Wavetek 171, User Manual

Page 1: ...MODEL 171 SYNTHESIZER FUNCTION GENERATOR y f 9wff rj frj ff9 A AVETEK...

Page 2: ...LY FOR INSTRUMENT OPERATION AND MAINTENANCE THE INFORMATION IN THIS DOCUMENT MAY NOT BE DUPLICATED IN ANY MANNER WITHOUT THE PRIOR APPROVAL IN WRITING OF WAVETEK WAVETE SAN DIEGO 9045 Balboa Ave San D...

Page 3: ...defective as a result of misuse improper repair or abnormal conditions or operations repairs will be billed at cost Wavetek assumes no responsibility for its product being used in a hazardous or dange...

Page 4: ...on Generator Operation Synthesizer Operation Monitoring the Synthesizer Function Generator CIRCUIT DESCRIPTION 3 3 3 3 3 3 3 4 3 4 4 1 FUNCTION GENERATOR 4 1 4 2 FREQUENCY CONTROL 4 1 4 3 WAVEFORM OUT...

Page 5: ...t covers removed This should be done only by qualified personnel aware of the electrical hazards The instrument power receptical is connected to the instrument safety earth terminal with a green yello...

Page 6: ...available Control Generator operates in continuous mode Frequency is controlled manually by dial or digital switch or externally thru VCG input voltage Digital switch is operable between 0 1000 and 1...

Page 7: ...m per degree C Internal Frequency Standard 4 MHz crystal with an aging rate of 20 ppm per year Locking Time Within 10 of final frequency in 100 ms within 0 01 of final frequency on X 1K X lOK X lOOK a...

Page 8: ...kout procedure verifies the generator operation If a malfunction is found refer to the Warranty in the front of the manual An oscilloscope counter three short lengths of 50Q coax cable a SQQ feedthru...

Page 9: ...thru X 1M return to X 1 Vary from 2 0 to 2 return to 2 Connect a 0 to 2V source to the VCG IN BNC Vary the voltage positively Dial 2 0 Observe Waveform offset negatively then positively clipping may o...

Page 10: ...uency output is determined by the dial FREQ MULT and VCG voltage SECTION 3 OPERATION Dial Digital Switch Selector Places the instrument in either function generator dial controlled or synthesizer digi...

Page 11: ...mV p p Not specified Goon OUT and son OUT Connectors 600n OUT and 50n OUT provide variable fre quency and amplitude v G and DC Maximumsignal amplitude is 10Vp p with matching loads 20V p p into open c...

Page 12: ...ts the capability of driving a 50Q load 3 2 2 Manual Function Generator Operation For basic operation select the waveform frequency and amplitude The following steps demonstrate manual control of the...

Page 13: ...provide the up to 1000 1 frequency sweep With the dial set to 002 excursions between OV and 2V at VCG IN provide the up to 1000 1 sweep within the set frequency range 3 2 4 Synthesizer Operation For...

Page 14: ...AMPLIFIER L PHASE DETECTOR DIODE GATE FREQ MULTSW 1 HYSTERESIS SWITCH TTL SYNC _______ SYNTHESIZER LOOP FREQUENCY CREF Figure 4 1 Function Generator Block Diagram SINE CONVERTER lDC AMPLITUDE DC OFFSE...

Page 15: ...triangle buffer amplifier is a unity gain amplifier whose output is fed to the hysteresis switch as well as to the sine SECTION 4 CIRCUIT DESCRIPTION generates the triangle waveform as shown in figure...

Page 16: ...difference in frequency between the two inputs This difference signal is used to control a voltage controlled oscillator VCO The VCO output signal is fed back to the phase detector where th VCO freque...

Page 17: ...on generator synthesizer mode switch furnishes the ground signal CLK Kl LL CLK Kl LL stops synthesizer loop activity when the instrument is in function generator mode or set on X 1 a dial only range L...

Page 18: ...cause it supports front and rear panels SECTION 5 CALIBRATION 5 4 CALIBRATION After referring to the following preliminary data perform calibration as necessary per table 5 1 If performing partial cal...

Page 19: ...e while adjusting R42 8 Dial 01 R60 FREQ MULT X 10 Scope sweep 0 1s div de triggering 9 Frequency Counter Dial 2 0 R32 Best frequency ac accuracy FREQ MULT X 1 curacy over X 1 thru X 10K thru X 10K 10...

Page 20: ...ding on thru 0 9999 counter 18 Spectral Spectrum Function Spurious signals Set 3580A controls purity Analyzer Digital Switch 1 9999 below 70 dB for a 3 Hz band Noise floor be width with min low 60 dB...

Page 21: ...d as a switch may have a few volts reverse bias voltage If the collector and emitter voltages are the same but the base emitter voltage is less than 500 inV forward voltage or reversed bias the transi...

Page 22: ...CHECK GENERATOR MODE FIGURE 6 2 VOLTAGE ATTPS APPROX CHECK VARY DIGITAL SWITCH SETTING 1 0 5 TO 5V PROPOR i FN FIGURE6 4 SHEET 1 CHECK SYNTHESIZER LOOP FIGURE 6 4 SHEET 2 CHECK GENERATOR PHASE LOCK LO...

Page 23: ...e selector is in generator mode CHECK IC11 CIRCUIT CHECK SW2A B IC8CKT REINSTALL R111 CHECK R110 1 NO CHECK CR17 20 015 CKT APPROX 1V AT R110WIPER WITH AMPLITUDE CW REMOVE R111 APPROX 1V AT R110 WIPER...

Page 24: ...7 4 2 15V TO 10V SHIFT AT PINS 10 13 IC5 l YES 2 Vdc AT JUNCTION CR9 10 1 25 Vdc AT JUNCTION CR11 12 7 de ON C24 24 Vdc ONC23 DIAL POTENTIO METER BAD PROBLEM IN IC4 CIRCUIT PROBLEM IN IC5 CIRCUIT CHE...

Page 25: ...ECK SUM OF DIAL VCG IN SWEEP EXCEEDING OVERRANGE LIMIT 50 ILLEGAL OPERATION GCVCHECK TTL CHECK COAX E38 39 OK CHECK E33 34 WIRING R37 CHECK 011 CIRCUIT Figure 6 2 Generator Mode Checks Sheet 3 of 3 RE...

Page 26: ...REGULATOR IS ASSUMED TO BE DEFECTIVE 6 6 YES 15 Vdc REGULATOR IS ASSUMED TO BE IN CURRENT LIMIT MODE ISOLATE LOW Z BY LIFTING 15V JUMPERS 15 Vdc REGULATOR IS ASSUMED TO BE DEFECTIVE Figure 6 3 Power S...

Page 27: ...OP TIONAL TO DIGITA TIONAL TO DIGITAL 1 SHEET 2 SWITCH SETTINGS SWITCH SETTINGS fvEs NEGATIVE PULSES AT PIN 6 IC20 10k 200 kHz PROPOR nONAL TO DIGITAL SWITCH SETTINGS YES POSITIVE PULSES 10k 200 kHz A...

Page 28: ...RANGING SHEET 4 6 8 SYNTHESIZER LOOP CHECK CHECK POWER SUPPLY FIGURE 6 3 CHECK IC1 2 CIRCUIT YES CONTINUE TO SHEET 3 CHECK 01 2 XTAL CIRCUIT C1 ADJUSTMENT CHECK 08 9 CLK KILL CIRCUIT CHECK REFERENCE S...

Page 29: ...CIRCUIT CHECK IC23 24 CHECK IC23 24 REPLACE IC28 REPLACE IC32 NO CHECK IC11 12 CIRCUIT REPLACE IC29 CHECK IC13 VR1 CIRCUITS NOTE FREQUENCY F FOR FOLLOWING CHECKS SET DIGITAL SWITCH TO 1 9999 REPLACE...

Page 30: ...ET DIGITAL SWITCH TO 1 0000 6 10 FREQUENCY RANGING CHECK CHECK SYNTHESIZER l OOP SHEET 21 REPLACE IC14 REPLACE IC15 REPLACE IC16 CHECK GENERATOR PHASE LOCK LOOP SHEET 5 Figure 6 4 Synthesizer Mode Che...

Page 31: ...TY ATTPS ON SYNTH BO BA NO CHECK FREQUENCY RANGING SHEET4 NO CHECK COAX SET MODE SWITCH 1 TO SYNTH MODE CHECK SYNTHESIZER LOOP ISHEET21 COMPLETE STEPS 12 14 OF CALIBRATION PROCEDURE CHECK ICl 9 CIRCUI...

Page 32: ...OURCE X 100R GREATER RANGE SYNTH MODE 7 ILLEGAL OPERATION 1 MHz EXT REF SIGNAL 1 VRMS SINE SQUARE OR TTL 7 NO ILLEGAL OPERATION PROBLEM IN IC1 OR IF TTL BUFFER 11 OPTION INSTALLED ICJJ CHECK IC2 CHECK...

Page 33: ...vetek s product improvement program the latest electronic designs and circuits are incorporated into each Wavetek instrument as quickly as development and testing permit Because of the time needed to...

Page 34: ...fLOC K iur REF Pl IT LOt W SMER DElAIL B MS ROW R ST K UP FOR f iP OUtJD LUu T IP Pl AC E S k OlE N l COMUEC Ttooc TO BE M C _ JlC 9 llY SECURE TO LUf 5 PRIOR TO SOLOERlt J GROUtJD WIRES SEE DE TAIL S...

Page 35: ...GEtJfi wg BtJ AID EZ4 XIM E23 XIOOK c EZ2 XIOK c El SVVl OC iENT EZl XIK R A K J N E L E20 X lOOn E 3 X 10 n EIB C UC Kill E 4 1 ISV E42 15V E31 E l5 tSVCOM E 3 E2 SY E34 E2 r o NC EIS 1 J E FIN SYNT...

Page 36: ...ze b2 C OIGlN S107 00 0006 I l Pl EL REIR U10 1100 00 5753 WVIK IGOO OO S75J I 29 P R CORO 0 1789 ooe ca Pl QO b001 80 000 I l O INO ClfOR 1 G00 00 57b9 YTM I GOC CO i769 I c f ROM1I400 00 n7o I o Ll...

Page 37: ...E N I I IC I I EG2 1 I VIO Illw r RH al f I I II ISV REGU LA IOR EGULA TO_R_ ____ 4 I I Q 2 2 2N24 lo05A 1 134 I 100 1 zw 1 E f J Vl rv 4 ATTEN R135 I IN 100 lftw 1 l E O I Ill ST li EF OE SIG c Rf42...

Page 38: ...Rc oo1 I t ___ _j ______ 1 t frt _ _ JG8 Ct I R140 8 hCD i I I I I SINE I C Lc_l_ I t I TP s g LI I H18 z 1 u 1 0 Rs tr ii 1 1 1 I s I u _ u 9 e I t I I RMZ I v f2 I A LR l41 I I J 1 I I I tn Cl I I I...

Page 39: ...OT TR M 2K POT Sii lTCH 1Cl RES C l 21J 57 10 RES C 1 2W 5 3 9 RES C 2 J 57 43 RES C 112W r 1M RES l f 1 91 J l Z 100 RES 1 1F SW 17 IK RES HF l BW 1 lCK 5 C8814 01 16 0IP 1497 200091 201091 61182 2 T...

Page 40: ...11 WVTK 4789 00 0019 l 016 G17 TRANS KIPR 2N3903 182 503 102 WVTK 4998 00 0015 l QTY 2 4701 03 1002 QTY 2 4901 03 9030 R45 R46 R52 R53 RES SET 4 4 99K 1 BW 180 500 lOOA WVTll 789 00 0039 1 9 WAFER 147...

Page 41: ...TO l r i I r I I I LOAO I t I I I I I I Lr J I I ATTEN T SY IN 1 f _ __ 4 R c4 DETEl I I I 101 ND I tP r J f IK 100 I I f lp 4 xio tF 11 C17 1 27 01 4 0l K 12 2 100 RZ8 IK 1 29 2K 2 0ll t 20 1270 1 32...

Page 42: ...CS8 _ i J I m 1 c 8 E 9 J3 i I E3 fNT Qf F En El I f I 11 I iY 1 R lS 11 I I 11111 CR4 1 l R18 c J E4 DI G llflLr 1 tDIC31 I i 88 d i I QUTPuT A TTEMIJATe I 9 c I Ile C l b RE 0 I I I 1 11 11 R I R Z4...

Page 43: ...111 OK RES HF 1 BW 1 I0 RES IF I SW IX 13K RES HF 1 BW 1X 1 SK 91AR2K RC20GF 221 RNSSO IOOOF RNS50 1001F RN55D 1002F RN550 lOROF RN55D 1302F RN550 I501F RES HF 1 8W 1 IS 2K RN550 1822F RES HF I SW IX...