OPERATION AND SERVICE ANUAL SPECTRUM ANALYZER
Hewlett-Packard Company certifies that this product met its published specifications at the time o f shipment from the factory. Hewlett-Packard further certij?es that its calibration measurements are traceable to the United States National Bureau of Standards, to the extent allowed b y the Bureau's calibration facility. and t o the calibration facilities of other International Standards Organization members.
HEWLETT PACKARD OPERATION AND SERVICE MANUAL 8559A SPECTRUM ANALYZER 0.1 - 21 GHz SERIAL NUMBERS This manual applies directly to instruments with serial numbers prefixed 2347A. With modifications described in Section VII, this manual also applies to instruments with serial number prefixes 1909A through 2320A. For additional information about serial numbers, see INSTRUMENTS COVERED BY MANUAL in Section I.
CONTENTS Section Page I GENERAL INFORMATION . . . . . . . . . . . . . . 1-1 Introduction . . . . . . . . . . . . . . . . . . . . 1-1 1-1. 1-3. Description . . . . . . . . . . . . . . . . . . . . 1-1 1-6. Manual Organization . . . . . . . . . . . . . . 1-1 1-9. Specifications . . . . . . . . . . . . . . . . . . . 1-1 1-11. Safety Considerations . . . . . . . . . . . . . . 1-2 1-13. Instruments Covered by Manual . . . . . . . 1-2 1-14. Serial Numbers . . . . . . . . . . . . . . . . . 1-2 1-16.
CONTENTS Section Page 5-29. Cal Output and Ref Level Cal Adjustments . . . . . . . . . . . . . . . . . . 5-66 5-30. Frequency Display Adjustments . . . . . . 5-69 VI REPLACEABLE PARTS . . . . . . . . . . . . . . . . 6-1 Introduction . . . . . . . . . . . . . . . . . . . . 6-3. Replaceable Parts List . . . . . . . . . . . . . 6-6. Ordering Information . . . . . . . . . . . . . . VII MANUAL BACKDATING CHANGES . . . . . . . . 7- 1 7-1. Introduction . . . . . . . . . . . . . . . . . . . .
GENERAL INFORMATION MODEL 8559A SAFETY SYMBOLS The following safety symbols are used throughout this manual and in the instrument. Familiarize yourself with each of the symbols and its meaning before operating this instrument. Instruction manual symbol. The instrument will be marked with this symbol when it is necessary for the user to refer to the instruction manual in order to protect the instrument against damage.
GENERAL INFORMATION ADAPTER 1250-0780 MODEL 8559A SIDE STOP K I T 08558-60131 SPECTRUM ANALYZER OVERLAY K I T 5060-0319 FIGURE 1-1.
GENERAL INFORMATION MODEL 8559A SECTION I GENERAL INFORMATION 1-1. INTRODUCTION 1-2. This Operation and Service manual contains information required to install, operate, test, adjust, and service the Hewlett-Packard 8559A Spectrum Analyzer. Figure 1-1 shows the instrument and accessories supplied. This section covers instrument identification, description, options, accessories, specifications, and other basic information. 1-3. DESCRIPTION 1-4.
GENERAL INFORMATION 1-11. SAFETY CONSIDERATIONS 1-12. Before operating this instrument, you should familiarize yourself with the safety markings on the instrument and safety instructions in this manual. This instrument has been manufactured and tested according to international safety standards. However, to ensure safe operation of the instrument and personal safety of the user and service personnel, the cautions and warnings in this manual must be followed.
MODEL 8559A GENERAL INFORMATION TABLE 1-1. HP MODEL8569ASPECIFICATIONS (1 OF 4) SPECIFICATIONS FREQUENCY SPECIFICATIONS FREQUENCY RANGE 10 MHz to 21 GHz, covered in six pushbuttonselectable ranges: Frequency Band GHz Mixing Mode (n) Highest Lowest Freq (GHz) Freq [ALT IF] (GHz) 3.060 0.010 [0.025] 9.060 6.035 [6.020] 9.120 3.033 [3.048] 15.120 9.058 [9.043] 15.180 6.055 [6.070] 21.000 12.080 [12.
GENERAL INFORMATION MODEL 8559A TABLE 1-1. HP MODEL 8559A SPECIFICATIONS (2 OF 4) Maximum lnput (without damage) Levels Total Power: +20 dBm (O.lW, 2.2 Vrms) with 0 dB input attenuation +30 dBm (lW, 7.1 Vrms) with 2 10 dB input attenuation DC: +-7.1V AC (
GENERAL INFORMATION MODEL 8559A TABLE 1-1. HP MODEL 8559A SPECIFICATIONS(3 OF 4) Display Fidelity CRT linearity and log or linear fidelity affect amplitude accuracy at levels other than Reference Level. Log Incremental Accuracy: +0.1 dB per dB from Reference Level Log Maximum Cumulative Error: I + 1.5 dB over entire 70-dB range Linear Accuracy: + 3% of Reference Level RESIDUAL RESPONSES < -90dBm (0.01-3.06 GHZ)~with 0 dB input attenuation and no signal present at input.
GENERAL INFORMATION MODEL 6559A TABLE 1.1. HP MODEL8559A SPECIFICATIONS(4 OF 4) DIMENSIONS HP Model 8559A Spectrum Analyzer: HP Model 182T Display: I 201.6 17 15/16) I! Note: Dimensions in millimeten and (inches). 34.9 TOP 498.5 (19 5 1-1 1 8 ) (17 13116)-4 HP Model 181T Display: HP Model 853A Display: I 200 (7 7/01 Note Dlmenr~onrIn m~lllmeterr and Imches) 38 1$ L 5 3 0 +l11/2) Note: Dimensions in millimeters and (~nches). C R E A R [ TOP^-] (21 1,4)-~ p-491.
MODEL 8559A GENERAL INFORMATION TABLE 1-2. MODEL 8559N180-SERIESSUPPLEMENTALCHARACTERISTICS (1 OF 3) SUPPLEMENTAL CHARACTERISTICS NOTE: Values in this table are not specifications. They are typical characteristics included for user information. FREQUENCY CHARACTERISTICS AMPLITUDE CHARACTERISTICS FREQUENCY ACCURACY Frequency Cal Adjusts digital FREQUENCY GHz readout. FREQUENCY CAL control may be used to calibrate the frequency readout on a known signal or on the 35 MHz CAL OUTPUT signal.
GENERAL INFORMATION MODEL 8559A TABLE 1-2. MODEL8559A/180-SERIES SUPPLEMENTAL CHARACTERISTICS (2 OF 3) SUPPLEMENTAL CHARACTERISTICS NOTE: Values in this table are not specifications. They are typical characteristics included for user information. Third Order IntermodulationDistortion Relative Disortion 1 -30 dBm 50 kHz lnput SWR <2.0 SWR with 0dB input attenuation <1.3 SWR with r 10 dB input attenuation LO Emission (3.0 - 6.
MODEL 8559A GENERAL INFORMATION TABLE 1-2. MODEL 8559N180SERIESSUPPLEMENTAL CHARACTERISTICS(3OF 3) SUPPLEMENTAL CHARACTERISTICS NOTE: Values in this table are not specifications. They are typical characteristics included for user information. AUX C 21.4 MHz IF OUTPUT BNC output provides 21.4 MHz IF signal (linearly related to spectrum analyzer RF input) from a 50-ohm output impedance.
GENERAL INFORMATION 1-26. MODEL 8559A EQUIPMENT REQUIRED BUT NOT SUP- response flatness is degraded by less than &0.5 dB Display Mainframe from 100 MHz to 12.4 GHz; the limiter is usable from 10 MHz to 18 GHz. Invut levels of 1 watt average or 75 watts peak can be tolerated. PLIED 1-27. 1-28. An HP 853A digital Spectrum Analyzer Display is recommended for use with the HP 8559A.
MODEL 8559A GENERAL INFORMATION TABLE 1-3. PARTS INCLUDED IN MODIFICATION KIT 0018069503 Quantity 1-41. Description 1 1 Output Amplifier Assembly (Auxiliary Output Board) Label 2 1 314 inch pieces of shrink tubing Service Note SERVICE ACCESSORIES 1-42. Service accessories are shown in Figure 1-6. 1-43. HP Part Number RECOMMENDED TEST EQUIPMENT 00180-66551 7120-3116 0890- 0720 180A/AR-10,18OC/D-2,181A/AR8, 182A/C-1, or 184/B-1 (modification is similar for all instruments listed) 1-44.
GENERAL INFORMATION MODEL 8559A FIGURE 16.
GENERAL INFORMATION MODEL 8559A Item 1 2 3 4 5 6 7 8 9 10 11 12 13 Description Board Puller, 2 prongs to lift PC boards Extender Board, 6 pin, 12 contacts Extender Board, 10 pin, 20 contacts Extender Board, 12 pin, 24 contacts Extender Board, 22 pin, 44 contacts Extender Cable Assembly, for plug-in operation out of display mainframe Tuning Tool, modified 5116 inch nut driver with modified No. 10 Allen driver Alignment tool, metal tip in plastic Alignment tool, non-metallic Wrench, No.
GENERAL INFORMATION MODEL 8559A TABLE 1-4. RECOMMENDEDTESTEQUIPMENT(1OF 4) Instrument Critical Specifications Display Mainframe H P 180 Series with Variable Persistence Sweep Oscillator Mainframe for R F Plug-Ins below. External Sweep Adjustable Sweep range (Marker Sweep) R F Plug-In Recommended Model Compatible with mainframe above. Output Frequency: 0.01 to 2.
GENERAL INFORMATION MODEL 8559A TABLE 1-4. RECOMMENDEDTEST EQUIPMENT(2 OF4) instrument Oscilloscope Critical Specifications Recommended Model Frequency: 500 Hz Display Amplitude : -1 5 Vdc Single-Channel Frequency C o u n t ~ r Frequency Range : 2 0 MHz t o 23 GHz Sensitivity: -1 5 dBm Resolution: 0.1 MHz Universal Counter Time Interval Measurement from 1 ms t o 500 ms Digital Voltmeter Range: -12 t o + I 5 Vdc Accuracy: +I mV Power Meter Range : -20 to +10 dBm Resolution: 0.
MODEL 8559A GENERAL INFORMATION TABLE 14. RECOMMENDED TEST EQUIPMENTQOF 4) Instrument Critical Specifications Recommended Model Fixed Attenuator (2 required) Frequency Range : 10 MHz to 18 GHz Attenuation: 20 dB +I .O dB Connectors: Type N (m) ( f ) HP 8491B Option 0206 Fixed Attenuator Frequency Range: 10 MHz to 18 GHz Attenuation: 10 dB +0.5 dB Connectors: Type N (m) ( f ) HP 8491 B Option 0106 Crystal Detector Frequency Range: 10 MHz to 21 GHz Frequency Response: t 0 . 6 dB, .
GENERAL INFORMATION MODEL 8559A TABLE 1-4.
INSTALLATION AND OPERATION VERIFICATION MODEL 8559A SECTION II INSTALLATION AND OPERATION VERIFICATION 2-1. INTRODUCTION 2-2. This section includes information on initial inspection, preparation for use, and storage and shipping requirements for the HP 8559A. 2-8. To install the spectrum analyzer in the mainframe: Set display mainframe LINE switch to OFF. 2-3. INITIAL INSPECTION 2-4. Inspect the shipping container for damage.
INSTALLATION AND OPERATION VERIFICATION 2-12. MODEL 8559A 4. Place label on front panel of spectrum analyzer (upper right-hand corner) to indicate that the plug-in is secured with side stops. To install side stops: 2-13. To remove side stops: pZK.1 Before removing covers from display mainframe, disconnect line power by removing ac power cord. Remove side covers from bottom section of mainframe. (Remove only right side cover if mainframe is a rack-mounted model.
INSTALLATION AND OPERATION VERIFICATION MODEL 8559A 2-14. 2-17. Graticule Overlays Operating Environment 2-15. To install a graticule overlay: Select proper overlay. H P Part Number 50208565 is for H P 180TR display mainframes, H P Part Number 5020-8566 is for H P 181T/TR display mainframes, and H P Part Number 5020-8567 is for H P 182T display mainframes. 2-18. Temperature. This instrument has been type tested for 95 percent relative humidity at 40°C for five days.
INSTALLATION AND OPERATION VERIFICATION 2-21. STORAGE AND SHIPMENT 2-22. Environment MODEL 8559A Use a strong shipping container. A double-wall carton made of 350-pound test material is adequate. Use enough shock-absorbing material (3-inch to 4-inch layer) around all sides of the instrument to provide firm cushion and prevent movement inside the container. Protect the control panel with cardboard. 2-23.
INSTALLATION AND OPERATION VERIFICATION MODEL 8559A D H P Part No. Description CARTON- OUTER FOAM PADS-INNER MANUAL PAD- FRONT CARTON- INNER BAG-ANTISTATIC FIGURE 2-2.
OPERATION MODEL 8559A SECTION Ill OPERATION 3-1. INTRODUCTION 3-2. This section provides operating information for the HP 8559A Spectrum Analyzer plug-in. It also provides a brief description of display mainframe controls. For a detailed description of the display mainframe, refer to its manual. 3-3. The HP 8559A Spectrum Analyzer plug-in can be used with either the 180-series display mainframes or the HP 853A Spectrum Analyzer Display mainframe. 3-4. DESCRIPTION 3-5. HP 8559A Spectrum Analyzer 3-6.
MODEL 8559A OPERATION NOTE 3-17. The frequency group enables the operator to control how the Spectrum Analyzer displays the frequency domain. The RESOLUTION BW and FREQ SPAN/DIV controls, when pushed in, are coupled together, and moving either control moves the other. When the SWEEP TIME/DIV control is in the AUTO position, varying the RESOLUTION BW or the FREQ SPAN/DIV (coupled or uncoupled) will change the sweep time to maintain calibration.
OPERATION MODEL 8559A spectrum analyzer is calibrated for absolute amplitude and frequency measurements. Set the controls as shown in Table 1 before you start the adjustment procedure. Press and release the PLOT GRAT push button four times to step to digital test routine #4, as indicated by the "#4" displayed on the left side of the CRT. TABLE 1. ADJUSTMENT SElllNGS With an adjustment tool, adjust the FOCUS control as necessary to make the characters on the CRT as clear as possible.
OPERATION 3-31. Frequency and Amplitude Adjustments Adjust VERTICAL POSN to align the CRT trace with the bottom graticule line. Center the LO feedthrough (i.e., the "signal" at 0 MHz) on the CRT with the TUNING control. Narrow the FREQ SPAN/DIV to 200 kHz. Adjust the REF LEVEL FINE control as necessary to position the signal peak near the top CRT graticule line. Center the LO feedthrough again, if necessary, and adjust the FREQ ZERO to calibrate the FREQUENCY MHz readout at 00.0 MHz.
PERFORMANCE TESTS MODEL 8559A SECTION IV PERFORMANCE TESTS INSTRUMENTS TESTED 4-1. INTRODUCTION 4-3. 4-2. The procedures in this section test the electrical performance of the instrument using the specifications in Section I as the performance standards. The performance tests included in this section are listed in Table 4-1. Most of the tests can be performed without access to the interior of the instrument. If a test measurement is marginal, perform the appropriate adjustment procedures in Section V.
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS NOTE Perform the Front Panel Adjustment Procedure in Section Ill before proceeding with performance tests. Allow at least 30 minutes warmup time. 4-11. FREQUENCY SPAN ACCURACY SPECIFICATION: There are 14 calibrated spans ranging from 10 kHz per division to 200 MHz per division in a 1, 2, 5 sequence. Frequency error between-any twopoints on the display is within +. 5 percent of the indicated frequency separation.
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-11. FREQUENCY SPAN ACCURACY (Cont'd) PROCEDURE: 1. Set equipment controls as follows: Spectrum Analyzer: FREQUENCYBANDGHz .................................................. .01-3 TUNING ................................................................ 1.5GHz FREQSPAIWDIV ........................................................ 200MHz RESOLUTION BW ................................... OPTIMUM, coupled (pushed in) INPUTATTEN ..............................
PERFORMANCETESTS MODEL 8559A PERFORMANCE TESTS 4-11. FREQUENCY SPAN ACCURACY (Cont'd) Adjust spectrum analyzer TUNING control to position one spectral line (from comb generator) at first graticule line (left-hand edge of display). Measure the error between 17th spectral line and 9th graticule line as shown in Figure 4-2. Error should be no greater than +0.4 division. div 110.
MODEL 8559A PERFORMANCETESTS PERFORMANCE TESTS 4-11. FREQUENCY SPAN ACCURACY (Cont'd) f 0.4 DIVISION -d I 4 NINTH GRATICULE LlNE FIRST GRATICULE LINE NINTH SPECTRAL LlNE COMB SIGNALS FIRST SPECTRAL LlNE CENTERFREQUENCY FlGURE4-3. FREQUENCY SPAN ACCURACY MEASUREMENTFOR NINTH SPECTRAL LINE Set FREQ SPAN/DIV to 5 MHz. Adjust TUNING control to position one spectral line on the first graticule line. Measure the error between fifth spectral line and ninth graticule line.
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-11. FREQUENCY SPAN ACCURACY (Cont'd) 13. Set function generator frequency to 200 kHz (k0.5%) using frequency counter. Connect function generator output to comb generator MODULATION input. Set function generator OUTPUT LEVEL for a clean 200-kHz comb on the spectrum analyzer display. NOTE To obtain a clean comb on the spectrum analyzer display, use either the LOW or HIGH output of the function generator and readjust the OUTPUT LEVEL control as necessary.
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4.1 2. TUNING ACCURACY SPECIFICATION: 0.1 - 3.0 GHz: 3.0 - 21.0 GHz: + 0.3% of center frequency) + 0.2% of center frequency) -t (1 MHz -t (5 MHz DESCRIPTION: An external RF source is used to provide a frequency-calibrated input signal to the spectrum analyzer for three points on each frequency band. The digital FREQUENCY GHz readout is compared with the known test frequency to find the amount of readout (or tuning) error.
PERFORMANCETESTS MODEL 8559A PERFORMANCE TESTS 4-12. TUNING ACCURACY (Cont'd) PROCEDURE: Set spectrum analyzer controls as follows: FREQUENCYBANDGHz .................................................. .01-3 TUNING .............................................................. 0.035GHz FREQ SPAN/DIV ......................................................... 200 kHz RESOLUTION BW ................................... OPTIMUM, coupled (pushed in) INPUTAlTEN .....................................................
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-12. TUNING ACCURACY (Cont'd) NOTE The 10 dB attenuator should be connected directly to the INPUT 50Qof the spectrum analyzer and the 11667A power splitter (no cable assembly should be used between attenuator and analyzer or power splitter). 8. Adjust sweep oscillator for CW output at 3.000 GHz, as measured by frequency counter. Vary POWER LEVEL control as required for accurate measurement.
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-13. RESIDUAL FM SPECIFICATION: Less than 2 kHz peak-to-peak for a time interval 10.1 second; less than 2 kHz peak-to-peak in a 180-series display mainframe with 220/240 line voltage. DESCRIPTION: This test measures the inherent short-term instability (residual FM) of the LO system in the spectrum analyzer.
MODEL 8559A PERFORMANCETESTS PERFORMANCE TESTS 4-13. RESIDUAL FM (Cont'd) Comb Generator: COMB FREQUENCY - MHz ............................................... 100 MC INTERPOLATION AMPLITUDE - 1 MHz ...................................... OFF OUTPUT AMPLITUDE .............................................. Full clockwise 2. Connect OUTPUT of comb generator to spectrum analyzer INPUT 50Qas shown in Figure 4-5. NOTE The 8559A is sensitive to vibration.
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-14. NOISE SIDEBANDS SPECIFICATION: Noise sidebands are at least 70 dB below a CW signal, 30 kHz or more away from the signal with a 1 kHz resolution bandwidth and full video filtering. DESCRIPTION: A stable 1.8 GHz CW signal is applied at a - 20 dBm level to the spectrum analyzer and displayed on the CRT The amplitudes of noise-associated sidebands and unwanted responses near the signal are measured.
MODEL 8559A PERFORMANCE TESTS PERFORMANCE TESTS 4-14. NOISE SIDEBANDS (Cont'd) Comb Generator: COMB FREQUENCY - MHz ............................................... 100 MC INTERPOLATION AMPLITUDE - 1 MHz ...................................... OFF OUTPUT AMPLITUDE .............................................. Full clockwise Connect equipment as shown in Figure 4-8. Adjust TUNING control to locate 1.8-GHz comb tooth on CRT Adjust REFERENCE LEVEL and REF LEVEL FINE controls to position peak of 1.
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-15. RESOLUTION BANDWIDTH ACCURACY SPECIFICATION: Individual resolution bandwidth 3-dB points are calibrated to +15% (+ 30% for 3 MHz bandwidth). DESCRIPTION: Resolution bandwidth accuracy is measured in the linear mode to eliminate log amplifier errors. Since signal level at the 3-dB points (half-power points) is related to peak signal level by a voltage ratio of 0.707:1.O, a peak level of 7.
PERFORMANCETESTS MODEL 8559A PERFORMANCE TESTS 4-15. RESOLUTION BANDWIDTH ACCURACY (Cont'd) PROCEDURE: Part of this test must be performed with power supplied to the instrument and with protective covers removed. The test should be performed only by sewice-trained personnel who are aware of the hazards involved. 1. Set equipment controls as follows: Spectrum Analyzer: FREQUENCYBANDGHz .................................................. .01-3 TUNING ......................................................
MODEL 8559A PERFORMANCE TESTS PERFORMANCE TESTS 4-15. 5. RESOLUTION BANDWIDTH ACCURACY (Cont'd) Tune signal generator frequency until trace drops to 5 divisions above graticule baseline. Record signal generator frequency. MHz 6. Tune signal generator frequency in direction opposite to that of step 5 until trace peaks (7.1 divisions above graticule baseline) and then drops to 5 divisions above graticule baseline. Record signal generator frequency.
MODEL 8559A PERFORMANCE TESTS PERFORMANCE TESTS 4-15. RESOLUTION BANDWIDTH ACCURACY (Cont'd) D l SPLAY SIGNAL GENERATOR . RF OUTPUT FIGURE 4-10. RESOLUTION BANDWIDTH ACCURACY TEST SETUP, 30 kHz TO 1 kHz In the following procedure, the plug-in must be removed from the display mainframe and connected through the extender cable assembly. Be very careful; the energy at some points in the instrument will, if contacted, cause personal injury.
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-15. RESOLUTION BANDWIDTH ACCURACY (Cont'd) Signal Generator: COUNTERMODE .............................................. INT,EXPANDXlO AM ........................................................................ OFF FM ........................................................................ OFF FREQUENCYTUNE .................................................... 21.4MHz RF ..........................................................................
MODEL 8559A PERFORMANCETESTS PERFORMANCE TESTS 4-15. RESOLUTION BAN DWlDTH ACCURACY (Cont'd) 19. Set RESOLUTION BW to 3 kHz, leaving FREQ SPAN/DIV set to 0. Repeat steps 14 through 17. Min. Actual 2.5 kHz Max. 3.45 kHz 20. Set RESOLUTION BW to 1 kHz, leaving FREQ SPAN/DIV set to 0. Repeat steps 14 through 17. Min. Actual 0.5 kHz 21. Leave signal generator connected to A16J3 if continuing on with next performance test. Max. 1.
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-16. RESOLUTION BANDWIDTH SELECTIVITY SPECIFICATION: 60-dB/3-dB resolution bandwidth ratio: <15: 1 DESCRIPTION: The 60-dB bandwidth is measured for all resolution bandwidths. The 60- to 3-dB resolution bandwidth ratio (shape factor) is then computed for each bandwidth by dividing the 3-dB value (from the Resolution Bandwidth Accuracy test) into the 60-dB value. In the 30-, lo-, 3-, and 1-kHz bandwidths, a 21.
MODEL 8559A PERFORMANCE TESTS PERFORMANCE TESTS 4-16. RESOLUTION BANDWIDTH SELECTIVITY (Cont'd) PROCEDURE: 1. Set equipment controls as follows: Spectrum Analyzer: FREQUENCYBANDGHz .................................................. .01-3 TUNING ............................................................. >O.OlOGHz FREQSPAN/DIV ............................................................... 0 RESOLUTIONBW ......................................................... lkHz INPUTATTEN ........................
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-16. 5. RESOLUTION BANDWIDTH SELECTIVITY (Cont'd) Tune signal generator in direction opposite to that of step 4 until trace peaks (top graticule line) and then drops to 2 divisions above graticule baseline. Record signal generator frequency. MHz 6. Calculate and record resolution bandwidth at 60-dB points (difference between frequencies recorded in steps 4 and 5). kHz 7. Set RESOLUTION BW to 3 kHz, leaving FREQ SPAN/DIV set to 0.
MODEL 8559A PERFORMANCE TESTS PERFORMANCE TESTS 4-16. RESOLUTION BANDWIDTH SELECTIVITY (Cont'd) Signal Generator: COUNTERMODE .............................................. INT,EXPANDXlO AM ....................................................................... OFF FM ........................................................................ OFF FREQUENCYTUNE ...................................................... 35MHz RF ..........................................................................
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-16. RESOLUTION BANDWIDTH SELECTIVITY(Cont'd) Set RESOLUTION BW to 300 kHz, leaving FREQ SPAN/DIV set to 0.Repeat steps 14 through 18. kHz Set RESOLUTION BW to 1 MHz, leaving FREQ SPAWDIV set to 0. Repeat steps 14 through 18. MHz Select ALT IF (switch pushed in). Set RESOLUTION BW to 3 MHz, leaving FREQ SPAN/DIV set to 0. Repeat steps 14 through 18. MHz Return ALT IF switch to OFF position.
MODEL 8559A PERFORMANCETESTS PERFORMANCE TESTS 4-17. AVERAGE NOISE LEVEL SPECIFICATION: The maximum average noise level for each frequency band, with 1 kHz resolution bandwidth and 0 dB attenuation, is given in Table 4-5. DESCRIPTION: The average noise level of the spectrum analyzer is checked by observing the average noise power level displayed on the CRT when no input signal is applied to the instrument. -111 dBm LIMIT AVERAGE NOISE POWER LEVEL FIGURE 4-13, AVERAGE NOISE LEVEL MEASUREMENT, .
MODEL 8559A PERFORMANCETESTS PERFORMANCE TESTS 4-17. AVERAGE NOISE LEVEL (Cont'd) PROCEDURE: 1. Set spectrum analyzer controls as follows: FREQUENCYBANDGHz .................................................. .01-3 TUNING .............................................................. 0.010GHz FREQSPAN/DIV ............................................................... F RESOLUTION BW ............................................... 3 MHz, uncoupled INPUTATTEN ..............................................
PERFORMANCETESTS MODEL 8559A PERFORMANCE TESTS 4-17. AVERAGE NOISE LEVEL (Cont'd) NOTE Do not tune above 18.0 GHz for this step. 11. Repeat steps 2 through 5 for the frequency range of 18.0- 21.0 GHz. 12. Repeat entire procedure with ALT IF on. TABLE 4-5. AVERAGE NOISE LEVEL FREQUENCY BAND GHz Setting .01-3 6-9 3-9 9-15 6-15 12.1-21 12.1-21 Specified Frequency Range (G Hz) Reg. lF ALT I F 0.010-3.060 6.035-9.060 3.033-9.120 9.058-15.120 6.055-15.180 12.080-18.000 18 .OOO-2 1 .OOO 0.025-3.060 6.
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-18. RESIDUAL RESPONSES SPECIFICATION: Residual responses are less than - 90 dBm (0.01 - 3.06 GHz) with 0 dB input attenuation and no signal present at input. They are less than - 90 dBm (0.025 - 3.06 GHz) with ALT IF selected. DESCRIPTION: Signals present on the display without an input signal applied to the spectrum analyzer are residual responses. The .Ol - 3 GHz frequency band is checked for residual responses greater than - 90 dBm.
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-18. RESIDUAL RESPONSES (Cont'd) Terminate INPUT 5(M2connector with 50-ohm termination. Adjust TUNING control to position LO feedthrough signal on leftmost vertical graticule line. Set RESOLUTION BW control to 10 kHz, leaving FREQ SPAN/DIV set to 10 MHz. Adjust BL CLIP control clockwise until just the peaks of the noise are displayed. Set the SWEEP TRIGGER control to SINGLE and display PERSISTENCE control to MAX.
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS - 4-19. FREQUENCY RESPONSE SPECIFICATION: Frequency response measured with 0 or 10 dB of input attenuation includes input attenuator flatness, mixer flatness, and band-to-band amplitude variation. Table 4-6 shows the frequency response specifications. TABLE 48. FREQUENCY RESPONSE SPEClFiCATiONS Frequency Response (*dB Maximum) FREQUENCY BAND (GHz) DESCRIPTION: Frequency response is checked in each frequency band.
PERFORMANCETESTS MODEL 8559A PERFORMANCE TESTS 4-19. FREQUENCY RESPONSE (Cont'd) NOTE The HP 853A Spectrum Analyzer Display is not recommended for use in this procedure. The HP 8350A Sweep Oscillator may be substituted for the HP 8620C in this procedure, if necessary. EQUIPMENT: Variable Persistence/Storage Display . . Sweep Oscillator ......................................................... HP 8620C RF Plug-in ............................................................ HP 86222A RF Plug-in .........
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-19. FREQUENCY RESPONSE (Cont'd) Sweep Oscillator: CW Frequency ............. MARKERS ............... SWEEP MODE ............ SWEEP TRIGGER ......... SWEEP-TIME-SEC ........ RF OFF-ON ............... ALC Switch ............... POWER LEVEL ........... RF BLANKING (Rear Panel) . FM-NORM-PL (Rear Panel) . 1 kHz SQ WAVE (Rear Panel) . ....... 0.100GHz ............ OFF . AUTO (or TIME) ............ EXT ............. 100 ............ OFF ............ EXT ...
PERFORMANCETESTS MODEL 8559A PERFORMANCE TESTS 4-19. FREQUENCY RESPONSE (Cont'd) 4. Adjust spectrum analyzer TUNING control for a FREQUENCY GHz readout of 0.100. Set sweep oscillator to CW with frequency of 100 MHz and use CW control to center signal on spectrum analyzer display. 5. Calibrate and zero power sensor and meter. Disconnect power splitter from 20-dB attenuator and connect to power sensor. Adjust sweep oscillator POWER LEVEL control for a power meter indication of - 8 dBm. 6.
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-19. FREQUENCY RESPONSE(Cont'd) NOTE Use maximum possible ALC GAIN to avoid leveling errors during swept measurements. Do not adjust spectrum analyzer REF LEVEL FINE control or sweep oscillam tor POWER LEVEL control during the remaining steps of this performance test. 14. Adjust spectrum analyzer TUNING control fully counterclockwise to position tuning marker at low end of selected frequency band. Set sweep oscillator CW control to 2.
MODEL 8559A PERFORMANCE TESTS PERFORMANCE TESTS 4.19. FREQUENCY RESPONSE (Cont'd) Frequency Response, 3 - 18 GHz NOTE For the higher frequency bands, multiple responses may appear on spectrum analyzer display during frequency response measurement. Adjust INTENSITY control as necessary for optimum display of in-band signal peaks. 17. Select 6 - 9 GHz frequency band on spectrum analyzer. Set sweep oscillator to CW and frequency to 7.5 GHz. Use CW control to center signal on spectrum analyzer display.
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS -- 4-19. 21. 22. 23. 23. 25. FREQUENCY RESPONSE (Cont'd) Select 9 - 15 GHz frequency band on spectrum analyzer. Set sweep oscillator to CW and frequency to 12.0 GHz. Use CW control to center signal on spectrum analyzer display. Trigger a 6 GHz sweep. Adjust spectrum analyzer TUNING control to reposition tuning marker. Trigger another sweep.
MODEL 8559A PERFORMANCE TESTS PERFORMANCE TESTS 4-19. 26. FREQUENCY RESPONSE (Cont'd) Subtract mean deviation of step 16 from maximum and minimum values recorded in step 25. Frequency response for 12.1 - 18 GHz portion of 12.1 - 21 GHz frequency band should not exceed + 2.3 dB ( + 2.3 divisions). Maximum divisions (12.1 - 18 GHz) Minimum divisions (12.1 - 18 GHz) Frequency Response, 18 - 21 GHz Disconnect power splitter from 20-dB attenuator and connect it to the power sensor.
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-19. FREQUENCY RESPONSE (Cont'd) TABLE 4-7. CORRECTING FOR FREQUENCY RESPONSE OF SIGNAL SOURCE Frequency (G Hz) Power Meter lndication (d Bm) Deviation from Center Graticule Line (divisions or dB) Power Deviation* (dB) Sum of Deviations (dB) Deviation from Mean (dB) Sum of Deviations (dB) Deviation from Mean (dB) 0 (Ref .) 18.0 *deviation relative to power meter indication at 18.0 GHz, recorded in step 27. EXAMPLE(MEAN DEVIATION OF -0.
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-20. GAlN COMPRESSION SPECIFICATION: Gain compression is less than 0.5 dB for a - 10 dBm input level with 0 dB attenuation. DESCRIPTION: Gain compression is measured by changing the power level at the spectrum analyzer input from -20 dBm to - 10 dBm. The displayed signal level will change by less than 10 dB, indicating gain compression in the input mixer.
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-20. GAIN COMPRESSION (Cont'd) PROCEDURE: 1. Set equipment controls as follows: Spectrum Analyzer: FREQUENCYBANDGHz .................................................. .01-3 TUNING .............................................................. 0.050GHz FREQ SPAN/DIV ......................................................... 100 kHz RESOLUTION BW .............................................. 300 kHz, uncoupled INPUTATTEN ...................................
MODEL 8559A PERFORMANCE TESTS PERFORMANCE TESTS 4-20. GAIN COMPRESSION (Cont'd) Adjust signal generator OUTPUT LEVEL control for a power meter reading of - 10 dBm ( - 20 dBm at spectrum analyzer 50Q connector). Set spectrum analyzer INPUT ATTEN control to 0 dBm, REFERENCE LEVEL control to - 20 dBm, and REF LEVEL FINE control to 0. Adjust REF LEVEL CAL control to place peak of signal at reference graticule line of step 4.
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4.21. BANDWIDTH SWITCHING (AMPLITUDE VARIATION) SPECIFICATION: Bandwidths 3 MHz to 300 kHz: < + 0.5 dB Bandwidths 3 MHz to 1 kHz: < + 1.O dB DESCRIPTION: The CAL OUTPUT signal is applied to INPUT 50Q connector and displayed on CRT. The peak of displayed 35-MHz signal is centered on CRT and adjusted for a vertical deflection of several divisions. The amplitude variation of the signal is measured for each RESOLUTION BW control setting.
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-21. BANDWIDTH SWITCHING (AMPLITUDE VARIATION) (Cont'd) TABLE 4-8.
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-22. INPUT ATTENUATOR ACCURACY SPECIFICATION: Step Accuracy (0 dB to 60 dB): < k 1.0 dB per 10-dB step, 0.01 to 18.0 GHz Maximum Cumulative Step Error (0 dB to 60 dB): < 2.4 dB, 0.01 to 18.0 GHz DESCRIPTION: The input attenuator accuracy is tested over the range of 0 to 60 dB using an RF substitution method. A step attenuator that has been calibrated at 30 MHz by a Standards Laboratory is used for substitution.
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-22. INPUT ATTENUATOR ACCURACY (Cont'd) PROCEDURE: Connect equipment as shown in Figure 4-17 and set controls as follows: Spectrum Analyzer: FREQUENCY BAND GHz .................................................. .01- 3 TUNING ................................................................. 30MHz FREQSPAN/DIV .......................................................... 2MHz RESOLUTIONBW .........................................................
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4.22. INPUT ATTENUATOR ACCURACY (Cont'd) TABLE 4-9. INPUT AllENUATOR ACCURACY INPUT ATTEN Setting (dB) I Step Attenuator Setting (dB) Amplitude Deviation (dB) Step Attenuator Error (Calibration)" Corrected Deviation (dB) *Attenuations > dial settings are positive (+). Attenuations < dial settings are negative (-). For example, 9.99 dB calibration for a 10 dB attenuator setting represents an error of -0.01 dB.
MODEL 8559A PERFORMANCE TESTS PERFORMANCE TESTS 4-23. REFERENCE LEVEL ACCURACY SPECIFICATION: Step Accuracy (steps referenced with 0 dB input attenuation): +0.5 dB - 10 dBm to - 80 dBm: -10dBmto-100dBm: +1.0dB Vernier Accuracy: f0.5 dB DESCRIPTION: The reference level accuracy is tested over the range of - 10 dBm to - 100 dBm by checking the IF gain steps in 1 dB/DIV (Log) and in LIN. The resulting maximum deviation in each case must be less than k0.5 dB from - 10 dBm to - 80 dBm and less than k 1.
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-23. REFERENCE LEVEL ACCURACY (Cont'd) PROCEDURE: Step Accuracy in Log Mode Set equipment controls as follows: Spectrum Analyzer: FREQUENCYBANDGHz .................................................. .01-3 TUNING ................................................................. 30MHz FREQ SPAN/DIV ......................................................... 100 kHz RESOLUTION BW ................................................ 30 kHz, uncoupled INPUTATTEN ...
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-23. REFERENCE LEVEL ACCURACY (Cont'd) TABLE 4-10. IF GAIN ACCURACY IN LOG MODE REFERENCE LEVEL Setting (dBm) Step Attenuator Setting (dB) Deviation from 6th Division (dB) Step Attenuator Error (Calibration)" (dB) o 0 (Ref) (Ref) Corrected Deviation (dB) 10 20 30 40 50 60 70 80 90 > *Attenuations dial settings are positive (+). Attenuations < dial settings are negative (-). For example, 9.
PERFORMANCETESTS MODEL 8559A PERFORMANCE TESTS 4-23. REFERENCE LEVEL ACCURACY (Cont'd) TABLE 4-11. IF GAIN ACCURACY IN LINEAR MODE REFERENCE LEVEL Setting (d Bm) Step Attenuator Setting (dB) -10 Deviation from 6th Division Linear Mode (div.) Deviation from 6th Division in dB* Step Attenuator Error :Calibration)**(dB) Corrected Deviation (dB) 0(Ref.) 0(Ref.) Ref. 0(Ref.) -20 -30 -40 -50 -60 -70 -80 -90 -100 I I *Use Table 4-1 2 to convert deviation in linear mode t o deviation in dB.
MODEL 8559A PERFORMANCE TESTS PERFORMANCE TESTS 4-23. REFERENCE LEVEL ACCURACY (Cont'd) Vernier Accuracy 9. Replace 10-dB step attenuator with 1-dB step attenuator. Set spectrum analyzer controls as follows: FREQUENCY BAND GHz .................................................. .01- 3 TUNING .............................................................. 0.030GHz FREQSPAN/DIV .......................................................... 50kHz RESOLUTION BW ..............................................
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-24. SWEEP TlME ACCURACY SPECIFICATION: There are 20 selectable and calibrated sweep times in a 1-2-5 sequence from 2 pec/DIV to 10 sec/DIV (excluding 2 sec/DIV). Sweep time accuracy: +10% ( f20% for 5 and 10 sec/DIV) DESCRIPTION: For SWEEP TIME/DIV control settings of 10 msec and less, the triangle-wave output of a function generator is used to modulate a 100-MHzsignal applied to the spectrum analyzer input.
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-24. SWEEP TIME ACCURACY (Cont'd) PROCEDURE: 1. Set equipment controls as follows: Spectrum Analyzer: FREQUENCY BAND GHz .................................................. .01 - 3 TUNING .............................................................. 0.100GHz FREQSPAWDIV ......................................................... 10MHz RESOLUTION BW ............................................... 3 MHz, uncoupled INPUTATTEN .................................
PERFORMANCETESTS MODEL 8559A PERFORMANCE TESTS 4-24. SWEEP TIME ACCURACY (Cont'd) 2. Connect equipment as shown in Figure 4-19. Connect counter's B 10 MHz input to the function generator low output and the signal generator's AM input. 3. Adjust spectrum analyzer TUNING control to center 100-MHz signal on CRT Set FREQ SPAWDIV control to 0, leaving RESOLUTION BW control at 3 MHz setting. Set SWEEP TIME/DIV control to 2 psec. 4. Set AM switch of HP 8640B to AC position.
PERFORMANCETESTS MODEL 8559A PERFORMANCE TESTS 4-24. SWEEP TIME ACCURACY (Cont'd) TABLE 4-14, SWEEPTIMEACCURACY, 2pSECTHROUGH 10 MSEC SWEEP TIMEIDIV Setting 9. 10. Function Generator Frequency (Approx.1 Minimum 250 kHz 1.80 psec Sweep Time per Division Actual Maximum 2.20 psec 2 psec 5 psec 200 kHz 4.40 psec 5.50 psec 10 psec 100 kHz 9.00 psec 11.OO psec 20 psec 50 kHz 18.OO psec 22.00 psec 50 psec 20 kHz 45.OO psec 55.OO psec .1 msec 10 kHz 90.0 psec 110.0 psec .
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-24. SWEEP TIME ACCURACY (Cont'd) TABLE4-15. SWEEPTIME ACCURACY, 20 MSECTHROUGH 10SEC WEEP TIMEIDIV Setting Minimum 20 msec 0.180 sec -sec 0.220 sec 50 msec 0.450 sec sec 0.550 sec .1 sec 0.90 sec sec 1.10 sec .2 sec 1.80 sec sec 2.20 sec .5 sec 4.50 sec se c 5.50 sec 1 sec 9.0 sec Sweep Time I Actual I Maximum 11.0 sec 5 sec 40.0 sec 60.0 sec 10 sec 80.0 sec 120.
MODEL 8559A PERFORMANCE TESTS PERFORMANCE TESTS 4-25. CALIBRATOR OUTPUT ACCURACY SPECIFICATION: Amplitude: - 10 dBm + 0.3 dB Frequency: 35 MHz + 400 kHz DESCRIPTION: The frequency of the calibrator output signal is measured with a microwave counter. The calibrator output level is measured using a power meter. SPECTRUM ANALYZER FREQUENCY COUNTER I INPUT POWER METER 1-I 0 y:;; @.a@@ ... 0 ..
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-26. , DISPLAY FIDELITY SPECIFICATION: Log Incremental Accuracy: f0.1 dB per dB from Reference Level Log Maximum Cumulative Error: < +_ 1.5 dB over entire 70-dB range Linear Accuracy; t- 3% of Reference Level DESCRIPTION: The amplitude of the log display amplifier is tested by connecting a DVM to the display (AUX A) VERTICAL OUTPUT connector.
MODEL 8559A PERFORMANCETESTS PERFORMANCE TESTS 4-26. DISPLAY FIDELITY (Cont'd) FREQ SPAN/DIV ......................................................... 500 kHz RESOLUTION BW .............................................. 300 kHz, uncoupled INPUT ATTEN ............................................................. 10 dB REFERENCE LEVEL ....................................................... 0 dBm REFLEVELFINE .............................................................. 0 Amplitudescale .................
PERFORMANCE TESTS MODEL 8559A PERFORMANCE TESTS 4-26. DISPLAY FIDELITY (Cont'd) TABLE 4-16. AMPLITUDE LOG DISPLAY ACCURACY Attenuator Setting (dB) DVM Reading (mV) Corrected DVM Reading* (mV) Theoretical Reading (mV) Theoretical Reading Subtracted From Corrected D V M Reading (m V) Difference Between Adjacent Readings (m V) Theoretical Reading Subtracted From Corrected D V M Reading (mV) Difference Between Adjacent Readings (mV) +800 (Ref.
MODEL 8559A PERFORMANCE TESTS PERFORMANCE TESTS 4-26. DISPLAY FIDELITY (Cont'd) Algebraically subtract each converted reading (Theoretical Reading Subtracted from Corrected DVM Reading) from previous converted reading. Record results in Table 4-16 (see sample computations). Maximum difference between adjacent readings should not exceed + 10 mV, corresponding to f1 dB/10 dB or +0.1 dB/dB. Divide maximum value by 100 to calculate Log Incremental Error (in dB/dB).
MODEL 8559A PERFORMANCE TESTS TABLE 4-18. PERFORMANCE TEST RECORD (1 OF 4) HewlettPackard Company Model 8559A Spectrum Analyzer .01-21 GHz Tested by Serial No. Date Results Para. No. Test Description Min Actual Max Frequency Span Accuracy 3. 4. 5. 6. 7. 8. 9. 10. 11. 14. 15.
MODEL 8559A PERFORMANCE TESTS TABLE 4-18. PERFORMANCE TEST RECORD(2 OF 4) Results Para. No. 4.13. Test Description Min 1.4 div (2 kHz1O.l sec) Noise Sidebands 7.0 div down (-70 dB) 6. Noise Sidebands 4-15. Resolution Bandwidth Accuracy 7. 8. 9. 10. 1 1. 17. 18. 19. 20. 4-16. 3 MHz Resolution BW 3 MHz Resolution BW (ALT IF) 1 MHz Resolution BW 300 kHz Resolution BW 100 kHz Resolution BW 30 kHz Resolution BW 10 kHz Resolution BW 3 kHz Resolution BW 1 kHz Resolution BW 2.10 MHz 2.
PERFORMANCE TESTS MODEL 8559A TABLE 4-18. PERFORMANCE TEST RECORD(3 OF 4) Results Para. No. Test Description Min. Residual Responses 6. Residual Responses, .Ol GHz to 3 GHz 7. Residual Responses, .Ol GHz to 3 GHz (ALT IF) Frequency Response 15. 18. 20. 22. 24. 26. 32. Frequency Response, .Ol to 3.0 GHz Frequency Response, 6.0 to 9.0 GHz Frequency Response, 3.0 to 9.0 GHz Frequency Response, 9.0 to 15.0 GHz Frequency Response, 6.0 to 15.0 GHz Frequency Response, 12.1 to 18.
PERFORMANCE TESTS MODEL 8559A TABLE 4-18. PERFORMANCE TEST RECORD (4 OF 4) Para. No. Results Test Description Min. Actual Max. Sweep Time Accuracy 7. Sweep Time, 2 psecldiv 8. Sweep Time, 5 psec/div Sweep Time, 10 psecldiv Sweep Time, 20 psecldiv Sweep Time, 50 psecldiv Sweep Time, . l msec/div Sweep Time, .2 msecldiv Sweep Time, .5 msec/div Sweep Time, 1 msecldiv Sweep Time, 2 msec/div Sweep Time, 5 msec/div Sweep Time, 10 msecldiv 1.80 psec 4.50 psec 9 .OO psec 18.00 psec 45 .OO psec 90.
MODEL 8559A ADJUSTMENTS SECTION V ADJUSTMENTS 5-1. INTRODUCTION 5-2. This section describes the adjustments used to restore the HP 8559A to its peak operating condition after a repair or to compensate for changes resulting from component aging. Illustrations showing the appropriate test setups are included in the adjustment procedures. Table 5-1 lists all the adjustments by adjustment name, adjustment reference designator, and by the paragraph number of the adjustment procedure.
MODEL 8559A ADJUSTMENTS 5-13. RELATED ADJUSTMENTS 5- 14. These adjustments should be performed when the troubleshooting information in Section VIII indicates that an adjustable circuit is not operating correctly. Perform the adjustments after repair or replacement of the circuit. The troubleshooting procedures and Table 5-2 specify the required adjustments. 5-15. FACTORY SELECTED COMPONENTS 5-16. Table 5-3 is a list of factory selected components used in the H P 8559A.
ADJUSTMENTS MODEL 8559A TABLE5-1. ADJUSTABLECOMPONENTS(1 OF 3) - Adjustment Name Reference Designator GAIN OFFSET A1 A2R28 A1 A2 R29 2nd MIXER MATCH z1 A5L2 ASZl 22 23 2nd LO FREQUENCY 3 GHz A5Z2 A5Z3 - lov +14.5V 6 GHz C 6 GHz F MO Adjustment Paragraph Description --- A5Z4 A7 R8 A7R29 A7 R4 1 A7 R47 A7 R7 5 A7 R81 Adjusts DPM high indication. Adjusts DPM low indication. Adjusts Second Converter output match. Adjusts First I F Bandpass Filter Response.
MODEL 8559A ADJUSTMENTS TABLE 5-1. ADJUSTABLE COMPONENTS (2 OF 3) I Adjustment Name Reference Designator A1 lC38 Adjustment Paragraph Description Adjusts symmetry of second crystal bandwidth filter stage. Adjusts centering of second LC bandwidth filter stage LC CTR A l lC45 CTR A1 lC54 Adjusts centering of second crystal bandwidth filter stage. A1 lC73 Dip adjusts first LC bandwidth filter stage. Dip adjusts second LC bandwidth filter stage. Adjusts LC feedback of bandwidth filter.
MODEL 8559A ADJUSTMENTS TABLE 5-1. ADJUSTABLE COMPONENTS (3 OF 3) Adjustment Name Reference Designator ldjustment Paragraph Description LOG GAIN Adjusts dc offset circuitry at output of Log Amplifier Assembly A14 for 10 dB steps in log mode. 1 dB (offset) Adjusts LOG 10 dB/DIV translation. Adjusts variable gain amplifier for 0 dB with REF LEVEL FINE control set to 0 dB.
ADJUSTMENTS MODEL 8559A TABLE 5-2.
ADJUSTMENTS MODEL 8559A rReference Designator TABLE 53. FACTORY SELECTED COMPONENTS IN ALPHA-NUMERICALORDER Basis of Selection Adjusts bias on DPM Clock Oscillator. Selected to provide delay compensation for main coil sweeps. Adjusts YTO sweep linearity. Adjusts YTO sweep linearity. Selected t o provide delay compensation for FM coil swept spans. Selected to optimize Main Coil Span Accuracy. Selected to optimize Main Coil Span Accuracy. Shifts adjustment range of A8R34 REG.
ADJUSTMENTS MODEL 8559A TABLE 5-4. HP PART NUMBERS OF STANDARD VALUE REPLACEMENT COMPONENTS (1 OF 3) CAPACITORS R A N G E : 1 t o 24 pF TYPE: Tubular TOLERANCE: 1 to 9.1 pF = k.
MODEL 8559A ADJUSTMENTS TABLE 5-4. HP PART NUMBERS OFSTANDARDVALUE REPLACEMENTCOMPONENTS(2 OF3) RESISTORS RANGE: 10 to 464K Ohms TYPE: Fixed-Film WATTAG E: . I 2 5 a t 1 25°C TOLERANCE: %1.0% Value (52) 10.0 11.o 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 .o 82.5 90.9 100 110 121 133 147 162 178 196 215 237 261 287 316 348 383 422 HP Part Number Value (a) HP Part Number Value (a) 2 1.5K 23.7K 26.1K 28.7K 31.6K 34.8K 38.3K 42.2K 46.4K 51.
ADJUSTMENTS MODEL 8559A TABLE 5-4. HP PART NUMBERS OF STANDARD VALUE REPLACEMENTCOMPONENTS(3 OF3) RESISTORS RANSE: 10 to 1.47M Ohms TYPE: Fixed-Film WATTAGE: .5a t 125°C TOLERANCE: * I % HP Part Number Value (52) HP Part Number Value (a) 4.64K 5.11K 5.62K 6.19K 6.8 1K 7.50K 8.25K 9.09K 10.OK 12.1K 13.3K 14.7K 16.2K 17.8K l9.6K 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.
ADJUSTMENTS MODEL 8559A ADJUSTMENTS - 5-17. POWER SUPPLY CHECKS AND ADJUSTMENTS REFERENCE: A7, A8, A9 Schematics DESCRIPTION: The + 14.5V and - 10V regulated power supplies on Frequency Control Assembly A7 are adjusted. The (dependent) - 12V power supply is then checked for proper dc output (with less than +50 mV variation) while the spectrum analyzer is tuned from 10 MHz to 3 GHz.
ADJUSTMENTS MODEL 8559A ADJUSTMENTS - 5-17. POWER SUPPLY CHECKS AND ADJUSTMENTS (Cont'd) PROCEDURE: 1. Set spectrum analyzer controls as follows: FREQUENCYBANDGHz .................................................. .01-3 TUNING .............................................................. 0.010GHz FREQ SPAN/DIV .......................................................... F (full) RESOLUTION BW ............................................... Optimum, coupled INPUTATTEN ....................................
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-17. POWER SUPPLY CHECKS AND ADJUSTMENTS (Cont'd) NOTE The two following voltage adjustments, + 10V and VO (Varactor Offset), must be performed while the spectrum analyzer is still cold (during first five minutes after turn-on). If the instrument has been operating longer than five minutes, turn off the display mainframe, remove A8 and A9 assemblies, and let them cool on bench for 15 minutes.
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-18. CALIBRATED SWEEP TIME ADJUSTMENT REFERENCE: A9 Schematic DESCRIPTION: A counter is used to adjust the time interval of the 1 millisecond per division and 5 milliseconds per division sweep times. Calibrated sweep times from 0.1 milliseconds through 50 milliseconds are then checked using the counter time-interval (T.I.) function. D l SPLAY COUNTER 0 MHz SPECTRUM ANALYZER FIGURE 5-2.
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-18. 1. CALIBRATED SWEEP TIME ADJUSTMENT (Cont'd) Set equipment controls as follows: NOTE If an HP 853A Spectrum Analyzer Display mainframe is used, and a sweep time faster than 10 msec is selected, an error message will appear on the analyzer's CRT and the analyzer will go into mixed mode. Spectrum Analyzer: FREQUENCYBANDGHz .................................................. .01-3 TUNING ............................................................ >0.
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-18. CALIBRATED SWEEP TIME ADJUSTMENT (Cont'd) NOTE In early instruments, A9R13 is labeled "2 ms." The adjustment of A9R13, however, should be performed with SWEEP TlMUDlV set at 5 ms. 5. Set spectrum analyzer SWEEP TIME/DIV control to 5 msec. Readjust counter SENSITIVITY controls as necessary and adjust 5 ms potentiometer A9R13 for a time interval indication of 50.00 + 4.00 ms. 6. Check time interval for each SWEEP TIME/DIV control setting listed in Table 5-5.
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-19. LOG AMPLIFIER LOG AND LINEAR ADJUSTMENTS REFERENCE: A14 and A15 Schematics DESCRIPTION: Step attenuators are used to change the level of the input signal to the spectrum analyzer in calibrated steps. The output of Vertical Driver and Blanking Assembly A15 is monitored, and adjustments are performed to calibrate Log Amplifier Assembly A14.
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-19. LOG AMPLIFIER LOG AND LINEAR ADJUSTMENTS (Cont'd) PROCEDURE: 1. Set equipment controls as follows: Spectrum Analyzer: FREQUENCY BAND GHz .................................................. .01 - 3 TUNING ............................................................. >O.OlOGHz FREQSPAN/DIV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 RESOLUTION BW ...................................
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-19. LOG AMPLIFIER LOG AND LINEAR ADJUSTMENTS (Cont'd) Disconnect signal generator output from step attenuator. Adjust spectrum analyzer VERTICAL POSN control to position signal trace at bottom CRT graticule line. Measure dc offset voltage at Al5TP1 and record. Connect signal generator to step attenuator and adjust signal generator FINE TUNE control to peak signal on CRT display.
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-19. LOG AMPLIFIER LOG AND LINEAR ADJUSTMENTS (Cont'd) TABLE 5-6. LOG FIDELITY CHECK Step Attenuator Setting (dB) DVM Reading (mV) Corrected DVM Reading* (mV) Test Limits (mV) Theoretical Reading (mV) Theoretical Reading Subtracted from Corrected DVM Reading (mV) * DVM reading minus offset recorded in step 4. '*All values in the Difference Between Adjacent Readings column must be less than o r equal t o f Difference Between Adjacent Readings*" (mv) 10 mV.
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-19. LOG AMPLIFIER LOG AND LINEAR ADJUSTMENTS (Cont'd) Linear Output and Linear Step Gain 20. Disconnect AlOWl from step attenuator and reconnect to A5J2. When reconnecting A1OW1 to A5J2, do not tighten to over 6 inch pounds of torque; A5J2 can be damaged if the connector is overtightened. Set spectrum analyzer controls as follows: INPUT ATTEN ............................................................. 10 dB REFERENCE LEVEL ......................................
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-19. LOG AMPLIFIER LOG AND LINEAR ADJUSTMENTS (Cont'd) Log Gain 24. Set spectrum analyzer controls as follows: REFERENCE LEVEL .................................................... Amplitudescale .......................................................... - 50 dBm ldb/DIV 25. Set 10-dB step attenuator to 0 dB. Retune spectrum analyzer to peak signal.
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-19. LOG AMPLIFIER LOG AND LINEAR ADJUSTMENTS (Cont'd) TABLE 5-10, LOG AMPLIFIER OUTPUT LIMITS Step Attenuator Setting (dB) DVM Reading (mV) Corrected DVM Reading* (mV) Test Limits (mV) Theoretical Reading (mV) Theoretical Reading Subtracted from Corrected D V M Reading (mv) * DVM Reading minus offset.
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-20. 1-dBOFFSET ADJUSTMENT REFERENCE: A 15 Schematic DESCRIPTION: Reference is set in 10 dB/DIV amplitude scale and 1 dB offset is adjusted in 1 dB/DIV for the same full display reference. D l SPLAY SPECTRUM ANALYZER EXTENDER CABLE ASSEMBLY 0.0 o... l NPUT OUTPUT ADAPTER FIGURE 5-4. 1-dB OFFSET ADJUSTMENTTEST SETUP EQUIPMENT: Adapter, Type N (m) to BNC (f) ......................................... H P 1250-0780 Extender Cable Assembly .........................
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-20. 2. 1-dB OFFSET ADJUSTMENT (Cont'd) Connect equipment as shown in Figure 5-4. 3. Adjust vertical position to align trace on bottom graticule. 4. Set tuning to 35 MHz. Set TUNING control to center the trace on the display. Set REF LEVEL FINE for a full-screen trace (signal at top graticule line). 5. Set Amplitude Scale to 10 dB/DIY Adjust VERT GAIN if necessary for full screen trace. 6 .
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-21. BANDWIDTH FILTER ADJUSTMENTS REFERENCE: A9, A1 1, and A13 Schematics DESCRIPTION: The crystal and LC bandwidth filter circuits are adjusted for symmetry, center, and peak. The 3-dB bandwidths are adjusted with Sweep Generator/Bandwidth Control Assembly A9 (paragraph 5-22). DISPLAY SPECTRUM ANALYZER EXTENDER CABLE ASSEMBLY .0 . o... l NPUT OUTPUT ADAPTER FIGURE 5-5.
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-21. BANDWIDTH FILTER ADJUSTMENTS (Cont'd) TERMINAL CONNECTORS FIGURE 5-6. CRYSTAL SHORT CONFIGURATION PROCEDURE: NOTE Allow 30 minutes warmup time before performing adjustments. 1. Set spectrum analyzer controls as follows: FREQUENCYBAND .................................................. .Ol-3GHz TUNING ................................................................. 35MHz FREQSPAN/DIV .........................................................
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-21. BANDWIDTH FILTER ADJUSTMENTS (Cont'd) Center the signal with TUNING control. Using REF LEVEL FINE control, place signal peak at 7.1 divisions (0.9 division from top graticule line). Adjust A9R85 LC until signal is five divisions wide at the fifth graticule line (1 MHz wide at 3-dB points). Set FREQ SPAN/DIV to 10 kHz and RESOLUTION BW to 10 kHz. Center the signal with FINE TUNING control. Using REF LEVEL FINE control, place signal peak at 7.1 divisions.
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-21. BANDWIDTH FILTER ADJUSTMENTS (Cont'd) CHECK CENTERING HERE (SPIKE IS CRYSTAL RINGING) CHECK SYMMETRY HERE (LOW ON SKIRTS) FIGURE 5-7. ADJUSTING CRYSTALSYMMETRY AND CRYSTAL CENTERING Remove crystal short from A13TP1/TP2 and connect it across A13TP4/TP5. Adjust A13C25 CTR for minimum signal amplitude. Then adjust A13C15 SYM and A13C25 CTR for a centered and symmetrical bandpass. Remove crystal short from A1 lTP4/TP5 and connect it across A13TPl/TP2.
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-21. BANDWIDTH FILTER ADJUSTMENTS (Cont'd) LC Alignment Accidentally shorting the case of A9Q1 (directly below A9TP6) to ANY test point will cause catastrophic failure to Sweep Generator Assembly A9. 24. Set RESOLUTION BW control to 100 kHz. Jumper A9TP6 to A9TP8. This forces the BW7 line to + 15Y Set FREQ SPAN/DIV to 100 kHz.
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-21. 26. BANDWIDTH FILTER ADJUSTMENTS (Cont'd) Short to ground A1 lTP3, A1 lTP6, and A13TP3. Set RESOLUTION BW to 100 kHz and set FREQ SPAN/DIV to 20 kHz. 27. Center signal on CRT with TUNING control. Adjust A13C45 LC CTR for symmetrical bandpass display on CRT Use FINE TUNING control to keep crystal spike centered. NOTE The crystal spike represents the center frequency of the crystal poles. In this procedure we are aligning the LC poles with the crystal poles.
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-21. BANDWIDTH FILTER ADJUSTMENTS (Cont'd) Adjust FINE TUNING and REF LEVEL FINE controls for a centered signal at 7 divisions from bottom graticule line. Remove shorts from A13TP3 and A13TP6 and center signal with FINE TUNING control. Adjust A13R26 LC for a signal amplitude of 7 divisions. Replace shorts on A13TP3 and A13TP6. Remove shorts from A1 lTP3 and A1 1TP6. Adjust A1 1R26 LC for a signal amplitude of 7 divisions.
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-22. 3.dB BANDWIDTH ADJUSTMENTS REFERENCE: A9 Schematic DESCRIPTION: The 3-dB bandwidths for the 3 MHz through the 30 kHz RESOLUTION BW settings are adjusted using the CAL OUTPUT as the signal source. The 3-dB bandwidths for the 10 kHz, 3 kHz, and 1 kHz RESOLUTION BW settings are adjusted by injecting a stable 321.4 MHz signal into the Third Converter (A10) of the spectrum analyzer.
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-22. 3-dB BANDWIDTH ADJUSTMENTS (Cont'd) PROCEDURE: Set spectrum analyzer controls as follows: FREQUENCYBAND ................................................. 0.01-3GHz TUNING ................................................................. 35MHz FREQSPAN/DIV ......................................................... 200kHz RESOLUTIONBW ......................................................... lMHz INPUTATTEN ..........................................................
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-22. 3-dB BANDWIDTH ADJUSTMENTS (Cont'd) NOTE If the 100 kHz bandwidth is not within the specified limits, change the values of factory-selected resistors A11R19*, A11R43*, A13R19*, and A13R43*. If the bandwidth is too wide, increase the value of the resistors; if the bandwidth is too narrow, decrease the value of the resistors. The factory-selected resistors need not be of equal value, but each must be within one standard value of the others. 8.
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-22. 3-dB BANDWIDTH ADJUSTMENTS(Cont'd) Adjust A9R72 XTL to bring signal level to the fifth graticule line (three divisions from the top graticule line). Increase signal generator frequency until signal on CRT display peaks and then decreases to the fifth graticule line. Record counter frequency. Compare new frequency with frequency recorded in step 14. The difference between the two frequencies should be 2800 to 3200 Hz.
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-22. 3-dB BANDWIDTH ADJUSTMENTS (Cont'd) Increase signal generator frequency until signal on CRT display decreases to the fifth graticule line. Record the counter frequency. Compare new frequency with frequency originally noted in step 25. The difference between the two frequencies should be 450 Hz to 550 Hz.
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-23. RF GAlN ADJUSTMENT REFERENCE: A12 Schematic DESCRIPTION: The RF gain (sensitivity) of Step Gain Assembly A12 is adjusted by injecting a 21.4 MHz signal at XAlOPl. Third Converter Assembly A10 is removed and replaced with a special extender board for applying the 21.4 MHz signal from the signal generator. SIGNAL GENERATOR D I G I T A L VOLTMETER PWER METER D l SPLAY (BLACK LEAD EXTENDER BOARD WITH 5 1 . 1 RESISTER I N XAlOPI FIGURE 5-9.
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-23. RF GAIN ADJUSTMENT (Cont'd) NOTE To make special extender board, solder 51.1 ohm resistor from pin 18 to pin 22 of standard 24 pin extender board, HP Part No. 5060-0258. Leave resistor leads long for easy connection of clip leads. PROCEDURE: 1. Set spectrum analyzer controls as follows: FREQUENCYBANDGHz .................................................. .01-3 FREQ SPAN/DIV .......................................................... 1 MHz RESOLUTIONBW ..........
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-23. RF GAlN ADJUSTMENT (Cont'd) When reconnecting A1OW1 to A5J2, exercise caution; the connector should not be torqued more than 6 inch-pounds, othewise damage to A5J2 will result. NOTE Front panel VERTICAL GAlN and POSN control settings can affect the voltage measured at A15TP1. Vertical calibration should be checked after adjusting A12R5 for 700 mV (Refer to Section Ill).
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-24. STEP GAlN ADJUSTMENTS REFERENCE: A12 Schematic DESCRIPTION: REF LEVEL FINE, 0 dB, and - 12 dB adjustments are properly set and step gains of 10 dB, 20 dB, and 40 dB are adjusted. SIGNAL GENERATOR D I G I T A L VOLTMETER . ATTENUATOR RF OUTPUT lNPUT D l SPLAY STEP ATTENUATOR FIGURE 5-10. STEP GAlN ADJUSTMENTSTEST SETUP EQUIPMENT: Signal Generator ......................................................... HP 8640B Step Attenuator (1 dB/Step) ..............
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-24. STEP GAIN ADJUSTMENTS (Cont'd) PROCEDURE: Set spectrum analyzer controls as follows: FREQSPAN/DIV .......................................................... lMHz RESOLUTIONBW .........................................................lMHz INPUTATTEN ............................................................. 10dB REFLEVELdBm ............................................................... 0 Amplitudescale .........................................................
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-24. STEP GAIN ADJUSTMENTS(Cont'd) NOTE Some video filtering might help reduce noise. Set VIDEO FILTER control so noise is reduced, but the signal amplitude remains unchanged. 16. Adjust A12R29 40 D adjustment for signal level one division from top graticule line. 17. Check REF LEVEL dBm control from 0 to - 50 as shown in Table 5-11. TABLE 5-11.
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-25. FIRST CONVERTER ADJUSTMENTS REFERENCE: A3, A4, AS, A6, and A7 Schematics DESCRIPTION: The First LO (A6 YTO) is adjusted by monitoring the YTO output at the RF input connector (LO emission) and the tuning voltage (TUNE) output of the A7 Frequency Control board, and adjusting the YTO low-end frequency for 3 GHz at OV tuning voltage and 6 GHz at - 10V tuning voltage.
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-25. FIRST CONVERTER ADJUSTMENTS (Cont'd) First LO Adjustments 2. Connect DVM to A7TP6 TUNE. 3. Set spectrum analyzer controls as follows: INPUT ATTEN .............................................................. 0 dB FREQ SPAN/DIV ............................................................... 0 ALTIF ..................................................................... OFF 4. Connect frequency counter to spectrum analyzer RF Input. 5.
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-25. FIRST CONVERTER ADJUSTMENTS (Cont'd) Alternate IF First LO Shift Check 15. Press front-panel ALT IF pushbutton IN to activate alternate IE 16. Verify YTO frequency shift according to Table 5-12. ABLE 5-12. FIRST LO SHIFT CHECK FREQUENCY BAND GHz ALT IF OFF ON ON ON ON ON ON FREQUENCY COUNTER INDICATION Reference (6.000 GHz) Reference - 15 MHz 5800 kHz Reference + 15 MHz 5800 kHz Reference -7.5 MHz 5400 kHz Reference +7.
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-25. FIRST CONVERTER ADJUSTMENTS (Cont'd) Adjust front-panel TUNING FINE control to place a comb tooth on the first vertical graticule line of the CRT display. Adjust A7R92 FM to place a comb tooth on the ninth vertical graticule line of the CRT display. Switch to 10 kHz RES BW and adjust A7R83 DC for even spacing of the comb teeth on the first two graticule lines. Readjust TUNING FINE control to place a comb tooth on the first vertical graticule line.
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-25. FIRST CONVERTER ADJUSTMENTS (Cont'd) Set FREQ SPAN/DIV to 1 MHz. Note position of comb tooth. Adjust A7R81 (MO) to place comb tooth midway between position noted in step 38 and center graticule line. Set FREQ SPAN/DIV to 2 MHz. Adjust TUNING to place comb tooth in center graticule line. Set FREQ SPAN/DIV to 1 MHz. Note displacement of comb tooth from center graticule line. Repeat steps 36 through 42 until displacement of comb tooth is less than 0.
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-26. SECOND CONVERTER ADJUSTMENTS REFERENCE: A3, A4, AS, A6, and A8 Schematics DESCRIPTION: First, the Second LO is adjusted for proper frequency using a frequency counter. Next, the signal identifier (SIG ID) and alternate IF (ALT IF) signals are adjusted so that the displayed signal appears in the same location in both regular and alternate IF and the signal identifier is always 1 MHz away from this signal in either regular or alternate IF.
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-26. SECOND CONVERTER ADJUSTMENTS (Cont'd) PROCEDURE: Second LO Preliminary Adjustment Allow one-half hour warm-up time of equipment with analyzer connected to mainframe with extender cable. Connect frequency counter input to A5J3 2nd LO output using the test cable and two SMB adapters. Select Band 1 (.01-3) and Alternate IF on spectrum analyzer front-panel by depressing these pushbuttons.
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-26. SECOND CONVERTER ADJUSTMENTS(Cont'd) n r n ALT IF on and verify that the two signals do not appear to move. Change spectrum analyzer FREQ SPAN/DIV to 500 kHz. Repeat steps 7 through 14 if necessary to align both signal identifier signals and both alternate IF signals and spaced 1 MHz (2 divisions) apart on the CRT display. Depress front-panel ALT IF pushbutton. Turn SIG IDENT off. Note Second LO frequency on frequency counter.
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-26. SECOND CONVERTER ADJUSTMENTS(Cont'd) The requirements for the converter response are illustrated in Figure 5-13a and are as follows: Bandpass should be at least 17 MHz, 1 dB down. Amplitude of response at 3.75 divisions to the left and 3.75 divisions to the right of center screen should be as near the same as possible. These are the positions of the IF signals for regular and alternate IE This is illustrated in composite photo Figure 5-13b.
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-26. SECOND CONVERTER ADJUSTMENTS(Cont'd) THESE POINTS SHOULD BE A T SAME AMPLITUDE WITH BANDPASS >17 MHz WIDE 1 dB DOWN AS SHOWN THESE POINTS SHOULD BE A T SAME AMPLITUDE LEVEL k0.4 dB 7 r 1 +3.75 D I V -3.75 DIV a. TYPICAL BANDPASS RESPONSE C. ROLL-OFF A T HIGH-END OF RESPONSE ALTERNATE IF REGULAR IF b. COMPOSITE PHOTO SHOWING LOCATION OF I F SIGNALS d. ROLL-OFF A T LOW-END OF RESPONSE AF1 AND AF2 MUST BE 21 MHz BUT S4 MHz AF1 MUST EQUAL A F 2 20.
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-27. THIRD CONVERTER ADJUSTMENTS REFERENCE: A10 Schematic DESCRIPTION: First, the Third LO is adjusted for proper frequency using a frequency counter. Next, the second IF bandpass filter is aligned by injecting a frequency modulated 321.4 MHz signal at the necessary level and monitoring the 21.4 MHz output signal with another spectrum analyzer.
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-27. THIRD CONVERTER ADJUSTMENTS (Cont'd) PROCEDURE: 1. Allow one-'lalf hour warmup time of equipment with analyzer connected to mainframe with extender cable. Third LO Adjustment 2. Connect frequency counter to AlOJl 300 MHz output using the BNC to SMB test cable. 3. Adjust AlOL12 LO ADJ for frequency counter indication of 300.00 MHz +0.1 MHz. Second IF Bandpass Filter Alignment 4. Disconnect blue cable AlOWl at second converter output connector A5J2. 5.
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-27. THIRD CONVERTER ADJUSTMENTS (Cont'd) Adjust function generator amplitude and frequency for at least 10 MHz deviation (k5 MHz) and an easyto-view display on the 8569B spectrum analyzer. Refer to Figure 5-15. Increasing the frequency of the function generator will increase the swept frequency range of the sweep oscillator.
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-28. FREQUENCY RESPONSE ADJUSTMENTS REFERENCE: A3, A4, AS, A6, and A12 Schematics NOTE Perform CAL OUTPUT and REF LEVEL CAL adjustments (5-29) before proceeding with frequency response adjustments. DESCRIPTION: Frequency Response (flatness) is adjusted in six parts corresponding to the six harmonic bands of the analyzer. In each band, the analyzer is swept-tuned with a tracking signal source comprising a sweep oscillator and synchronizer.
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-28. FREQUENCY RESPONSE ADJUSTMENTS (Cont'd) FROM AUX ANALYZER D { S T P +5v >-h +, + 4 ' -IOV + 20v J2 IOK TO 8 6 2 0 C PROGRAMMING I) + 20V CRI R7 5K REFERENCE DESIGNATOR CRl J1 52 R1 R2 R3 R4 R5 R6 R7 R8 u1 HP P A R T NUMBER I DESCRIPTION DIODE-SWITCHING 30V 50 MA 2NS DO-35 CONNECTOR-RF BNC FEMALE 50-OHM CONNECTOR-MICRORIBBON 50-PIN MALE RESISTOR 9.09K 1% .125W RESISTOR-VAR CONTROL 1 OK 20% LIN RESISTOR 14.7K 1% .125W RESISTOR 10K 1% .
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-28. FREQUENCY RESPONSE ADJUSTMENTS (Cont'd) EQUIPMENT: Sweep Oscillator ......................................................... HP 8620C RF Plug-In (.01- 2.4 GHz) .............................................. H P 8622A/B RF Plug-In (2 - 22 GHz) ............................................. H P 86290B-H08 Synchronizer ........................................................ H P 8709A-H10 Power Meter ...........................................................
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-28. 5. FREQUENCY RESPONSE ADJUSTMENTS (Cont'd) Set spectrum analyzer controls as follows: REF LEVEL FINE .......................................................... 0 dBm REFLEVELdBm ............................................................ - 20 INPUTATTEN ............................................................. 10dB Amplitude Scale ........................................................ 10 dB/DIV FREQ SPAN/DIV ...............................................
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-28. FREQUENCY RESPONSE ADJUSTMENTS (Cont'd) 11. Adjust Tuning Voltage Circuit GAIN control to expand the phase-locked display over 8 1/2 divisions on CRT (.01- 2.4 GHz). Refer to Figure 5-18b. It may be necessary to readjust OFFSET slightly to achieve phase-lock over entire range. 12. Optimum phase-lock is indicated by a smooth trace over full swept frequency range on CRT and minimum needle movement on synchronizer phase error meter. 13.
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-28. 26. FREQUENCY RESPONSE ADJUSTMENTS (Cont'd) Adjust Tuning Voltage Circuit GAIN and OFFSET controls to phase-lock swept signal from 2 to 3 GHz. 27. Adjust RF plug-in POWER LEVEL control to place trace at approximately - 27 dBm on CRT. 28. Change spectrum analyzer Amplitude Scale to 1 dB/DI\! 29. Adjust RF plug-in POWER LEVEL control to place 2.1 GHz position of CRT trace to same level as that noted in step 18. 30. Note flatness of trace from 2 to 3 GHz.
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-28. FREQUENCY RESPONSE ADJUSTMENTS (Cont'd) ROLL-OFF GHz AT ~ 2 . 5 BAND SWITCH POlNT A T 6.2 GHz b. BAND 2(6-9 GHz) a. BAND 1 L01-3 GHz) BAND SWITCH POlNT A T 12.4 GHz B A N D SWITCH POlNT A T 6.2 GHz c. B A N D 3(3-9 GHz) BAND SWITCH POINT A T 6.2 G Hz e. B A N D 5(6-15 GHzl BAND SWITCH POINT A T 12.4 GHz d. BAND 4 (9-15 GHz) BAND SWITCH POlNT A T 12.4 GHz f. BAND 6 (12.1-21 GHz) FIGURE 5-19.
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-28. FREQUENCY RESPONSE ADJUSTMENTS(Cont'd) 3 to 9 GHz Adjustment 39. Change synchronizer POLARITY to - . 40. Change spectrum analyzer Amplitude Scale to 10 dB/DIV and FREQUENCY BAND GHz to 3 - 9. 41. Adjust sweep oscillator for swept output from 3 to 9 GHz. 42. Adjust Tuning Voltage Circuit GAIN and OFFSET controls to phase-lock swept signal from 3 to 9 GHz. Refer to Figure 5-19c. 43. Change spectrum analyzer Amplitude Scale to 1 dB/DIV. 44.
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-28. FREQUENCY RESPONSE ADJUSTMENTS (Cont'd) 57. Change spectrum analyzer Amplitude Scale to 1 dB/DIV. 58. Adjust A12R71 V3 - (bias), A12R61 5A (offset), A12R53 5B (tilt), and A12R54 5C (breakpoint) for best overall flatness of trace from 6 to 15 GHz with trace approximately centered about the sixth horizontal graticule line on the CRT. 59. Total deviation of trace from 6 to 15 GHz should not exceed 4.2 dB. 12.
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-29. CAL OUTPUT AND REF LEVEL CAL ADJUSTMENTS NOTE These adjustments should be followed by frequency response adjustments, since adiustment of A12R57 1A (offset) will shift the freauencv resDonse of Band 1 (.bl - 3 GHz). REFERENCE: A10 and A12 Schematics DESCRIPTION: The 35 MHz CAL OUTPUT signal is adjusted for proper amplitude and frequency using a power meter and frequency counter.
MODEL 8559A ADJUSTMENTS ADJUSTMENTS 5-29. CAL OUTPUT AND REF LEVEL CAL ADJUSTMENTS (Cont'd) PROCEDURE: CAL OUTPUT Adjustment 1. Allow one-half hour warmup time of equipment with spectrum analyzer connected to mainframe with extender cable. 2. Connect power meter/power sensor to front-panel CAL OUTPUT connector as shown in Figure 5-20. 3. Place spectrum analyzer on its right side. Adjust A10R13 CAL AMPL for power meter indication of - 10.0 dBm k 0.1 dB. A10R13 is accessed through motherboard. 4.
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-29. CAL OUTPUT AND REF LEVEL CAL ADJUSTMENTS (Cont'd) 15. Signal peak should now be approximately at top graticule line (Reference Level) on CRT. 16. Switch between 10 dB/DIV and LIN while adjusting A12R57 1A (offset) to place signal peak at same level in both 10 dB/DIV and LIN. 17. Level at which signal peaks are coincident should be at top graticule line (Reference Level). If not, adjust front-panel VERTICAL GAIN to place signal peak at Reference Level line.
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-30. FREQUENCY DISPLAY ADJUSTMENTS REFERENCE: A1 and A8 Schematics DESCRIPTION: The Digital Panel Meter (DPM) OFFSET and GAIN controls are adjusted for proper FREQUENCY display indication at corresponding tuning voltage (DPMA) levels. D I Q I T A L VOLTMETER INPUT V D l SPLAY FIGURE 5-21. FREQUENCY DISPLAY ADJUSTMENTS TEST SETUP EQUIPMENT: Digital Voltmeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ADJUSTMENTS MODEL 8559A ADJUSTMENTS 5-30. FREQUENCY DISPLAY ADJUSTMENTS(Cont'd) PROCEDURE: Allow one-half hour warmup time of equipment with analyzer connected to mainframe with extender cable. Jumper A8TP5 DPM to ground. Set front-panel FREQUENCY BAND GHz to Band 1 (.01- 3). Connect DVM to AlA2TPl DPMA. AlA2TPl is located below the board and is accessible through cutout in left side gusset. Adjust A8R61 DPM ZERO for DVM indication of 0.000 Vdc.
MODEL 8559A REPLACEABLE PARTS SECTION VI REPLACEABLE PARTS 6-1. INTRODUCTION The replaceable parts list breakdown for each major assembly is located in Section VIII, following the circuit description for the assembly. This section contains information for ordering the replacement parts not listed in Section VIII. Table 6-1 includes a list of reference designations and a list of abbreviations used in the parts list.
REPLACEABLE PARTS MODEL 8559A TABLE 6.1. REFERENCE DESIGNATIONS AND ABBREVIATIONS (1OF 3) REFERENCE DESIGNATIONS . . . . . . . . . . . . . . . . . . . . . . . . Assembly . . . . . . . . . . . . . . Attenuator, Isolator, Limiter, Termination . . . . . . . . . . . . . . . . . . . . . . Fan,Motor . . . . . . . . . . . . . . . . . . . . . . . . . Battery . . . . . . . . . . . . . . . . . . . . . . . Capacitor ........................ Coupler . . . . . . . . . . .
MODEL 8559A REPLACEABLEPARTS TABLE 6-1. REFERENCE DESIGNATIONSANDABBREVIATIONS (2 OF 3) J-FET . . . . . . . . . . . Junction Field Effect Transistor JFET . . . . . . . . . . . . Junction Field Effect Transistor K . . . . . . . . . Kelvin, Key, Kilo, Potassium KNRLD . . . . . . . . . . . . . . . . . . . . Knurled KVDC . . . . . . . . Kilovolts Direct Current LED . . . . . . . . . . . . Light Emitting Diode L C . . . . . . . . . . . . . . . . . . . . Length, Long LIN . . . . . . . . . . . . . . . .
REPLACEABLE PARTS MODEL 8559A TABLE 6-1. REFERENCE DESIGNATIONS AND ABBREVIATIONS (3 OF 3) MULTIPLIERS Abbreviation T G M k da d c Prefix Multiple Abbreviation Prefix Multiple tera 1012 lo9 lo6 lo3 10 lo-' 1o - ~ m milli micro nano pic0 femto atto 1o - ~ 1o - ~ 1o - ~ 10-l2 1 0-l5 gigs mega kilo deka deci centi C1 n P f a 10-l8 TABLEG-2. MANUFACTURERSCODE LIST Mfr. No.
MODEL 8559A REPLACEABLE PARTS TABLE 6-3.
REPLACEABLE PARTS MODEL 8559A TABLE 6-3. REPLACEABLE PARTS HP Part Number Description ACCESSORIES S U P P L I E D S I D E STOP K I T ADAPTER, T Y P E N M A L E T O BNC FEMALE C R T -O V E R L A Y , H P 1 8 0 SERIES DISPLAYS C R T -O V E R L A Y . H P 1 8 1 SERIES DISPLAYS C R T -O V E R L A Y . H P 1 8 2 SERIES DISPLAYS E C O N O M Y S.A. O P E R A T I O N B O O K L E T Mfr. Code Mfr.
MODEL 8559A REPLACEABLE PARTS TABLE 6-3. REPLACEABLE PARTS Reference Designator H P Part Number Description MISCELLANEOUS CHASSIS PARTS ELECTRICAL CAP (MOUNTED O N REAR P A N E L ) CAP ( M O U N T E D O N REAR P A N E L ) C A B L E ASSEMBLY, R F INPUT T O ATTENUATO R C A B L E ASSEMBLY, A T T E N T O F I R MIXER C A B L E ASSEMBLY, Y T O T O FIRST MIXER C A B L E ASSEMBLY, C A L OUTPUT C A B L E ASSEMBLY, V E R T O U T MECHANICAL L A B E L .
REPLACEABLE PARTS MODEL 8559A HP Part Number Description PANEL, F R O N T Mfr. Code Mfr. Part Number 0 8 5 5 9 -0 0 0 3 0 GUSSET, L E F T S I D E 0 8 5 5 9 -0 0 0 3 8 GUSSET, R I G H T S I D E 08559-00037 PANEL, R E A R 0 8 5 5 9 -0 0 0 0 3 RAIL. G U I D E TOP EXTRUSION, C I R C U I T ENCLOSURE, TAPPED EXTRUSION. E N D P L A T E ENCLOSURE EXTRUSION, C I R C U I T ENCLOSURE, TAPPED EXTRUSION, CIRCUIT ENCLOSURE WINDOW, FREQ.
MANUAL BACKDATING CHANGES MODEL 8559A SECTION VII MANUAL BACKDATING CHANGES 7-1. INTRODUCTION 7-2. This section contains information for adapting this manual to earlier 8559A Spectrum Analyzers. If the serial number prefix of your spectrum analyzer appears on the title page of this manual, the contents of the manual are directly applicable to your instrument.
Page 1-3: Table 1-1. HP 85596 Specifications ( 1 of 4) 2236A & Below Change " Residual FMw s p e c i f i c a t i o n t o read a s follows: l e s s than 1 kHz p-p f o r a time i n t e r v a l l e s s t h a n o r e q u a l t o .O1 s e c , 100/120 l i n e v o l t a g e s ; l e s s than 2 kHz p-p, 220/240 l i n e voltages. Delete t h e following under "Maximum Input ( w i t h o u t damage) Levelstt: Peak Pulse Power +50 dBm (100W, 10 microsecond p u l s e width, 0.
/- Pages 4-10 and 4-11: Paragraph 4-13. Residual RI 2320A & Below Change SPECIFICATION t o read a s follows: Less than 1 kHz peak-to-peak f o r a time i n t e r v a l 0.1 second; 100/120 l i n e v o l t a g e s ; l e s s t h a n 2 kHz peak-to-peak i n a 180s e r i e s d i s p l a y mainframe with 220/240 l i n e v o l t a g e . Replace t h e n o t e i n s t e p 6 w i t h t h e following: MOTE A 1 kHz s h i f t i n Frequency produces a 0.7 division s h i f t i n .
Page 4-63: Table 4-18. Performance Test Record (2 of 4) 2320A & Below Under Para. No. 4-13. Residual FM, change the maximum Peak-toPeak Variation of Trace in test 6 to 0.7 div ( 1 kHdO.1 sec).
- Pages 5-11 through 5-13: Paragraph 5-17. Power Supply Checks and Adjustments 2236A & Below Replace Paragraph 5-17 w i t h new Paragraph 5-17 (SERIAL PREFIX 2236A) included i n t h i s Manual Backdating supplement.
ADJUSTMENTS /-- 5-17. POWER SUPPLY CHECKS AND ADJUSTMENTS (SERIAL PREFIX 2236A) REFERENCE: A7, A8, A9 Schematics DESCRIPTION: The + 14.5V and - 10V supplies on Frequency Control Assembly A7 are adjusted. The - 12.OV supply on A7 is checked for proper dc output with less than +50 mV variation when tuning the HP 8559A from 0 to 3 GHz. The + 10.OV supply on Sweep Generator/Bandwidth Control Assembly A9 is adjusted and the VO (Varactor Offset) voltage on Marker Assembly A8 is adjusted. The + 10.
ADJUSTMENTS 5-17. 6. POWER SUPPLY CHECKS AND ADJUSTMENTS(SERIAL PREFIX 2236A) (Cont'd) Remove extender board and reinstall Frequency Control Assembly A7. NOTE The two following voltage adjustments, + 10V and VO (Varactor Offset), must be adjusted while analyzer is still cold (during first five minutes after turn-on). If instrument has been operating longer than five minutes, turn off mainframe and remove assemblies A8 and A9. Let assemblies A8 and A9 cool on bench for 15 minutes.
Pages 5-17 through 5-23: Paragraph 5-19, Log Amplifier and Linear Adjustments 2208A & Below Replace Paragraph 5-19 with new Paragraph 5-19 (SERIAL PREFIX 2208A) included i n t h i s Manual Backdating supplement.
ADJUSTMENTS 5.19. LOG AMPLIFIER LOG AND LINEAR ADJUSTMENT (SERIAL PREFIX 2208A) REFERENCE: A14 and A15 Schematics DESCRIPTION: 10 dB/DIV and LIN are adjusted for correct steps and full-screen display translations. DISPLAY DIGITAL VOLTMETER SIGNAL GENERATOR F UTPUT ATTENUATOR FIGURE 53. LOG AMPLIFIER LOG AND LINEAR ADJUSTMENTTESTSETUP EQUIPMENT: Signal Generator ......................................................... HP 8640B Digital Voltmeter ......................................................
ADJUSTMENTS 5-19. LOG AMPLIFIER LOG AND LINEAR ADJUSTMENT (SERIAL PREFIX 22O8A) (Cont'd) Connect equipment as shown in Figure 5-3. Set signal generator frequency to 321.4 MHz and output level to - 40 dBm. Remove AlOW 1from A5J2 2nd CONV OUT. Connect signal generator output through step attenuator and adapters to AlOWl. Set the TEST-NORM switch A12S1 to the TEST position. T h e signal generator frequency for maximum signal amplitude on oscilloscope display with step attenuator set at 0 dB.
ADJUSTMENTS 5-19. LOG AMPLIFIER LOG AND LINEAR ADJUSTMENT (SERIAL PREFIX 22O8A) (Cont'd) * 12. Set step attenuator to 0 dB. Digital voltmeter should indicate 800 mV, plus offset (algebraic sum) 1 mV. If DVM reading is not within limits, adjust A14R2 LOG LIN adjustment for a digital voltmeter reading of 800 mV, plus offset minus 50 percent of overshoot.
ADJUSTMENTS 519. LOG AMPLIFIER LOG AND LINEAR ADJUSTMENT(SERIAL PREFIX 22O8A) (Cont'd) Set output level of signal generator for a digital voltmeter reading of 800 mV plus offset (algebraic sum) f lmY Set Amplitude Scale to 10 dB/DIV and adjust A14R2 LOG LIN adjustment for a digital voltmeter reading of 800 mV plus offset. Repeat step 14 to recheck the log fidelity. Set the REF LEVEL dBm control to - 50. Set Amplitude Scale to 1 dB/DIV.
Pages 5- 26 through 5-32: Paragraph 5-21. Bandwidth F i l t e r Adjustments 1909A & Below Replace Paragraph 5-21 w i t h new Paragraph 5-21 (SERIAL PREFIX 1909A) included i n t h i s Manual Backdating supplement.
ADJUSTMENTS 521. BANDWIDTH FILTER ADJUSTMENTS (SERIAL PREFIX 1909A) REFERENCE: A9, A 11, and A13 Schematics DESCRIPTION: The crystal and LC bandwidth filter circuits are adjusted for symmetry, center, and peak. ThreedB bandwidths are adjusted in Sweep Generator/Bandwidth Control Assembly A9 (paragraph 5-22). SPECTRUM ANALYZER DISPLAY 0 0 0 00.0 INPUT OUTPUT ADAPTER 6" BNC CABLE EXTENDER CABLE ASSEMBLY FIGURE56.
ADJUSTMENTS 5-21. BANDWIDTH FILTER ADJUSTMENTS(SERIAL PREFIX 1909A)(Cont'd) PROCEDURE: NOTE Allow 30 minutes warmup time before performing adjustments. 1. Set spectrum analyzer controls as follows: FREQUENCYBANDGHz .................................................. .01-3 TUNING. ................................................................ 35 MHz FREQSPAN/DIV .......................................................... 10kHz RESOLUTION BW .........................................................
ADJUSTMENTS 5-21. BANDWIDTH FILTER ADJUSTMENTS (SERIAL PREFIX 1909A)(Cont'd) 11. Set FREQ SPAN/DIV to 20 kHz, RESOLUTION BW to 30 kHz,and SWEEP TIME/DIV to 10 mSEC. NOTE A non-metallic tuning tool is required for adjustments on Bandwidth Filter Assemblies A11 and A13. 12. Connect crystal shorts (through cover access holes) across A13TPWTP2, A1 lTPl/TP2, and A1 1TP4/ TP5. NOTE Keep crystal spike centered during adjustments. The SYM and CTR adjustments for each crystal are interacting. 13.
ADJUSTMENTS 5-21. BANDWIDTH FILTER ADJUSTMENTS(SERIAL PREFIX 1909A)(Cont'd) 16. Adjust A13C15 SYM and A13C25 CTR for a centered and symmetrical bandpass. Adjust A13C25 CTR for minimum signal amplitude, 17. Remove crystal short from A1 lTP4/TPS.. 18. Adjust A11C38 SYM and AllC54 CTR for a centered and symmetrical bandpass. Adjust AllC54 for minimum signal amplitude. 19. Remove crystal short from A1 1TP1/TP2. 20. Adjust AllC15 SYM and AllC25 CTR for a centered and symmetrical bandpass.
ADJUSTMENTS 5-21. BANDWIDTH FILTER ADJUSTMENTS(SERIAL PREFIX 1909A)(Cont'd) 23. Carefully center signal on CRT in 30 kHz RESOLUTION BW; then switch RESOLUTION BW to 100 kHz. Note where signal intersects the center vertical graticule line. 24. Adjust A13C45 LC CTR for maximum signal amplitude where the signal intersects the center vertical graticule line. 25. Switch RESOLUTION BW to 30 kHz and center signal; then switch to 100 kHz. Note where signal intersects the center vertical graticule line. 26.
ADJUSTMENTS 5-21. BANDWIDTH FILTER ADJUSTMENTS (SERIAL PREFIX 1909A)(Cont'd) 37. Set FREQ SPAN/DIV to 10 kHz and RESOLUTION BW to 1 kHz with arrows aligned (OPTIMUM). Push in to couple the two controls. 38. Adjust REF LEVEL FINE for a signal amplitude of 7 divisions. 39. With controls coupled, step RESOLUTION BW from 1 kHz to 3 MHz. Variation in signal amplitude should be less than 0.4 dB. * 40. If variation in signal amplitude is not within limits, repeat steps 32 through 39.
Pages 5-33 through 5-37: Paragraph 5-22. 3 dB Bandwidth Adjustslent 1909A & Below Replace Paragraph 5-22 with new Paragraph 5-22 (SERIAL PREFIX 1909A) included i n t h i s Manual Backdating supplement.
ADJUSTMENTS /-- 5-22. 3 dB BANDWIDTH ADJUSTMENTS(SERIAL PREFIX 1909A) REFERENCE: A9 Schematic DESCRIPTION: The 3-dB bandwidths for the 3 MHz, 1 MHz and 300 kHz RESOLUTION BW settings are adjusted using the CAL OUTPUT as the signal source. The 3-dB bandwidths for the 10 kHz, 3 kHz, and 1 kHz RESOLUTION BW settings are adjusted by injecting a stable 321.4 MHz signal into the third converter of the spectrum analyzer.
ADJUSTMENTS 5-22. 3 dB BANDWIDTH ADJUSTMENTS (SERIAL PREFIX l9O9A) (Cont'd) 3. Set signal level of 7.1 divisions on display with REF LEVEL FINE control. (Signal should be 0.9 division from top graticule line.) 4. Set RESOLUTION BW to 1 MHz and FREQ SPAN/DIV to 200 kHz. Adjust A9R85 LC to set bandwidth of 5 divisions at the fifth graticule line. 5. Set RESOLUTION BW to 3 MHz and FREQ SPAN/DIV to 500 kHz. The bandwidth at the fifth graticule line should be between 5.4 and 6.6 divisions.
ADJUSTMENTS /- 5-22. 3 dB BANDWIDTH ADJUSTMENTS (SERIAL PREFIX 1909A)(Cont'd) 10. Remove AlOWl from A5J2 2nd CONV OUT Connect step attenuator through adapter to A1OW1. 11. Set HP 8559A RESOLUTION BW to 1 MHz. Adjust the output level of signal generator to place the signal near center graticule line. Tune signal generator frequency to peak signal on oscillo~copedisplay (near 321.4 MHz). 12. Set RESOLUTION BW to 3 kHz. Tune signal generator to peak signal on oscilloscope display.
ADJUSTMENTS * 5-22. 3 dB BANDWIDTH ADJUSTMENTS (SERIAL PREFIX lgO9A)(Cont'd) Compare new frequency with frequency recorded in step 20. The difference between the two frequencies should be 9.000 kHz to 11.000 kHz. NOTE A9R72 XTL may be further adjusted to bring the 10 kHz and 1 kHz bandwidths within limits; however, the final measurement of the 3 kHz bandwidth must be between 2700 Hz and 3300 Hz.
Pages 5-44 through 5-48: Paragraph 5-25. First Converter Ad justrents 2236A & Below Replace Paragraph 5-25 with new Paragraph 5-25 (SERIAL PREFIX 2236A) included i n t h i s Manual Backdating supplement. 2004A & Below Delete s t e p s 28 through 37.
ADJUSTMENTS 5-25. FIRST CONVERTER ADJUSTMENTS (SERIAL PREFIX 2236A) REFERENCE: A3, A4, AS, A6, and A7 Schematics DESCRIPTION: The First LO (A6 YTO) is adjusted by monitoring the YTO output at the RF input connector (LO feedthrough) and the tuning voltage(TUNE)output of the A7 Frequency Control board and adjusting the YTO low-end frequency for 3 GHz at OV tuning voltage and 6 GHz at - 10V tuning voltage.
ADJUSTMENTS 5-25. FIRST CONVERTER ADJUSTMENTS(SERIAL PREFIX 2236A)(Cont'd) Connect frequency counter to analyzer RF Input. Jumper A16TP1 DIODE BIAS to Ground. A16TP1 is located on the Motherboard through a hole in the analyzer side frame. Adjust front-panel TUNING control for DVM indication of 0.000 Vdc (fully counterclockwise). Adjust A7R74 3 GHz for frequency counter indication of 3.000 GHz +1 MHz.
ADJUSTMENTS /'- 5-25. FIRST CONVERTER ADJUSTMENTS (SERIAL PREFIX 2236A)(Cont'd) FM Driver Adjustment 18. Disconnect frequency counter from analyzer RF Input and connect comb generator to RF Input, 19. Set comb generator for 1 MHz comb teeth. 20. Set analyzer controls as follows: FREQ SPAN/DIV .......................................................... 1 MHz RES BW .................................................................. 30 kHz TIME/DIV ...........................................................
ADJUSTMENTS , 5-25. FIRST CONVERTER ADJUSTMENTS(SERIAL PREFIX 2236A)(Cont'd) 32. Set FREQ SPAN/DIV to 1 MHz. Note position of comb tooth. 33. Adjust A7R99 MO to place comb tooth midway between position noted in step 32 and center graticule line. 34. Set FREQ SPAN/DIV to 2 MHz. 35. Adjust TUNING to place comb tooth on center graticule line. 36. Set FREQ SPAN/DIV to 1 MHz. Note displacement of comb tooth from center graticule line. 37.
/- Page 6-7: Table 6-3. Replaceable Parts 2236A & Below Change W3 t o HP Part Number 1250-1159, Check D i g i t 4, CABLE ASSEMBLY, YTO TO FIRST MIXER. 1951A.1945A Change W4 t o HP Part Number 08559-60001, Check D i g i t 3, CABLE ASSEMBLY, CAL OUTPUT.
Page 6-8: Figure 6-1, Mechanical Chassis Parts 2236A & Below Change item (21, GUSSET, LEFT, t o HP P a r t Number 08559-60032, Check Digit 4. Change item ( 3 ) , GUSSET, RIGHT, t o HP P a r t Number 08559-60031, Check Digit 3. 2208A & Below Change item ( I ) , PANEL, FRONT, t o HP P a r t Number 08559-00001, Check Digit 7. Change item ( 2 ) , GUSSET, LEFT, t o HP P a r t Number 08559-00005, Check Digit 1. Change item ( 3 ) , GUSSET, RIGHT, t o HP P a r t Number 08559-00004, Check Digit 0.
Pages 8-17 through 8-23/8-24: DIGITAL PANEL METER ASSEneLY A1 Table 8-1. D i g i t a l Panel Meter Assembly A1, Replaceable P a r t s 2218A & Below Replace Table 8-1 with new Table 8-1 (SERIAL PREFIX 2218A) included i n t h i s Manual Backdating supplement. 2208A & Below Change AIAI t o HP P a r t Number 08559-60032, Check Digit 0. Add AlAlMP1, HP P a r t Number 0380-1047, Check D i g i t 3, SPACER-RVTON -25-IN-LG .15-IN-ID.
DIGITALPANEL METER ASSEMBLY AI, REPLACEABLEPARTS(SERIAL PREFIX 2218A) - Reference Designation HP Part Number Mfr Code - Description Mfr Part Number FREQUENCY D I S P L A Y ASSEHRI Y PA480 DPH D I S P L A Y D I S P L A Y NUH SCG DICjPL AY NllH :KC DISPLAY- NUH -SFG D15Pl.AY-NllH-?FG DISPLAY-NUN -SFC SOCKET -1C SOCKrT -1C SOCKFT--1C SOCKFT- IC SOCKET I C I- CHAR 1 CHAR 1-CHAR 1 CHAR 1-CHAR 10-CONT 10-.CONT 1 0 CONT 10- CONT 1 0 CONT DIP DIP DIP DIP DIP 70480 ?8480 20480 ?0480 2C4RO . 3 11 .3 H .
A1A2 DPM DRIVER OFFSET AlAl DPM DISPLAY FIGURE 85.
/- Pages 8-25 through 8-49/8-50: FROtiI WITCH JBSEllBLY A2 Figure 8-10. Front Switch Assembly 62, Exploded View 2208A & Below Delete Figure 8-10. 2109A00441 & Below Add HP Part Number 08558-00021, Check D i g i t 0 , PLATE LEVEL, POT ( S 1 ) . Table 8-2. Front Switch Board Assembly A2A1, Replaceable Parts 2208A & Below Replace Table 8-2 with new Table 8-2 (SERIAL PREFIX 2208A) included i n t h i s Manual Backdating supplement.
TABLE 8-2. FRONT SWITCH BOARD ASSEMBLY A2, REPLACEABLEPARTS (2 OF 2) (SERIAL PREFIX 2218A) Reference Designation HP Part Number Mfr Code - Description 2R4:\0 :!I1400 ,'04110 ?I14110 :'84110 X~IXI 704::n 7114110 7R.III0 34no SPACFR ,5001. ,11411) ( 5 1 , 53, 54, S'J, SPACFR ROTOR ( S 5 ) SPR CC'R . 1 8 0 0 U ( $ 1 , !i3, 5 4 , G S , :ib) IsPR CPR .5400D ( R 1 ) SPR 1RS 1 . 1 0 0 L C ( 5 4 ) $6,) i'84610 28400 20480 ?O400 :'04RO 2H4l7O 28400 4 7 HIlilTI..
Pages 8-51 through 8-6W8-66: YIC-TUUED OSCILLATOR MEHBLY A6 Table 8-3. BF Section, Replaceable Parts 2240A & Below Add A5MP3, HP P a r t Number 08559-20041, Check D i g i t 7, COVER, 2ND L.O. Under Miscellaneous P a r t s : Change t h e q u a n t i t y of HP P a r t Number 2200-0119 from 7 t o 9. Delete HP P a r t Number 2200-0156. 2236A & Below Change A5 t o HP P a r t Number 08559-60005, Check D i g i t 7. Change A5MP2 t o HP P a r t Number 08559-20002, Check Digit 0, CAVITY BLOCK.
I A6 . 1, I - YIG-TUNED OSClLLATOR (FIRST LO: 5086-7301 YDRFROM A7PI-21 J2 YC FROM A7PI-21 YC+ FROM A7PI-20 YDR+ (+I5V) FROM A7PI-24 I +I4 5V FROM A7PI-I0 I I -IOV FROM A7PI-32 I YFMFROM A7Pl-15.37 YFM+ (GND) 3 >I 0 PI0 FIGURE 8-25.
Pages 8-67 through 8-81/8-82: FBEQOEWCY COIlTROL ASSEHBLY A7 Table 8-4. Frequency Control Assembly A7, Replaceable Parts 2236A & Below Replace Table 8-4 w i t h new Table 8-4 (SERIAL PREFIX 2236A) i n c l u d e d i n t h i s Manual Backdating supplement. 2208A & Below Make t h e f o l l o w i n g changes t o new Table 8-4 (SERIAL PREFIX 22368 : Change A7 t o HP P a r t Number 08559-60021, Check D i g i t 7.
Figure 8-29. Frequency Control Assembly A7, Schematic Diagram (1 of 2) (COG~'~) 2004A & Below Make t h e following changes i n f u n c t i o n block (A): Delete R99. Connect pin 7 of UlOB t o pin 10 of U1OC. Figure 8-29. Frequency Control Assembly A7, Schematic Diagrar (2 of 2) 2236A & Below Replace Figure 8-29 (2 o f 2 ) w i t h new F i g u r e 8-29 ( 2 o f 2 ) (SERIAL PREFIX 2236A) included i n t h i s Manual Backdating supplement.
1 TABLE 0-4. FREQUENCYCONTROL ASSEMBLY A7, REPLACEABLEPARTS(2 OF 3) (SERIAL PREFIX 2236A) - ~efeknce Designation - HP Part Number Description Mfr Code - RESISTOR RFSI9TOR RFSISTOR RESISTOR RESISTOR 3 . 1 6 K 1 % .1?5W r TC=O+ 100 1 3 3 1% 12U PW TC=OI-2 TRMR 2 0 5 % W W STDT AD3 1 TRN 1 9 . 6 K 1 % .125W F TC=O+-100 lOK 1 % ,125W F T C = O i - I 0 0 24546 211480 ?nwo 24546 24546 RESISTOR RCSISTnR RFSISlOR RFSISTOR RESISTOR 10K 1 % ,125W F TC--0+-100 1 7 . 6 K 1% .125W r TC=O+ 1 0 0 IOOK 1% .
TABLE 84. FREQUENCY CONTROL ASSEMBLY A7, REPLACEABLE PARTS (3OF 3) (SERIALPREFIX 2236A) Reference Designation HP Part Number Mfr Part Number Description CONNFCTOR -SGL CnNT P I N 1 . 1 4 HH- HSC 57 SO A7 HIT,l'I'LI ANEOIIP. PARTS 'TRFW MACH ? Sh . : ' 5 TN 1 C P A N SCRTW MACH 4 4 0 1'071 .375 I N - I T.
A7 FREQUENCYCONTROL FIGURE 828.
GND YTO % TUNE +14.5V d FIGURE 828.
YC 4 0 + 2h5K R30 14.7 ,, +lCl 220 +LC2 220 jLC.3 I PI-ISIOUTI FM FILTER PI-21 (OUT) - PI0 FIGURE 829.
J D F J B B C I J C A J H I J I J J J G J B C E B E E C J A
Table 8-5. Harker Assembly 88, Replaceable Parts 23098 & Below Change A 8 t o HP P a r t Number 08559-60022, Check D i g i t 8. Delete A8C2. Change A8R13 t o HP P a r t Number 0757-0438, Check Digit 3, RESISTOR 5 % ~1% .i25w F TC=O+-loo. Change A8R36 t o HP P a r t Number 0757-0466, Check D i g i t 7, RESISTOR 1lOK 1% ,125W F TC=O+-100. Add A8R82, HP P a r t Number 0757-0438, Check D i g i t 3, RESISTOR 5.11K 1% .125W F TC=O+-100.
Figure 8-33. Marker Assembly A8, Schematic Diagram (1 of 2) 2309A & Below Change A 8 t o HP P a r t Number 08559-60022. Replace f u n c t i o n block ( I ) o f F i g u r e 8-33 w i t h new P/O F i g u r e 833 (1 of 2 ) (SERIAL PREFIX 2309A) included i n t h i s Manual Backdating supplement. 21528 & Below Make t h e f o l l o w i n g changes t o new F i g u r e 8-33 (1 o f 2 ) (SERIAL PREFIX 23OgA): Change R33 t o 34.8K. Change R87 and R88 t o 34.8K. D e l e t e t h e +14.5V supply a t R108.
A8 MARKER Q R61 DPM ZERO ' FIGURE 6-32.
1 0+5V POWER SUPPLY PI0 FIGURE 8-33. MARKER ASSEMBLY A8, SCHEMATIC DIAGRAM (1OF 2) (SERIAL PREFIX 2309A) SIC I D 9 R40 SOOK U2B,C 3.10 OFF 4.11 , R39 IY PI0 FIGURE 8-33.
Pages 8-97 through 8-115/8-116: WEEP GEIlERATOR/BIWI[IYIDM C O m O L ASSEHBLY A9 Table 8-6. Sweep Generator/Bandwidth Control Assembly A9, Replaceable Parts 2236A & Below Change A9 t o HP P a r t Number 08559-60074, Check Digit 0. Change A9C24 t o HP Part Number 0160-2055, Check D i g i t 9, CAPACITOR-FXD .01UF +80-20% 100VDC CER. Change A9C26 t o HP Part Number 0160-0153, Check Digit 4, CAPACITOR-FXD 1000PF +-I01 200VDC POLYE.
Figure 8-40. S w e p Generator/Bandwidth Control Assembly A9, Schematic Diagrm (2 of 21 2236A & Below Change A9 t o HP P a r t Number 08559-60074. Change t h e following i n function block (A): C26 t o .001UF. R120* t o 3830. Change t h e following i n function block (0): R83 t o 111. Add a "1" next t o the ground symbol a t t h e source of 423, 425, 429, and a t t h e emitter of 448. 2203A & Below Change A9 t o HP P a r t Number 08559-60071. In function block ( C ) , d e l e t e RlO6.
- TABLE 86. SWEEP GENERATORIBANDWIDTHCONTROL ASSEMBLY A9, REPLACEABLE PARTS (1 OF 4) (SERIALPREFIX 2107A01633) Reference Desianation HP Part Mfr Code Description Number W E E P GENERATO!t/BANDWIDTH - CONTROL 28480 CAPACITOR-FXD CAPACITOR-FXD CAPACITOR-FXD CAPACITOR-FXD CAPACITOR-FXD 2.2UF+-10% ZOVDC TA lOOOPF + - l o % lKVDC CER I U F +- 5% SOVDC MET-POLYC 782PF + - I % 10OVDC MICA 2.
TABLE 8-6. SWEEPGENERATORIBANDWIDTH CONTROL ASSEMBLY A9, REPLACEABLEPARTS (4 OF 4) (SERIAL PREFIX 2107A01633) Reference Designation - HP Part Number Description Mfr Code ?4'196 ?%"Ah 10701 ?-1516 ?4"4L, 74546 2fl41i0 2454i, 15'101 ;1!400 197111 01 l ? l 01121 24546 74596 2 1546 1')?01 74546 078fi8 :111:'1 2454b 24546 CONNTCKIR-SCI. CON1 P I N 1 . 1 4 UM-HSC-O7 SR TfI4RO I C UP AMP L P T f l - 9 9 P K G IC OP AMP CP DllAL TO - 9 9 PKI: I C DP AMP bP 0 - T O 9 9 PKG 31.
A9 SWEEP GENERATOR/BANDWIDTH CONTROL FIGURE 839.
A9 SWEEP GENERATORIBANDWIDTH CONTROL FIGURE 839.
I RETRACE OUT BUFFER AMPLIFIER +I4 5V k R 39 10% PI- l (OUT1 PE @ PULSE SHAPER + 15v -PI- 2 I I N ) SYNC I TRIGGER SWITCH -2411N) I L SINGLE PI0 FIGURE 840.
/- THIRD CONVERIEB ASSEUBLY A10 Pages 8-117 through 8-127/8-128: Table 8-7. Third Converter Assembly A10, Replaceable Parts 2218A & Below Delete t h e following: Aioc57, A10C58, A10C59, A10R52, A10R53, and A10U2. Chacge A10R6 t o HP P a r t Number 0757-0280, Check D i g i t 3, RESISTOR 1K 1% .125W F TC=O+-100. Change A10R8 t o HP P a r t Number 0757-0420, Check D i g i t 3, RESISTOR 750 1% .125W F TC=O+-100. Change AIOR11 t o HP P a r t Number 0757-0405, Check D i g i t 4, RESISTOR 162 1% .
"4 THIRD CONVERTER 8 AlOWl 321.4 MHz IF IN Q C10 321.4 MHz BPF ADJUST Q ,R13 Cll CAL AMPL c 1 2 H CAL FREO J1 300 MHz LO OUT (TEST CONNECTOR) ?J LO ADJ FIGURE 8-43. THIRDCONVERTER ASSEMBLY A10, COMPONENTLOCATIONS(SERIALPREFIX Zl8.
Q POWER SUPPLIES PI- 24 5.11v PI-23 - 12 6VF FIGURE 844.
Pages 8-129 through 8-141/8-142: BANDWIDTH FILTER w0. 1 ASSEUBLY A11 Table 8-8: Bandwidth F i l t e r No. 1 Assembly All, Replaceable Parts 1909A & Below Change A1 1 t o HP P a r t Number 08559-60057, Check D i g i t 9 , BANDWIDTH FILTER NO. 1. Add A11C3, HP P a r t Number 0160-2236, Check D i g i t 8 , CAPACITOR-FXD 1PF +-.25PF 500VDC CER. Change A11C16*, A11C20*, A11C43*, and AllC64* t o HP P a r t Number 01 60-01 34, Check Digit 1, CAPACITOR-FXD 220PF +-5% 300VDC MICA.
@FIRST LC POLE L C DIP Q, c73 IS-54pF I' t V L5 22 R19 BIAS * NOTE 6 BpF + IOVF C I ~R 3 2 220pF 4 6 4 K R26 IOOK R4 IOK + IOVF LC (FEEDBACK) I PI0 FIGURE 856. BANDWIDTH FILTER NO.
Pages 8-143 through 8-155/8-156: STEP GAIIY ASSJ9lBLY A12 Table 8-10. Step Gain Assembly A12, Replaceable Parts 2 1 0 7 A & Below D e l e t e A 1 2 C 4 0 , A 1 2 C 4 1 , and A12C42. Figure 8-60. Step Gain Assembly A12, Schematic Diagram 2 1 0 7 A & Below I n f u n c t i o n b l o c k (El, d e l e t e C40. I n f u n c t i o n b l o c k (F), d e l e t e C41. I n f u n c t i o n b l o c k (GI, d e l e t e C42.
/- Pages 8-157 through 8-165/8-166: BAHIIWIlYlM FILTER 10. 2 ASSEMBLY A13 Table 8-11: Bandwidth F i l t e r No. 2 Assembly A13, Replaceable Parts 1909A & Below Change A13 t o HP P a r t Number 08559-60057, Check D i g i t 9 , BANDWIDTH FILTER NO. 2. Add A13C3, HP P a r t Number 0160-2236, Check D i g i t 8 , CAPACITOR-FXD 1PF +-.25PF 500VDC CER. Change A13C16*, A13C20*, A13C43*, and A13C64* t o HP P a r t Number 0160-0134, Check Digit 1, CAPACITOR-FXD 220PF +-5% 300VDC MICA.
@ FIRST LC POLE I FEEDBACK) PI0 FlGURE8-63. BANDWIDTH FILTER NO.
/ ' Pages 8-167 through 8-179/8-180: LOG MPLIFIER ASSEHBLY A14 Table 8-12. Log Amplifier Assembly A14, Replaceable Parts 2208A & Below Replace Table 8-12 w i t h new Table 8-12 (SERIAL PREFIX 2208A) included i n t h i s Manual Backdating supplement. Figure 8-68. Log Amplifier Assembly A14, Component Locations 2208A & Below Replace F i g u r e 8-68 with new F i g u r e 8-68 (SERIAL PREFIX 2208A) included i n t h i s Manual Backdating supplement. Figure 8-69.
TABLE 812. LOG AMPLIFIER ASSEMBLY A14, REPLACEABLE PARTS (1 OF 4) (SERIAL PREFIX 2208A) Reference Designation HP Part Number Mfr Code Description 28480 LOG A M P L I F I E R CAPACITOR- FXD CAPACITOR -FXD CAPACITOR- FXD CAPACITOR -FXD CAPACITOR- FXD CAPACITOR- FXD CAPACITOR- FXD CAPACITOR- FXD CAPACITOR- FXD CAPACITOR- FXD .OIUF .02UF .O?UF ,021JF .02Uf + 8 0 - 2 0 % lOOVDC CfR +- 20% lOOVDC CER +-20% IOOVDC CER +- 20% 1 OOVDC CER +- 20% lOOVDC CER ..
- TABLE 812. LOG AMPLIFIER ASSEMBLY A14, REPLACEABLEPARTS (3 OF 4) (SERIAL PREFlX22W) Reference Designation HP Part Number Description Mfr Code - S I TO-18 PD-360HU S I PD=300HU FT=lSOHHZ 9 1 PD-300W FT=EOOHHZ S I PD=SOOHU FT=200HHZ 2N2219A S I TO-5 PD40OhU 28480 28480 28480 28480 01295 RESISTOR-TRHR 2K 10% C SIDF-ADS 17-TRN RESISTOR-TRHR 20K 10% C SIDE-ADJ 17-TRN RESISTOR-TRHR 2K 10% C SIDE-ADJ 17-TRN RESISTOR 1OK 1% .125U F TC=O+-100 RESISTOR 3.16K 1% .
TABLE 812. LOG AMPLIFIER ASSEMBLY A14, REPLACEABLE PARTS (4 OF4) (SERIAL PREFIX 220814) I Reference Designation HP Part Number Description RESISTOR 3 1 6 1% ,125U F RESISTOR 6 . 1 9 1 1% ,125U NOT ASSIGNED RESISTOR 2 . 8 7 1 1% .125U RESI9TOR IOK 1% ,125U F Mfr Code - TC=O+--100 F TC-0+-100 24546 19701 F TC=O+-100 TC=Ot-100 24546 24546 RCSISTOR RESISTOR RESISTOR RESISTOR RESISTOR 13.3K 1% .125W F TC=O+-100 IK 1% .125U F TC=O+-100 10 1% .125U F TC=Oi-100 10 1% .125U F TC=O+-100 6.81K 1% .
A14 LOG AMPLIFIER @ R2 LOGILIN-7v ~ l / LOG GAIN -- FIGURE 8-68.
Pages 8-191 and 8-199/8-200: MOTHERBOARD ASSEMBLY A16 Table 8-1 4. Motherboard Assembly A16, Replaceable Parts 2236A & Below Change A16 t o HP P a r t Number 08559-60066, Check D i g i t 0. Change A16C3 and A16C21 t o HP P a r t Number 0160-2055, Check D i g i t 9, CAPACITOR-FXD O1UF +80-20% 100VDC CER. Change A16C22 t o HP P a r t Number 0180-2154, Check D i g i t 1, CAPACITOR-FXD 1900UF +75-10% 15VDC AL. D e l e t e Al6Ql.
A16 MOTHERBOARD R4 E X T HORIZ GAIN .. XAll r - 7 'J41 h - 4 'I-? I XAlOPl I 0 DIODE BIAS FIGURE 8-76.
SERVICE MODEL 8559A SECTION Vlll SERVICE 8-1. INTRODUCTION 8-2. This section provides instructions for troubleshooting and repairing the HP Model 855914 Spectrum Analyzer. It includes circuit descriptions, general servicing hints and information, arts identification iilustrations and lists, block diag;ams, component locations diagrams, and schematics. the listed instrument is not available, another instrument that meets the required minimum specifications may be substituted.
SERVICE MODEL 8559A 8-12. Printed Circuit Board Edge Connector Contact Cleaning MATERIALS: Lint-free cloth or equivalent (HP Part Number 93 10-0039, Check Digit 3). Solution of 80% electronics-grade isopropyl alcohol and 20% water. Static-free work station. Do not use erasers to clean the edge connectors They cause microscopic damage to the contact surface, removing the thin gold plating and exposing the nickel under-plating, which eventually corrodes.
SERVICE MODEL 8559A SYMBOLS USED IN SCHEMATICS AND BLOCK DIAGRAMS BASIC COMPONENT SYMBOLS Variable Resistor: Clockwise rotation of shaft moves wiper towards end of resistor marked CW.
SERVICE MODEL 8559A SYMBOLS USED IN SCHEMATICS AND BLOCK DIAGRAMS BASIC COMPONENT SYMBOLS Connection symbol indicating a Jack (except for P C board edge connectors) Connection symbol indicating a Plug (except for PC board edge connectors) Test Point: Terminal provided for test probe. Measurement Point: Used to indicate a convenient point for measurement. No terminal provided for test probe. Indicates wire or cable color code. Color code same as resistor color code.
MODEL 8559A SERVICE SYMBOLS USED IN SCHEMATIC AND BLOCK DIAGRAMS BASIC LOGIC SYMBOLS Distinctive-Shape Symbols Output is active when input is active. SCHMITT TRIGGER Output changes abruptly as a fixed DC level is crossed by the input signal. AND FUNCTION Output is active only when all inputs are active. OR FUNCTION Output is active when one or more inputs are active. EXCLUSIVE-OR FUNCTION Output is active when only one input is active.
SERVICE MODEL 8559A SYMBOLS USED I N SCHEMATIC AND BLOCK DIAGRAMS BASIC LOGIC SYMBOLS Indicator Symbols (positive logic assumed) R EDGE-TRIGGERED (dynamic) inputs are indicated by the presence of the dynamic input symbol. Input is active only on the positive-going transition. ACTIVE PERIOD 'L Input is active only on the negativegoing transition. ACTIVE PERIOD ACTIVE-HIGH inputs and outputs are indicated by the absence of the negation symbol, 0 .
MODEL 8559A SERVICE Nominal power levels, voltages, and waveforms shown on schematic diagrams were measured using the test setup shown below. Note that signal characteristics shown on schematic diagrams are provided as a troubleshooting aid only. They should not be used for making instrument adjustments. OSCILLOSCOPE SPECTRUM ANALYZER D I G I T A L VOLTMETER D l SPLAY MA l NFRAME L BLANK I NO 1, l NPUT EXTENDER CABLE EQUIPMENT: Oscilloscope (with 10:1 probe) . . . . . . . . . . . . . . . . . . . .
SERVICE MODEL 8559A PROCEDURE: Set H P 8559A Spectrum Analyzer controls as follows: TUNING ...................................................... .035 GHz FREQ SPAN/DIV ................................................. 1 MHz RESOLUTION BW ............................................... 300 kHz INPUT ATTEN ..................................................... 0 dB REFERENCE LEVEL ........................................... - 10 dBm REFERENCE LEVEL FINE .............................................
MODEL 8559A SERVICE THE HP 8559A SPECTRUM ANALYZER THEORY OF OPERATION General Information The HP 8559A is a wideband spectrum analyzer plug-in module for use with either the H P 180 series or H P 853A display mainframes. It tunes from 10 MHz to 21 GHz and displays frequency spans as wide as 9 GHz (in bands 5 and 6) and as narrow as 100 kHz (in band 1). A zero span feature enables the analyzer to operate as a tunable, fixed-frequency receiver.
MODEL 8559A SERVICE holes, in the aluminum block housing to filter the first IF. A fourth cavity is used as the resonant circuit for the second LO, which operates at one of two fixed frequencies. After mixing with the first IF, the second LO produces the second IF at 321.4 MHz. The need for operating the second LO at two separate frequencies becomes apparent when measuring a signal at or near the first IF frequency, 3 GHz.
MODEL 8559A SERVICE Regardless of which harmonic is used for mixing, image frequencies can create problems. Image frequencies occur when a signal not in the band being viewed mixes with the LO to produce a response. It is possible to be in the 1 - band and have a signal at 5 GHz produce a response at 2 GHz; the opposite can occur in the 1 + band. As can be seen, it is necessary to be able to differentiate these signals. In the H P 8559A, this is the function of the signal identifier. Signal Identifier.
MODEL 8559A TROUBLESHOOTING HINTS Begin troubleshooting by measuring the mainframe-supplied voltages as close to the H P 8559A as possible. The Vertical Driver/Blanking Assembly A15 offers three test points (A15TP6, A15TP7, A15TP8) to make the measurements. The + l00V supply is available at A15TP6, the + 15V supply at A15TP7, and the - 12.6V supply at A15TP8. If any of these voltages are low, refer to the mainframe Operation and Service manual and make the necessary adjustments before continuing.
MODEL 8559A SERVICE DPM Accuracy The following is a guide to troubleshooting poor DPM accuracy. Further information is included following the circuit descriptions of the indicated assemblies. Check + 14.5V supply on the Frequency Control Assembly A7 (A7TP3). Perform and verify Frequency Display Adjustment (Paragraph 5-30). Verify Tuning Accuracy (Paragraph 4-12). Check Marker Board Assembly A8. Check frequency accuracy of first and second local oscillators.
MODEL 8559A SERVICE DIGITAL PANEL METER ASSEMBLY Al, CIRCUIT DESCRIPTION The Digital Panel Meter (DPM) Assembly AlAl/AlA2 is a dc voltmeter that measures a tuning voltage from Marker Assembly A8, and converts it to a front-panel frequency readout. The DPM electronics are contained on two assemblies: the DPM Display Assembly A l A l and the DPM Driver Assembly A I M .
SERVICE MODEL 8559A Display Interface (E) During the period the DPM drive input is being converted, the BCD output circuitry in U3 is shut off. Once the conversion in U2 and U3 is complete, the four-line BCD is sent to U4 where it is converted to a seven-line (segment) drive. This seven-line output from U4 is fed in parallel to the displays on the Display Assembly A1A1.
MODEL 8559A SERVICE TABLE 81. DIGITAL PANEL METER ASSEMBLY Al, REPLACEABLE PARTS (2 OF 2) Reference Designation HP Part Number Description CI1NNFClOR T I 1 l llNT P I N 0 1 5 I N D X '97 5 9 D I O D T - Z N R IN1129 6 2 V 5% D:l 7 P D = 2'0d D I O D i ZNR 1N534PII 6 IJV 52 PD=5W T r = i . ' 0 0 Z CONNFCTOR PC EDCC 1 0 - C O N T I R O W 2 R W . ; SCRFW-MACH 6 3 7 , 3 7 5 I N LC BDT; UD-<.l 1 HFAT S I N K NUT-HFX-DTJL -ClIAM 6 - 3 7 1111) 1 2 5 I N TIhc .
MODEL 8559A SERVICE A1A2 DPM DRIVER ASSEMBLY DPM INPUT SIGNAL (This test point is located on the trace side of the circuit board.) A1 A1 DPM DISPLAY ASSEMBLY FIGURE 8-5.
SERVICE FRONT SWITCH ASSEMBLY A2, CIRCU!T DESCRIPTION Functions of the switches and potentiometers on the Front Switch Assembly A2 are covered in the circuit descriptions for the electronic assemblies they control.
SERVICE MODEL 8559A FRONT SWITCH ASSEMBLY A2 DISASSEMBLY AND REPAIR REMOVAL OF FRONT SWITCH ASSEMBLY FROM HP 8559A CHASSIS Turn H P 8559A upside down on a flat work surface. NOTE Numbers in parentheses match the numerical callouts on Figure 8-10 Front Switch Assembly (exploded view). All illustrations referenced in these procedures follow the last procedural step.
MODEL 8559A SERVICE 14. Disconnect 10-conductor ribbon cable connected to DPM Driver Assembly AlA2. Remove screw holding DPM Display Assembly AlAl to diecast. DPM window will fall out. 15. Use a 5/16-inch nut driver to remove the two nuts attaching front panel to Front Switch Diecast (1). Remove front panel from Front Switch Diecast. 16. Place Front Switch Assembly A2 on flat working surface with remaining knobs face-down and lock mechanism facing you.
MODEL 8559A SERVICE NOTE Rear Drive Hub (15) on Bandwidth Shaft (55) is preset flush with collar on shaft (see Figure 8-7B). Do not remove drive hub unless necessary for repair. 20. e. Use a no. 4 hex wrench to loosen the two screws on Coupling Hub (54) attached to Frequency Span Shaft (9), and remove hub from shaft. f. Remove the two Studs (53) used to support Bandwidth Switch Board (59). Remove Bandwidth Detent (52) from Front Switch Assembly.
SERVICE MODEL 8559A Misapplied grease might cause intermittent switch connections. Utmost care must be taken during reassembly to avoid excessive application of grease and contamination of switch contacts. Avoid getting grease on fingers. ASSEMBLY OF FRONT SWITCH ASSEMBLY 1. Assembly of Lock: a. Lightly grease Locking Shaft (3) and insert into Front Switch Diecast (1). Lightly grease bearing surfaces of Locking Link (5). b. Insert Lock Spring (2) into Front Switch Diecast (1).
SERVICE MODEL 8559A i. Inspect Attenuator Drive Rotor (8). Roll Pins (12) should be positioned in hole 1 and hole 9, as shown in Figure 8-8D. j. Inspect front Anticrush Drive Hub Assembly (7). Note that pin is offset to one side of drive hub; place drive hub over right-most bushing in Front Switch Diecast (I) with this side down (i.e., pin as close as possible to Front Switch Diecast) for proper switch operation.
SERVICE MODEL 8559A i. Use a no. 4 hex wrench to temporarily install SWEEP TRIGGER, SWEEP TIME/DIV, MANUAL SWEEP, and FREQ SPAN/DIV knobs. j. Tighten Stud (53) and left-most Screw (48) attaching Front Switch Board Assembly to Front Switch Diecast (1). Check all switch rotors for smooth, free switch action. Readjust position of Front Switch Board Assembly as necessary for proper switch action. k. Tighten the two remaining Screws (48) attaching Front Switch Board Assembly to Front Switch Diecast (1). 1.
SERVICE 5. MODEL 8559A k. Pull and turn FREQ SPAN/DIV Knob until a set screw is visible on Coupling Hub (54). Push FREQ SPAN/DIV knob in and out to align pin on Coupling Hub with slots in Bandwidth Rotor (56). With FREQ SPAN/DIV knob pushed in and Coupling Hub flush again Bandwidth Rotor (pin aligned), tighten set screw using a no. 4 hex wrench. Turn FREQ SPAN/DIV knob until second set screw is visible, and tighten second set screw. 1.
MODEL 8559A 6. SERVICE k. Use a no. 4 hex wrench to firmly tighten both set screws in front Anticrush Drive Hub (7). Recheck Ref Level Shaft (6) as in step j, and readjust front Anticrush Drive Hub as necessary. 1. Slip Miter Gear (51) over Attenuator Shaft Assembly (18). Do not tighten at this time. m. Inspect Ref Level Fine Assembly (30, 31, 65 - 69). Ref Level Fine Shaft (65) should turn smoothly. Check Ref Level Fine Potentiometer (69) and connecting wires for good electrical connections.
MODEL 8559A SERVICE 8. Installation of Knobs: a. Turn SWEEP TRIGGER Shaft (24) fully clockwise (as seen from front of Front Switch Assembly) to spring-loaded SINGLE position and release. Use a no. 4 hex wrench to install SWEEP TRIGGER knob with SINGLE line aligned with painted arrow on front panel. Check for proper switch operation and alignment. b. Turn SWEEP TIME/DIV Shaft (24) to align Ball Bearing (10) on SWEEP TIME/DIV Rotor with left-most edge of stop boss on Front Switch Diecast (1).
MODEL 8559A SERVICE INSTALLATION OF FRONT SWITCH ASSEMBLY INTO HP 8559A CHASSIS 9. Set Front Switch Assembly into place in chassis, being careful not to bend semi-rigid cables or pinch wires or ribbon cables. Attach Front Switch Diecast (1) to left and right side gussets with four screws. 10. Connect four wires (0,916,918,923) to correspondingly-labelled pins in Front Switch Board A2A1. 1 1. Attach DPM Driver Assembly A1A2 to diecast with one Screw. 12.
SERVICE MODEL B559A FACTORY PRESET SHAFT ASSEMBLIES REF LEVEL SHAFT BANDWIDTH SHAFT C FREQUENCY SPAN SHAFT NOTE Arrows point toward rear of HP 8559A FIGURE 8-7.
MODEL 8559A SERVICE A B SWEEP TRIGGER ROTOR SWEEP TIMEIDIV ROTOR HOLE # 1 HOLE #I7 C D FREQ SPANIDIV ROTOR ATTENUATOR DRIVE ROTOR HOLE # I HOLE #9 ' E F RESOLUTION BW ROTOR REF LEVEL ROTOR FIGURE 8-8.
MODEL 8559A SERVICE FIGURE 8.9.
SERVICE MODEL 6559A TABLE 8-2. FRONT SWITCHBOARD ASSEMBLY A2A1, REPLACEABLE PARTS Reference Designation HP Part Number Mfr Part Number Description 1 : 4 . 1/13 1 0 -It.?;' F ? I or, 366.
MODEL 8559A ------ L16 MOTHERBOARD 1 -- -- A2A1W1 RIBBON CABLE ASSEMBLY OpM - 1 A2A1W1 FANOUT RIBBON CABLE ASSEMBLY A2AlWlP2 AlAPJl ."Om, 2 . \lWlPl I % I .Lac. ."ow* 10 A2AlWlP3 1 A2AlJ3 I AlA2Jl PlNS ARE SHOWN AS SEEN FROM BOlTOM (CIRCUITSlDQof A1A2 DPM DRIVER PC BOARD. I. A2AlJ3 PlNS ARE SHOWN AS SEEN FROM TOP OF A2AlJ3 (FRONT OF REAR SWITCH BOARD ASSEMBLY). NOTE THAT A2AlJ3 CONTACTS 1,7,8, AND 14 ARE NOT USED.
MODEL 8559A SERVICE A2A1W2 RIBBON CABLE ASSEMBLY --- r-P/O A2 FRONT SWITCH ASSEMBLY '10 A16 MOTHERBOARD Pl RlbBMI O W L A21112 A2AlW2P2 PLUGS DIRECTLY INTO AND IS SOLDEREDTO PC BOARD PLATED-THRU HOLES, COLLECTIVELY DESIGNATED A2AlJ2. PIN ARRANGEMENT SHOWN FOR A16J2 IS AS SEEN FROM TOP (COMPONENT SIDE) OF MOTHERBOARD. PIN ARRANGEMENT SHOWN HERE IS AS SEEN FROM FRONT OF A2A1 FRONT SWITCH BOARD ASSEMBLY. FIGURE 8-12.
MODEL 8559A SERVICE ASSEMBLY NUMBERS REFER TO SCHEMATICS WHERE DIAGRAM OF INDICATED SWITCH OR CONTROL IS LOCATED. DIAGRAMS OF ALL SWITCHES AND CONTROLS ARE ALSO LOCATED ON THE A2 FRONT PANEL SWITCH ASSEMBLY SCHEMATIC.
- SERVICE - MODE1 MNEMONIC ALT IF B L CLIP BW1 BW2 BW3 BW4 BW5 C TUNE EXPAND FlNE TUNE FREQ ZERO FS 1 FS2 FS3 FS4 FS5 FS6 FS7 FS8 FS9 GAlN H2 H3 lFGl IFG2 IFG3 IFG4 IFG5 IFG6 LlNE TRlG LOGILIN MAN SCAN NOISE MEASURE PEN LIFT PM REF LEVEL CAL REF LEVEL CW REF LEVEL WP SIG I D SINGLE ST 1 ST2 ST3 ST4 ST5 ST6 ST7 SYNC TRlG TUNE REF VERT VERT POSN VlDEO VlDEO FILTER VlDEO TRlG 8-46 DESCRIPTION I ALTERNATE IF (LOW = A L T I F = 2.
SERVICE MODEL 8559A RF SECTION CIRCUIT DESCRIPTIONS List of parts included in RF Section. INPUT ATTENUATOR ASSEMBLY A3, CIRCUIT DESCRIPTION The H P 8559A Input Attenuator Assembly A3 is a 50 ohm, precision, coaxial step attenuator. Attenuation in 10-dB steps from 0 dB to 70 dB is accomplished by switching the signal path through one or more of three resistive pads in a predetermined sequence by the INPUT ATTEN control. The Input Attenuator Assembly A3 is not field serviceable.
SERVICE MODEL 8559A FIRST MIXER ASSEMBLY A4, TROUBLESHOOTING Typically, a bad first mixer results in at least a 15 to 20 dB loss in sensitivity (i.e., the amplitude of displayed signals is 15 to 20 dB low). There are, however, other factors that can affect spectrum analyzer sensitivity that should be checked. The measurement of power levels along the signal path can give a good indication of where the loss is occurring.
MODEL 8559A SERVICE SECOND CONVERTER ASSEMBLY A5, CIRCUIT DESCRIPTION The IF from the First Mixer Assembly A4 is coupled into the Second Converter Assembly A5 bandpass filter through coupling loop L3. Three circular, slug-tuned cavity resonators, operating as an inductive transmission line, make up the bandpass filter. The filter forms a high-Q circuit centered at 3 GHz with a 23 MHz bandwidth that is required to accommodate the regular and alternate IFs.
MODEL 8559A YIG-TUNEDOSCILLATOR ASSEMBLY A6, CIRCUIT DESCRIPTION The YIG-Tuned Oscillator Assembly A6 consists of three parts: a sealed magnet assembly that encloses the YIG sphere and oscillator; a bias board that uses discrete components to establish the oscillator and amplifier bias, as well as protect the bias supply from noise and voltage overloads; and a mu-metal magnetic-shield can. Field service of the YIG-Tuned Oscillator Assembly A6 is limited to replacement with a new or factory rebuilt unit.
MODEL 8559A SERVICE TABLE 8-3. RF SECTION, REPLACEABLE PARTS Reference Desianation HP Part Number Description Mfr Code , ll4R :I 3191111 :l>40'1 ,'
SERVICE MODEL 8559A Mfr. Code Mfr. Part Number Connector Assy (Type N) 28480 86290-60005 Body: RF Connector (Type N) 02660 131-150 Contact: RF Connector (Type N) 02660 131-149 Insulator 28480 5040-0306 Center Conductor 28480 08555-20093 Body: Bulkhead 28480 08555-20094 Washer: Lock 0.
MODEL 8559A SERVICE FIGURE 8-17, INPUT ATTENUATOR ASSEMBLY A3 FIGURE 8-18.
MODEL 8559A SERVICE - FIGURE 8-19, FIRST MIXER ASSEMBLY A4 FIGURE8-20. 4.
SERVICE MODEL 8559A OSCILLATOR HOUSING COVER MP1 L4 L5 2ND CONV OUT 52 2ND LO TUNING SLUG 2 4 J3 2N D MIXER MATCH L2 - TUNING SLUG 2 1 TUNING SLUG 2 2 OSCILLATOR TUNING SLUG 2 3 HOUSING COVER MP1 ~4 L1 C3 2ND LO OUTPUT J3 POS BIAS FL4 COUPLING POST MP4 SECOND CONVERTER OSCILLATOR ASSEMBLY A5A1 2ND C O NV E RTER 2ND LO POS TUNING SLUG 2 4 BlAS OUTPUT J2 FlGURE8-21.
MODEL 8559A SERVICE VA R FLl 2ND CONVERTER INPUT J l (UNDERNEATH) INPUT COUPLING LOOP L3 CAVITY B L OCK MP2 CR2 VARFL~ c k3 A5A2 SECOND CONVERTER FILTER ASSEMBLY P VARACTO R 1 V TO 28V FIGURE 8-21, SECOND CONVERTER ASSEMBLY A5, COMPONENT LOCATIONS (2 OF 2) 8-61
SERVICE MODEL 8559A YTO SHIELD COVER 7100-1273 YIG-TUNED OSCILLATOR ASSEMBLY A6 5086-7329 YIG ASSEMBLY INSULATOR 08559-00041 ( LOCATED O N SIDE O F CAN ) SPACER PLATE WITH HEAT SINK COMPOUND 08559-00039 LOCATED ON INSIDE OF CAN) YTO SHIELD CAN 7100-1272 FIGURE 8-22.
MODEL 8559A SERVICE --- --7 I N P U T ATTENUATOR 1 86240-60022 I A ~ ~ R S T ~ I M I XER 1 FLI 4 .
MODEL 8559A SERVICE YIG-TUNED OSCILLATOR ASSEMBLY A6 RE AR YI G MOUNTING BRACKET (08559-00036) FIRST MIXER S E C O ND C O NVERTER ASSEMBLY A5 (08565-60090) 3 dB ATTENUATOR ASSEMBLY AT1 FR O NT Y I G MOUNTING BRACKET (08559-00035) MIXER SUPPORT BRACKET (08559-00013) FIGURE &24.
SERVICE MODEL 8559A FREQUENCY CONTROL ASSEMBLY A7, CIRCUIT DESCRIPTION The Frequency Control Assembly A7 drives the YIG-Tuned Oscillator Assembly A6 and provides the regulated + 14.5V and - 10V supplies to the First Mixer Assembly A4, the Second Converter Assembly AS, and the Marker Assembly A8. Inputs to the Frequency Control Assembly A7 consist of the tuning voltage and the band information from the Front Switch Assembly A2, as well as the attenuated sweep from the Marker Assembly A8.
SERVICE MODEL 8559A Resistor R92 is an adjustable current limiter that makes possible sweep width adjustment by changing the gain of the stage. Delay compensation for FM coil swept spans is provided by U14, C14, R96*, and potentiometer R83, the delay compensation adjustment. YTO Main Coil Fixed Driver (F) This driver supplies current to the YTO main coil to set the start frequency of the first LO WIG-Tuned Oscillator Assembly A6) at approximately 3 GHz.
SERVICE MODEL 8559A RESIDUAL FM TROUBLESHOOTING FLOWCHART ANNOTATION In the next steps, edge connector contacts on the circuit board are taped over to isolate portions of the circuit. After completing a step where taping is necessary, remove the tape and clean the circuit board edge contacts with an 80120 solution of isopropyl alcohol and water before continuing to the next step.
SERVICE MODEL 8559A Observe 1 s t L.O. I s o l a t e YTO Main C o i l Tune D r i v e r Replace Tune Voltage w i t h I s o l a t e YTO FM Coil Driver YES Source o f FM i s YTO FM Coil Driver 0 Source o f FM 1s n a i n c o i l Tune D r i v e r 0 Source o f FM i s FM/Main C o i l I0 FM? I I NO 1 I s o l a t e YTO Main C o i l Fixed Driver Replace -1OV Regulator with Battery Ir Source o f FM i n -iOV Regulator 0 NO Source o f FM i s ~ a i nc o i l Fixed Driver .
MODEL 8559A SERVICE If the residual FM is unchanged, assume that the YTO Main Coil Fixed Driver is not its source. Retune the HP 8559A to minimum, .010 GHz. Isolate the YTO Main Coil Filter from the circuit by mounting the Frequency Control Assembly A7 on an extender board and taping over PI-19, PI-20, P1-25, while shorting PI-2 to PI-19. If the residual FM is unchanged, the probable source is the YIG-Tuned Oscillator Assembly A6.
SERVICE MODEL 8559A TABLE 8-4. FREQUENCY CONTROL ASSEMBLY A7, REPLACEABLE PARTS (3 OF 3) I Reference Designation HP Part Number Mfr Part Number Description I'I~NNI c r n r a r i m I C N N ~r l w . ,,r,I CCINNCI:TO11 -Sf;! ~,OIGN~I:IIIU ! , r , ~ I:ONN; C'II~B S(:I r o s r P I N 1 , IHM [r,uNr r B I NI . I 4 C:rliUT P T N 1 . 1 4 r , r w r PIN i , 1 4 I:INT P IN I i Q . FCC ! ; i sn nn 57 MM I G C 5 7 SU r m ux: : > / !,IJ nfi r:! so m: !.u n x sc R T W - n ~ r . :?~ x, .
MODEL 8559A SERVICE ALTERNATE I F DRIVERS TUNE/FULL SPAN VOLTAGE COARSE TUNE YTO MAIN COIL ORIVER SUMMING DRIVER ! > I tsv YOR- FS6 I YTO FW COIL DRIVER ' ' : - , -1OV VOLTAGE REGULATOR I , , - 1 TUNE REF t j 4 . s ~ tisv FIGURE 827.
SERVICE MODEL 8559A A7 FREQUENCY CONTROL ASSEMBLY SwP \ h *\ TUNE GND &YTO FIGURE 8-28.
MODEL 8559A SERVICE MARKER ASSEMBLY A8, CIRCUIT DESCRIPTION The Marker Assembly A8 comprises the Marker Generator, the DPM and Second LO Drivers, the ALT IF and SIG IDENT circuits, the Auto Scan Time Drivers, and the Scan Attenuators. Marker Generator (F) The Marker Generator is basically a zero voltage detector. The four summed resistor voltages at pin 5 of U14 equal OV only when the sweep voltage and the tune voltage correspond to the same frequency. The marker is then displayed at that frequency.
MODEL 8559A SERVICE Second LO Driver (E) The Second LO Driver varies the voltage applied to the varactors in the second LO cavity (A5CR2 and A5CR3). The upper limit of this voltage is dependent on the second LO sensitivity and varies during operation from about I V to between 7V and 30V. An increase in the drive voltage increases the second LO frequency. The SIG IDENT and ALT IF buttons both change the second LO frequency. ALT IF. When ALT IF is not selected, TP2 is at -7.
MODEL 8559A SERVICE Auto Scan Time (AST) Accuracy: Observe front panel switch positions to isolate the problem area. Auto scan time can also be affected by circuits on the Sweep Generator/Bandwidth Control Assembly A9 and the VIDEO FILTER control position. If the AST problem is band-related, the Marker Assembly A8 is the most probable cause. If the AST problem is either bandwidth- or scanwidth-related, the most probable cause is the Sweep Generator/Bandwidth Control Assembly A9.
SERVICE MODEL 8559A TABLE 8-5.
SERVICE MODEL 8559A -FSB ) SCAN ATTENUATOR , > - 0 . I I I ATTEN SWEEP LOQIC CONTROLLED YTO SYP I> I I I AST TIME DRIVERS , . m a I n m u ) L L l L H3 H2 FREO ZERO > ALT I F SIG I D RETRACE I 1, L . INPUT LOOIC I / VIDEO SYIFT m - LL r MARK=" GENERATO VIOEO SHIFT DPM - SECOND LOY DRIVER PM ALT I F SIG I 0 RETRACE FIGURE 8-31.
SERVICE MODEL 8559A A8 MARKER ASSEMBLY FIGURE 6-32.
MODEL 8559A SERVICE SWEEP GENERATORIBANDWIDTHCONTROL ASSEMBLY A9, CIRCUIT DESCRIPTION The Sweep Generator/Bandwidth Control Assembly A9 consists of the sweep generator circuit, the sweep trigger circuits, the resolution bandwidth control circuits, the video filtering circuits, the sweep attenuator circuit, and the sweep offset circuit. A linear sweep from - 5V to + 5V is provided by the sweep generator circuit.
SERVICE MODEL 8559A AMPL l F l E R =t1OV = +0.5V RETRACE SWEEP FIGURE 8-34. SIMPLIFIED SCHEMATIC OF SWEEP GENERATOR IN AUTO MODE With CR2 off, the current source begins charging the timing capacitor (C3 and C4, block I). As the timing capacitor charges, the output of the buffer amplifier increases linearly. Transistor 4 3 3 is on and its collector voltage is about + 0.5Y The voltage at U1 pin 2 is mainly established by sweep voltage divider R29, R39, and R47*.
SERVICE MODEL 8559A SW l TCH I @SWEEP D E A D TIME SWITCH 6&7 I I FIGURE8-35. SIMPLIFIED SCHEMATIC OF FASTISLOWSWEEP TIME OPERATION FastlSlow Sweep Time Operation Timing capacitors C3 and C4 provide fast and slow sweep operation (refer to Figure 8-35). When a sweep time less than or equal to 1 millisecond per division is selected with the SWEEP TIME/DIV switch, sweep control line ST6 is grounded. This turns sweep dead time switch 4 6 (block K) and fast sweep switch 4 7 (block J) off.
SERVICE MODEL 8559A Pulse Shaper (M) The pulse shaper circuit (block M) consists of an FET switch, a Schmitt trigger, a differentiator, and an emitter follower (see Figure 8-36). Field-effect transistor 456, and its associated components, disconnects the base of 435 during the sweep cycle to prevent the Schmitt trigger from firing during a sweep. Transistors 434 and 435 make up the Schmitt trigger. Transistor 435 is normally off; 434 is conducting.
MODEL 8559A SERVICE to the Pulse Shaper. Resistor A16R2 and capacitor A16C8 on the motherboard attenuate the ac line signal to approximately 1V peak-to-peak (at the base of 435) and filter line spikes. Single Sweep Triggering and Abort When the TRIGGER switch is in the single sweep position, the sync line is grounded and the single line open. Transistor 433 is held off by the voltage developed across CRlO and R53. The voltage at the collector of 433 is at + 10V, putting the emitter of 438 at + 9.
SERVICE MODEL 8559A switch that connects R34 to the comparator. Turning the manual sweep control (A2R4) adjusts the voltage at the control side of R34. Operational amplifier U1, operating in a linear mode, fixes the voltage at pin 2 by feedback through CR2, the buffer amplifier, and R29. This fixed voltage is applied through 439 to one side of R34. As the manual sweep potentiometer is adjusted, the voltage across R34 changes, varying the current supplied to pin 2 of the comparator.
MODEL 8559A SERVICE Crystal filter bandwidth is determined by the current on BW6. Transistor 413 in the Xtal PIN Driver Buffer (block D) is turned off, allowing 414 to establish the bandwidth control current. Depending on the setting of the RESOLUTION BW switch, one of the bandwidth control lines (BWl through BW3) is at + 15V while the remaining two are open and pulled to a negative voltage.
SERVICE MODEL 8559A Video Filter The video filter comprises control A2R6, RESOLUTION BW switch A2AlS5, and eight capacitors on the Sweep Generator/Bandwidth Control Assembly A9 (blocks A and B). VIDEO FILTER control A2R6 varies the resistance of the RC filtering network that it forms with the video filter capacitor.
SERVICE MODEL 8559A SWEEP GENERATOWBANDWIDTHCONTROL ASSEMBLY A9, TROUBLESHOOTING When making measurements at or near test points, be careful not to short adjacent points or circuit components together. Auto Scan Time (AST) Accuracy: Observe front panel switch positions to help isolate the problem area. Auto scan time can also be affected by circuits on the Marker Assembly A8 and the VIDEO FILTER control position. If the AST groblem is band related, the Marker Assembly A8 is the most probable cause.
SERVICE MODEL 8559A TABLE 8-6. SWEEP GENERATORIBANDWIDTHCONTROL ASSEMBLY A9, REPLACEABLEPARTS (1 OF 4) Reference Designation HP Part Number Mfr Code Description C A P A C I T C W F XD 1:IOi'F r - 1 9 % 1K'JI)c C E R I:APACI TOR - F r n Icr'F + - 2 % : ~ c n v n c r i P o I - 6 0 C A P A C I T O R-F X D .0;'711F + 1 3 % 700L'l;C P ( ! l f E C A P A C T T O R-F X D .
SERVICE MODEL 8559A TABLE 8-6. SWEEPGENERATORIBANDWIDTHCONTROL ASSEMBLY A9, REPLACEABLE PARTS (2 OF 4) Reference Designation HP Part Number Mfr Description Code - . I I PR1 ? 14 4 110 ,"mn :114110 1'411'1 .'1l91lIl :n Pfl!l ?~14l?Il 14011 7,'qInll . n w n ?I19110 0180 04717 :l'4ll:l .
SERVICE MODEL 8559A TABLE 6-6. SWEEP GENERATORIBANDWIDTHCONTROL ASSEMBLY A9, REPLACEABLEPARTS (4 OF 4) Reference Desianation HP Part Number Description I:ISNNI-CTOB -SGI. I;IINNFCTI,R- SLI. CONNECTOR SSI CCHNEClrlR :;(:.I CONNFCTO:J SCI. cnsr r,rlNT CrlNl C1tNT CONT P rN PIN PIN PIN PIN I 1 1 I I Mfr Part Number . i4 nn - r m sr . 1 4 -flH- K C 5 2 . 1 4 - H M -LlSC-!if . 1 4 - - f + - A X - !,Z .1 4 nn - sn !',Q SO LQ s x nr so CONNCCTOR-S6L CON1 P I N 1 .
SERVICE MODEL 8559A ESWEEP OENERATORIBANDWI DTH - I 0 MAN SCAN - d?? 0 -- --I CONTROL I FAST/SLOW SWEEP CAPACITORS I) ATTEN SWP 1 VIDEO FILTER TRIQ - SINBLE >BY1 6' I I LINE/VIDEO 1 # P I N DRIVERS I r' I -$, I - I - VERT $ I 0 0 0 - I - ' > - - _I FIGURE 838.
SERVICE MODEL 8559A A9 SWEEP GENERATOR/BANDWIDTH CONTROL ASSEMBLY 0 ADJ Q \ "L ADJ \ @ +lOV ADJ ' @ 1MS ADJ @ 5 MS' ADJ ' FIGURE 8-39.
SERVICE MODEL 8559A THIRD CONVERTER ASSEMBLY A10, CIRCUIT DESCRIPTION The Third Converter Assembly A10 contains a 321.4 MHz amplifier followed by a 321.4 MHz bandpass filter, a double balanced mixer, a 21.4 MHz IF preamplifier, a flatness compensation amplifier, and a band conversion loss compensating amplifier. Also included in the Third Converter Assembly A10 are the 35 MHz calibration oscillator and the 300 MHz third local oscillator. The 321.
SERVICE MODEL 8559A IF Preamplifier (F) The IF Preamplifier voltage gain is provided by Q8 in a common-emitter amplifier configuration. Circuit gain is controlled with collector-to-base feedback through PIN diode CR4. The current through CR4 is adjusted from the front panel by the REF LEVEL CAL control and can vary the gain of the IF Preamplifier over a 10 dB range. Transistor 4 7 functions as an emitter follower buffer amplifier.
MODEL 8559A SERVICE 35 MHz Calibration Oscillator (B) The 35 MHz Calibration Oscillator consists of a differential amplifier formed by Q l l and 412. A frequency determining tank circuit (L21, C45, and C46) is connected to the base of Q11. The base of 412 and one side of the tank are at RF ground due to C48. Capacitor C45 temperature-compensatesthe oscillator; R13 controls the bias current and output amplitude. As the base voltage of Q11 increases, the voltage at the emitters of Q11 and 412 increases.
MODEL 8559A SERVICE TABLE 8-7. THIRD CONVERTER ASSEMBLY A10, REPLACEABLE PARTS (1 OF 3) Reference Designation HP Part Number Description Mfr Part Number A1 0 h10L1 4 1 lr,' A 1 0C3 A 1 11 4 A l OC5 AI Or61 4 1 IlC7 AI n r c A 1 OC9 A 1 lri 3 AIPCll n i lnr 1 .
MODEL 8559A SERVICE TABLE 8-7.
MODEL 8559A TABLE 8-7. THIRD CONVERTER ASSEMBLY A10, REPLACEABLE PARTS (3 OF 3) Reference Designation HP Part Number Description AIOI<3b A 1 CN?,'? A 1 OR30 A1 3R79 A 1 OR40 nl J n z l A 1 OR42 A t 0R4 1 A L OR44 A 1 3R4'1 A L OR46 ~llJR17 A 1 OR48 OlJR19 A l OR50 hl l R V A 1 OR52 A 1 1R"r 3 Al(llI'1 n t nrlz ALOTP 3 n t n l r ? Al0lll A 1 1112 AIOVRI n i avn:' DTODr ZNB 5 . 1 1 U 5 % DO 35 P D .4W DTCDF 7 N R 5 .
SERVICE MODEL 8559A FLATNESS COMPENSATION AMPLIFIER NON-LINEAR FIGURE 842.
SERVICE MODEL 8559A A10 THIRD CONVERTER ASSEMBLY AlOWl 321.4 MHz IF IN @ 321.4 MHz BPF ADJUST 'Q C46 CAL FRED 300 MHz LO OUT (TEST CONNECTOR) 0 L12 LO ADJ \ FIGURE 6-43.
MODEL 8559A SERVICE BANDWIDTH FILTERS No. 1 and No. 2 ASSEMBLIES A l l and A13, CIRCUIT DESCRIPTION Bandwidth Filters No. 1 and No. 2 Assemblies A l l and A13 are identical except for some off-board connections. Bandwidth Filter No. 1 Assembly A1 1 is described here. Bandwidth Filter No. 1 Assembly A1 1 operates at 21.4 MHz with a variable bandwidth of 3 MHz to 1 kHz.
SERVICE MODEL 8559A emitter is fixed by R8. The collector, therefore, becomes a constant-current sink for 20 rnA of current supplied by Q1 and 43. A decrease in the current supplied by 4 3 results in increased current through Q1, keeping the current through 4 2 constant. If an LC filtered bandwidth is selected, BW5F (filtered bandwidth control line 5 in block C) supplies current via CR1 and R13 (see Figure 8-47); 4 3 is effectively removed from the circuit.
MODEL 8559A SERVICE When the 1 kHz bandwidth is selected, CR4 is biased on and has a resistance of about 60 ohms. This resistance forms a voltage divider with R,that results in signal amplitude loss across the crystal. Increased gain in the input buffer amplifier, caused by the load on 43, compensates for these losses. The gain increase occurs when the reduction in R, turns 4 3 on even harder, resulting in some of the feedback from R6 being shunted to ground through the collector of 43.
SERVICE MODEL 8559A The case capacitance of the crystal (C,) would cause a second resonant point, or dip, in the bandpass if compensation were not used to nullify its effects. Compensation is provided by 4 4 as a current equal to and opposite in phase with the current flowing through C,, as shown in Figure 8-51. Capacitor C15 (SYM) adjusts the phase of the compensating current. T0 UNITY GAIN BUFFER AMP TOIFROM 10 dB INPUT BUFFER AMP FIGURE8-51.
SERVICE MODEL 8559A FIGURE8-52. LC POLE MODEL A simplified schematic of the first LC pole is shown in Figure 8-53. The fundamental frequency-determining components are L6 and the center-tapped capacitance C16* and C20*. Positive feedback is applied to the centertap at 21.4 MHz to compensate for losses in the tank circuit. The application of feedback makes it important that C16* and C20* be about the same value for proper pole operation.
MODEL 8559A SERVICE Second Xtal Pole (G) The operation of the Second Xtal Pole is identical with the First Xtal Pole. Second LC Pole (F) Operation of the Second LC Pole is the same as the First LC Pole, except that R56* performs the same function as PIN diode CR5. Output Buffer Amplifier (H) The Output Buffer Amplifier is a complementary pair of transistors in which Q9 acts as a source follower with its output current boosted by Q10.
MODEL 8559A SERVICE TABLE 88. BANDWIDTH FILTER NO. 1 ASSEMBLY A l l . REPLACEABLEPARTS (1 OF 3) - Reference Designation - HP Part Number Mfr Code Description A l l C27 A1 lC28 ~11rz9 A1 lC30 hl l C 3 l CAPACITOR - F X D ?;'OPT t - 5 % 30OVDC M [ C A CAPACITCIR f XD 1:'PF t 52 5 D J V C C I L R CAPACITOR - V TRMR -CCR 5 . 5 1flI'F 3 5 0 V CAPACITIIR-FXD 1 l l f + - 7 0 % 50L'ljC I . I R CAPACITOR F X D .OIUI= + R D - ? c % IOOVDC crt: . CAPACI TOR F X D n i u r + o n 207.
SERVICE MODEL 8559A TABLE 8-8. BANDWIDTH FILTER NO. 1 ASSEMBLY A l l , REPLACEABLE PARTS (3 OF 3) Reference Designation HP Part Number Mfr Code Description R T ' i l ' i l n R 5 1 1 1 % . l ? b W F 1C: 0 4 - 1 0 0 RESISTOR 10I( 1% .
MODEL 8559A I I BY6 BY5 [POLE SELECTION1 BY8 [CRYSTAL BANOYIOTH CONTROL) BY7 -- [LC BANOYIOTH CONTROL) -- FIGURE 8-54. BANDWIDTH FILTER NO.
MODEL 8559A SERVICE STEP GAIN ASSEMBLY A12, CIRCUIT DESCRIPTION The Step Gain Assembly A12 provides from 0 to 50 dB amplification of the 21.4 MHz IF in 10 dB steps, as selected from the REFERENCE LEVEL control. A zero to - 12 dB REFERENCE LEVEL FINE attenuator control is also included on the front panel. Generated on the Step Gain Assembly A12 are the first mixer diode bias and a flatness control voltage proportional to the sweep plus tune (S + T) voltage.
SERVICE MODEL8559A The maximum current flow through the PIN diode is set with the 0 dB potentiometer R35. Resistor R35 is adjusted to the 12.3 dB attenuation point with the REFERENCE LEVEL FINE control set fully counterclockwise (0 position). Transistors Q5 and 4 7 are identical current sources. The maximum current is set with the 0 dB adjustment, R35, in the common base circuit. Diode CR5 provides temperature compensation for the transistors.
MODEL 8559A SERVICE Band Offset (D) Operational amplifiers U4a, U4d, U4c, and their associated circuits provide offset and gain for the tilt voltage. Potentiometers R57, R58, R59, R60, R61, and R62 are used to adjust the offset of each band. A fixed negative offset is provided for all bands by operational amplifier U4c. The resulting flatness output voltage is applied to a voltage-controlled amplifier on Third Converter Assembly AlO.
MODEL 8559A SERVICE + 5.1V Reference (K) Transistor 4 4 and its associated circuitry operate off the for the flatness and mixer diode bias circuit. + 15V supply to furnish a regulated + 5.1V reference Power Supplies (J) Extensive filtering of the + 15V, + 12V, and - 12.6V inputs is needed to reduce coupling between each step gain amplifier and between the Step Gain Assembly A12 and the other assemblies.
SERVICE MODEL 8559A TABLE 8-10. STEP GAIN ASSEMBLY A12, REPLACEABLEPARTS (1OF3) - Reference Designation HP Part Number Mfr Code Description :f14R0 . ?clc.IlO n4RlI 211 411(1 lh:l$? ?041111 CAPACITOR FXD r C:'C~ITI R F A D CAPATTTOR r x D OIIJF ~ n Cllll- I 3 0 :ILJI Inn 0 I l l ? +$I(. O l l l F I113 CAPATSTOR F X D r r , r 1 r , r 1 ir,R f $1) n2 0 2 i o n u c r : ICCL'DC :!ax i o r v r c ;.'It2 1CI:VDC ?.1% IJ0';CC ?CX I ~ R I:I I.' I IR (:I I.
SERVICE MODEL 8559A A12 STEP G A I N 0- 12 dB CONTROL REF LEVEL WP \ 1 REF LEVEL CY I ( 10 dB AMPLIFIER 21.4 MHz 20 dB AMPLIFIER 2ND 20 dB AMPLIFIER IF61 I IF62 St1 FLATNESS BAND .Ol-s 6-g H2 BAND SELECT DECODER si: MIXER DIODE BIAS r ,' DIODE BIAS - 12.1- 21 / 9 0 0 9 FIGURE 858.
MODEL 8559A SERVICE BANDWIDTH FILTER No. 2 ASSEMBLY A13 Bandwidth Filter No. 2 Assembly A13 is very similar to Bandwidth Filter No. 1 Assembly A11, and corresponding components have the same reference designators. The differences between the two assemblies are in the TO/ FROM designations listed on the schematic diagrams. Refer to the Bandwidth Filter No. 1 Assembly A1 1 circuit description for complete information on circuit operation.
SERVICE MODEL 8559A TABLE 8-11. BANDWIDTH FILTER NO. 2 ASSEMBLY A13, REPLACEABLEPARTS (2 OF 3) I Reference Designation HP Part Number Description D t O D r SWrTCHINC ?0V 7594 1CN'i DlllDl' PJN 113V TI?AN!:lSTOR PNP 2NI?251 ST TO 1 8 PD :3hOMIJ RCSISTOR 1 0 0 1 % ,125W F 1I:::OI - 1 0 0 6 . 0 l K 1 % . l i ' 5 W f- lC=iIl- 1 0 0 RES1:;TCIR RFSISTOR 1 . 4 7 K 1 % .
r.=r.r.ri i --L*CcG* * "7-i-2~: qi.---.-- <=roc c h = o P cm w c ~ ~G o eg r u i Y . rrr4r.r.r. . -.. Y - ehc*? u : n o n u caaaa i?nr.*r, an = z a = L? L? 0 L> L- L1 L) U C U U U 6 : C .Y C h .
SERVICE MODEL 8559A F I R S T CRYSTAL POLE SECONO CRYSTAL POLE I I BY6 BY5 (POLE SELECTION) I BY6 (CRYSTAL BANOYIOTH CONTROL) BY7 (LC BANOYIOTH CONTROL] 0 0 - 9 FIGURE 6-61. BANDWIDTH FILTER NO. 2 ASSEMBLY Al3, BLOCK DIAGRAM 9 0 -.
SERVICE MODEL 8559A LOG AMPLIFIER ASSEMBLY A14, CIRCUIT DESCRIPTION The Log Amplifier Assembly A14 includes seven amplifier stages, each capable of providing linear and logarithmic amplification. A detector circuit following the amplifier stages detect.7 the amplified 21.4 MHz IF signal, producing the vertical display signal. The offset circuit that follows the detector operates in Log mode to offset the vertical display signal in 100 mV steps.
SERVICE MODEL 8559A Resistance R, is at a minimum (approximately 150 ohms) for small signals. The small signal gain of the stage (about 10 dB) is established by the dc bias through the log diodes. As the signal level at the emitter of 413 increases, signal current cancels bias current in the log diodes, increasing R,. The gain of the stage for large signals is reduced to unity (0 dB) as R, becomes very large. Linear Mode of Operation.
SERVICE MODEL 8559A SECOND STAGE / i1iV A- \ i1lV - C FEEDBACK P I T H 1, . -1OdB ADJUST LOG/LIN LINE - B V T .Jk-@$Q 2 4 FIGURE &66.10dB GAIN OPERATIONIN LINEAR MODE, SIMPLIFIED SCHEMATIC collector of 424 goes to - 8 VT, turning the log diodes on. In Lin mode, the LOG/LIN line is at turned off and current flows through R34 (LIN) to stages 6 and 7.
SERVICE MODEL 8559A Buffer Amplifier (L) The detector's output, the video signal, is amplified by the Buffer Amplifier. Differential pair 421 and driver 422 approximate a noninverting operational amplifier with a gain calculated by the formda: Gain = 1 + RllO/R116 Which becomes: 1 + 619/619 = 2 Log Offset (M) The offset circuit operates in Log mode to offset the video signal in four 100 mV steps. These appear on the display as 10 dB steps of apparent gain.
SERVICE MODEL 8559A TABLE 8-12. LOG AMPLIFIER ASSEMBLY A14, REPLACEABLE PARTS (4 OF 4) Reference Designation HP Part Number Description Mfr Part Number C 4 1 / 0 - T 0 If,?.' F C4 1/0 TO-1033 F R F S I G T O R 2.37K 1% .125W F T C = O + - 1 0 0 1FRHlIdAL TFRMINAL TERMJNAI TCRMINAI..
SERVICE MODEL 8559A I LO6 AMPLIFIER I LO6 MODE TEWPERATURE CONTROLLEO ATTENUATOR I DETECTOR I I ) b BAIN CONTROL LINES IF65 IF65 IF68 IF68 ",6/LIN C 1- POWER SUPPLY FIGURE 8-67.
SERVICE MODEL 8559A VERTICAL DRlVlNGlBLANKlNG ASSEMBLY A15, CIRCUIT DESCRIPTION The Vertical Driving/Blanking Assembly A15 contains a preamplifier to amplify the detected and filtered video received from the Log Amplifier Assembly A14. It also supplies the video signal needed to trigger the sweep generator in the video trigger mode. Following the preamplifier is the vertical driver, a differential amplifier that drives the vertical deflection plates in push-pull.
SERVICE MODEL 8559A Beamfinder With 1 dB per division selected, the baseline is off-screen. Without a visible signal present, there is no displayed trace. This condition could be misinterpreted as a display malfunction. On an H P 180 series mainframe, a visible trace can be produced by pressing the BEAMFINDER switch on the mainframe. This causes the - 12.6V on the beamfinder line to be removed, turns Q19 off, and disables the current source, U2c.
MODEL 8559A SERVICE Sweep Ramp HighlLow Limit Comparator (C) Operational amplifiers U l a and U l b are connected to form a comparator circuit. A voltage divider, comprising resistors R6, R7, and R8, establishes a high voltage reference at U l a pin 2 and a low voltage reference at U l b pin 5. The switching limits are approximately + 5V and + 0.7V, respectively. The signal applied to other inputs of the comparator is the YIG tuning voltage, the same signal that drives the YIG main coil.
MODEL 8559A SERVICE output to the mainframe, 4 4 must receive a positive voltage. The Blanking Driver is driven by the Vertical/ Baseline Comparator and the Sweep Ramp High/Low Limit Comparator. Either of these circuits can produce the positive input needed by the Blanking Driver to produce a blanking output. Penlift Driver (G) The display is blanked during retrace and during the dead time of the sweep ramp.
MODEL 8559A TABLE 8-13. VERTICAL DRlVERlBLANKlNG ASSEMBLY A15, REPLACEABLE PARTS (1 OF 2) Reference Designation HP Part Number Description I : I 1 N N I ~ C I O I ? S!;l I-I:IW: c l l m V,I C I I X T P I N 1 , I S MH rl ;!: ! ; I SQ r:!:tdr t 8 i t 4 i , I $ v,u IC:,I: ' ; J :,IJ i 1 7 r w , r q 1 r 1 ~l > w T l ? A ~ ~ ; l ~ ; T ~ lNl*bl 12 IPAN';~I,IIIR INPN ~I)AN:;I:;~!I:J NI'N 12AtJ';TC.IrIR N1114 :,NJ:'~,I !;I 117 111 1 ' 0 : f , i r u ? N 3 4 4 I l !;I Ill 5 P I , - l W ;N.
SERVICE MODEL 8559A TABLE 8-13. VERTICAL DRIVEFLUANKING ASSEMBLY A15, REPLACEABLE PARTS (2 OF 2) Reference Designation HP Part Number Description HCSJSTOR 100C 1 % 125W r T r - O + 1CO RFSTr,lCiR 1 . 9 f K 1 % 125W F T r = D i 1 0 0 CONNCCTOR-SGI CONT P I N 1 . 1 4 M f i - R S C S 7 SQ r , o t w r C i c , R SGL CONT P J N 1 . 1 4 HH r m - r ; z zo 7C IIP AHP C P CllAL TO- 5 9 P K G THANSTSTOR ARW4Y 1 4 P I N PLSTC DJP D I U D F 7NR 1 h R P 3 6 2 V 5 % DO 7 PD=.
SERVICE MODEL 8559A r-- 0 - 0 -7 0 A15 V E R T I C A L D R I V E R I B L A N K I N G VERTICAL DRIVER GAIN VERT - VERT + > > VER? POSN I VIDEO TRIG PREANPLIFIER AUX VERT I I > I i SWEEP RAMP HIGWLOY L I M I T COMPARATOR BLANKING DRIVER - I PENLIFT DRIVER PENLIFT RETRACE SWEEP INDICATOR DRIVER (r * SUP LEO I FIGURE 8-73.
MODEL 8559A SERVICE A15 VERTICAL DRIVERJBLANKING ASSEMBLY VERTICAL DEFLECTION OUT L @ J1 52 VERT (-1 VERT {+) \ R1 & 53 L NORM I /Y 1 dB OFFSET 0 GND FIGURE 8-74.
MODEL 8559A TABLE 8-14. MOTHERBOARDASSEMBLY A16, REPLACEABLEPARTS (1 OF 2) Reference Designation HP Part Number Mfr Part Number Description I:ONNL CTOR TClNNTrlrIR CONNFCTOR CT'NNl TTrlR CONN Pn?T 4 0 P I N M RC 1:TANI'IIL AR 4 3 P l N M R E T T A h I l l l AR R r SHD ti P C 5 0 niln XF ' R 5NP R PC 5 0 Ql-R 1 0 0 P T N SPCC 9 - T O N I TYI'C DIODK ZNB 1N53511.
SERVICE MODEL 8559A TABLE 814. MOTHERBOARDASSEMBLY A16, REPLACEABLE PARTS (2 OF 2) Reference Designation HP Part Number Description A l b MISCFLL ANFnlJS FfcRTS C A N II T I C , 0 6 7 - - . 6 : ? 5-DTA , C 9 1 -WD NIL. CC!NNFClOR- SGL LnNT $KT 9.32 JN IICC '.i7 INSUL ATOR RCCPT .
MODEL 8559A SERVICE A16 MOTHERBOARD ASSEMBLY L r - I I I I I L - I 0 '-7 r r ' I I I J2 -------------- I I I I I I I J L r - - 7 -7 ~' I 1r . I I * I J1 --------- I -----A LRlL Ff$ DIODE /BI AS mm Q TP1 riil 8/ XA7 , r I b % - , 'I 1 -4 XAlOP2 XA0 rn XA9 RE\ ""pT, XAlOPl . lclllcl21 lc13, l XAll r* I L - -t-J' C2 C l F ['Jij '"' XA12 I L31m-j XA13 0 XA14 -- kV'L ; r LUL, XI15 A E X T HORlZ Q A I N FIGURE 876.
HEWLETT-PACKARD SALES AND SERVICE OFFICES T o obtain servicing information o r t o order replacement parts, contact the nearest HewlettPackard Sales and Service Office listed in the HP Catalog, o r contact the nearest regional office listed below : IN THE UNITED STATES IN GERMAN FEDERAL REPUBLIC CALIFORNIA 3 9 3 9 Lankershim Boulevard North Hollywood 9 1 6 0 4 Hewlett-Packard GmbH Vertriebszentrale Frankfurt Berner Strasse 1 17 Postfach 560 140 D-6000 Frankfurt 56 GEORGIA P.O.
