.50 1 kHz 10 kHz Ito. 300 Hz 1 kHz dZo.50 100 Hz 1 kHz Ito. 30 Hz 200 Hz f0.80 10 Hz 100 Hz f2.
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7. Input Attenuator Switching Uncertainty Test 6. Press MARKER CPEAK SEARCH),(KJ 7. Set [~~J’JREFERENCE LEVEL], and frequency synthesizer amplitude according to Table 2-l 1. At each setting, press MARKER ( PEAK SEARCH ) and record the deviation from the 10 dB setting from the MARKER A amplitude readout (see Figure 2-10). The deviation should not exceed *l.O dB at any setting. ~Sl”‘ir’ -40. CENTER i 28.
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8. Frequency Response Test Related Adjustment Specification Slope Compensation Adjustment SIGNAL INPUT 1 ~tl.5 dB, 100 Hz to 1.5 GHz *I dB, 100 Hz to 500 MHz SIGNAL INPUT 2 fl dB, 100 kHz to 1.5 GHz Description Frequency response at both analyzer inputs is tested by slowly sweeping a flat signal source over the frequency range and observing the peak-to-peak variation in trace amplitude. The test is divided into three parts. First, the response is tested from 20 MHz to 1.
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8. Frequency Response Test Note Equipment Equipment listed is for three test setups, Figure 2-11, Figure 2-13, and Figure 2-15. Synthesized Sweeper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8340A Power Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..HP436 A Power Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8482A Frequency Synthesizer . . . . . . . . . .
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8. Frequency Response Test 7. Adjust POWER LEVEL on synthesized sweeper (using data knob) to place peak of 20 MHz signal near reference level (top) graticule line. 8. Press [ENTER dB/mv], 1 dB on spectrum analyzer. Adjust POWER LEVEL on synthesized sweeper to position peak of signal 2 divisions below the reference level line. 9 . Key in the following spectrum analyzer settings: START FREQ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.MHz km) . . . . . . . .
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8. Frequency Response Test Option 001: Set [REFERENCE LEVEL] TO -6.0 dBm. 15. Repeat steps 6 through 11. Press DISPLAY LINE [ENTER) on the spectrum analyzer. Use the Display Line to measure the maximum and minimum points on the trace. Record measurements below. SIGNAL INPUT 1 (20 MHz to 1.5 GHz) Maximum dBm Minimum dBm 16. Press MARKER (-1 on spectrum analyzer. Set marker to 500 MHz. Press DISPLAY LINE (ENTER] on the spectrum analyzer.
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8. Frequency Response Test 25. After completion of sweep, press DISPLAY LINE (j?KiK] on the spectrum analyzer. Use the Display Line to measure the maximum and minimum points on the trace. Record the measurements below. SIGNAL INPUT 1 (100 kHz to 20 MHz) Maximum dBm Minimum dBm 26. Measure and record signal level at start of trace (100 kHz). SIGNAL INPUT 1 (100 kHz) dBm 27. Connect output of frequency synthesizer to SIGNAL INPUT 2. Activate this input with the pushbutton. Option 001.
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8. Frequency Response Test 100Hzto 100 kHz 32. Press (INSTR INPUT 1. PRESET) on the spectrum analyzer. Activate SIGNAL 33. Key in the following spectrum analyzer settings: 1 kHz 100 kHz START FREQ) . . . . .._.............................. ........... ;&TEq . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34. Connect equipment as shown in Figure 2-15 with function generator to SIGNAL INPUT 1. 35. Set the function generator controls as follows: LINE . .
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8. Frequency Response Test 42. Press DISPLAY LINE [ENTER] on the spectrum analyzer. Use the Display Line to measure the maximum and minimum points on the trace. (Disregard LO Feedthrough at 1 kHz.) Record the measurements below. SIGNAL INPUT 1 (1 kHz to 100 kHz) Maximum dBm Minimum dBm 43. Set Display Line to peak of trace at 1 kHz. 44. Key in the following spectrum analyzer settings: TRACE A ( CLEAR - WRITE ) . . . . . . . . . . . . . . . . . . . . .l kHz 1 kHz iO0 Hz 45.
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8. Frequency Response Test 49. For each input, subtract the lowest minimum level (greatest negative) from the highest maximum (least negative) measurement recorded in steps indicated. The result should not exceed 2 dB. SIGNAL INPUT 1 100 Hz to 500 MHz (from steps 16, 25, 42, or 48) Spec: ~2 dB Overall Maximum -Overall Minimum Overall Deviation dBm dBm dBm SIGNAL INPUT 2 100 kHz to 1.5 GHz (from steps 12 or 31) Spec: ~2 dB Overall Maximum -Overall Minimum Overall Deviation dBm dBm dBm 50.
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9. RF Gain Uncertainty Test h /I 1 I I\ -I Figure 2-16.
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10. IF Gain Uncertainty Test 10. IF Gain Uncertainty Test Related Adjustments Step Gain and 18.4 MHz Local Oscillator Adjustments 21.4 MHz Bandwidth Filter Adjustments Specification Assuming the internal calibration signal is used to calibrate the reference level at -10 dBm and the input attenuator is fixed at 10 dB, any changes in reference level from the -10 dB setting will contribute to IF gain uncertainty as shown: Uncertainty (uncorrected; 20 - 30°C) Range 0 dBm to -55.9 dBm Res BW 230 Hz, f0.
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10. IF Gain Uncertainty Test Equipment Frequency Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3335A Adapter, Type N (m) to BNC (f) . . . . . . . . . . . . . . . . . . . . . . . . HP 1250-0780 Procedure 1. Press ( INSTR pfwm-). 2. Connect CAL OUTPUT to SIGNAL INPUT. 3. Press Cm] 8. Adjust AMPTD CAL for a MARKER amplitude of -10.00 dBm 50.02 dB. 4. Press 10 dB Gain Steps (1~~733 PRESET ). 5. Set the frequency synthesizer for an output frequency of 20.
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10. IF Gain Uncertainty Test ‘Ihble 2-12. IF Gain Uncertainty, 10 dB Steps [REFERENCE LEVEL) Pm) Frequency Synthesizer Amplitude Pm) v 0 -2 100 -10 -12 100 -20 -22 100 -30 -32 100 -40 -42 100 -50 -52 100 -60 -62 10 -70 -72 10 -80 -32 100 -90 -42 100 -100 -52 10 -110 -62 10 -120 -72 10 Deviation (Marker A Amplitude WV 0 (ref.) Figure 2-18.
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10. IF Gain Uncertainty Test 2 dB Gain Steps 13. Press 14. Set QNSTR pREsETj,(jRECALL) [ REFERENCE LEVEL] 7. to -1.9 dBm. 15. Press MARKER (OFF). Set CVlDEo] to 100 Hz. 16. Set the frequency synthesizer for an output power level of -3.9 dBm. Set the amplitude increment for 2 dB steps. 17. Press MARKER [PEAK SEARCH),@ 18. Set the analyzer CREFERENCE LEVEL) and the frequency synthesizer amplitude according to ‘Iable 2-13. At each setting, note the MKR A amplitude and record it in the table.
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10. IF Gain Uncertainty Test 0.1 dB Gain Steps 19. Set [REFERENCE LEVEL) to 0 dB. 20. Set the frequency synthesizer for an output power level of -2.00 dBm. Set the amplitude increment for 0.1 dB steps. 21. Press MARKER [PEAK SEARCH),@. 22. Set the analyzer and the frequency synthesizer amplitude according to lkble 2-14. At each setting, note the MKR A amplitude and record it in the table. 23.
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10. IF Gain Uncertainty Test ‘Ihble 2-14. IF Gain Uncertainty, 0.1 dB Steps [REFERENCE LEVEL) Pm) Frequency Synthesizer Amplitude (am) 0.0 -2.00 -0.1 -2.10 -0.2 -2.20 -0.3 -2.30 -0.4 -2.40 -0.5 -2.50 -0.6 -2.60 -0.7 -2.70 -0.8 -2.80 -0.9 -2.90 -1.0 -3.00 -1.1 -3.10 -1.2 -3.20 -1.3 -3.30 -1.4 -3.40 -1.5 -3.50 -1.6 -3.60 -1.7 -3.70 -1.8 -3.80 -1.9 -3.90 Deviation (MKR A Amplitude PI 0 (ref) 25.
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11. Log Scale Switching Uncertainty Test REP b -9.8 dml ATTEN 10 HKA de dB 100.001 -a.a2 B MHZ *em 2 dB/ / CENTER 100.000 RES BW I MHZ 30 kHz kliz VBW 1 0 0 kHz \ SWP SPAN 100 kHZ 20.0 nl*ec Figure 2-20. Log Scale Switching Uncertainty Measurement able 2-15. Log Scale Switching Uncertainty SCALE (dB/DIV) 2-40 P e r f o r m a n c e T e s t s Allowable Deviation WV 1 0 (ref) 2 f0.5 5 f0.5 10 f0.
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12. Amplitude Fidelity Test 12. Amplitude Fidelity Test Related Adjustment Specification (For instruments with Option 857, refer to Chapter 5.) Log Amplifier Adjustments Log: Incremental ho.1 dB/dB over 0 to 80 dB display Cumulative 3 MHz to 30 Hz Resolution Bandwidth
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12. Amplitude Fidelity Test Equipment Procedure Frequency Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3335A Adapter, Type N (m) to BNC (f) . . . . . . . . . . . . . . . . . . . . . HP 1250-0780 Log Fidelity 1. Set the frequency synthesizer for an output frequency of 20.000 MHz and an output power level of + 10 dBm. Set the amplitude increment for 10 dB steps. 2. Connect equipment as shown in Figure 2-21. 3. Press ~NSTR PRESET) on the analyzer.
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12. Amplitude Fidelity Test 8. The fidelity error for amplitude steps from -10 dB to -80 dB should be <& 1.0 dB. 9. The fidelity error at the -90 dB setting should be s&l.5 dB. 4J REF 9.7 d&n YKR ATTEN 20 dB A 10 d0/ CENTER L 1 20.000 iB0 MHz RES BW I kHZ I I VBW 1 1 HT. I I I SWP I SPAN 0 300 n..c 1 nz Figure 2-22. Amplitude Fidelity Measurement Linear Fidelity 10. Key in analyzer settings as follows: (jEGi-- .................................................
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12. Amplitude Fidelity Test ‘Ihble 2-17. Linear Amplitude Fidelity 1 Frequency MARKER A Allowable Range Synthesizer Amplitude (f3 % of Reference Level) Amplitude (W (dB) MW I I I 2-44 Performance Tests 1 I I Min I Max I 0 -10.87 -9.21 -10 -23.10 -17.
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13. Average Noise Level Test 13. Average Noise Level Tkst Specification c-135 dBm for frequencies >I MHz, c-112 dBm for frequencies 500 Hz with 10 Hz resolution bandwidth, 0 dB input attenuation, 1 Hz video filter. Option 001: c-129 dBm for frequencies >l MHz, c-106 dBm for frequencies 51 MHz but >500 Hz with 10 Hz resolution bandwidth, 0 dB input attenuation, 1 Hz video filter (SIGNAL INPUT 1 only).
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13. Average Noise Level Test Figure 2-23. Average Noise Level Measurement 9. Read the average noise level from the DISPLAY LINE readout. The value should be c-112 dBm. dBm 10. Change [CENTER FREQUENCY) to 1.001 MHz. Follow the procedure to steps 7 through 9 to determine the average noise level. The value should be c-135 dBm. dBm 11. Change (-CENTER FREQUENCY) to 1501 Mhz. Follow the procedure of steps 7 through 9 to determine the average noise level. The value should be <- 135 dBm.
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14. Residual Responses Test 14. Residual Responses Test Specification c-105 dBm for frequencies >500 Hz with 0 dB input attenuation (no signal present at input) Option 100: c-99 dBm for frequencies >500 Hz with 0 dB input attenuation (SIGNAL INPUT 1 only). Option 400: c-95 dBm for frequencies >500 Hz with 0 dB input attenuation. c-105 dBm for frequencies >2.5 kHz with 0 dB input attenuation.
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14. Residual Responses Test Figure 2-24. Residual Responses Measurement 9. Press SWEEP [SINGLE_) and wait for completion of sweep. Look for any residual responses at or above the display line. If a residual is suspected, press SWEEP CRINGLE) again and see if the response persists. A residual will persist on repeated sweeps, but a noise peak will not. Any residual responses must be c-105 dBm. Option 400: Any residual 500 Hz to 2.5 kHz must be c-95 dBm; any residuals >2.5 kHz must be c-105 dBm 10.
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15. Spurious Responses Test 15. Spurious Responses Test Related Adjustment Specification Second Converter Adjustments For total signal power of c-40 dBm at the input mixer of the analyzer, all image and out-of-band mixing responses, harmonic and intermodulation distortion products are >75 dB below the total signal power for input signals 10 Mhz to 1500 MHz; >70 dB below the total signal power for input signals 100 Hz to 10 MHz.
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15. Spurious Responses Test SPECTRUM ANALYZER SYNTHESIZED SMEEPEA 10 DB ATTENUATOR 300 MHZ LPF J Figure 2-25. Harmonic Distortion Test Setup Note Equipment Procedure Equipment listed is for two test setups, Figure 2-25 and Figure 2-26. Synthesized Sweeper . . . . . . . . . . . . . . . . . . . . . . . . Frequency Synthesizer . . . . . . . . . . . . . . . . . . . . . . 10 dB Attenuator (2 required) .............. Lowpass Filter (300 MHz) . . . . . . . . . . . . . . . . . . .
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15. Spurious Responses Test signal for a marker indication of -20.00 dBm (-30.0 dBm at the input mixer with 10 dBm of input attenuation). 6 On the spectrum analyzer, key in MARKER @, CCENTER FREQUENCY) 560 MHz, MARKER CPEAK SEARCH) to position a second marker on the peak of the second harmonic distortion product of the 280 MHz input signal. The response should be below the display line (>70 dB below the input signal level). Second Harmonic dBm 7.
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15. Spurious Responses Test Intermodulation Distortion SPECTRUM ANALYZER ATTENUATOR ATTENUATOR DIRECTIONAL 50 MHz LON PASS FILTER Figure 2-26. Intermodulation Distortion Test Setup 11. Connect equipment as shown in Figure 2-26. 12. Set the controls of the spectrum analyzer as follows: CENTER FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.5 MHz FREQUENCY SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 MHz REFERENCE LEVEL . . . . . . . . . . . . . . . . . . .
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15. Spurious Responses Test Note If unable to locate intermodulation distortion products, temporarily increase output power level of frequency synthesizer and synthesized sweeper by + 10 dB. Return the output power level of both signal sources to the previous settings before making distortion measurements. 20. On the spectrum analyzer, key in MARKER [n), [ CENTER FREQUENCY ) 31 MHz, MARKER [ PEAK SEARCH ) to position a marker at the peak of the 31 MHz third-order intermodulation product.
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15. Spurious Responses Test 24. On the frequency synthesizer, readjust the signal amplitude as necessary to position the peak of the displayed 29.99 MHz signal at the top CRT graticule line. 25. On the spectrum analyzer, key in MARKER @, (CENTER FR EQUENCY ) 30.01 MHz, MARKER ( PEAK SEARCH ) to position a second marker at the peak of the 30.01 MHz third-order intermodulation product. The response should be below the display line (>70 dB below the input signals).
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15. Spurious Responses Test 35. On the spectrum analyzer, key in [CENTER FREQUENCY] 59 MHz, MARKER [PEAK SEARCH) to position a second marker at the peak of the 59 MHz second-order intermodulation distortion product. The response should be below the display line (>75 dB below the total input power).
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16. Residual FM Test Specification Description Equipment Procedure <3 Hz peak-to-peak in 110 s; frequency span ~100 kHz, resolution bandwidth 530 Hz, video bandwidth 530 Hz. The spectrum analyzer CAL OUTPUT is used to supply a stable 20 MHz signal to the analyzer. The analyzer is tuned in zero span to a point on the 30 Hz bandwidth response for which the slope of the response is known from direct measurement.
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16. Residual FM Test hr RF -I... L 1u Figure 2-28. Bandwidth Filter Slope Measurement 8. Compute the detection slope of the 30 Hz filter between the markers by dividing the MARKER A amplitude by the MARKER A frequency: filter slope = MARKER A amplitude/MARKER Afrequency = dB/Hz 9. Press SWEEP [CONT),(mj IOFF). 10. Change FREQUENCY SPAN] to 0 Hz. Readjust FREQ ZERO, if necessary, to position the trace at the center graticule line.
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16. Residual FM Test Figure 2-29. Slope Detected Residual FM 11. Press SWEEP CRINGLE) and wait for completion of the sweep. 12. Press MARKER [PEAK SEARCH_). Press DISPLAY LINE (m’ and position the display line at the lowest point on the trace. Figure 2-30.
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16. Residual FM Test 13. Press MARKER Ia] and position movable marker at the lowest point on the trace (see Figure 2-30). Read the MARKER A amplitude from the display and record its absolute value. MARKER A amplitude = p-p amplitude = dB 14. Divide the peak-to-peak amplitude by the slope computed in step 8 to obtain the residual FM: p-p amplitude/filter slope = residual FM dB/ dB/Hz = Hz = residual FM The residual FM should be less than 3 Hz. 15. Press ~NSTR PRESET]. 16.
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17. Line-Related Sidebands Tests Specification Description Equipment Procedure 95 dB below the peak of a CW signal. Option $00: >75 dB below the peak of a CW signal. The spectrally pure calibrator signal of the spectrum analyzer is applied to the analyzer input and the line related sidebands near the signal are measured. None required 1. Press ~NSTR PRESET) on the analyzer. Connect CAL OUTPUT to SIGNAL INPUT 2. 2. Press C-j 8 and adjust AMPTD CAL for a MARKER amplitude of -10.00 dBm f0.02 dB. 3.
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17. Line-Related Sidebands Tests Figure 2-31. Line Related Sidebands Measurement O p t i o n 4 0 0 1. Press ~NSTR PRESET]. Connect CAL OUTPUT to SIGNAL INPUT 2. 2. Press (ml 8 and adjust AMPTD CAL for a MARKER amplitude of -10. 00 dBm l tO.02 dB. 3. Press ONSTR PRESET). 4. Key in the following analyzer settings: [CENTER FREQUENCY] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PREFERENCE L E V E L ] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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18. Calibrator Amplitude Accuracy Test Related Adjustment Specification Description 20 MHz Reference Adjustments -10 dBm f0.3 dB The output level of the calibrator signal is measured with a power meter. SPECTRUW ANILYZER Figure 2-32. Calibrator Amplitude Accuracy Test Setup Equipment Procedure Power Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 436A Power Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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19. Fast Sweep Time Accuracy Test (~20 ms) 19. Fast Sweep Time Accuracy Test (430 ms) Related Adjustment Specification Description None &lo% for sweep times 5100 seconds The triangular wave output of a function generator is used to modulate a 500 MHz signal which is applied to the spectrum analyzer SIGNAL INPUT. The signal is demodulated in the zero span mode to display the triangular waveform.
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19. Fast Sweep Time Accuracy Test (~20 ms) 5. Press MARKER (PEAK SEARCHJ@~EFZF),~. 6. Set [FREQUENCY SPAN) to 0 Hz, (j-1 to 3 MHz, [VlDEoBW) to 3 MHz, and press TRIGGER Cm]. 7. Set synthesized sweeper for an amplitude-modulated output. 8. Set function generator controls as follows: FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . triangular wave . approximately 1 Vp-p AMPLITUDE . . . . . . . . . . . . . . . CAL position (in) OFFSET . . . . . . . . . CAL position (in) SYM . . . .
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19. Fast Sweep Time Accuracy Test (~20 ms) ‘able 2-18. Fast Sweep Time Accuracy (~20 ms) [SWEEP TIME] Function Generator Frequency Sweep Time Error (divisions) ww 5 ms 2.00 f0.02 2 ms 5.00 f0.05 1 ms 10.0 fO.1 200 ps 50.0 Iko.
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20. 1st LO Output Amplitude Test Specification Description >+4 dBm from 2.0 GHz to 3.7 GHz The power level at the 1ST LO OUTPUT connected is measured as the first L.O. is swept over its 2.0 GHz to 3.1 GHz range. SPECTRUM ANALYZER POWER METER Figure 2-35. 1st LO Output Amplitude Test Setup Equipment Procedure Power Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 436A Power Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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21. Frequency Reference Error Test 21. Frequency Reference Error Test Related Adjustment Specification Time Base Adjustment Aging Rate
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‘lhble 2-19. Performance Tkst Record Hewlett-Packard Company Tested by Model HP 8568B Report No. Serial No.
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Tkst 1. Center Frequency Readout Accuracy Test Step 8. Center Frequency Readout Error Test Record Spectrum Analyzer Comb Generator Comb Frequency WW 100 MC ww EXT TRIG (1, 2, 5, or 10 MHz) trigger signal 1 2-70 Performance Tests T Center Readout [FREQUENCY SPAN) [ C E N T E R FREQUENCY) 100 MHz 100 MHz 100 MHz 10 MHz 10 MHz 10 MHz 10 MHz 1 MHz 100 kHz 10 kHz 100 500 1000 100 500 1000 1500 1000 1000 1000 Min 98 498 998 99.8 499.8 999.8 1499.8 999.98 999.998 999.
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Test 2. Frequency Span Accuracy Test ‘I&t 2. Frequency Span Accuracy Test r Spectrumn,Analyzer Fkequency Span 200 Hz 100kHz 100.1 kHz IMHz 1.01 MHz 20 MHz 20.1 MHz 1.5 GHz Steps 7, 9, and 11. Wide Span Error Synthesized Sweeper Center Freq. A 1Frequency Cf-.45 span 100 100 100 100 100 100 100 900 MHz MHz MHz MHz MHz MHz MHz MHz 99.999 910 MHz 99.955 000 MHz 99.954955 MHz 99.550 OOOMHz 99.550 550 MHz 91.000000 MHz 90.955 000 MHz 225 MHz Freq. B cf + .45 span DUT Measured A Synth Freq. C Freq.
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Test 3. Sweep Time Accuracy Step 6. Sweep Time Accuracy, Sweep Times 220 ms [SWEEP TIME) 20 ms 50 ms 100 ms 500 ms 1s Min 18 ms 45 ms 90 ms 450 ms 900 ms Marker A Time Measured Max 22 ms 55 ms 110 ms 550 ms 1.10 s Step 12. Sweep Time Accuracy, Sweep Times 220 s 21 Step 19. Sweep Time Accuracy, Sweep Times 220 ms (Alternate Procedure) [SWEEP 20 ms 50 ms 100 ms 500 ms 1s 10 s 50 s 100 s 150 s 2-72 Performance Tests TIME) Sweet Gen Readout Min Measured 18.0 ms 45.0 ms 90.0 ms 450 ms 900 ms 9.
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Test 4. Resolution Bandwidth Accuracy ‘I&t 4. Resolution Bandwidth Accuracy Step 8. Bandwidth Accuracy [REW/ 3MHz 1MHz 300kHz 100kHz 30kHz 10kHz 3kHz 1kHz 300Hz 100Hz 30Hz 10Hz [FREQUENCY SPAN) 5MHz 2 MHz 500kHz 200kHz 50kHz 20kHz 5kHz 2 kHz 500 Hz 200Hz 100Hz 100Hz MARKER A Readout of 3 (d 3 Bandwidth Min Measured Max 2.400 MHz 3.600 MHz 1.100 MHz 900kHz 330.0 kHz 270.0 kHz 110.0 kHz 90.0 kHz 33.00 kHz 27.00 kHz 11.00 kHz 9.00 kHz 3.300 kHz 2.700 kHz 1.
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Test 5. Resolution Bandwidth Selectivity Steps 7, 8 and 9.
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Test 6. Resolution Bandwidth Switching Uncertainty Test lkst 6. Resolution Bandwidth Switching Uncertainty Test Step 6. Bandwidth Switching Uncertainty ‘FREQUENCY SPAN] Deviation (MKR A Readout, dB) Allowable Deviation PI 1 MHz 5 MHz 3 MHz 5 MHz AZ1.00 300 kHz 5 MHz Iko.50 100 kHz 500 kHz zto.50 30 kHz 500 kHz Ito. 10 kHz 50 kHz dzo.50 3 kHz 50 kHz kO.50 1 kHz 10 kHz f0.50 300 Hz 1 kHz f0.50 100 Hz 1 kHz f0.50 30 Hz 200 Hz 1tO.80 10 Hz 100 Hz f2.
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Test 7. Input Attenuator Switching Uncertainty Test Step 7.
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Test 8. Frequency Response Test Test 8. Frequency Respons g& Signal Input kep 12 SIGNAL INPUT 2 (20 MHz to 1.5 GHz) 15 SIGNAL INPUT 1 (20 MHz to 1.
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Test 9. RF Gain Uncertainty Test Step 6. 2nd LO Shift Min Measured Max -1.0 dB + 1.
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Test 10. IF Gain Uncertainty Test Test 10. IF Gain Uncertainty Test Step 12. Step IF Gain Uncertainty, 10 dB Steps [REFERENCELEVEL] Wm) Frequency Synthesizer Amplitude (dBm) Deviation (Marker A Amplitude W9 0 -2 100 -10 -12 100 -20 -22 100 -30 -32 100 -40 -42 100 -50 -52 100 -60 -62 10 -70 -72 10 -80 -32 100 -90 -42 100 -100 -52 10 -110 -62 10 -120 -72 10 0 (ref.) [SHIFT) [ENTER~B/DIVJJ Step 18.
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Test 10. IF Gain Uncertainty Test Step 22. IF Gain Uncertainty, 0.1 dB Steps [ R E F E R E N C E LEVELWm) 2-80 Performance Tests Frequency Synthesizer Amplitude VW 0.0 -2.00 -0.1 -2.10 -0.2 -2.20 -0.3 -2.30 -0.4 -2.40 -0.5 -2.50 -0.6 -2.60 -0.7 -2.70 -0.8 -2.80 -0.9 -2.90 -1.0 -3.00 -1.1 -3.10 -1.2 -3.20 -1.3 -3.30 -1.4 -3.40 -1.5 -3.50 -1.6 -3.60 -1.7 -3.70 -1.8 -3.80 -1.9 -3.
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Test 10. IF Gain Uncertainty Test Step 23. Recorded deviations from Step 12. A Reference Level Range: Step 24. B 0 to -70 dBm -80 to -120 dBm Largest Positive Deviation: dB dB Largest Negative Deviation: dB dB Recorded deviations from Steps 18 and 22. D Step 22 C Step 18 Largest Positive Deviation: dB dB Largest Negative Deviation: dB dB Steps 25 to 28. IF Gain Uncertainty Steu I 25. Sum 26. Sum 27. Sum 28. Sum 1 Min of of of of positive deviations of A, C, & D -0.
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YLkst 11. Log Scale Switching Uncertainty Tkst Step 6. Log Scale Switching Uncertainty SCALE MKR Amplitude (dB/DIV) PW 1 2-82 Performance Tests Deviation (W Allowable Deviation (W 0 (ref) 0 (ref) 2 xto.5 5 hO.5 10 f0.
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Test 12. Amplitude Fidelity Test Test 12. Amplitude Fidelity ‘I&t Step 6. Log Amplitude Fidelity Frequency 1 2 Fidelity Error W) W) 0 (ref) 0 (ref) ,Synthesizer Calibrated MARKER A Amplitude (Column 2 - Column 1: Amplitude Amplitude Step Wm) +lO 0 (ref) 0 -10 -10 -20 -20 -30 -30 -40 -40 -50 -50 -60 -60 -70 -70 -80 -80 -90 Step 14.
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Test 13.
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Test 14. Residual Responses Test Test 14. Residual Responses Test Step 11. Maximum Residual Response Frequency Range 500 Hz to 1500 MHz Option 400: 500 Hz to 2.5 kHz 2.
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Tkst 15.
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Test 16. Residual FM Test Test 16. Residual FM Test Step 14.
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Tkst 17. Line-Related Sidebands Test Min 1 M e a s u r e d Step 7 7.
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Test 18. Calibrator Amplitude Accuracy Test Test 18. Calibrator Amplitude Accuracy ‘I&t Step 2. CAL OUTPUT Amplitude Min Measured Max -10.3 dBm -9.70 dBm Performance Tests 2.
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Test 19. Fast Sweep Time Accuracy Test (~20 ms) Step 11. F&t Sweep Time Accuracy (~20 ms) [ SWEEP TIME) 2.90 Performance Tests Function Generator Frequency (kW 5 ms 2.00 kO.02 2 ms 5.00 Iko.05 1 ms 10.0 fO.1 200 ps 50.0 f0.
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Test 20. 1st LO Output Amplitude Test Test 20. 1st LO Output Amplitude Test Step 4.
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Test 21. Frequency Reference Error Test ISteD 4. 5. 6. 2-92 Performance Tests 1 Min 1 Measured 1 Max 1 DescriDtion Frequency (initial) 10. MHz Frequency (after 24 hours) 10. MHz Difference between 4 and 5 Hz 0.
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3 Adjustments Introduction Warning The procedures in this section are for the adjustment of the instrument’s electrical performance characteristics. The procedures require access to the interior of the instrument and therefore should only be performed by qualified service personnel. Refer to Safety Considerations in this introduction. 1. Low Voltage Power Supply Adjustments . . . . . . . . . . . . . . . . . . . . . .3-10 2. High Voltage Adjustment (SN 3001A and Below) . . . . . . . . . . . . . 3-10 2.
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Safety Considerations Warning Although this instrument has been designed in accordance with international safety standards, this manual contains information, cautions, and warnings which must be followed to ensure safe operations and to retain the instrument in safe condition. Service and adjustments should be performed only by qualified service personnel. Adjustments in this section are performed with power supplied to the instrument while protective covers are removed.
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‘able 3-l. Adjustment Cross Reference Function Adjusted Low Voltage High Voltage CRT Display (Standard) Adjustment Procedure 1. Low Voltage Power Supply Adjustments 2. High Voltage Adjustment 3. Preliminary Display Adjustment 4. Final Display Adjustments CRT Display (Digital Storage) 25. Digital Storage Display Adjustments IF Gains 5. Log Amplifier Adjustments 10. Step Gain and 18.4 MHz Local Oscillator Adjustments Log Scales 6. Video Processor Adjustments Bandwidth Amplitudes 7.
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Related Adjustments Any adjustments which interact with, or are related to, other adjustments are indicated in the adjustments procedures. It is important that adjustments so noted are performed in the order indicated to ensure that the instrument meets specifications.
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‘Ihble 3-2. Adjustable Components Adjustment Function Adjustment Number 3 Adjusts rise and fall times of Z axis amplifier pulse. Adjusts rise and fall times of Z axis amplifier pulse. 3 Sets adjustment range of front-panel INTENSITY 3 control. Corrects focus for beam intensity. 3 Magnitude of top/bottom focus correction. Centering of top/bottom focus correction. Magnitude of right/left focus correction. Centering of right/left focus correction. Sets orthogonality of CRT. 3 Adjusts spot size.
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‘Ihble 3-2. Adjustable Components (continued) Adjustment Function Adjustment Adjustment Reference Name Number Designator SWEEP OFFSET Adjusts digital sweep to begin at left edge of 25 A3AlR34 graticule. LL THRESH Adjusts point at which graticule lines switch from A3A2R12 25 short to long lines. Adjusts horizontal sample and hold pulse. XS&H A3A2R50 25 Adjusts vertical sample and hold pulse.
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‘able 3-2. Adjustable Components (continued) Reference Designator A4A4C9 Adjustment Name SYM Adjustment Adjustment Function Number 8 Centers A4A4 bandwidth filter crystal pole symmetry. 8 Centers A4A4 bandwidth filter LC pole #l. 8 Centers A4A4 bandwidth filter crystal pole 8 Adjusts A4A4 bandwidth filter crystal pole symmetry. Dips A4A4 bandwidth filter LC pole #l. 8 8 Dips A4A4 bandwidth filter LC pole #2. Adjusts A4A4 bandwidth filter crystal pole 8 symmetry. Centers A4A4 bandwidth filter LC pole #2.
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Table 3-2. Adjustable Components (continued) Reference Designator A4A7C42 A4A7R30 Adjustment Name CTR 10 Hz AMPTD A4A7R4 1 10 Hz AMPTD A4A8C13 SYM A4A8C29 A4A8C32 A4A8C42 CTR LC CTR SYM A4A8C44 A4A8C46 A4A8C66 A4A8C67 A4A8R6 CTR LC CTR LC DIP LC DIP A20 dB A4A8R7 A10 dB A4A8R35 A4A8R40 LC XTAL A4A9R60 A4A9R6 1 A4A9R62 A4A9R65 A4A9R66 A4A9R73 3 MHz 1 MHz 300 kHz 10 kHz 3 kHz 1 kHz 9 9 9 9 9 9 Adjusts Adjusts Adjusts Adjusts Adjusts Adjusts 3 MHz bandwidth. 1 MHz bandwidth.
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‘Ih.ble 3-2.
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‘Ihble 3-2. Adjustable Components (continued) Adjustment Name E D C B ZERO -9v Adjustment Number 21 21 21 21 21 21 A7A2C 1 A7A2C2 A7A2C3 A7A2C4 400 MHz OUT 400 MHz OUT 400 MHz OUT 100 MHz 14 14 14 14 Peaks 400 MHz output signal. Peaks 400 MHz output signal. Peaks 400 MHz output signal. Adjusts VCXO frequency. A7A4AlAlCl A7A4AlAlC5 FREQ ADJUST PWR ADJUST 15 15 Adjusts VCO frequency. Adjusts VCO output level. A8R2 + 22V ADJUST 1 Sets +22 V de supply voltage.
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‘lhble 3-2. Adjustable Components (continued) Al lA5Rl Adjustment Name IMPEDANCE MATCH IMPEDANCE MATCH IF GAIN A16R62 A16R67 A16R68 A16R71 A16R72 OFFSET SWEEPTIME AUX GAIN 2 GAIN 1 13 13 13 13 13 Adjusts Adjusts Adjusts Adjusts Adjusts A17R50 +2OV ADJ 1 Adjusts +20 V de supply voltage. A19R9 -12.6 VR 13 A19R19 A19R32 A19R41 OFFSET 2.5 GHz SPAN 25 GHz SPAN OFFSET 25 GHz SPAN +lOVR 13 13 13 Adjusts -12.6 V reference for YTO dAC high end (6.2 GHz). Adjusts summing amplifier offset. Adjusts 5.
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‘Ihble 3-2. Adjustable Components (continued) Reference Designator AlA2R31 AlA2R32 Adjustment Name ORTHO PATTERN Adjustment Adjustment Function Number Sets orthogonality of CRT. 3 Adjusts for optimum rectangular shape of CRT 3 display. Sets adjustment range of front-panel INTENSITY 3 control. AlA2R35 INTENSITY AlA2R36 A lA2R30 LIMIT ASTIG FOCUS GAIN 3 4 Adjusts astigmatism of CRT. Adjusts for optimum focus of CRT display. AlA3R14 FOCUS LIMIT 3 Coarse adjusts CRT focus.
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‘Ihble 3-3. Factory-Selected Components Reference Adjustment Range of Values Designator Procedure (0 or PF) AlA2R9 2.87 K to 6.19 K 19.6 K to 42.2 K A3AlR72 121 K to 162 K A3A2R17 10.0 K to 26.1 K A3A2R2 1 Open or 1.0-10.0 A3A3C27 Function of Component A3A3C32 1.0 to 10.0 A3A3R47 A3A3R48 5.0 K to 12.5 K 5.0 K to 12.5 K Sets intensity level. Sets intensity level. Sets intensity level. Sets intensity level. Compensates for feedthrough of INTG signal to Ul.
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l’hble 3-3. Factory-Selected Components (continued) Reference Designator A4A3R74 A4A3R79 A4A3R80 A4A3R8 1 A4A4ClO A4A4C17 A4A4C38 A4A4C66 A4A4C70 A4A4C92 A4A4C97 A4A4C99 A4A4ClOO A4A4ClOl A4A4R3 A4A4R16 A4A4R20 A4A4R35 A4A4R40 A4A4R42 A4A4R44 A4A4R45 A4A4R60 A4A4R64 A4A4R65 A4A4R94 A4A5C9 A4A5RlO A4A5R62 A4A5R70 A4A5R86 Adjustmenl Procedure 10 11 10 10 10 3-14 Adjustments O-16 1.62 K to 2.61 K 1.33 K to 3.48 K 472 to 1.62 K 215 to OPEN 42.2 to 75.
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‘Ihble 3-3. Factory-Selected Components (continued) Reference Adjustment Designator Procedure A4A7R13 A4A7R23 A4A7R24 A4A7R34 A4A7R35 A4A7R45 A4A7R46 A4A7R56 A4A7R57 A4A7R60 10 A4A7R66 A4A7R68 A4A7R70 A4A7R72 A4A7R74 A4A7R76 A4A7R78 A4A7R80 A4A7R82 A4A7R84 A4A7R86 A4A7R88 A4A7R90 A4A7R92 A4A7R94 A4A7R96 A4A7R98 A4A7RlOO A4A7R102 A4A7R104 Range of Values (0 or PF) 10.0 K to 17.8 K 10.0 K to 17.8 K 10.0 K to 17.8 K 10.0 K to 17.8 K 10.0 K to 17.8 K 10.0 K to 17.8 K 10.0 K to 17.8 K 7.50 K to 13.3 K 7.
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Ifable 3-3. Fhctory-Selected Components (continued) Reference Adjustment Designator Procedure A4A8R19 A4A8R24 A4A8R26 A4A8R29 A4A8R30 A4A8R34 A4A8R36 A4A8R36 A4A8R52 A4A8R55 Range of Values (0 or PF) 100 Kl to 1M 0 to 100 3.83 K to 9.09 K 909 to 2.37 K 3.16 K to 8.25 K 100 K to OPEN 100 K to OPEN 10 K to OPEN 3.83 K to 9.09 K 3.16 K to 8.25 K A4A9R3 A4A9R6 A4A9R7 A4A9RlO A4A9R 11 A4A9R46 A4A9R48 A4A9R50 A4A9R52 A4A9R55 A4A9R57 A4A9R59 A4A9R70 A4A9R72 A4A9R74 A4A9R83 A4A9R84 A4A9R85 A4A9R86 A4A9R87 6.
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‘Ihble 3-3. Factory-Selected Components (continued) Reference Designator A6A9AlR5 AGASAlRlC Adjustment Procedure 18 19 Range of Values (0 or PF) 23.7 to 180 909 to 1.21 K A6A9AlR27 18 56.2 K A6AlOR86 A6AlOR87 A6AlOR88 A6AlOR89 A6AlOR90 A6AlOR91 21 21 21 21 21 21 10 to 40 K 10 to 40 K 10 to 40 K 10 to 40 K 10 to 40 K 10 to 40 K A6Al lR2 21 100 K to 196 K Adjusts band A breakpoint for best flatness. ABAlBCl A6A12C2 A6A12C3 A6A12Cll A6A 12C23 A6A12R64 21 21 21 21 21 0.1 to 0.68 fiF 0.1 to 0.
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‘able 3-3. Factory-Selected Components (continued) Function of Component Reference Adjustment Range of Values Designator Procedure (0 or PF) Al lA4R24 348 to 562 Sets YTO loop gain crossover to 20 &2 kHz. Al lA5C22 AllA5LlO Al lA5R22 Sets YTO loop response ~20 MHz. Sets YTO loop response. response Sets YTO loop 20 to 30 MHz. 16 16 16 130 to 220 pF 2.2 to 3.3 ,uF 15 to 51.1 n A13C22 620 to 1300 A15ClO 62 to 91 Sets oscillator frequency to 10 MHz *0.75 MHz. 73.874 K/74.
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‘able 3-3. Factory-Selected Components (continued) Reference Adjustment Range of Values Designator Procedure (0 or PF) Function of Component Option 462 A4A7R12 A4A7R13 A4A7R23 A4A7R24 A4A7R34 A4A7R35 A4A7R45 A4A7R46 A4A7R56 A4A7R57 A4A7R68 A4A7R70 A4A7R76 A4A7R84 A4A7R86 A4A7R92 A4A7R94 A4A7RlOO A4A7R102 A4A8R30 A4A8R55 A4A8C43 A4A9R3 A4A9R6 A4A9R7 A4A9RlO A4A9Rll A4A9R83 A4A9R85 A4A9R86 A4A9R87 5.62 K to 7.5 K 5.62 K to 7.5 K 5.62 K to 7.5 K 5.62 K to 7.5 K 5.62 K to 7.5 K 5.62 K to 7.5 K 5.11 K to 6.
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‘lkble 3-4. Standard Value Replacement Capacitors r apa Type: Tubular Range: 1 to 24 pF filerance: 1 to 9.1 pF = f0.25 pF Value (pF) 1BP Fart Number CD 1.0 1.2 1.5 1.8 2.0 2.2 2.4 2.7 3.0 3.3 3.6 3.9 4.3 4.7 5.1 5.6 6.2 6.8 7.5 8.2 9.1 10.0 11.0 12.0 13.0 15.0 16.0 18.0 20.0 22.0 24.
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‘lhble 3-5. Standard Value Replacement 0.125 Resistors Resistors Type: Fixed-Film Range: 10 to 46413 Ohms Wattage: 0.125 at 125’C Tolerance: fl.O% Value (n) EP Fart Number Value (fl) EP Fart Number 10.0 0757-0346 422 0698-3447 0757-0378 11.0 0 0698-0082 464 1 12.1 0757-0379 0757-0416 511 0757-0417 0698-3427 13.3 0 562 0698-3428 1 0757-0418 619 14.7 0757-0382 0757-0419 16.2 6 681 0757-0294 9 0757-0420 17.8 750 2 0757-0421 19.6 0698-3429 825 21.5 0698-3430 5 0757-0422 909 0698-3431 6 0757-0280 23.7 l.
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‘Ihble 3-5. Standard Value Replacement 0.125 Resistors (continued) 1 Resistors Type: Fixed-Film Range: 10 to 464K Ohms Wattage: 0.125 at 125°C fl.O% To1 e ‘an Value (!I) ElP Fart Number Value (0) BP Part Number co 17.8K 19.6K 21.5K 23.7K 26.1K 28.7K 31.6K 34.8K 38.3K 42.2K 46.4K 51.1K 56.2K 61.9K 68.1K 75.OK 82.5K 90.
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Table 3-6. Standard Value Replacement 0.5 Resistors Resistors Type: Fixed-Film Range: 10 to 1.47M Ohms Wattage: 0.5 at 125’C To1 ‘ant 31.0% 56 Value (fl) BP Part Number - Value (0) EIP Fart Number 10.0 11.0 12.1 13.3 14.7 16.2 17.8 19.6 21.5 23.7 26.1 28.7 31.6 34.8 38.3 42.2 46.4 51.1 56.2 61.9 68.1 75.0 82.5 90.
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Ihble 3-6. Standard Value Replacement 0.5 Resistors (continued) 1 Resistors Type: Fixed-Film Range: 10 to 1.47M Ohms Wattage: 0.5 at 125°C To1 e *an fl.O% Value (0) EIP Fart Number CD Value (a) EIP Fart Number 16.2K 17.8K 19.6K 21.5K 23.7K 26.lK 28.7K 31.6K 34.8K 38.313 42.2K 46.413 51.1K 56.2K 61.9K 68.1K 75.OK 82.5K 90.
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1. Low-Voltage Power Supply Adjustments 1. Low-Voltage Power Supply Adjustments Reference IF-Display Section: AlA f15 V Regulator AlA + 120 V, +5.2 V Regulator (Serial Number Prefix 3004A and above) AlA + 100 V, +5.2 V Regulator (Serial Number Prefix 3001A and below) RF Section: A24 Voltage Regulator Description The + 15 V supply is adjusted for the IF-display Section, and the +20 V supply is adjusted for the RF Section.
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1. Low-Voltage Power Supply Adjustments 4. Connect the DVM to AlA6TP3 on the IF-Display Section. DVM indication should be + 15.000 fO.O1O V dc. If the voltage is out of tolerance, adjust AlA6R9 + 15 V ADJ for the specified voltage. , AlA71P2 AlA6DS2 AlA6TP4 5 Figure 3-2. IF-Display Section Low-Voltage Adjustments (SN 3001A and Below) A l A7DS2 A lA6DS2 AlA7TP3 AiA6TP4 t Figure 3-3. IF-Display Section Low-Voltage Adjustments (SN 3004A and Above) 5.
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1. Low-Voltage Power Supply Adjustments 7. Verify that the + 120 V indicator AlA7DS2 (yellow LED) is lit. Note On IF-Display Sections serial prefixed 3001A and below, indicator AlA7DS2 is a + 100 V indicator. 8. Connect the DVM to AlA7TP3. DVM indication should be + 120.0 ~k3.0 V dc. The + 120 V supply is referenced to the + 15 V supply; therefore, if the + 120 V supply is out of tolerance, a circuit malfunction is indicated.
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1. Low-Voltage Power Supply Adjustments supply, therefore, if the +5V supply is out of tolerance, a circuit malfunction is indicated. 17. The -5V indicator A24DS6 (yellow LED) should be lit. 18. Connect the DVM to A24TP7. The DVM indication should be -5.200 ho.050 V de. The -5V supply is referenced to the +2OV supply, therefore, if the -5V supply is out of tolerance, a circuit malfunction is indicated. 19. The -15V indicator A24DS3 (yellow LED) should be lit. 20. Connect the DVM to A24TP4.
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2. High-Voltage Adjustment (SN 3001A and Below) 2. High-Voltage Adjustment (SN 3001A and Below) Note This procedure is for IF-Display Sections with serial number prefixes 3001A and below. The procedure for serial prefixes 3004A and above is located immediately after this procedure. Note This procedure should be performed whenever the AlAll High Voltage Multiplier, AlVl CRT, or AlA High Voltage Regulator Assembly is repaired or replaced.
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2. High-Voltage Adjustment (SN 3001A and Below) DIGITIZING OSCILLOSCOPE HI-VOLTAGE SIGNAL ANALYZER Figure 3-5. High Voltage Adjustment Setup Equipment Digital Voltmeter (DVM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .HP 3456A DC High-Voltage Probe (1000: 1 divider) . . . . . . . . . . . . . . . . . . HP 34111A Display Adjustment PC Board (service accessory) . . . . . . .85662-60088 Digitizing Oscilloscope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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2. High-Voltage Adjustment (SN 3001A and Below) Note The accuracy of the high-voltage probe is specified for a probe connected to a dc voltmeter with 10 M62 input resistance. HP 3456A and HP 3455A digital voltmeters have a 10 MQ input resistance on the 100 V and 1000 V ranges. All measurements in this procedure should be performed with the DVM manually set to the 100 V range (fOO.OOO on the HP 3456A display). , AlA8DSl r, P AlA H I G H VOLTAGE REGULATOR - AlA7TP3 I . AlA6R32 Figure 3-6.
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2. High-Voltage Adjustment (SN 3001A and Below) Warning With the protective cover removed in the following step, do not place hands near the AlA High-Voltage assembly. High voltage (approximately -4000 V dc) can be present even when the ac line cord is disconnected. 10. Wait at least one minute for capacitors to discharge to a safe level. 11. Remove the protective cover from the AlA High-Voltage Regulator. A label should be visible on the AlAST High-Voltage Transformer.
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2. High-Voltage Adjustment (SN 3001A and Below) If the calibration factor calculated in step 8 is 0.00099, and AlA3Tl is labeled for -3875 V, then adjust AlA6R32 HV ADJ for a DVM indication of: 0.00099 x (-3875 V) = -3.836 V dc 16. With the front-panel INTENSITY control fully counterclockwise, wait approximately 30 minutes to allow the high-voltage supply to stabilize and the CRT to normalize. This sofl turn-on will extend CRT life expectancy, particularly if a new CRT has just been installed. 17.
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2. High-Voltage Adjustment (SN 3001A and Below) 27. On the oscilloscope press [SHOW]. 28. Connect the oscilloscope channel 1 probe to AlA3TP5 using a long probe extension. See Figure 3-7 for the location of AlA3TP5. 29. Reconnect the ac line cords to each instrument section. Adjust the front-panel INTENSITY control fully counter-clockwise, and then set the LINE switch to ON (the INSTR CHECK I LED will light.) 30. Wait approximately 30 seconds for the dc regulator circuits to stabilize again. 31.
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2. High-Voltage Adjustment (SN 3001A and Below) 34. On the oscilloscope, adjust the channel 1 offset voltage as necessary to measure the peak-to-peak CRT cut-off voltage, V,,, at AlA3TP5. See Figure 3-9. This peak-to-peak voltage should be between 45-75 V,.,. Note this voltage for use in step 39. 1 0 . 0 V/div 1 offset: 6 0 . 0 0 v 10.00 : 1 dc -250.000 us 0 . 0 0 0 0 0 s 5 0 . 0 us/dlv 2 5 0 . 0 0 0 us 1 f 75.00 v Figure 3-9. CRT Cut-Off Voltage 35.
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2. High-Voltage Adjustment (SN 3001A and Below) 39. Slowly adjust the front-panel INTENSITY control through its entire range while monitoring the peak-to-peak voltage at AlA3TP5. As the INTENSITY control is turned clockwise, the peak-to-peak voltage at AlA3TP5 will drop. To prevent long-term CRT damage, this voltage should not drop below (V,, - 5O)V,., or 12 VP-,,, whichever is greater. See Figure 3-10. (The value of V,, was recorded in step 34.
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2. High-Voltage Adjustment (SN 3001A and Below) AlA4, and AlA assemblies function properly and do not require compensation, proceed directly to adjustment procedure 4, “Final Display Adjustments (SN 3001A and Below)“. Discharge Procedure for High Voltage and CRT The adjustment procedures in this manual do not require the removal or discharge of the AlA High-Voltage Regulator or CRT assemblies.
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2. High-Voltage Adjustment (SN 3001A and Below) 5. While holding the insulated handle of the screwdriver, touch the grounded blade to the following connections: a. Both brown wires going to the rear of the CRT from AlA via cable harness W21. b. The yellow, blue, and orange wires in the same cable as “a. ” above. c. The top lead of each of the 11 large vertical capacitors on the AlA High-Voltage Regulator Assembly. 6.
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2. High-Voltage Adjustment (SN 3004A and Above) 2. High-Voltage Adjustment (SN 3004A and Above) Note This procedure is for IF-Display Sections with serial number prefixes 3004A and above. The procedure for serial prefixes 3001A and below is located immediately before this procedure. Note This procedure should be performed whenever the AlVl CRT or AlA High Voltage Regulator Assembly is repaired or replaced.
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2. High-Voltage Adjustment (SN 3004A and Above) Equipment Digital Voltmeter (DVM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .HP 3456A DC High-Voltage Probe (1000: 1 divider) . . . . . . . . . . . . . . . . . . HP 34lllA High-Voltage Adjustment Procedure Warning In the following procedure, it is necessary to probe voltages which, if contacted, could cause serious personal injury. Use a nonmetallic alignment tool when making adjustments. Be extremely careful.
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2. High-Voltage Adjustment (SN 3004A and Above) / AlABOSl - AlA7TP3 AlA H I G H VOLTAGE / REGULATOR - AlA6R103 Figure 3-13. Location of High Voltage Adjustments 4. Set the LINE switch to ON. Set the front-panel INTENSITY control fully counterclockwise (CRT beam at cut-off) to prevent possible damage to the CRT. 5. Note the DVM indication at AlA7TP3. DVM Indication: 6. Connect the high-voltage probe to the DVM, and connect the probe to AlA7TP3. 7. Note the DVM indication. DVM Indication: 8.
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2. High-Voltage Adjustment (SN 3004A and Above) 11. Remove the protective cover from the AlA High-Voltage Regulator Assembly. A label should be visible on the AlA3Al High Voltage Assembly. (AlASAl is mounted on the non-component side of the High-Voltage Regulator Assembly as shown in Figure 3-14.) Record the voltage listed on the label for use in step 15. In cases where more than one voltage is listed on this label, record the value which is closest to -2400 Vdc.
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2. High-Voltage Adjustment (SN 3004A and Above) 16. With the front-panel INTENSITY control fully counter clockwise, wait approximately 10 minutes to allow the high-voltage supply to stabilize and the CRT to normalize. This sofl turn-on will extend CRT life expectancy, particularly if a new CRT has just been installed. 17. Readjust AlA6R103 HV ADJ for a DVM indication equal to the voltage determined in step 15. 18. If a new CRT has just been installed do the following: a.
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2. High-Voltage Adjustment (SN 3004A and Above) 3. Connect one end of a jumper wire (made of insulated wire and two alligator clips) to the blade of the screwdriver. Connect the other end of the jumper wire to the metal chassis of the IF Display Section. This grounds the screwdriver. 4. Slide the screwdriver’s blade between the CRT and the sheet metal as shown in Figure 3-15. Gently work the tip of the screwdriver under the post-accelerator cable’s rubber shroud.
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3. Preliminary Display Adjustments (SN 3001A and Below) 3. Preliminary Display Adjustments (SN 3001A and Below) Reference AlAl Keyboard AlA Z-Axis Amplifier A1 A4 X-Deflection Amplifier AlA Y-Deflection Amplifier Note Adjustment 2, “High-Voltage Adjustment,” should be performed before performing the following adjustment procedure. Note Perform this adjustment only if components have been replaced on the AlA Z-Axis Amplifier, AlA X-Deflection Amplifier, or AlA Y Deflection Amplifier Assemblies.
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3. Preliminary Display Adjustments (SN 3001A and Below) Procedure X and Y Deflection Amplifier Pulse Response Adjustments 1. Connect a 10:1 (10 MQ) divider probe to the oscilloscope’s channel 1 input and a 10: 1 divider probe to the channel 4 input. 2. On the oscilloscope, press CRECALL) [ml to perform a soft reset. 3. On the oscilloscope, press [CHAN] more preset probe , select channel 1, and use the front-panel knob to select a 1O:l probe. 4.
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3. Preliminary Display Adjustments (SN 3001A and Below) A1A5, AlA4- AlA2’ - A3A2 Figure 3-17. Location of AlA2, AlA4, AlA5, and A3A2 HF R22 G(lN f f$ “1: Ry GA I id R28 H F ,G A I N ~000uu000000u00ur AlA AlA4/AlA5 Figure 3-18. AlA2, AlA4, and AlA Adjustment Locations 10. Set the Pulse/Function Generator controls as follows: MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . NORM Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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3. Preliminary Display Adjustments (SN 3001A and Below) 16. Three waveforms should be displayed on the oscilloscope, as shown in Figure 3-20. The lower composite waveform represents the combined X deflection voltage applied to the CRT. Use the oscilloscope’s front-panel knob to adjust waveform fl sensitivity for approximately 8 vertical divisions. DISPLAY hp s t o p p e d remote listen : -125.000 “s 1 2 5 . 0 0 0 ns 5 0 . 0 ns/div 3 7 5 . 0 0 0 “S’ Figure 3-20. Composite X Deflection Waveform 17.
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3. Preliminary Display Adjustments (SN 3001A and Below) 19. Connect the oscilloscope’s channel 1 probe to AlA5El and the channel 4 probe to AlA5E2. See Figure 3-18 for the location of the test points. Connect the output of the pulse/function generator to 52 (Y input) on the Display Adjustment PC board in the A3A2 slot. 20. The Y Deflection Amplifier is identical to the X Deflection Amplifier. Repeat steps 12 through 18 for the Y Deflection Amplifier using R7, R27, R28, ClO, and Cl1 respectively.
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3. Preliminary Display Adjustments (SN 3001A and Below) 28. Set the oscilloscope controls as follows: Press @iK]: Channel 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . on amplitude scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6.25 V/div Press @iZZQ. 29. Adjust AlA4R7 X POS and AlA5R7 Y POS to either extreme to position the CRT beam off-screen (to prevent possible damage to the CRT phosphor).
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3. Preliminary Display Adjustments (SN 3004A and Above) Reference AlAl Keyboard Al A2 X, Y, Z Axis Amplifier Note Adjustment Procedure 2, “High-Voltage Adjustment,” should be performed before performing the following adjustment procedure. Note Perform this adjustment only if components have been replaced on the AlA X, Y, Z Axis Amplifier Assembly. Components R117, R217, R308, C104, C109, C204, C209, and C307 are factory adjusted and normally do not require readjustment.
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3. Preliminary Display Adjustments (SN 3004A and Above) Procedure X and Y Deflection Amplifier Pulse Response Adjustments 1. Connect a 1O:l (10 MQ) divider probe to the oscilloscope’s channel 1 input and a 1O:l divider probe to the channel 4 input. 2. On the oscilloscope, press (RECALL) (CLEARI) to perform a soft reset. 3. On the oscilloscope, press (CHAN) more preset probe , select channel 1, and use the front-panel knob to select a 10: 1 probe. 4.
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3. Preliminary Display Adjustments (SN 3004A and Above) AlA A3A2 A3Al Figure 3-24. Location of AlA and A3A2 R127 P120 Cl09 TP105 R227 c204 R220 R217 J5 TP5Ol GEID c307 Figure 3-25. AlA Adjustment Locations 10. Set the Pulse/Function Generator controls as follows: MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NORM Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..pulse Frequency (FRQ) . . . .
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3. Preliminary Display Adjustments (SN 3004A and Above) 12. Set the oscilloscope controls as follows: Press [CHAN]: Channel 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . on amplitude scale ...................................... 10.0 V/div offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..25.000 0 V Channel 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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3. Preliminary Display Adjustments (SN 3004A and Above) the combined X deflection voltage applied to the CRT. Use the oscilloscope’s front-panel knob to adjust waveform fl sensitivity for approximately 8 vertical divisions. hp r u n n i n g : .I 2 0 . 0 V/div 1 offset: 25.00 V ..:.. :::. .:. ::.:::::.::.:::.. ~:~. ~~~..~I;::r~i~~~-:1. - 1 2 5 . 0 0 0 ns .: 1 2 5 . 0 0 0 ns 5 0 . 0 ns/dlv 3 7 5 . 0 0 0 ns 1 f 25.00 V Figure 3-27. Composite X Deflection Waveform 17.
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3. Preliminary Display Adjustments (SN 3004A and Above) 19. Connect the oscilloscope’s channel 1 probe to AlA2TP104 and the channel 4 probe to AlA2TP105. See Figure 3-25 for the location of the test points. Connect the output of the pulse/function generator to 52 (Y input) on the Display Adjustment PC board in the A3A2 slot. 20. The Y Deflection Amplifier is identical to the X Deflection Amplifier.
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3. Preliminary Display Adjustments (SN 3004A and Above) 29. Set the oscilloscope controls as follows: Press (CHAN]: Channel 1 . amplitude scale Press @KiX-]. . . . . . . . . . . . . . . . . .8.00 on V/div 30. Adjust the spectrum analyzer’s front-panel INTENSITY control for 50V peak-to-peak (8 divisions) as indicated on the oscilloscope. See Figure 3-29. hf r u n n i n g 1. - 1 2 5 . 0 0 0 ns 1 2 5 . 0 0 0 ns 5 0 . 0 ns/div 375.000~"s 1 f 50.00 v Figure 3-29. 5OV,., Signal 31.
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4. Final Display Adjustments (SN 3001A and Below) 4. Final Display Adjustments (SN 3001A and Below) Reference Description Note Procedure Note AlAl AlA AlA AlA Keyboard Z Axis Amplifier X Deflection Amplifier Y Deflection Amplifier This procedure is used to optimize the appearance of the CRT display during routine maintenance or after CRT replacement or minor repairs.
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4. Final Display Adjustments (SN 3001A and Below) 5. For best overall focusing of the display, adjust the following potentiometers in the sequence listed below: a. AlA3R14 FOCUS LIMIT for best focus of graticule lines (long vectors) b. AlA2R36 ASTIG c. AlA2R30 FOCUS GAIN for best focus of annotation (short vectors) 6. Adjust AlA2R31 ORTHO, the front-panel ALIGN control, and AlA2R32 PATT to optimize the orientation and appearance of the rectangular graticule pattern on the CRT display. 7.
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4. Final Display Adjustments (SN 3004A and Above) 4. Final Display Adjustments (SN 3004A and Above) Reference AlAl Keyboard AlA X, Y, Z Axis Amplifiers Description This procedure is used to optimize the appearance of the CRT display during routine maintenance or after CRT replacement or minor repairs. First, the display is adjusted for best focus over the full CRT, then the graticule pattern is adjusted for optimum rectangular display. Equipment Digital Photometer . . . . . . . . . . . . . . . . . . .
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4. Final Display Adjustments (SN 3004A and Above) RI20 R220 R512 R513 R319 R426 R437 Figure 3-32. Location of Final Display Adjustments on AlA ‘Ihble 3-6.
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4. Final Display Adjustments (SN 3004A and Above) 8. For an initial coarse focus, adjust the following potentiometers in the sequence listed: AlA3R14 FOCUS LIMIT AlA2R517 ASTIG AlA2R513 3D AlA2R409 FOCUS COMP 9. Press QNSTR PRESET), then adjust the reference level to bring the displayed noise to the top division of the graticule. Press CENTER dB/DIvj and key in 1 dB/DIV. The noise should now completely fill the CRT graticule pattern, illuminating a large rectangular area.
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4. Final Display Adjustments (SN 3004A and Above) 17. Adjust AlA2R512 ORTHO and the front-panel ALIGN control to optimize the orientation and appearance of the rectangular graticule pattern on the CRT display. 18. Repeat steps 13 through 17 as needed to optimize overall display focus and appearance.
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5. Log Amplifier Adjustments 5. Log Amplifier Adjustments Reference Related Performance Tests Note Description IF-Display Section A4A3 Log Amplifier-Filter A4A2 Log Amplifier-Detector Scale Fidelity Test The A4A3 Log Amplifier-Filter and A4A2 Log Amplifier Detector are temperature compensated as a matched set at the factory. In the event of a circuit failure, a new matched set must be ordered. Contact your nearest HP Service Center.
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5. Log Amplifier Adjustments 4. Connect DVM to A4AlTPl and DVM ground to the IF casting. Connect the frequency synthesizer to the RF INPUT. Key in CFREQUENCY) 80 MHz and [ AMPLITUDE ) -86.98 dBm. The frequency synthesizer will now provide a 5OfI load. Offset Adjustment Check 5. Adjust A4A2R79 ZERO for 0.0000 f0.0005 V dc. See Figure 3-34 for location of adjustment.
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5. Log Amplifier Adjustments Bandpass Filter Amplitude Adjustment 9. Connect one end of a jumper wire to A4A3TP8. Connect the other end of the jumper to A4A3TP7 (+ 15V). Connecting the jumper to A4A3TP8 first reduces the chance of shorting the + 15V to ground. Note DVM indication. V dc 10. Remove the short from between A4A3TP7 and A4A3TP8. 11. Adjust A4A3R67 AMPTD for DVM indication the same as that noted in step 9 f0.0005 V dc. See Figure 3-34 for location of adjustment.
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5. Log Amplifier Adjustments 23. Decrease the frequency synthesizer’s output level 10 dB. Press CREFERENCE LEVEL) 0 dBm, and adjust the frequency synthesizer’s output level for a DVM indication of + 1.00 k.001 Vdc. 24. Verify that attenuator is set at 10 dB. Decrease the frequency synthesizer output level by 10 dB. Press [REFERENCE LEVEL] -60 dB. 25. Adjust A4A3R83 LGlO for DVM indication of + 1.000 kO.010 V dc. See Figure 3-34 location of adjustment.
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6. Video Processor Adjustments 6. Video Processor Adjustments Reference Related Performance Test Description IF-Display Section A4A 1 Video Processor Log Scale Switching Uncertainty Test The CAL OUTPUT signal is connected to the RF INPUT through a step attenuator. The instrument is placed in zero frequency span to produce a dc level output from the log amplifier. The A4A2 ZERO adjustment, which sets the dc offset of the output buffer amplifier of the log board, is checked and adjusted if necessary.
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6. Video Processor Adjustments 6. Set step attenuator to 120 dB. DVM indication should be 0.000 *0.0005 V dc. (If DVM indication is out of tolerance, adjust A4A2R79 ZERO on the log amplifier-detector board..) 7. Set step attenuator to 0 dB. 8. Key in [Reference LWI) and adjust DATA knob for DVM indication as close to + 1.000 fO.OO1 V dc as possible. (It may be necessary to slightly adjust the front panel AMPTD CAL control to achieve required tolerance.) 9. Connect DVM to A4AlTP2. 10.
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6. Video Processor Adjustments 22. Decrease reference level to -70 dBm using the step key. 23. DVM indication should be +0.200 l 0.002 V dc greater than the indication recorded in step 19. If not, readjust A4AlR2 LG OS. 24. Decrease reference level to -90 dBm using the step key. 25. DVM indication should be +0.400 f0.004 V dc greater than the indication recorded in step 19. If not, readjust A4AlR2 LG OS. 26. Repeat steps 17 through 25 until the specifications are met.
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7. 3 MHz Bandwidth Filter Adjustments Reference Related Performance Test Description IF-Display Section A4A7 3 MHz Bandwidth Filter Resolution Bandwidth Switching Uncertainty Test Resolution Bandwidth Selectivity Test With the CAL OUTPUT signal connected to the RF INPUT, the 18.4 MHz oscillator can be adjusted with the FREQ ZERO control (on the front panel) to peak the IF signal for maximum amplitude for the center of the 3 MHz bandpass.
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7. 3 MHz Bandwidth Filter Adjustments Procedure 1. Position instrument upright as shown in Figure 3-37 and remove top cover. 2. Set LINE switch to ON and press ~NSTR PRESET). Frequency Zero Check 3. Connect CAL OUTPUT signal to RF INPUT 4. Key in IRECALL) @. 5. Adjust front panel FREQ ZERO control for maximum signal amplitude on the CRT display. Filter Center and Symmetry Adjustments 6. Key in ~CENTER FREQUENCY) 20 MHz, CFREQUENCY SPAN) 10 kHz, [REsBWI) 1 kHz, and press LIN pushbutton.
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7. 3 MHz Bandwidth Filter Adjustments 10. Adjust A4A7C15 CTR for minimum amplitude of signal peak. Adjust A4A7C14 SYM for best symmetry. Repeat adjustments to ensure that the signal is nulled and adjusted for best symmetry. See Figure 3-38 for location of adjustments. 11. Remove crystal filter bypass network near C23 SYM. 12. Adjust A4A7C24 CTR for minimum amplitude of signal peak. Adjust A4A7C23 SYM for best symmetry of signal.
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7. 3 MHz Bandwidth Filter Adjustments 25. Adjust A4A7C13 PK for maximum peak-to-peak signal on Channel 2 display. See Figure 3-39 for location of adjustment. If unable to achieve a “peak” in signal amplitude, increase or decrease value of A4A7C12. Refer to Table 3-3 for range of values. A4A7 3 MHz Bandwidth Filter Figure 3-39. Location of 3 MHz Peak Adjustments 26. Move Channel 2 probe to A4A7TP3 (left side of C32 SYM). 27. Adjust frequency synthesizer output frequency to peak Channel 1 display. 28.
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7. 3 MHz Bandwidth Filter Adjustments 10 Hz Amplitude Adjustments 37. Connect CAL OUTPUT to RF INPUT. Key in [mj 9, (jEEki-- 10 Hz. [INSTR PRESET), 38. Adjust the instrument front panel FREQ ZERO control for maximum signal amplitude on the CRT display. U s1 kHz and i DISPLAY n LINE g [ENTER). t h 39. Key in CREs] DATA knob, place the display line at the signal trace. e 40. Key in [REs] 10 Hz. 41. Adjust the instrument front panel FREQ ZERO control for maximum signal amplitude on the CRT display. 42.
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8. 21.4 MHz Bandwidth Filter Adjustments 8. 21.4 MHz Bandwidth Filter Adjustments Reference Related Performance Tests Description IF-Display Section A4A4 Bandwidth Filter A4A8 Attenuator-Bandwidth Filter IF Gain Uncertainty Test Resolution Bandwidth Switching Uncertainty test Resolution Bandwidth Selectivity Test First the LC Filters (100 kHz to 3 MHz bandwidths) on the A4A4 Bandwidth Filter are adjusted.
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8. 21.4 MHz Bandwidth Filter Adjustments Equipment Digital Voltmeter (DVM) . . . . . . . . . . . . . . . . . . . . . . . .HP 3456A 10 dB Step Attenuator . . . . . . . . . . . . . . HP 355D, Option H89 1 dB Step Attenuator . . . . . . . . . . . . . . . HP 355C, Option H25 Crystal Filter Bypass Network (2 required) . . . . Refer to Figure 3-91 Procedure 1. Position instrument upright as shown in Figure 3-40 and remove top cover. 2. Set LINE switch to ON and press QNSTR PRESET].
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8. 21.4 MHz Bandwidth Filter Adjustments 10. Key in CRESBW_) 1 MHz, and ISPAN) 1 MHz. 11. Press MARKER CPEAK SEARCH], MARKER a. 12. Key in CREsBW) 100 kHz, [-SPAN) 200 kHz, and MARKER [ PEAK SEARCH). 13. Adjust A4A4R43 LC to align markers on display. MARKER A level should indicate 1.00 X. See Figure 3-41 for location of adjustment. 14. Repeat steps 10 through 13 until no further adjustment is necessary. A4A4 XTAL Adjustments 15. Press MARKER loFF). Key in CREsJ 30 kHz and [ FREQUENCY SPAN] 100 kHz. 16.
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8. 21.4 MHz Bandwidth Filter Adjustments 22. Adjust A4A4C73 CTR to center signal on center graticule line. Adjust A4A4C65 SYM for best symmetry of signal. See Figure 3-42 for location of adjustments. If unable to adjust A4A4C65 SYM for satisfactory signal symmetry, increase or decrease value of A4A4C66. Refer to Table 3-3 for range of values. 23. All crystal filter bypass networks are removed. Signal should be centered and symmetrical. If not, go back to step 16 and repeat adjustments. 24. Press MARKER 25.
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8. 21.4 MHz Bandwidth Filter Adjustments 33. Key in t-1 100 kHz, C-1 200 kHz, and MARKER [ PEAK SEARCH]. 34. Adjust A4A8R35 LC to align makers on display. MARKER A level should indicate 1.00 X. See Figure 3-43 for location of adjustment. 35. Repeat steps 31 through 34 until no further adjustment is necessary. A4A8 XTAL Adjustments 36. Key in @TFTiTj 30 kHz, MARKER IOFF). [ FREQUENCY SPAN ] 100 kHz. Press 37. Connect crystal filter bypass network between A4A8TPl and A4A8TP2. 38.
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8. 21.4 MHz Bandwidth Filter Adjustments 45. Adjust A4ABR40 XTAL to align markers on display. MARKER A level should indicate 1.00 X. See Figure 3-44 for location of adjustment. LC Dip Adjustments 46. Refer to the Resolution Bandwidth Switching Uncertainty Performance Test, and check all bandwidth amplitudes. If amplitude of 300 kHz bandwidth is low but amplitude of 100 kHz and 1 MHz bandwidths are within tolerance, LC DIP adjustments must be performed.
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8. 21.4 MHz Bandwidth Filter Adjustments approximately -17 kHz (to the left). If unable to achieve a “dip” in signal amplitude, increase or decrease value of A4ABR30. Refer to ‘&ble 3-3 for range of values. 62. Remove short from A4ABTP6 and short A4ABTP3 to ground. 63. Adjust A4ABC67 LC DIP for minimum amplitude of signal peak. See Figure 3-43 for location of adjustment. Key in [PEAK SEARCH) MARKER [nl, and adjust LC DIP again to offset the signal peak approximately -17 kHz (to the left).
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9. 3 dB Bandwidth Adjustments Reference Related Performance Test IF-Display Section A4A9 IF Control Resolution Bandwidth Accuracy Test Description The CAL OUTPUT signal is connected to the RF INPUT. Each of the adjustable resolution bandwidths is selected and adjusted for the proper bandwidth at the 3 dB point. Note Do not perform this adjustment on Option 462 instruments. Option 462 instruments require a different procedure.
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9. 3 dB Bandwidth Adjustments A4A9 IF CONTROL \ A4A3 Figure 3-45. Location of 3 dB Bandwidth Adjustments 9. Press MARKER a. Adjust marker to 3 dB point on opposite side of signal (CRT MKR A annotation indicates 1.00 X). There are now two markers; one on each side of the signal at the 3 dB points. 10. CRT MKR A annotation now indicates the 3 dB bandwidth of the 3 MHz bandwidth. 3 dB bandwidth should be 3.00 &to.60 MHz. 11. Key in @YWBW) 1 MHz and [FREQUENCY SPAN] 2 MHz.
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9. 3 dB Bandwidth Adjustments 22. CRT MKR A annotation now indicates the 3 dB bandwidth of the 300 kHz bandwidth. 3 dB bandwidth should be 300.0 f30.0 kHz. 23. Key in @GZVBW) 10 kHz and [FREQUENCY SPAN) 20 kHz. If necessary, readjust PREFERENCE LEVEL] and [ CENTER FREQUENCY ), using DATA knob to place signal peak near top of graticule and centered on center graticule line. 24. Press MARKER IOFF], then MARKER [ ]. 25.
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10. Step Gain and 18.4 MHz Local Oscillator Adjustments 10. Step Gain and 18.4 MHz Local Oscillator Adjustments Reference Related Performance Tests Description IF-Display Section A4A7 3 MHz Bandwidth Filter A4A5 Step Gain Resolution Bandwidth Selectivity Test IF Gain Uncertainty Test Center Frequency Readout Accuracy Test First, the IF signal from the RF Section is measured with a power meter and adjusted for proper level.
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10. Step Gain and 18.4 MHz Local Oscillator Adjustments Equipment Procedure Digital Voltmeter (DVM) . . . . . . . . . . . . . . . . . . . . . . . . HP 3456A Power Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..HP436 A Power Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8481A 10 dB Step Attenuator . . . . . . . . . . . . . . HP 355D, Option H89 1 dB Step Attenuator . . . . . . . . . . . . . . . HP 355C, Option H25 1.
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10. Step Gain and 18.4 MHz Local Oscillator Adjustments 10. If A4A5R33 CAL adjustment does not have sufficient range to adjust trace to the top CRT graticule line, increase or decrease the value of A4A7R60 as necessary to achieve the proper adjustment range of A4A5 CAL adjustment. See Figure 3-39 for the location of A4A7R60. Refer to Table 3-3 for range of values for A4A7R60. 10 dB Gain Step Adjustment 11. Connect CAL OUTPUT to RF INPUT through 10 dB step attenuator and 1 dB step attenuator. 12.
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10. Step Gain and 18.4 MHz Local Oscillator Adjustments 1 dB Gain Step Checks 22. Key in [REFERENCE LEVEL) -19.9 dBm. Set step attenuators to 15 dB. Press MARKER @ twice to establish a new reference. 23. Key in dB. ( REFERENCE LEVEL ) -17.9 dBm. Set step attenuators to 13 24. MKR A level, as indicated by CRT annotation, should be .OO f0.5 dB. If not, increase or decrease the value of A4A5R86. Refer to ‘Ihble 3-3 for range of values. 25. Key in dB. ( REFERENCE LEVEL ) -15.9 dBm.
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10. Step Gain and 18.4 MHz Local Oscillator Adjustments A4A5 S T E P G A I N R2 +lOV A D J RlO Cl0 F R E O Z E R O C O A R S E C9 R51 “R A4A5 Figure 3-49. Location of .l dB Gain Step, 18.4 MHz LO, and + 1OV Adjustments 36. Key in [FREQUENCY SPAN] 1kHz, [REs] 100 Hz, and [ PEAK SEARCH] a]. 37. Adjust front-panel FREQ ZERO control fully clockwise. Press CPEAK SEARCH]. Signal should move at least 60 Hz away from center CRT graticule line. 38.
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11. Down/Up Converter Adjustments Reference IF-Display Section A4A6 Down/Up Converter Related Performance Test Description Resolution Bandwidth Switching Uncertainty Test The CAL OUTPUT signal is connected to the RF INPUT connector of the instrument and controls are set to display the signal in a narrow bandwidth. A marker is placed at the peak of the signal to measure the peak amplitude.
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11. Down/Up Converter Adjustments 6. Adjust A4A6AlR29 WIDE GAIN to align markers on CRT display. MKR A level should indicate 1.00 X. See Figure 3-51 for location of adjustment. 7. Disconnect CAL OUTPUT from RF INPUT. Optional Note Perform the following procedure if the A4A6Al assembly is replaced or the A4A6Al 21.4 MHz Bandpass Amplifier Filter is worked on. 1. Disconnect CAL OUTPUT from RF INPUT. 2. Key in IOFF). [REFERENCE LEVEL) -70 dBm, [REs] 1 kHz, and MARKER 3.
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11. Down/Up Converter Adjustments Down Converter Gain Adjustment Note If a gain problem is suspected in the 10 Hz to 1 kHz resolution bandwidths, perform the following procedure to test and adjust the gain through A4A6A2. 1. Place A4A6 on extender boards. 2. On the spectrum analyzer being tested, press QNST the spectrum analyzer to the following settings: PRESET], and set CENTER FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . 20 MHz RESOLUTION BANDWIDTH . . . . . . . . . . . . . . . . . . . .
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12. Time Base Adjustment (SN 2840A and Below, also 3217A05568 and Above) 12. Time Base Adjustment (SN 2840A and Below, also 3217AO5568 and Above) Reference Related Performance Test Description RF Section: A27Al 10 MHz Quartz Crystal Oscillator Center Frequency Readout Accuracy Test The frequency of the internal 10 MHz Frequency Standard is compared to a known frequency standard and adjusted for minimum frequency error.
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12. Time Base Adjustment (SN 2840A and Below, also 3217A05568 and Above) Procedure Note The spectrum analyzer must be ON continuously (not in STANDBY) for at least 72 hours immediately prior to oscillator adjustment to allow both the temperature and frequency of the 10 MHz Quartz Crystal Oscillator to stabilize. Adjustment should not be attempted before the oscillator is allowed to reach its specified aging rate. Failure to allow sufficient stabilization time could result in oscillator misadjustment.
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12. Time Base Adjustment (SN 2840A and Below, also 3217A05568 and Above) 6. Set the Frequency Counter controls as follows: INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A ATTENUATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .x10 DC Coupled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF 1 Mdl input impedance . . . . . . . . . . . . . . . . . . . . . . . . . . OFF AUTOTRIG . . . . . . . . . . . . . . . . . . .
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12. Time Base Adjustment (SN 2840A and Below, also 3217A05568 and Above) Reading 11: mHz 14. Subtract the shifted frequency reading in step 11 from the last recorded frequency in step 10. This gives the frequency correction factor needed to adjust the A27 10 MHz Frequency Standard. Frequency Correction Factor: mHz 15. On the Frequency Counter, select a 1 second gate time bv pressing, ~~~ 1 @kiK]. The Frequency Counter should now display the difference between the frequency of the INPUT A signaland 10.
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12. Time Base Adjustment (SN 2848A to 3217A05567) 12. Time Base Adjustment (SN 2848A to 3217A05567) Reference Related Performance Test Description RF Section: A27Al Frequency Standard Regulator A27A2 10 MHz Quartz Crystal Oscillator Center Frequency Readout Accuracy Test The frequency of the internal 10 MHz Frequency Standard is compared to a known frequency standard and adjusted for minimum frequency error.
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12. Time Base Adjustment (SN 2848A to 3217A05567) The A27A2 10 MHz Quartz Crystal Oscillator (HP P/N 1081 l-601 11) typically reaches its specified aging rate again within 72 hours after being switched off for a period of up to 30 days, and within 24 hours after being switched off for a period less than 24 hours. If extreme environmental conditions were encountered during storage or shipment (i.e.
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12. Time Base Adjustment (SN 2848A to 3217A05567) INT/EXT switch (rear panel) . . . . . . . . . . . . . . . . . . . . . EXT 7. On the Frequency Counter, select a 10 second gate time by pressing, (GATETIME_) 10 (GATE]. 8. Offset the displayed frequency by -10.0 MHz by pressing, MATH (SELECT/ENTER] Cm) 10 I-1 6 [SELECT/E~&ER] ( SELECT/ENTER). The Frequency Counter should now display the difference between the frequency of the INPUT A signal (A27 10 MHz Frequency Standard) and 10.
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12. Time Base Adjustment (SN 2848A to 3217A05567) 15. On the Frequency Counter, select a 1 second gate time by pressing, t-1 1 @Y%YiK]. The Frequency Counter should now display the difference between the frequency of the INPUT A signal and 10.0 MHz with a resolution of 0.01 Hz (10 mHz). Note Do not use a metal adjustment tool to tune an oven-controlled crystal oscillator (OCXO). The metal will conduct heat away from the oscillator circuit, shifting the operating conditions. 16.
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13. 20 MHz Reference Adjustments 13. 20 MHz Reference Adjustments Reference Related Performance Test Description RF Section: Al6 20 MHz Reference Calibrator Amplitude Accuracy Test The 20 MHz output is peaked and amplitude checked for proper level. The INTERNAL REFERENCE output level is then checked for proper output level as compared to input from A27 Time Base. Finally, the COMB DRIVE and CAL OUTPUT are adjusted for proper power levels.
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13. 20 MHz Reference Adjustments Procedure 1. Position instrument on right side as shown in Figure 3-56 and remove bottom cover. Remove Al6 20 MHz Reference and install on extenders. See Figure 3-57 for the location of Al6 components. 2. Set LINE switch to ON and press (INSTR PRESET). 3. Set rear-panel FREQ REFERENCE INT/EXT switch to INT. Disconnect cable 2 (red) from A16Jl. Connect power meter to output of Time Base (A27Jl) using cable 2 (red). Note power meter indication for reference later. dBm 4.
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13. 20 MHz Reference Adjustments 8566AB Spectrum Analyzer SCALE to 10 dB/division. (CENTER FREQUENCY_) to 20.34 MHz and 10. Adjust Al6 20.34 MHz NULL A16C12 for minimum 20.34 MHz signal at A16J3 as indicated by HP 8566A/B Spectrum Analyzer display. With signal nulled, the plates of the NULL adjustment capacitor should be meshed approximately halfway. If fully meshed or fully unmeshed, a circuit malfunction is indicated. 11.
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13. 20 MHz Reference Adjustments Press &K?@ Press CnTavj: AVmarkers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..on Vmarker 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 800mv Vmarker2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..2.7V start marker . . . . . . . . . . . . . . . . . place at 2.7V crossing stop marker . . . . . . . . . . . . . place at next 2.7V crossing 2 1.
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14. 249 MHz Phase Lock Oscillator Adjustments 14. 249 MHz Phase Lock Oscillator Adjustments Reference Description RF Section: A7 249 MHz Phase Lock Oscillator Two center frequencies are chosen: one which will tune the 249 MHz Oscillator to its low-end frequency and one which will tune the 249 MHz Oscillator to the high-end frequency.
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14. 249 MHz Phase Lock Oscillator Adjustments Procedure 1. Place instrument on right side with IF-Display Section facing right as shown in Figure 3-59. 2. Set LINE switch to ON and press QNSTR PRESET]. 3. Connect DVM to A7TPl and ground to A22TP12. 4. Key in [CENTER on HP 8568B. FREQUENCY ) 17.6 MHz and [ FREQUENCY SPAN ) 0 Hz 5. Adjust A7 PLO A7C3 for DVM indication between +5.2 V dc and +6.0 V dc. See Figure 3-60 for location of adjustment. A7 2 4 9 M H z PHASE LOCK OSCILLATOR Figure 3-60.
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14. 249 MHz Phase Lock Oscillator Adjustments 15. Set LINE switch to STANDBY. Adjust A7L2 one-half turn counterclockwise before placing A7 249 MHz PLO in HP 8568B Spectrum Analyzer without extender. (Leave DVM connected to A7TPl). 16. Set LINE switch to ON and key in @KKK) 1. DVM indication should be between +5.2 V dc and +6.0 V de. 17. Press 2 (RECALL 2). DVM indication should be between + 12.9 V dc and + 16.9 V dc. Disconnect DVM from A7TPl. 18.
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1I 15. 275 MHz Phase Lock Oscillator Adjustment A18 2 7 5 MHz PHASE LOCK OSCILLATOR C8 PLO,ADJUST 1 0 U A18 Figure 3-62. Location of 275 MHz PLO Adjustment 7. Disconnect test equipment from instrument.
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16. Second IF Amplifier and Third Converter Adjustment Reference Description RF Section: A19 Second IF Amplifier A20 Third Converter A synthesized sweeper is used to inject a signal of 301.4 MHz at -20 dBm in to the A19 Second IF Amplifier. The output of the amplifier is displayed on a scalar network analyzer. The amplifier is adjusted for a bandpass of greater than 7 MHz and less than 14 MHz centered at 301.4 MHz. Its gain should be greater than 14 dB and less than 17 dB.
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16. Second IF Amplifier and Third Converter Adjustment Adapters: Type N (f) to APC-3.5 (f) . . . . . . . . . . . . . . . . . . . . . . 1250-1745 Type N (m) to BNC (f) (2 required) . . . . . . . . . . . . . 1250-0780 Type N (f) to BNC (f) (2 required) . . . . . . . . . . . . . . 1250-1474 APC 3.5 (f) to APC 3.5 (f) . . . . . . . . . . . . . . . . . . . . . 1250-1749 Cables: BNC to SMB Snap-On (Service Accessory) (2 required) . 85680-60093 BNC 122 cm (48 in) (3 required) . . . . . . . . . . . . . . . . . .
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16. Second IF Amplifier and Third Converter Adjustment See Figure 3-65 for the typical response when the bandpass filter is properly adjusted. 14. On the scalar network analyzer, press @CEEQ MAX. Press cursor A, ON and set the cursor to the -3 dB point on the low side of the filter response (ho.1 dB). 15. Press cursor A and set the cursor to the -3 dB point on the high side on the filter response. The cursor A should read 0 fO.l dB.
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16. Second IF Amplifier and Third Converter Adjustment Note Place the Markers as accurately as possible within the cursor markers for maximum frequency accuracy. 18. On the synthesized sweeper, press @G-X-n). M3 - M4 should read between 7 and 14 MHz. 19. On the synthesized sweeper, press [MKR] OFF and @iW] OFF. 20. Set the synthesized sweeper FREQUENCY MARKERS (M1) to 251.4 MHz and IIv12) to 351.4 MHz. 21. Set the Scalar Network Analyzer (ml to 10 dB and set IREF) (REF LEVEL) to + 14 dB.
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16. Second IF Amplifier and Third Converter Adjustment 17. Pilot Second IF Amplif’ier Adjustments Reference Description RF Section: A9 Pilot Second IF Amplifier A10 Pilot Third Converter A synthesized sweeper is used to inject a signal of 269 MHz at -20 dBm into the A9 Pilot Second IF Amplifier. The output of the amplifier is displayed on a scaler network analyzer. The amplifier is adjusted for a bandpass of greater than 21 MHz centered at 269 MHz and a gain of greater than + 10 dB.
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17. Pilot Second IF Amplifier Adjustments Procedure 1. Position instrument on right side as shown in Figure 3-67, with bottom cover removed. 2. Set LINE switch to ON and press GNST (DUT), HP 8757A, and HP 8340A/B. PRESET) on HP 8568B 3. Connect 20 dB Attenuator and power splitter to RF OUTPUT of synthesized sweeper. Connect one arm of power splitter to R input of scalar network analyzer through detector as shown in Figure 3-67. 4.
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17. Pilot Second IF Amplifier Adjustments A9 P I L O T 2ND I F A M P L I F I E R \ A10 P I L O T 3RD C O N V E R T E R I 269MHz BANDPASS F I L T E R / Figure 3-68. Location of 269 MHz Bandpass Filter Adjustments 3 > 2 1 dB Point MHz -4 Figure 3-69. 269 MHz Bandpass Filter Adjustments Waveforms 15. On the scalar network analyzer, press [CURSOR) MAX. Press cursor A, ON and set the cursor to the -3 dB point on the low side of the filter response (fO.1 dB). 16.
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18. Frequency Control Adjustments 18. Frequency Control Adjustments Reference Related Performance Tests Description RF Section: A22 Frequency Control Sweep Time Accuracy Test Frequency Span Accuracy Test Center Frequency Readout Accuracy Test The sweep reference voltage is adjusted and then the sweep times are adjusted for proper tolerances. The sweep tune voltage is adjusted. Then the YTO DAC, VT0 DAC, and LSD VT0 DAC are adjusted, each to within its tolerance.
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18. Frequency Control Adjustments START FM SPAN A22 FREOUENCY CONTROL STOP TILT YTO -SD VT0 TlJNE R E F REF FAST A22 Figure 3-71. Location of Frequency Control Adjustments 5. Connect DVM to A22TP13 and ground to A22TP12. 6. Adjust A22 TUNE REF A22R17 for DVM indication of -10.285 AO.001 V dc. See Figure 3-71 for location of adjustment. Start-Up Time Measnremtwt 7. Key in [CENTER FREQUENCY) 10 MHz, CFREQUENCY A [CLEAR-WRITE), Sweep @‘i!i?Z], Scale LIN. 8. Key in Isv\ IEEP TIME) Is, Marker I-1.
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18. Frequency Control Adjustments Full Sweep Adjustment 11. Repeat Start-Up Time Measurement procedure in step 8 and step 9 for (SWEEP TIME ) of 20 ms. Note value of measurement. 20 ms start-up time: 12. Key in [Shift_) CREssWr three times and note the CRT annotation. The annotation should indicate SWEEP GEN measured sweeptime of (20 ms + start-up time noted in step ll)*O.l ms.
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18. Frequency Control Adjustments 22. Key in (ml [CF STEP SIZE) J 1023 Hz. 23. Adjust A22 LSD VT0 A22R7 for DVM indication of +0.0218 f0.0001 V dc. If not using an HP 3455A DVM, adjust for specified voltage plus the DVM indication in step 20. See Figure 3-71 for location of adjustment. 24. On the HP 3456A, press INIATH) (ZJ err. START and STOP Adjustments 25. Connect frequency counter to rear-panel 1ST LO OUTPUT connector. 26.
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19. Second Converter Adjustments 19. Second Converter Adjustments Reference Related Performance Test Description RF Section: A23 RF Converter RF Gain Uncertainty Test Spurious Responses Test First, the second LO frequency is adjusted for proper frequency and then the LO shift is adjusted by using the front-panel keys to shift the LO up and down. Next, the Pilot IF Bandpass Filter is adjusted for proper bandpass and amplitude, then the signal IF Bandpass Filter is adjusted.
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19. Second Converter Adjustments Procedure 1. Remove A23 RF Converter assembly from HP 8568B Spectrum Analyzer. Removal and installation procedures are contained as a repair procedure in the RF Section of the Troubleshooting and Repair Manual, Volume 1. 2. Position instrument on right side as shown in Figure 3-72 with the RF Converter removed but with cables still connected. Second LO Frequency and Shift Adjustments 3. Set HP 8568B Spectrum Analyzer LINE to ON and press (JNSTR PRESET].
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19. Second Converter Adjustments 9. Readjust A23A3 2ND MIXER A23A3Z4 for maximum power indication. 10. Disconnect the amplifier’s input from A23A3J3 and connect to A23A3J4. 11. Adjust A23A3 PILOT 2ND MIXER A23A3Z8 for maximum power meter indication. See Figure 3-73 for location of adjustment. 12. Disconnect power meter and connect frequency counter to amplifier’s output. 13. Key in [SHIFT) @) u to shift Second LO up and ISHIFT) a T to shift Second LO down. 14.
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19. Second Converter Adjustments Second Converter Bandpass Filter Adjustments 27. Key in m (JJ) T, [ FREQUENCY SPAN ] 0 Hz. 28. On the synthesized sweeper, key in ICF) 240 MHz, a 50 MHz, and CPowerLeVel] - 10 dBm. 29. Connect the synthesized sweeper’s SWEEP OUTPUT (rear panel), Z-AXIS BLANK/MKRS (rear panel), and PULSE MODULATION INPUT (front panel) to the proper rear-panel connectors on the scalar network analyzer as shown in Figure 3-73. 30.
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19. Second Converter Adjustments Figure 3-74. Typical PILOT 2ND IF Bandpass (SHIFT t) Figure 3-75. Typical PILOT 2ND IF Bandpass (SHIFT 1) Key in [*] 0) u and note amplitude of signal. Key in ISHIFT) @a T and note amplitude of the bandpass signal peak. 43. Continue to key in [SHIFT] 0) u then a T while adjusting A23A3Z8 for maximum amplitude and the same amplitude in both states of the Second LO l tcO.25 dB. 42. 44. Check the bandpass at the 3 dB points for both the 2ND LO 1 and 1.
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19. Second Converter Adjustments 48. Disconnect cable connected to A23A3J2 and connect to A23A3Jl (1ST IF IN). Reconnect semi-rigid cable to A23A3J2 that was disconnected in step 36. 49. Set the synthesized sweeper’s a for 2052.5 MHz ho.1 MHz. Adjust a to center the bandpass signal. 50. Adjust A23A3 Zl, 22, 23, and L2 for best bandpass shape and flatness at maximum amplitude of signal displayed on Scalar network analyzer.
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19. Second Converter Adjustments Second Converter Final Adjustments 53. Repeat steps 14 through 19 to ensure that Second LO frequency and shift are still properly adjusted. 54. Check the bandpass at the 3 dB points for both the 2ND LO T and 1. On the scalar network analyzer, press [%i?%@ Max. Press cursor A a and set the cursor at the -3 dB point 50.1 dB. Press cursor A, cursor A, and set the cursor to the corresponding -3 dB point on the opposite side of the signal. The cursor should now read 0 kO.1 dB.
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20. 50 MHz Voltage-Tuned Oscillator Adjustments Reference Related Performance Test Description RF Section: All 50 MHz Voltage-Tuned Oscillator (VTO) Frequency Span Accuracy Test Center Frequency Readout Accuracy Test First, the voltage reference for the Shaping network is set by measuring the voltage required to tune the 50 MHz Oscillator to its high limit (57.5 MHz) and then setting the reference voltage (+ 15 VR) to that voltage.
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20. 50 MHz Voltage-Tuned Oscillator Adjustments DACS Accuracy Check 3. Connect DVM to A22TP9 and ground lead to A22TP12. 4. Key in [SHIFT) [CF STEP SIZE] J 0 Hz. If using an HP3456A DVM, pressISTORE_)aZ, way, a, (STORE)@JY, then @El 0 (X-Z)/Y. If not using an HP 3456A DVM, note voltage indication for reference later. 5. Key in [m] [CF STEP SIZE) J 1023 kHz. 6. If using an HP 3456A DVM, voltage indication should typically be be + 10.230 fO.O1O V de.
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20. 50 MHz Voltage-Tuned Oscillator Adjustments 14. Adjust All POS SUPPLY AllR6 for a DVM indication the same as that noted in step 12. See Figure 3-79 for location of adjustment. VT0 High-Frequency End Adjustment 15. Key in LSHIFT) (CF STEP SIZE] J 112 kHz and Cm) I-1 N. 16. Adjust All OFFSET AllRlO for VTP frequency indication 28.000 MHz f0.005 MHz. 17. Key in ISHIFT) [CF STEP SIZE) J 12 kHz and [SHIFT) I-1 N. 18. Adjust All GAIN AllR9 for VT0 frequency indication of 28.750 MHz fO.005 MHz. 19.
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2 1. Slope Compensation Adjustments 21. Slope Compensation Adjustments Reference RF Section: A22 Frequency Control Related Performance Test Frequency Response Test Description The HP 8568B Spectrum Analyzer is swept between 10 MHz and 1500 MHz, using a synthesized sweeper which has been power-meter leveled.
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2 1. Slope Compensation Adjustments Procedure 1. Place instrument on right side as show in Figure 3-80, and remove bottom cover. 2. Connect equipment as shown in Figure 3-80 with power splitter connected to the output of the synthesized sweeper with a cable. Connect one arm of the splitter directly to the SIGNAL INPUT of the HP 8568B Spectrum Analyzer, using a Male-to-Male adapter, and the other arm to the power sensor. 3. Connect the power meter’s recorder output to the HP 8340A/B’s LEVELING EXT INPUT.
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21. Slope Compensation Adjustments Note At this sweep time, some trace discontinuities are common. 14. Adjust A22R66 TILT for best flatness (clockwise rotation increases the power slope), and trigger two sweeps on the synthesized sweeper. See Figure 3-81 for the location of A22R66. Compare the resultant trace with the specification. Continue adjusting A22R66 until best flatness is achieved. Note Best flatness is achieved when the maximum number of frequency points are on or near the -14 dBm reference.
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22. Comb Generator Adjustments Reference Description RF Section: A23 RF Converter Al6 20 MHz Reference The output of the Pilot First Converter is connected to the signal input of the Second Converter. This allows the comb teeth from the A23A6 Comb Generator to be displayed on the CRT display. The phase lock flags are disabled, using a shift key function to prevent the instrument from “locking up” due to the phase lock loops being open.
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22. Comb Generator Adjustments Equipment Cable, SMA (m) to SMA (m) . . . . . . . . . . . . . . . HP 85680-20094 Procedure 1. Set instrument LINE switch to ON and press ~NSTR PRESET). 2. Connect CAL OUTPUT to SIGNAL INPUT 2. 3. Key in (ATTEN) CCENTER FREQUENCY ) 0 dB, LOG 20 MHz, [FREQUENCY 2 dB. SPAN ] 100 kHz, [ENTER dB/DIvj 4. Adjust front-panel AMPTD CAL for signal peak at top graticule line (-10 dBm). 5. Press QNSTR PRESET). 6. Key in [SHIFT) [RUN) “. This disables phase lock flags. 7.
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22. Comb Generator Adjustments a typical comb tooth display. See Figure 3-83 for location of adjustments. 14. The majority of the comb teeth should be above the -30 dBm Display Line. No comb teeth should exceed -22 dBm, and no comb teeth should be less than -36 dBm. 15. If unable to adjust comb teeth as described in previous steps, proceed with the next step. If comb teeth are adjusted properly, do not perform the adjustments in the following steps. Skip to step 21. 16.
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23. Analog-To-Digital Converter Adjustments 23. Analog-To-Digital Converter Adjustments Reference Description A3A8 Analog-to-Digital Converter The Analog-to-Digital Ramp Converter is adjusted at zero and full-scale by injecting a 0 V dc input and + 10 V dc input and adjusting the OFFS and GAIN controls until the ramp output at A3A8TPll toggles high to low.
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23. Analog-To-Digital Converter Adjustments Procedure 1. Position instrument upright as shown in Figure 3-85 and remove top cover. 2. Set LINE switch to ON and press Standard Procedure ~NSTR PRESET). 3. Procedure using Low-Noise DC Supply is illustrated in Figure 3-93. a. Key in [BLANK) TRACE A and SWEEP [S’NGLE]. b. Disconnect cable 0 (black) from sweep ramp input A3A8Jl. c. Short A3A8TP4 to A3A8TP5 or connect SMB snap-on short to A3A8J 1. d.
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23. Analog-To-Digital Converter Adjustments 1. Adjust A3A8R5 GAIN for a square wave displayed on the oscilloscope. The square wave should be approximately 4 V,,. See Figure 3-86 for location of adjustment. Alternate Procedure 4. Procedure without using Low-Noise DC Supply: a. Press QNSTR PRESET]. b. Key in TRACE A [BLANK] and SWEEP (SINGLE). c. Disconnect cable 0 (black) from sweep ramp input A3A8Jl. d. Short A3A8TP4 to A3A8TP5 or connect SMB snap-on short to A3A8Jl. e.
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24. Track and Hold Adjustments Reference Description A3A9 Track and Hold The CAL OUTPUT signal is connected to the RF INPUT. The instrument is placed in zero frequency span to produce a dc level output from the IF-Video section and this dc level is regulated by adjusting the reference level. The Offsets and Gains on the Track and Hold assembly are adjusted for proper levels using a DVM. SPECTRUM ANALYZER DIGITAL VDLTMETER Figure 3-87.
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24. Track and Hold Adjustments A6 AS ~EOM4LR ES I A6A9AlRll CAL ADJ I c29 TRIF ‘ L E R M A T C H RI1 CAL OUTPUT RlO A6A9Al Figure 3-88. Location of Track and Hold Adjustments 10. Key in m TRACE A [-HOLD]. b 11. Adjust A3A9R44 OFFS POS until MARKER A level indication as indicated by CRT annotation flickers back and forth between .OO and .lO dB. 12. Key in cm) TRACE A m d. 13. Adjust A3A9R36 OFS NEG until MARKER A level indication as indicated by CRT annotation flickers back and forth between .OO and .
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24. Track and Hold Adjustments 24. Adjust A3A9R52 GNEG for MARKER A level indication as indicated by CRT annotation of 100 ho.1 dB. 25. Repeat steps 4 through 24 until no further adjustments are required.
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25. Digital Storage Display Adjustments 25. Digital Storage Display Adjustments Reference Description A3A 1 Trigger A3A2 Intensity Control A3A3 Line Generator First, preliminary CRT graticule adjustments the graticule on the CRT. These preliminary repair has been performed on the associated has been performed on the assemblies listed preliminary adjustments are not necessary. are performed to position adjustments assume that circuitry.
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25. Digital Storage Display Adjustments A3Al TRIGGER A-IA? INTENSITY CONTROL A3A3 LINE GENERATOR A3A3 !12 -HRESH R51 Y 8 & H BAL A3A2 R34 SWP OFFSET R50 X S & H BAI A3Al Figure 3-90. Location of Digital Storage Display Adjustments 5. Adjust A3A2R12 LL THRESH fully clockwise. See Figure 3-90 for location of adjustment. 6. Adjust A3A3R6 XLL so that horizontal graticule lines just meet the vertical graticule lines at the left and right sides of the graticule.
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25. Digital Storage Display Adjustments Sample and Hold Balance Adjustments 13. Set LINE switch to STANDBY. 14. Place A3A3 Line Generator on extender boards. 15. Set LINE switch to ON. Press QNSTR PRESET]. 16. Key in C-1 0 ’ (RECORDER LOWER LEFT) 0 [Hz). Press [SHIFT] 0 1 (RECORDER UPPER RIGHT) 1028 a. 17. Connect oscilloscope to A3A3TP4. 18. Connect A3A3TPll to oscilloscope External Trigger Input and adjust oscilloscope controls for display as shown in Figure 3-91. 19.
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25. Digital Storage Display Adjustments 20. Connect oscilloscope to A3A3TP7. 21. Adjust A3A2R51 Y S&H BAL for minimum dc offset between the level of the signal inside the two pulses to the signal level outside the two pulses. 22. Set LINE switch to STANDBY. 23. Reinstall A3A3 Line Generator in instrument without extender boards. 24. Set LINE switch to ON. X and Y Offset and 25. Press (INSTR PRESET). Gain Adjustments 26, Key in [FREQUENCY SPAN] 0 Hz, [ SWEEP TIME ) 100 ps. 27.
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25. Digital Storage Display Adjustments 41. Adjust A3A3R5 Y GAIN to align the top graticule line with the fast sweep signal trace. Final Graticule Adjustments 42. Press QNSTR PRESET], TRACE A @iZQ. 43. Set A3A2R12 LL THRESH fully clockwise. 44. Adjust A3A3R6 XLL and A3A3R9 YLL to align horizontal and vertical lines so that each line meets the edge line (right, left, top, or bottom) but does not overshoot. 45. Adjust A3A2R12 LL THRESH fully counterclockwise. 46.
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Low-Noise DC SUPPlY The Low-Noise DC Supply shown in Figure 3-93 can be constructed using the parts listed in ‘Ikble 3-7. OUTPUT OVdc, t2Vdc o r +lO V d c Figure 3-93. Low-Noise DC Supply ‘Ihble 3-7. Parts for Low-Noise DC Supply - Reference/Designation HP Fart Number CD Description Cl 0160-2055 9 CAPACITOR FXD .Ol pf 3-150 Adjustments Jl 1250-0083 1 CONNECTOR BNC RI 0698-0083 8 RESISTOR FXD 1.96K 1% .125W R2 0757-0442 9 RESISTOR FXD 10K 1% .125W R3 0757-0442 9 RESISTOR FXD 10K 1% .
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Crystal Filter Bypass Network Configuration Crystal Filter Bypass Network Configuration The Crystal Filter Bypass Network Configuration shown in Figure 3-94 can be constructed using the parts listed in Iable 3-8 and Table 3-9. Table 3-8 list the parts required for the construction of 21.4 MHz IF crystal-filter bypass networks used with the A4A4 and A4A8 assemblies. Two 21.4 MHz bypass networks are required.
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Option 462 Introduction This chapter contains modified performance tests and adjustment procedures for Option 462 instruments. When working on Option 462 instruments, substitute the procedures in this chapter for the standard versions contained in chapters two and three. For earlier Option 462 instruments (HP 85662A serial prefixes below 3341A) in which impulse bandwidths are specified, use the tests and adjustment under “Impulse Bandwidths” .
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4. 6 dB Resolution Bandwidth Accuracy Test Related Adjustment Specification 6 dB Bandwidth Adjustments &20%, 3 MHz bandwidth &lo%, 30 Hz to 1 MHz bandwidths + 50%, -0%, 10 Hz bandwidth 30 kHz and 100 kHz bandwidth accuracy figures only applicable 590% Relative Humidity, 540” C. Description Equipment Procedure The 6 dB bandwidth for each resolution bandwidth setting is measured with the MARKER function to determine bandwidth accuracy. The CAL OUTPUT is used for a stable signal source. None required 1.
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4. Impulse and Resolution Bandwidth Accuracy Test Related Adjustment Specification Description Impulse Bandwidth Adjustments *20%, 3 MHz bandwidth flO%, 1 MHz to 1 kHz bandwidths -0, +50%, 300 Hz to 10 Hz (6 dB bandwidths) A frequency synthesizer and pulse/function generator are used to input pulses to the spectrum analyzer. The amplitude of the pulses is measured, and the impulse bandwidths are calculated for each impulse bandwidth from 3 MHz to 1 kHz.
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4. Impulse and Resolution Bandwidth Accuracy Test 17. Set the frequency synthesizer (FREQUENC‘ Tl to 30 kHz. On the spectrum analyzer key in [FREQUENCY SPP3011 Z, [SWEEP TIME] 0.5 seconds, SWEEP (SINGLEI), MA RKER ( PEAK SEARCH ). Record MARKER amplitude in Table 4 -2. 18. Calculate the Impulse BW of the 300 kHz filter using the formula in step 8. Record in Table 4-2. 19. Set the frequency synthesizer (FREQUENCY] to 1 MHz. Set the pulse/function generator WID to 100 ns. 20.
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4. Impulse and Resolution Bandwidth Accuracy Test Note 6 dB resolution bandwidth measurements are used in Performance Test 5, Impulse and Resolution Bandwidth Selectivity Test. REF -9.0 dBm b LINEAR ATTEN HKR A 10 129 3.103 MHZ 0.00 dB Figure 4-3. 6 dB Resolution Bandwidth Measurement 46. Select the spectrum analyzer [BW] and FREQUENCY SPAN) settings according to Table 4-3.
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4. Impulse and Resolution Bandwidth Accuracy Test ‘Ihble 4-3.
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5. 6 dB Resolution Bandwidth Selectivity Test Related Adjustments Specification 3 MHz Bandwidth Filter Adjustments 21.4 MHz Bandwidth Filter Adjustments Step Gain and 18.
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5. 6 dB Resolution Bandwidth Selectivity Test 7. Vary spectrum analyzer settings according to Table 4-4. Press SWEEP @KZF] and measure the 60 dB bandwidth for each resolution bandwidth setting by the procedure of steps 4 through 6. Record the value in Table 4-4. 8. Record the 6 dB bandwidths from Table 4-l in ‘Ikble 4-4. 9. Calculate the bandwidth selectivity for each setting by dividing the 60 dB bandwidth by the 6 dB bandwidth.
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5. 6 dB Resolution Bandwidth Selectivity Test ‘Ikble 4-4.
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5. Impulse and Resolution Bandwidth Selectivity Test e REF 0 . 0 aBm Al-TEN HKR P i 4.04 HHZ - 0 . 30 a0 10 d0 1 0 aw / \ / I. Figure 4-5. 60 dB Bandwidth Measurement 4. Press MARKER In] and position the positive movable marker 60 dB down from the signal peak on the negative-going edge of the signal trace (the MARKER @J amplitude readout should be 0.00 dB *0.50 dB). 5.
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5. Impulse and Resolution Bandwidth Selectivity Test ‘Ihble 4-5.
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6. Impulse and Resolution Bandwidth Switching Uncertainty Tkst Related Adjustment 3 MHz Bandwidth Filter Adjustments 21.4 Bandwidth Filter Adjustments Down/Up Converter Adjustments Specification f2.0 dB, 10 Hz bandwidth f0.8 dB, 30 Hz bandwidth f0.5 dB, 100 Hz to 1 MHz bandwidth * 1 .O dB, 3 MHz bandwidth 30 kHz and 100 kHz bandwidth switching uncertainty figures only applicable 190% Relative Humidity. Description The CAL OUTPUT signal is applied to the input of the spectrum analyzer.
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6. Impulse and Resolution Bandwidth Switching Uncertainty Test rp REF 53.0 d0m I I ATTEN I I 10 I ldB’ t-H+ M A R
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Test 4. 6 dB Resolution Bandwidth Accuracy Test (p/o ‘lhble 2-19, Performance Test Record) Step 8. 6 dB Resolution Bandwidth Accuracy ‘RES) Readout of 3 dB Bandwidth FREQUENCY SPAN) Min 4-18 Option 462 Actual Max 3MHz 5MHz 2.400 MHz 3.600 MHz 1MHz 2 MHz 900kHz 1.100 MHz 300kHz 500kHz 270.0 kHz 330.0 kHz 100kHz 200kHz 90.0 kHz 110.0 kHz 30kHz 50kHz 27.00 kHz 33.00 kHz 10kHz 20kHz 9.00 kHz 11.00 kHz 3kHz 5kHz 2.700 kHz 3.300 kHz 1kHz 2 kHz 900Hz 1.
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Test 4. Impulse and Resolution Bandwidth Accuracy Test (p/o ‘Ihble 2-19, Performance Test Record) Test 4. Impulse and Resolution Bandwidth Accuracy Test (p/o able 2-19, Performance Test Record) Steps 1 through 38. Impulse Bandwidth Accuracy Marker Readouts for: @ai-- Calculated Impulse Bandwidth High Frequency Low Frequency Minimum Actual Maximum Repetition Rate Repetition Rate 3 MHz (i) 3 MHz 2.40 MHz 3.60 MHz 1 MHz (i) 3 MHz 900 kHz 1.
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Test 4. Impulse and Resolution Bandwidth Accuracy Test (p/o ‘Ihble 2-19, Performance Test Record) Steps 39 through 46.
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Test 5. 6 dB Resolution Bandwidth Selectivity (p/o lkble 2-19, Performance Test Record) Test 5. 6 dB Resolution Bandwidth Selectivity (p/o ‘lhble 2-19, Performance lkst Record) Step 9.
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Test 5. Impulse and Resolution Bandwidth Selectivity (p/o I)dble 2-19, Performance T&t Record) Steps 5 through 9.
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Test 6. Impulse and Resolution Bandwidth Switching Uncertainty (p/o ‘Ikble 2-19, Performace Test Record) - ‘l&t 6. Impulse and Resolution Bandwidth Switching Uncertainty (p/o Table 2-19, Performace lkst Record) Step 5. Impulse and Resolution Bandwidth Switching Uncertainty Deviation Allowable (MKR A Deviation Readout, dB) WV Res BW Frequency Span 1 MHz (i) 5 MHz 3 MHz (i) 5 MHz xt 1.0 300 kHz (i) 5 MHz It 0.5 100 kHz (i) 500 kHz * 0.5 30 kHz (i) 500 kHz zt 0.5 10 kHz (i) 50 kHz xt 0.
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9. 6 dB Resolution Bandwidth Adjustments Reference Related Performance Test Description Equipment Procedure IF-Display Section A4A9 IF Control 6 dB Resolution Bandwidth Accuracy Test The CAL OUTPUT signal is connected to the RF INPUT. Each of the adjustable resolution bandwidths is selected and adjusted for the proper bandwidth. No test equipment is required for this adjustment. 1. Position the instrument upright and remove the top cover. 2. Set the LINE switch to On, press SIGNAL INPUT 1.
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9. 6 dB Resolution Bandwidth Adjustments 13. Using the DATA knob, adjust the marker down one side of the display signal to the 6 dB point; CRT MKR A annotation indicates .500 x. A4A9 IF CONTROL \ ,I N I f’ 1 N N 5 s x : 2 VI-m-m ~000000000000000000 n 000000000000000000 r A4A9 Figure 4-7. Location of Bandwidth Adjustments 14. Adjust A4A9R61 1 MHz for MKR A indication of 500 kHz while maintaining the marker at 0.500 X using the DATA knob. Refer to Figure 4-7 for the adjustment location. 15.
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9. 6 dB Resolution Bandwidth Adjustments 24. Press MARKER IOFF), then MARKER In]. 25. Using the DATA knob, adjust the marker down one side of the displayed signal to the 6 dB point; CRT MKR annotation indicates .500 x. 26. Adjust A4A9R65 10 kHz for MKR A indication of 5.00 kHz while maintaining the marker at .500 X using the DATA knob. Refer to Figure 4-7 for the adjustment location. 27. Press MARKER @. Adjust the marker to the 6 dB point on the opposite side of the signal (CRT MKR A annotation indicates 1.
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9. Impulse Bandwidth Adjustments 9. Impulse Bandwidth Adjustments Reference Related Performance Test Description Equipment Procedure IF-Display Section A4A9 IF Control Impulse Bandwidth Accuracy Test The CAL OUTPUT signal is connected to the SIGNAL INPUT 1. Each of the adjustable resolution bandwidths is selected and adjusted for the proper impulse bandwidth. No test equipment is required for this adjustment. 1. Position the instrument upright and remove the top cover. 2.
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9. Impulse Bandwidth Adjustments 13. Using the DATA knob, adjust the marker down one side of the display signal to the 7.3 dB point; CRT MKR A annotation indicates 0.430 X. A4A9 IF CONTROL \ 1 1 Figure 4-8. Location of Bandwidth Adjustments 14. Adjust A4A9R61 1 MHz for MKR A indication of 500 kHz while maintaining the marker at 0.430 X using the DATA knob. Refer to Figure 4-8 for the adjustment location. 15. Press MARKER @.
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9. Impulse Bandwidth Adjustments LEVEL] and using the DATA knob to place the signal peak near the top of the graticule. [REFERENCE 24. Press MARKER IOFF), then MARKER (al. 25. Using the DATA knob, adjust the marker down one side of the displayed signal to the 7.3 dB point; CRT MKR annotation indicates 0.430 X. 26. Adjust A4A9R65 10 kHz for MKR A indication of 5.00 kHz while maintaining the marker at 0.430 X using the DATA knob. Refer to Figure 4-8 for the adjustment location. 27. Press MARKER Ia].
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5 Option 857 Introduction This chapter contains a modified performance test for Option 857 instruments. When working on Option 857 instruments, substitute the procedure in this chapter for the standard version contained in Chapter 2. The procedure included in this chapter is listed below: Performance Tests Test 12, Amplitude Fidelity Test.. . . . . . . . . . . . . . . . . . . . . . . . .
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12. Option 857 Amplitude Fidelity Test Related Adjustment Specification Log Amplifier Adjustments Log: Incremental fO.l dB/dB over 0 to 80 dB display Cumulative 3 MHz to 30 Hz Resolution Bandwidth: 54~0.6 dB max over 0 to 70 dB display (20 - 30°C). sf1.5 dB max over 0 to 90 dB display 10 Hz Resolution Bandwidth: sf0.8 dB max over 0 to 70 dB display (20 - 30°C). sk2.
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12. Option 857 Amplitude Fidelity Test Equipment Procedure Frequency Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3335A Adapter, Type N (m) to BNC (f) . . . . . . . . . . . . . . . . . . . . . . HP 1250-0780 (2) BNC to BNC cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A Log Fidelity 1. On the spectrum analyzer, connect the CAL OUTPUT to INPUT 2. Press IRECALL) @ and adjust the FREQ ZERO pot for maximum amplitude. 2.
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12. Option 857 Amplitude Fidelity Test ‘Ikble 5-1. Log Amplitude Fidelity (10 Hz RBW; Option 857) Frequency 1 2 Fidelity Error Cumulative Cumulative Synthesizer Calibrated MARKER A Amplitude (Column 2 - Column 1) Error Error Amplitude Amplitude WI GW 0 to 80 dB 0 to 90 dB Step Pm) WI WY + 10 0 0 (ref) 0 (ref) 0 (ref) -10 -10 -20 -20 -30 -30 -40 -40 -50 -50 -60 -60 -70 -70 -80 -80 -90 <*l.O dB sf1.5 dB 12.
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12. Option 857 Amplitude Fidelity Test 20. Subtract the greatest negative fidelity error from the greatest positive fidelity error for calibrated amplitude steps from -10 dB to -70 dB. The results should be SO.6 dB. dB 21. Subtract the greatest negative fidelity error from the greatest positive fidelity error for calibrated amplitude steps from -10 dB to -90 dB. The results should be 1.1.5 dB. dB ‘Ihble 5-2.
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12. Option 857 Amplitude Fidelity Test ‘lhble 5-3. Linear Amplitude Fidelity Allowable Range Frequency MARKER A Synthesizer Amplitude (413% of Reference Level) Amplitude (-1 WV 1 (dBm) ( .
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Performance Test Record Hewlett-Packard Company Tested by Model HP 8568B Report No. Serial No.
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Test 12. Option 857 Amplitude Fidelity Test Step 9. Log Amplitude Fidelity (10 Bz RBW; Option 857) 1 2 Fidelity Error Frequency Zumulative Cumulative Error Error Synthesizer Calibrated MARKER A Amplitude (Column 2 - Column 1) Amplitude Amplitude 0 to 80 dB 0 to 90 dB W-9 (W Step WW WV W) +lO 1 (ref) 0 -10 -10 -20 -20 -30 -30 -40 -40 -50 -50 -60 -60 -70 -70 -80 -80 -90 0 (ref) 0 (ref) <*l.O dB sf1.5 dB Step 18.
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Test 12. Option 857 Amplitude Fidelity Test Step 26. Linear Amplitude Fidelity Allowable Range Frequency MARKER A Synthesizer Amplitude (1t3% of Reference Level) Amplitude W) (dB) WW Min Max 0 - 10.87 -9.21 -10 -23.10 -17.
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6 Major Assembly and Component Locations IF-Display Section Figure Index See Figure Assembly AlAl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6 AlA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4, 6-5 AlA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4, 6-5 AlA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4 AlA . . . . . .
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W24 W25 W26 W27 W28 W29 W32 RF Section Figure Index 6-2 ................................................ ................................................ ................................................ ................................................ ................................................ ................................................ ................................................ 6-7 6-7 6-7 6-7 6-7 6-7 6-7 Assembly See Figure A5AlJl . . . . . . . . . . . . . . . . . . . . . . . . . . .
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A26F2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3 A26F3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3 A26F4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3 A26F5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3 A26Ql . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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c5 c4 c3 c2 A26 w43 / c Figure 6-l.
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423A2 w14 w3 ASA A543 W2 ( INPUT SELECT) w43 45A2 A5A 1 w31 A5AlJl 427 W42 A5Rl (KEYBOARD) Figure 6-2.
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A26 Fl -15v 1 5A F2 F3 -5v +2ov 3A 1 .5A F4 +5v 6A F5 +;I$ I WI4 A5i4 A?4 A533 Ai 01 Al 1 020403 d9 A5’J 1 05 AiSl Figure 6-3.
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AlAlOCl AlAlOC4 \ AlA AlA A \.\ \ I ‘i r8 AlA FLi AITI AlAlOC2 AlAlOC3 AlA W7 A4A9 A4A8 A4A7 A4A6 w21 AlA AIAI 1 W6 w21 A4A5 A4A4 A4A3 A4A2 A4Al A3A9 AlA A3A8 A3A7 A3A6 A3A5 AlVl A3A4 A:A3 A3A2 A3Al AlA Figure 6-4.
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AlAlOCl AlA AlA A l AlAS Fl 1 AITI AlAlOC4 AlAlOC2 AlAlOC3 A4A3 w21 A4A8 A4A7 A4A6 A4A5 A4A4 A4A3 A4A2 A4Al AlA AlVl AlA i ‘A3Al 0 0 0 > Figure 6-5.
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,w3 AlVl w9 Figure 6-6.
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AlAlO I /’ A A /w2g /W24 A4AlO / W28 W8 ‘W23 ‘W32 ( S N 3004A and above) \ A3AlO / I W24 w23 Figure 6-7.