HP 8559A - Manual

MODEL 8559A GENERAL INFORMATION 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...

GENERAL INFORMATION MODEL 8559A ADAPTER SIDE STOP K I T 1250-0780 08558-601 31 SPECTRUM A N A L Y Z E R O V E R L A Y K I T 5060-03 1 9 FIGURE 1-1. HP MODEL8559A SPECTRUM ANALYZER AND ACCESSORIES SUPPLIED 1-0

MODEL 8559A GENERAL INFORMATION SECTION I GENERAL INFORMATION 1-1. INTRODUCTION 1-2. This Operation and Service manual contains information required t o install, operate, test, adjust, and service the Hewlett-Packard 8559A Spectrum Analyzer. Figure 1-1 shows the instrument and acces- sories supplied...

GENERAL INFORMATION MODEL 8559A 1-1 1. SAFETY CONSIDERATIONS 1-12. Before operating this instrument, you should familiarize yourself with the safety markings o n the instrument and safety instructions in this manual. This instrument has been manufactured and tested according t o international safety...

MODEL 8559A GENERAL INFORMATION TABLE 1-1. HP MODEL8569A SPECIFICATIONS (1 OF 4) SPECIFICATIONS FREQUENCY SPECIFICATIONS FREQUENCY RANGE 10 MHz to 21 GHz, covered in six pushbutton- selectable ranges: Frequency Mixing Band Mode G Hz (n) Lowest Freq (GHz) [ALT IF] 0.010 [0.025] 6.035 [6.020] 3.033 [3...

GENERAL INFORMATION MODEL 8559A TABLE 1-1. HP MODEL 8559A SPECIFICATIONS (2 OF 4) Maximum lnput (without damage) Levels Total Power: + 2 0 dBm (O.lW, 2.2 Vrms) with 0 dB input attenuation + 3 0 dBm (lW, 7.1 Vrms) with 10 d B input attenuation DC: AC (<I00 Hz): 7.1 Vrms Peak Pulse Power: + 50 dBm ...

MODEL 8559A GENERAL INFORMATION 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 Refer- ence Level. Log Incremental Accuracy: 0.1 dB per dB from Reference Level Log Maximum Cumulative Error: 1.5...

MODEL 8559A GENERAL INFORMATION TABLE 1-2. MODEL SUPPLEMENTAL CHARACTERISTICS (1 OF 3) SUPPLEMENTAL CHARACTERISTICS NOTE: Values in this table are not specifications. They are typical characteristics included for user information. FREQUENCY CHARACTERISTICS FREQUENCY ACCURACY Frequency Cal Adjusts di...

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 Intermodulation Distortion Relative Dis...

MODEL GENERAL INFORMATION TABLE MODEL SUPPLEMENTAL CHARACTERISTICS 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 I F signal (lin- early related t...

GENERAL INFORMATION MODEL 1-26. EQUIPMENT REQUIRED BUT NOT SUP- PLIED 1-27. Display Mainframe 1-28. An H P 853A digital Spectrum Analyzer Dis- play is recommended for use with the H P The rear panel of the H P 853A mainframe provides t h e following o u t p u t connections: H O R I Z (SWEEP), VERTIC...

MODEL GENERAL INFORMATION 1-41. SERVICE ACCESSORIES 1-44. Table 1-4 lists all of the equipment required f o r t e s t i n g , a d j u s t i n g a n d t r o u b l e s h o o t i n g t h e 1-42. Service accessories are shown in Figure 1-6. Hewlett-Packard Model Spectrum Analyzer. Other equipment may be...

MODEL 1 2 3 4 5 6 7 8 9 1 0 11 12 13 Description Board Puller, 2 prongs t o lift PC boards Extender Board, 6 pin, 12 contacts Extender Board, 1 0 pin, 20 contacts Extender Board, 1 2 pin, 24 contacts Extender Board, 22 pin, 4 4 contacts Extender Cable Assembly, for plug-in operation out of display m...

GENERAL INFORMATION TABLE RECOMMENDEDTEST OF 4) MODEL I n s t r u m e n t Display Mainframe Sweep Oscillator R F Plug-In C o m b G e n e r a t o r S p e c t r u m Analyzer Synchronizer Critical Specifications H P 1 8 0 Series w i t h Variable Persistence Mainframe for R F Plug-Ins below. External Sw...

MODEL TABLE RECOMMENDEDTEST GENERAL INFORMATION Critical Specifications Frequency: 5 0 0 Hz Display Amplitude : -1 5 Vdc Single-Channel Frequency Range : 2 0 MHz t o 2 3 Sensitivity: -1 5 Resolution: 0.1 MHz Time Interval Measurement from 1 ms t o 5 0 0 ms Range: -12 t o Vdc Accuracy: Range : -20 t ...

GENERAL INFORMATION TABLE RECOMMENDED TEST OF 4) MODEL I n s t r u m e n t Fixed Attenuator (2 required) Fixed Attenuator Crystal Detector Termination Tuning Voltage Circuit Crystal Bypass Networks Special Extender Board Extender Cable Cable Cable Cable Cable Cable Test Cable Critical Specifications...

MODEL INSTALLATION AND OPERATION VERIFICATION SECTION INSTALLATION AND OPERATION VERIFICATION INTRODUCTION 2-2. This section includes information on initial inspection, preparation for use, and storage and shipping requirements for the H P INSPECTION Inspect the shipping container for damage. If the...

INSTALLATION AND OPERATION VERIFICATION 2-12. To install side stops: 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.) Use machine s...

MODEL INSTALLATION AND OPERATION VERIFICATION 4. Graticule Overlays 7. Operating Environment 2- 15. To install a graticule overlay: 1 Select proper overlay. H P Part Number 8565 is for H P display mainframes, H P P a r t Number 5020-8566 is for H P display mainframes, a n d H P P a r t Number 5020-8...

INSTALLATION AND OPERATION VERIFICATION MODEL 2-21. STORAGE AND SHIPMENT 2-22. Environment 2-23. The instrument may be stored or shipped in environments within the following limits: Temperature: - 40°C t o + 75°C Altitude: meters (25,000 feet) The instrument should also be protected from tem- peratu...

MODEL INSTALLATION AND OPERATION VERIFICATION D H P Part No. Description CARTON- OUTER FOAM PADS- INNER MANUAL PAD- FRONT CARTON- INNER BAG- ANTISTATIC FIGURE PACKAGING FOR SHIPMENT USING FACTORY PACKAGING MATERIALS

OPERATION MODEL 3-17. The frequency group enables the operator t o control how the Spectrum Analyzer displays the fre- quency domain. The RESOLUTION BW and FREQ controls, when pushed in, are coupled together, and moving either control moves the other. When the SWEEP control is in the AUTO position, ...

MODEL OPERATION spectrum analyzer is calibrated for absolute ampli- tude and frequency measurements. Set the controls as shown in Table 1 before you start the adjustment procedure. TABLE 1. ADJUSTMENT Function Spectrum Analyzer Plug-In INPUT (dB)* REFERENCE LEVEL Option 0 0 2 REF LEVEL FINE Amplitud...

OPERATION 3-31. Frequency and Amplitude Adjustments Adjust VERTICAL POSN t o align the CRT trace with the bottom graticule line. Center the LO feedthrough the "signal" at MHz) on the CRT with the TUNING control. Narrow the FREQ t o 200 kHz. Adjust the REF LEVEL FINE control as neces- sary t ...

MODEL PERFORMANCE TESTS SECTION PERFORMANCE TESTS INTRODUCTION The procedures in this section test the electrical performance of the instrument using the specifica- tions in Section I as the performance standards. The performance tests included in this section are listed in Table Most of the tests c...

MODEL P E R F O R M A N C E TESTS PERFORMANCE TESTS 4-11. FREQUENCY SPAN ACCURACY (Cont'd) PROCEDURE: 1. Set equipment controls as follows: Spectrum Analyzer: TUNING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RESOLUTION BW OPTIMUM, coupled (pushed in) INPUTATTEN REFERENCEL...

MODEL PERFORMANCE TESTS PERFORMANCE TESTS 1. FREQUENCY SPAN ACCURACY (Cont'd) FIRST GRATICULE LINE COMB SIGNALS FIRST SPECTRAL LlNE NINTH GRATICULE LlNE NINTH SPECTRAL LlNE CENTERFREQUENCY FREQUENCY SPAN ACCURACY MEASUREMENT FOR NINTH SPECTRAL LINE Set FREQ t o 5 MHz. Adjust TUNING control to positi...

PERFORMANCE TESTS MODEL PERFORMANCE TESTS 1. FREQUENCY SPAN ACCURACY (Cont'd) 13. Set function generator frequency to 200 kHz 0.5%) using frequency counter. Connect function genera- tor output t o comb generator MODULATION input. Set function generator OUTPUT LEVEL for a clean 200-kHz comb on the sp...

MODEL PERFORMANCE TESTS PERFORMANCE TESTS 2. TUNING ACCURACY SPECIFICATION: 0.1 - 3.0 (1 MHz + 0.3% of center frequency) 3.0 - 21.0 (5 MHz + 0.2% of center frequency) DESCRIPTION: An external RF source is used to provide a frequency-calibrated input signal t o the spectrum analyzer for three points ...

MODEL PERFORMANCE TESTS PERFORMANCE TESTS 4-12. TUNING ACCURACY NOTE The 10 dB attenuator should be connected directly to the INPUT of the spectrum analyzer and the power splitter (no cable assembly should be used between attenuator and analyzer or power splitter). 8 . Adjust sweep oscillator for CW...

MODEL PERFORMANCE TESTS PERFORMANCE TESTS 4-13. RESIDUAL FM (Cont'd) Comb Generator: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . COMB FREQUENCY - 100 MC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INTERPOLATION AMPLITU...

PERFORMANCE TESTS PERFORMANCE TESTS MODEL 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 CW signal is applied at a - 20 level t o the ...

PERFORMANCE TESTS PERFORMANCE TESTS MODEL 4-15. RESOLUTION BANDWIDTH ACCURACY SPECIFICATION: Individual resolution bandwidth 3-dB points are calibrated t o 15% 30% for 3 MHz bandwidth). DESCRIPTION: Resolution bandwidth accuracy is measured in the linear mode t o eliminate log amplifier errors. Sinc...

MODEL PERFORMANCE TESTS PERFORMANCE TESTS 5. RESOLUTION BANDWIDTH ACCURACY 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. ...

PERFORMANCE TESTS MODEL PERFORMANCE TESTS 5. RESOLUTION BANDWIDTH ACCURACY (Cont'd) 5. Tune signal generator frequency until trace drops t o 5 divisions above graticule baseline. Record signal generator frequency. MHz 6. Tune signal generator frequency in direction opposite t o that of step 5 until ...

MODEL PERFORMANCE TESTS PERFORMANCE TESTS 4-15. RESOLUTION BANDWIDTH ACCURACY D l S P L A Y S I G N A L GENERATOR . R F OUTPUT FIGURE 4-10. RESOLUTION BANDWIDTH ACCURACY TEST SETUP, 30 TO 1 In the following procedure, the plug-in must be removed from the display mainframe and connected through the e...

MODEL PERFORMANCE TESTS PERFORMANCE TESTS 5. RESOLUTION BAN ACCURACY (Cont'd) 19. Set RESOLUTION BW t o 3 kHz, leaving FREQ set t o Repeat steps 14 through 17. Min. Actual Max. 2.5 kHz 3.45 kHz 20. Set RESOLUTION BW t o 1 kHz, leaving FREQ set t o Repeat steps 14 through 17. Min. Actual Max. 0 . 5 k...

PERFORMANCE TESTS PERFORMANCE TESTS MODEL 4-16. RESOLUTION BANDWIDTH SELECTIVITY SPECIFICATION: resolution bandwidth ratio: < 15: DESCRIPTION: The 60-dB bandwidth is measured for all resolution bandwidths. The 60- t o 3-dB resolution bandwidth ratio (shape factor) is then computed for each bandwi...

MODEL PERFORMANCE TESTS PERFORMANCE TESTS 4-16. RESOLUTION BANDWIDTH SELECTIVITY (Cont'd) PROCEDURE: 1. Set equipment controls as follows: Spectrum Analyzer: TUNING RESOLUTIONBW INPUTATTEN REFERENCELEVEL REFLEVELFINE SWEEP AUTO SWEEPTRIGGER ALTIF OFF SIGIDENT OFF BLCLIP OFF VIDEO FILTER 12 o'clock S...

PERFORMANCE TESTS MODEL P E R F O R M A N C E TESTS 4-16. RESOLUTION BANDWIDTH SELECTIVITY (Cont'd) 5 . 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 ...

MODEL PERFORMANCE TESTS PERFORMANCE TESTS 6. RESOLUTION BANDWIDTH SELECTIVITY Signal Generator: COUNTERMODE OFF FM OFF FREQUENCYTUNE RF ON OUTPUTLEVEL 12. Connect equipment as shown in Figure 4-12. SPECTRUM ANALYZER GENERATOR OUTPUT I INPUT ADAPTER t ADAPTER FIGURE 4-12. RESOLUTION BANDWIDTH SELECTI...

PERFORMANCE TESTS MODEL PERFORMANCE TESTS 4-17. AVERAGE NOISE LEVEL (Cont'd) PROCEDURE: 1. Set spectrum analyzer controls as follows: TUNING RESOLUTION BW 3 MHz, uncoupled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INPU...

PERFORMANCE TESTS MODEL P E R F O R M A N C E TESTS - - 4-19. FREQUENCY RESPONSE SPECIFICATION: Frequency response measured with 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 specificatio...

PERFORMANCE TESTS MODEL 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 Pane...

MODEL P E R F O R M A N C E TESTS PERFORMANCE TESTS 4-19. FREQUENCY RESPONSE (Cont'd) 4. Adjust spectrum analyzer TUNING control for a FREQUENCY readout of 0.100. Set sweep oscilla- tor to CW with frequency of 100 MHz and use CW control t o center signal on spectrum analyzer display. 5 . Calibrate a...

MODEL PERFORMANCE TESTS PERFORMANCE TESTS 4.19. FREQUENCY RESPONSE Frequency Response, 3 - 18 NOTE For the higher frequency bands, multiple responses may appear on spec- trum analyzer display during frequency response measurement. Adjust INTENSITY control as necessary for optimum display of in-band ...

PERFORMANCE TESTS PERFORMANCE TESTS MODEL - - 4-19. FREQUENCY RESPONSE (Cont'd) 21. Select 9 - 15 frequency band on spectrum analyzer. Set sweep oscillator t o CW and frequency t o 12.0 Use CW control to center signal o n spectrum analyzer display. Trigger a 6 sweep. Adjust spectrum analyzer TUNING ...

MODEL PERFORMANCE TESTS PERFORMANCE TESTS 4-19. FREQUENCY RESPONSE (Cont'd) 26. Subtract mean deviation of step 16 from maximum and minimum values recorded in step 25. Frequency response for 12.1 - 18 portion of 12.1 - 21 frequency band should not exceed 2.3 dB 2.3 divisions). Maximum divisions (12....

PERFORMANCE TESTS PERFORMANCE TESTS MODEL 4-19. FREQUENCY RESPONSE (Cont'd) TABLE CORRECTING FOR FREQUENCY RESPONSE OF SIGNAL SOURCE Frequency 18.0 *deviation relative to Power Meter lndication Power Deviation* (Ref .) Deviation from Center Graticule Line (divisions or dB) power meter indication at ...

MODEL PERFORMANCE TESTS PERFORMANCE TESTS 4-20. COMPRESSION SPECIFICATION: Gain compression is less than 0.5 dB for a - 10 input level with dB attenuation. DESCRIPTION: Gain compression is measured by changing the power level at the spectrum analyzer input from - 20 t o - 10 The displayed signal lev...

PERFORMANCE TESTS MODEL PERFORMANCE TESTS BANDWIDTH SWITCHING (AMPLITUDE VARIATION) SPECIFICATION: Bandwidths 3 MHz to 300 kHz: < dB Bandwidths 3 t o kHz: < dB DESCRIPTION: The CAL OUTPUT signal is applied t o INPUT connector and displayed on CRT. The peak of displayed 35-MHz signal is centere...

PERFORMANCE TESTS MODEL PERFORMANCE TESTS 4-22. INPUT ATTENUATOR ACCURACY SPECIFICATION: Step Accuracy dB t o 60 dB): < 1.0 dB per 10-dB step, 0.01 to 18.0 Maximum Cumulative Step Error dB to 60 dB): < 2.4 dB, 0.01 to 18.0 DESCRIPTION: The input attenuator accuracy is tested over the range of ...

PERFORMANCE TESTS PERFORMANCE TESTS MODEL 4.22. INPUT ATTENUATOR ACCURACY (Cont'd) TABLE INPUT ACCURACY I N P U T Setting Step Attenuator Setting Amplitude Deviation Step Attenuator Error (Calibration)" Corrected Deviation I *Attenuations > dial settings are positive Attenuations dial setting...

MODEL PERFORMANCE TESTS PERFORMANCE TESTS 4-23. REFERENCE LEVEL ACCURACY SPECIFICATION: Step Accuracy (steps referenced with dB input attenuation): - 10 t o - 80 0.5 dB Vernier Accuracy: 0.5 dB DESCRIPTION: The reference level accuracy is tested over the range of - 10 t o - 100 by checking the I F g...

PERFORMANCE TESTS PERFORMANCE TESTS MODEL 4-23. REFERENCE LEVEL ACCURACY (Cont'd) PROCEDURE: Step Accuracy in Log Mode Set equipment controls as follows: Spectrum Analyzer: TUNING FREQ 100 kHz RESOLUTION BW 30 kHz, uncoupled INPUTATTEN REFERENCE LEVEL - 10 R E F L E V E L F I N E Amplitude Scale 1 S...

MODEL PERFORMANCE TESTS PERFORMANCE TESTS 4-23. REFERENCE LEVEL ACCURACY (Cont'd) R E F E R E N C E L E V E L Setting Corrected Deviation TABLE 4-10. ACCURACY LOG MODE *Attenuations > dial settings are positive Attenuations dial settings are negative (-). For example, 9.99 dB calibration for a 1 ...

PERFORMANCE TESTS MODEL PERFORMANCE TESTS 4-23. REFERENCE LEVEL ACCURACY (Cont'd) TABLE ACCURACY LINEAR MODE Step Attenuator Setting I Deviation f r o m 6 t h Division Linear Mode R E F E R E N C E L E V E L Setting Bm) -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 (Ref.) Deviation f r o m 6 t h Division...

MODEL PERFORMANCE TESTS P E R F O R M A N C E 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 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

PERFORMANCE TESTS MODEL PERFORMANCE TESTS 4-24. SWEEP ACCURACY SPECIFICATION: There are 20 selectable and calibrated sweep times in a 1-2-5 sequence from 2 t o 10 (excluding 2 . Sweep time accuracy: 10% ( 20% for 5 and 10 DESCRIPTION: For SWEEP control settings of 10 msec and less, the triangle-wave...

PERFORMANCE TESTS MODEL 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 input. 3. Adjust spectrum analyzer TUNING control t o center signal on CRT Set F...

MODEL PERFORMANCE TESTS PERFORMANCE TESTS 4-24. SWEEP ACCURACY (Cont'd) TABLE ACCURACY, 10 MSEC 2 psec 5 psec 10 psec 20 psec 50 psec msec msec msec msec 2 msec 5 msec 10 msec SWEEP Setting 250 kHz 200 kHz 100 kHz 50 kHz 20 kHz 10 kHz 5 kHz 2kHz kHz 500 Hz 200 Hz 100 Hz Function Generator Frequency ...

PERFORMANCE TESTS MODEL PERFORMANCE TESTS 4-24. SWEEP TIME ACCURACY (Cont'd) SWEEPTIME ACCURACY, 20 MSECTHROUGH W E E P Setting 20 msec 50 msec 1 5 10 Sweep Time Minimum Actual Maximum 9.0 40.0 80.0 0.180 0.450 0.90 1.80 4.50 0.220 0.550 1.10 2.20 5.50 se c c se c 1 1.0 60.0 120.0

MODEL PERFORMANCE TESTS PERFORMANCE TESTS 4-25. CALIBRATOR OUTPUT ACCURACY SPECIFICATION: Amplitude: - 10 dB Frequency: 35 MHz 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 AN...

PERFORMANCE TESTS MODEL PERFORMANCE TESTS , 4-26. DISPLAY FIDELITY SPECIFICATION: Log Incremental Accuracy: 0.1 dB per dB from Reference Level Log Maximum Cumulative Error: < 1.5 dB over entire 70-dB range Linear Accuracy; 3% of Reference Level DESCRIPTION: The amplitude of the log display amplif...

PERFORMANCE TESTS MODEL PERFORMANCE TESTS 4-26. DISPLAY FIDELITY (Cont'd) TABLE 4-16. AMPLITUDE LOG DISPLAY ACCURACY A t t e n u a t o r Setting 0 10 20 30 40 50 60 70 D V M Reading Reading minus Corrected D V M Reading* (Ref.) offset recorded in step 2 . Theoretical Reading Theoretical Reading Subt...

MODEL 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). Maxi- mum difference between ad...

PERFORMANCE TESTS MODEL TABLE 4-18. PERFORMANCE TEST RECORD OF 4) Company Model Spectrum Analyzer Serial No. Para. No. Test Description Frequency Span Accuracy 3. 200 MHz FREQ 4. 100 MHz FREQ 5. 50 MHz FREQ 6. 20 MHz FREQ 7. 10 MHz FREQ 8. MHz FREQ 9. 2 MHz FREQ 10. 1 MHz FREQ 1 1. 500 kHz FREQ 14. ...

MODEL Para. No. 4.13. 4. 5. 6. 4-17. PERFORMANCE TESTS TABLE 4-18. PERFORMANCE TEST RECORD (2 OF 4) Test Description Residual FM 6. Peak-to-Peak Variation of Trace Noise Sidebands 6. Noise Sidebands Resolution Bandwidth Accuracy 7. 3 MHz Resolution BW 8. 3 MHz Resolution BW (ALT IF) 9. 1 MHz Resolut...

MODEL ADJUSTMENTS SECTION V ADJUSTMENTS INTRODUCTION 5-2. This section describes the adjustments used t o restore the HP t o its peak operating condition after a repair or t o compensate for changes resulting from component aging. Illustrations showing the appropriate test setups are included in the...

ADJUSTMENTS MODEL 5-13. RELATED ADJUSTMENTS These adjustments should be performed when the troubleshooting information in Section VIII indicates that an adjustable circuit is not operat- ing correctly. Perform the adjustments after repair or replacement of the circuit. The troubleshooting pro- cedur...

MODEL ADJUSTABLECOMPONENTS (1 OF 3) ADJUSTMENTS Adjustment Name GAIN OFFSET 2nd MIXER MATCH z 1 2nd LO FREQUENCY 3 - l o v 6 C 6 F MO DC FM REG O F F SIG ID DPM ZERO 1 ms 5 ms XTL LC C9 C12 CAL FREQ LO ADJ CAL AMPL LC CTR CTR Reference Designator A1 A1 A2 A5 L2 A7 R8 A7 R 4 A7 R47 A7 R7 5 A7 R8 1 A7...

MODEL ADJUSTMENTS TABLE 5-1. ADJUSTABLE COMPONENTS (3 OF 3) Adjustment Name LOG GAIN 1 dB (offset) dB) -12D (-12 dB) 1 B 2B 3B 4B 5B 6B 6C 1 A 2A 3A 4A 5A 6A v 3 + v 3 - v 2 - v 2 + SYM Reference Designator Paragraph Description Adjusts dc offset circuitry at o u t p u t of Log Amplifier Assembly A1...

ADJUSTMENTS MODEL TABLE 5-2. RELATED ADJUSTMENTS or Repaired DPM Display DPM Driver F r o n t Panel Switch Assembly I n p u t Attenuator First Mixer Second Converter YIG-Tuned Oscillator Frequency Control Marker Sweep Generator/ Bandwidth Control Third Converter Bandwidth Filters Step Gain Log Ampli...

ADJUSTMENTS MODEL TABLE 5-4. HP PART NUMBERS OF STANDARD VALUE REPLACEMENT COMPONENTS (1 OF 3) CAPACITORS R A N G E : 1 t o 24 T Y P E : T u b u l a r T O L E R A N C E : 1 t o 9.1 = Value HP Part Number R A N G E : 27 t o 680 T Y P E : Dipped Mica T O L E R A N C E : Value HP Part Number

ADJUSTMENTS MODEL TABLE 5-4. HP PART NUMBERS OF STANDARD VALUE REPLACEMENTCOMPONENTS (3 RESISTORS RANSE: 10 t o O h m s TYPE: F i x e d -F i l m WATTAGE: a t 125°C TOLERANCE: HP Part Number Value HP Part Number Value 6.8 1 K 75 .OK OOK HP Part Number Value HP Part Number

MODEL ADJUSTMENTS ADJUSTMENTS - - 5-17. POWER SUPPLY CHECKS AND ADJUSTMENTS REFERENCE: A7, A9 Schematics DESCRIPTION: The + and - 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 variati...

MODEL ADJUSTMENTS ADJUSTMENTS 5-17. POWER SUPPLY CHECKS AND ADJUSTMENTS (Cont'd) NOTE The two following voltage adjustments, + and VO (Varactor Offset), must be performed while the spectrum analyzer i s still cold (during first five minutes after turn-on). If the instrument has been operating longer...

ADJUSTMENTS ADJUSTMENTS MODEL 5-18. CALIBRATED SWEEP TIME ADJUSTMENT REFERENCE: A9 Schematic DESCRIPTION: A counter is used t o adjust the time interval of the 1 millisecond per division and milliseconds per division sweep times. Calibrated sweep times from 0.1 milliseconds through 50 milliseconds a...

ADJUSTMENTS MODEL ADJUSTMENTS 5-18. CALIBRATED SWEEP TIME ADJUSTMENT NOTE In early instruments, is labeled "2 The adjustment of however, should be performed with SWEEP set at 5 ms. 5 . Set spectrum analyzer SWEEP control t o 5 msec. Readjust counter SENSITIVITY controls as necessary and adjust 5...

MODEL ADJUSTMENTS ADJUSTMENTS 5-19. LOG AMPLIFIER LOG AND LINEAR ADJUSTMENTS REFERENCE: A14 and A1 5 Schematics DESCRIPTION: Step attenuators are used t o change the level of the input signal to the spectrum analyzer in calibrated steps. The output of Vertical Driver and Blanking Assembly A15 is mon...

ADJUSTMENTS MODEL ADJUSTMENTS 5-19. LOG AMPLIFIER LOG AND LINEAR ADJUSTMENTS (Cont'd) TABLE LOG FIDELITY CHECK Test Limits Step Attenuator Setting Theoretical Reading Theoretical Reading Subtracted f r o m Corrected D V M Reading D V M * DVM reading m i n u s o f f s e t r e c o r d e d in s t e p 4...

MODEL ADJUSTMENTS ADJUSTMENTS 5-19. LOG AMPLIFIER LOG AND LINEAR ADJUSTMENTS (Cont'd) Linear Output and Linear Step Gain 20. Disconnect from step attenuator and reconnect t o When reconnecting to do not tighten to over 6 inch pounds of torque; can be damaged if the connector is overtightened. Set sp...

ADJUSTMENTS MODEL ADJUSTMENTS 5-19. LOG AMPLIFIER LOG AND LINEAR ADJUSTMENTS (Cont'd) Log Gain 24. Set spectrum analyzer controls as follows: REFERENCE LEVEL - 50 25. Set 10-dB step attenuator t o dB. Retune spectrum analyzer t o peak signal. Adjust signal generator OUTPUT LEVEL for DVM reading 1 of...

MODEL ADJUSTMENTS ADJUSTMENTS 5-19. LOG AMPLIFIER LOG AND LINEAR ADJUSTMENTS (Cont'd) TABLE LOG AMPLIFIER OUTPUT LIMITS Step Attenuator Setting D V M Reading Corrected D V M Reading* Test Limits Theoretical Reading Theoretical Reading Subtracted f r o m Corrected D V M Reading * DVM Reading minus o ...

ADJUSTMENTS ADJUSTMENTS MODEL 5-20. OFFSET ADJUSTMENT REFERENCE: A 15 Schematic DESCRIPTION: Reference is set in 10 amplitude scale and 1 dB offset is adjusted in 1 for the same full display reference. D l S P L A Y SPECTRUM A N A L Y Z E R EXTENDER CABLE ASSEMBLY NPUT OUTPUT A D A P T E R FIGURE 1-...

MODEL ADJUSTMENTS ADJUSTMENTS 5-20. 1-dB OFFSET ADJUSTMENT (Cont'd) 2. Connect equipment as shown in Figure 5-4. 3 . Adjust vertical position t o 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 trac...

ADJUSTMENTS MODEL ADJUSTMENTS 5-21. BANDWIDTH FILTER ADJUSTMENTS REFERENCE: A9, 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 Control Assembly A9 (paragraph 5-22). D I S P L A Y SP...

MODEL ADJUSTMENTS ADJUSTMENTS 5-21. BANDWIDTH FILTER ADJUSTMENTS T E R M I N A L CONNECTORS FIGURE CRYSTAL SHORT CONFIGURATION PROCEDURE: NOTE Allow 30 minutes time before performing adjustments. 1 . Set spectrum analyzer controls as follows: FREQUENCYBAND TUNING RESOLUTIONBW INPUTATTEN REFERENCELEV...

ADJUSTMENTS MODEL ADJUSTMENTS 5-21. BANDWIDTH FILTER ADJUSTMENTS LC Alignment Accidentally shorting the case of (directly below to ANY test point will cause catastrophic failure to Sweep Generator Assembly 24. Set RESOLUTION BW control to 100 kHz. Jumper t o This forces the BW7 line to + Set FREQ t ...

MODEL ADJUSTMENTS ADJUSTMENTS 5-22. 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 settin...

MODEL 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 tw...

ADJUSTMENTS ADJUSTMENTS MODEL 5-23. R F ADJUSTMENT REFERENCE: A12 Schematic DESCRIPTION: The RF gain (sensitivity) of Step Gain Assembly A12 is adjusted by injecting a 21.4 MHz signal at Third Converter Assembly A10 is removed and replaced with a special extender board for applying the 21.4 MHz sign...

MODEL ADJUSTMENTS ADJUSTMENTS 5-24. STEP ADJUSTMENTS REFERENCE: A12 Schematic DESCRIPTION: REF LEVEL FINE, dB, and - 12 dB adjustments are properly set and step gains of 10 dB, 20 dB, and 40 dB are adjusted. S I G N A L GENERATOR . D I G I T A L VOLTMETER NPUT D l SPLAY ATTENUATOR OUTPUT STEP ATTENU...

MODEL ADJUSTMENTS ADJUSTMENTS 5-24. STEP 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 40 D adjustment for signal level one division from top graticule line. 17. Check REF L...

MODEL ADJUSTMENTS ADJUSTMENTS 5-25. FIRST CONVERTER ADJUSTMENTS (Cont'd) First LO Adjustments 2. Connect DVM to TUNE. 3. Set spectrum analyzer controls as follows: INPUT dB FREQ ALTIF OFF 4. Connect frequency counter t o spectrum analyzer RF Input. 5. Jumper DIODE BIAS t o ground. is located on the ...

ADJUSTMENTS MODEL ADJUSTMENTS 5-25. FIRST CONVERTER ADJUSTMENTS (Cont'd) Alternate IF First LO Shift Check 15. Press front-panel ALT I F pushbutton IN t o activate alternate 16. Verify YTO frequency shift according to Table 5-12. F R E Q U E N C Y B A N D 17. Remove jumper from DIODE BIAS to ground....

MODEL ADJUSTMENTS ADJUSTMENTS 5-25. FIRST CONVERTER ADJUSTMENTS (Cont'd) Adjust front-panel TUNING FINE control t o place a comb tooth on the first vertical graticule line of the CRT display. Adjust FM to place a comb tooth on the ninth vertical graticule line of the CRT display. Switch to 10 kHz RE...

MODEL ADJUSTMENTS ADJUSTMENTS 5-26. SECOND CONVERTER ADJUSTMENTS REFERENCE: A3, A4, 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 disp...

ADJUSTMENTS MODEL 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 t o 2nd LO output using the test cable and two...

ADJUSTMENTS ADJUSTMENTS MODEL 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 filter is aligned by injecting a frequency modulated 321.4 MHz signal at the necessary level and m...

MODEL ADJUSTMENTS ADJUSTMENTS 5-27. THIRD CONVERTER ADJUSTMENTS (Cont'd) PROCEDURE: 1. Allow hour time of equipment with analyzer connected t o mainframe with extender cable. Third LO Adjustment 2. Connect frequency counter t o 300 M H z output using the BNC t o SMB test cable. 3. Adjust LO f o r fr...

MODEL ADJUSTMENTS ADJUSTMENTS 5-28. FREQUENCY RESPONSE ADJUSTMENTS REFERENCE: A3, A4, A6, and A12 Schematics NOTE Perform CAL OUTPUT and REF LEVEL CAL adjustments before pro- ceeding with frequency response adjustments. DESCRIPTION: Frequency Response (flatness) is adjusted in six parts correspondin...

ADJUSTMENTS MODEL ADJUSTMENTS 5-28. FREQUENCY RESPONSE ADJUSTMENTS (Cont'd) F R O M ANALYZER 4 R E F E R E N C E D E S I G N A T O R J 1 R2 R3 R 4 R5 R6 R7 R8 u 1 + I O K TO + PROGRAMMING R 7 5 K H P P A R T N U M B E R I D E S C R I P T I O N DIODE-SWITCHING 30V 5 0 MA 2NS CONNECTOR-RF BNC FEMALE 5...

ADJUSTMENTS MODEL ADJUSTMENTS 5-28. FREQUENCY RESPONSE ADJUSTMENTS (Cont'd) 5 . Set spectrum analyzer controls as follows: R E F LEVEL FINE - 2 0 I N P U T A T T E N Amplitude Scale 10 FREQ F (full) RESOLUTIONBW TRIGGER B L C L I P O F F VIDEOFILTER MIN A L T I F O F F S I G I D E N T O F F TUNING 3...

ADJUSTMENTS MODEL ADJUSTMENTS 5-28. FREQUENCY RESPONSE ADJUSTMENTS 26. Adjust Tuning Voltage Circuit GAIN and OFFSET controls to phase-lock swept signal from 2 t o 3 27. Adjust RF plug-in POWER LEVEL control t o place trace at approximately - 27 on CRT. 28. Change spectrum analyzer Amplitude Scale t...

MODEL ADJUSTMENTS ADJUSTMENTS 5-28. FREQUENCY RESPONSE ADJUSTMENTS 57. Change spectrum analyzer Amplitude Scale t o 1 58. Adjust V3 - (bias), 5A (offset), 5B (tilt), and (breakpoint) for best overall flatness of trace from 6 t o 15 with trace approximately centered about the sixth horizontal graticu...

ADJUSTMENTS MODEL ADJUSTMENTS 5-29. CAL OUTPUT AND REF LEVEL CAL ADJUSTMENTS NOTE These adjustments should be followed by frequency response adjustments, since adiustment of (offset) will shift the freauencv of Band 1 - 3 REFERENCE: A10 and A12 Schematics DESCRIPTION: The 35 MHz CAL OUTPUT signal is...

MODEL ADJUSTMENTS ADJUSTMENTS 5-29. CAL OUTPUT AND REF LEVEL CAL ADJUSTMENTS (Cont'd) PROCEDURE: CAL OUTPUT Adjustment 1. Allow one-half hour time of equipment with spectrum analyzer connected t o mainframe with extender cable. 2. Connect power sensor t o front-panel CAL OUTPUT connector as shown in...

ADJUSTMENTS MODEL 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 and LIN while adjusting (offset) t o place signal peak at same level in both 10 and LIN. 17. Level a...

MODEL ADJUSTMENTS ADJUSTMENTS 5-30. FREQUENCY DISPLAY ADJUSTMENTS REFERENCE: 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. V O L T M E T E R D l S P L A Y I N P...

MODEL REPLACEABLE PARTS SECTION REPLACEABLE PARTS INTRODUCTION The replaceable parts list breakdown for each 6-5. The following information is listed for each part: 1. The Hewlett-Packard part number. major assembly is in Section VIII, following the circuit description for the assembly. This section...

REPLACEABLE PARTS MODEL TABLE REFERENCE DESIGNATIONS AND ABBREVIATIONS (1 OF 3) REFERENCE DESIGNATIONS Assembly . . . . . . . . . . . . . . . . . . . . . . . . Attenuator, Isolator, . . . . . . . . . . . . . . Limiter, Termination . . . . . . . . . . . . . . . . . . . . . . Battery . . . . . . . . ....

REPLACEABLE PARTS MODEL TABLE REFERENCE DESIGNATIONS AND ABBREVIATIONS (3 OF 3) TABLEG-2. MANUFACTURERS CODE M U L T I P L I E R S Mfr. No. Abbreviation Prefix Multiple T tera G M mega kilo da deka 1 0 d deci c centi Manufacturer Name Abbreviation Prefix Multiple m 1 micro 1 n 1 P f femto a ALLEN-BR...

Page 1-3: Table HP Specifications o f Below Change " R e s i d u a l s p e c i f i c a t i o n t o r e a d a s f o l l o w s : l e s s t h a n 1 kHz p-p f o r a t i m e 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 l i n e v o l t a g e s ; l e s s t h a n 2 kHz p-p, l i n e v o l t a g ...

/- Pages 4-10 and 4-11: Paragraph 4-13. Residual Below Change SPECIFICATION t o r e a d a s f o l l o w s : L e s s t h a n 1 kHz peak- to- peak f o r a t i m e i n t e r v a l 0.1 s e c o n d ; 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 s e r i e s d i s p l a y m a i n f ...

Page 4-63: Table 4-18. Performance Test Record of Below Para. No. 4-13. Residual change t h e maximum Peak Variation o f Trace in test 6 to 0.7

Pages 5-11 through 5-13: Paragraph 5-17. Power Supply Checks and Adjustments Below R e p l a c e P a r a g r a p h 5-17 w i t h new P a r a g r a p h 5-17 (SERIAL PREFIX i n c l u d e d i n t h i s Manual B a c k d a t i n g s u p p l e m e n t .

/-- ADJUSTMENTS 5-17. POWER SUPPLY CHECKS AND ADJUSTMENTS (SERIAL PREFIX REFERENCE: A7, A9 Schematics DESCRIPTION: The + and - supplies on Frequency Control Assembly A7 are adjusted. The - supply on A7 is checked for proper dc output with less than 50 variation when tuning the H P from to 3 The + su...

Pages 5-17 through 5-23: Paragraph 5-19, Log Amplifier and Linear Adjustments Below R e p l a c e P a r a g r a p h 5-19 w i t h new P a r a g r a p h 5-19 (SERIAL PREFIX i n c l u d e d i n t h i s Manual B a c k d a t i n g s u p p l e m e n t .

ADJUSTMENTS 5.19. LOG AMPLIFIER LOG AND LINEAR ADJUSTMENT (SERIAL PREFIX REFERENCE: A14 and A15 Schematics DESCRIPTION: 10 and LIN are adjusted for correct steps and full-screen display translations. DISPLAY DIGITAL VOLTMETER SIGNAL GENERATOR F UTPUT ATTENUATOR FIGURE LOG AMPLIFIER LOG AND LINEAR AD...

ADJUSTMENTS 5-19. LOG AMPLIFIER LOG AND LINEAR ADJUSTMENT (SERIAL PREFIX Connect equipment as shown in Figure 5-3. Set signal generator frequency to 321.4 MHz and output level to - 40 Remove from A5 J2 2nd CONV OUT. Connect signal generator output through step attenuator and adapters to . Set the TE...

ADJUSTMENTS 5-19. LOG AMPLIFIER LOG AND LINEAR ADJUSTMENT (SERIAL PREFIX 12. Set step attenuator t o dB. Digital voltmeter should indicate 800 plus offset (algebraic sum) 1 If DVM reading is not within limits, adjust LOG LIN adjustment for a digital voltmeter reading of 800 plus offset minus 50 perc...

ADJUSTMENTS LOG AMPLIFIER LOG AND LINEAR ADJUSTMENT (SERIAL PREFIX (Cont'd) Set output level of signal generator for a digital voltmeter reading of 800 plus offset (algebraic sum) Set Amplitude Scale to 10 and adjust LOG LIN adjustment for a digital voltmeter reading of 800 plus offset. Repeat step ...

Pages 5 - 2 6 t h r o u g h 5-32: P a r a g r a p h 5 - 2 1 . F i l t e r A d j u s t m e n t s Below R e p l a c e P a r a g r a p h 5-21 w i t h new Paragraph 5-21 (SERIAL PREFIX i n c l u d e d i n t h i s Manual B a c k d a t i n g s u p p l e m e n t .

ADJUSTMENTS BANDWIDTH FILTER ADJUSTMENTS (SERIAL PREFIX REFERENCE: A and A1 3 Schematics DESCRIPTION: The crystal and LC bandwidth filter circuits are adjusted for symmetry, center, and peak. bandwidths are adjusted in Sweep Control Assembly A9 (paragraph 5-22). DISPLAY EXTENDER CABLE ASSEMBLY SPECT...

ADJUSTMENTS 5-21. BANDWIDTH FILTER ADJUSTMENTS (SERIAL PREFIX (Cont'd) 11. Set t o 20 kHz, RESOLUTION BW t o 30 kHz, and SWEEP t o 10 NOTE A non-metallic tuning tool is required for adjustments on Bandwidth Filter Assemblies A1 1 and A1 3. 12. Connect crystal shorts (through cover access holes) acro...

ADJUSTMENTS 5-21. BANDWIDTH FILTER ADJUSTMENTS (SERIAL PREFIX (Cont'd) 16. Adjust SYM and CTR for a centered and symmetrical bandpass. Adjust for minimum signal amplitude, 17. Remove crystal short from 18. Adjust SYM and CTR for a centered and symmetrical bandpass. Adjust for minimum signal amplitud...

ADJUSTMENTS 5-21. BANDWIDTH FILTER ADJUSTMENTS (SERIAL PREFIX (Cont'd) 23. Carefully center signal on CRT in 30 kHz RESOLUTION then switch RESOLUTION BW to 100 kHz. Note where signal intersects the center vertical graticule line. 24. Adjust LC CTR for maximum signal amplitude where the signal inters...

Pages 5-33 through Paragraph 5-22. dB Bandwidth Below R e p l a c e Paragraph 5-22 w i t h new Paragraph 5-22 (SERIAL PREFIX i n c l u d e d i n t h i s Manual B a c k d a t i n g s u p p l e m e n t .

ADJUSTMENTS /-- 5-22. 3 dB BANDWIDTH ADJUSTMENTS (SERIAL PREFIX REFERENCE: A9 Schematic DESCRIPTION: The 3-dB bandwidths for the 3 MHz, 1 MHz and 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 sett...

P a g e s 5-44 through 5-48: Paragraph 5-25. F i r s t Converter Ad Below R e p l a c e Paragraph 5-25 w i t h new Paragraph 5-25 (SERIAL PREFIX i n c l u d e d i n t h i s Manual B a c k d a t i n g s u p p l e m e n t . Below D e l e t e s t e p s 28 t h r o u g h 3 7 .

ADJUSTMENTS 5-25. FIRST CONVERTER ADJUSTMENTS (SERIAL PREFIX REFERENCE: and A7 Schematics DESCRIPTION: The First LO (A6 YTO) is adjusted by monitoring the output at the input connector (LO feedthrough) and the tuning voltage (TUNE) output of the A7 Frequency Control board and adjusting the low-end f...

ADJUSTMENTS 5-25. FIRST CONVERTER ADJUSTMENTS (SERIAL PREFIX (Cont'd) Connect frequency counter to analyzer Input. Jumper DIODE BIAS to Ground. is located on the Motherboard through a hole in the analyzer side frame. Adjust front-panel TUNING control for DVM indication of Vdc (fully counterclockwise...

ADJUSTMENTS /'- 5-25. FIRST CONVERTER ADJUSTMENTS (SERIAL PREFIX (Cont'd) FM Driver Adjustment 18. Disconnect frequency counter from analyzer RF Input and connect comb generator t o RF Input, 19. Set comb generator for 1 MHz comb teeth. Set analyzer controls as follows: ................................

DIGITAL PANEL METER ASSEMBLY REPLACEABLE PARTS (SERIAL PREFIX Reference Designation HP Part Number Description FREQUENCY D I S P L A Y Y D I S P L A Y D I S P L A Y SCG I - C H A R AY 1 D I S P L A Y - N U H 1-CHAR 1 CHAR 1-CHAR SOCKET D I P D I P SLDR D I P D I P DR 1 0 CONT D I P D I P S O C K F T...

DPM D R I V E R OFFSET DPM DISPLAY FIGURE 85. DIGITAL PANEL METER ASSEMBLY Al, COMPONENT LOCATIONS (SERIAL PREFIX

/- Pages 8-25 through W I T C H A2 Figure 8-10. Front Assembly Exploded View Below D e l e t e F i g u r e 8- 10. Add HP P a r t Number Check D i g i t PLATE LEVEL, Below POT Table Front Switch Board Assembly Replaceable Parts Below R e p l a c e T a b l e 8-2 w i t h new T a b l e 8-2 (SERIAL PREFI...

TABLE FRONT SWITCH BOARD ASSEMBLY REPLACEABLE PARTS (2 OF 2) (SERIAL PREFIX Reference Designation HP Part Number Description 5 4 , ROTOR SPR CC'R 5 4 , CPR SPR PARTS T I N I D L K N O . 4 I N I D T 1 / 4 I N I N - I D 1 / 4 I D I N OD LK 8 2 E X T T NO. 4 MACH 4 4 0 I N L G PAN 4 - 4 0 P A N : I D -...

Pages 8-51 through OSCILLATOR A6 Table 8-3. Section, Replaceable Parts Below Add HP P a r t Number 08559-20041, Check D i g i t 7 , COVER, 2ND L.O. Under M i s c e l l a n e o u s 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. D e l e t e HP P a r t Number 2200...

Pages 8-67 through 8-81/8-82: A 7 Table Frequency Control Assembly Replaceable Parts Below R e p l a c e T a b l e 8-4 w i t h new T a b l e 8-4 (SERIAL PREFIX i n c l u d e d i n t h i s Manual B a c k d a t i n g s u p p l e m e n t . Below Make t h e f o l l o w i n g c h a n g e s t o new T a b ...

TABLE FREQUENCY CONTROL ASSEMBLY A7, REPLACEABLE PARTS (2 OF 3) (SERIAL PREFIX Designation HP Part Number Description R E S I S T O R 1 0 0 1 3 3 1 2 U PW 5 % W W 1 TRN R E S I S T O R F RESISTOR R E S I S T O R F 1 0 0 IOOK F R E S I S T O R 1 % F R E S I S T O R F R E S I S T O R R E S I S T O R -...

TABLE FREQUENCY CONTROL ASSEMBLY A7, REPLACEABLE PARTS (3 OF 3) (SERIAL PREFIX Reference Designation HP Part Number Description CONNFCTOR P I N 1 . 1 4 5 7 SO A7 P A R T S MACH C P A N MACH 4 4 0 I N - I PAN Mfr Part Number See introduction t o this section for ordering information *Indicates factor...

A7 FREQUENCYCONTROL FIGURE 828. FREQUENCY CONTROL ASSEMBLY A7, COMPONENT LOCATIONS PREFIX

Table Assembly Replaceable P a r t s Below Change A 8 t o HP P a r t Number 08559-60022, Check D i g i t 8. D e l e t e Change t o HP P a r t Number Check D i g i t 3, RESISTOR F Change t o HP P a r t Number 0757-0466, Check D i g i t 7 , RESISTOR 1 % F Add HP P a r t Number Check D i g i t 3, RESIS...

Figure 8-33. Assembly A8, Schematic Diagram of Below Change A 8 t o HP P a r t Number 08559-60022. R e p l a c e f u n c t i o n b l o c k o f F i g u r e 8-33 w i t h new P/O F i g u r e 3 3 ( 1 o f (SERIAL PREFIX i n c l u d e d i n t h i s Manual B a c k d a t i n g s u p p l e m e n t . Below Ma...

A8 MARKER R 6 1 DPM ZERO FIGURE MARKER ASSEMBLY COMPONENT LOCATIONS (SERIAL PREFIX

+ 5 V POWER SUPPLY FIGURE 8-33. MARKER ASSEMBLY SCHEMATIC DIAGRAM OF 2) (SERIAL PREFIX SIC I D OFF 4.11 , R 3 9 FIGURE 8-33. MARKER ASSEMBLY SCHEMATIC DIAGRAM (2 OF 2) (SERIAL PREFIX

Pages 8-97 through A9 Table Sweep Control Assembly Replaceable Parts Below Change t o HP P a r t Number Check D i g i t Change t o HP P a r t Number 0160-2055, Check D i g i t 9 , CAPACITOR-FXD C E R . Change t o HP P a r t Number 0160-0153, Check D i g i t 4, CAPACITOR-FXD Change and t o HP P a r t...

TABLE 86. SWEEP CONTROL ASSEMBLY REPLACEABLE PARTS (1 OF 4) (SERIAL PREFIX Reference HP Part Number Description W E E P CONTROL C A P A C I T O R - F X D C A P A C I T O R - F X D C A P A C I T O R - F X D + - 5 % MET-POLYC C A P A C I T O R - F X D M I C A CAPACITOR- FXD CAPACITOR- FXD CER CAPACITO...

TABLE CONTROL ASSEMBLY REPLACEABLE PARTS (4 OF 4) (SERIAL PREFIX Reference Designation HP Part Number Description P I N I C UP AMP L P P K G AMP TO - 9 9 AMP 0 - T O 9 9 PKG 7NR 5 % D O - 3 5 P D DO 3 5 PD= 4W 5% DO - 3 5 P D - . 4 W A 9 I. P A R T S SCREW-NACH 4 - 4 0 , 3 7 5 - I N - L C Mfr Code 1...

A9 SWEEP CONTROL FIGURE 839. SWEEP CONTROL ASSEMBLY COMPONENT LOCATIONS (SERIAL PREFIX

321.4 MHz 321.4 MHz BPF ADJUST THIRD CONVERTER C l l 300 MHz LO OUT (TEST CONNECTOR) LO ADJ , R13 CAL AMPL CAL FREO FIGURE CONVERTER ASSEMBLY COMPONENT LOCATIONS (SERIAL PREFIX

POWER SUPPLIES PI- 24 PI-23 - 6VF FIGURE CONVERTER ASSEMBLY SCHEMATIC DIAGRAM (SERIAL PREFIX

@ F I R S T LC POLE L C DIP 2 2 R19 + I O V F NOTE R 3 2 R 4 4 6 4 K IOK R 2 6 + I O V F LC ( F E E D B A C K ) FIGURE BANDWIDTH FILTER NO. 1 ASSEMBLY A l l , SCHEMATIC DIAGRAM (SERIAL PREFIX

Pages 8-143 through STEP A12 Table 8-10. Step Gain Assembly Replaceable P a r t s & Below D e l e t e a n d Figure 8-60. Step Gain Assembly Schematic Diagram Below I n f u n c t i o n b l o c k d e l e t e C 4 0 . I n f u n c t i o n b l o c k d e l e t e C 4 1 . I n f u n c t i o n b l o c k d ...

FIRST LC P O L E FEEDBACK) BANDWIDTH FILTER NO. A13, SCHEMATIC DIAGRAM (SERIAL PREFIX

TABLE 812. LOG AMPLIFIER ASSEMBLY A14, REPLACEABLE PARTS (1 OF 4) (SERIAL PREFIX Reference Designation HP Part Number Description LOG A M P L I F I E R C A P A C I T O R - F X D C A P A C I T O R + - 2 0 % C A P A C I T O R - F X D I O O V D C CER C A P A C I T O R + - 2 0 % OOVDC CER C A P A C I T ...

Reference Designation TABLE 812. LOG AMPLIFIER ASSEMBLY A14, REPLACEABLE PARTS (3 OF 4) (SERIAL HP Part Number Description TRANSISTOR NPN S I TO-18 TRANSISTOR PNP TRANSISTOR NPN TRANSISTOR NPN S I TRANSISTOR NPN S I TO- 5 RESISTOR-TRHR C 17-TRN RESISTOR-TRHR C SIDE- ADJ 17-TRN RESISTOR-TRHR 2K C S I...

TABLE 812. LOG AMPLIFIER ASSEMBLY A14, REPLACEABLE PARTS (4 OF4) (SERIAL PREFIX Reference HP Part Number Description RESISTOR 3 1 6 RESISTOR 6 . 1 9 1 F NOT ASSIGNED RESISTOR F 1 % F 1 % F RESISTOR 1 % F RESISTOR F RESISTOR 1 0 F RESISTOR 1 % F RESISTOR 1 2 1 1 % F RESISTOR F 6 1 9 1 % RESISTOR 1 % ...

Pages 8-191 and MOTHERBOARD A16 Table 4. Motherboard Assembly 6, Replaceable P a r t s Below Change A16 t o HP P a r t Number 08559- 60066, Check D i g i t Change and t o HP P a r t Number 0160- 2055, Check D i g i t CAPACITOR-FXD . C E R . Change t o HP P a r t Number 0180- 2154, Check D i g i t 1 ...

D I O D E B I A S A16 MOTHERBOARD R 4 E X T H O R I Z G A I N I 0 FIGURE 8-76. MOTHERBOARD ASSEMBLY COMPONENT LOCATIONS (SERIAL PREFIX

MODEL SECTION SERVICE SERVICE INTRODUCTION the listed instrument is not available, another ment that meets the required minimum specifications 8-2. This section provides instructions for trouble- may be substituted. shooting and repairing the HP Model Spec- trum Analyzer. It includes circuit descrip...

SERVICE MODEL 8-12. Printed Circuit Board Edge Connector Contact Cleaning MATERIALS: Lint-free cloth o r equivalent ( H P P a r t Number 93 Check Digit 3). Solution of 80% electronics-grade isopropyl alcohol and 20% water. Static-free work station. PROCEDURE: Dampen the cloth with the alcohol and wa...

MODEL SERVICE SYMBOLS USED I N SCHEMATICS AND BLOCK DIAGRAMS BASIC COMPONENT SYMBOLS Variable Resistor: Clockwise r o t a t i o n o f shaft wiper towards end of resistor mark- ed CW. Light-emitting d i o d e T r a n s i s t o r , P N P Electrolytic c a p a c i t o r Variable c a p a c i t o r Transi...

SERVICE MODEL SYMBOLS USED I N SCHEMATICS AND BLOCK DIAGRAMS BASIC COMPONENT SYMBOLS Connection symbol indicating a J a c k (except f o r P C b o a r d edge connectors) Connection symbol indicating a Plug (except f o r PC b o a r d edge connectors) Test P o i n t : Terminal provided f o r test probe...

MODEL SERVICE SYMBOLS USED I N SCHEMATIC AND BLOCK DIAGRAMS BASIC LOGIC SYMBOLS Distinctive-Shape Symbols O u t p u t is active when i n p u t is active. SCHMITT T R I G G E R A N D F U N C T I O N O R F U N C T I O N E X C L U S I V E - O R F U N C T I O N W I R E D A N D F U N C T I O N W I R E D ...

MODEL SERVICE Nominal power levels, voltages, and waveforms shown o n schematic diagrams were measured using the test setup shown below. Note that signal characteristics shown on schematic diagrams are pro- vided as a troubleshooting aid only. They should not be used for making instrument adjustment...

SERVICE MODEL PROCEDURE: Set H P Spectrum Analyzer controls as follows: TUNING FREQ M H z RESOLUTION BW 300 k H z I N P U T dB REFERENCE LEVEL - 10 REFERENCE LEVEL FINE Amplitude Scale S W E E P AUTO S W E E P TRIGGER F R E E RUN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

MODEL SERVICE THE HP SPECTRUM ANALYZER THEORY OF OPERATION General Information The H P is a 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 t o 21 and displays frequency spans as wide as 9 (in bands 5 and 6) and as narrow a...

SERVICE MODEL holes, i n the aluminum block housing t o 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 L O produces the second I F a t MHz. The need f o r operating the...

MODEL 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 t o produce a response. It is possible t o be in the 1 - band and have a signal at 5 produce a response a t 2 the...

MODEL TROUBLESHOOTING HINTS Begin troubleshooting by measuring the mainframe-supplied voltages as close t o the H P as possible. The Vertical Assembly A15 offers three test points t o make the measurements. The + supply is available at the + supply at and the - supply at If any of these voltages are...

MODEL SERVICE DPM Accuracy The following is a guide t o troubleshooting poor DPM accuracy. Further information is included following the circuit descriptions of the indicated assemblies. Check + supply on the Frequency Control Assembly A7 Perform and verify Frequency Display Adjustment (Paragraph 5-...

MODEL SERVICE DIGITAL PANEL METER ASSEMBLY A l , CIRCUIT DESCRIPTION The Digital Panel Meter (DPM) Assembly is a dc voltmeter that measures a tuning voltage from Marker Assembly A8, and converts it t o a front-panel frequency readout. The DPM electronics are contained o n two assemblies: the DPM Dis...

SERVICE MODEL 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 t o U4 where it is converted t o a seven-line (segment) drive. This seven-line output from...

SERVICE FRONT SWITCH ASSEMBLY A2, 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.

MODEL SERVICE 14. Disconnect 10-conductor ribbon cable connected t o DPM Driver Assembly Remove screw holding DPM Display Assembly t o DPM window will fall out. 15. Use a nut driver t o remove the two nuts attaching front panel t o Front Switch (1). Remove front panel from Front Switch 16. Place Fro...

MODEL SERVICE 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 ...

SERVICE MODEL 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 t o one side o f drive hub; place drive hub over right-most bushing in Front Switch with ...

MODEL SERVICE Use a no. 4 hex wrench t o temporarily install SWEEP TRIGGER, SWEEP MANUAL SWEEP, and FREQ knobs. j. Tighten Stud (53) and left-most Screw (48) attaching Front Switch Board Assembly t o Front Switch (1). Check all switch rotors for smooth, free switch action. Readjust position of Front...

SERVICE MODEL k. Pull and turn FREQ Knob until a set screw is visible on Coupling H u b (54). Push FREQ knob in and out t o align pin on Coupling H u b with slots in Bandwidth Rotor (56). With FREQ knob pushed in and Coupling H u b flush again Bandwidth Rotor (pin aligned), tighten set screw using a...

SERVICE MODEL 8. Installation of Knobs: a. Turn SWEEP TRIGGER Shaft (24) fully clockwise (as seen from front of Front Switch Assembly) t o spring-loaded SINGLE position and release. Use a no. 4 hex wrench t o install SWEEP TRIGGER knob with SINGLE line aligned with painted arrow on front panel. Chec...

MODEL SERVICE INSTALLATION OF FRONT SWITCH ASSEMBLY INTO HP CHASSIS 9. Set Front Switch Assembly into place in chassis, being careful not t o bend semi-rigid cables or pinch wires or ribbon cables. Attach Front Switch (1) to left and right side gussets with four screws. 10. Connect four wires (0,916...

MODEL L16 MOTHERBOARD RIBBON CABLE ASSEMBLY RIBBON CABLE ASSEMBLY DPM DRIVER PC BOARD. I. ARE SHOWN AS SEEN FROM TOP OF (FRONT O F REAR SWITCH BOARD ASSEMBLY). NOTE THAT CONTACTS AND 14 ARE NOT USED. ALSO THAT PIN NUMBERS MOLDED ONTO PLUG DO NOT NECESSARILY CORRESPOND CONTACT NUMBERS. ARE SHOWN AS S...

MODEL SERVICE RF SECTION CIRCUIT DESCRIPTIONS List of parts included in R F Section. INPUT ATTENUATOR ASSEMBLY A3, CIRCUIT DESCRIPTION The H P Input Attenuator Assembly A3 is a 50 ohm, precision, coaxial step attenuator. Attenuation in 10-dB steps from dB t o 70 dB is accomplished by switching the s...

MODEL OSCILLATOR 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 t o establish the oscillator and amplifier bias, as well as protect the bia...

MODEL SERVICE Number 86290-60005 Description Connector Assy (Type N) Body: RF Connector (Type N) Contact: R F Connector (Type N) Insulator Center Conductor Body: Bulkhead Washer: Lock 0.439" ID Nut: Hex 7/16-28 Insulator M f r . Code 28480 02660 02660 28480 28480 28480 OOOOJ OOOOJ 28480 M f r . ...

MODEL SERVICE 2ND CONVERTER V A INPUT J l ( U N D E R N E A T H ) INPUT COUPLING LOOP L 3 C A V I T Y B L O C K MP2 c SECOND CONVERTER F I L T E R ASSEMBLY VARACTO 1 V TO 28V FIGURE SECOND CONVERTER ASSEMBLY A5, COMPONENT LOCATIONS (2 OF 2) 8-61

MODEL SERVICE - - - - - I N P U T A T T E N U A T O R I M I XER f - - - A6 Y I G T U N E D I I FIGURE RF SECTION, BLOCK DIAGRAM

MODEL SERVICE FREQUENCY CONTROL ASSEMBLY A7, CIRCUIT DESCRIPTION The Frequency Control Assembly A7 drives the YIG-Tuned Oscillator Assembly A6 and provides the regulated + and - supplies t o the First Mixer Assembly A4, the Second Converter Assembly and the Marker Assembly Inputs t o the Frequency C...

SERVICE MODEL Resistor R92 is a n 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, and potentiometer R83, the delay compensation adjustment. YTO Main Coil Fixed Driver (F) This...

MODEL SERVICE RESIDUAL FM TROUBLESHOOTING FLOWCHART ANNOTATION I n the next steps, edge connector contacts on the circuit board are taped over t o isolate portions of the circuit. After completing a step where taping i s necessary, remove the tape and clean the circuit board edge contacts with an 80...

SERVICE MODEL A7 FREQUENCY CONTROL ASSEMBLY \ T U N E Y T O FIGURE 8-28. FREQUENCY CONTROL ASSEMBLY A7, COMPONENT LOCATIONS

MODEL SERVICE MARKER ASSEMBLY A8, CIRCUIT DESCRIPTION The Marker Assembly A8 comprises the Marker Generator, the D P M and Second LO Drivers, the ALT I F and SIG IDENT circuits, the A u t o Scan Time Drivers, and the Scan Attenuators. Marker Generator (F) The Marker Generator is basically a zero vol...

SERVICE MODEL Second LO Driver (E) The Second LO Driver varies the voltage applied t o the varactors in the second LO cavity and The upper limit o f this voltage is dependent o n the second LO sensitivity and varies during operation from about I V t o between 7V and An increase in the drive voltage ...

MODEL SERVICE Auto Scan Time (AST) Accuracy: Observe front panel switch positions t o isolate the problem area. Auto scan time can also be affected by circuits on the Sweep Control Assembly A9 and the VIDEO FILTER control position. If the AST problem is band-related, the Marker Assembly A8 is the mo...

MODEL SERVICE Reference Designation HP Part Number TABLE 8-5. MARKER ASSEMBLY REPLACEABLE PARTS (3 3) Description M f r Code M f r Part Number

SERVICE MODEL A 8 M A R K E R ASSEMBLY FIGURE MARKER ASSEMBLY A8, COMPONENT LOCATIONS

SERVICE MODEL AMPL F E R RETRACE SWEEP FIGURE 8-34. SIMPLIFIED SCHEMATIC OF SWEEP GENERATOR I N AUTO MODE With o f f , the current source begins charging the timing capacitor (C3 and C4, block I). A s the timing capacitor charges, the output o f the buffer amplifier increases linearly. Transistor 4 ...

MODEL SERVICE SW TCH I D E A D SWITCH I I 8-35. SIMPLIFIED SCHEMATIC OF SWEEP TIME OPERATION Sweep Time Operation Timing capacitors C3 and C4 provide fast and slow sweep operation (refer t o Figure 8-35). When a sweep time less than or equal t o 1 millisecond per division is selected with the SWEEP ...

SERVICE MODEL Pulse Shaper (M) The pulse shaper circuit (block M) consists of an FET switch, a Schmitt trigger, a differentiator, and a n emitter -- follower (see Figure 8-36). Field-effect transistor and its associated components, disconnects the base of 4 3 5 during the sweep cycle t o prevent the...

MODEL SERVICE t o the Pulse Shaper. Resistor and capacitor on the motherboard attenuate the ac line signal t o approximately 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 ...

SERVICE MODEL switch that connects R34 t o the comparator. Turning the manual sweep control adjusts the voltage at the control side of R34. Operational amplifier U 1, operating in a linear mode, fixes the voltage at pin 2 by feedback through the buffer amplifier, and This fixed voltage is applied th...

MODEL SERVICE Crystal filter bandwidth is determined by the current on BW6. Transistor in the Xtal PIN Driver Buffer (block D) is turned off, allowing t o establish the bandwidth control current. Depending on the setting of the RESOLUTION BW switch, one of the bandwidth control lines through BW3) is...

SERVICE MODEL Video Filter The video filter comprises control RESOLUTION BW switch and eight capacitors on the Sweep Control Assembly A9 (blocks A and B). VIDEO FILTER control varies the resistance of the RC filtering network that it forms with the video filter capacitor. The RESOLUTION BW setting d...

MODEL SERVICE - - D T H CONTROL --I MAN SCAN SWEEP I CAPACITORS SWP VIDEO FILTER I SINBLE I P I N DRIVERS - I VERT ' $ FIGURE 838. SWEEP CONTROL ASSEMBLY BLOCK DIAGRAM

MODEL SERVICE THIRD CONVERTER ASSEMBLY CIRCUIT DESCRIPTION The Third Converter Assembly A10 contains a 321.4 MHz amplifier followed by a 321.4 MHz filter, a double balanced mixer, a 21.4 MHz I F preamplifier, a flatness compensation amplifier, and a band conversion loss compensating amplifier. Also ...

SERVICE MODEL IF Preamplifier (F) The I F Preamplifier voltage gain is provided by 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 ...

MODEL SERVICE 35 MHz Calibration Oscillator (B) The 35 MHz Calibration Oscillator consists of a differential amplifier formed by Q l l and A frequency determining tank circuit C45, and is connected t o the base of The base of and one side of the tank are at RF ground due to C48. Capacitor C45 temper...

MODEL 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 connec- tions. Bandwidth Filter No. 1 Assembly is described here. Bandwidth Filter No. Assembly operates at...

MODEL 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 that results in signal amplitude loss across the crystal. Increased gain in the input buffer amplifier, caused by the load on 4 3 , compensates for...

MODEL SERVICE 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 and Positive feedback is applied t o the t a p at 21.4 MHz t o compensate for losses in the tank circuit. The app...

SERVICE Second Xtal Pole (G) The operation of the Second Xtal Pole is identical with the First Xtal Pole. MODEL Second LC Pole (F) Operation of the Second LC Pole is the same as the First LC Pole, except that performs the same function as PIN diode Output Buffer Amplifier (H) The Output Buffer Ampli...

MODEL SERVICE Band Offset (D) Operational amplifiers and their associated circuits provide offset and gain for the tilt voltage. Potentiometers R57, R58, R59, R61, and R62 are used t o adjust the offset of each band. A fixed negative offset is provided for all bands by operational amplifier The resu...

MODEL SERVICE A 1 2 S T E P G A I N 0 - 1 2 CONTROL REF LEVEL WP 1 REF LEVEL 2ND 1 0 dB 20 20 dB AMPLIFIER AMPLIFIER AMPLIFIER 2 1 . 4 I F 6 2 FLATNESS BAND MIXER DIODE BIAS SELECT DIODE BIAS DECODER 1 2 . 1 - 2 1 FIGURE STEP GAIN ASSEMBLY BLOCK DIAGRAM

MODEL BANDWIDTH FILTER No. 2 ASSEMBLY A13 SERVICE Bandwidth Filter No. 2 Assembly A13 is very similar to Bandwidth Filter No. 1 Assembly 1, and correspond- ing components have the same reference designators. The differences between the two assemblies are in the TO/ FROM designations listed on the sc...

MODEL SERVICE LOG AMPLIFIER ASSEMBLY A14, CIRCUIT DESCRIPTION The Log Amplifier Assembly A14 includes seven amplifier stages, each capable of providing linear and loga- rithmic amplification. A detector circuit following the amplifier stages the amplified 21.4 MHz I F signal, producing the vertical ...

SERVICE MODEL Resistance 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 a t the emitter of increases, signal current cancels bias current in the log diodes, increas...

MODEL SERVICE SECOND STAGE A D J U S T FEEDBACK . LINE FIGURE OPERATION IN LINEAR MODE, SIMPLIFIED SCHEMATIC collector of goes to - 8 VT, turning the log diodes on. In Lin mode, the line is at - 8 VT, is turned off and current flows through R34 (LIN) t o stages 6 and 7. Log Mode Temperature-Controll...

SERVICE MODEL Buffer Amplifier (L) The detector's output, the video signal, is amplified by the Buffer Amplifier. Differential pair 4 2 1 and driver 4 2 2 approximate a noninverting operational amplifier with a gain calculated by the Which becomes: Gain = 1 + 1 + = 2 Log Offset (M) The offset circui...

MODEL SERVICE VERTICAL ASSEMBLY A15, CIRCUIT DESCRIPTION The Vertical Assembly A15 contains a preamplifier t o amplify the detected and filtered video received from the Log Amplifier Assembly A14. It also supplies the video signal needed t o trigger the sweep generator in the video trigger mode. Fol...

SERVICE MODEL 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 a n H P 180 series mainframe, a visible trace can be produced by pressing the BEAMF...

MODEL SERVICE Sweep Ramp Limit Comparator (C) Operational amplifiers U l a and U l b are connected t o 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 limi...

SERVICE MODEL output t o the mainframe, must receive a positive voltage. T h e Blanking Driver is driven by the Vertical/ Baseline Comparator and the Sweep Ramp Limit Comparator. Either of these circuits can produce the positive input needed by the Blanking Driver t o produce a blanking output. Driv...

MODEL SERVICE A 1 5 V E R T I C A L VIDEO T R I G PREANPLIFIER AUX VERT I I VERT - GAIN > SWEEP RAMP COMPARATOR I POSN BLANKING DRIVER VERT > DRIVER I SWEEP INDICATOR RETRACE DRIVER I LEO FIGURE VERTICAL ASSEMBLY BLOCK DIAGRAM

SERVICE MODEL A15 VERTICAL ASSEMBLY V E R T I C A L D E F L E C T I O N OUT NORM V E R T VERT 1 O F F S E T NORM FIGURE 8-74. VERTICAL ASSEMBLY A15, COMPONENT LOCATIONS

MODEL SERVICE A1 6 M O T H E R B O A R D ASSEMBLY I I I 0 I D I O D E / B I A S I J 2 I I J 1 I I I L L FIGURE 876. MOTHERBOARD ASSEMBLY A16, COMPONENT LOCATIONS - - X A 7 X , , X A 1 3 C 2 0 X A 1 4 - - E X T