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HP 8444A User's Manual

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1. TEST LEADS Figure 5 2 1 55 GHz LO Power Level and Frequency Check and Adjustment Test Setup EQUIPMENT Power Meter with HP 84788 Thermistor Mount HP 432A Frequency Counter with HP 5254C Plug in HP 5245L Digital Voltmeter with HP 3443A Plugin HP 3440A Test Leads dual banana plug to probe and alligator HP 11003A Cable Assy SMA male to male HP 08555 60076 Cable Assy male BNC connectors HP 10503A Coaxial Attenuator Option 010 HP 8491A Adapter BNC barrel HP Part Number 1250 0080 UG 914A U Adapter BNC to UG 201 A U PROCEDURE 1 Perform Power Supply Check and Adjustment paragraph 5 8 2 Apply power to Tracking Generator and allow 1 hour for instrument to warm up and stabilize 3 Disconnect Cable W8 at Isolator J2 see Figures 8 4 and 8 12 4 With test setup as indicated in Figure 5 2 connect Power Meter to Isolator AT3 J2 via 08555 60076 cable 10 dB attenuator and UG 914A U adapter 5 Rotate TRACK ADJ control throughout its tuning range while noting power level indicated on Power Meter 6 Minimum power output must be greater than 5 dBm gt 5 dBm 5 4 HP 8444A Tracking Generator max Model 8444 Adjustments 5 9 7 10 11 12 13 14 15 16 17 18
2. 500 w12 J ee ex Fog RF L JL OUTPUT RF DIODE SIGNAL MODULATOR OSCILLATOR DRIVER ASSY A2 REF DIODE SIGNAL A3 MICROCIRCUIT ASSEMBLY BOTTOM VIEW SERIAL NUMBER 101 AND ABOVE _ Figure 8 15 Second Converter Circuits Schematic Diagram 958 98 WIRING DETAIL A3 MICROCIRCUIT ASSEMBLY BOTTOM VIEW SERIAL NUMBER 100 AND BELOW 98 958 8 17 8444 Tracking Generator max SERVICE SHEET 5 THEORY OF OPERATION Service Sheet 5 contains the schematic diagram for the 20 and 10 volt power supplies the input line voltage circuit and a wiring diagram of the input line switch and power line module Ell INPUT LINE VOLTAGE CIRCUIT Both schematic and wiring diagram are shown for the input line voltage circuit For 280 volt operation replace the 0 5 ampere fuse with 0 25 ampere fuse The power line module and ON OFF switch wiring diagram provides a rear view for circuit tracing or component replacement 20 VOLT POWER SUPPLY The 20 volt supply consists of bridge rectifier A1CR1 CR4 series regulator Qi filter C1 driver A1Q3 current source A1Q1 Q2 foldback current limiter 194 sense amplifier 101 and over voltage and reverse voltage protection circuit consisting of 195 and 1 6 10 The 28V rms at 05 Amp input from power transformer T1 is rectified by diodes A1CR1 CR4 and filtered by C1 to provide a 4
3. Paget aes os So om yh ee eee PER DIVISION SCAN WIDTH PER DIVISION 1 MHz INPUT ATTENUATION 10 dB TUNING STABILIZER zu epee ry ea SE doter ON SCAN TIME PER DIVISION 20 MILLISECONDS LOGJ LINEAR Lande cb ne A ee ee RU 10 dB LOG LOG REF ek eee Re 10 dBm VIDEO FILTER 5 amp 4 2 one eS Eoo ee AR 10 kHz SCAN MODE ALIAM goals ees ote au cate oh Aa tts ee INT SCAN TRIGGER GE Be eRe A ae ae ee AUTO Rotate Tracking Generator TRACK ADJ control while observing CRT display NOTE With the 1 55 GHz oscillator tuned to 1550 MHz both the 1500 and 1600 MHz comb signals will produce a response at 50 MHz Adjust the TRACK ADJ control until the responses are separated by 2 MHz 2 divisions on the display Adjust Spectrum Analzyer FREQUENCY control to center largest response on CRT display Reduce BANDWIDTH to 1 kHz and SCAN WIDTH PER DIVISION to 2 kHz while keeping signal centered on CRT display Switch Spectrum Analyzer LOG LINEAR to LINEAR and adjust sensitivity controls for a full eight division display Refer to Figure 5 4 Tune FINE TUNE so that the upward slope of the display intersects the CENTER FREQUENCY graticule line one division from the top
4. 0 5 1300 DEVICE UNDER PS Se TEST 0 5 1300 MHz 0 TO 10 d Bm HP 8444A Tracking Generator max 10 dB STEP FIRST MIXER 0 5 1300 MHz DEVICE 2 05 4 1 GHz YIG TUNED OSCILLATOR FIRST LO OUTPUT SECOND MIXER 1 5 GHz CAVITY OSCILLATOR UNDER TEST 0 5 1300 MHz 8 0 TO 10 d Bm 2 05 4 1 GHz ISOLATOR MHZ AMPL FIRST LO INPUT 1 3 GHz LOW PASS FILTER THERD LO INPUT 500 MHz 0 4 1 SOLATOR 2 0 3 4 GHz BANDPASS FILTER 2 05 3 4 GHz PAD 1 1 2 05 GHZ HP 84444 Tracking Generator max O pau E Figure 8 6 T SECOND THIRD FOURTH MIXER MIXER MIXER FILTER AND DETECTOR 2 05 4 1 GHz Y1G TUNED OSCILLATOR 1 2 GHz CAVITY OSCILLATOR 8555A SPECTRUM ANALYZER FIRST LO OUTPUT THIRD LO ourpur SCAN IN OUT SY STEM 6 Nm ee Nn 8444A FIRST LO INPUT THIRD LO INPUT SCAN TRACKING GENERATOR 2 05 4 1 GHz 500 MHz 8 0 4 dBm ISOLATOR 1 SOLATOR o MANUAL SCAN x 2 0 3 4 GHz PIN MODULATOR 2 05 3 4 GHz 500 MHz 1 55 GHz 1300 CAVITY De ISOLATOR OSCILLATOR FILTER PAD 1 0 2050 MHz 5 2 05 GHz 03 1 55 GHz 25 es 4
5. see illustrated parts breakdown Figure 8 18 With the 1 55 GHz oscillator signal applied to A5J2 measure mixer bias at test point 1 A inductor A5A1L2 Bias level should be greater than 1 2 Vdc Polarity can be either positive or negative depending on the direction on diode If diode bias is low check tuning of ADJ 1 check for tightness of screws securing cover to cavity block A5MP4 and check for tightness of screws securing the mixer block to the cavity block cover Monitor bias level during adjustments for indication of fault If there is no or very low bias voltage remove power from instrument and check diode front to back ratio Use test point and chassis ground for measurement points Check for a typical front to back ratio of 70 to 700 ohms using HP 412A VTVM with diode in parallel with A4A1R1 For actual diode front to back measurement remove the four cap screws and lift the mixer assembly from the cavity block cover Lift the diode at the 2 connector and measure front to back ratio Typically 70 to 200 000 ohms NOTE Replacement of components other than diode A5A1CR1 is not recommended Replace diode and perform First Converter Adjustment procedures in paragraph 5 11 If diode replacement does not correct malfunction replace mixer See Figure 8 18 for First Converter Assembly Illustrated Parts Breakdown n 1 55 GH
6. 2200 0172 ASMPT 08444 20007 2140 0001 3030 0151 5 19 3030 0397 ASAL 08444 60012 ASALCI 0160 2327 ASALC2 0160 3861 0160 3860 1901 0633 A5A1J1 1250 0829 9100 2254 0520 0128 ASALMP2 1251 1556 08555 00031 4 08555 20036 ASALRI 0698 7233 6 08444 60004 6 08444 60019 ATCL 9160 3827 2 0160 0345 0160 0345 7 0160 2 37 0122 0245 1250 0829 ATLL 1460 0103 ATOL 1854 0292 ATRI 0698 7230 0757 0418 5060 1189 6 6 Description COVER 500 MH AMPLIFIER HOUSING 500 MHZ AMPLIFIER BDARD ASSY 500 MHZ AMPLIFIER CER 24 PF 5 500VDCM CER 1000 PF 10 250 VDCW C FXD CER 24 PF 5 C FXD CER 24 PF 5 500VDCM C FXO CER 24 PF 5 C FXD 24 PF 54 CER 24 PF 5 CER 24 PF 5 C FXD CER 24 PF 5 500VDCM C FXD CER 24 PF 5 500VDCM CER 24 PF 5 SOOVOCH DIGDE PIN 1 2 TO 16 2 DIODE PIN 1MHZ TO 1GH2 COIL CHOKE 0 27 UH 10 COIL CHOKE 0 27 UH 10 COLL CHOKE 0 27 UH 10 COIL CHOKE 0 27 UH 104 5 5 NPN TSTR SI NPN TSTR SI NPN FLM 23 7 OHM 2 1 88 R FXD FLM 1K OHM 24 1 8H R FXD FLM 1K OHM 25 1 88
7. WW 1 0 OHM 5 2 0811 1666 1517 0698 3441 R FXD FLM 215 OHM 1 0698 3441 18 0757 0440 7 50 UHM 1 1 84 0757 0440 1819 0757 0280 R FXD FLM OHM 1 1 8W 0757 0280 41820 0757 0440 FLM 7 50K OHM 1 1 8W 0757 0440 06 98 0084 R FXD MET FLM 2 15K OHM 1 1 8W 0698 0084 41822 0698 0084 FLM 2 15 JHM 1 1 8W 0698 0084 1 823 0698 0084 R FXD MET 2 15K OHM 1 1 BwW 0698 0084 1 24 0683 0275 COMP 2 7 OHM 5 1 4W 2765 1181 08444 20001 BOARD BLANK PC 08444 20001 0360 1514 TERMINAL PIN SQUARE 9360 1514 ALTP2 0360 1514 TERMINAL PIN SQUARE 0360 1514 ALTP3 0360 1514 TERMINAL SQUARE 0360 1514 0360 1514 TERMINAL PIN SQUARE 0360 1514 11 5 0360 1514 TERMINAL PIN SQUARE 0360 1514 26 0360 1514 TERMINAL PIN SQUARE 0360 1514 1820 0223 INTEGRATED CIRCUIT OPERATIONAL AMPL 1820 0223 Alu 1820 0223 INTEGRATED CIRCULFT OPERATIDNAL AMPL 1820 0223 Ae 08444 60002 BOARD ASSY ORIVER 08444 60002 201 0180 0116 C FXD ELECT 6 8 UF 10 35y0CW 1500685X9035B2 DYS 2 2 0180 2205 C FXD ELECT 0 33 UF 10 35VDCW 1500334 9035 2 0 5 8444 Tracking Generator max Model 8444 Replaceable Parts Table 6 2 Replaceable Parts Designation 203 0180 0228 ELECT 22 UF 10 15VDCW 56289 1500226 901582 0 5 20 0180 1746 C FXD ELECT 15 UF 10 20V0CW 28480 0180 17
8. INT SCAN TRIGGER AUTO c Tracking Generator control settings TRACK ADJ si vdesance vacerceseawers Peak LEV BG 0 dBm Figure 3 9 Amplifier Gain and Bandwidth CRT Display 3 23 Precision Frequency Measurements 3 24 Anexternal frequency counter may be used with the Tracking Generator Spectrum Analyzer System for frequency measurements at any point on the CRT display With the counter connected to the Tracking Generator AUX RF OUTPUT jack rear panel and the system operated in the MANUAL SCAN mode the scan can be stopped at any point for frequency measurement CAUTION Do not leave System stopped in MAN UAL SCAN with high INTENSITY Dam age to the display CRT can result HP 8444A Tracking Generator max Figure 3 10 illustrates frequency measurement at the 30 dB point on a low pass filter a Spectrum Analyzer 8554B control settings FREQUENCY nia 50 MHz BANDWIDTH 300 2 SCAN WIDTH DIVISION 10 MHz INPUT ATTENUATION 10 dB SCAN TIME PER DIVISION 10 MILLISECONDS LOG REP LEVEL e m 0 dBm LOG LINEAR 2 2 4 4 52 25 4 LOG VIDEO FILTER OFF SCAN INT SCAN TRIGGER 2 2 AUTO b Tracking Generator control settings TRACK ADI 9 rp Russ Peak re mera ete
9. 4 17 Frequency Stability cont d Lo Faux re rere Lovey BNC CABLE RF OUTPUT TEST SPECTR UM ANALYZER Figure 4 2 Residual FM Test Setup EQUIPMENT Spectrum Analyzer HP 8554B or 8555A 8552B 141T Test Spectrum Analyzer HP 8553B 8552B 141T BNO Cablen aTa ee Ua RU RI E es HP 10503A PROCEDURE 1 Perform preset adjustment procedures paragraph 4 7 for 8554B 8552B 141T Spectrum Analyzer System or paragraph 4 9 for 8555A 8552B 141T Spectrum Analyzer System 2 Connect test setup as indicated in Figure 4 2 and make the following control settings SPECTRUM ANALYZER Tracking Generator Spectrum Analyzer System See paragraph 4 7 or 4 9 SPECTRUM ANALYZER 8553B 8552B 141T Test Analyzer POWER ESSE ee a E ura ON RANGE MHZ 208 Ena gis a Reb ode ela ates 0 110 FREQUENCY eae Goel SEL S ee Se SLs 50 MHz BANDWIDTH e em ge 30 kHz SCAN WIDTH asies eno eR RB x eS ce 8 PER DIVISION SCAN WIDTH PER DIVISION 20 022 1 MHz INPUT ATTENUATION 10 dB TUNING STABILIZER 4 ka per amp Roda ee d ON SCAN TIME PER DIVISION 20 MILLISECONDS BOGZEINIAR v geste Ba
10. 910 142 SM 90 68 30010 30014 Nid Nid 2 duro wl 5 1 wep pI E r OL v SM 1 i m oF ne 6939 1140 ASSY YOLVTNGOW 30010 Nid dW ZHW 005 i 25 0108 0080 ASSY YIXIW 15811 PY ASSY 41009 99 80 SY ASSY 15313 7 5 Figure 7 2 First Converter Circuits Schematic Diagram Manual Figure 8 12 CHANGE C HP 8444A Tracking Generator max Manual Changes ET Figure 7 3 A7 1 55 GHz Oscillator Assembly Illustrated Parts Breakdown Manual Figure 8 19 1 of 2 for Change C HP 8444 Tracking Generator max Model 8444 Model 8444A Reference part Number Designation 0960 0084 0960 0084 0960 0 168 115934 0180 2181 1210 0013 0180 2181 1210 0013 0160 0155 1250 0838 2110 0202 2110 0201 0960 0167 1250 0914 1250 0915 5040 0306 08555 20093 08555 20094 2190 0444 2950 0132 08 761 2027 1250 0118 1251 2996 1854 0063 1200 0043 1854 0063 1200 0043 2100 2730 0370 0133 2100 2886 0370 0133 2100 2728 0370 0133 0698 3449 0757 0438 3101 1248 2140 0264 08444 20018 08444 20024 08444 20024 08444 20020 08444 60015 08444 60014 08444 20017 08444 20026 08444 20027 98444 20021 08444 20019 08444 20023 08444 60016 08444 60018 08444 60018 08444 60018 08444 60017 8120 1348 1251 0159 1251 0135
11. ASSEMBLIES ARE ABBREVIATED FULL DESIGNATION IN CLUDES ASSEMBLY NUMBER e g RI OF ASSEMBLY Al DESIGNATIONS OF OTHER COMPONENTS ARE AS SHOWN HP 8444A Tracking Generator max 28 5 0 5 POWER LINE MODULE A8 REFERENCE DESIGNATIONS 20 10 VOLT POWER SUPPLY ASSY A1 08444 60001 HP 8444A Tracking Generator max Figure 8 ER SUPPLY ASSY 08444 60001 Ql cro 1853 0020 g gt a NS 31 60 Q2 Q4 12 9 815 1000 1780 20 VS 580 7 3 14 O V 2 62 3 Figure 8 17 Power Supply Input Circuit Schematic Diagram 8 19 HP 8444A Tracking Generator max 0 7 D 2222 gt 7 424 D gt 8 lt gt a gt tc 25 zx ul E Figure 8 18 A5 First Converter Assembly Illustrated Parts Breakdown 1 A8 Power Supply and Input SERVICE SHEET 5 HP 8444A Tracking Generator max 0 Y aa 8 H gt gt 2 Figure 8 18 5 First Converter Assembly Illustrated Parts Breakdown 1 of 2 Al Power Supply and Input Circuit 4 SERVICE SHEET 5 HP 8444A Tracking Generator max Service 1 2 3 3 3 4 5 6 7 8 9 10 11 12 A B 4 L 8 20 1 5 2 542 548
12. Figure 3 3 Tracking Generator Operation with 8554B Spectrum Analyzer 1 of 2 HP 8444A Tracking Generator max Model 8444 Operation OPERATING PROCEDURE WITH AN 8554B Check that the 115 230V switch is set to correspond with the available line voltage Refer to Figure 3 2 steps 4 through 8 for switch and fuse information Apply power to Tracking Generator and Spectrum Analyzer Turn Spectrum Analyzer INTENSITY control fully CCW Allow instruments to warm up for at least 30 minutes Perform Spectrum Analyzer Calibration Proce dure Refer to 8554B RF Section Operating Man ual Set Spectrum Analyzer LOG LINEAR control to LOG LOG REF LEVEL to 0 dBm and BAND WIDTH to 300 kHz Make the following interconnections between Track ing Generator and Spectrum Analyzer a FIRST LO INPUT to FIRST LO OUTPUT b THIRD LO INPUT to THIRD LO OUTPUT c RF OUTPUT to RF INPUT d SCAN OUTPUT to SCAN IN OUT Check that the Spectrum Analyzer controls are set as follows LOG LINEAR LOG REF LEVEL LOG REF LEVEL Vernier VIDEO FILTER SCAN MODE 9 Set Tracking Generator LEVEL control to 0 dBm and adjust TRACK ADJ for maximum signal ampli tude indication on CRT display Adjust Spectrum Analyzer Vernier control or Track ing Generator LEVEL control to position signal on CRT LOG REF level graticule line System cali brated at 30 MHz with an amplitude accuracy of 50 5 dB Set Spectrum An
13. ible with Tracking Generator 10 dB ible with Tracking Generator 2 dB per HP 5300A Frequency For precision frequency measurements to 500 MHz 5303A Counter 52451 Frequency For precision frequency measurements over frequency range of 0 to 50 MHz 5254C Counter and 150 to 3000 MHz HP 5060 8543 Joining Hardware and parts for strapping Tracking Generator to Spectrum Analyzer Bracket Kit Provides a common ground and secure mounting HP 8120 1575 Accessory For accessory instrument operation off of line input to Tracking Generator Power Cord Plugs mate with accessory outlet connector and line input connector on HP 5060 1189 power line module HP 8120 1576 Accessory For accessory instrument operation off of line input to Tracking Generator Power Cord Plugs mate with accessory outlet connector and line input connector HP 1251 0148 old type HP 8444A Tracking Generator max 1 7 1 8 Model 8444 Installation SECTION INSTALLATION 2 1 INITIAL INSPECTION 2 2 Mechanical Check 2 3 Check the shipping carton for evidence of damage immediately after receipt If there is any visible damage to the carton request the carrier s agent be present when the instrument is unpacked Inspect the instrument for physical damage such as bent or broken parts and dents or scratches If damage is found refer to paragraph 2 6 for recom mended claim procedures If the instrument appears to be undamaged p
14. 02 0 Boh 5 Xr 12 o clock SENSITIVITY dee At ce 1 VOLTS RMS BASES a dr sue tate sto A Sn 10 ms FONCTION A ee cae SO el ot ee US FREQUENCY Tracking Generator TRACK en eps drug Max signal amplitude m rte 0 dBm SCAN Rex ETE Pe een ae RE CCW HP 8444A Tracking Generator max Performance Tests Model 8444 PERFORMANCE TESTS 4 18 System Flatness cont d 3 10 11 12 13 14 15 16 17 4 10 Set Spectrum Analyzer SCAN WIDTH to ZERO and adjust FREQUENCY for indication of 30 MHz 100 kHz on Frequency Counter Set Spectrum Analyzer LOG REF LEVEL to 10 dBm and LOG LINEAR to 2 dB LOG Adjust Tracking Generator TRACK ADJ for maximum signal indication on CRT display Adjust Spectrum Analyzer LOG REF LEVEL Vernier control to position trace 20 LOG REF graticule line Set Spectrum Analyzer SCAN WIDTH to PER DIVISION SCAN WIDTH PER DIVISION to 10 MHz and SCAN MODE to EXT CAUTION Reduce Spectrum Analyzer INTENSITY to prevent damage to CRT display Tune Spectrum Analyzer over frequency range of 500 kHz to 50 MHz 8554B RF Section or 10 to 50 MHz 8555A RF Section with Tracking Generator MANUAL SCAN control Note and record maximum deviation from reference level set in step 6 above
15. 1 29 Recommended Test INSTALLATION 2 l Initial Inspection 2 2 Mechanical Check 2 4 Electrical Check 2 6 Claims for Damage 2 9 Preparation for Use 2 10 Power Requirements 2 13 Power Cable 2 16 Operating Environment 2 18 Installation Connections 2 21 Storage and Shipment 2 22 Original Packaging 2 26 Other Packaging Materials OPERATION 3 1 Introduction 3 3 Panel Features 3 5 Operator s Checks 3 7 Operating Instructions 3 9 Controls Indicators and 3 11 Operating Techniques 3 13 Crystal Filter Measurement 3 15 Bandpass Filter Measurement 317 Low Pass Filter Measurement 3 19 Swept Return Loss Measurement 8 21 Amplifier and Bandwidth Measurement 3 23 Precision Frequency Measurements 1 PERFORMANCE TESTS 4 1 Introduction 4 3 Equipment Required 4 5 Front Panel Checks 4 1 Preset Adjustments 8554B 8552B 141 8444 System 4 9 Preset Adjustments 8555A 855 2B 141 8444 System 4 11 Performance Tests 4 16 Output Level 4 17 Frequency Stability 4 18 System Flatness 4 19 Frequency Accuracy 4 20 Harmonie Distortion Page 1 1 1 1 1 1 1 2 1 2 1 4 1 4 1 4 1 4 1 4 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 21 2 2 2 2 2 2 2 2 3 1 3 1 3 1 8 1 8 1 8 1 8 1 3 8 3 8 3 8 3 9 3 9 3 9 4 1 4 1 4 1 4 1 4 1 4 2 4 2 4 3 4 6 4 9 4 11 4 13 Contents Section Page V ADJUSTMEN
16. SECOND FIRST JR 1 CONVERTER PST 21 2 2 O TRACK ADJ LEVEL Figure 8 6 Tracking Generator Spectrum Analyzer Simplified Block Diagram Tracking Generator Views Adjustment and Test Point Locations HP 8444A Tracking Generator max Service 8 10 SERVICE SHEET 1 GENERAL The HP Model 8444A Tracking Generator is designed for operation with either the HP Model 85541 8552 140 series or the HP Model 8555A 8552 140 series Spectrum Analyzer Systems When used with the 85541 Spectrum Analyzer RF Section the Tracking Generator covers the full range of the analyzer system When used with the 8555A Spectrum Analyzer RF Section the Tracking Generator covers the 10 MHz to 1 3 GHz frequency range on the 1 2 05 GHz IF band simplified block diagram of the Spectrum Analyzer Tracking Generator 15 illustrated in Figure 8 6 In the spectrum analyzer tracking generator system the tracking generator provides a signal that tracks the frequency tuning of the spectrum analyzer The first and third local oscillators in the spectrum analyzer are applied to the tracking generator where they are combined with the output of a 1 55 GHz cavity oscillator The frequency of the cavity oscillator corresponds with the 1 5 GHz second local oscillator the 47 MHz fourth local oscillator and the 3 MHz IF signal to the detector in the spectrum analyzer The 1 55 GHz cavity oscillator is voltage tunable by the
17. 23 Disconnect DC Voltmeter 24 Perform Level Control Calibration paragraph 5 13 5 13 Level Control Calibration Check and Adjustment REFERENCE Service Sheet 4 DESCRIPTION The level control circuitry is adjusted to provide a 10 dB tuning range of the front panel LEVEL control The level control circuitry provides the voltage level to the reference diode in the ALC detector Perform Automatic Level Control Check and Adjustment paragraph 5 12 before calibrating the level control IRD 10 T CTHIRD Lo INPUT STER POWER METER MOUNT E Figure 5 8 Level Control Calibration Check and Adjustment Test Setup EQUIPMENT Spectrum Analyzer HP 8555A 8552B 141T Power Meter i sre 2 0 Weser XE ru Je NOE Cut em p x RUN HP 432A Thermistor 84 78 PROCEDURE 1 Connect test setup as indicated in Figure 5 8 and set controls as follows Spectrum Analyzer aR REE eR ee ee n 1 2 05 GHz IF ER tae RETI bs oh 30 MHz pS eS oe ee eae exe ete d 100 kHz SCAN WID ja teu aree cee Synth a eur s ZERO INPUT ATTENUATION om E EE a 20 dB TUNING STABILIZER 52255225 fons GRON HI ON SIGNAT IDENTIFIER 2 SUE RO ome
18. A2R30 0757 0288 R FXD MET FLM 9 09K OHM 1 1 8W 28480 0757 0288 2 1 0757 0442 R FXO FLM 10 0K OHM 1 1 8W 28480 0757 0442 A2R 32 0757 0438 R FXD MET FLM 5 11K OHM 13 1 84 284 80 0757 0438 A2R33 0698 3441 R FXD FLM 215 OHM 1 1 84 284 80 0698 3441 28 34 0757 0442 R FXD FLM 10 0K OHM 13 1788 284 80 0757 0442 A2R35 0698 3399 MET FLM 133 OHM 1 1 2W 28480 0698 3399 A2R36 0757 0539 R FXD MET FLM 6 81K OHM 1 1788 284 80 0757 0459 2 37 0151 0421 R FXD MET FLM 825 OHM 1 1 88 28480 0757 0421 A2R38 0698 3438 R FXD FLM 147 OHM 14 1 8W 284 80 0698 3438 A2R39 0757 0288 R FXD MET FLM 9 09K OHM 1 1 8W 28480 0751 0288 2 0 2100 2522 R VAR WW OHM 10 TYPE V IW 19701 ET50X105 2100 1760 R VAR WW 5K OHM 5 TYPE 28480 2100 1760 2842 0698 3151 R FXD FLM 2 87 OHM 12 1 8W 28480 0698 3151 2 1 08444 20002 BOARD BLANK 28480 08444 20002 AeT 1 0360 1514 TERMINAL PIN SQUARE 28480 0360 1514 2 2 0360 1514 TERMINAL PIN SQUARE 28480 0360 1514 A2T 3 0360 1514 TERMINAL SQUARE 28480 0360 1514 2 0360 1514 TERMINAL PIN SQUARE 28480 0360 1514 A2TP5 0360 1514 TERMINAL PIN SQUARE 28480 0360 1515 2 0360 1514 TERMINAL PIN SQUARE 28480 0360 1514 201 1320 0223 INTEGRATED CIRCUIT OPERATIONAL AMPL 284 80 1820 0223 5086 7025 AMPLIFIER DETECTOR 28480 0960 2038 NOT FIELD REPAIRABLE AG AMPLIFIER ASSY 500 MHZ A4CI 0160 2357 C FXD CER FEED THRU 1
19. Casilla 3590 Robles 625 Quito Tel 545 250 Cable Hospitalar Quito EL SALVADOR Instrumentacion y Procesamiento Electronico de el Salvador Bulevar de 105 Heroes 11 48 San Salvador Tel 252787 GUATEMALA IPESA Avenida Reforma 3 48 Zona 9 Guatemala 316627 314786 66471 5 9 Telex 4192 Gu MEXICO Hewlett Packard Mexicana S A Perif rico Sur 6501 Tepepan Xochimiico Mexico 23 D Tel 905 676 4600 Telex 017 74 507 Hewlett Packard Mexicana S A de Ave Constituci n No 2184 Monterrey NL Tel 48 7192 48 71 84 Telex 038 410 Roberto 6 Apartado Postal 689 Edificio Ter n Managua Tei 25114 23412 23454 22400 Cable ROTERAN Managua PANAMA Electr nico Balboa S A 0 Box 4929 Calle Samuel Lewis Cuidad de Panama 64 2700 Telex 3485126 Curundu Canal Zone Cable ELECTRON Panama HP 8444A Tracking Generator max PERU Campania Electro M dica Los Flamencos 145 San Isidro Casilla 1030 Lima 1 41 4325 Telex Pub Booth 25424 SISIDRO Cable ELMED Lima URUGUAY Pablo Ferrando S A Comercial e Industrial Avenida 2877 Casilla de Correo 370 Montevideo Tel 40 3102 Telex 702 PUBLIC BOOTH PARA VENEZUELA Hewlett Packard de Venezuela P 0 Box 50933 Caracas 105 Los Ruices Norte 3a Transversal Edificio Segre Caracas 107 Tel 35 00 11 20 hnes Telex 2
20. Figure 1 1 Model 8444A Tracking Generator and Accessories 1 0 HP 8444A Tracking Generator max 8444 General Information SECTION GENERAL INFORMATION 1 1 INTRODUCTION 1 2 This manual contains all information required to install operate test adjust and service the Hewlett Packard Model 8444A Tracking Genera tor This section covers instrument identification description options accessories specifications and other basic information 1 3 Figure 1 1 shows the Hewlett Packard Model 8444A Tracking Generator with accessories sup plied 1 4 The various sections in this manual provide information as follows SECTION II INSTALLATION provides infor mation relative to incoming inspection power requirements mounting packing and shipping etc SECTION OPERATION provides informa tion relative to operating the instrument SECTION IV PERFORMANCE TESTS pro vides information required to ascertain that the instrument is performing in accordance with published specifications SECTION V ADJUSTMENTS provides infor mation required to properly adjust and align the instrument after repairs are made SECTION VI REPLACEABLE PARTS vides ordering information for all replaceable parts and assemblies SECTION VII MANUAL CHANGES mally will contain no relevant information in the original issue of a manual This section is reserved to provide back dated and up dated information
21. Hz peak to peak 18 Install cables removed in steps 4 through 6 5 8 HP 8444A Tracking Generator max Model 8444A ADJUSTMENTS 5 11 First Converter Check and Adjustment REFERENCE Service Sheet 3 DESCRIPTION Adjustments The 1 55 GHz oscillator cavity and the two 2 05 GHz IF bandpass cavities in the first converter are adjusted for maximum output signal level A 8555A Spectrum Analyzer System 8555A 8552 140 should be used during the adjustment procedure In addition to providing the third LO input signal the output signal can be displayed during the adjustment With the analyzer operating in the linear mode the cavities are alternately adjusted for maximum indication on the CRT When only the 8554L Spectrum Analyzer System is available the output can be monitored using a power meter such as the HP 432B CABLE ASSEMBLY SPECTRUM ANALYZER Figure 5 5 First Converter Check and Adjustment Test Setup EQUIPMENT Spectrum Analyzer HP 8555 8552 141 Gable Assembly fei el Re des HP 11592 60001 Ad3DLeti 5 UG 201A U Wrench oh Bee tin dhe a a at 5 16 inch AUE DEWET 4s m ee edes qu ten Se 10 PROCEDURE 1 Perform 1 55 GHz Oscillator Power Level Frequency Check and Adjustment paragraph 5 9 2 With test setup as indicated in Figur
22. Table 4 1 Performance Test Record Model 8444 Hewlett Packard Tested by Model 8444A Tracking Generator Serial No Date Para No Test Description Actual Max ni 4 16 Output Level Step 6 dBm 0 5 0 5 Step 7 10 12 Step 37 dB 1 1 4 17 Residual FM peak to peak 8554B Stabilized Hz 200 8555A Stabilized Hz 200 8554B Unstabilized kHz 10 8555A Unstabilized kHz 10 System Flatness 500 kHz to 1250 MHz dB 1 5 1 5 85548 10 to 1300 MHz 85554 dB 1 5 1 5 Dial Accuracy Step 5 MHz 15 15 Frequency Accuracy Step 13 kHz 10 10 4 20 Harmonic Distortion Harmonic Signal Level dBm 25 Spurious Signal Level dBm 85 4 16 8444 Tracking Generator max Model 8444 Adjustments SECTION V ADJUSTMENTS 5 1 INTRODUCTION 5 2 This section describes adjustments required to return the Tracking Generator to peak operating condition after repairs are made Included in this section are test setups and check and adjustment procedures A test card for recording data is in cluded at the back of this section Adjustment and test point location illustrations are contained in Figures 8 4 and 8 5 5 8 The adjustment procedures are arranged in numerical order For best results this order should be followed Record data taken during adjust ments in the spaces provide
23. 1400 0011 1400 0011 1200 0041 1200 0041 08444 60013 9100 3308 Table 6 2 Replaceable Parts Description CHASSIS PARTS ISOLATOR 2 PORT 2 4 GHZ ISOLATOR 2 PDRT 2 4 GHZ ISOLATOR 2 PORT 1 54 1 56 GHZ TERMINATION 50 OHM ELECT 1300 UF 75 10 BRACKET MOUNTING FOR 1 3 8 OD ELECT 1300 UF 75 10 50VDCW BRACKET MOUNTING FOR 1 3 8 00 C FXD MY 0 0033 UF 10 200 VDCW CONNECTOR RF ADAPTER TEE FUSE 0 50A 250V SLOW BLOW FOR 115V OPERATION FUSE 0 25 250V 510 810 FOR 230V FILTER TUBULAR 55 2 0 3 4 GHZ CONNECTOR CONNECTOR INSULATOR CONTACT JACK BODY BULKHEAD WASHER LOCK 7 16 28 INSULATOR CONNECTOR BNC CONNECTOR AC POWER TSTR SI NPN INSULATOR TSTR MDOUNTINGITO 3 TSTR SI NPN INSULATOR TSTR MOUNT ING TO 3 R VAR CERMET 5000 OHM 20 LIN 2W KNOB SKIRTED F R 04 250 DIA SHAFT VAR WW SK OHM 5 LIN 24 KNOB SKIRTED FOR 0 250 DIA SHAFT R VAR CERMET 1K GHM 20 LIN 2W KNOB SKIRTED FOR 0 2504 DIA SHAFT R FXD MET 28 7K OHM 15 1 84 R FXD MET FLM 5 11 OHM 1 1 8W SWITCH PUSHBUTTON SPDT ILLUMINATED LAMP GLOW MINIATURE 95V CABLE ASSY FIRST LO INPUT CABLE ASSY FILTER CABLE ASSY FILTER CABLE ASSY MIXER ISOLATOR CABLE ASSY THIRO LO INPUT CABLE ASSY FIRST CONVERTER CABLE ASSY OSCILLATOR CABLE ASSYzFIRST ISOLATOR CABLE ASSY FIRST C OUTPUT CABLE ASSY MIXER CIRCUIT CABLE A
24. Amplifier and ALC Detector Assy A3 is available as a factory repaired exchange mod ule The factory repaired module is available at a considerable savings in cost over the new module 8 13 This exchange module should be ordered from the nearest Hewlett Packard Sales and Service office using the part number in the replaceable parts table in Section VI of this manual Virtually all orders for replacement parts received by HP offices are shipped the same day received either from the local office or from a Service Center 8 14 Factory Selected Components Some com ponent values are selected at the time of final checkout at the factory Usually these values are not extremely critical they are selected to provide optimum compatibility with associated compo nents These components which are identified on the schematics with an asterisk are listed in Table 8 1 The recommended procedure for replacing factory selected component is as follows a Try the original value then perform the test specified in Section V of this manual for the circuit being repaired b If the specified test cannot be satisfac torily performed try the typical value shown in the parts list and repeat the test c the test results are still not satisfactory substitute various values until the desired result is obtained 8 15 Adjustable Components Adjustable com ponents other than front panel operating controls are listed in Table 8 2 Adj
25. Disconnect Cable W10 from A6J3 Connect a low pass filter with cut off frequency above the tuned frequency of the RF Section to A6J3 Measure power output level With 10 dBm applied from the first converter the output level should be approximately 17 dBm for a con version loss of 7 dB Output frequency should be 500 MHz the dial accuracy of the RF Section Check cables W10 W12 Refer to Service Sheet 3 for Amplifier and ALC Detector A3 troubleshooting procedure dBm Check first LO cable Refer to Spectrum Analyzer RF Section Manual for troubleshooting procedure for first LO circuits Remove jumper from A2TP1 and A2TP2 Perform adjustment procedures in paragraph 5 12 to set NULL adjustment after repairs have been accomplished Check third LO cable Refer to Spectrum Analyzer RF Section Manual for troubleshooting procedure for third LO circuits Refer to Service Sheet 3 for 500 MHz Amplifier troubleshooting procedure Refer to Service Sheet 3 for Modulator Driver trouble shooting procedure Remove Modulator Oscillator Driver Assy A2 Power level at 4 2 15 dBm Connect 1000 ohm resistor between A4C3 and chassis ground Power level at A4J2 3 dBm Tracking Generator Block Diagram with 8555A and 8554B Analyzers Disconnect c power level Level should 31 dBm NO Refer to paragra frequency check Sheet 3 for oscill Check cable W9 nect c
26. G1 51 1 1901 0385 26 1 p Wl n pl W 2 w In jl lt gt INPUT GHz Le W9 FIRST CONVERTER OUTPUT 2 05 GHz 9 REFERENCE DESIGNATIONS WITHIN OUTLINED ASSEMBLIES ARE ABBREVIATED FULL DESIGNATION IN CLUDES ASSEMBLY NUMBER e g RI OF ASSEMBLY 15 AIRI DESIGNATIONS OF OTHER COMPONENTS ARE COMPLETE AS SHOWN NOTES 1 SEE SCHEMATIC DIAGRAM NOTES TABLE 8 3 2 SEE DETAIL FOR INTERCONNECT WIRING REFERENCE DESIGNATIONS A2 CHASSIS SEALED ASSY SEALED HP 8444A Tracking Generator max 2 3 4 GHz FILTER FL1 1 SECOND CONVERTER 55 AMPLIFIER AND ALC DETECTOR 55 EQUIVALENT CIRCUIT SOLATOR AT2 348 1 3 GHz LOW PASS FILTER 4 FIRST CONVERTER OUTPUT 2 05 GHz 0 MODULATOR OSCILLATOR DRIVER 55 2 REFERENCE DESIGNATIONS WITHIN OUTLINED ASSEMBLIES ARE ABBREVIATED FULL DESIGNATION IN CLUDES ASSEMBLY NUMBER e g RI OF ASSEMBLY Al IS AIRI DESIGNATIONS OF OTHER COMPONENTS COMPLETE AS SHOWN NOTES 1 SEE SCHEMATIC DIAGRAM NOTES TABLE 873 2 SEE DETAIL FOR INTERCONNECT WIRING REFERENCE DESIGNATIONS CHASSIS HP 8444A Tracking Generator max AMPLIFIER AND ALC DETECTOR 55 54 wn 6 1 3 GHz LOW PASS FILTER LEVEL DETECTOR 4
27. J2 ce 1 4 FIRST LO INPUT 1 1 1 2 05 TO 4 1 GHz 0 8dBm OSCILLATOR FREQUENCY pos EIS j I SOLATOR Al CONTROL 0 NOTES eo 2 MHz dti ie LOSS 126 Gp le 1 55 GHz 15 Mz Jit Jl 1 gt t 10 2 2 ux zu AMPLIFIER PIN DIODE MODULATOR ASSY Ad FIRST CONVERTE 20 v 2 THIRD LO LIMITER AMPL ALC PIN MODULATOR mn H w5 gt ATTENUATOR H gt wi3 I 0 69 500 MHz OUTPUT V V PTHIRDLO 40 LY Y INPUT NOTE 1 2 __ OE Se ret th MODULATOR 3dBm NOTES 1 POWER LEVELS SHOWN ARE FOR CLOSED ALC LOOP LEVELS 2 DURING TROUBLESHOOTING WITH ALC LOOP OPEN ADJUST MODULATOR NULL FOR 500 MHz OUTPUT LEVEL OF 8dBm A4J2 3 SEE LABEL ON OSCILLATOR COVER FOR POWER OUTPUT LEVEL HP 84444 Tracking Generator max JLATOR 2 3 4GHz BP FILTER FLI ISOLATOR SECOND CONVERTER ASSY A6 pem ae ee tee 1 ERR o aec ee Re SS 12 dB LOSS 1dB Loss 12 n CONVERSION LOSS 7 dB ig ATTENUAT gy Jl Que 18 os m 2 05 GHz 231410 Doe L cU AME __ 24 dBm E MM MN 1 D 2 MHz RASSY 8 710 2 S
28. LOG REF LEVEL 0 dBm LOG REF LEVEL Vernier 0 VIDEO FILTER OFF SCAN MODE RIEN As INT SCAN TRIGGER LINE or AUTO 9 Tracking Generator LEVEL control to 0 dBm and adjust TRACK ADJ for maximum signal ampli tude indication on CRT display 10 Adjust Spectrum Analyzer Vernier control or Track ing Generator LEVEL control to position signal on CRT LOG REF level graticule line System cali brated at 30 MHz with an amplitude accuracy of 0 5 dB 11 Set Spectrum Analyzer to scan desired frequency range FREQUENCY control adjusted to center of frequency of interest SCAN WIDTH set for desired coverage 12 Insert device to be tested between Tracking Genera tor RF OUTPUT and Spectrum Analyzer RF INPUT 13 Rotate Tracking Generator MANUAL SCAN control fully counterclockwise 14 Set Spectrum Analyzer SCAN MODE switch to EXT 15 Rotate Tracking Generator MANUAL SCAN control clockwise to tune system through selected frequency range 16 For automatic scanning set SCAN MODE switch to INT and SCAN TIME PER DIVISION to desired scan time Figure 3 4 Traching Generator Operation with 8555A Spectrum Analyzer 2 of 2 HP 8444A Tracking Generator max 3 7 Operation 3 13 Crystal Filter Measurement 3 14 Figure 3 5 illustrates the CRT display for a 20 MHz crystal filter Filter characteristics 2 kHz p
29. Oscillator ounce ohm peak used in parts list pulse amplitude modulation printed circuit pulse code modula tion pulse count modulation pulse duration modulation Picofarad phosphor bronze Phillips positive intrinsic negative inverse PH BRZ PIN phase lock Phase lock oscillator phase modulation positive negative positive polystyrene porcelain positive position s used in parts list position potentiometer peak to peak peak to peak used in parts list pulse position modulation PREAMPL preamplifier pulse repetition frequency pulse repetition picosecond point pulse time modulation pulse width modulation NOTE peak working voltage resistance capacitance rectifier reference regulated replaceable radio frequency radio frequency interference round head right resistance inductance capacitance rack mount only root mean square read only memory rack and panel reverse working voltage scattering parameter second time second plane angle slow blow fuse used in parts list silicon controlled rectifier screw selenium sections semicon superhigh fre quency silicon silver signal to noise ratio single pole double throw spring split ring single pole single throw single sideband stainless steel standing wave ratio synchronize timed slow blow fuse tantalum temperature compensating All abbreviations in
30. Sos km te Di 10 ms FUNCTION Sue aod venetus dun cn dA FREQUENCY HP 8444A Tracking Generator max Performance Tests Model 8444A PERFORMANCE TESTS 4 19 Frequency Accuracy Tracking Generator TRACK IAD BY dg te ee oe Max signal amplitude Siu ka a ce Boel uq ae Sel ee Le 0 dBm MANUALSCAN mor a dh ale a arena dase ep eg due oe CCW Test Oscillator FREQUENCY 4 4 s ne a S 500 kHz 8554B 10 MHz 8555 OUTPUT ATTENUATOR o9 o A PR xA 0 dBm 3 Allow instruments to warm up and stabilize for at least 2 hours 4 Set Spectrum Analyzer SCAN WIDTH PER DIVISION to 5 MHz BANDWIDTH to 30 kHz center FINE TUNE control and set FREQUENCY to 0 MHz Note During all adjustments of FREQUENCY control approach dial setting in a clockwise direction 5 Check displacement of LO feedthru signal from CRT CENTER FREQUENCY graticule line lt 3 Div 6 Connect Test Oscillator 500 output to Frequency Counter and adjust oscillator frequency for an indication of 500 kHz 8554B 10 MHz 8555A 7 Disconnect cable between Tracking Generator RF OUTPUT and Spectrum Analyzer INPUT 8 Connect Test Oscillator to Spectrum Analyzer INPUT and tune Spectrum Analyzer to Test Oscillator frequency 9 Reduce Spectrum Analyzer SCAN WIDTH PER DIVISION to 5 kHz and BANDWIDTH to 1
31. duh Re e EO n id uec owe Bed RESOLUTION BW 0 0 800 kHz FREQSPAN DIV 50 kHz BASE LINE SWEEP TIME DIV 5 MILLISECONDS dB DIV LIN os s n n n s 10 dB DIV OPTIMUM 0 REF LEVEL dBm 2 2 2 2 2 2 2 0dBm REF LEVEL FINE 4 4909 0x or odo o 9 oom Wok 40 VIDEO 20clock SWEEP TRIGGER LINE Set Tracking Generator LEVEL control to 0 dBm and adjust TRACK ADJ for maximum signal amplitude indication on CRT display Adjust Spectrum Analyzer REF LEVEL FINE control or Tracking Generator LEVEL control to position signal CRT LOG REF level graticule line System calibrated at 30 MHz with an ampli tude accuracy of 0 5 dB Set Spectrum Analyzer to scan desired frequency range Insert device to be tested between Tracking Generator RF OUTPUT and Spectrum Analyzer RF INPUT Set Spectrum Analyzer Sweep Time to MAN Rotate Spectrum Analyzer MANUAL SWEEP control clockwise to tune system through selected frequency range For automatic scanning set SCAN MODE switch to INT and SWEEP TIME DIV to desired scan time SECTION IV PERFORMANCE TESTS Add the following Proper operation of the SPECIAL 500 MHz Oscillator after a one hour warm up may be chec
32. it can result in damage to the circuit board and or adjacent components b Do not use high power soldering iron on etched circuit boards Excessive heat may lift a conductor or damage the board c Use suction device or wooden toothpick to remove solder from component mounting holes HP 8444A Tracking Generator max 8444 R C L ocv Service Table 8 3 Schematic Diagram Notes SCHEMATIC DIAGRAM NOTES Refer to USAS Y32 2 1967 Resistance is in ohms capacitance is in microfarads and inductance in millihenries unless otherwise noted Part of Asterisk denotes a factory selected value Value shown is typical Capacitors may be omitted or resistors jumpered Screwdriver adjustment Panel control Encloses front panel designations Encloses rear panel designations Circuit assembly borderline Other assembly borderline Heavy line with arrows indicates path and direction of main signal Heavy dashed line with arrows indicates path and direction of main feedback Wiper moves toward CW with clockwise rotation of control as viewed from shaft or knob Numbered test point Measurement aid provided Lettered test point No measurement aid provided Encloses wire color code Code used MIL STD 681 is the same as the resistor color code First number identifies the base color second number the wider stripe and the third number identifies the narr
33. power Consumed power is normally less than 15 watts 2 12 The 115 230 power selector switch on the rear panel line power module must be set to agree with the available line voltage The selector switch is located below the fuse holder and fuse extractor lever An arrow on the selector switch points to callouts listing the line input voltage and fuse amperage rating To change the position of the selector switch it is necessary to remove the power cable slide the protective cover to the left and lift the fuse extractor before the switch can changed With the fuse extractor extended press down and toward the desired direction Replace fuse with a fuse of the amperage rating for the selected position See Section VI for replacement HP Part Numbers The instrument is normally shipped with fuse installed for 115 volt operation 2 13 Power Cable 2 14 To protect operating personnel the National Electrical Manufacturers Association NEMA and the International Electrotechnical Commission IEC recommends that the instrument panel and cabinet be grounded The Tracking Generator is equipped with a three conductor power cable the third conductor is the ground conductor and when the cable is plugged into an appropriate receptacle the instrument is grounded To preserve the pro tection feature when operating the instrument from a two contact outlet use a three prong to two prong adapter and connect the green or green yellow lead on t
34. 1 INTRODUCTION 6 2 This section contains information for ordering parts Table 6 1 lists abbreviations used in the parts list and throughout the manual Table 6 2 lists all replaceable parts in reference designator order Table 6 3 contains names and addresses that cor respond to the manufacturer s code numbers 6 3 ABBREVIATIONS 6 4 Table 6 1 gives a list of abbreviations used in the parts list schematics and throughout the manual In some cases two forms of the abbre viations are given one is in capital letters while the other is partial or no capitals This occurs because in the parts list abbreviations are all capitalized However in the schematics and other parts of the manual other abbreviation forms are used with both lower case and upper case letters 65 REPLACEABLE PARTS LIST 6 6 Table 6 2 is a list of replaceable parts and is organized as follows a Electrical assemblies and their components alpha numerical order by reference designation b Chassis mounted parts in alpha numeric or der by reference designation c Miscellaneous parts The information given for each part consists of the following a The Hewlett Packard part number b The total quantity Qty used in the in strument c The description of the part d The typical manufacturer of the part in a five digit code e Manufacturer code number for the part The total quantity for each part is given only once a
35. 1 2 This section contains information for adapting this manual to instruments for which the content does not apply directly 7 3 adapt this manual to your instrument refer to Table 7 1 and make all of the manual changes listed opposite your instrument serial num ber Perform these changes in the sequence listed 1 4 1f your instrument serial number is not listed on the title page of this manual or in Table 7 1 below it may be documented in a yellow MAN UAL CHANGES supplement For additional im portant information about serial number coverage refer to INSTRUMENTS COVERED BY MANUAL in Section I Table 7 1 Manual Changes by Serial Number 1215A 7 5 MANUAL CHANGE INSTRUCTIONS CHANGE A Page 1 2 Table 1 1 Serial Prefix or No Make Manual Changes Change Nonharmonic Spurious Signals under Spectral Purity to gt 40 dB below output level Page 4 13 Paragraph 4 20 Change Nonharmonic Spurious Signals in Specification to read gt 40 dB below output level Page 4 15 Paragraph 4 20 Step 12 Change spurious to lt 40 dBm Page 4 16 Table 4 1 Change 35 to 40 for paragraph 4 20 Spurious Signal Level CHANGE B Page 1 2 Table 1 1 change Spectral Purity Harmonic Distortion specification to read Harmonic Distortion 25 dB below output level Page 4 13 Paragraph 4 20 Harmonic Distortion change SPECIFICATION to read Harmonic Distortion 25 dB below output level Nonharm
36. 1 8W POWER LINE MODULE NON FILTERED HP 84444 Tracking Generator max Model 8444A Mfr Part Number 08444 00006 08444 20011 08444 60005 301 000 0060 240 0160 3956 301 000 060 240 301 000 0060 2404 301 000 0000 2404 301 000 0060 2404 301 000 060 2464 301 000 C0G0 240J 301 000 C060 240J 301 000 060 240 301 000 COG0 240J 1901 0639 1901 0635 9100 2252 9100 2252 9100 2252 9100 2252 235179 245179 285179 0698 7197 0698 7236 0698 7236 0698 7236 0698 7236 0698 7236 0698 7236 0698 7236 0698 7236 0698 7236 0698 7214 08444 20005 08444 60011 50 045 4610 50 045 4610 20 045 4610 08555 00033 080 08555 20035 08444 20012 080 08444 20007 3030 0151 080 08444 60012 81048 X102M 2930 000 3903 2930 000 390J 1901 0633 50 0 5 510 9100 2254 080 2 330808 8 08555 00031 08555 20036 0598 7233 08444 60004 08444 60019 663UW22354W2 FB28 102M 28 1029 1N5139 50 045 4610 080 1854 0292 0698 7230 0757 0418 5060 1189 Replaceable Parts Table 6 1 Reference Designations and Abbreviations assembly attenuator isolator termination fan motor battery capacitor coupler diode diode thyristor varactor directional coupler delay line annunciator signaling device audible or visual lamp LED ampere alternating current accessory adjustment analog to digital au
37. 19 20 21 ADJUSTMENTS 1 55 GHz Oscillator Power Level Frequency Check and Adjustment cont d Connect Frequency Counter to Isolator 42 via 08555 60076 cable UG 914A U adapter BNC to BNC cable Rotate TRACK ADJ control fully counterclockwise and record oscillator frequency 1 548 000 500 kHz Rotate TRACK ADJ control fully clockwise and record oscillator frequency 1 552 000 500 kHz Record frequency tuning range frequency recorded in step 9 minus frequency recorded in step 8 4 000 500 kHz data recorded in steps 8 9 and 10 is within tolerance no adjustment is required If data recorded in steps 8 9 or 10 is not within tolerance proceed with step 13 Connect Digital Voltmeter to test point 2 5 Set TRACK ADJ control fully clockwise Set TUNE potentiometer A2R26 and MIN TUNE potentiometer A2R27 fully counterclockwise Measure voltage at A2TP5 Voltage should be 1 0 1 Vde 0 9 1 1 Vde Measure and record oscillator frequency Adjust MAX TUNE potentiometer A2R26 to increase oscillator frequency 4 000 50 kHz above frequency recorded in step 15 Record oscillator frequency Set TRACK ADJ control to center of tuning range recorded in steps 15 and 16 above Record oscillator frequency If frequency recorded in step 17 is not within 500 kHz of 1 550 GHz adjust 1 to tune oscillator frequency to 1 550 2 100 kHz If oscillator frequency is adjust
38. 2110 0269 CLIP FUSE 0 2504 DIA 6008 32 ALM P2 2110 0269 CLIP FUSE 0 250 6008 32 2110 0269 CLIP FUSE 0 250 DIA 5008 32 AIMP4 2110 0269 CLIPZFUSE 0 250 DIA 6008 32CN ALOL 1353 0020 TSTR SI PNP SELECTED FROM 2N3702 1853 0020 182 1853 0012 TSTR SI PNP 2N2904A 1 43 1854 0039 TSTR SI NPN 243053 ALQA 1858 0011 5 8 51 NPNASELECTED FROM 2N3704 1854 0071 105 1853 0020 TSTR SI PNP SELECTED FROM 2 393702 1853 0920 106 1854 0039 TSTR SI NPN 243053 107 1859 0071 TSTR SI NPNISELECTED FROM 2N3704 1854 0071 AIRL 0698 3160 MET FLM 31 6K OHM 12 1 8W 0698 3160 AIR2 0698 3445 R FXD MET FLM 348 OHM 1 1 84 0698 3445 183 0757 0440 MET 7 50 OHM 1 1 8W 0757 0440 0811 1666 R FXD WW 1 0 DHM 5 2 0811 1566 AIRS 0698 3441 R FXD FLM 215 OHM 1 1 8W 0698 3441 AlR6 0757 0440 FLM 7 50K OHM 1 1 80 0757 0440 0757 0280 R FXD MET FLM 1K OHM 1 1 8W 0757 0280 0757 0401 R FXD FLM 100 OHM 1 1 8W 0757 0401 ALRI 0757 0438 R FXD FLM 5 11K DHM 1 1 8W 0757 0438 1 10 0683 0275 R FXD COMP 2 7 OHM 52 l 4W 2705 AIRII 0757 0280 R FXD MET FLM LK OHM 1 1 8W 0757 0280 0757 0278 R FXD FLM 1 78K OHM 1 1789 0757 0278 ALR13 0757 0289 R FXO FLM 13 3K 1 1789 0757 0289 1 2100 1758 R VAR WW LK OHM 5X TYPE V 18 2100 1758 AIRI5 0757 0200 R FXO FLM 5 62K OHM 1 1 8 0151 0200 ALR16 0811 1666
39. 5 4 6 ASMP7 10 2 1 1 1 5 1 1 2 1 Description Model 8444A HP Part No INPUT OUTPUT LOOP SCREW PAN HD SLOT DR 0 80 X 0 88 LG CONNECTOR RF 50 OHM SCREW ON CONNECTOR RF 50 OHM SCREW ON CONNECTOR RF 50 OHM SCREW ON SCREW PAN HD POZI DR 5 40 X 0 5 LG CAVITY BLOCK FIRST CONVERTER COVER CAVITY BLOCK SCREW FLAT HD POZI DR 4 40 X 0 874 LG CENTER POST CAVITY NUT HEX STL 10 32 X 3 8 SCREW SOCKET CAP 4 40 THREAD SCREW SET 10 32 UNF 2A THREAD MIXER OUTPUT ASSY C FXD CER 1000 PF 20 100 VDCW C FXD MICA 39 PF 5 250 VDCW C FXD MICA 18 PF 5 250 VDCW SCREW PAN HD POZI DR 2 56 X 0 25 LG R FXD MET FLM 750 OHM 2 1 8W See A5J1 ABOVE CONNECTOR SINGLE CONTACT DIODE HOT CARRIER COIL CHOKE 0 39 UH 10 LID RESONATOR HOUSING RESONATOR HOUSING 08555 00033 0516 0005 1250 0829 1250 0829 1250 0829 2200 0111 08555 20035 08444 20012 2200 0172 08444 20007 2740 0001 3030 0151 3030 0397 08444 60012 0160 2327 0160 2327 0160 3861 0520 0128 0698 7233 1251 1556 1901 0633 9100 2254 08555 00031 08555 20036 Figure 8 18 5 First Converter Assembly Illustrated Parts Breakdown 2 of 2 HP 8444A Tracking Generator max D H M H Model 8444 Fi
40. 7 until Power Meter indicates 0 dBm with LEVEL control fully clockwise 10 Disconnect Power Meter and Thermistor Mount from Tracking Generator RF OUTPUT 11 Connect cable between Tracking Generator RF OUTPUT and Spectrum Analyzer INPUT 12 Set Tracking Generator TRACK ADJ for maximum signal level on Spectrum Analyzer CRT display 13 Note and record signal level at 30 MHz 0 50 5 dBm 5 14 HP 84444 Tracking Generator max 91 4 81 8 XEN pev sqjueurgsnfpy uontsod THAAT 0 uontsod 01 1ueunsnfpy 1043409 peusis 13041000 31ueunsnfpy pue 4 15414 96 ZHN 9 qun xa 3 WA 9849 lenpisay 1032111250 ZHD 991 asuey Buung qndo pue 33949 Aouanbaly 103811250 ZHO 9891 erddu Ajddns 01 Ajddns 05 Ajddns 01 Ajddns 05 1ueunsnfpy pue 72942 Ajddns uonduose 3891 BLES 3o3e1euor SuryoeXI OPW paexoeq 1391M9H 182 49945 71 9 2404 8444 Tracking Generator max UE Model 8444 Replaceable Parts SECTION VI REPLACEABLE PARTS 6
41. Adjusts Tracking Generator RF OUTPUT 3 2 5 level over range of 0 to 10 dBm Level calibrated for 0 dBm at 30 MHz with accuracy of 0 5 dB Set LEVEL contro to 0 dBm for calibrated CRT display on Spectrum Analyzer OUTPUT Connector Tracking Genera tor RF output connector Frequency adjusted to track tuning of Spectrum Analyzer by TRACK ADJ 3 Output level adjusted by LEVEL 4 THIRD LO INPUT BNC connector Input for Spectrum Analyzer third LO 500 MHz Norm ally used with 8554B RF Section Parallel with rear panel THIRD LO INPUT which is normally used with 8555A RF Section FIRST LO INPUT Type BNC connector Input for Spectrum Analyzer first LO 2 05 3 3 GHz with 8554L RF Section 2 05 4 1 GHz with 8555A RF Section SCAN OUTPUT Type BNC connector Manual tune voltage to Spectrum Analyzer 0 to 10 Vdc Voltage level controlled by position of MANUAL SCAN 2 Figure 3 1 Model 8444A Tracking Generator Front Panel Controls Indicators and Connectors HP 8444A Tracking Generator max Model 8444 Operation REAR PANEL amp AUX RF OUTPUT BNC connector Tracking Generator auxilliary RF output Same frequency as signal out front panel RF OUTPUT connector For use with external frequency counter during precision frequency measurements Terminate in 50 ohms THIRD LO INPUT connector Input for Spectrum Analyzer th
42. Ae eoe acus del E 250 MHz BANDWIDTIT 2 107 24 23 fee Sues eile ed als 300 kHz SCAN WIDTH ew woe ee PER DIVISION SCAN WIDTHPERDIVISION 50 MHz INPOT ATTENUATION ao Gh ew moror ecu 20 dB BASE LINE CLIPPER 12 o clock VIDEO FILTER 5 8 ur gt EI erm OFF SCAN TIME PER DIVISION 10 MILLISECONDS LOGILINEAE tee RE ee Ses ct ia Se c te eim 10 dB LOG LOG REF LEVEL eee kei aras bee ie 10 dBm LOG REF LEVEL Vernier io oni eS bee ase 0 SOCAN MODE ek hte as OE ae s ON Gh ete INT SCAN TRIGGER 22155455585 X oe Te eee nee wos LINE 9 Observe the Test Analyzer display for harmonic and spurious signals 10 Figure 4 8 illustrates a typical display of the LO feedthru fundamental and second harmonic signals 11 Repeat the above procedure at frequency of interest 12 Note and record maximum amplitude level of harmonic and spurious signals Harmonics typically lt 25 dBm Spurious lt 35 dBm Figure 4 7 Typical Harmonic Distortion Figure 4 8 Typical Harmonic Distortion CRT Display 0 to 100 MHz CRT Display 0 to 500 MHz 4 15 HP 8444A Tracking Generator max Performance Tests
43. DIODE SIGNAL LEVEL CONTROL 1 Figure 8 7 Tracking Generator Block Diagram with Spectrum Analyzer Interconnections 8 11 HP 8444A Tracking Generator max TRACKING GENERATOR TROUBLESHOOTING TREE INTRODUCTION The troubleshooting tree is designed to isolate a malfunction to the com ponent or assembly level During troubleshooting the ALC loop is disabled and adjusted to a power level equivalent to the normal loop level Prior to troubleshooting the Tracking Generator ensure that the Spectrum Analyzer is functioning properly and all interconnections are correct Block reference numbers in the troubleshooting tree correspond with block numbers on the block diagram and with the test points on the test point illustration Perform the procedure in the order given with the test equipment listed or with test equipment meeting the minimum specifications listed in Table 1 3 TEST EQUIPMENT Digital Voltmeter HP 3440A 3443A Frequency Counter HP 5245L 5254B Power Meter s 4 432 847 Coaxial Attenuator 8491A Option 10 Spectrum Analyzer 8554 8555A 8552 140 series Low Pass Filter ae yd eh b 360A BNC Cable EE HP 10503A Adapter BNC Jack to BNC Jack XL 9144 0 HP 1250 0080 Test lead with alligator clips common Wrench 5 16
44. Do not use repaired fuses or short circuit the fuse holders 1 15 Whenever it is likely that the protection has been impaired make the instrument inoperative and secure it against any unintended operation WARNINGS If this instrument is to be energized through an autotransformer for voltage reduction make sure the common termi nal is connected to the earthed pole of the power source BEFORE SWITCHING ON THE IN STRUMENT the protective earth termi nals of the instrument must be connected to the protective conductor of the mains power cord mains plug shall only be inserted in a socket outlet provided with 1 1 HP 8444A Tracking Generator max General Information protective earth contact The protection must not be negated by using an exten sion cord power cable without a pro tective grounding conductor Interruption of the protective ground ing conductor inside or outside the instrument or disconnection of the pro tective earth terminal is likely to make this instrument dangerous Intentional interruption of the earth ground is pro hibited Servicing this instrument often requires that you work with the instrument s pro tective covers removed and with ac power connected Be very careful the energy at many points in the instrument may if contacted cause personal injury With the ac power cable connected the ac line voltage is present at the terminals of the power line module and at the L
45. Harmonic Distortion cont d LOG REE LENE Le 21 twee tutte de Y ede T 0 dBm LOG REF LEVEL Vernier 0 2 0 SCANMODE gate cw Y ad cs WW ohne Pe ee SCAN TRIGGER Roch LINE Tracking Generator Spectrum Analyzer System Tracking Generator TRACK AIS os re MR uou Gin Max signal level LEVEL dtum 4 hes cen stia 0 dBm Spectrum Analyzer BANDE hace dw cot Ea ee 1 2 05 GHz IF EREQUENCY dou Eu by ek Ded Uk ae 50 MHz TUNING STABILIZER eR eR oe s SIGNALIDENTIFIER OFF BANDWIDTH eese ud ON 300 kHz SCAN WIDTH sx ete ae ik Send XC d PER DIVISION SCAN WIDTH PER DIVISION 10 MHz INPUT ATTENUATION 20 dB LINE CLIPPER 25 524 a Re ee 9 o clock SCAN TIME PER DIVISION 0 5 SECONDS A Re Bed 10 dB LOG LOG REF LEVEL Vernier 0 VIDEO FILTER Bt eg ghia we LUE Ie om E OFF SCAN MODE ea ek INT SCAN TRIGGER ee ae PE cy A UE WO bbb Ens LINE 85
46. Location of 500 MHz LO OUTPUT BNC Connector Added on Rear Panel of the 8444A Option 058 D 7 HP 84444 Tracking Generator max 8444 Appendix D NAOHS SY 313 1dWOD 38Y SLNSNOdWOD Y3HLO 30 SNOILYNOIS3O SI ly AT8W3SSY 30 iN 5 ATEW3SSY 530079 NI 9 1534 1114 Q31viA3488V 53118 355 93411100 SNOILYN9IS3Q0 328333438 6r L 72099 77730 A18W3SSV 01 111250 ZHW 006 6V ASSY 514405 Figure D 3 9 500 MHz Oscillator Assembly Schematic D 8 HP 8444A Tracking Generator max HEWLETT hp PACKARD 0 5 amp SERVICE OFFICES AFRICA ASIA AUSTRALIA ANGOLA Telectra Empresa T cnica de Quipamentos El ctricos SA A L R Barbosa Rodngues 42 1 DT Cana Postal 6487 Luanda 35515 6 Cable TELECTRA Luanda AUSTRALIA Hewlett Packard Australia Ltd 31 41 Joseph Street Blackburn Victoria 3130 36 Doncaster East Victoria 3109 Tel 89 6351 Telex 31 024 Cable HEWPARD Melbourne Hewlett Packard Australia Ltd 31 Bridge Street Pymble New South Wales 2073 Tel 449 6566 Telex 21561 Cable HEWPARD Sydney Hewlett Packard Australia n ltd 153 Greenhill Road Parkside 5063 272 5911 Telex 82536 Cable HEWPARD Adelaide Hewlett Packard Australia Ltd 141 Stirhng Highway Nedlands 6009 Tel 86 5455 Telex 93859 Cable HEWPARD Perth Hewlett Packard
47. NOTE The linear portion of the analyzer IF filter skirt is used to slope detect low order residual FM The analyzer is stabilized and the detected FM is displayed in the time domain HP 8444A Tracking Generator max Adjustments Model 8444A ADJUSTMENTS 5 10 1 55 GHz Oscillator Residual FM Check cont d 14 Note where the slope intersects the middle horizontal graticule line 0 2 DIV Horizontal Displacement divisions HORIZONTAL DISPLACEMENT 71 7 15 Use the horizontal displacement to 2 calculate demodulation sensitivity ue RS 2 3 VERTICAL Convert the horizontal displacement DISPLACEMENT j fl divisions into Hertz tanen 106 Example 2 kHz SCAN WIDTH x 0 2 div 400 Hz b Calculate demodulation sensitivity by dividing the vertical displacement in divisions into the horizontal displacement in Hz center FREQUENCY 133 Hz div Figure 5 4 Demodulation Sensitivity Example 3 divisions Measurement 16 Turn SCAN WIDTH to ZERO scan Set FINE TUNE for a response level within the calibrated three division range one division from the top to the center horizontal graticule line 17 Measure the peak to peak deviation and multiply it by the demodulation sensitivity obtained in step 15b above Example 0 5 div p p signal deviation x 133 Hz div 66 5 Residual FM
48. R FXD FLM 1K OHM 2 1 8W R FXD FLM IK OHM 2 1 BwW R FXD FLM LK OHM 2 1 88 R FXD 1K OHM 2 1 88 82 FLM 1K OHM 22 1 8W R FXD FLM IK OHM 2 1 8M FLM 1K OHM 2 1788 R FXD FLM 121 OHM 2 1 8W BOARD BLANK CONVERTER ASSY FIRST CONNECTOR RF 50 0 SCREW 50 0 SCREW TYPE 50 0 SCREW UN INPUT OUTPUT LOOP SCREW PAN HO SLOT 0 80 X 0 188 LG SCREW PAN HD POZI DR 4 40 X 0 500 LG CAVITY BLOCK SECOND CONVERTER COVER FIRST CONVERTER SCREW FLAT HD POZI DR 4 40 X 0 875 LG CENTER POST NUT HEX 10 32 THREAD SCREW S CKET CAP 4 40 THREAD SCREW SET 10 32 UNF 2A THREAD MIXER ASSY FIRST C FXD CER 1000 PF 20 100VDCW C FXD 18 PF 5 250 C FXD MICA 39 5 25 DIOOE HOT CARRIER CONNECTOR RF 50 08 SCREW DN TYPE COIL CHOKE 39 UH 10 SCREW PAN HD POZI DR 2 56 X 0 250 LG CONNECTOR SINGLE CONTACT LIO RESONATOR HOUSING RESONATOR HOUSING FLM 750 OHM 2 1 8w MIXER ASSY OUTPUT NOT RECOMMENDED FOR FIELD REPAIR OSCILLATOR ASSY 1 55 GHZ NOT RECOMMENDED FOR FIELD REPAIR PARC 1 PF 500VDCW C FXD CER FEED THRU 1000 PF C FXD CER FEED THRU 1000 PF SOOVDCH C FXD CER 5000 PF 80 20 C VOLTAGE VAR 6 8 PF 10 60VOCW 50 0HM SCREW ON TYPE SPRING COMPRESSION 0 120 00 51 NPN R FXD FLM 562 OHM 2 1 8W R FXD FLM 619 OHM 1
49. SIDE 3 X 161 BLUF GRAY 28480 5000 0730 MP3 5000 8593 2 510 3 X 160 0LIVE GRAY 28480 5000 8593 5920 0900 1 TRIM PANEL LIGHT GRAY 28480 5020 0900 MPG 5020 6850 TRIM PANEL MINT GRAY 28480 5020 6850 5029 0901 1 TRIM LIGHT GRAY 28480 5020 0901 MP5 5020 0851 1 TRIMS PANELEMINT GRAY 28480 5000 6851 MPO 5040 0170 4 GUIDE PLUG IN PC 28480 5040 0170 5000 0730 2 FRAME ASSY 3 X 16 28480 5060 0730 MP8 5060 0740 1 COVER ASSY TOP 161 BLUE GRAY 28480 5060 0740 6 5060 8584 1 COVER ASSY TOP L6LCOLIVE GRAY 28480 5060 8589 MPO 5060 0752 1 COVER 55 161 BLUE GRAY 28480 5060 0752 MPY 5060 8713 1 COVER BOTTOM 28480 5060 8713 MPL 5060 0767 5 FOOT ASSY FM 28480 5060 0767 MPLL 5060 0774 1 RACK MOUNTING KIT 3H LIGHT GRAY 28480 5060 0774 MPIL 5060 6739 1 KIT RACK MUUNT MINT GRAY 284A0 5060 8739 MpP12 08663 40002 1 TRIM STRIPCLIGHT GRAY 28480 08443 40002 2 08443 40005 1 TRIM STRIPCMINT GRAY 28480 08443 40005 MP13 08444 00001 1 PANEL FRONTCBLACK LIGHT GRAY 28480 08444 00001 13 08444 00013 1 BLACK MINT GRAY 28480 08444 00013 MPl 08444 00002 1 PLATE CONNECTOR 28480 08444 00002 1 08444 00015 1 PLATE BLACK 28480 08444 00015 15 98444 00003 1 DECK 28480 08444 00003 MP 1S 08444 00004 1 PANEL 28480 08444 00004 MP17 03444 00007 1 GUARD 28480 08444 00007 MP13 08445 00008 4
50. Tracking Generator THIRD LO INPUT 8 Connect Tracking Generator RF OUTPUT to Spectrum Analyzer RF INPUT h Connect Tracking Generator SCAN OUT PUT to Spectrum Analyzer SCAN IN OUT i Set Spectrum Analyzer controls as fol lows INTENSITY 12 o clock approx FREQUENCY 30 MHz BANDWIDTH 300 kHz SCAN WIDTH PER DIVISION SCAN WIDTH PER DIVISION 200 kHz INPUT ATTENUATION 20 dB TUNING STABILIZER On BASE LINE CLIPPER CCW SCAN TIME PER DIVISION 10 MILLISECONDS LOG LINEAR 10 dB LOG LOG REF LEVEL 0 dBm LOG REF LEVEL Vernier 0 VIDEO OFF SCAN MODE ERE INT SCAN TRIGGER LINE or AUTO DEVE Livesey pex RR Ee reco dBm k Adjust TRACK ADJ control for maximum amplitude of trace on CRT display 1 If trace isnot within 0 5 dB of LOG REF level graticule line repeat Spectrum Analyzer cali bration procedure m Reconnect Tracking Generator RF OUTPUT to Spectrum Analyzer RF INPUT and adjust TRACK ADJ for maximum signal amplitude n Rotate LEVEL control fully counter clockwise 10 dBm and note signal level on CRT display 10 to 12 dBm 4 1 HP 8444A Tracking Generator max Performance Tests If the signal level is off more than 50 5 dB at the 0 dBm point n
51. Zero Sean Analyzer is fixed tuned receiver Frequency Resolution 1 kHz Stability Residual FM peak to peak Tuning Section Stabilized Unstabilized 8554B 8555A 200 Hz 10 kHz Amplitude Accuracy System Frequency Response 1 5 dB Tracking Generator Calibration 0 dBm at 30 MHz to 0 5 dB SWEEP CW GENERATOR The tracking generator spectrum analyzer system can be used to supply test signals for other devices as a sweeper Frequency Controlled by spectrum analyzer Range is 500 kHz to 1250 MHz with the 8554B and 10 MHz to 1300 MHz with the 8555A Frequency Accuracy 10 MHz 85548 15 MHz 8555 using spectrum analyzer tuning dial Can be substantially improved using extemal counter output Spectral Purity Residual FM peak to peak Tuning Section Stabilized Unstabilized 8554B 8555A 200 Hz 10 kHz Harmonic Distortion Typically 25 dB below output level Nonharmonic spurious Signals gt 35 dB below output level Flatness 0 5 dB Long Term Stability Drift typically less than 20 kHz hour when stabilized after 2 hour warmup Sweep Width 20 kHz to 1250 MHz 8554 1300 MHz 8555 Sweep Rates Selected by Scan Time per Division on spectrum analyzer 16 internal scan rates from 0 1 msec div to 10 sec div in 1 2 5 sequence Manual Scan is available with the external sweep voltage from the 8444A or by a front panel control of the 8552B IF Section PRECISION FREQUENCY MEASUREMENTS An e
52. d Xs OFF BASE GINE CLIPPER 52 428 QR ee SCAN TIME PER DIVISION 10 MILLISECONDS LOG REF DEVEL gpu Mid rede er ae e Wed 10 dBm gt 2 md od a Ve ae LOG HP 8444A Tracking Generator max Adjustments Model 8444A ADJUSTMENTS 5 13 Level Control Calibration Check and Adjustment cont d BRO Gs pa es AR a ee 4 OFF 1 05 Sune a Bie Shp ah m un Moe ie ao wack INT SCAN TRIGGER 5 er RE m uA A ae NU IW gem But ed AUTO unns emet Se tag st eee Wess Sn e yk Be eL ON TRACK ADI 2 65 ROC EVE Ree Peak signal indication on CRT LEVEL ue SU soy etd lg m ERE opes ahs 0 dBm 2 Adjust TRACK ADJ for maximum signal indication on CRT display 3 Disconnect cable between Tracking Generator RF OUTPUT and Spectrum Analyzer INPUT 4 Connect Thermistor Mount and Power Meter to Tracking Generator RF OUTPUT 9 Adjust A2R41 0 dBm LEVEL for an indication of 0 0 5 dBm on Power Meter 6 Set Tracking Generator LEVEL control fully counterclockwise 7 Adjust A2R40 10 dBm LEVEL for an indication of 10 to 12 dBm on Power Meter 8 Set Tracking Generator LEVEL control to 0 dBm 9 Repeat steps 5 through
53. eG ee 10 dB LOG LOG REE LEVELS lt do oy dow XU eng y ee ok ae 10 dBm VIDEO nieto eke i 10 kHz SCAN MODE 2 mur eaput axo gad Cher das I eta Tren INT SCAN TRIGGER yea ae bot we A Ee ick Eo AUTO 3 Set Tracking Generator Spectrum Analyzer System FREQUENCY to 50 MHz and SCAN WIDTH to ZERO HP 8444A Tracking Generator max Performance Tests Model 8444 PERFORMANCE TESTS 4 17 Frequency Stability cont d 4 5 10 11 12 13 14 4 8 Connect Tracking Generator AUX RF OUTPUT to Test Analyzer RF INPUT Adjust Test Analyzer FREQUENCY control to center signal on CRT Display Reduce Test Analyzer BANDWIDTH to 1 kHz and SCAN WIDTH PER DIVISION to 2 kHz while keeping signal centered on CRT display Set Test Analyzer INPUT ATTENUATION to 30 dB LOG LINEAR o LINEAR and LINEAR SENSITIVITY to 20 mV DIV Adjust Test Analyzer LINEAR SENSITIVITY Vernier control for a full eight division display Refer to Figure 4 3 Tune Test Analyzer FINE TUNE so that the upward slope of the display intersects the CENTER FREQUENCY graticule line one division from the top NOTE The linear portion of the analyzer IF filter skirt is used to slope detect low order residual FM The analyzer is stabilized and the detected FM is displayed in the time domain Note where the slope i
54. front panel TRACK ADJ control to compensate for minor frequency variations of the second and fourth local oscillators in the spectrum analyzer The power level of the tracking generator rf output is controlled by an ALC circuit The ALC detector is part of a large scale integrated LSI circuit package containing an attenuator low pass filter output amplifier and a dc blocking capacitor The detected signal is applied through a amplifier to PIN diode modulators in the third LO signal path to the tracking generator first converter rf output level is adjustable over 0 to 10 dBm range by a front panel LEVEL control in the dc amplifier circuit The LEVEL control is calibrated at 0 dBm Figure 8 7 contains a block diagram of the tracking generator with interconnections to both the 8554L and 8555A Spectrum Analyzer Systems The first LO inputis applied through isolators and a 2 0 to 3 4 GHz bandpass filter to the second converter The third LO input is applied through a 500 MHz limiter amplifier and PIN diode modulators to the second converter The 500 MHz third LO signal is combined with the output from the 1 55 GHz cavity oscillator The output from the first converter has a center frequency of 2 05 GHz with a tuning range of 2 MHz plus the deviation of the 500 MHz signal from the analyzer The 2 05 GHz first converter output is mixed with the 2 05 to 3 4 GHz output from the bandpass filter in the second converter The second conv
55. in manual revisions or reprints SECTION VIII SERVICE includes all infor mation required to service the instrument 1 5 SAFETY CONSIDERATIONS 1 6 General 1 7 This is an International Electrotechnical Com mission Safety Class I instrument This instrument has been designed and tested according to IEC Pub lication 348 Safety Requirements for Electronic Measuring Apparatus and has been supplied in safe condition 1 8 Operation 1 9 BEFORE APPLYING POWER make sure the instrument s ac input is set for the available ac line voltage that the correct fuse is installed and that al normal safety precautions have been taken 1 10 Service 1 11 Although the instrument has been designed in accordance with intemational safety standards the information cautions and warnings in this manual must be followed to ensure safe operation and to keep the instrument safe Service and ad justments should be performed only by qualified service personnel 1 12 Adjustment or repair of the opened instru ment with the ac power connected should be avoided as much as possible and when inevitable should be performed only by a skilled person who knows the hazard involved 1 13 Capacitors inside the instrument may still be charged even though the instrument has been disconnected from its source of supply 1 14 Make sure only fuses of the required current rating and type normal blow time delay etc are used for replacement
56. inch open a HP 8720 0030 Wrench 15 64 inch open HP 8710 0946 PROCEDURE It is assumed that the Tracking Generator Spectrum Analyzer did not perform as called out in the Preset Adjustment Procedure in Paragraph 4 7 or 4 9 Set Tracking Generator controls as follows LINE MANUAL SCAN SR WE Centered LEVEL seas ou ab ae tee et eo Od Bm HP 8444A Tracking Generator max Remove top cover and check 20 and 10 volt power supplies at feedthru capacitors A4C1 and 4 2 Check for a level of 20 20 mV and 10 05 Vdc YES Apply power to the Spectrum Analyzer System and set controls as follows n 1 2 05 GHz IF 500 MHz 300 kHz FREQUENCY BANDWIDTH SCAN WIDTH SCAN WIDTH PER DIVISION INPUT ATTENUATION TUNING STABILIZER SIGNAL IDENTIFIER BASE LINE CLIPPER VIDEO FILTER SCAN TIME PER DIVISION 10 MILLISECONDS LOG LINEAR 1048 LOG LOG REF LEVEL LOG REF LEVEL Vernier SCAN MODE SCAN TRIGGER 8555A Section only YES Disconnect cable between FIRST LO OUTPUT and FIRST LO INPUT at the Tracking Generator Using the BNC adapter 10 dB attenuator thermistor mount and power meter check for a first LO power level of 10 3 dBm YES Reconnect first LO cable Disconnect third LO cable at THIRD LO INPUT Check thir
57. kHz Rotate TRACK ADJ control fully clockwise and record oscillator frequency 1 552 000 500 kHz Record frequency tuning range frequency recorded in step 9 minus frequency recorded in step 8 4 000 500 kHz If data recorded in steps 6 8 9 and 10 is within tolerance no adjustment is required If power level recorded in step 6 is less than 5 dBm proceed to step 23 If data recorded in steps 8 9 or 10 is not within tolerance proceed with step 14 Connect Digital Voltmeter to test point A2TP5 Set TRACK ADJ control fully clockwise Set TUNE potentiometer A2R26 fully counterclockwise Adjust MIN TUNE potentiometer A2R27 to set voltage at test point A2TP5 to level indicated on oscillator label See steps 23 through 30 for method of obtaining voltage level Measure and record oscillator frequency Adjust MAX TUNE potentiometer to increase oscillator frequency 4 000 50 kHz above frequency recorded in step 17 Record oscillator frequency Set TRACK ADJ contro to center of tuning range recorded in steps 17 and 18 above Re cord oscillator frequency If frequency recorded in step 19 is not within 500 kHz of 1 550 GHz adjust 1 to tune oscillator frequency to 1 550 GHz 100 kHz If oscillator frequency is adjusted repeat steps 15 through 20 Repeat steps 4 through 11 above If power level recorded in step 6 is less than 5 dBm connect Power Meter as indicated in step 4 Remove right side panel
58. near body of defective component remove compo nent and straighten leads left in board Wrap leads of replacement component one turn around original leads Solder wrapped connection and clip off excess lead 8 23 GENERAL SERVICE INFORMATION 8 24 Transistors and diodes are used throughout the RF Section in circuit configurations such as de lay circuits trigger circuits switches oscillators and various types of amplifiers Basic transistor opera tion is shown on the following pages 8 25 Transistor In Circuit Testing The common causes of transistor failure are internal short cir cuits and open circuits In transistor circuit testing the most important consideration is the transistor base to emitter junction The base emitter junction in a transistor is comparable to the control grid Table 8 4 Etched Circuit Soldering Equipment dem Soldering tool Unsoldering Soldering Tip Soldering Unsoldering p remove molten solder from Suction device Soldapult by Edsyn Co connection Arleta California Resin flux Remove excess flux from soldered area before applica tion of protective coating Solder Component replacement Circuit board repair Wiring Protective Coating Contamination corrosion protection Wattage rating 4714 56 Tip Temp 850 900 degrees Shape pointed Must not dissolve etched circuit base board material or conduc tor bonding agent Good electri
59. on CRT display at the 5 graticule line 50 MHz Set LEVEL control for the deviation from the 1 dBm reference level recorded in step 16 above Rotate Tracking Generator MANUAL SCAN control to tune Spectrum Analyzer between 50 and 300 MHz Note and record maximum Power Meter deviation from the 1 dBm reference level dB Tune Spectrum Analyzer and Frequency Counter to 0 8 GHz 15 MHz Set Spectrum Analyzer SCAN WIDTH to 100 MHz PER DIVISION Rotate Tracking Generator MANUAL SCAN control to tune Spectrum Analyzer between 300 and 1300 MHz Note and record maximum Power Meter deviation from the 1 dBm reference level dB NOTE Perform the following performance checks using 8554B RF Section in the Spectrum Analyzer System 4 5 HP 8444A Tracking Generator max Performance Tests Model 8444 PERFORMANCE TESTS 4 16 Output Level cont d 29 30 31 32 33 34 35 36 37 38 Connect Tracking Generator AUX RF OUTPUT to Frequency Counter AC input Set Spectrum Analyzer SCAN WIDTH to 2 MHz PER DIVISION Center dot on CRT display with Tracking Generator MANUAL SCAN control Tune Spectrum Analyzer FREQUENCY control for indication of 10 MHz 100 kHz on Frequency Counter Set Tracking Generator LEVEL control to 0 dBm Measure and record 10 MHz power output level and deviation from 0 dBm Power output dBm Deviation Connect Ac Voltmeter to Tracking Generator RF OUTPUT Term
60. output of the wideband amplifier is applied through a level detector circuit and a 1 4 GHz low pass filter to the RF output connector The level of the RF output is sampled and applied to the modulator PIN diode driver as the RF diode signal A reference signal controlled by the front panel LEVEL control and the internal 0 and 10 dBm adjustments is applied through second diode in the level detector circuit to the modulator driver The level of the reference signal and the ALC circuitry is adjusted to provide an output level of 0 to 10 dBm n LEVEL CONTROL CIRCUITRY level control circuit 15 a resistive divider network that establishes the level of the reference diode signal The front panel LEVEL control adjusts the reference signal level to the ALC circuitry to provide control of the RF output level range of 0 to 10 dBm Refer to paragraph 5 13 for calibration of the 0 and 10 dBm points TROUBLESHOOTING PROCEDURE Except for the ALC level control circuitry refer to Service Sheet 2 for troubleshooting procedure EQUIPMENT REQUIRED Spectrum Analyzer System HP 8554B or 8555A System Digital Voltmeter HP 34440A 34443A HP 8444A Tracking Generator max 8444 Figure 8 14 2 Modulator Oscillator Driver Assy Component Location HP 8444A Tracking Generator max SECOND I SOLATOR ATI 2 3 4 GHz FILTER ISOLATOR AT EQUIVALENT
61. paragraph 4 9 Perform the preset adjust ment procedures for the appropriate system prior to accomplishing the performance tests Procedures for verifying that the instruments meet specifica tions are given in paragraphs 4 16 through 4 20 4 3 EQUIPMENT REQUIRED 4 4 Test equipment and accessories for perform ance P adjustment A and troubleshooting T are listed in Table 1 3 Critical specifications and or required features for the test equipment and accessories are contained in the table Each per formance test lists the required test equipment and contains an illustrated test equipment setup 4 5 FRONT PANEL CHECKS 4 6 Before proceeding to the performance tests the instruments must be adjusted and all controls set as specified in the preset adjustment procedures for the appropriate system 8554B 8555A The instruments should perform as called out in the preset adjustment procedures before going on to the performance tests 4 7 Preset Adjustments 8554B 8552B 141T 8444A System 4 8 Procedure a Apply power to Tracking Generator and Spectrum Analyzer b Turn Spectrum Analyzer INTENSITY control fully CCW c Allow instruments to warm up for at least 30 minutes d Perform Spectrum Analyzer 30 cali bration procedure Refer to 8554B RF Section Operating Manual e Connect Spectrum Analyzer FIRST LO OUTPUT to Tracking Generator FIRST LO INPUT f Connect Spectrum Analyzer THIRD LO OUTPUT to
62. repair or component replacement BI POLAR TRANSISTORS BLACK EPOXY PLASTIC TRANSISTORS ECB METAL CASE TRANSISTORS DUAL Figure 8 2 Examples of Diode and Transistor Marking Methods 8 6 HP 8444A Tracking Generator max Model 84444 Service A B GAIN 1 GAIN 1 RUR2 INPUT OUTPUT OUTPUT INPUT IMPEDANCE VERY HIGH OUTPUT IMPEDANCE VERY LOW D GAIN R1 R2 OUTPUT INPUT INPUT IMPEDANCE R2 OUTPUT IMPEDANCE VERY LOW IF A IS LARGE V R1 R1 T LE V2 gl 2 0 THEN Vg V BL 2 977 82 3 IF V4 0 THEN Figure 8 3 Operational Amplifier Equivalent Circuit 8 7 8 8 HP 8444A Tracking Generator max Model 8444 5 WE 8 J8 AT3 4 Al w4 A6 W10 w3 w12 w13 w2 wi w Figure 8 4 Major Assembly Locations 1 of 2 HP 84444 Tracking Generator max xa2 1 51 Figure 8 4 Major Assembly Locations 2 of 2 HP 8444A Tracking Generator max Service 5 ADJ2 A2R26 TUNE A2R27 MIN TUNE A2R41 0dBm LEVEL A2R40 10 dBm LEVEL 1814 VOLTS A2R17 NULL ADJ A2R7 GAIN ADJ A2R6 LIMIT SET R1 TRACK LEVEL MANUAL ADJ SCAN Figure 8 5 Adjustment and Test Point Locations HP 8444A Tracking Generator max 10 ar
63. 0 volt unregulated source to series regulator Q1 At initial tum on driver transistor A1Q3 and current source A1Q1 Q2 provide a 14 5 volt signal to the base of Q1 resulting in an output of approximately 13 8 volts The low output voltage is sensed by sense amplifier 101 which then provides the additional turn on signal to driver A1Q3 Adjustment of the 20 volt output is provided by VOLTS adjustment A1R14 Fold back current limiting is provided by A1Q4 with over current protection provided by 1 Over voltage for both the 20 and 10 volt supplies is provided by circuit consisting of A1CR8 CR10 195 Should either supply exceed the breakdown voltage of the diodes the silicon controlled rectifier is triggered on shorting the output of both supplies together Diodes A1CR6 and CR7 provide reverse voltage protection A1R9 and the front panel MANUAL SCAN control R1 provide the 0 to 10V output for MANUAL SCAN operation 10 VOLT POWER SUPPLY The 10 volt supply consists of bridge rectifier A1CR12 CR15 filter C2 series series regulator Q2 driver 107 fold back current limiter A1Q6 and sense amplifier A1U2 The unregulated output of the bridge rectifier is filtered by C2 and regulated by Q2 20 volts from the positive supply provides the reference for the sense amplifier A1U2 Precision resistors between the 20 volts and the 10 sense line reference the negative supply to the positive supply Th
64. 000 80 20 CER CONNECTOR 50 COUPLING LO OUTPUT R FXD 31 6 OHM 2 05W OSCILLATOR ASSEMBLY 500 MHz C FXD 3 9PF 25PF 500WVDC CER C VAR 1 9 8 5PF AIR INDUCTOR 500 MHz OSC TRANSISTOR NPN TRANSISTOR NPN R FXD 422 OHM 1 1 8W 1K OHM 1 1 8W R FXD 1K OHM 196 1 8W POWER SUPPLY FILTER ASSEMBLY 01 UF 80 20 100WVDC CER C O1UF 80 20 100WV DC CER C FXD 20UF 75 10 SOWVDC AL C FXD 20UF 75 10 50WVDC AL DIODE SWITCHING 2NS 30V SOMA DIODE SWITCHING 2NS 30V SOMA TRANSISTOR NPN TRANSISTOR NPN R VAR 5K OHM 5 WW R FXD 4 64K OHM 1 1 8W R FXD 4 64K OHM 1 1 8 1 96K OHM 1 1 8W R FXD 464 OHM 1 1 8W CABLE COAX 500 MHz OUTPUT HP 8444A Tracking Generator max Model 8444A Mfr Part Number 08444 60024 0160 2357 0160 2357 1250 0828 08554 00015 C3 1 8 TOO 31R6 G 08444 60020 0160 2247 189 253 5 MODIFIED 08554 00007 1854 0323 1854 0323 C4 1 8 TO A22R F C4 1 8 TO 1001 F 4 1 8 1001 08444 60031 0160 2055 0160 2055 300206G050CC2 300206G050CC2 1901 0040 1901 0040 1854 0404 1854 0404 2100 1775 C4 1 8 TO 4641 F C4 1 8 TO 4641 F C4 1 8 TO 1961 F C4 1 8 TO 4640 F 08444 60025 Model 8444 Appendix D D 14 SECTION VIII SERVICE D 15 Description of Option 058 two transistor 500 MHz fixed tuned local oscillator with power supply processing circuits A
65. 000 PF 80 20 0160 2357 2 0150 2357 CER FEED THRU 1000 PF 80 20 0160 2357 403 0160 2152 C FXD CER 10 PF 204 500VDCW 0160 2152 AS JI 1250 1220 CONNECTOR RF 50 UHM SCREW ON TYPE 50 051 0109 442 1250 1220 CONNECTOR RF 50 OHM SCREW ON TYPE 590 051 0109 6 5 HP 8444A Tracking Generator max Replaceable Parts Table 6 2 Replaceable Parts Reference HP Part Number Designation AGMPL 08444 00006 AGMP2 08444 20011 AGAL 08444 60005 AGALCI 0160 2266 AGALC2 0160 5556 AGALC3 0160 2266 AGALC4 0160 2266 AGALCS 0160 2266 AGALCS 0160 0066 AGALCT 0160 2266 AGALC8 0160 2266 1 9 0160 2266 AGALC1O 0160 2266 AGALCLL 0160 2266 1901 0639 ASALCR2 1901 0639 AGALLI 9100 2252 AGALL2 9100 2252 AGALL3 9100 2252 AGALL4 9100 2252 AGALQL 1854 0345 AGALQ2 1854 0345 AGALQ3 1854 0345 AGALRI 0698 7197 AGALR2 0698 7 236 0698 7236 AGALRS 0698 7236 0698 1236 AGALRO 0698 7 236 AGALRT 0698 7236 0698 7236 4183 0698 7236 ASALRIO 0698 7236 AGALRIL 0698 7214 A ALTBL 08444 20005 A5 08444 60011 ASSL 1250 0829 A5J 1250 0829 A545 1250 0829 08555 00033 A5MP2 0516 0005 A5MP3 2200 0111 4 08555 20035 5 5 08444 20012
66. 020 M RIB TRITT 0 Vdc A 420 V WS 7 19 7V 9 4V 19 CR3 9 9 V R25 Ovde 10V 10K R10 LC4 00 10 15 10V REFERENCE DESIGNATIONS WITHIN OUTLINED 19 9 V PIO T ys 100 9 AV T 1854 0071 FIRST CONVERTER ASSY 5 08444 60011 W6 4TO 14 dBm R22 100 WO C8 2700pF ASSEMBLIES ARE ABBREVIATED FULL DESIGNATION IN CLUDES ASSEMBLY NUMBER e g OF ASSEMBLY Al DESIGNATIONS OF OTHER COMPONENTS ARE 15 AIRI COMPLETE AS SHOWN HP 8444A Tracking Generator max FIRST CONVERTER 55 5 08444 60011 w 9 A lt o 4 4TO 2 05 GHz 7 dBm 17 dBm AT3 ISOLATOR gt 22 1 55 GHz ac ASSY A7 a 60019 NOTES 916 1 SEE SCHEMATIC DIAGRAM H 5 NOTES TABLE 8 3 2 CHASSIS GROUND ADJACENT TO OSCILLATOR ASSY REFERENCE DESIGNATIONS ___ Sg _ P O ie 5 91 1 W5 6 7 8 9 13 P O 82 5 10 1 5 Vdc R5 5 5110 Se 2 10V 3 Figure 8 12 First Converter Circuits Schematic Diagram 8 15 TONS WITHIN OUTLINED REVIATED FULL DESIGNATION IN UMBER e g OF ASSEMBLY Al ONS OF OTHER COMPONENTS ARE HP 8444A Tracking Generator max Model 8444 MP1 OPTION 005 2 Figure 8 13 RF Output Connector
67. 1 and or in the data spaces provided in each test 4 13 The tests are arranged in the following order Paragraph Test Description 4 16 Output Level 4 17 Frequency Stability 4 18 System Flatness 4 19 Frequency Accuracy 4 20 Distortion 4 14 Each test is arranged so that the specifica tion is written as it appears in the Table of Specifications Table 1 1 in Section I Next a description of the test and any special instructions or problem areas are included Each test that requires test equipment has a test setup drawing and a list of required equipment Each procedure gives control settings required for that particular test HP 8444A Tracking Generator max Model 8444A Performance Tests 4 15 Required minimum specifications for test specifications listed in order to performance test equipment are detailed in Table 1 3 in Section I If the Tracking Generator substitute test equipment is used it must meet the PERFORMANCE TESTS 4 16 Output Level SPECIFICATION Tracking Generator Drive Level to Test Device 0 to 10 dBm continuously variable 0 dBm calibrated to 50 5 dB Flatness 0 5 dB DESCRIPTION With the Tracking Generator connected to the Spectrum Analyzer the Tracking Generator output level is first checked at 30 MHz Spectrum Analyzer amplitude calibration point with a Power Meter The output level is then checked at 10 MHz low frequency end of 8555A RF Section tuning range then over the 10 MHz to 50 M
68. 27 Vac General Radio or Superior Electric UCIM A T Output Voltage Variable 0 20 Vdc Output Current 0 200 mA Meter Accuracy 3 Control Fine adjustment De Volt Ohm Ammeter HP 6205B Power Supply A T Voltmeter Voltage Range 1 mV 50 Vde Accuracy 1 Input Resistance 10 megohms Ammeter Current Range 1 mA 200 mA Accuracy 2 Ohmmeter Resistance Range 1 ohm 100 megohm Accuracy 5 reading at center scale Coaxial Attenuator HP 412A Volt Ohm Ammeter Frequency Range DC 4 GHz Flatness 502 dB HP 8491 Option 10 Adapter BNC Tee Adapter BNC Female to Type N Male UG 274B U HP 1250 0781 UG 201A U HP 1250 0067 Cable Assembly Coaxial cable with Male BNC connectors 48 inches long HP 10503A Cable Assembly Coaxial cable terminated with BNC Male connector and with probe and alligator clip HP 10501A Cable Assembly Coaxial cable terminated with BNC Male connector and alligator clips HP 10501A Cable Assembly Coaxial cable terminated with dual banana plug and probe with alligator clip HP 11003A Cable Assembly Coaxial cable with dual banana plug and Male BNC connector terminations Cable Assembly Cable Assembly HP 11001A SMA Male to BNC Male HP 08555 60076 Selectro Female to BNC Male Test Cable 36 inches long HP 11592 60001 C
69. 316 OHM 1 1 8W 28480 0698 3444 A2R9 0598 3156 FLM 14 7K OHM 1 1 8H 28480 0698 3156 0757 0346 FLM 10 OHM 1 1 8W 28480 0757 0346 A2R11 0698 3154 R FXD MET FLM 4 22 OHM 1 1 8W 28480 0698 3154 A2R12 0757 0346 R FXD FLM 10 OHM 13 1 8W 28480 0757 0346 2 13 0698 3454 FLM 215K OHM 13 1 8W 28480 0698 3454 A2R14 0757 0424 R FXD FLM 1 10K OHM 1 1 84 284 80 0757 0424 2 15 0698 3437 R FXD MET FLM 133 OHM 1 1 8W 28480 0698 3437 A2R16 0757 0817 FLM 750 OHM 1 1 2 28480 0757 0817 2 17 2100 1758 R VAR WW 1K OHM 5 TYPE V 14 28480 2100 1758 2818 0698 3445 FLM 348 OHM 1 1 84 284 80 0698 3445 2819 0757 0401 R FXD FLM 100 OHM 1 1 8W 28 80 0757 0401 A2R20 0751 0416 FLM 511 OHM 1 1 8W 28480 0757 0416 A2kel 06 98 3450 FLM 42 2K OHM 14 1 8W 28480 0698 3450 2 22 0757 0401 R EXD FLM 100 OHM 1 1 8W 28480 0757 0401 2823 0757 1094 FLM 1 47 OHM 1 1 8W 28480 0757 1094 A2R24 0757 0424 R FXD MET FLM 1 10 GHM 1 1 8W 284 0757 0424 A2R25 0698 3441 R FXD FLM 215 OHM 1 1 84 28480 0698 3441 A2R26 2100 2522 R VAR CERMET LOK OHM 10 LIN 1 28 28480 2100 2522 2821 2100 1758 R VAR WW 1K OHM 5 TYPE V 1W 28480 2100 1758 A2k 28 0757 0442 FLM 10 0K DHM 1 1 84 284 80 0757 0442 2 29 0757 0 55 MET FLM 100K OHM 1 1 8W 28480 0757 0465
70. 4 Tel 2355 Telex HPSG RS 21486 Cable HEWPACK Singapore SOUTH AFRICA Hewlett Packard South Ltd Private Bag Wendywood Sandton Transvaal 2144 Hewlett Packard Centre Daphne Street Wendywood Sandton 2144 802 1040 8 Telex 8 4782 Cable HEWPACK Johannesburg Hewlett Packard South Africa Ltd P O Box 120 Howard Place Cape Province 7450 Pine Park Centre Forest Pinelands Cape Province 7405 Tel 53 7955 thu 9 Telex 57 0006 TAIWAN Hewlett Packard Far East Ltd Taiwan Branch 39 Chung Hsiao West Road Section 1 7th Floor Taipei Tet 3819160 4 3141010 2715121 Ext 270 279 Cable HEWPACK TAIPEI Hewlett Packard Fae East Ltd Taiwan Branch 58 2 Chung Cheng 3rd Road Kaohsiung 07 242318 Kaohsiung Analytical Only San Kwang Instruments Lid 20 Hung Sut Road al Pf 5 lines Telex 22894 SANKWANG Cable SANKWANG TANZANIA Medical international Aeradio Ltd Box 861 Dar es Salaam Tel 21251 Ext 265 Telex 41030 THAILAND UNIMESA Co Ltd Research Building 2538 Sukumvit Ave Bangchak Bangkok Tet 3932387 3930338 Cable UNIMESA Bangkok UGANDA Medical Only International Aeradio E A Ltd Box 2577 Kampala Tel 54388 Cable INTAERIO Kampala ZAMBIA Tilbury Zambia Ltd P O Box 2792 Lusaka Tel 73793 Cable ARJAYTEE Lusaka OTHER AREAS NOT LISTED CONTACT Hewle
71. 43A Plugin HP 3440A PowerSupply HP 62058 Test Leads dual banana plug to probe and alligator 11003A Cable Assy SMA male to BNC male 08555 60076 Cable Assy male BNC connectors HP 10503A Coaxial Attenuator Option 010 2 5 5 5 8491A Adapter BNC barrel HP Part Number 1250 0080 2 5 5 5 UGO914A U Adapter BNC to 0 UG201A U PROCEDURE Perform Power Supply Check and Adjustment paragraph 5 8 Apply power to Tracking Generator and allow 1 hour for instrument to warm up and stabilize Disconnect Cable W8 at Isolator J2 see Figures 8 4 and 8 12 With test setup as indicated in Figure 5 2 connect Power Meter to Isolator AT3 J2 via 08555 60076 cable 10 dB attenuator and UG 914A U adapter Rotate TRACK ADJ control throughout its tuning range while noting power level indicated on Power Meter Se i ee A RSS PP AREAL STIS HP 8444A Tracking Generator max Manual Changes Model 8444A 5 9 1 55 GHz Oscillator Power Level Frequency Check and Adjustment cont d 6 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Record minimum power output gt 5 dBm Connect Frequency Counter to Isolator AT3 J2 via 08555 60076 cable UG 914A U adapter and BNC to BNC cable Rotate TRACK ADJ control fully counterclockwise and record oscillator frequency 1 548 000 500
72. 44 v E H A N G 0 ViANUAL TRACKING GENERATOR 8444 P f THIS MANUAL CONTAINS SUPPLEMENT FOR A SPECIAL MODIFICATION TO THE INSTRUMENT SEE INSIDE COVER HEWLETT A PACKARD HP 8444A Tracking Generator max Yobe dH This instrument has been designed and tested according to IEC Publication 348 Safety Requirements for Electronic Measuring apparatus and has been supplied in safe condition This is a Safety Class 1 instrument To ensure safe operation and to keep the instrument safe the information cautions and warnings in this manual must be heeded Refer to Section I for general safety considerations applicable to this instru ment CERTIFICATION The Hewlett Packard Company certifies that this instrument was thoroughly tested and inspected and found to meet its published specifications when it was shipped from the factory The Hewlett Packard Company further certifies that its calibration meas urements are traceable to the U S National Bureau of Standards to the extent allowed by the Bureau s calibration facilities or to the calibration facilities of other Interna tional Standards Organization members WARRANTY AND ASSISTANCE This Hewlett Packard product is warranted against defects in materials and work manship This warranty applies for one year from the date of delivery Hewlett Packard will repair or replace products whi
73. 444A when it is coupled to an 8558B 180 Spectrum Analyzer system D3 DESCRIPTION D4 To provide a tracking signal for an 8555A 8552 140 Spectrum Analyzer an 8444A Tracking Genera tor must be fed a 2 05 to 4 1 GHz tuned oscillator signal from the 8555A First LO plus a 500 MHz signal from the 8555A Third LO When mixed with the internal 1 55 GHz oscillator in the 8444A a 0 5 to 1300 MHz tracking signal output is produced D5 To develop a 0 5 to 1300 MHz tracking signal for an 8558B 180 Spectrum Analyzer Display system a 2 05 to 3 55 GHz First LO is available from the 8558B but no 500 MHz LO is used in this instrument Option 058 consists of a 500 MHz oscillator for the 8444A This 500 MHz signal is brought out on a sepa rate BNC connector on the rear panel of the 84444 directly above the THIRD LO INPUT BNC connector When the 8444A is used with an 8558B 180 Spectrum Analyzer system the two rear panel BNC con nectors are interconnected with a short BNC cable With the First LO from the 8558 B plus its own 500 MHz LO signal the 8444A can provide 0 5 to 1300 MHz tracking signal for the 8558B Spectrum Analyzer system D6 MANUAL CHANGES TO INCORPORATE OPTION 058 D7 Section 1 D8 84444 System Specifications with Option 058 added are listed in Table D 1 Table D 1 8444A System Specifications with Option 058 SPECIFICATIONS These specifications apply to the 8444A Option 058 when used with the 8558 Spectrum Analyzer ONLY Specific
74. 46 A2C5 0180 0374 C FXD TANT 10 UF 10 20V0CW 56289 150D106X9020B2 DYS 2 8 0160 2208 C FXD MICA 330 PF 52 300VDCW 28480 0160 2208 A2CT 0180 0374 C FXD TANT 10 UF 10 20VDCW 56289 150D106X9020B2 DYS A2C8 0160 0300 MY 0 0027 UF 10 200VDCW 56289 292 27292 5 A2CA1 1901 0040 DIODE SILICON 30MA 30V 07263 061088 2082 1901 0040 0100 5111 0 07263 061088 A2CR3 1901 0040 DIODE SILICON 30MA 07263 FDG1088 A201 1854 0221 TSTR SI NPN REPL BY 2N4044 28480 1854 0221 A222 1853 0020 518 51 PNP SELECTED FROM 2 3702 28480 1853 0020 A203 1853 0020 5 PNP SELECTED FROM 2N3702 28480 1853 0020 423 1853 0020 TSTR SI PNP SELECTED FROM 243702 28480 1853 0020 A205 1853 0020 5 51 PNP ISELECTEO FROM 2N3702 28480 1853 0020 A295 1854 0CTl TSTR SI NPN SELECTED FROM 2N3704 28480 1854 0071 207 1853 0020 TSTR I PNP SELECTED FROM 2N3702 28480 1853 0020 A208 1853 0012 578 51 PNP 80131 2N2904A 2 1 0757 0346 R FXD FLM 10 OHM 17 1 8W 28 80 0757 0346 AZR2 0698 3454 R FXD MET FLM 215K OHM 1 1 8W 284 80 0698 3454 4283 0757 0280 1K OHM 13 1 8W 28480 0757 0280 A2R6 0757 0280 MET FLM 1K OHM 1 1 88 28480 0757 0280 A2R5 0757 0438 FLM 5 11K OHM 1 1788 284 0757 0438 A2R5 2100 1760 R VAR WM 5K OHM 5 TYPE V 1M 28580 2100 1760 287 2100 1760 VAR WW 5K OHM 5 TYPE V 14 28480 2100 1760 2 8 0698 3444 FLM
75. 5 R FXD MET FLM 31 6 OHM 1 1 8W A2R36 0757 0442 FLM 10K OHM 1 1 8W A4A1C2 0160 2266 C FXD CER 24PF 5 500 VDCW 72982 301 000 COGO 240J 08444 60003 OSCILLATOR ASSY 1 55 GHz RECOMMENDED FOR FIELD REPAIR 0160 8549 C FXD PORC 0 5 0 1 PF 500 VDCW 28480 0160 3549 Delete A7C4 1 0698 7205 R MET FLM 51 1 OHM 2 1 8W Delete C3 Delete R5 Page 8 15 Figure 8 12 Service Sheet 3 Replace with Figure 7 2 Page 8 21 Figure 8 19 Replace with Figure 7 3 7 4 HP 8444A Tracking Generator max Manual Changes Model 8444A S1H3MOdMOD 40 lv 70 364 40 MOlvwOIS3Q VWA QilviA3NGGY 53179557 Q3M TINO SNOLLYNSISIO sv wx p 10 1768299 142 5155 3 2182 zc 1220 9681 56 00 10 30010 yv 843 1 SNOILWNOIS 30 39343339 ASSY NOiYTII2SO 01 GNNOYD SISSVHO 72 1 8 31891 SILON WYHOVIO 211VW340S 33501 E wave ET 2 i DOs 0 7 8009 9980 LV ASSY 301911150 SS I Ox ot WEP 1 aM 6
76. 5146 HEWPACK Cable HEWPACK Caracas FOR AREAS NOT LISTED CONTACT Hewlett Packard nter Americas 3200 Hillview Ave Palo Alto Cahtornia 94304 415 856 1501 PABLO FERRANDO TELEFONO TWX 910 373 1260 40 31 02 Cable RADIUM Montevideo Cable HEWPACK Palo Alto Telex 034 8300 034 8493 878 cmm 21046797 vd wo Y 21 3 7 M x oF 4 v 22 HEWLETT PACKARD 0050 MP PART 08444 90012 PRINTED IN U S A 22232 OMIT IHR IE ibe ar hs pr 5425 110122 22 i T AS 2 8444 Tracking Generator max
77. 55 RF Section only 3 Disconnect the cable between Tracking Generator RF OUTPUT and Spectrum Analyzer INPUT 4 Connect cable between Tracking Generator RF OUTPUT and the INPUT of the Test Analyzer 5 Observe the Analyzer display for harmonic and spurious signals A typical display is shown in Figure 4 7 The Tracking Generator fundamental signal is shown between the 2 and 1 graticule lines The second harmonic is shown between the 1 and 2 lines with the third harmonic shown between the 4 and 5 lines The amplitude of the second harmonic is approximately 36 dB below the fundamental The third harmonic is down approximately 50 dB A spurious signal with an amplitude of approximately 58 dBm is shown between the 4 and 3 graticule lines 6 Changethe Tracking Generator Spectrum Analyzer System controls as follows Tracking Generator aoc med egest 10 dBm CCW Spectrum Analyzer FREQUENCY 2 250 SCAN WIDTH DIVISION 50 MHz SCAN TIME PER DIVISION 22 1 SECOND 7 Replace the Test Analyzer RF Section with either 8554B or 8555A RF Section 4 14 HP 8444A Tracking Generator max Model 8444 Performance Tests PERFORMANCE TESTS 4 20 Harmonic Distortion cont d 8 Set Analyzer controls as follows a
78. 8 Disconnect W9 cable at A5 43 and connect 11592 60001 cable between 5 J3 and Spectrum Analyzer INPUT 9 Select Spectrum Analyzer n 1 550 MHz IF BAND and adjust FREQUENCY control for dial indication of 2050 MHz 10 Set Spectrum Analyzer LOG LINEAR switch to LINEAR and adjust LINEAR SENSITIVITY controls to position signal peak between the 5 and 7 LIN graticule lines 11 Adjust A5 ADJ 1 1 55 GHz oscillator cavity for peak signal indication on CRT display 12 Alternately adjust A5 ADJ 2 and ADJ 3 2 05 GHz IF bandpass cavities for peak signal indication on CRT display 13 Repeat steps 11 and 12 above 14 Set Spectrum Analyzer SCAN WIDTH PER DIVISION to 1 MHz 15 Tune Tracking Generator TRACK ADJ through its tuning range while observing the CRT display 16 The passband should be similar to that dis played in Figure 5 6 If not set TRACK ADJ to center of passband and repeat steps 11 through 15 17 Set Spectrum Analyzer LOG LINEAR switch to LOG measure and record first converter output signal level 2 7 dBm 18 Install W9 cable between A5 J3 and A6 J2 Figure 5 6 First Converter CRT Display 5 10 HP 8444A Tracking Generator max 8444 Adjustments ADJUSTMENTS 5 12 Automatic Level Control ALC Check and Adjustment REFERENCE Service Sheet 3 DESCRIPTION The modulator driver functions as an operational amplifier in the ALC loop A 10 kHz signal is applied to the oper
79. 8444 8 OPERATING PROCEDURE WITH AN 8555A that the 115 230 switch is set to correspond with the available line voltage Refer to Figure 3 2 steps 4 through 8 for switch and fuse information Apply power to Tracking Generator and Spectrum Analyzer Tum Spectrum Analyzer INTENSITY control fully CCW Allow instruments to warm up for at least 30 minutes Perform Spectrum Analyzer Operational Adjust ments 30 MHz Calibration Refer to 8555A RF Section Operating and Service Manual Set Spectrum Analyzer LOG LINEAR control to LOG LOG REF LEVEL to 0 dBm and BAND WIDTH to 300 kHz Make the following interconnections between Track ing Generator and Spectrum Analyzer a FIRST LO INPUT to FIRST LO OUTPUT b THIRD LO INPUT to THIRD LO OUTPUT rear panel connections c RFOUTPUT to INPUT d SCAN OUTPUT to SCAN IN OUT Check that the Spectrum Analyzer controls are set as follows INTENSITY 12 o clock approx luisse Shed eae n 1 2 05 GHz IF FREQUENCY 30 MHz BANDWIDTH eR 300 kHz SCAN WIDTH PER DIVISION 100 kHz INPUT 20dB TUNING STABILIZER ON SIGNAL IDENTIFIER OFF BASE LINE CLIPPER CCW SCAN TIME PER DIVISION 10 MILLISECONDS Operation LOG LINEAR LOG
80. Analyzer 8553B 8552B 141T Section ello deu deel el 8554 8555 BNG Cables diesen QUE cU an dis HP 10503A sore eta A UG 201A U PROCEDURE 1 Perform preset adjustment procedures paragraph 4 7 for 8554B 8552 141T Spectrum Analyzer System or paragraph 4 9 for 8555A 8552 141T Spectrum Analyzer System 2 Connect test setup as indicated in Figure 4 6 and make the following control settings Tracking Generator Spectrum Analyzer System See paragraph 4 7 or 4 9 Spectrum Analyzer 8553B 8552B 141T Test Analyzer FREQUENCY ze MA Eur qure v WES 50 MHz BANDWIDTH ex Me gh ad PIE R49 Wo qos he GM 300 kHz SCAN WIDTH 52557 eth ux de eet ee E Neb ex DUOC S PER DIVISION SCAN WIDTH PER DIVISION 10 MHz n deos 20 dB BASE LINE CHIPPER ae es X ee 10 o clock XIDEO EIL DER 240455 Hot die doe NR vu werde OFF SCAN TIME PER DIVISION 2 MILLISECONDS EO LINEAR Sah dom BA wis 10 dB LOG HP 8444A Tracking Generator max 4 13 Performance Tests Model 8444 PERFORMANCE TESTS 4 20
81. Australia Ltd y 1 Street wick 2609 2733 52650 HEWPARD Canberra Packard Lto Sth Floor Teachers Union Building 495 499 Boundary Street Spring Hill 4000 Queensland Tel 229 1544 Cable HEWPARD Brisbane GUAM Medical Personal Calculators Only Guam Supply inc Ease Buikding Room 210 20 Box 8947 Tamuning 96911 Tet 546 4513 Cable EARMED Guam HONG KONG Schmidt amp Co Hong Kong Ltd 0 Box 297 Connaught Centre 39th Floor Connaught Road Central Hong Kot Tel 255291 5 Telex 74766 SCHMC HX Cable SCHMIDTCO Hong Kong INDIA Blue Star Ltd Kasturi Buildings Jamshedj Tata Rd Bombay 400 020 Tel 29 50 21 Telex 011 2156 BLUEFROST Blue Star Ltd Sahas 414 2 Vir Savarkar Marg Prabhadevi Bombay 400 025 Tel 45 7 87 Telex 011 4093 Cable FROSTBLUE Blue Star Ltd Band Box House Prabhadevi Bombay 400 025 Tei 45 73 01 Telex 011 3751 Cable BLUESTAR Blue Star Ltd 7 Hare Street 0 Box 506 Calcutta 700 001 Tei 23 0131 Telex 021 7655 Cable BLUESTAR Blue Star Ltd Bhandar House 7th amp Bth Floor 91 Nehru Place New Delhi 110 024 Tel 634770 amp 635166 Telex 031 2463 Cable BLUESTAR Blue Star Ltd Blue Star House 11 11A Magarath Road Bangatore 500 025 Tei 55668 Telex 043 430 Cable BLUESTAR Blue Star Ltd Meeakshi Mandram xxx 1678 Mahatma Gandhi Rd Cochin 682 016 Tel 32069 32161 32282 T
82. CL ERIE Bs Ont P O MODULATOR OSCILL 27 1 1501 DRIVER ASSY 2 _ 3 b 1 n lc Ton 1055 1248 T Ju 1 5 5 J2 V 10V 0 ADJ 1 EVEN mr Ine 41 WS 1 55 GHz 2 MHz 0 R PIN DIODE MODULATOR ASSY A4 7 dBm FIRST CONVERTER 55 5 20V REFERENCE LIMITER AMPL ALC RE DIODE PIN MODULATOR n H ATTENUATOR W6 500 MHz OUTPUT 1 4to Md amp im LOY Ye _____ 41 1 2 C P FR iP LEVELS EN ADJUST OF 8dBm 4 2 JTPUT LEVEL HP 84444 Tracking Generator max Service SOND CONVERTER ASSY 6 AMPLIFIER AND ALC DETECTOR ASSY AUX RF OUTPUT 71 Tubs WIE 1 3 GHz 26 48 AMPL ea Q 5 ONVERSION LOSS 7 dB LOW 0 l4GHz ATTENUATOR PASS LEVEL LOW PASS RF OUTPUT FILTER DETECTOR FILTER B i 1 di 2 20 724 5 25248454 2 17 dBm P O MODULATOR OSCI LLATOR NOTE 1 DRIVER ASSY A2 P O 948 20 V REFERENCE DIODE SIGNAL RF DIODE SIGNAL SCAN OUTPUT 20 V REGULATOR es 10 V REGULATOR 2 Figure 8 8 Tracking Generator Troubleshooting Block Diagram 8 13 HP 8444A Tracking Generator max SERVICE S
83. CLAMP FRONT PANEL TRIM 284B0 08445 00008 Table 6 3 Code List of Manufacturers MANUFACTURER ANDIESS U S A COMMON ANY SUPPLIER U S A AMP INC AIRCGAFT MARINE PROD HARRISBUR ALLEN BRADLEY MILWAUKEE WIS CORP BROADVIFM ILL RCA SOLID STATE RECEIVING TURE DIV SOMERVILLE SEMICONDUCTOR PROD INC ARIZ FAIRCHILD CAMEFA 6 INST CORP SEMICONDUCTOR 51V MOUNTAIN VIEW CALIF DICKSAN ELECTRONIC SCOTTSDALE ARIZ SPECTALTY CONNECTOR CO INC INDTANADDLTS IND AEWLETT PACKARD COMPANY PALO ALTO CALIF SPRAGUE ELECTRIC CO N ADAMS MASS BUSSMANN DIV GRAW EDISON CO ST L UTS 11308 MFG CO DIV TRW INC ELK GROVE VILLAGE TECHNOLOGICAL PPOD INC ERIE LITTELFUSE INC DES PLAINES Ttt ELECTPONIC INDUSTRIES ASSOCIATION WASHINGTON D C INDUSTRIES ANAHETM AUGAT INC ATTLFRORn MASS METHODF MFG ROLLING MEADOWS TEL FERNANDM MFG SAN CALIF SEALECTRO CORP MAMARONECK HP 8444A Tracking Generator max Model 8444 Service SECTION VIII SERVICE 8 1 INTRODUCTION 8 2 This section provides instructions for trouble shooting and repair of the HP Model 8444A Track ing Generator 8 3 PRINCIPLES OF OPERATION 8 4 Information relative to the principles of operation appears on the foldout pages opposi
84. DE IN USA Figure 1 2 Instrument Identification 1 18 DESCRIPTION 1 19 Model 8444A Tracking Generator is designed to complement both Model 8554B and Model 8555A Spectrum Analyzer RF Sections The Tracking Generator covers the frequency range of 500 kHz to 1250 MHz when used with the 8554B RF Section and from 10 MHz to 1 3 GHz when used with the 8555A RF Section The Tracking Generator Spectrum Analyzer functions as a system to perform frequency response meas urements Additionally the system can be used as a signal generator or sweeper to supply a test signal to other devices An auxilliary output is provided for precision frequency measurements by an exter nal frequency counter 1 20 The Tracking Generator converts the first and third local oscillator LO signals from the Spectrum Analyzer RF Section to a signal that tracks the frequency tuning of the RF Section With the Spectrum Analyzer operating in ZERO SCAN WIDTH the Tracking Generator is a CW signal generator tuned to the frequency of the analyzer In FULL or PER DIVISION SCAN WIDTH the Tracking Generator functions as a sweep oscillator which tracks the analyzer tuning Additionally a HP 8444A Tracking Generator max 8444 General Information Table 1 1 System Specifications These system specifications describe the performance available from the spectrum analyzer tracking generator system in various types of applications In all cases it i
85. Exploded View 8 16 HP 8444A Tracking Generator max SERVICE SHEET 4 cont d 5 See Service Sheet 2 Perform Preset Adjustment Procedures paragraph 4 7 or 4 9 Set Spectrum Analyzer SCAN WIDTH to ZERO Set Tracking Generator LEVEL to 0 dBm Measure voltage level at junction of the 958 98 and 948 wires with the connection pins of the A3 assembly Levels should be within 50 mVdc of the level listed below 50 mVdc 240 mVde 350 mVdc 10 dBm 300 mVdc 400 mVdc Note voltage drop across reference diode Typically 300 mVdc If voltage levels are not within 50 mVdc perform adjustment procedures in paragraph 5 12 and 5 13 and repeat measurement procedures above REMOVAL AND REPLACEMENT PROCEDURES See wiring detail for Amplifier and Detector Assembly A3 Microcircuits with serial numbers below 00100 have wires 98 and 958 reversed from units with serial numbers above 00101 Connect assembly according to wiring detail and serial number Replacement assemblies are shipped with ground clips installed on the rf diode and reference diode pins Remove clips from the replacement assembly and install on unit being returned for repair A2 A4 A4A1 5 1 A7 First Converter Circuits Schematic Diagram SERVICE SHEET 3 HP 8444A Tracking Generator max SERVICE SHEET 4 THEORY OF OPERATION Service Sheet 4 contains the schematic diagram for the first LO input circuit the second converter and the ampli
86. G LOG REF LEVEL 0 dBm LOG REF LEVEL Vernier 0 VIDEO SCAN SCAN TRIGGER LINE or AUTO j Set Tracking Generator controls as fol lows 4 2 Model 8444 MANUAL SCAN CCW eu oe Peas ae ee ud 0 dBm k Adjust TRACK ADJ control for maxi mum aplitude of trace on CRT display l If trace is not within 0 5 of LOG REF level graticule line repeat Spectrum Analyzer calibration procedure m Reconnect Tracking Generator RF OUT PUT to Spectrum Analyzer INPUT and adjust TRACK ADJ for maximum signal amplitude n Rotate LEVEL control fully counter clockwise 10 dBm and note signal level on CRT display 10 to 12 dBm If the signal level is off more than 0 5 dB at the 0 dBm point or not within 10 to 12 dBm with the LEVEL control fully counterclockwise re fer to paragraph 4 16 Output Level Performance Check and 5 13 for LEVEL control calibration procedure 4 11 PERFORMANCE TESTS 4 12 The performance tests given in this section are suitable for incoming inspection troubleshoot ing and or preventive maintenance During any performance test all shields and connecting hard ware must be in place The tests are designed to verify published specifications Perform the tests in the order given and record data on test card Table 4
87. HEET 3 THEORY OF OPERATION Service Sheet 8 contains the schematic diagram for the 500 MHz Amplifier PIN Diode Modulator Attenuator A4 the Modulator Oscillator Driver A2 First Converter A5 and the 1 55 GHz Oscillator A7 500 MHz AMPLIFIER PIN DIODE MODULATOR ATTENUATOR 4 The 500 MHz amplifier and PIN diode modulator consists of amplifier A4A1Q1 through and PIN diodes A4CR1 and CR2 The three stage amplifier provides isolation between the Tracking Generator attenuator and mixer circuits and the Spectrum Analyzer 500 MHz LO circuit The amplifier functions as a limiter in the forward direction of the 500 MHz signal while providing approximately 55 dB attenuation in the reverse direction This isolation prevents signals from the first mixer and changes in the 500 MHz signal by the PIN diode attenuator from affecting the 500 MHz oscillator in the Spectrum Analyzer PIN diodes A4CR1 and CR2 function as series connected current controlled microwave resistors As current through the diodes increases the amount of attenuation decreases Current through the PIN diodes is controlled by ALC circuitry and the output of Modulator Driver Assy A2 A4A1R11 is a limiter resistor to protect the PIN diodes in case of an accidental short to the line from the modulator driver MODULATOR DRIVER The modulator driver consists of differential amplifier A2Q1 through Q3 limiter A2Q4 and output amplifier A2Q5 through 97 The difference between the rf d
88. Hz range and then over the 50 MHz to 1 3 GHz range The output level is checked over the 500 kHz to 10 MHz for use with 8554B RF Section using an ac voltmeter calibrated to the 10 MHz Power Meter measurement reference THIRD to riJ RF E NUT 25 51 23 BNC CABLE STEP 20 FREQUENCY COUNTER D 357954327 m RF OUTPUT STER MOUNT BNC CABLE EQUIPMENT Spectrum Analyzer 8554B 8555A 8552B 141T Power Meter x vy Gia dede ed EU GL Soe BA ee A HP 432A Thermistot Mount WE hos E eee 8478 AC VolUmeter n zones weg y m onte IR es WE UE HP 400E Adapter BNC Eee s 2 4 dud tou se S UG 274B U Adapter Type N UG 201A U 2 each BNG Cables iad ev a ag et re aS HP 10503 2 each Frequency Counter s 4 xke hors mo ae Po HP 5245L Frequency Converter HP 5254C PROCEDURE 1 Perform preset adjustment procedures paragraph 4 7 for 8554B 8552 141T Spectrum Analyzer System or paragraph 4 9 for 8555A 8552 141T Spectrum Analyzer System 4 3 HP 8444A Tracking Generator max Performance Tests Model 8444A PERFORMANCE TESTS 4 16 Output Level cont d 2 10 11 12 4 4 Connect test setup as indicted in Figure 4 1 an
89. INE power switch Be very careful Bodily contact with this voltage can be fatal CAUTIONS BEFORE SWITCHING ON THIS IN STRUMENT make sure instrument s ac input is set to the voltage of the ac power source BEFORE SWITCHING ON THIS IN STRUMENT make sure that all devices connected to the instrument are con nected to the protective earth ground BEFORE SWITCHING ON THIS IN STRUMENT make sure the line power mains plug is connected to a three conductor line power outlet that has a protective earth ground Grounding one conductor of a two conductor out let is not sufficient BEFORE SWITCHING ON THIS IN STRUMENT make sure the ac line fuse is of the required current rating and type normal blow time delay etc 1 16 INSTRUMENTS COVERED BY MANUAL 1 17 Hewlett Packard instruments carry a serial number see Figure 1 2 on the back panel When 1 2 Model 8444A the serial number prefix on the instrument serial number plate of your instrument is the same as one of the prefix numbers on the inside title page of this manual the manual applies directly to the instrument When the instrument serial number prefix is not listed on the inside title page of initial issue manual change sheets and manual up dating information is provided Later editions or revisions to the manual will contain the required change information in Section VII SERIAL NUMBER PREFIX 311 1339400285 SUFFIX HEWLETT PACKARD MA
90. Oscillator Power Level Frequency Check and Adjustment paragraph 5 9 3 Apply power to Spectrum Analyzer System Frequency Comb Generator and Tracking Generator Allow at least one 1 hour for equipment stabilization 4 Disconnect Cable W4 at Mixer Assy A6 and Cable W8 at First Converter A5J2 see Figures 8 4 and 8 12 Connect 11592 60003 cable between W8 and A6 J1 5 Disconnect Cable W9 from A6 J2 and connect 11592 60001 cable between A6 J2 and Frequency Comb Generator 6 Disconnect Cable W10 from A6 43 and connect 11592 60001 cable between 43 and Spectrum Analyzer RF input 7 Set instrument controls as follows 5 6 HP 8444A Tracking Generator max 8444 Adjustments ADJUSTMENTS 5 10 1 55 GHz Oscillator Residual FM Check cont d 10 11 12 13 Tracking Generator EINE ORE ONS coss dye dee ae sb euo quio d s T mes ON TRACK ADd aia eme RES Centered Frequency Comb Generator COMB FREQUENCY 2 100 2 OUTPUT AMPLITUDE a Seca aE dee Maximum CW Spectrum Analyzer 21x ote he ce ae NS eg ON ee a 0 110 BREQUENCY 52 E SEINE 50 2 BANDWIDTH iiam avenge tote 30 kHz SCAN WIDTH V
91. RACK ADJ for 1 00 Vdc at A2TP6 Measure level at A2TP5 The level at 2 5 should change from 41 to 5V for a 4 MHz oscillator variation After repairs have been made connect 91 wire to A7C2 and perform adjustment procedures listed in paragraph 5 9 Figure 8 9 Mixer Diode Forming Dimensions in Inches HP 84444 Tracking Generator max Model 8444 8444 Figure 8 10 Modulator Oscillator Driver Assy 2 Component Locations Figure 8 11 Amplifier and Pin Diode Modulator Assy A4A1 Component Locations HP 8444A Tracking Generator max AMPLIFIER MODULATOR 55 4 THIRD LO INPUT 5 gt gt Oto 4dBm w13 10 RB cn 50X 20 V 98 6 3 6 493 uu 1 D o E 245 149 1 15 Ri7 1853 0020 7 5 46 Q5 1000 1853 0020 SN 18 oy 1853 0020 RIB i 2 N ES NJ 5 RF R2 V DIODE 3215 R19 46 11 1000 100 fr N06 do 1854001 0 33 CR3 9 9 R25 R24 215 41 REF DIODE SIGNAL 10v 10v LIMIT e Sony lt w 10V 10V REFERENCE DES 15 AIRI DESH COMPLETE AS SH HP 84444 Tracking Generator max e 02V 20 18 6V Ls 19 3 V F 511 03 02 15 CR2 0020 1853 0020 93 ak Q5 49 3 v 11000 LN 1853 0
92. RRENT MAIN CURRENT COLLECTOR V 46 CONTROIN BASE EMITTER Figure 8 1 Transistor Operation 8 5 HP 8444A Tracking Generator max Service inverting amplifier with gain determined by the resistance of R1 and R2 Circuit is an inverting amplifier with gain determined by R1 and R2 with the input impedance determined by R2 Circuit D contains the functional circuitry and pin connec tion information along with an operational ampli fier review Note In Circuit D it is assumed that the ampli fier has high gain low output impedance and high input impedance FIELD EFFECT TRANSISTORS BLACK EPOXY META PLASTIC METAL CASE Gs OR 560 2 is PASST GDS 62 Gl DIODES DIODE SYMBOL ANODE 91 CATHODE wo 1 STRIPE is 4 N 7 Model 8444 8 30 Operational Amplifier Troubleshooting Pro cedure Measure and record the voltage level at both the inverting terminal pin 2 and the non inverting terminal pin 3 The level should not dif fer by more than 10 mV If the voltage level 15 not within 10 mV check the external circuitry and components the external circuitry input signal operating voltages feedback resistors is nor mal replace the operational amplifier 8 31 ELECTRICAL MAINTENANCE 8 32 Perform the electrical checks and adjust ments once every six months and after
93. S 0180 0228 ELECT 22 UF 10 15VOCW 150D226X901582 DYS AICS 0180 0116 ELECT 6 8 UF 10 35VDCW 1500685 903582 0 5 1 6 0160 3460 CER 0 05 80 20 100VDCW 023 10115037522 00 ALCT 9160 2199 C FXD MICA 30 PF 5 0160 2199 128 0180 0228 ELECT 22 UF 10 15 0 1500226 901582 0 5 1 0180 0116 C FXD ELECT 6 8 UF 10 35 1500685 X90 358 2 0 75 AICRL 1901 0159 DIODE SILICON 0 75 400PIV 581358 4 ALCH2 1901 0159 DIODE SILICON 0 75A 400PIV SR1358 4 1283 1901 0159 0 5 11 0 75 400PIV SR1358 4 1901 0159 DIODE SELICON 0 75 400PTV 581358 4 1 5 1901 0040 0100 5 30MA FDG1088 ALCRO 1901 0200 DIOOE SILICON 100 PIV 1N4998 ALCRT 1901 0200 DIODE SILICON 100 PIV 1N4998 1902 3182 DIODE BREAKDOWN SILICON 12 1V 5 1902 3182 89 1902 3256 SILICON 23 7 5 1902 3256 1884 0012 RECTIFIER SILICON CONTROLLED 2435 28 2N3528 1 811 1902 0761 BREAKDOWN 5 9 5 5 1 821 12 1901 0159 DIODE SILICON 0 75 400PIV 5 1358 4 1 13 1901 0159 DIODE SILICON 0 75 400PIV SR1358 4 14 1901 0159 DIODE SILICON 0 75 400PIV 581358 4 ALCRIS 1901 0159 DIODE SILICON 0 75A 400PIV SR1358 4 1 16 1901 00 0 DIODE SILICON 30MA 061088 1 1 2110 0012 FUSE 0 5 250V 312 500 ALF2 2110 0012 FUSE 0 5 AMP 250V 312 500 ALMPL
94. SSY RF OUTPUTCAUXILIARY CABLE ASSY RF OUTPUT CABLE ASSY THIRD LO INPUT CABLE ASSY RF INTERCONNECT CABLE ASSY RF INTERCONNECT CABLE 55 INTERCONNECT CABLE ASSY INTERCONNEC TING CABLE LINE POWER CONNECTOR PC EDGE 2 X 15 CONTACT EDGE 15 CONTACT CLIP FUSE CLIP FUSE SOCKET TRANSISTOR SOCKET TRANSISTOR WIRING HARNESS TRANSFORMER POWER 115 230 VAC 48 440 HZ HP 8444A Tracking Generator max Replaceable Parts Mfr Part Number 0960 0084 0960 0084 0960 0168 11593A 360132605 0 2 A DQB 4586 36D1326050AA2 98 4586 0160 0155 50 085 0000 313 5005 MOL 1 4 0960 0167 131 150 131 149 5040 0306 08555 20093 08555 20094 080 080 08761 2027 28JR 128 1 1251 2996 2N3055 293011 2N3055 293011 2100 2730 0370 0133 2100 2886 0370 0123 2100 2728 0370 0133 0698 3449 0757 0438 53 55480 121 A1H AlH 08444 20018 08444 20024 08444 20024 08444 20020 08444 60015 08444 60014 08444 20017 08444 20026 08444 20027 08444 20021 08444 20019 08444 20023 08444 60016 08444 60018 08444 60018 08444 60018 08444 60017 8120 1588 251 15 30 261 91 6915 1500 00 125002 125002 133 32 10 013 133 32 10 013 08444 60013 9100 5508 Replaceable Parts Model 8444 Table 6 2 Replaceable Parts Reference Tu Mfr MECHANICAL PARTS 1430 0030 1 STANO TILT 28480 1490 0030 MP2 5000 0050 2 TRIM SIDES 28480 5000 0050 3 5000 0730 2 COVER
95. TS 5 1 5 1 Introduction 5 1 5 4 Equipment Required 5 1 5 6 Factory Selected Components 5 1 5 8 Power Supply Check and Adjustment 5 1 5 9 1 55 GHz Oscillator Power Level Frequency Check amp Adjustment 5 3 5 10 1 55 GHz Oscillator Residual Check 5 6 5 11 First Converter Check Adjustment 5 9 5 12 Automatic Level Control ALC Check and Adjustment 5 11 5 13 Level Control Calibration Check and Adjustment 5 13 VI REPLACEABLE PARTS 6 1 6 1 Introduction 6 1 6 3 Abbreviations 6 1 6 5 Replaceable Parts List 6 1 6 7 Ordering Information 6 1 MANUAL CHANGES 1 1 1 1 Introduction 7 1 7 5 Manual Change 7 1 VIII SERVICE 8 1 8 1 Introduction 8 1 8 3 Principles of Operation 8 1 8 5 Recommended Test 8 1 8 1 Troubleshooting 8 1 8 11 Repair 8 1 8 20 General Service Hints 8 2 8 23 General Service Information 8 4 8 28 Operational Amplifiers 8 5 8 31 Electrical Maintenance 8 6 APPENDICES Required Modification When Replacing A3 A B 1 B Replacement for 08444 60003 A B 1 C Improved Power Supply Stability C 1 D 8444A Tracking Generator Option 058 D 1 D 1 Introduction D 1 D 3 Description D 1 D 6 Manual Changes to Option 058 D 1 D 7 Section 1 D 1 D 9 Section Operation D 2 D 11 Section IV Performance Tests D 3 D 13 Section VI Replaceable Parts D 4 D 14 Section VIII Service D 5 D 15 Description of Option 058 D 5 HP 8444A Tra
96. able Assembly Selectro Female to Selectro Male Test Cable 8 inches long HP 11592 60003 Adapter BNC Jack to BNC Jack UG 914A U HP 1250 0080 P Performance Test A Adjustments T Troubleshooting HP 8444A Tracking Generator max Model 8444 General Information Table 1 3 Test Equipment and Accessories 3 of 3 Item Minimum Specifications Wrench Open end 5 16 inch Suggested Model HP 8720 0030 No 10 Allen Driver HP 5020 0291 Test Lead Test lead with alligator clips Wrench Open end 15 64 inch Low pass Filter 700 MHz Cut off Table 1 4 Operating Accessories Resistor 100K ohm 5 1 watt HP 0757 0367 1 8710 0946 8554 Spectrum Analyzer Section with frequency range of 500 kHz to 1250 MHz HP 8555A RF Section Spectrum Analyzer RF Section with frequency range of 01 to 18 GHz When used with Tracking Generator covers frequency range of 10 to 1300 MHz HP 140T Display Spectrum Analyzer Display Section co Section HP 141T Display Spectrum Analyzer Display Section wi Section Compatible with Tracking Generator HP 8552A IF Section Spectrum Analyzer IF Section compat per division log range HP 8552B IF Section Spectrum Analyzer IF Section compat division log range mpatible with Tracking Generator th storage CRT display capability
97. able W4 fr LO signal at AT FL1 and AT2 3 Check 1st LO associated cable SERVICE SHEET 1 8 12 HP 8444A Tracking Generator max Service Model 8444A ated output Connect Disconnect cable W8 at AT3J2 and measure el at power level of 1 55 GHz oscillator signal ee e ea oscillator cord power Level should be equal to or greater than RSS TOL i 2 2 7 dBm VES dBm Refer to Service Sheet 3 for First Converter 5 Troubleshooting procedure re oscillator fully CCW Refer to paragraph 5 9 for oscillator power tevel and 500 kHz frequency check and adjustment Refer to Service check fora Sheet 3 for oscillator troubleshooting procedure Cable W10 ith cut off Check cable W9 Connect cable W10 to A6J3 Discon f RF i e ME nect cable W4 from AT2J2 Measure power level of 1st Sheet 4 a Second Converter Assy the output LO signal at AT2J2 Typical signal loss through AT1 procedures for aton FL1 and 3 1 dB should be tion ice Sheet 3 Check 1st LO signal level through AT1 FL1 and bleshooting associated cables Replace defective component 2 Perform rset NULL shed er trouble uli E 8 12 Figure 8 7A Troubleshooting Tree HP 8444A Tracking Generator max ISOLATOR ATI 2 3 4 GHz BP FILTER ISOLATOR 1 1 1 B 1055 l2 de LOSS 1 48 1058517 J2
98. alyzer to scan desired frequency range FREQUENCY control adjusted to center of frequency of interest SCAN WIDTH set for desired coverage Insert device to be tested between Tracking Genera tor RF OUTPUT and Spectrum Analyzer INPUT RF Rotate Tracking Generator MANUAL SCAN control fully counterclockwise Set Spectrum Analyzer SCAN MODE switch to EXT INTENSITY FREQUENCY BANDWIDTH Rotate Tracking Generator MANUAL SCAN control clockwise to tune system through selected frequency range TUNING STABILIZER BASE LINE CLIPPER For automatic scanning set SCAN switch to INT and SCAN TIME PER DIVISION to desired scan time Figure 3 3 Tracking Generator Operation with 8554B Spectrum Analyzer 2 of 2 3 5 HP 8444A Tracking Generator max Model 8444 E 8444A TRACKING GENERATOR 5 1300 MHz sacaran N DISPLAY SECTION sacas po SPEED su ACCESSORY OUTLET 115 230 10 48 240 35 VA OER OTHE v A NR rete MENT IKI lt lh sf AA NNLLA ig gt Figure 3 4 Tracking Generator Operation with 8555A Spectrum Analyzer 1 of 2 3 6 HP 84444 Tracking Generator max Model
99. assband with bandwidth at the 60 dB points less than 10 kHz a Spectrum Analyzer 8555A control settings FREQUENCY 20 MHz BANDWIDTH 3 kHz SCAN WIDTH PER DIVISION 5 kHz INPUT ATTENUATION 10dB SCAN TIME PER DIVISION 20 MILLISECONDS LOG REF LEVEL 0 dBm VIDEO FILTER 100 Hz SCAN MODE ceeds REV ss INT SCAN LOG DINBAR lt LOG b Tracking Generator control settings TRACK ADJ LEVEL 2 m2 nuin SR Figure 3 5 20 MHz Crystal Filter CRT Display 3 15 Bandpass Filter Measurement 3 16 Figure 3 6 illustrates the CRT display for a 50 MHz bandpass filter Filter characteristics 50 MHz 4 pole bandpass filter adjusted for band width of approximately 5 MHz at the 3 dB points Bandwidth at 60 dB points is approximately 32 MHz a Spectrum Analyzer 8555A control set tings FREQUENCY 50 MHz BANDWIDTH 10 kHz SCAN WIDTH PER DIVISION 5 MHz INPUT ATTENUATION 10dB 3 8 Model 8444A SCAN TIME PER DIVISION 0 5 SECONDS LOG REF LEVEL 0 dBm VIDEO FILTER 6 eae 10 Hz SCAN SCAN TRIGGER AUTO LOG LINEAR b Tracking Gener
100. ational amplifier and the loop gain is adjusted while maintaining 0 dB output level A limiter in the amplifier circuit is adjusted to prevent a large swing in the driver output when the analyzer sweeps through zero frequency Perform Level Control Calibration paragraph 5 19 after ALC loop adjustment AC VOLTMETER TEST OSCILLATOR POWER METER COR CABLE ASSEMBLY RF MILLI VOLTMETER CABLE ASSEMBLY Figure 5 7 Automatic Level Control ALC Check and Adjustment Test Setup EQUIPMENT Spectrum Analyzer HP 8555A 8552 141T Power Meter a oa a aeee cumbre Ee Y gs HP 432A Thermistor Mounts oi HP 8478B AC Voltmeter R dex ee due up up HP 400E DC Voltmeter RF Millivoltmeter HP 412A Test OsclllAatoE 4 8 REE WERE gh ORAE ahd m MO HP 652A Test Lead with alligator Cable Assembly ou ee ee Ree es HP 10501 2 15521515140 ie ipse d iub dir bre NS 100K ohm 5 1 watt Terminated with alligator clips PROCEDURE 1 Perform Spectrum Analyzer calibration procedure refer to appropriate operation and service manual 2 Connect test setup as indicated in Figure 5 7 and set controls as follows Spectrum Analyzer BAND v iei aite n 1 2 05 GH
101. ations of the 8444A Option 058 when used with the 8554B and 8555A Spectrum Analyzers can be found in Table 1 1 of the 8444A manual Swept Frequency Response Measurements Absolute Amplitude Calibration Range Dynamic Range 90 dB from Spectrum Analyzer 1 dB Spectrum Analyzer gain compression point to average noise level approxi mately 10 dBm to 100 dBm Log From 117 dBm to 30 dBm 10 dB div on a 70 dB display or 1 dB div on an 8 dB display Average Noise Level 107 dBm with 10 kHz Resolution Linear From 2 2 uV 100 dBm to 7 1V 30 bandwidth dBm full scale in 10 dB steps HP 8444A Tracking Generator max Appendix D Model 8444A Table D 1 Continued Frequency Range 500 kHz to 1300 MHz Scan Width Determined by Spectrum Analyzer Con trols Per Division 14 Calibrated Scan Widths from a 5 kHz div to 100 MHz div in a 2 5 10 sequence Scan Analyzer is a fixed tuned receiver Frequency Resolution 3 kHz Stability Residual FM peak to peak 1 kHz for time lt 0 1 Amplitude Accuracy System Frequency Response 1 50 dB 0 5 dB for 8444 058 10 dB for 8558B SWEEP CW GENERATOR Frequency Controlled by Spectrum Analyzer Range 500 kHz to 1300 MHz Scan widths are determined by Spectrum Analyzer controls Frequency Accuracy Same as the 8558B Can be im proved using an external counter Flatness 0 5 dB Spectral Purity Residual FM peak to peak 1 kHz f
102. ator control settings TRACK ADU Peak 0 dBm Figure 3 6 50 MHz Bandpass CRT Display 3 17 Low Pass Filter Measurement 3 18 Figure 3 7 illustrates the CRT display for a 23 MHz low pass filter Filter characteristics 3 dB point at approximately 23 MHz 60 dB point at approximately 42 MHz a Spectrum Analyzer 8555A control settings FREQUENCY acess 25 MHz SCAN WIDTH PER DIVISION 5 MHz BANDWIDTH 100 2 INPUT ATTENUATION 10dB SCAN TIME PER DIVISION 0 1 SECONDS LOG LINEAR LOG LOG REF LEVEL 10 dBm LOG REF LEVEL Vernier 3 dB 5 5225245250 22 10 2 SCAN MODE gt INT SCAN TRIGGER esnan AUTO b Tracking Generator control settings TRACK ADd si ssecesseesaesseeseyss Peak DEVE 25 0 dBm 8444 Tracking Generator max Model 8444 Figure 3 7 23 MHz Low Pass Filter CRT Display 3 19 Swept Return Loss Measurement 3 20 Figure 3 8 illustrates the CRT display for a swept return loss or reflection coefficient measure ment A directional bridge HP 8721A was used to separate the incident from the reflected signal The filter under test is the same 23 MHz Low Pass para graph 3 18 Control setting
103. cal insulation cor rosion prevention properties Specification Item Recommended Ungar No 776 handle with Ungar No 4037 Heating Unit Ungar No PL111 Freon Aceton Lacquer Thinner Isopropyl Alcohol 100 dry Resin flux core high tin con tent 60 40 tin lead 18 gauge SWG preferred Krylon 1302 Humiseal Protective Coating Type 1B12 by Columbia Technical Corporation Woodside 77 New York For working on etched boards for general purpose work use Ungar No 1237 Heating Unit 37 5W tip temperature of 750 800 degrees and Ungar No PL113 1 8 inch chisel tip Krylon Inc Norristown Pennsylvania HP 8444A Tracking Generator max Model 8444 cathode relationship a vacuum tube The base emitter junction is essentially a solid state diode for the transistor to conduct this diode must be forward biased As with simple diodes the for ward bias polarity is determined by the materials forming the junction Transistor symbols on sche matic diagrams reveal the bias polarity required to forward bias the base emitter junction The B part of Figure 8 1 shows transistor symbols with the terminals labeled The other two columns compare the biasing required to cause conduction and cut off in NPN and PNP transistors If the transistor base emitter junction is forward biased the transis tor conducts However if the base emitter junction is reverse biased the transistor is cut o
104. cal oscillator input and output connec tors Refer to Table 1 2 for description and HP part number of cables supplied with the Tracking Generator 2 21 STORAGE AND SHIPMENT 2 22 Original Packaging 2 23 The same containers and materials used in factory packaging can be obtained through the Hewlett Packard Sales and Service offices listed at the rear of this manual 2 24 If the instrument is being returned to Hewlett Packard for servicing attach a tag indicat 8120 1348 8120 1369 Model 8444A ing service required return address instrument model number and full serial number Mark the container FRAGILE to assure careful handling 2 25 In any correspondence refer to the instru ment by model number and full serial number 2 26 Other Packaging Materials 2 27 The following general instructions should be followed when repackaging with commercially available materials a Wrap the instrument in heavy paper or plastic If shipping to a Hewlett Packard Service office or center attach a tag indicating the type of service required return address model number and full serial number b Usea strong shipping container A double wall carton made of 350 pound test material is adequate c Use enough shock absorbing material three to four inch layer around all sides of the instrument to provide firm cushion and prevent movement inside the container Protect the control panel with cardboard d Seal the shipp
105. ch prove to be defective during the warranty period provided they are returned to Hewlett Packard No other warranty is expressed or implied We are not liable for consequential damages Service contracts or customer assistance agreements are available for Hewlett Packard products that require maintenance and repair on site For any assistance contact your nearest Hewlett Packard Sales and Service Office HP 8444A Tracking Generator max PACKARD HEWLETT OPERATING AND SERVICE MANUAL TRACKING GENERATOR 8444A INCLUDES OPTION 058 SERIAL NUMBERS This manual applies directly to instruments with serial numbers prefixed 1828 With modifications described in Section VII this manual also applies to instruments with serial num bers prefixed 1033A 1139 1147A 12084 and 1215A For additional important information about serial numbers see INSTRUMENTS COVERED BY MANUAL in Section I Copyright HEWLETT PACKARD COMPANY 1972 3273 AIRWAY DRIVE SANTA ROSA CALIFORNIA U S A Manual Part No 08444 90012 Microfiche Part No 08444 90013 Printed JANUARY 1975 HP 8444A Tracking Generator max Model 8444A TABLE OF CONTENTS Section I II IH IV GENERAL INFORMATION 1 1 Introduction 1 5 Safety Considerations 1 16 Instruments Covered by Manual 1 18 Description j 1 21 8554B RF Section Modifications 1 23 Accessories Supplied 1 25 Operating Accessories 1 27 Warranty
106. cked by tuning the Spectrum Analyzer and Tracking Generator to a known frequency and measuring the Tracking Generator output with an external counter The slide rule dial can be visually checked for an accuracy of 15 MHz Pauw Re ree LOUTRUT j BNC CABLE _ FREQUENCY COUNTER e 5755497 11 21 UT 9 5 13 2 BNC CABLE Figure 4 5 Frequency Accuracy Test Setup EQUIPMENT Spectrum Analyzer 8554B 8555A 8552A 141T Frequency Counter HP 5245L Frequency Converter 2 2 HP 5254C West scillator is ile do ee XR Ee hei aer dd HP 652A Signal Generator 606A B VHF Signal Generator 608E F Signal Generator lle HP 612A Cable Assembly ox se RU per E RO motard HP 10503A PROCEDURE 1 Perform preset adjustment procedures paragraph 4 7 for 8554B 8552B 141T Spectrum Analyzer System or paragraph 4 9 for 8555A 8552B 141T Spectrum Analyzer System 2 Connect test setup as indicated in Figure 4 5 and make the following control settings Spectrum Analyzer See paragraph 4 7 or 4 9 Frequency Counter SAMTLE RATE EG seinem Boe NAE A eo 12 o clock SENSEBDVLDY 2 2 ous Mer tute atc AR TENTER 1 VOLTS RMS TIME Se
107. cking Generator max iii Contents Model 8444A LIST OF ILLUSTRATIONS Figure 1 1 Model 8444A Tracking Generator and Accessories 2 1 2 Instrument identification 5 2 1 Power Cable Line Connector Labels 3 1 Model 8444A Tracking Generator Front Panel Controls Indicators and Connectors 3 2 Model 8444 Tracking Generator Rear Panel Controls and Connectors 3 3 Tracking Generator Operation with 8554B Spectrum Analyzer 1 3 4 Tracking Generator Operation with 8555 Spectrum Analyzer 3 5 20 MHz Crystal Filter CRT Display 36 50 MHz Bandpass Filter CRT Display 37 23 MHz Low Pass Gilter CRT Display 3 8 Swept Return Loss Measurement CRT Display 39 Amplifier Gain and Bandwidth CRT Display 3 10 Precision Frequency Measurement CRT Display 4 1 Output Level Accuracy Test Setup 4 2 Residual Test Setup 4 3 Demodulation Sensitivity Measurement 4 4 Amplitude Accuracy Test Setup 4 5 Frequency Accuracy Test Setup 4 6 Harmonic Distortion Test Setup 4 1 Typical Harmonic Distortion CRT Display 0 to 100 MHz 4 8 Typical Harmonic Distortion CRT Display 0 to 500 MHz 5 1 Adjustment Test Setup 5 2 1 55 GHz LO Power Level and Frequency Check and Adjustment Test Setup 5 3 1 55 GHz LO Residual FM Check Test Setup 5 4 Demodulation Sensitivity Measurement 5 5 First Converter Check and Test Setup 4 5 5 6 First Conve
108. con trol of 8558B 0 Scan Analyzer is fixed tuned receiver Counter reads center frequency to accuracy of tracking drift Counter Output Level Nominally 0 1 Vrms NOTE All above changes in specifications apply to use with an 8558B only D 10 Add the following 8444A Option 058 Tracking Generator Operation information when using the 8558B Spectrum Analyzer 1 Check that the 115 230V switch is set to correspond with the available line voltage Refer to Figure 3 2 steps 4 through 8 for switch and fuse information e Apply power to Tracking Generator and Spectrum Analyzer Tum Spectrum Analyzer INTENSITY control fully CCW Allow instruments to warm up for at least 30 minutes Perform Spectrum Analyzer Operation Check Refer to 8558B Spectrum Analyzer Operating Manual D 2 HP 8444A Tracking Generator max Model 8444 Appendix D 10 11 12 13 14 15 16 D11 D12 Set Spectrum Analyzer LOG LINEAR control to LOG and BANDWIDTH to 300 kHz Set OPTIMUM INPUT dBm to 0 and REF LEVEL dBm to 0 dBm Make the following interconnections between tracking Generator and Spectrum Analyzer a 8558B FIRST LO OUTPUT to 8444A FIRST LO INPUT b 85588 RF OUTPUT to the 8444A RF INPUT c Jumper 500 MHz OUTPUT to THIRD LO INPUT Rear Panel 8444A 058 Check that the Spectrum Analyzer controls are set as follows INTENSITY 120 clock approx FREQUENCY MHz
109. cover Unsolder and remove power wires from A7C2 and Adjust Power Supply for 10 and 10 volts Connect 10 volts to A7C3 and 10 volts to A7C2 Connect Power Supply ground to solder lug near A7 Oscillator Assembly M M ne 1 3 8444 Tracking Generator max Model 84444 Manual Changes 5 9 1 55 GHz Oscillator Power Level Frequency Check and Adjustment cont d 25 26 21 28 29 80 81 32 33 Adjust Power Supply negative voltage for maximum oscillator power level as indicated on Power Meter Record power level gt 7 dBm If power level is less than 7 dBm replace Oscillator Assembly A7 If power level is greater than 7 dBm reduce negative voltage from Power Supply to 10 volts If output level drops 2 dB go to step 30 b output level drops less than 2 dB go to step 28 c output level drops more than 2 dB go to step 29 Increase Power Supply positive voltage approximately 0 5 volts and repeat steps 25 through 21 Decrease Power Supply positive voltage approximately 0 5 volts and repeat steps 25 through 21 Record positive voltage obtained in steps 24 28 or 29 on label top of oscillator assembly Repeat steps 14 through 22 Disconnect Power Meter and connect W8 Cable to Isolator AT3 J2 Replace nght side panel cover Pages 6 3 through 6 5 Table 6 2 change to read as follows A2R29 0698 046
110. d LO input for a power level of at least 0 dBm Record power level dBm NO Troubleshoot power supply circuitry Service Sheet 5 Check first LO cable Refer to Spectrum Analyzer RF Section Manual for troubleshooting procedure for first LO circuits Check third LO cable Refer to Spectrum Analyzer RF Section Manual for troubleshooting procedure for third LO circuits YES B z Reconnect third LO cable Disconnect cable W6 at A4J2 Connect a jumper between test points A2TP1 and A2TP2 Connect Selectro Female to BNC cable to A4J2 and measure power for a level of 3 to 15 dBm Record power level dBm Remove Modulator Oscillator Driver Assy A2 Power level at A4J2 15 dBm Connect 1000 ohm resistor between A4C3 and chassis ground Power level at A442 3 dBm HP 8444 Tracking Generator max Service Adjust A2R17 NULL ADJ for an indicated output Treubl shoot lv circuitrv Servite Sheet 5 of 8 dBm Disconnect cable W9 at A5J3 Connect POWE APR Service cable W6 to A4J2 and measure power level at A5J3 Power level should be 11 dBm 1 dB Record power level YES Disconnect cable W8 at AT3J2 and measure oscillator frequency Rotate TRACK ADJ control fully CCW and check for a frequency of 1 548 MHz 500 kHz Rotate TRACK ADJ control fully CW and check for frequency of 1 552 MHz 500 kHz Dm YES Connect Cable W8 to AT3J2
111. d and or in the data test card at the end of this section Comparison of initial data with data taken during periodic adjust ments assists in preventive maintenance troubleshooting Note Control settings are called out for a HP 8555A Spectrum Analyzer RF Section If the RF Section used is a HP 8554B disregard BAND and SIGNAL IDENTIFIER control settings Otherwise the Spectrum Analzyer control settings apply to either instrument 5 4 EQUIPMENT REQUIRED 5 5 Each check and adjustment procedure con tains a list of test equipment required for that particular test Table 1 3 contains a tabular list of test equipment and accessories required In addi tion the table contains the required minimum specifications and a suggested manufacturers model number 5 6 FACTORY SELECTED COMPONENTS 5 7 Factory selected components are designated by an asterisk on the schematic diagrams in Section VIII of this manual Table 8 1 contains a list of factory selected components by reference designation basis of selection and schematic dia gram location on which the component is illus trated 5 1 HP 8444A Tracking Generator max Adjustments Model 8444A ADJUSTMENTS 5 8 Power Supply Check and Adjustment REFERENCE Service Sheet 5 DESCRIPTION Power supplies in the Tracking Generator provide regulated output of 20 and 10 volts The 20 volt supply is adjustable and provides the reference for the 10 volt suppl
112. d effect transistor flip flop flat head fillister head frequency modulation front panel frequency fixed gram germanium gigahertz glass ground ed heterodyne hexagonal head hard ware high frequency mercury high Hewlett Packard high pass filter hour used in parts list high voltage Hertz integrated circuit inside diameter intermediate frequency impregnated inch incandescent include s input insulation abbreviations in the parts list will be in upper case HP 84444 Tracking Generator max Model 8444A integrated circuit microcircuit electron tube voltage regulator breakdown diode cable transmission path wire crystal unit piezo electric or quartz tuned cavity tuned circuit internal kilogram kilohertz kilohm kilovolt pound inductance capacitance light emitting diode low frequency long left hand linear taper used in parts list linear LK WASH lock washer LO low local oscillator LOG logrithmic taper used in parts list logrithm ic low pass filter low voltage meter distance milliampere maximum megohm meg 109 used in parts 1151 MET FLM metal film MET OX metallic oxide medium frequency microfarad used in parts list manufacturer milligram megahertz minute t me minute plane miniature millimeter Model 8444 Manual Changes SECTION VII MANUAL CHANGES 7 1 INTRODUCTION
113. d make the following control settings Power Meter tu he eins Aid eate 2 0 dBm ecg noe RE hes Send che ea ea aD ON MOUNT RESISTANCE 2000 CALIBRATION FACTOR See mount Spectrum Analyzer See paragraph 4 7 or 4 9 Frequency Counter SAMPLER ATE 2 4 Om Go eee Tee Ee 12 o clock SENSLEDIVEDY Lol hv o e ST ee le a od 1 VOLTS RMS TIMBE BASE odes dee rt vie eke pus As tee ee ait 10 ms EUNCIDTIQN eater det Be ene te Be FREQUENCY Tracking Generator See paragraphs 4 7 or 4 9 Set Spectrum Analyzer SCAN WIDTH to ZERO and adjust frequency FINE TUNE for indication of 30 MHz 100 kHz on Frequency Counter Tune Tracking Generator TRACK ADJ of maximum signal amplitude on Spectrum Analyzer Set LEVEL control to 0 dBm Disconnect cable at Tracking Generator RF OUTPUT Connect Thermistor Mount to Tracking Generator RF OUTPUT Measure and record power level 0 0 5dBm_ Rotate Tracking Generator LEVEL control fully counterclockwise Measure and record power level ___ 10 to 12 dBm Set LEVEL control to 0 dBm and record power level dBm Set Spectrum Analyzer TUNING STABILIZER to OFF and adjust FREQUENCY control for an indication of 10 MHz 100 kHz on Frequency Counter Measure and record Tracki
114. dio frequency automatic frequency control automatic gain control aluminum automatic level control amplitude modula amplifier automatic phase control assembly average American wire balance binary coded decimal copper beat frequency oscillator binder head breakdown bandpass bandpass filter brass backward wave oscillator calibrate counter clock wise ceramic centimeter cabinet mount only REFERENCE DESIGNATIONS miscellaneous electrical part circulator electrical connector stationary portion relay coil inductor miscellaneous mechanical part electrical connector movable portion plug transistor SCR triode thyristor resistor thermistor switch transformer terminal board thermocouple test point ABBREVIATIONS coefficient composition complete connector cadmium plate cathode ray tube complementary transistor logic continuous wave clockwise centimeter digital to analog decibel decibel referred to 1 mW direct current degree temperature interval or differ degree plane degree Celsius centigrade degree Fahrenheit degree Kelvin deposited carbon detector diameter diameter used in Parts list DIFF AMPL differential amplifier double pole double throw double sideband diode transistor logic digital voltmeter emitter coupled logic electromotive force NOTE electronic data processing electrolytic encapsulated external farad fiel
115. e 5 5 set controls as follows Tracking Generator GINES TR th EM ON I BRACGIS ADI Se eed tee Open edhe nes 2 Centered LEVEL a Bes Ml eee ee eee te de ee evi a 0 dBm Spectrum Analyzer BAND n 1 2 05 GHz IF FREQUENCY ee ens th een nt dE ote 500 MHz BANDWIDTH m Series Gi Bits Mode BG ge RA an de oe oh 100 kHz SCAN WIDTH PER DIVISION 5 MHz INPUT ATTENUATION LSS Oe 20 dB SCAN TIME PER DIVISION 20 MILLISECONDS LOG REFR GEN Bis ORB ee See 10 dBm EnD stole oe PEO a eg 10 dB LOG HP 8444A Tracking Generator max 5 9 Adjustments Model 8444 ADJUSTMENTS VIDEO FILTER Cw Te le Unc ae 10 kHz SCAN 5222055 5 ale ce a Bee Soe el weis di INT SCAN TRIGGER 3 Disconnect W6 cable at RF OUT of 500 MHz Amplifier Assembly A4 4 Connect 11592 60001 cable between A4 RF OUT and Spectrum Analyzer INPUT using UG 201A U adapter 5 Record 500 MHz signal level 0 dBm 6 Disconnect 11592 60001 cable from A4 RF OUT connector 7 Install W6 cable removed in step 3 above
116. e driver and current limiter function in the same manner as the driver and limiter in the positive supply TROUBLESHOOTING PROCEDURE CAUTION Before troubleshooting the power supplies disconnect the 20 volt red 2 wire from the Amplifier and ALC Detector Assembly A3 When a malfunction has been isolated to the power supply or line input circuits or to isolate a malfunction in the circuits perform the following procedure A2 1 FL 1 Second Converter Circuits Schematic Diagram SERVICE SHEET 4 HP 8444A Tracking Generator max 8 18 8 18 SERVICE SHEET 5 EQUIPMENT REQUIRED Volt Ohm Ammeter HP 412A Digital Voltmeter HP 3440A 3443A input circuit Check the input circuits against the wiring diagram and schematic diagram 20 VOLT SUPPLY LINE ON OFF switch to OFF Remove top cover and disconnect 20 volt red wire from microcircuit A3 Check fuses A1F1 and F2 If fuse A1F1 is blown check power transistor Q1 for a short If fuse 1 2 is blown check power transistor Q2 for a short After replacing fuse apply power and check voltage at 1 1 for 20 volts If the voltage level is between 10 and 15 Vdc troubleshoot operational amplifier 101 graph 8 30 and associated circuitry If the voltage output is less than 1 volt remove silicon controlled rectifier A1CR10 If the outpu
117. ed repeat steps 15 through 18 Disconnect Power Meter and connect W8 Cable to Isolator J2 Replace right side panel cover 5 5 8444A Tracking Generator max Adjustments Model 8444A ADJUSTMENTS 5 10 1 55 GHz Oscillator Residual FM Check REFERENCE Service Sheet 3 DESCRIPTION The 1 55 GHz oscillator is checked for residual FM by mixing the oscillator output with a stable signal source and observing the resultant output on a calibrated spectrum analyzer display The second converter in Tracking Generator is used to mix the oscillator output with the 1500 MHz comb signal from a Frequency Comb Generator The mixer output is displayed using a HP 141T 8553B 8552B Spectrum Analyzer System which has less than 20 Hz peak to peak residual FM There are no adjustments for oscillator residual FM Perform power supply check for excessive ripple if residual FM is excessive CABLE ASSEMBLY FREQUENCY COMB GENERATOR UG 201A U CABLE ASSEMBLY Figure 5 3 1 55 GHz LO Residual FM Check Test Setup EQUIPMENT Spectrum Analyzer System HP 141T 8553B 8552B Frequency Comb Generator HP 8406A Cable Assy Selectro male to Selectro female HP 11592 60003 Cable Assy Selectro female to male 2 each HP 11592 60001 Adapter to UG 201A U PROCEDURE 1 Perform Power Supply Check and Adjustment paragraph 5 8 2 Perform 1 55 GHz
118. eiex 0885 514 Cable BLUESTAR Blue Star Ltd 1 1 11711 Devi Road Secunderabad 500 003 Tel 70126 70127 Telex 015 459 Cable BLUEFROST Blue Star Ltd 2 34 Kodambakkam High Road Madras 600 034 82056 Telex 041 379 Cabie BLUESTAR INDONESIA BERCA indonesia 496 Jkt Jin Abdul Muis 62 Jakarta Tel 40369 49886 49255 356038 Telex Jkt 42895 BEACA Indonesia P O Box 174 5 23 Jin Jimeno Suraba Tel 42027 Cable BErcacon ISRAEL Electronics Engineering Div 01 Motorola Israel Ltd 16 Kremenetski Street 0 25016 Tel Aviv Tel 38973 Telex 33569 Cable BASTEL Tel Aviv JAPAN Yokogawa Hewlett Packard Ltd Chuo Bldg 4th Floor 4 20 Nishinakayma 5 chome Yodogawa ku Osaka shi Osaka 532 06 304 6021 Telex 523 3624 Yokogawa Hewiett Packard Ltd 29 21 Takaido Higashi 3 chome Suginami ku Tokyo 168 Tel 03 331 6111 Telex 232 2024 YHP Tokyo Cable YHPMARKET TOK 23 724 Yokogawa Hewlett Packard Ltd Nakamo Building 24 Sasajma cho Nakamura ku Nagoya 450 Tet 052 571 5171 Yokogawa Hewlett Packard Ltd Tanigawa Building 2 24 1 Tsuruya cho Kanagawa ku Yokohama 221 Tel 045 312 1252 Telex 382 3204 YHP YOK Yokogawa Hewlett Packard Ltd Mito Mitsui Building 105 1 chome San no maru Mito Ibaragi 310 Tel 0292 25 7470 Yokogawa Hewlett Packard Ltd Inoue Building 1348 3 Asahi cho 1 ch
119. erform the electrical check see paragraph 2 4 The packaging material should be retained for possible future use 2 4 Electrical Check 2 5 The electrical check consists of following the performance test procedures listed in Section IV These procedures allow the operator to determine that the instrument is or is not operating within the specifications listed in Table 1 1 The initial performance and accuracy of the instrument are certified as stated on the inside front cover of this manual If the instrument does not operate as specified refer to paragraph 2 6 for the recom mended claim procedure 2 6 CLAIMS FOR DAMAGE 2 7 If physical damage is found when the instru ment is unpacked notify the carrier and the nearest Hewlett Packard Sales and Service office immediately The Sales and Service office will arrange for repair or replacement without waiting for a claim to be settled with the carrier 2 8 The warranty statement for the instrument is on the inside front cover of this manual Contact the nearest Sales and Service office for information about warranty claims 2 9 PREPARATION FOR USE CAUTION Before applying power check the power selector switch on the Tracking Generator input power module rear panel for proper position 115 or 230 volts 2 10 Power Requirements 2 11 The Tracking Generator can be operated from a 48 to 440 hertz input line that supplies either 115 or 230 volt 10 in each case
120. erter output is applied through the 0 to 1 3 GHz low pass filter amplifier and ALC circuitry The resultant output is a signal in the frequency range of 0 to 1 3 GHz at a level of 0 to 10 dBm Sweep and tune control of the Spectrum Analyzer from the Tracking Generator is provided by a 0 to 10 volt signal controlled by a front panel MANUAL SCAN control HP 8444 Tracking Generator max Model 8444 2 0 1 3 GHz Oto 10 dBm 8444A TRACKING GENERATOR ISOLATOR 20 3 2 05 3 3 0 FILTE 85548 SPECTRUM ANALYZER SYSTEM RF INPUT W15 w14 SCAN IN OUT 500 MHz gt gt 500 MHz dBm 8555A SPECTRUM ANALYZER SYSTEM 2 05 4 EXT MIXER FIRSTLO 1 6 OUTPUT dBm 15 G C SECOND LO Cy 0 1 3 GHz 0 0 to 10 dBm INPUT SCAN IN OUT HP 84444 Tracking Generator max DEVICE UNDER TEST ING GENERATOR n 0 1 3 GHz 322572 59 E SOLATOR 2 0 3 4 GHz ISOLATOR SECOND ay eee Ss BANDPASS AT2 CONVERTER FILTER O 12648 ALC A 52 DETECTOR v RF OUTPUT LI V x E 1 55 GHz 2 MHz I SOLATOR OSCILLATOR AT3 gt ACK ADJ 6 DEVICE UNDER ANUAL 20V TEST 500 MHz ALC PIN MODULATOR ALC FIRST COMPARATOR CONVERTER DC AMPL REF DIODE SIGNAL RF
121. et and wht blk violet wires to A7C3 2 Component changes Add R5 5 11K 0757 0438 between con nector pins 2 10 and unused XA2 12 then short pins XA2 12 and XA2 11 10V together b Replace A2R29 with 100K 0757 0465 c Replace A2R36 with 6 81K 0757 0439 CALIBRATION To calibrate the new assembly follow the 1 55 GHz Oscillator Power Level Frequency Check and Adjustment procedure pages 5 3 to 5 5 1 2 8444 Tracking Generator max Model 8444 APPENDIX SERVICE NOTE 8444 1 HP MODEL 8444 TRACKING GENERATOR Serials Prefixed 1147A and Below IMPROVED POWER SUPPLY STABILITY The 20V power supply stability can be improved by changing A4A1C2 from 24 pF to 1000 pF HP Part No 0160 3456 The new value eliminates any oscillation tendencies and is a recommended modification for all instruments with serials listed above C 1 2 HP 8444A Tracking Generator max Model 8444 Appendix D APPENDIX D MODEL 8444A TRACKING GENERATOR OPTION 058 D1 INTRODUCTION D2 This appendix explains the use of an 8444A Tracking Generator with an 8558B 180 Spectrum Analyzer system when Option 058 circuitry is added to the 8444A The Tracking Generator is designed to generate a CW tracking signal for an 8555A 8552 140 Spectrum Analyzer system when operating in the range of 0 5 to 1300 MHz With Option 058 circuits added a 0 5 to 1300 MHz CW tracking signal can also be generated by an 8
122. ff open The voltage drop across a forward biased emitter base junction varies with transistor collector cur rent For example a germanium transistor has a typical forward bias base emitter voltage of 0 2 0 3 volt when collector current is 1 10 mA and 0 4 0 5 volt when collector current is 10 100 mA In contrast forward bias voltage for silicon transistor is about twice that for germanium types about 0 5 0 6 volt when collector current is low and about 0 8 0 9 volt when collector current is high 8 26 Figure 8 1 Part A shows simplified versions of the three basic transistor circuits and gives the characteristics of each When examining a transis tor stage first determine if the emitter base junc tion is biased for conduction forward biased by measuring the voltage difference between emitter and base When using an electronic voltmeter do A Amplifier Characteristics Service not measure directly between emitter and base there may be sufficient loop current between the voltmeter leads to damage the transistor Instead measure each voltage separately with respect to a common point e g chassis If the emitter base junction is forward biased check for amplifier action by short circuiting base to emitter while observing collector voltage The short circuit elim inates base emitter bias and should cause the tran sistor to stop conducting cut off Collector volt age should then change and approach the su
123. fier ALC detector and level control circuits FIRST LO INPUT CIRCUIT The first LO input circuit consists of Isolators AT1 AT2 and Filter FL1 Isolators AT1 and AT2 allow the first LO input signal to be applied to the second converter while preventing the flow of signals from second converter back to the input Filter FL1 is a bandpass filter over the 2 to 3 4 GHz frequency range Signals outside the bandpass frequency range attenuated SECOND CONVERTER ASSY A6 The second converter consists of stripline circuitry and a pair of hot carrier diodes The second converter mixes the 2 to 3 4 GHz LO signal with the 2 05 GHz first converter output signal to produce a 0 to 1 35 GHz signal that tracks the tuning of the LO input signal Conversion loss in the second converter is typically 7 dB The converter assembly is a sealed unit and should be repaired by replacing the entire A6 Assembly AMPLIFIER AND ALC DETECTOR ASSEMBLY A3 The amplifier and detector assembly contains large scale integrated LSI circuits consisting of 3 dB attenuator a 1 3 GHz low pass filter a wideband amplifier a level detector circuit a 1 4 GHz low pass filter and a dc blocking capacitor The 0 to 1 35 GHz signal from the second converter is applied through a 3 dB attenuator for impedance matching and a 1 3 GHz low pass filter to wideband amplifier The amplifier provides approximately 26 dB gain over the frequency range of 500 kHz to 1 3 GHz The
124. ge Accuracy 3 of full scale HP 410C Multifunction Voltage Range 300V full scale Voltmeter Input Impedance 10 megohms Frequency Counter Frequency Range 500 kHz 50 MHz HP 5245L Frequency 200 MHz 3 0 GHz Counter with HP 5254C Frequency Accuracy 0 0190 Frequency Converter Test Oscillator Frequency Range 10 Hz 10 MHz HP 652A Test Oscillator Frequency Accuracy 3 Output Amplitude 3 Vrms Output Impedance 50 ohms HF Signal Generator Frequency Range 1 50 MHz HP 606A B HF Signal Output Amplitude gt 0 dBm Generator Frequency Accuracy 190 Output Impedance 50 ohms Signal Generator Frequency Range 50 450 MHz HP 608E F VHF Signal Output Amplitude gt 0 dBm Generator Output Impedance 50 ohms UHF Signal Generator Frequency Range 450 1200 MHz Output Amplitude 0 dBm Output Impedance 50 ohms HP 612A UHF Signal Generator Digital Voltmeter Voltage Accuracy 0 2 HP 3440A Digital Volt Voltage Range 1 30 Vde meter w HP 3443A Polarity Automatic Indication Plug in P Performance Test A Adjustments T Troubleshooting 1 5 HP 8444A Tracking Generator max General Information Item Model 8444 Table 1 3 Test Equipment and Accessories 2 of 3 Minimum Specifications Suggested Model Use Variable Voltage Transformer Power Supply Dual De Voltage Range 102 1
125. gure 8 19 7 1 55 GHz Oscillator Assembly Illustrated Parts Breakdown 1 of 2 HP 8444A Tracking Generator max DIODE VOLTAGE VAR 6 8 pF 0122 0245 A7C2 C3 C FXD 1000 pF 500 VDCW 0160 0345 A7C1 C FXD 1 0 pF 0 1 0160 3827 1 R 562 OHM 0698 7280 ATR2 R FXD 619 OHM 0757 0418 CONNECTOR RF 1250 0829 SPRING COMPRESSION 1460 0103 791 TRANSISTOR SI NPN 1854 0292 WASHER LOCK 0 211 DIA 2190 0057 WASHER LOCK 0 191 DIA 2190 0124 SCREW SOCKET CAP 8 32 X 0 625 3030 0047 SCREW 10 32 1 000 LG 3030 0397 DELETED PC BOARD OSCILLATOR BLANK 08444 20003 INSULATOR 08444 20006 COVER OSC HOUSING BOTTOM 08444 20008 HOUSING OSCILLATOR 08444 20010 DIELECTRIC CAPACITOR 08444 20013 INNER ELEMENT CAPACITOR 08444 20015 COVER OSCILLATOR HOUSING TOP 08444 20028 INPUT OUTPUT LOOP 08555 00033 CAPACITOR OUTER ELEMENT 08555 20040 WASHER LOCK NO 4 2190 0003 SCREW MACHINE 4 40 X 0 438 LG 2200 0109 SCREW MACHINE 4 40 X 0 250 LG 2200 0139 SCREW MACHINE 4 40 X 0 375 LG 2200 016 SCREW PAN HD 0 80 X 0 125 LG 0516 0003 NUT HEX 60 32 2420 0003 10 32 2740 0002 oO 0o 0 HR H HR mH HI 20 9 NYDN C bo HG HON ON FRE BP ee bo Figure 8 19 A7 1 55 GHz Oscillator Assembly Illustrated Parts Breakdown 2 of 2 HP 8444A Tracking Generat
126. he adapter to ground 2 15 Power cables are selected for shipment with each instrument with a line connector plug to match the standard power cord for the country of destination on the purchase order A label indicat ing the power cable inside is affixed to the packing case Figure 2 1 indicates the connector plugs and the HP part numbers for the various available power cables and plugs 2 16 OPERATING ENVIRONMENT 2 17 The Tracking Generator does not require forced air cooling when operating at temperatures from 0 to 55 C 32 to 131 F When operating the instrument choose a location which wil provide at 2 1 HP 8444A Tracking Generator max Installation least three inches of clearance around the rear and both sides Normal air circulation will maintain a reasonable temperature within the instrument 2 18 INSTALLATION CONNECTIONS 2 19 A rack mounting kit is supplied for rack installation Additionally a joining bracket kit accessory can be provided to secure the Tracking Generator to the Spectrum Analyzer Installation instructions are supplied with both joining bracket and rack mounting kits 2 20 Electrical connections are provided by three coaxial cables and two line power cords Coaxial cables connect Spectrum Analyzer FIRST LO OUTPUT to Tracking Generator FIRST LO IN PUT THIRD LO OUTPUT to THIRD LO INPUT and SCAN OUTPUT to SCAN IN OUT Double shielded coaxial cables are provided for connection between lo
127. ical values shown on schematic Replace defective component and perform ALC NULL adjustment paragraph 5 12 and LEVEL adjustment paragraph 5 13 HP 84444 Tracking Generator max SERVICE SHEET 3 cont d E MODULATOR DRIVER CIRCUIT Check Amplifier and ALC Detector Assembly Service Sheet 4 prior to checking the modulator driver circuit Connect a shorting strap between test points A2TP1 and A2TP2 Connect a shorting strap between A2TP1 and chassis ground Apply power to Tracking Generator Measure and record voltage level at 4 2 PIN diode drive signal Vdc Rotate NU LL ADJ A2R17 throughout its tuning range Note and record level to PIN diode modulators to Vdc Compare with typical range of 14 to 19 7 Vdc If the output is not within the typical limits connect digital voltmeter to junction of A2R15 and R16 Adjust A2R17 for an indicated voltage of 19 3 at the emitter of 295 Troubleshoot the output amplifier using typical voltage levels given for the emitter base and collector of A2Q5 through Q7 on the schematic diagram Troubleshoot the differential amplifier A1Q1 through A2Q3 and limiter A2Q4 using the typical voltage levels given on the schematic diagram When malfunction has been corrected perform adjustment procedures in paragraphs 5 12 and 5 13 See Figure 8 9 for diode forming instructions FIRST CONVERTER ASSEMBLY A5 When a malfunction has been isolated to the first converter remove
128. ide an oscillator output of at least 7 dBm and a frequency tuning range of 4 MHz The ground return lines for the power supply 20 and 10 sense lines are connected to chassis ground adjacent to the 1 55 GHz oscillator This provides a common reference point for the oscillator and sense grounds HP 8444A Tracking Generator max SERVICE SHEET 3 155 GHz OSCILLATOR DRIVER The oscillator driver consists of operational amplifier A2U1 transistor A2Q8 and their associated components Together 171 and 08 function as a non inverting operational amplifier Driver amplifier gain 1 A2R31 over A2R29 in parallel with A2R30 or approximately 2 4 The minimum output voltage is determined by A2R27 TUNE while the maximum output is controlled by A2R26 MAX TUNE and front panel TRACK ADJ potentiometer Adjustments in the oscillator driver correct for minor vari ations in the sensitivity of the oscillator from unit to unit These adjust ments set the upper and lower tuning range limits for the front panel TRACK ADJ potentiometer Potentiometer A2R26 is adjusted to provide a 4 MHz frequency tuning of the oscillator from the front panel TRACK ADJ con trol Refer to paragraph 5 9 for adjustment procedure TROUBLESHOOTING PROCEDURE When a malfunction has been isolated to the 500 MHz amplifier PIN diode modulator and driver circuits or to the 1 55 GHz oscillator and converter circuits perform the appropriate checks belo
129. inate cable at Ac Voltmeter with 50 ohm load RF Section FIRST LO OUTPUT termination Adjust Tracking Generator LEVEL and Ac Voltmeter RANGE switch for a scale indication equal to the Power Meter output level measurement in step 32 above Voltmeter indication approximately 10 dB low Adjust Tracking Generator MANUAL scan to tune Spectrum Analyzer over the frequency range of 500 kHz to 10 MHz Measure and record maximum deviation from reference level established in step 34 dB Add deviation levels in step 36 to level in step 32 for maximum deviation from 0 dBm level over frequency range of 500 kHz to 10 MHz dB If deviation exceeds 1dB over the frequency range of 500 kHz to 1250 MHz refer to paragraph 5 12 for check and adjustment procedure 4 17 Frequency Stability SPECIFICATION Stablity Residual FM peak to peak Tuning Section Stabilized Unstablized 8554B 8555A 200 Hz 10 kHz DESCRIPTION The stability of the Spectrum Analyzer Tracking Generator System is checked using a HP 141T 8553B 8552B Spectrum Analyzer System which has less than 20 Hz peak to peak residual FM The Spectrum Analyzer in the system must be within residual FM specification limits Refer to appropriate RF Section Operating and Service Manual There are no adjustments in the Tracking Generator for residual FM Refer to paragraph 5 10 if residual FM is excessive HP 8444 Tracking Generator max Model 8444A Performance Tests PERFORMANCE TESTS
130. ing container securely e Mark the shipping container FRAGILE to assure careful handling 8120 1689 Figure 2 1 Power Cable Line Connector Labels 2 2 HP 84444 Tracking Generator max 8444 Operation SECTION III OPERATION 3 1 INTRODUCTION 3 2 This section provides complete operation instructions for the HP Model 8444 Tracking Generator Front and rear panel controls connec tors and indicators for the Tracking Generator are identified and described in Figures 3 1 and 3 2 Operational connections and adjustments for the Tracking Generator and an 8554B Spectrum Ana lyzer System are detailed in Figure 3 3 Operational connections and adjustments for the Tracking Generator and an 8555A Spectrum Analyzer Sys tem are detailed in Figure 3 4 Additional operating information is contained in Figures 3 5 through 3 10 3 3 PANEL FEATURES 3 4 Front and rear panel features of the Tracking Generator are described in Figures 3 1 and 3 2 Front and rear panel views of the Tracking Gener ator connected to the HP 8554B 8552 141T Spectrum Analyzer are shown in Figure 3 3 Front and rear panel views of the Tracking Generator connected to the HP 8555A 8552 141T Spectrum Analyzer are shown in Figure 3 4 For a detailed description of the Spectrum Analyzer controls connectors and indicators refer to the appropriate operating and service manuals for those instru ments Interconnection wiring between the Track ing Ge
131. iode and the reference diode signal from the ALC circuitry in the microcircuit amplifier is amplified by 201 The output of 201 is amplified by the output amplifier A2Q5 through Q7 to control the current to the PIN diode modulators FIRST CONVERTER A5 The first converter mixes the signal from the 500 MHz Amplifier PIN Diode Modulator with the signal from the 1 55 GHz Oscillator The converter con sists of a 500 MHz bandpass filter diode mixer and three radial cavities One cavity functions as a bandpass filter for the 1 55 GHz oscillator signal The other cavities function as an IF filter and provide a two pole Butterworth response Both the IF and LO input cavities are adjustable by tuning slugs The mixer is a single Schottky diode located between the 1 55 GHz oscillator cavity and the 2 05 GHz first IF cavity Mixer bias is provided by resistor A5A1R1 Mixer conversion loss is approximately 4 dB 1 55 GHz OSCILLATOR 7 The 1 55 GHz oscillator is a single transistor oscillator whose frequency is determined primarily by a radial cavity The oscillator frequency is tuned around the center frequency established by the cavity by the positive voltage applied to the voltage variable capacitor A7CR1 from the oscillator driver see block 5 below Changes in the voltage level to this Varactor diode provide a frequency tuning range of approximately 4 MHz refer to paragraph 5 9 for adjustment The oscillator driver is adjusted to prov
132. ions 1 21 8554L RF SECTION MODIFICATIONS 1 22 Hewlett Packard Model 8554L Spectrum Analyzer RF Section with serial prefixes 1101A and below require modification for Tracking Generator compatibility The modification consists of adding two cables to the RF Section The cables provide front panel access to the first and third LO outputs The modification kit HP Part Number 08554 60056 containing all necessary parts and information is available from any Hewlett Packard Sales and Service Office A list of Sales and Service offices is contained in the back of this manual Service Note 8554L 6 containing the modification procedure is included with the modi fication kit After modification the Service Note should be filed with the 8554L Service Manual 1 23 ACCESSORIES SUPPLIED 1 24 Accessories supplied with the Tracking Generator are listed in Table 1 2 RF cables supplied with the Tracking Generator allow opera tion with either the 8554B or 8555A Spectrum Analyzer RF Sections The power cable supplied with the instrument is selected at time of ship ment Cable selection is based on shipping destina Model 8444A tion Figure 2 1 illustrates the different power cable connectors that are currently available 1 25 EQUIPMENT REQUIRED BUT NOT SUP PLIED 1 26 In addition to the accessories supplied with the Tracking Generator a Spectrum Analyzer System is required to complete the Tracking Gen erator Spectrum Analyzer Sy
133. ird LO 500 MHz Norm ally used with 8555A RF Section Parallel with front panel THIRD LO INPUT which is normally used with 8554B RF Section e ACCESSORY OUTLET Line power outlet Con nected to power line module input Provides ac outlet for use by accessory equipment Note See Table 1 4 for HP part numbers of inter connecting power cords Line power module 115 230V 48 440 Hz Line input Connects to external ac power source Supplies ac power to ACCESSORY OUTLET when connected to external power source 115 230V Switch Line voltage slide switch controls power supply input connections Check that switch is set for nominal voltage of ac line To change setting remove power cord from line input 5 Slide protec tive cover aside extract fuse with FUSE PULL 7 and slide switch to desired position Replace fuse with a fuse of the value indicated for the desired switch position Fuse extractor and switch lock Prevents line switch from being actuated until fuse is extracted Line input fuse Rating of fuse to be used is marked near line voltage slide switch setting corresponding to nominal ac supply voltage Figure 3 2 Model 8444A Tracking Generator Rear Panel Controls and Connectors HP 8444A Tracking Generator max Operation 4444 TRACKING GENERATOR 5 1300 wom wets sa m _ v6 vg 5 E Model 8444A
134. kHz keeping signal centered on CRT display with FREQUENCY and FINE TUNE controls 10 Set SCAN WIDTH to ZERO and tune FINE TUNE for maximum signal amplitude 11 Disconnect Test Oscillator from Spectrum Analyzer and connect Tracking Generator OUTPUT to Spectrum Analyzer INPUT 12 Adjust Tracking Generator TRACK ADJ for maximum signal amplitude on display 13 Connect Tracking Generator AUX RF OUTPUT to Frequency Counter Measure and record frequency 8554B 500 10 kHz ____ 8555 10 MHz 10 kHz 14 Repeat steps 6 through 13 at selected frequencies using appropriate signal generator in place of test oscillator 4 12 HP 8444A Tracking Generator max 8444 PERFORMANCE TESTS 4 20 Harmonic Distortion Performance Tests SPECIFICATION Harmonic Distortion Typically 25 dB below output level Nonharmonic spurious sig nals gt 35 dB below output level DESCRIPTION With the Tracking Generator and Spectrum Analyzer operating as a system the RF OUTPUT from the Tracking Generator is observed using a separate spectrum analyzer The output signal is checked for signal level of both harmonic and spurious signals AAD LOY STEP 4 UG 201A U RF OUTPUT TEST SPECTRUM ANALYZER e 222 Cary NUR Ag CABLE ASSEMBLY Figure 4 6 Harmonic Distortion Test Setup EQUIPMENT Spectrum Analyzer HP 8554B or 8555A 8552B 141T Test Spectrum
135. kage coaxial cable with BNC connectors Three 8 each supplied Two required for 8555A Spectrum Analyzer System Three required for 8554B Spectrum Analyzer System Connects FIRST LO to FIRST LO THIRD LO to THIRD LO and SCAN OUTPUT to SCAN IN OUT See paragraph 2 15 and Figure 2 1 1 4 HP 8444A Tracking Generator max Model 8444 General Information Table 1 3 Test Equipment and Accessories 1 of 3 Minimum Specifications Suggested Model Spectrum Analyzer System Frequency Range 500 kHz 1 25 GHz Compatible with Tracking Generator Part of System 8554B or 8555A 8552B 141T Spectrum Analyzer System Frequency markers spaced 100 MHz apart HP 8406A Comb Generator Frequency Accuracy 0 01 Output Amplitude 30 dBm to 1 5 GHz Frequency Comb Generator Spectrum Analyzer System Frequency Range 500 kHz 4 GHz HP 8553B 8555 A 8552B P A T Test Analyzer Amplitude Accuracy 1 dB 141T Spectrum Analyzer System Power Meter Frequency Range 0 01 12 GHz HP 432A Power Meter Accuracy 1 with HP 8478B Therm Power Range 20 to 10 dBm istor Mount AC Voltmeter Frequency Range 10 Hz to 10 MHz Voltage Range 1 mV to 300V Calibration 10 to 2 dB 10 dB between ranges 400 Voltmeter Accuracy 5 at 10 MHz AC Voltmeter Volta
136. ked in the following manner 1 Connect the 500 MHz OUTPUT Third LO OUTPUT Figure D 2 on the rear panel of the 8444A to a 432A Power Meter Adjust L O PWR on Oscillator Assembly A9 to set oscillator output power to 4 dBm 5 dB Disconnect oscillator output from power meter and connect to 5254C Frequency Counter Adjust FREQ ADJ on Oscillator to set frequency to 500 MHz 200 kHz HP 8444A Tracking Generator max Appendix D 5 Check power output again and re adjust if necessary 6 steps 2 through 5 until the two test limits are both met D 13 SECTION VI REPLACEABLE PARTS Page 6 4 Table 6 2 Add the following parts Reference Designation A9 1 A9C2 A9J1 2911 A9HR1 A9A1 1 1 1 2 A9A1L1 A9A101 9 192 A9ATR1 A9A1R2 A9A1R3 A9A2 A9 A2C1 9 2 2 2 9 2 4 A9A2CR1 A9A2CR2 A9A2Q1 A9A2Q2 A9A2R1 A9A2R2 A9A2R3 A9A2R4 A9A2R5 w19 D 4 HP Part Number 08444 60024 0160 2357 0160 2357 1250 0828 08554 00015 0698 7200 08444 60020 0160 2247 0121 0414 08554 00007 1854 0323 1854 0323 0698 3447 0757 0280 0757 0280 08444 60031 0160 2055 0160 2055 0180 0049 0180 0049 1901 0040 1901 0040 1854 0404 1854 0404 2100 1775 0698 3155 0698 3155 0698 0083 0698 0082 08444 60025 Table D 2 Replaceable Parts Description 500 MHz OSCILLATOR ASSEMBLY 1000PF 80 20 500WVDC CER C FXD 1
137. least 30 minutes 4 Adjust TRACK ADJ for maximum signal indication on CRT display 5 Disconnect cable between Tracking Generator RF OUTPUT and Spectrum Analyzer INPUT 6 Connect Thermistor Mount and Power Meter to Tracking Generator RF OUTPUT 7 Connect test lead jumper between A2TP1 and A2TP2 8 Adjust A2R17 NULL ADJ for output level of 0 1 0 dBm indication on Power Meter 9 Remove jumper between A2TP1 and A2TP2 10 Adjust A2R41 0 dBm LEVEL for output level of 0 50 5 dBm indication on Power Meter 11 Adjust Test Oscillator for 10 kHz output 12 Connect Test Oscillator output through 100K ohm resistor to A2TP4 13 Connect AC Voltmeter to 2 1 14 Adjust Test Oscillator output amplitude for an indication of 7 dB 001 VOLTS RANGE on AC Voltmeter 15 Connect AC Voltmeter to A2TP2 16 Adjust A2R7 GAIN ADJ for an indication of 10 dB 001 VOLTS RANGE AC Voltmeter 17 Adjust A2R17 NULL ADJ for Tracking Generator output of 0 dBm 18 Repeat steps 16 and 17 until both levels are obtained 19 Disconnect AC Voltmeter and Test Oscillator 20 Repeat steps 7 through 10 above 21 Connect DC Voltmeter across A2TP1 and A2TP3 COM to A2TP1 and VOLTS to A2TP3 5 12 HP 8444 Tracking Generator max Model 8444 Adjustments ADJUSTMENTS 5 12 Automatic Level Control ALC Check and Adjustment 22 Adjust A2R6 LIMIT SET for an indication of 0 3 on DC Voltmeter
138. lt 1 50 dB lt 1 50 Tune Spectrum Analyzer to 500 MHz and set SCAN WIDTH PER DIVISION to 100 MHz Tune Spectrum Analyzer over frequency range of 50 to 1000 MHz with Tracking Generator MANUAL SCAN control Note and record maximum deviation from reference level set in step 6 above lt 1 50 lt 1 50 dB Tune Spectrum Analyzer to 1200 MHz and set SCAN WIDTH PER DIVISION to 50 MHz Connect Tracking Generator AUX RF OUTPUT to Frequency Counter Plug in Adjust counter and plugin to measure 1250 MHz 8554B RF Section or 1300 MHz 8555A RF Section Tune Spectrum Analyzer over frequency range of 1000 to 1250 MHz 8554L RF Section or 1000 to 1300 MHz 8555A RF Section with Tracking Generator MANUAL SCAN control Note and record maximum deviation from reference level set in step 6 above lt 1 50 dB lt 1 50 dB HP 8444A Tracking Generator max Model 8444A Performance Tests PERFORMANCE TESTS 4 19 Frequency Accuracy SPECIFICATION Frequency Accuracy 15 MHz using Spectrum Analyzer slide rule dial Precision frequency measurements Frequency Accuracy 10 kHz for unknown signals using Tracking Generator AUX RF OUTPUT and an external frequency counter DESCRIPTION The accuracy of the slide rule dial is determined by the RF Section calibration Refer to dial accuracy performance test in the appropriated RF Section Operating and Service manual For precision frequency measurements frequency accuracy is che
139. n from the reference point is measured as the system is tuned over its frequency range The Spectrum Analyzer must meet specification Refer to appropriate RF Section Operating and Service Manual See paragraph 4 16 for Tracking Generator output level accuracy A fairly accurate flatness check can be made using an 8552 IF Section in place of the 8552B IF Section above Operating in LINEAR mode with the signal positioned between the 10 and 30 graticule line two divisions equal approximately 3 dB variation Lo 1 BNC CABLE STEP 14 RF OUTPUT FREQUENCY COUNTER e Gener e 2649 1 222 UG 201A U SCAN IN OUT Figure 4 4 Amplitude Accuracy Test Setup ZQUIPMENT Spectrum Analyzer HP 8554B 8555A 8552B 141T Frequency Counter HP 5245L Frequency Converter HP 5254C BNE Cable IK dete buck eee fhe ee at HP 10503A Adapters ead dod OO hee ek Vesp LI But UG 201A U PROCEDURE 1 Perform preset adjustment procedures paragraph 4 7 for 8554L 8552B 141T Spectrum Analyzer System or paragraph 4 9 for 8555A 8552B 141T Spectrum Analyzer System 2 Connect test setup as indicated in Figure 4 4 and make the following control settings Spectrum Analyzer See paragraph 4 7 or 4 9 Frequency Counter SAMPLE RATE 25
140. nerator and the Spectrum Analyzer is con tained in Section VIII Service Sheet 1 of this manual 3 5 OPERATOR S CHECKS 3 6 Upon receipt of the instrument or when the Tracking Generator is to be used with a different Spectrum Analyzer perform operational adjustment procedures listed in Figure 3 3 or 3 4 3 7 OPERATING INSTRUCTIONS 3 8 General operating instructions are contained in Figures 3 8 and 3 4 These instructions will familiarize the operator with basic operating func tions of the Tracking Generator in use with Spec trum Analyzers Additional operating techniques and information is contained in Figures 3 5 through 3 10 3 9 CONTROLS INDICATORS AND CONNECTORS 3 10 Front and rear panel controls indicators and connectors are identified and briefly described in Figures 3 1 and 3 2 Operational adjustment proce dures are given in Figures 3 3 and 3 4 Additional information to assist the user during instrument operation is given in the following paragraphs 3 11 OPERATING TECHNIOUES 3 12 The following information is provided to acquaint the user with Tracking Generator Spectrum Analyzer operation When a device is placed in the signal path between the Tracking Generator and the Spectrum Analyzer the analy zer detects and displays the frequency response of the device under test The Spectrum Analyzer tuning and scan width settings determine the Tracking Generator output frequency and the re sultan
141. ng the Block Diagram Service Sheet 1 Theory of operation appears on the foldout pages facing each of the foldout schematic diagrams The sche matic diagram circuits are referenced in the theory of operation test by block numbers 8 5 RECOMMENDED TEST EQUIPMENT 8 6 Test equipment and accessories required to maintain the Tracking Generator are listed in Table 1 3 If the equipment listed is not available equip ment that meets the required specifications may be substituted 8 7 TROUBLESHOOTING 8 8 Troubleshooting procedures are divided into two maintenance levels in this manual The first a troubleshooting tree is designed to isolate the malfunction to the defective circuit 8 9 The second maintenance level provides circuit analysis and test procedures to aid in isolating faults to a defective component Circuit descrip tions and test procedures for the second mainten ance level are located on the pages facing the schematic diagrams The test procedures are refer enced to the schematic diagrams by block num bers 8 10 After the cause of a malfunction has been found and remedied in any circuit containing adjustable components the applicable procedure specified in Section V of this manual should be performed After repairs and or adjustments have been made the applicable procedure specified in Section IV of this manual should be performed 8 11 REPAIR 8 12 Factory Repaired Exchange Modules The LSI microcircuit
142. ng Generator 10 MHz power output level and deviation from 0 dBm Power output dBm Deviation dB Tune Spectrum Analyzer FREQUENCY control for an indication of 30 MHz 100 kHz on Frequency Counter Set Spectrum Analyzer SCAN WIDTH to 5 MHz DIVISION and SCAN MODE to EXT CAUTION Reduce Spectrum Analyzer INTENSITY to prevent damage to CRT HP 8444A Tracking Generator max Model 8444A Performance Tests PERFORMANCE TESTS 4 16 Output Level cont d 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Adjust Tracking Generator MANUAL SCAN to tune Spectrum Analyzer to 30 1 MHz Adjust Tracking Generator LEVEL control to set a 1 dBm reference level on Power Meter Rotate Tracking Generator MANUAL SCAN to tune Spectrum Analyzer between 10 and 50 MHz 4 and 4 graticule lines on CRT display Note and record maximum Power Meter deviation from the 1 dBm reference level dB Set Tracking Generator LEVEL control to 0 dBm Measure and record power output level at 50 MHz dBm Set dot on CRT display to CENTER FREQUENCY with Tracking Generator MANUAL SCAN Connect Tracking Generator AUX RF OUTPUT to Frequency Counter Plug in Adjust Spectrum Analyzer FREQUENCY for dial indication of 0 8 GHz and Frequency Counter Plug in for maximum signal level at 0 3 GHz Set Spectrum Analyzer SCAN WIDTH to 50 MHz PER DIVISION and adjust Tracking Generator MANUAL SCAN to position dot
143. ntersects the middle Wadi ORTA horizontal graticule line DISPLACEMENT 77 ___ TE Horizontal Displacement divisions n 1 CHE Use the horizontal displacement to calculate 3 DIV 11 al demodulation sensitivity A a Convert the horizontal displacement divisions into Hertz Example 2 kHz SCAN WIDTH x 0 2 div 400 Hz center FREQUENCY Figure 4 3 Demodulation Sensitivity Measurement b Calculate demodulation sensitivity by dividing the vertical displacement in divisions into the horizontal displacement in Hz 400 Hz Example 133 Hz div 3 divisions Turn SCAN WIDTH to ZERO scan Set FINE TUNE for a response level within the calibrated three division range one division from the top to the center horizontal graticule line Measure the peak to peak deviation and multiply it by the demodulation sensitivity obtained in step 11b above Example 1 2 div p p signal deviation x 188 Hz div 159 6 Hz Residual FM Hz peak to peak HP 8444A Tracking Generator max 8444 Performance Tests PERFORMANCE TESTS 4 18 System Flatness SPECIFICATION Amplitude Accuracy System Frequency Response 1 50 dB DESCRIPTION The Tracking Generator output is viewed on either a 85554 8552 140 or a 8554B 8552B 140T Spectrum Analyzer System operating in the 2 dB LOG mode A reference level is set at 30 MHz calibration point and the deviatio
144. nverter 1 55 oscillator 8 19 Diagram Notes Table 8 3 Schematic Dia gram Notes provides information relative to symbols and values shown on schematic diagrams 8 20 GENERAL SERVICE HINTS 8 21 The etched circuit boards used in Hewlett Packard equipment are the plated through type consisting of metallic conductors bonded to both sides of an insulating material The circuit boards can be either a single layer or multi layer board The metallic conductors are extended through the component holes or interconnect holes by a plating process Soldering can be performed on either side of the board with equally good results Table 8 4 lists recommended tools and materials for use in 8 2 MANUAL SCAN control TRACK ADJ control LEVEL control Sets 20 volt supply level and reference level to 10 volt supply Sets limiting level of PIN diode driver Sets gain of differential amplifier in PIN diode driver circuit Sets PIN diode driver circuit for null Set frequency tuning range of 1 55 GHz oscillator Sets oscillator power level 10 dBm adjustment for LEVEL control 0 dBm adjustment for LEVEL control Adjusts center frequency of 1 55 GHz cavity Adjusts center frequency of 2 05 GHz cavities Adjusts center frequency of 1 55 GHz oscillator cavity repairing etched circuit boards Following are recommendations and precautions pertinent to etched circuit repair work a Avoid unnecessary component substitu tion
145. oad Newmarket 1234 Auckland Tel 75 289 Cable DENTAL Auckland Analytical Medical Only Medical Supplies N Z Ltd Private Bag Norrie and Parumoana Streets Porirua Tel 75 098 Telex 3858 Analytical Medical Only Medical Supplies N Z Ltd 0 Box 309 239 Stanmore Road Christchurch Tel 892 019 Cable DENTAL Christchurch Analytica Medical Only Medical Supplies N 2 Ltd 303 Great King Street 0 8ox 233 Dunedin Tel 88 817 Cable DENTAL Dunedin NIGERIA The Electronics Instrumentations Ltd N6B 770 Oyo Road Oluseun House 5402 ibadan Tel 61577 Telex 31231 TEIL Nigeria Cable THETEIL Ibadan The Electronics Instrumenta tions Ltd 144 Agege Motor Road Mushin 0 Box 6645 Lagos Cable THETEIL Lagos PAKISTAN Mushko amp Company Ltd Ousman Chambers Abdullah Haroon Road Karachi 3 Tel 511027 512927 2894 Cable Karachi Mushko amp Company Ltd 388 Satellite Town Rawalpindi Tel 41924 Cable FEMUS Rawalpindi PHILIPPINES The Online Advanced Systems Corporation Rico House Amorsolo cor Herrera Str Legaspi Village Makati 1510 Metro Manila 65 35 81 85 34 91 85 32 21 Telex 3274 ONLINE RHODESIA Field Technical Sales 45 Kelvin Road North Box 3458 Salisbui Tel 705231 5 lines Telex RH 4122 SINGAPORE Hewlett Packard Singapore Ltd 1150 Depot Road Alexandra Box 58 Singapore
146. ome Kanagawa 243 0462 24 0452 Yokogawa Hewlett Packard Lid Kumagaya Asahi Hachijuni Building 4th Floor 3 4 Tsukuba Kumagaya 360 Tel 0485 24 6563 KENYA Technical Engineering Services E A Ltd Box 18311 Nairobi Tel 55679 556680 557726 Telex 22629 Cable PROTON Medical International Aeradio E A Ltd 19012 Nairobi Airport Nairobi Tel 336055 56 Telex 22201 22301 INTAERIO Nairobi KOREA Samsung Electronics Ltd 15th Floor Oaeyongak Bldg 25 5 1 KA Choong Moo Ro Chung Ku Seoul 23 6811 778 3401 2 3 4 Telex 22575 Cable ELEKSTAR Seoul MALAYSIA Teknik Mutu Sdn Bhd No 2 Lorong 13 6A Section 13 Petaling Jaya Selangor Tel 54994 5496 Telex MA 37605 Protel Engineering 0 Box 1917 Lot 259 Satok Road Kuching Sarawak Em Cable PROTELENG MOZAMBIQUE A N Goncalves Ltd 162 17 Apt 14 Av D Luis Postal 107 Maputo Tel 27091 27114 Telex 6 203 NEGON Mo Cable NEGON NEW ZEALAND Hewlett Packard 2 Ltd 4 12 Cruickshank Street Kilbirnie Wellington 3 0 Box 9443 Courtney Place Wellington Tel 877 199 Cable HEWPACK Wellington Hewlett Packard 2 Ltd Pakuranga Professional Centre 267 Pakuranga Highway Box 51092 Pakuranga Tel 569 651 Cable HEWPACK Auckland Analytical Medical Only Medical Supplies N Z Ltd Scientific Division 79 Cariton Gore R
147. onic spurious signals gt 40 dB below output level Page 4 15 Paragraph 4 20 change to read 12 Note and record maximum amplitude level of harmonic and spurious signals Harmonics lt 25 dBm Spurious lt 40 dBm 7 1 8444A Tracking Manual Changes Model 8444A CHANGE C Pages 5 3 through 5 6 Paragraph 5 9 and Figure 5 2 change to read as follows 5 9 1 55 GHz Oscillator Power Level Frequency Check and Adjustment REFERENCE Service Sheet 3 DESCRIPTION The 1 55 GHz local oscillator is checked for power output level and frequency tuning range Oscillator frequency is determined primarily by the LO cavity with tuning range and power output level determined by the drive voltage from the oscillator driver The oscillator is checked first for power level and then for frequency and tuning range After any adjustments are made the previous checks are repeated FREQUENCY COUNTER POWER METER 357954527 LJ 22 BO CABLE ASSEMBLY DIGITAL VOLTMETER 5 UG914A U UG 201A U DC POWER SUPPLY TEST LEADS STOR MOUNT Figure 7 1 1 55 GHz LO Power Level and Frequency Check and Adjustment Test Setup Manual Figure 5 2 EQUIPMENT Power Meter with HP 84788 Thermistor Mount HP 432A Frequency Counter with HP 5254C Plugin HP 5245L Digital Voltmeter with HP 34
148. or max 8444 Appendix APPENDIX 0960 2038 5086 6025 HP MODEL 8444A TRACKING GENERATOR Serials Prefixed 1147A and Below REQUIRED MODIFICATION WHEN REPLACING A3 When replacing the Amplifier Detector Assembly in the HP Model 8444 serials prefixed 1147A and below a capacitor C3 3300 pF HP Part No 0160 0155 is a required addition for proper instrument operation The capacitor is electrically connected between the RF Diode Signal line and ground For easiest installation connect the capacitor between connector pins XA2 1 and 2 7 Pin 1 is located nearest the instrument front panel APPENDIX B SERVICE NOTE P 08444 60019 HP MODEL 8444A TRACKING GENERATOR Serials Prefixed 1147A and Below REPLACEMENT FOR 7 08444 60003 The HP Part No 08444 60019 assembly is the recommended replacement for the old 08444 60003 assembly Since the old and new assemblies are not directly interchangeable minor modifica tions are required when installing the new A7 The additional parts required for the modification are one each HP 0757 0488 5 11K 1 1 8 W Resistor HP 0757 0439 6 81K 1 1 8 W Resistor HP 0757 0465 100K 1 1 8 W Resistor HP 8150 0449 30 Red No 24 AWG Wire MODIFICATIONS 1 hookup refer to Figures 8 12 and 8 19 Connect the wht brn wire to new b red wire connect between 20V XA1 6 and A7C2 Connect viol
149. or time lt 0 1 sec Harmonic Distortion 25 dB below output level typical Nonharmonic spurious Signals 35 dB below output level Long Term Stability Drift typically less than 30 kHz 10 min 20 kHz for 8558B 10 kHz for 8444A when stabilized after 2 hour warm up Sweep Width 50 kHz to 1000 MHz D9 SECTION OPERATION Sweep Rates Selected by Sweep Time per Division on Spectrum Analyzer 16 internal scan rates from 0 1 m Sec div to 10 sec div in a 1 2 5 sequence Man ual Sweep is available with a front panel control of the 8558B Auto Sweep is automatically controlled by FREQ SPAN DIV RESOLUTION BW and VIDEO FILTER settings PRECISION FREQUENCY MEASUREMENTS An external counter output is provided on the 8444 for precision frequency measurements The frequency of un known signals as well as the frequency of any point on a frequency response curve can be measured The use of the 5300A 5303A Counter is suggested for frequency mea surements to 500 MHz and 5245L 5254C Counter for measurements to 1300 MHz Frequency Accuracy Tracking Generator Output For unknown signals typically less than 3 kHz frequency error after tracking adjustment with 10 kHz BW Tracking drift typically 10 kHz 10 min after 2 hour warmup For points on frequency response curve counter accu racy Residual FM 1 kHz peak to peak for time lt 0 1 sec Counter Mode of Operation Manual Scan Scan determined by front panel
150. ot within 10 to 12 dBm with the LEVEL control fully counterclockwise re fer to paragraph 4 16 Output Level Performance Check and 5 13 for LEVEL contro calibration procedure 4 9 Preset Adjustments 8555A 8552B 141T 8444 System 4 10 Procedure a Apply power to Tracking Generator and Spectrum Analyzer b Turn Spectrum Analyzer INTENSITY control fully CCW c Allow instruments to warm up for at least 30 minutes d Perform Spectrum Analyzer Operational Adjustments 30 MHz Calibration Refer to 8555A RF Section Operating and Service Manual e Connect Spectrum Analyzer FIRST LO OUTPUT to Tracking Generator FIRST LO INPUT f Connect Spectrum Analyzer THIRD LO OUTPUT to Tracking Generator THIRD LO INPUT rear panel connections Connect Tracking Generator RF OUTPUT to Spectrum Analyzer INPUT h Connect Tracking Generator SCAN OUT PUT to Spectrum Analyzer SCAN IN OUT i Set Spectrum Analyzer controls as fol lows INTENSITY 12 o clock approx BAND n 1 2 05 GHz IF FREQUENCY 30 MHz BANDWIDTH 300 kHz SCAN WIDTH PER DIVISION SCAN WIDTH PER DIVISION 100 kHz INPUT ATTENUATION 20 dB TUNING STABILIZER ON SIGNAL IDENTIFIER OFF BASE LINE CLIPPER CCW SCAN TIME PER DIVISION 10 MILLISECONDS LOG LINEAR 10 dB LO
151. ower stripe e g denotes white base yellow wide stripe violet narrow stripe Indicates WARNING HAZARDOUS VOLTAGE Refers serviceman or operator to CAUTIONs in Operating and Service Manual Letter lt Off page connection Number Service Sheet location for off page connection Block numbers reference between text and schematic Assembly ground Chassis ground HP 8444A Tracking Generator max Service CAUTION Do not use a sharp metal object such as an awl or twist drill for this purpose Sharp objects may damage the plated through conductor d After soldering remove excess flux from the soldered areas and apply a protective coating to prevent contamination and corrosion 8 22 Component Replacement The following procedures are recommended when component replacement is necessary a Remove defective component from board b If component was unsoldered remove solder from mounting holes with a suction device or a wooden toothpick c Shape leads of replacement component to match mounting hole spacing d Insert component leads into mounting holes and position component as original was positioned Do not force leads into mounting holes sharp lead ends may damage the plated through conductor Model 8444A NOTE Although not recommended when both sides of the circuit board are accessible axial lead components such as resistors and tubular capacitors can be replaced without unsoldering Clip leads
152. pply voltage Any difference is due to leakage current through the transistor and in general the smaller this current the better the transistor If the collec tor voltage does not change the transistor has either an emitter collector short circuit or emitter base open circuit 8 27 Transistor and Diode Markings Figure 8 2 illustrates examples of diode and transistor mark ing methods In addition the emitter lead for bipolar transistors is identified on the printed circuit boards 8 28 OPERATIONAL AMPLIFIERS 8 29 Operational amplifiers are used to provide such functions as summing amplifiers offset ampli fiers buffers and power supplies The particular function is determined by the external circuit connections Equivalent circuit and logic diagrams for type 741 operational amplifiers are contained in Figure 8 3 Circuit A is a non inverting buffer amplifier with a gain of 1 Circuit B is a non B Transistor Biasing V N COMMON COMMON BASE EMITTER COMMON COLLECTOR CHARACTERISTIC Input Impedance 300 2200 500 15000 20KQ 500K Q Output 300KQ2 500 30 50 502 10000 Voltage Gain 500 1500 300 1000 lt Current Gain lt 1 25 50 25 50 Power Gain 2048 30dB 2598 40dB 1048 20 48 Emitter Follower CUTOFF CONDUCTION NPN MAIN CURRENT COLLECTOR CONTROINS CURRENT CU
153. put 20 Output 103 5 115 126 5V Set ac line voltage to 115 volts Adjust 1 14 for 20 00 20 mV at test point 1 Disconnect ac voltmeter from connector J6 Connect digital voltmeter to A7C3 and chassis ground 10 volt test point Measure and record voltage level Voltage level should be 10 0 0 5 volts 10 0 Output Set HP 400E AC Voltmeter RANGE to 001 VOLTS full scale and measure ac ripple on 20 and 10 volt sense lines Ripple should be less than 200 uV Measure and record ac ripple between power supply sense lines and chassis ground 20 Volt Output pin 6 10 Volt Output A7C3 Remove input line power and replace cover over power line module Replace right side cover and top cover the dc supplies are out of tolerance refer to Service Sheet 5 for trouble isolation procedure 5 3 HP 8444A Tracking Generator max Adjustments Model 8444A ADJUSTMENTS 5 9 1 55 GHz Oscillator Power Level Frequency Check and Adjustment REFERENCE Service Sheet 3 DESCRIPTION The 1 55 GHz local oscillator is checked for power output level and frequency tuning range Oscillator frequency is determined primarily by the LO cavity with tuning range determined by the drive voltage from the oscillator driver The oscillator is checked first for power level and then for fre quency and tuning range FREQUENCY COUNTER POWER METER 357994327 DIGITAL VOLTMETER 8
154. r mme 0 dBm MANUAL SCAN CCW c Connect unit under test between Tracking Generator RF OUTPUT and Spectrum Analyzer RF INPUT d Connect Tracking Generator AUX RF OUTPUT to Frequency Counter input e Connect Tracking Generator SCAN OUTPUT to Spectrum Analyzer SCAN IN OUT f Connect Tracking Generator FIRST LO INPUT to Spectrum Analyzer FIRST LO OUTPUT and THIRD LO INPUT to THIRD LO OUTPUT 3 10 Model 8444A g Note point of interest on CRT display h Set Spectrum Analyzer SCAN MODE to EXT and rotate Tracking Generator MANUAL SCAN control clockwise to point of interest i Note and record frequency j Spectrum Analyzer SCAN MODE to INT Note The CRT trace dot can be moved in either direction by the Tracking Genera tor MANUAL SCAN control For best frequency accuracy approach frequency measurement point while tuning the MANUAL SCAN control in the clockwise direction Figure 3 10 Precision Frequency Measurement CRT Display HP 8444 Tracking Generator max Model 8444 Performance Tests SECTION IV PERFORMANCE TESTS 4 1 INTRODUCTION 4 2 This section contains preset adjustment proce dures and performance tests for the Model 8444A Tracking Generator and Model 85541 8555A 8552B 141T Spectrum Analyzer System Preset adjustments for the 8444A 8554B 8552B 141T system are given in paragraph 4 7 Preset adjust ments for the 8444A 8555A 8552B 141T are given in
155. rcuit Schematic Diagram 8 18 5 First Converter Assembly Illustrated Parts Breakdown 8 19 7 1 55 GHz Osicllator Assembly Illustrated Parts Breakdown 0 1 500 MHz LO Mounting Location and Output Port for the 8444A Option 058 D 2 Location of 500 MHz LO OUTPUT BNC Connector Added on Rear Panel of the 8444A Option 058 0 3 9 500 MHz Oscillator Assembly Schematic HP 8444A Tracking Generator max Page 1 5 1 6 8 5 8 6 8 1 8 9 8 9 8 10 8 11 8 12 8 13 8 14 8 15 8 15 8 15 8 16 8 17 8 17 8 19 8 19 8 20 8 21 D 6 D 7 D 8 8444 Table 1 1 System Specifications 1 2 Accessories Supplied 1 3 Test Equipment and Accessories 1 4 Operating Accessories 4 1 Performance Test Record 5 1 Check and Adjustment Test 6 1 Reference Designations and Abbreviations 6 2 Replaceable Parts LIST OF TABLES Page 13 1 4 1 5 1 7 4 16 5 15 6 2 6 4 Contents Table Page 6 3 Code List of Manufacturers 6 8 7 1 Manual Changes Serial Number 27 1 8 1 Factory Selected Components 8 2 8 2 Adjustable Components 8 2 8 3 Schematic Diagram Notes 8 3 8 4 Etched Circuit Soldering Equipment 8 4 D 1 8444 System Specifications With Option 058 D 1 D 2 Replaceable Parts D 4 8444 Tracking Generator max General Information Model 8444A MODEL 8444A 5060 8739 8120 1348 08444 60018 3
156. ron SACILy M Bolivar 177 1066 Buenos Aires Tel 30 4846 34 9356 34 0460 Telex 17595 BOLIVIA Casa S A otos 1130 x 500 30 53221 CWC 5298 1TT 3560082 KAVLIN BRAZIL Hewlett Packard do Brasil lec Ltda Alameda Rio Negro 750 Alphaville 06400 Barueri SP 429 3222 Cable HEWPACK Sao Paulo Hewlett Packard do Brasil Le C Ltda Rua Padre Chagas 32 90000 P rto Alegre AS Tei 0512 22 2998 22 5621 Cable HEWPACK Poto Alegre Hewlett Packard do Brasil Ltda Rua Campos 53 Copacabana 20000 Rlo de Janeiro RJ 257 80 94 000 021 Telex 391 212 1905 HEWP BR Cable HEWPACK Rio de Janeiro CHILE Calcagni y Metcalfe Lida Alameda 580 01 807 Casilla 2118 Santiago 1 398613 Telex 3520001 CALMET Cable CALMET Santiago COLOMBIA Instrumentaci n Henrik Langebaek amp Kier S A Carrera 7 No 48 75 Apartado A reo 5287 Bogot D E Tel 69 88 77 Telex 044 400 Cable AARIS Bogot Instrumentacion Langebaek Kier S A Apartado Aereo 54098 Medellin Tet 304475 COSTA RICA Cient fica Costarricense S A Avenida 2 Calle 5 San Pedro de Montes de Oca Apartado 10159 San Jose Tel 24 38 20 24 08 19 Telex 2367 GALGUR CR Cable GALGUR ECUADOR Computadoras y Equipos Electr nicos 0 Box 6423 CCI Eloy Alfaro No 1824 3 Piso Quito Tel 453 482 Telex 2548 CYEDE ED Cable Sagita Quito Medical Only Hospitalar S A
157. rter Passband CRT Display 5 7 Automatic Level Control ALC Check and Adjustment Test Setup 5 8 Level Control Calibration Check ana Adjust ment Test Setup 7 1 1 55 GHz LO Power Level and Check und Adjustment Test Setup Page 1 0 1 2 2 2 3 2 3 3 3 4 3 6 3 8 3 8 3 9 3 9 3 9 3 10 4 3 4 7 4 8 4 9 4 11 4 13 4 15 4 15 5 2 5 4 5 6 5 8 5 9 5 10 5 11 5 13 1 2 Figure 1 2 First Converter Circuits Schematic Diagram 7 3 1 55 GHz Oscillator Assembly Illustrated Parts Breakdown 8 1 Transistor Operation 8 2 Examples of Diode and Transistor Marking Methods 8 3 Operational Amplifier Equivalent Circuit 8 4 Major Assembly Locations 5 8 5 Adjustment and Test Point Locations 8 6 Tracking Generator Spectrum Analyzer Simplified Block Diagram 8 7 Tracking Generator Block Diagram with Spectrum Analyzer Interconnections 8 7A Troubleshooting Tree 8 8 Tracking Generator Troubleshooting Block Diagram 8 9 Mixer Diode Forming Dimensioisi in inches 8 10 Modulator Oscillator Driver Assy 2 Component Locations 8 11 Amplifier and Pin Diode Modulator Ai A4A1 Component Locations 8 12 First Converter Circuits Schematic Diagram 8 13 1 RF Output Connector Exploded View 8 14 A2 Modulator Oscillator Driver Assy Component Location 8 15 Second Converter Circuits Schematic Diagram 8 16 A1 Power Supply Assy Component oration 8 17 Power Supply and Input Ci
158. s assumed that the spectrum analyzer is equipped with either an 8554B or 8555A Tuning Section 8552A or 8552B IF Section 140T or 141T Display Section SWEPT FREQUENCY RESPONSE MEASUREMENTS The tracking generator is used as a signal source to measure the frequency response of a device Dynamic Range gt 90 dB from spectrum analyzer 1 dB gain compression point to average noise level approximately 10 dBm to 100 dBm Spurious responses not displayed Gain Compression For 10 dBm signal level at the input mixer gain compression lt 1 dB Average Noise Level gt 102 dBm with 10 kHz IF bandwidth Absolute Amplitude Calibration Range Spectrum Analyzer Log From 122 dBm to 10 dBm 10 dB div on a 70 dB display or 2 dB div on 16 dB display 8552A has 10 dB div only Linear From 0 1 uV div to 100 mV div 8555 20 mV div 8554B in a 1 2 sequence on an 8 division display Tracking Generator Drive Level to Test Device 0 to 10 dBm continuously variable 0 dBm cali brated to 0 5 dB at 30 MHz Frequency Range 500 kHz to 1250 MHz with 8554B and 10 MHz to 1300 MHz with 8555 Scan Width Determined by Spectrum Analyzer Controls Per Division With 8555A 16 calibrated scan widths from a 2 kHz div to 200 MHz div in a 2 5 10 se quence With 8554B 15 calibrated scan widths from a 2 kHz div to 100 MHz div in 2 5 10 sequence Full Sean 0 1250 MHz with 85548 0 1300 MHz with 8555
159. s same as paragraph 3 18 except analyzer gain adjusted so that the top graticule line represents 0 dB return loss or total reflection e g a short or open circuit Return loss is greater than 15 dB 00 18 1 44 over the filter range of 0 to 23 MHz acl Figure 3 8 Swept Return Loss Measurement CRT Display 3 21 Amplifier Gain and Bandwidth Measurement 3 22 Figure 3 9 illustrates the CRT display for a to 400 MHz amplifier with gain of approxi mately 19 dB A reference level is first established by connecting the Tracking Generator output to the Spectrum Analyzer through a 30 dB attenuator and scanning over the range of interest The ampli fier is then connected between the Tracking Gener ator and the Spectrum Analyzer and the same Operation frequency range scanned The Spectrum Analyzer 8554B set to full scan 0 1250 provides a CRT display indication as follows 3 dB bandwidth approximately 500 MHz level at 1 graticule line and zero gain point of approximately 1025 MHz a 30 dB Coaxial Attenuator installed at Tracking Generator RF OUTPUT b Spectrum Analyzer 85548 control settings BANDWIDTH 300 kHz SCAN WIDTH 0 1250 MHz INPUT ATTENUATION 10 dB SCAN TIME PER DIVISION 10 MILLISECONDS LOG LINGAR 45 5 5 xxasasesessssswws LOG LOG REF LEVEL 10 dBm VIDEO SCAN MODE 4 5
160. ssembly A9 is added to the Main Deck of an 8444 The 500 MHz LO Output is brought out through a BNC connector on the rear panel directly above the BNC connector serving as the output of the THIRD LO INPUT Power supply voltages for the A9 500 MHz Oscillator Assembly are taken from the PC connector X A1 on the bottom of the 8444A Main Deck D16 Figure D 1 is a top view of the 8444A including the Option 058 500 MHz A9 Oscillator Assembly with its BNC connector on the rear panel D17 Figure D 2 shows the rear panel of an 8444A Option 058 with the added 500 MHz OUTPUT BNC connector above the THIRD LO INPUT connector D18 Figure D 3 is a schematic diagram of the 500 MHz Oscillator used with Option 058 a capacitance multiplier used as additional filter for the 8444A 20V power supply and an adjustable current regulator for the 10V 8444 power supply D 5 HP 8444A Tracking Generator max Appendix D Model 8444A J9 BNC REAR PANEL 19 500 MHz OUTPUT CONNECTOR A5 OUTPUT CABLE J8 underneath 10 20 LEADS 500 MHz OSCILLATOR AY 9 1 OSCILLATOR OUTPUT MOUNTING LOCATION Figure D 1 500 MHz LO Mounting Location and Output Port for the 8444A Option 058 D 6 HP 8444A Tracking Generator max Model 8444 Appendix D 500 MHz OUTPUT THIRD LO INPUT When using the 8444A with an 8558B 180 Spectrum Analyzer the 8444A 500 MHz OUTPUT and its THIRD LO INPUT must be interconnected with a short cable Figure D 2
161. stem The Tracking Generator is compatible with either the 8554B 8552 140 series Spectrum Analyzer System or the 8555 8552 140 series Spectrum Analyzer System Refer to paragraph 1 11 for modifications to early model Spectrum Analyzer Systems For precision frequency measurements a frequency counter is required for use with the Tracking Generator Spectrum Analyzer System Operating accessories are listed in Table 1 4 1 27 WARRANTY 1 28 The Hewlett Packard Model 8444A Tracking Generator is warranted and certified as indicated on the inner front cover of this manual For further information contact the nearest Hewlett Packard Sales and Service office addresses are provided at the back of this manual 1 29 RECOMMENDED TEST EQUIPMENT 1 30 Table 1 3 lists the test equipment and acces sories required to check adjust and repair the Tracking Generator If substitute equipment is used it must meet the Minimum Specifications listed in Table 1 3 Table 1 2 Accessories Supplied HP Part Number Name Description 8120 1348 Line Power Cable 5060 8739 Rack Mounting 08444 60017 Interconnect Cable 08444 60018 Interconnect Cable 712 feet 3 wire AC Line Cord Hardware and parts for mounting instrument in 19 inch rack Coaxial cable for interconnection between AUX connector on Display Section and THIRD LO INPUT on Tracking Generator For use with 8555A Spectrum Analyzer System 18 inch low lea
162. t CRT display The type of device control settings and typical display is provided for each of the following measurements Crystal Filter Measurement Para 3 13 Bandpass Filter Measurement Para 3 15 Low Pass Filter Measurement Para 3 17 Swept Return Loss Measurement Para 3 19 94 0 c amp Amplifier Gain and Bandwidth Measurement Para 3 21 f Precision Frequency Measurement Para 3 23 3 1 8444 Tracking Generator max Operation Model 8444A FRONT PANEL ON OFF Controls primary power to Track ing Generator Light glows when switch is energized Type bulb For access to bulb switch to OFF and pull button straight out MANUAL SCAN Provides manual tuning of Spec trum Analyzer Controls voltage level at SCAN OUT PUT 8 below Scan trace on CRT determined by position of MANUAL SCAN control For MANUAL SCAN operation connect cable between Tracking Generator SCAN OUTPUT and Spectrum Analyzer SCAN IN OUT Set Spectrum Analyzer SCAN MODE switch to EXT Vary MANUAL SCAN control to tune analyzer through selected SCAN WIDTH TRACK ADJ Adjusts frequency of 1 55 GHz tor in Tracking Generator so that the RF OUTPUT 5 tracks the frequency tuning of the Spectrum Analyzer Control adjusted for maximum amplitude indication of trace on CRT display Ten turn control provides adjustment of frequency over a range of approximately 4 MHz LEVEL
163. t of both sup plies is normal check A1CR8 A1CR9 195 removing A2 assembly for access to Al components Also check for a short circuit external to the power supply and for a shorted 1 5 Check 1 5 by measuring voltage drop across A1R10 It should be 0 Vdc 100 mV drop indicates a shorted capacitor A1C5 If the output voltage is over 20 volts and cannot be cor rected with the VOLTS adjustment A1R14 ground anode of A1CR5 and check for an output level of 10 to 15 volts indicating associated circuitry is functioning properly If it is outside this range check emitter base voltages 101 192 193 Remove ground from anode of 1 5 perform adjustment procedures in paragraph 5 8 Troubleshoot the 10 volt supply in a similar manner Check input to operational amplifier remove Q2 and check voltage at emitter of 197 remove 197 and repeat voltage measurement at emitter of 197 Check 1 9 for short HP 84444 Tracking Generator max Model 8444 Model 8444 Figure 8 16 1 Power Supply Assy Component Location HP 8444A Tracking Generator max LINE ON OFF SWITCH AND POWER LINE MODULE WIRING 20 10 Land 20 POWER LINE MODULE 8 LINE POWER INPUT ACCESSORY LINE POWER OUTLET NOTES REFERENCE DESIGNATIONS SENSE 1 SEE SCHEMATIC DIAGRAM NOTES TABLE 8 3 REFERENCE DESIGNATIONS WITHIN OUTLINED
164. t the first appearance of the part number in the list 67 ORDERING INFORMATION 6 8 order a part listed in the replaceable parts table give the Hewlett Packard part number indi cate quantity required and address the order to the nearest Hewlett Packard office 6 9 To order a part that is not listed the replaceable parts table include the instrument model number instrument serial number the des cription and function of the part and the number of parts required Address the order to the nearest Hewlett Packard office 6 1 HP 8444A Tracking Generator max 8444 Table 6 1 Reference Designations and Abbreviations modulator momentary metal oxide semiconductor millisecond mounting meter indicating device millivolt millivolt ac millivolt dc millivolt peak millivolt peak to peak millivolt rms milliwatt multiplex mylar microampere microfarad microhenry micromho microsecond microvolt microvolt ac microvolt dc microvolt peak microvolt peak to peak microvolt rms micro watt no connection normally closed neon negative nanofarad nickel plate normally open nominal normal negative positive negative negative positive zero zero tempera ture coefficient not recommended for field replace ment not separately replaceable nanosecond nano watt order by descrip tion outside diameter oval head OP AMPL operational amplifier
165. the parts list will be in upper case MULTIPLIERS Abbreviation T G M k da d c m n p f a Prefix tera giga mega kilo deka deci centi milli micro nano pico femto atto Multiple 1012 109 106 103 10 10 1 10 2 1073 1076 1079 10 12 107715 10 18 8444A Tracking TWT U UF Replaceable Parts time delay terminal thin film transistor thread through titanium tolerance trimmer transistor transistor transistor television television interference traveling wave tube micro 108 used in parts list microfarad used in parts list ultrahigh frequency unregulated volt voltampere volts ac variable voltage controlled oscillator volts de volts dc working used in parts list volts filtered variable frequency oscillator very high fre volts peak volts peak to peak volts rms voltage standing wave ratio voltage tuned oscillator vacuum tube voltmeter volts switched working inverse voltage wirewound without yttrium iron garnet characteristic 6 3 Replaceable Parts Model 8444A Table 6 2 Replaceable Parts Designation Al 08444 60001 BOARD ASSY POWER SUPPLY 08444 60001 ALCI 0160 3460 CER 0 05 UF 80 20 100VDCW 023 1011 50325 22 Alc 0180 0116 CzFXD ELECT 6 8 UF 10 35VDCW 1500685 X903582 DYS ALCS 0160 2199 C FXD MICA 30 PF 5 0160 2199 ALC
166. tt Packard intercontinental 3200 Ave Palo Alto 94304 Tel 415 856 1501 910 373 1267 Cable HEWPACK Palo Alto Telex 034 8300 034 8493 CANADA ALBERTA Hewlett Packard Canada Ltd 11620A 168th Edmonton T5M 319 Tel 1403 452 3670 TWX 610 831 2431 Hewlett Packard Canada Ltd 210 7220 Fisher 51 S E Calgary 12H 248 Tel 403 253 2713 610 821 614 BRITISH COLUMBIA Hewlett Packard Canada Ltd 10691 Shellbridge Way Richmond V6X 2W7 Tel 604 270 2277 TWX 610 925 5059 MANITOBA Hewlett Packard Canada Ltd 380 550 Century St Winnipeg 0 1 Tel 204 786 6701 TWX 610 671 3531 NOVA SCOTIA Hewlett Packard Canada Ltd 800 Windmill Road Dartmouth B3B 111 Tel 902 469 7820 TWX 610 271 4482 ONTARIO Hewlett Packard Canada Ltd 1020 Morrison Dr Ottawa K2H 8K7 Tel 613 820 6483 610 563 1636 Hewlett Packard Canada Ltd 6877 Goreway Drive Mississauga L4V 1M8 Tel 416 678 9430 TWX 610 492 4246 QUEBEC Hewlett Packard Canada 14 275 Hymus 810 Pointe Clalre H9R 1G7 Tel 514 697 4232 TWX 610 422 3022 TLX 05 821521 HPCL FOR CANADIAN AREAS NOT LISTED Contact Hewlett Packard Canada Ltd in Mississauga CENTRAL AND SOUTH AMERICA ARGENTINA Howler Argentina A Av Leandro N Alem 822 12 1001 Buenos Aires Tel 31 6063 4 5 6 Telex 122443 AR CIGY HEWPACKARG Biot
167. ustment procedures for these components are contained in Section V of this manual 8 16 Servicing Aids on Printed Circuit Boards Servicing aids on printed circuit boards include test points transistor designations adjustment callouts and assembly part numbers with alpha numerical revision information 8 17 Part Location Aids The location of chassis mounted parts and major assemblies are shown in Figures 8 4 and 8 5 8 18 The location of individual components mounted on printed circuit boards or assemblies are shown on the appropriate Service Sheet The part reference designator is the assembly designa tion plus the part designation Example A1R1 is R1 on the A1 assembly For specific component description and ordering information refer to the replaceable parts table in Section VI 8 1 HP 8444A Tracking Generator max Service Model 8444A Table 8 1 Factory Selected Components ALC Differential Amplifier A2R8 A4A1R11 PIN Diode Modulator Center GAIN ADJ control Set range of Modulator Table 8 2 Adjustable Components R1 20 volt circuit R2 Oscillator driver R3 ALC reference driver 1 14 20 volt power supply A2R6 A2R7 PIN diode driver PIN diode driver A2R17 A2R26 PIN diode driver 1 55 GHz oscillator driver A2R27 A2R40 A2R41 A5ADJ 1 2 3 ADJ 1 1 55 GHz oscillator driver ALC reference diode circuit ALC reference diode circuit First converter First co
168. w Refer to Service Sheet 2 for overall troubleshooting procedure EQUIPMENT REQUIRED Digital Voltmeter 3440 44 Frequency Counter HP 5245L 5254B PowerMeter EE ROM HP 432 8478 Spectrum Analyzer System HP 8554B or 8555A Selectro to BNC Cable HP 11492 60001 Adapter BNC Jack to BNC UG 914A U HP 1250 0080 De HP 412A 500 MHz AMPLIFIER PIN DIODE MODULATOR ASSEMBLY A4 With power removed disconnect CP1 at 4 and W6 at 442 Remove the eight screws securing the cover of the A4 assembly The A4AI assembly is mounted on the underside of the A4 cover Invert the cover and 4 1 assembly Connect CP1 to A4J1 and W6 to A4J2 Connect a ground strap between the cover and chassis ground Position the assembly so that the voltage leads and signal lead are not shorted to ground Apply power to the Tracking Generator Measure the voltage drop across each of the PIN diodes With no 500 MHz input signal to the 500 MHz amplifier the voltage drop across each diode should be 0 8 0 2 Vdc Measure the emitter base and collector voltages for transistors A4A1Q1 through Q3 and compare with typical values shown on the schematic diagram Troubleshoot stage or stages with voltage levels that do not compare with typ
169. xternal counter output is provided on the 8444A for precision frequency measurements The frequency of unknown signals as well as the frequency of any point on a frequency response curve can be measured The use of the HP 5300A 5303A Counter is suggested for frequency measurements to 500 MHz and the HP 5245L 5254C Counter for measurements to 1300 MHz Frequency Accuracy For unknown signals 10 kHz Tracking drift typically 5 kHz 10 min after 2 hour warmup For points on frequency response curve counter accuracy Residual Counter Mode of Operation Manual Scan Scan determined either by front panel control of 85528 IF Section or by external scan signal provided by the 84444 Zero Scan Analyzer is fixed tuned receiver Coun ter reads center frequency to accuracy of tracking drift Counter Output Level 0 1 V rms GENERAL SPECIFICATIONS Temperature Range Operation 0 to 55 C storage 40 C to 75 C Power 115V and 230V 48 to 440 Hz 12 watts max 1 3 HP 8444A Tracking Generator max General Information MANUAL SCAN control on the Tracking Genera tor allows manual tuning of the Spectrum Analyzer Tracking Generator System The ampli tude of the Tracking Generator output is adjust able over a 0 to 10 dBm range by a front panel vernier control The output level is calibrated at 30 MHz to 0 0 5 dBm and maintained by an auto matic level control circuit Refer to Table 1 1 for system performance specificat
170. y These checks verify proper operation of the power supplies MULTIFUNCTI ON VOLTMETER 9 0 el CABLE AC ASSEMBLY STEP 10 AC VOLTMETER Figure 5 1 Power Supply Check and Adjustment Test Setup EQUIPMENT Digital Voltmeter with 3443A Plug in 3440A AC Voltmeter Multifunction HP 410C Variable Voltage Transformer General Radio WOMT3A AG Voltmeter 5 24044 GAS Soa Sgn Ae PV dI UR VEU She HP 400E Cable Assy terminated with probe and alligator clip HP 10501 Cable Assy dual banana plug to probe and alligator clip HP 11003A PROCEDURE 1 Connect test setup as indicated in Figure 5 1 2 Remove top cover and right side cover from Tracking Generator 3 Connect digital voltmeter test leads to 1 and chassis ground 4 Remove shield from power line module and connect voltmeter HP 410 across the outside terminals of the ACCESSORY OUTLET connector J6 The outside terminals of 46 are connected by the 98 and 908 color coded wires to the power line module 5 2 HP 8444A Tracking Generator max Model 8444 Adjustments 5 10 11 12 13 ADJUSTMENTS Apply power to the Tracking Generator Measure and record the 20 volt output Vary the input ac line voltage from 103 5 to 126 5 volts The 20 volt regulated output should not vary more than 20 mV AC In
171. z IF EREQUENGY ad sod 2 Auro haat eut PIRE E E we gos fen RE 30 MHz BANDWED EH 4 4 57246448 Be de dU ob eee Ek 100 kHz SCAN WIDTH Gees ee ES cee ZERO 5 11 HP 8444A Tracking Generator max Adjustments Model 8444A ADJUSTMENTS 5 12 Automatic Level Control ALC Check and Adjustment cont d INPUT ATTENUATION 24 4 X 3o x bee RN E a 10 dB TUNING STABLUZER 52285 a aoe Ge ae Ea A ON SIGNAL IDENTIFIER chs eee ae es elk Se OFF BASE LINE sr Sos Max CCW SCAN TIME PER DIVISION 10 MILLISECONDS LOG REEJLEVXEL u1 ern el ab ad 10 dBm LOG LISEN BAR quos ee caw ae ear tec LOG VIDEO FILTER doa ERES Ak ee Oe eG OFF bed ned a Se ed INT SCANCPRIGGER b ose qug ditupeRu awed So eue AUTO Tracking Generator DRM Bao Be Ses EY Gr A ON cerika nee ense y Peak signal indication on CRT LEMEL Scare are lee Ree ode re Nee 0 dBm 3 Allow instruments to warm up and stabilize for at
172. z OSCILLATOR ASSEMBLY A7 Field repair of the oscillator assembly is not recommended Component lead lengths are critical If components are replaced in the field note installation A1 A7 AT1 AT3 Tracking Generator Troubleshooting Block Diagram SERVICE SHEET 2 HP 8444A Tracking Generator max Service 8 14 SERVICE SHEET 3 cont d of component to be replaced and install new component in identical manner When either assembly or components are replaced perform oscillator adjustment procedure paragraph 5 9 See Figure 8 19 for illustrated parts breakdown 1 55 GHz OSCILLATOR DRIVER See paragraph 8 30 for operational amplifier troubleshooting procedure To isolate the operational amplifier from the output amplifier A2Q8 remove the right side panel and disconnect the 91 wire from A7C2 and connect a jumper between A2TP5 and the junction of A2R32 and pin 6 of A2U1 Adjust TRACK ADJ control fully counterclockwise Compare voltage at 201 pin 2 with voltage at pin The voltage levels should not differ more than 10 mV and should be approximately 0 If voltage levels are correct adjust A2R27 MIN TUNE for a voltage level of 6 1 at A2U1 pin 6 If the voltage levels are not correct and or the MIN TUNE control has no effect on the output level replace A2U1 Remove jumper from between A2R32 U1 pin 6 and A2TP5 Compare voltage levels at the emitter base collector of A2Q8 To check driver voltage gain adjust T

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