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Operating and service manual

1. AG RF DETECTOR 334 ONLY 00332 66503 S3AR S2C7 i O P O Coo SIAR S2C8 W O i Io LYOLTMETER 390PF e ooo BET Lever i lo O 38 e DISTORTION O Q I RI Bi i 0 i O s7 2951 u SNC EE O I 7 NICZYM 290 KHz sane S 999K S3CI 0 7 3PF o 1900 3300PF 2000PF Y EW 334 ONLY o ce v S3RI4 i i o o 300 far 1 Ci LI L2 o 2000Pf a 3MH 3 3MH ZA J5 X ce c3 2000PF 1500PF COPYRIGHT 1965 BY HEWLETT PACKARD COMPANY FUNCTION Qs SIBR I 2 P A2 weeDance CONVERTER 00333 665 12 AMPLIFIER 02 IMPEDANCE CONVERTER Ri Qi 300 i GC 12PF R3 i 3 2 SEE NOTE I A B c SIBF F RFR FR VIEWED FROM KNOB END VIEWED FROM KNOB END S3CF A B C D E REFERENCE F RF RF RF REFER f 3 A ly 2 3 LA TI 5 6 D VIEWED FROM KNOB EN 22 5VDC 22 7V0C H 5vbpC Y 1 Figure 7 2 Impedance Converter P O A2 and RF Detector A4 1 5 BACKDATING INFORMATION NOTE 1 A2R3 R20 R39 are different in some earlier instruments and are not directly interchangeable with the ones listed in Table 6 1 See Appendix C Change 11 for applicable numbers 1 6 NOTE 2 The A2 Component locator for earlier instruments is shown below It applies to the following instruments and serial numbers 333A 1101A02085 and below 334A 1106A03240 and below Also applies to Option 01 Note 3 T
2. DSM C fxd Al elect 50 uF 100 10 6 vdew 30D506G006CB2 Delete on Option 01 instrument DSM C fxd Al elect 50 LF 7595 10 25 vdew 30D506G025CC2 DSM C fxd mica 200 pF 5 150D226X9015B2 DYS C fxd Ta elect 22 uF 10 15 vdew Diode Si 20 mA 1V 10 na at 10V 50 wiv obd 2 pF 2 ns Not assigned Diode hot carrier Diode breakdown 14 0V 5 75 pF FZ 1403 TSTR Si P channel FET TSTR Si PNP 360 mW 700 MHz TSTR 0 36 W 350 MHz 15 V TSTR Si PNP TSTR Si NPN 2N4250 MPS6513 5 SM4713 TSTR Si PNP TSTR Si NPN TSTR Si PNP SM4713 CB3015 fxd comp 3002 5 1 4 W CB 9135 R R fxd comp 91 kN 5 1 4 W R var lin trim 50 kN 10 1 2 W R R CB3635 fxd comp 36 kN 25 1 4 W CB5145 fxd comp 510 kQ 5 1 4 W gt Option 01 only 6 7 Section VI REFERENCE hp TQ DESIGNATOR PART NO 2 0683 1025 0683 3025 0683 1025 0683 7515 0683 1535 0683 4335 0683 6215 0683 6815 0683 1515 0683 4715 0683 4705 0683 6215 0683 2405 0683 2015 2100 1738 0683 3025 0683 5115 0683 5105 0683 6825 0683 2015 0683 2025 0683 1235 0683 2405 0698 3174 0683 3015 0698 3147 0757 1102 0757 0348 2100 0206 0757 0346 0683 3945 0683 3025 0883 1015 2100 1788 0757 0390 0683 1815 A
3. oo oo o Erie Pa C W Marwedel San Francisco Cal General Instrument Corp Micamoid Division Newark N J James Millen Mfg Co Inc Malden Mass J W Miller Co Los Angeles Cal Cinch Monadnock Div of United Carr Fastener Corp San Leandro Cal Mueller Electric C0 Cleveland Ohio National Union Newark N J Oak Manufacturine Co Crystal Lake NI The Bendix Corp Electrodynamics Div N Hollywood Cal Pacific Metals Co San Francisco Cal Phaostran Instrument and Electronic Co So Pasadena Cal Philadelphia Steel and Wire Corp vuv Philadelphia Pa American Machine amp Foundry Co Potter amp Brumfield Div Princeton Ind TRW Electronic Components Div Camden N J General Instrument Corp Rectifier Division Brooklyn N Y Resistance Products Co Harrisburg Pa Rubbercraft Corp of Calif Torrance Cal Shakeproof Division of Mlinois Tool Works Elgin 11 Siem So Braintree Mass Signal Indicator Corp New York N Y Struthers Dunn Ine Pitman N J Code No 18452 78471 78488 18493 78553 78790 18947 79136 19142 19251 79127 19963 80031 80033 80120 80131 80207 30223 80248 80294 80411 80436 80509 80583 80640 80813 81030 81073 81095 81312 81349 81483 81541 81860 82042 82047 82116 82142 82170
4. 5 16 Operation 4 1 1 8 Distortion Measurement in AM VI REPLACEABLE PARTS ed CarrierS oooooo oo 4 1 6 1 Introduction 6 1 4 10 Voltmeter Operation se Gel 6 4 Ordering Information 6 1 4 12 Detailed Circuit Description 4 1 6 6 Non Listed Parts 6 1 4 13 Impedance Converter Circuit 4 1 4 17 Rejection Amplifier Circuit 4 2 Section Page 4 39 High Pass Filter i wave won AO VH CIRCUIT DIAGRAMS 7 1 4 41 Meter Amplifier 4 5 7 1 Introduction ere gee uml 4 49 Power Supply Circuit 4 7 4 54 RF Detector Circuit 334A only 4 7 Appendix A CODE LIST OF MANUFACTURERS Section Page V MAINTENANCE 5 1 B SALES AND SERVICE OFFICES 5 1 Introduction 5 1 5 3 Required Test Equipment 5 1 C MANUAL BACKDATING CHANGES iii Table of Contents Model 3334 334A LIST OF TABLES Number Page Number Page 1 1 Specifications HESTENE do 5 5 Power Supply and Bias Adjustments 5 8 3 1 Effect of Harmonics on Voltage 9 6 Sensitivity Switch Calibration 5 12 Measurements s a s e 3 1 5 7 Factory Selected Components 5 12 5 1 Required Test Equipment 5 0 5 2 Second Harmonic Accuracy Check 5 2 5 8 Troubleshooting Aid 5 13 5 3 Frequency Calibration Accuracy Check 9 4 5 9 Photoresistor Check e 5 15 5 4 Voltmeter Frequency
5. Harrison N J 86928 Seastrom Mfg Co Glendale Cal 87034 Marco Industries Anaheim Cal 87216 Philco Corporation Lansdale Division Te A RIO eet PR Lansdale Pa 87473 Western Fibrous Glass Products Co San Francisco Cal 87664 Van Waters Rogers Inc San Francisco Cal 87930 Tower Mfg Corp Providence R I 88140 Cutler Hammer inc Lincoln IH 88220 Gould National Batteries Inc S Paul Minn 88698 General Mills Inc Buffalo N Y 89231 Graybar Electric Co Oakland Cal 89473 GE Distributing Corp Schenectady N Y 89479 Security Co Detroit Mich 89685 United Transformer Co Chicago Ill 90030 United Shoe Machinery Corp Beverly Mass 90179 U S Rubber Co Consumer Ind E Plastics Prod Div Passaic N J 90365 Belleville Speciality Tool Mfg Inc D s b a 49 Belleville DI 90763 United Carr Fastener Corp Chicago Il 90970 Bearing ona de Co San Francisco Cal 91146 ITT Cannon Elect Salem Div EE N ace Salem Mass 91260 Connor Spring ME Co A San Francisco Cal 91345 Miller Dial amp Namepiate Co El Monte Cal 91418 Radio Materials Co Chicago DL 91506 Augat Inc NEE Attleboro Mass 91637 Dale Electronics Ine KS Columbus Nebr 91662 Elco Corp Willow Grove Pa 91673 Epiphone Inc New York N Y 9
6. Third harmonic predominant Balance incorrect meter reading of scale j ut Frequency incorrect meter readin off scale Model 333A 334A Section IV ureigetq pog p IND A 9210 5 votC vttt J3AIug STT es dNY I 1 I I I I I I I 39V110A es X 130 dg Te 3SVHd ong IN zr LUISY 94022v 83141 TdWY 602v SDZV 390188 indino LINIMI YILIN 43M IYVES 1865 A 9v1 YIlH pg IVA 3SVHd 06 HOLVNNILIV MIV80334 i 1SOd 1 A H3i 4114 Y NOLLOIPIN Sues U3INH3A ALIAILISN3S 4 9H2S 182S HOLVNNILLV WHO DZWI SANO vrec NOI LUOLSIO a J3A31 13S 130 AN L LJ o 3 if YILIN LIOA IS O d H nuon c em p BO emm w emm mm mz 4 I I I i i i j I i EINES ZIYES POW IOZY UOLYNNALLV O O O O YJLNJANOD a O IS O d IS O d JONVOIdN I IS O d p cA ar w em em cub sa WEB Aue A ep en e er en wn mb Boe A ep AD ep spe ee m 5 CD b CD a 1 sO CEN 4 0 Model 333A 334A Section IV SECTION IV THEORY OF OPERATION 4 1 OVERALL DESCRIPTION 4 2 Models 333A and 334A Distortion Analyzers in clude an impedance converter a rejection amplifier a metering circuit and a power supply The Model 334A also contains an AM detector The impedance converter provides a low noise input circuit with a high in
7. fxd comp 33000 45 1 4 W CB 3325 CB 1035 fxd comp 10 kQ 5 1 4 W m CB 3035 fxd comp 30 kN 5 1 4 W CB 6835 fxd comp 68 kN 5 1 4 W z Assembly bridge balance board includes DS1 and DS2 VI thru V5 Lamp incd 10 V 14 mA 1869 D CL905HL Cell photoconductive CdS Cell photoconductive CdS CL905HN Assembly filter board includes C1 and C2 LI 148P Yellow jacket 148P47491 C fxd my 1 3 LF 10 50 vdew C fxd my 0 47 LF 10 100 vdew Inductor 180 mH 2 7 pin miniature socket base 1 C fxd my 0 33 uF 10 400 vdew 663UW obd 2 C fxd my 1 pF 10 400 vdew 663F obd 1 C var cer 5 20 pF 503000B2PO28R 1 C var air 12 5 to 535 1 pF 4 sect 2 c fxd cer 005 uF 20 250 vac THD 8 502M 1 4KV 1 C fxd mica 39 pF 10 RCM15E390K 1 C fxd cer 005 LF 20 250 vac THD 8 502M 1 4KV C fxd mica 270 pF 5 500 vdcw RDM15F271J5C C Type GA obd FD 2387 fxd TiOg 2 2 pF 10 500 vdcw Diode Si 100 mA 100 wiv 12 pF Option 01 only Light indicator 599 125 clear Fuse 0 15 amp 250 V slow blow 115V Op Fuse 0 062 amp 250 V slow blow 230V Op Fuse 1 8 amp 250V slow blow MDL 15 100 MDL 1 16 MDL 1 8 See Figure 6 1 Connector ac power cord receptacle EAC 301 obd SA 2500 I Inductor fxd 2 5 mH 10 309 56 590 652A1 38 Bead s
8. Downey Cal Precision Connector Corp Jamaica N Y Duncan Electronics Inc Costa Mesa Cal General Instrument Corp Semiconductor Division Products SEE O ets Newark N J Imperial Electronic Inc pen Buena Park Melabs Inc sees Palo Alto i Philadelphia Handle Co Camden N J Grove Mfg Co Inc Shady Grove Pa Gulton Ind Inc ES System Div Albuquerque N M Clarostat Mig Co Dover N H Elmar Filter Corp w Haven Cona Nippon Electric Co Ltd Tokyo Japan Metex Electronics Corp Clark N J Deita Semiconductor Inc Dickson Electronics Corp Airco Supply Co Inc Witchita Kansas Wilco Products Detroit Mich Thermolloy Dallas Texas Solitron Devices Inc Tappan N Y Telefunken GmbH Hanover Germany Midland Wright Div of Pacific Industries Inc Sem Tech Newbury Park Cal Calif Resistor Corp S American Components Inc Conshohocken Pa ITT Semiconductor a Div of Int Telephone and Telegraph Corporation West Palm Beach Fla Hewlett Packard Company Loveiand Colo Corneli Dublier Electric Corp Newark N J Corning Giass Works Corning N Y Electro Cube Ine San Gabriel Cal Williama Mfg Co San Jose Cal The Sphere Co Inc Little Falls N J Webster E
9. REJECTION AMPLIFIER Set 333A 334A controls as follows FUNCTION e VOLTMETER MODE e L4 e o e e e d e e o MANUAL METER RANGE 3 VOLTS SENSITIVITY e e e a s e 0 4 e s MAX SENSITIVITY VERNIER MAX FREQUENCY RANGE XIK Frequency Dial 5 Connect a 1 kHz signal to 333A 334A INPUT and adjust amplitude for 0dB indication 333A 334A meter Set 333A 334A FUNCTION to SET LEVEL Model 333A 334A 333A 334A meter should indicate between 40 5 dB and 0 8 dB verifying gain in re jection amplifier If sufficient gain is present check Wien bridge circuit H sufficient gain is not present proceed with the following steps c Set amplitude of 1 kHz input signal to 3y rms Measure ac signal at A3 pin 7 for approximately 185 mV rms use a 10 MQ 10 pP impedance probe This voltage will increase to approximately 2 4 V in distortion mode at null If proper voltage is present proceed to step d if not go to step f d Measure ac output of rejection amplifier at A3 pin 2 for approximately 0 32 V rms It proper voltage is present check high pass filter and switch and check function and meter range switch connections If proper voltage is not present go to step e e Measure ac signal at A3 pin 8 for approxi mately 315 mV rms use a 10 M9 10 pF probe and be sure that Wien bridge is detuned with 1 kHz input and 333A 334A frequency at 5 kHz If proper voltage is
10. Repeat step e until best null is indicated on 333A 334A Reduce METER RANGE setting as necessary to maintain on scale meter indication Electronic counter should indicate period of 100 msec 5 msec 10 Hz 5 Set electronic counter to read frequency Repeat Steps b through f for each frequency listed in Table 5 4 At each respective frequency setting electonic counter should indicate that test oscillator frequency is within tolerances listed in table ELECTRONIC COUNTER hp 5532A e TEST OSCILLATOR hp 652A oes 333A 8 14 7 alla ADAPTER BNC T hp Part No 1250 0072 1 PH br 6000 FEED THRU TERMINATION hp 110954 Figure 5 4 5 4 DISTORTION ANALYZER hp 333A 334A Frequency Calibration Accuracy Check Model 333A 334A Table 5 4 333A 334A FREQUENCY Frequency Calibration Accuracy Check ELECTRONIC COUNTER INDICATION TEST OSCILLATOR FREQUENCY 950 Hz to 1050 Hz 95 kHz to 105 kHz 190 kHz to 210 kHz 360 kHz to 440 kHz 540 kHz to 660 kHz 5 14 AUTOMATIC NULLING MODE CHECK ae e Connect 5082 output of test oscillator term inated in 509 load to 333A 334A INPUT terminal Set 333A 334A controls as follows FUNCTION SET LEVEL METER RANGE SET LEVEL MODE MANUAL FREQUENCY RANGE XI Frequency Dial 29 Set test oscillator frequency to 25 Hz at an amplitude of 1 V Adjust SENSITIVITY controls for 2 dB
11. 1855 0082 1853 0203 1854 0354 1853 0086 1854 0297 A2Q1 A2Q2 A2Q3 A2Q4 A2Q5 A2Q6 A2Q7 A2Q8 A2Q9 1853 0010 1854 0019 1853 0010 0683 3015 0683 9135 2100 2031 0683 3635 0683 5145 A2R1 See Appendix C for backdating information 150D185X9035B2 DYS 30D506G006CB2 SM tx Ta elect 1 8 uF 10 35 vdew fxd Al elect 50 uF 100 10 6 vdew D fxd Al elect 200 uF 75 10 3 vdew 30D207F003CC2 DSM RDM15C220J5C 30D106G015BA2 DSM fxd mica 22 pF 5 fxd Al elect 10 uF 75 10 15 vdcw 557 610 34E RDM15E390J3C RDM15F241J3C var cer 8 50 pF fxd mica 39 pF 5 fxd mica 240 pF 5 5C50B1 CML fxdcer 0 1 uF 80 20 50 vdew 30D107G015DC2 fxd Al elect 130 uF 75 10 15 vdew C fxd mica 82 pF 5 RDM15E820J3C C fxd Al elect 200 uF 75 10 15 vdew 30D207G0150F4 DSM C fxd mica 390 pF 45 RDM15F391J3C C fxd elect 0 22 uF 80 20 25 vdcw 5C9B CML C fxd my 0 01 uF 10 200 vdew 192P10392 PTS C fxd Al elect 500 uF 75 10 15 vdew 34D507G015FJ4 DSB C fxd Al elect 1300 uF 75 10 2 5 vdew 34D138G2R5FJ4 DSB C fxd cer 1000 pF 20 250 vdcw 19C251A C fxd mica 160 pF 20 RDM15F161G3C C fxd Al elect 100 uF 75 10 15 vdew 30D107G015DC2 DSM C fxd mica 390 pF 5 RDM15F391J3C C fxd elect 0 47 uF 80 20 25 vdew SC 1137 CML C C C C C
12. 4 18 The rejection amplifier circuit consists of the preamplifier A3Q1 thru A3Q3 the Wien bridge resistive leg and auto control loop A5Q1 thru A5Q9 with associated lamp and photocell the reactive leg and auto control loop A5Q10 thru A5Q18 with associ ated lamp and photocell and the bridge amplifier A3Q4 thru A3Q6 4 19 PREAMPLIFIER CIRCUIT 4 20 The signal from the impedance converter is applied to the preamplifier which is used during SET LEVEL and DISTORTION measuring operations Negative feedback from the junction of A3R10 and A3R11 is applied to the junction of A3R2 and A3C2 to establish the operating point for A3Q1 Negative feedback from the emitter of A3Q3 is applied to the emitter of A3Q1 to stabilize the preamplifier The preamplifier like the impedance converter is designed for high open loop gain and low closed loop gain to minimize instrument induced distortion 4 21 WIEN BRIDGE CIRCUIT 4 22 Inthe distortion measuring operationthe Wien bridge circuit is used as a rejection filter for the fundamental frequency of the input signal With the FUNCTION selector S1 inthe DISTORTION position the Wien bridre is connected as an interstage coupling network between the preamplifier circuit and the bridge amplifier circuit The bridge is tuned to the fundamental frequency of the input signal by setting the FREQUENCY RANGE selector S4 for the appli cable frequency range andtuning the capacitors C4A through C4D
13. Round Red vernier Disc Assembly Vernier drive Plate Frequency Dial Hub Dial Insulator Binding Post Bracket Mounting Shield RF Det Cover Plate P O Figure 6 1 Mechanical Parts Section VI Model 333A 334A 5060 8587 Top Cover Assembly Full Module 00333 00206 334 Panel Rear 5060 0731 Frame Assembly 5 x 11 Full Module 5060 8737 Retainer Half Module 5000 8597 Side Cover Rear 5 x 11 Full Module 5000 8599 Side Cover Front 5 x 11 Full Module 5060 0222 Handle Assembly Side Beauty Strip Stand Tilt Foot Assembly Full Module Bottom Cover Assembly Full Module 5000 0051 1490 0030 5060 0767 5060 8711 00334 00205 334 00333 00206 333 5060 8740 Panel Front ki wee xr OI b CDI IO N PO II DD r k pa Kit Rack Mount Half Module eeeceoeoeo doo Figure 6 2 Modular Cabinet Parts Model 333A 334A 3334 3344 8 4368 0370 0160 3030 0001 2370 0016 61B 40D 4 5040 0669 00333 04001 5020 0630 3030 0004 2390 0009 2190 0010 5040 5158 2530 0003 0510 0005 ve NR C IN ta INDEX hp PART NO Section VI ON INDEX hp PART NO DESCRIPTION DESCRIPTI Set screw Screw Plate frequency dial Disc assembly vernier drive Dial FREQUENCY Dial hub Set screw Screw Lock washer Indicator Screw Clip retaining 5020 0639 00333 63601 9020 0327 9040 0631 3030 00
14. Turn instrument on and mechanically zero meter accordingto procedure in Paragraphs 3 15 and 3 16 Set NORM R F DET switch to NORM Set FUNCTION switch to VOLTMETER Set METER RANGE switch to a range exceeding amplitude of signal to be mea sured Connect signal to be measured to INPUT terminals Set METER RANGE switch to give a reading as close to full scale as possible and ob serve meter indication The dB scale of the 333A 334A is calibrated in dBm such that 0 dBm 1 milliwatt dissi pated by 600 ohms Therefore a dBm mea surement must be made across 600 ohms However dB measurements across other impedances can be converted to dBm by use of the Impedance Correction Graph of Fig ure 3 3 For example to convert a 30 dB reading across 200 ohms to dBm locate the 200 ohm impedance line at the bottom of the graph Follow the impedance line to the heavy black line and read the meter correc tion at that point The correction for 200 ohms is 5 dBm thus the corrected reading is 25 dBm 3 3 Section DI 3 23 METER INDICATION 3 24 The 333A 334A meter is calibrated to indicate in both dB and volts It is interesting to note that the METER RANGE markings differ from most ac volt meter range markings On most ac voltmeters 600 ohms 0 dB corresponds to the 1 volt range This is not true inthe case of the 333A 334A Since the instru ment is primarily a distortion analyzer measurements are in dB relati
15. 1 4 W CB 2015 A5R15 0683 1035 R fxd comp 10 kN 5 1 4 W CB 1035 A5R16 0683 2235 R fxd comp 22 kQ 5 1 4 W CB 2235 A5R17 0683 1035 fxd comp 10 kN 595 1 4 W CB 1035 A5R18 0683 2025 fxd comp 20000 5 1 4 W CB 2025 A5R19 0883 3635 fxd comp 36 kN 5 1 4 W CB3635 A5R20 0683 1615 fxd comp 1600 5 1 4 W CB 1615 A5R21 0683 3615 fxd comp 3602 5 1 4 W CB 3615 A5R22 0757 0437 fxd met fim 4 75kN 1 1 8 W CEC T O obd A5R23 0683 1045 fxd comp 100 kO 5 1 4 W CB 1045 A5R24 A5R25 A5R26 thru CB 1035 CB 5125 CB 1035 fxd comp 10 kN 5 1 4 W fxd comp 51000 5 1 4 W fxd comp 10 kQ 25 1 4 W 0683 1035 0683 5125 0683 1035 A5R30 A5R31 0683 1845 fxd comp 180 kN 5 1 4 W CB 1845 A5R32 0683 3035 fxd comp 30 KQ 595 1 4 W CB 3035 CB 6835 A5R33 0683 6835 fxd comp 68 kQ 5 1 4 W PILI IN AAD PIPA mg A5R34 A5R35 0683 1005 fxd comp 100 5 1 4 W CB 1005 A5R36 A5R37 0683 1035 fxd comp 10 kN 5 1 4 W CB 1035 A5R38 A5R39 0683 1015 fxd comp 1008 5 1 4 W CB 1015 A5R40 thru 0683 1235 fxd comp 12 kQ 5 1 4 W CB 1235 A5R42 A5R43 A5R44 0683 1035 R fxd comp 10 kQ 5 1 4 W CB 1035 A5R45 0683 7545 R fxd comp 750 kQ 5 1 4 W CB 7545 A5R46 0683 1005 R fxd comp 109 5 1 4 W CB 1005 A5R47 0883 2015 R fxd comp 2009 5 1 4 W CB 2015 A5R48 0683 1035 R fxd comp 10 kQ 5 1 4 W CB
16. 82209 82219 82376 82389 82647 82768 82866 82877 82893 83058 83086 83125 83148 83186 83298 83315 83324 83330 83332 83385 83501 83594 83740 83777 83821 83942 84171 84396 84411 Manufacturer Address Thompson Bremer amp Co Chicago DL Tilley Mfg Co San Francisco Cal Stackpole Carbon Co St Marys Pa Standard Thomson Corp Waitham Mass Tinnerman Products Inc Cleveland Ohio Transformer Engineers San Gabriel Cal Ucinite Co Newtonville Mass Waldes Kohinoor Inc Long Island City N Y Veeder Root Inc Hartford Conn Wenco Mfg Co Chicago NI Continental Wirt Electronics Corp Scy alea d aos DA Philadelphia Pa Zierick Mfg Corp New Rochelle N Y Mepco Division of Sessions Clock Co DRE wit nw V f A Morristown N J Prestole Corp Toledo Ohio Schnitzer Alloy Products Co Elizabeth N J Electronic Industries Association Standard tube or semi conductor device any manufacturer Unimax Switch Div Maxon Electronics Corp da r wos w Wallingford Conn United Transformer Corp New York N Y Oxford Electric Corp Chicago Ill Bourns Inc S Riverside Cal Arco Div of Robertshaw Controis Co Columbus Ohio All Star Products Inc Defiance Ohio Avery Label Co Monrovia Cal Hammarlund Co Inc Mars Hill N C Stevens Arnol
17. A5C31 0160 0161 C fxd my 0 01 uF 10 200 vdew 192P10392 PTS D2361 1910 0016 Diode Ge 60 wiv I ms ASCRI ASCR2 ASCR3 1901 0025 Diode Si 100 wiv 12 pF 100 mA D3072 ASCR4 1910 0016 Diode Ge 60 wiv 1 ms D2361 ASCRS ASCR6 1901 0025 Diode Si 100 wiv 12 pF 100 mA D3072 1854 0033 TSTR Si NPN 2N3391 2N3391 A5Q1 thru 2N1304 2N3391 Ge NPN 2N1304 Si NPN 2N3391 TSTR TSTR 1851 0017 1854 0033 obd 2N3391 TSTR Si NPN 2N708 TSTR Si NPN 2N3391 1854 0005 1854 0033 A5Q10 A5Q11 2N1304 2N3391 TSTR Ge NPN 2N1304 TSTR Si NPN 2N3391 1851 0017 1854 0033 A5Q12 A5Q13 thru A5Q16 A5Q17 A5Q18 Si NPN 2N708 obd 1854 0005 TSTR A5R1 0683 2235 R fxd comp 22 KQ 45 1 4 W CB 2235 A5R2 0683 1035 R fxd comp 10 kQ 5 1 4 W CB 1035 A5R3 0683 2735 R fxd comp 27 kO 5 1 4 W CB 2735 A5R4 0683 1035 R fxd comp 10 kN 5 1 4 W CB 1035 A5R5 A5R6 0683 1235 R fxd comp 12 KQ 5 1 4 W CB 1235 A5R7 A5R8 0683 1015 R fxd comp 1000 5 1 4 W CB 1015 A5R9 0683 1235 R fxd comp 12 kQ 5 1 4 W CB 1235 A5R10 A5R11 0683 1035 R fxd comp 10 kQ 595 1 4 W CB 1035 A5R12 0683 7545 R fxd comp 750 kQ 5 1 4 W CB 7545 A5R13 0683 0515 R fxd comp 5 10 5 1 4 W 51G5 A5R14 0683 2015 R fxd comp 2000 5
18. Delete A2C30 from circuit Change value of A2R28 to 10 ohms Change value of A2C20 to 0 22 uF Figure 7 5 Delete A3C31 from circuit Table 6 1 Delete A5C31 Figure 7 2 Delete A2R18 from circuit Replace with Diode A2CR5 Figure 7 4 Delete A2R19 from circuit Table 6 1 Delete A2R18 and A2R19 Add A2CR5 1901 0025 Diode Si 50 mA 1 V 100 piv 12 pF Change A2Q1 to 1855 0082 Change A2C19 to 680 pF Part 0140 0208 This capacitor should not be replaced with the value listed in Table 6 1 unless a frequency response problem is encountered at 1 MHz S3C4 was 22 pF and should not be replaced unless a frequency response problem is encountered at 3 MHz on the 1 V and 1 mV ranges Change the location of R9 as indicated in the following illustration d S c eer Re Model 333A 334A CHANGE 7 CHANGE 8 CHANGE 9 CHANGE 10 CHANGE 11 CHANGE 12 CHANGE 13 CHANGE 14 Appendix C Manual Backdating Changes Model 333A 334A Page 3 A2C29 was 390 pF in some earlier instruments Do not change A2C29 to the value shown in Table 6 1 unless a frequency response problem is encountered on the 300 LV range Change A3R3 to 12 kN If A3Q1 is changed it may be necessary to change the value of A3R3 to compensate for transistor gain Delete R12 and add A1R1 connected between pins 10 and 11 on Al AIRI is 33 kQ part 0687 3331 Table 6 1 Change the part of Cable W1 to 8120 0078 Change the part o
19. Laboratories Inc Burlington Wis 00853 Sangamo Electric Co Pickens Div eee me 55 Pickens S C 00866 Goe Co City of Industry 00891 Carl E Holmes Corp Los Angeles Cal 00929 Microlab Inc di Livingston N J 01002 General Electric Co C tor Dept Hudson Falls N Y 01009 Alden Products Co Brockton Mass 01121 Allen Bradley Co Milwaukee Wis 01255 Litton Industries Inc Beverly Hills Cal 01281 TRW Semiconductors Inc Lawndale Cal 01295 Texas Instruments Inc Transistor Products Div Dallas Texas 01349 The Alliance Mfg Co Alliance Ohio 01538 Small Parts Inc Los Angeles Cal 01589 Pacific Relays Inc Van Nuys Cal 01670 od Bros Silk Co New York N Y 01930 Amerock Corp Rockford Ill 01960 Pulse Engineering Co Santa Clara Cal 02114 Ferroxcube Corp of America Saugerties N Y 02116 Wheelock Signals Ine Long Branch N J 02286 Cole Rubber and Plastica Inc Sunnyvale Cal 02660 Amphenol Borg Electronics Cordio Broadview Il 02735 Radio Corp of America Semi conductor and Materials Division Somerville N J 02771 Vocaline Co of America Ine Old Saybrook Conn 02777 Hopkins EngineeringCo San Fernando Cal 02875 Hudson Tool amp Die ERA Newark N J 03296 Nylon Molding Corp Springfieid N J 03508 G E Semiconductor Prod Dept
20. The bridge circuit is balanced by ad justing the COARSE balance control R4 andthe FINE balance control R5 In the AUTOMATIC MODE fine tuning and balancing are accomplished by photoelectric cells which are in the resistive and reactive legs of the Wien bridge The error signals for driving the photocells are derived by detecting the bridge output using the input signal as a reference 4 23 When the Wien bridge is not tuned exactly to the frequency to be nulled a portion of the fundamental 4 2 Model 333A 334 INPUT TO BRIDGE A OUTPUT OF BRIOGE IF RESISTIVE LEG B IS UNBALANCED OUTPUT OF BRIDGE IF REACTIVE LEG C IS DETUNED 333A B 1464 Figure 4 2 Bridge Waveforms frequency will appear at the bridge output The phase of this signal depends on which leg of the bridge is nc tuned or on the relative errors in tuning if neither i set correctly The magnitude of the signal is propor tional to the magnitude of the tuning error of either o both legs of the bridge 4 24 Figure 4 2a shows a sinusoid input tothe Wien bridge If the resistive leg of the bridge is slightly unbalanced the output of the bridge is very small but has the waveform shown in Figure 4 2b and is in phase with the input As the resistive leg is tuned the signal approaches zero amplitude at null and then becomes larger but 180 out of phase if the null position is passed Whenthe resistive leg is correctly tuned and the reactive leg is tuned thr
21. 0dB SET LEVEL position thus making the next range 30 or 10 dB etc Set FREQUENCY RANGE switch andfrequency dial to fundamental frequency of input signal Set FUNCTION switch to DISTORTION Adjust frequency dial vernier and BALANCE COARSE and FINE controls for minimum Model 333A 334A 0 p meter indication Set METER RANGE switch down scale as necessary to keep meter in dication on scale Repeat step m until no further reduction in meter indication can be obtained Observe distortion either in percentage or dB as indicated by meter deflection and METER RANGE switch setting Forexample if meter indicates 0 4 and METER RANGE setting is 1 distortion measured is 0 4 of fundamental Similarly if meter indi cates 6 dB and METER RANGE setting is 40 dB distortion measured is 46 dB from fundamental NOTE In MANUAL mode the accuracy of distortion measurements is affected by frequency stability of the input signal An inaccuracy in distortion indications occurs when the frequency drift of the input signal exceeds the bandwidth of the rejection curve If desired rms voltage of input signal can be measured by setting FUNCTION switch to VOLTMETER and setting METER RANGE Switch to obtain an on scale indication a C e Perform steps athroughlof Paragraph 3 19 Adjust frequency dial vernier and BALANCE COARSE and FINE controls for minimum meter indication When meter indication is le
22. 1035 A5R49 0683 2235 R fxd comp 22 kQ 5 1 4 W CB 2235 A5R50 0683 1035 R fxd comp 10 KO 5 1 4 W CB 1035 A5R51 0683 2025 R fxd comp 20000 5 1 4 W CB 2025 Section VI Model 333A 334A Table 6 1 Replaceable Parts Cont d REFERENCE hp DESIGNATOR PART NO ra DESCRIPTION MER MFR PART NO A5R52 0683 3635 A5R53 0683 1615 ASR54 0683 3615 A5R55 0698 4470 A5R56 0757 0446 ASRST 0683 2225 A5R58 0683 1035 A5R59 0683 1215 A5R60 0683 1035 A5R61 thru 0683 3325 A5R64 0683 1035 A5R65 thru ASR69 ASRTO 0683 3035 A5R71 0683 6835 A6 00333 66506 A6DS1 A6DS2 2140 0053 1990 0043 A6V1 thru A6V3 A6V4 A6V5 1990 0044 AT 00333 66507 0160 2115 0170 0064 9100 1317 0160 0953 0160 3327 0130 0006 0121 0004 0160 3333 0140 0021 0160 3333 0140 0206 0150 0015 1901 0025 1450 0049 2110 0320 2110 0311 2110 0318 1251 2357 9140 0041 170 08 9100 3447 1120 0398 6 12 R fxd comp 36 kN 5 1 4 W CB 3635 R fxd comp 1609 595 1 4 W CB 1615 R fxd comp 3800 5 1 4 W CB 3615 R fxd met fim 6 98 59 1 1 8 W CEA T O obd R fxd comp 15 KQ 1 1 8 W CEA T O obd R fxd comp 22000 5 1 4 W CB 2225 R fxd comp 10 kM 5 1 4 W CB 1035 R fxd comp 1200 5 1 4 W CB 1215 R fxd comp 10 kN 5 1 4 W CB 1035 R
23. 4 ei lt a awe 25vDC 4 EC R36 3 P O UO 47 1 0 VOLTMETER 25v0c lt I I Z E NOTE 1 i ce R3 PE B R8 BETTEVEL d OK 6800 BIAS mm EMITTER 03 R4 DISTORTION 10K gt 4 9 1 cw PREAMPLIFIER o 02 Q3 CI RI 100 240 sof Ca 1 10 6VDC 4 TAS R35 SENSITIVITY VERNIER R9 FEEDBACK 2740 c5 eg FEEOBACK DUMMY SHIELD cz AS RI 200 600 20K A B C D C3 FIR F R FRFRF R 39 54 25V A Los 500 S4BF S4DR REFERENCE REFERENCE Y Y 12 i 13 R32 2 13K 10 3 R27 RIA 9 4 A 200 2 74K 5 RI3 R3I IU 7 15K 33K VIEWED FROM VIEWED FROM KNOB END REAR A in FEEOBACK COPYRIGHT 1965 BY HEWLETT PACKARD COMPANY 3334 3344 E 03304 FREQUENCY RANGE a Oss n 4 E GE 153 pop d 5406 PONG WE S4DR S4CF 2 2PF E 00333 75 85 7 8 66506 Dog x b ot S4R2I SAR gt i Na I NO i LOM 288M LX a E 75 o E o S4R25 S4R3 MES 130K 2 61M 0 Jo f T i o O E O o e S4R6 S4R5 i i K i T l 53 6K 255K KA O d 105 ol Cap 3 1 S4R8 S4R7 is to i 12 S BAL ES Hai 1 I I I S4RIO S4R9 C3 3 1 i 1 40K 1 65K GK 2 5 20PF Tn 3 3 O M EM Low t 1 t P O P O I I 1S4DR S4CF l 15 25 1 2 E O O O O 5 os S4RI2 s4R22 S4Rii a W 13M 1 OM 28e8M 2 ES L P i o gt S4R26 S4RI3 i I30K 2 67M 3 1 4 s O 5
24. 50 uF Set 333A 334A METER RANGE switch to 1 VOLT Disconnect test oscillator and connect volt meter calibrator to 333A 334A as shown in Figure 5 6 Set voltmeter calibrator to 0 9 V rms at 400 Hz Note 333A 334A meter reading Disconnect voltmeter calibrator and connect test oscillator to 333A 334A Set test oscillator frequency to 400 Hz and adjust amplitude so that 333A 334A meter reading is same as in step h Set a refer ence on meter of test oscillator and use amplitude control to maintain set reference whenever frequency of oscillator is varied n O p u V X y Model 333A 334 Set test oscillator frequency to 2 MHz and attenuate output by 40 dB maintaining refer ence set in step j Set 333A 334A METER RANGE switch to 0 01 VOLTS Adjust A2R39 for 333A 334A meter indication of 9 mV Set test oscillator frequency to 3 MHz Adjust A2C21 for 333A 334A meter indication of 9 mV NOTE Adjustments of A2R39 and A2C21 interact Therefore it may be necessary to repeat the two ad justments to bring both within tolerance Set 333A 334A METER RANGE switch to 3 VOLTS Disconnect test oscillator and connect volt meter calibrator to 333A 334A Set voltmeter calibrator to 0 3V rms at 400 Hz Note 333A 334A meter reading Disconnect voltmeter calibrator and connect test oscillator to 333A 334A Set test oscillator frequency to 400 Hz and adjust amplitude until 333A
25. 69 8 kN 1 1 2 W MF7C T O obd 0757 0862 R fxd met flm 221 kQ 1 1 2 Ad MF7C T O obd 0698 3121 R fxd met flm 698 kN 1 1 2 W MF7C T O obd Not assigned 2100 1438 R var pot lin 10009 10 1 2 W Series 45 obd 00333 61903 Switch Assembly meter range includes C1 thru C6 R1 thru R14 S3C1 0132 0004 C var trim 0 7 3 0 pF 535 009 4R S3C2 S3C3 0140 0180 C fxd mica 2000 pF 2 RDM19F202G3C S3C4 0160 0182 C fxd mica 47 pF 2 S3C5 0140 0064 C fxd mica 62 pF 5 RCM 15E 620 J S3C6 0121 0039 C var cer trim 8 50 pF 557 062 U2PO34R S3R1 0686 2215 R fxd comp 2200 5 1 2 wi CB 2215 S3R2 0698 3138 R fxd met flm 277 50 1 4 1 4 W MF6C T O obd S3R3 0698 3139 R fxd met flm 410 260 1 4 1 4W MF6C T O obd S3 R4 0698 3138 R fxd met flm 277 50 1 4 1 4 W MF6C T O obd S3R5 0698 3139 R fxd met flm 410 260 1 4 1 4 W MF6C T O obd S3 R6 0698 3138 R fxd met fm 277 50 1 4 1 4 W MF6C T O obd S3 R7 0698 3139 R fxd met flm 410 260 1 4 1 4 W MF6C T O obd S3 R8 0698 3138 R fxd met flm 277 50 1 4 1 4 W MF6C T O obd S3R9 S3R10 0698 3139 R fxd met flm 410 260 1 4 1 4 W MF6C T O obd S3R11 0698 3137 R fxd met flm 189 70 1 4 1 4 W MF6C T O obd S3R12 0698 3146 R fxd met fim 999 kN 1 4 1 4 W MF6C T O obd S3R13 0698 3145 R fxd met flm 1 kQ 1 4 1 4 W MF6C T O obd S3R14 0683 0755 R fxd comp 7 50 5 1 4 W CB 75G5 SA 00333 61901 Switch Assembly frequency range includes C1 thru C5 R1 thru R21 0180 0197 C fxd 2 2 uF 10 200 vdew 150D225X9020
26. ADJUST cw ak a IGOPF 2400 0 1 m wzm o 1 1 I R2I R23 I 7 003 3000 5i lo I 63 1 c30 1 c25 i 22 130 I S m l FEEDBACK 390K p T I l R44 I I 100 5 EA GEES O 19 I 6 1 C3 9 o I I 27 7V0C VOLTAGE CAL o o 1 cs me y AT 2 5 MHz 2 d R 209 AMPLIFIER AMPLIFIER 3V RANGE 2 I o L3 ei 0 57vDC UN Qs MS 98 O I n 7 I V Yr 0 03V0C 1 4V0C 4 voc 3 O ro I I a 505 I 5 oop SLA I 1 SEE NOTE I I See A i I OPTION OI i 01 INSTALLED THESE PARTS DIFFER AS i l FOLLOWS I H ce DELETE o M1 VU BALLISTICS METER R47 CHANGE TO 51 OHMS R48 CHANGE TO 51 OHMS CRI ADDED R32 CHANGE TO 1800 15 IV 1 RMS for F S R49 DEFLECTION OUTPUT FEEDBACK 2k 36 R28 c20 RAI CONTACT THRU I x 24 0 47 180 THRU 4 C22 39PF i de o o 200PF 1 SEE NOTE 2 1 COPYRIGHT 1965 BY HEWLETT PACKARD COMPANY 3334 334A D O33 A Figure 7 4 Meter Amplifier P O A2 7 9 bYy s W 00000000000000000 Emigo vehb meng E 9 8 s10 22 3 19 8 U M 0 H 2u 6 amp Y E TI E lm Co 333A B 3376 No 00333 26505 Rev C hp Part 7 10 INFORMATION TROUBLESHOOTING When checki
27. Aerovox Corp bus E Burbank Cal 00015 49 Revised May 1970 Appendix A CODE LIST OF MANUFACTURERS Continued Code No 71482 71590 71616 71700 711707 71144 71785 71984 72136 72619 72656 72699 T2765 72825 72928 72962 72964 72982 73061 13076 73138 13293 73445 73506 13559 73586 13682 73734 13743 73793 13846 13899 73905 73957 74276 74455 74861 74868 74970 19042 75263 75378 15382 75818 75915 76005 76210 76433 78487 76493 76530 76545 76703 76854 77068 77075 77221 77252 77342 77630 11638 11164 77969 78189 78277 78283 78290 Manufacturer Address C P Clare Co Centralab Div of Globe Union Inc CN RENE Chicago Ill a RUP Milwaukee Wis Commercial Plastics Co Chicago ili Cornish Wire Co The New York N Y Coto Coil Co Ine Providence R I Chicago Miniature Lamp Works Chicago Ill Cinch Mfg Co Howard B Jones Div Chicago Ill Dow Corning Corp Midland Mich Electro Motive Mfg Co Inc Willimantic Conn Dialight Corp Brooklyn N Y Indiana General Corp Electronics Div Keasby N J General Instrument Corp Cap Division Newark N J Drake Mfg Co Harwood Heights Ill Hugh H Eby Inc Philadelphia Pa Gudeman Co Chicago NI Elastic Stop Nut Corp Union N J Robert M H
28. CHECK TEST CARD CONT D Accuracy Check Cont d 003 V 01V 03 V 1V 3V 1 3 10 30 100 300 Frequency Response Check 3 V range 10 Hz 1 kHz 10 kHz 100 kHz 1 MHz 2 MHz 3 MHz Frequency Response Check 0003 V range 20 Hz 30 Hz 1 kHz 10 kHz 100 kHz 300 KHz 500 kHz 10 High Pass Filter Check Specification Indication 60 Hz Rejection gt 40 dB CJ 11 Residual Noise Check Specification Indication 6002 Load lt 25 LV Lu 100 KO Load lt 30 LV CH x 00 O D co O CO aan OD CD Cp Ch CH Ja lt qqq lt lt II 0 III OO du om o EEE B lt lt lt 12 AM Detector Check Model 334A only Specification Indication Distortion gt 40 dB LJ Model 333A 334A Section VI SECTION VI REPLACEABLE PARTS 6 1 INTRODUCTION 6 2 This section contains information for ordering replacement parts Table 6 1 lists parts in alpha meric order of their reference designators and indi cates the description hp part number of each part together with any applicable notes and provides the following a Total quantity used in the instrument TQ column The total quantity of a part is given the first time the part number appears b Descriptions of the part See list of abbrevia tions below c Typical manufacturer of the part in a five digit code See Appendix for list of manu facturers Parts that are manufactured by Hewlett Packard are identified by the abbrev iat
29. NOTE sign denotes important information It calls attention to procedure practice condition or the like which is essential to highlight Model 333A 334A Table of Contents TABLE OF CONTENTS Section Page Section Page I GENERAL INFORMATION 1 3 V MAINTENANCE Cont d 5 1 1 1 Description 1 3 9 5 Performance Checks 5 1 1 8 Accessory Features SE ER 5 9 Fundamental Rejection Check 9 1 1 8 Option a 403243 94 9 188 5 10 Second Harmonic ccuracy 5 2 1 10 Instrument Identification 1 3 5 11 Instrument Induced Distortion Check 5 2 Section Page 5 12 Frequency Calibration Accuracy D INSTALLATION o 2 1 Check A ee A 5 3 2 1 Introduction 2 1 9 13 Automatic Nulling Mode Check 9 4 2 3 Inspection 2 1 5 14 Input Impedance Check 5 4 2 5 Power Requirements 2 1 5 17 Minimum Input Level Check 5 5 2 7 Three Conductor Power Cable 2 1 5 18 DC Isolation Check 5 5 2 10 Installation 4 e 2 1 5 19 Voltmeter Accuracy and 2 12 Bench Installation 2 1 Frequency Response Check 5 6 2 14 Rack Installation 2 1 5 20 High Pass Filter Check 5 7 2 16 Repackaging For Shipment 2 1 5 21 Residual Noise Check 5 7 5 22 AM Detector Check Model Section Page 334A only 5 7 II OPERATING INSTRUCTIONS 3 1 5 23 Adjustment and Calib
30. RE FEEDBACK l I I Ce S A 40 1 1 I I I t I I po I CONTROL TRANSISTOR SEE 1 03 NOTE I 6 I I I I I 8 ab I roy I I I 1 I I I I CONTROL i TRANSISTOR i Q4 i I I I I i I ci 40 i I FEEDBACK l I I I 3 gt 14 I 15 25 VDC My P P RIPPLE A om em AU mm gp o Figure 7 6 Power Supply A1 7 13 7 14 Appendix A CODE LIST OF MANUFACTURERS Model 333A 334A The following code numbers are from the Federal Supply Code for Manufacturers Cataloging Handbooks H4 1 Name to Code and H4 2 Code to Name and their latest supplements The date of revision and the date of the supplements used appear at the bottom of each page betical codes have been arbitrarily assigned to suppliers not appearing in the H4 Handbooks pon Manufacturer Address 00000 U S A Common Any supplier of U S 00136 McCoy Electronics Mount Holly Springs Pa 00213 Sage Electronics Corp Rochester N Y 00287 Cemco Inc Danielson Conn 00334 Humidial n n 5 v Colton Calif 00348 Mictron Co Ine Valley Stream N Y 00373 Gar Ine 24 ns Cherry Hil N J 00656 Aerovox Corp New Bedford 00779 Amp Ine Harrisburg Pa 00781 Aircraft Radio Corp Boonton N J 00809 Croven Ltd Whitby Ontario 00815 Northern Engineering
31. Sanne e eet een A 5 e N Y 03705 Apex Machine amp Tool Co Dayton Ohio 03797 Eldema Corp 0 Compton Calif 03818 Parker Seal Co Los Angeles Cal 03877 Transitron Electric Corp Wakefield Mass 03888 Pyrofilm Resistor Co Inc a Cedar Knolls N J 03954 Singer Co Diehl Div Finderne Plant Sumerville N J 04009 Arrow Hart and Hegeman Elect Co 1 1 Hartford Conn 04013 Taruus Corp Lambertville N J 04062 Arco Electronic Inc Great Neck N Y 04217 EssexWire Los Angeles Cal 04222 Hi Q Division of Aerovox Myrtle Beach S C 04354 Precision Paper Tube Co Wheeling Ill 04404 Palo Alto Division of Hewlett Packard Co Palo Alto Cal 04651 Sylvania Electric Products Microwave Device Div Mountain View Cal 04673 Dakota Engr Inc Culver City Cal 04713 Motorola Inc Semiconductor Prod Div Phoenix Arizona 04732 Filtron Co Inc Western Die ine cane Culver City Cal 04773 Automatic Electric Co Northlake 04796 Sequoia Wire Co Redwood City Cal 04811 Precision Coil Spring Co El Monte Cal 04370 P M Motor Company Westchester DL 04919 Component Mfg Service CO REECH ea W Bridgewater Masa 03006 Twentieth Century Plastics IRE aie EE nea Los Angeles Cal 05277 Westinghouse Electric Corp Semiconductor Dept Youngwood Pa 00015
32. acq MAN y m y Wm TN ree FO y HI MIL 4 ey R7 201 S2C2 S2C3 S2C4 S205 R8 Figure 5 8 Adjustment and Chassis Mounted Component Location 5 9 Section V C d e Set voltmeter calibrator to 1 mV rms output at 400 Hz Adjust A2R34 400 Hz CAL for a meter in dication of 1 0 mV Set Voltmeter Calibrator to 0 3 mV rms output Set 333A 334A METER RANGE switch to 0 0003 VOLTS The meter should indicate 300 LV 6 UV 2 If necessary change value of A2R30 to set reading within these limits Typical values for this resistor are from 1500 to 3009 Increasing resistance decreases the meter reading and vice versa NT 5 28 VOLTMETER FREQUENCY RESPONSE ADJUSTMENT gt a C e g Connect test oscillator to 333A 334A as shown in Figure 5 1 NOTE Cover plate Item 33 in Figure 6 1 must be in place before performing these adjustments Set 333A 334A controls as follows FUNCTION VOLTMETER METER RANGE 0 0003 VOLTS Set test oscillator to 400 Hz and adjust amp litude for 333A 334A meter indication of 300 LV Seta reference on meter of test oscil lator and use amplitude control to maintain set reference whenever frequency of oscil lator is varied Set test oscillator frequency to 20 Hz 333A 334A meter should indicate 300 uV 15uV If reading exceeds these limits change value of A2C30 Typical values for this capacitor are between 10 uF and
33. dial and vernier balance controls for best null indication on meter Do not change frequency or balance settings after best null is obtained Set 333A 334A FUNCTION switch to SET LEVEL and set METER RANGE switch to OdB Set test oscillator frequency to 30 Hz and adjust amplitude for OdB indication on 333A 334A meter Set 333A 334A FUNCTION switch to DIS TORTION Meter reading should not change more than 1 dB from OdB reference Repeat Steps b through h for each respective frequency and second harmonic listed in Table 5 3 333A 334A meter readings should remain within tolerances listed in table Second Harmonic Accuracy Check 333A 334A TEST OSCILLATOR FREQUENCY Second Harmonic 5 12 INSTRUMENT INDUCED DISTORTION CHECK a Connect test equipment to 333A 334A as FILTER SET WHITE 2640 Shown in Figure 5 3 Set filter pass fre quency to 500 Hz Set 333A 334A controls as follows FUNCTION SET LEVEL SENSITIVITY VERNIER MIN METER RANGE ODB MODE MANUAL FREQUENCY RANGE X100 Frequency D al 5 DISTORTION ANALYZER hp 333A 334A SE SEPARATE LEADS LESS THAN 12 LONG Figure 5 3 Instrument Induced Distortion Check 5 3 Section V c Set test oscillator frequency to 500 Hz and adjust amplitude for indication of 2 dB on 333A 334A meter d Set 333A 334A FUNCTION switch to DIS TORTION b e Adjust 333A 334A frequency
34. dial vernier and BALANCE controls for minimum meter in dication When meter indication is less than 10 of SET LEVEL indication set MODE switch to AUTOMATIC f Reduce 333A 334A METER RANGE setting C as necessary to maintain on scale meter indication g 333A 334A meter indication should be at d least 70 dB below 2 dB reference h Repeat steps b through g with 333A 334A and test equipment frequencies set to 250 kHz and 600 kHz 333A 334A meter indi cation should be at least 64 dB below 2 dB reference f 5 13 FREQUENCY CALIBRATION ACCURACY CHECK a Connect test equipment to 333A 334A as shown in Figure 5 4 Set electronic counter to read period h NOTE In this check the 333A 334A frequency dial is held constant and the input frequency is varied Model 333A 334A and monitored If the dial is low the input frequency will be high at null and vice versa Set 333A 334A controls as follows FUNCTION SET LEVEL SENSITIVITY 394999 MAX METER RANGE ODB MODE MANUAL FREQUENCY RANGE oe 6 696 6 4l Frequency Dial 10 Set test oscillator frequency to 10 Hz and adjust amplitude for indication of 2 dB on 333A 334A meter Set 333A 334A FUNCTION switch to DISTORTION Do not adjust 333A 334A frequency controls Adjust test oscillator frequency and 333A 334A BALANCE controls for minimum indi cation on 333A 334A meter
35. fxd met flm 1802 1 1 8 W Opt 01 only R fxd met flm 10 09 1 1 8 W var ww lin trim 500 10 1 5 W MFF 1 8 T 1 CEA T O obd CEA T O obd 110 9 CEA T O CB 3945 R fxd met fim 10 00 1 1 8 W R fxd comp 390 kN 5 1 4 W CB3025 fxd comp 30000 5 1 4 W CB1015 fxd comp 1002 4595 1 4 W var cermet flm lin trim 5000 10 1 2 W fxd met fim 36 50 1 1 8 W fxd comp 1800 5 1 4 W a waw CEA T O CB1815 R fxd comp 108 5 1 4 W CB1005 fxd comp 24000 5 1 4 W CB2425 fxd comp 1000 5 1 4 W CB1015 fxd comp 242 5 1 4 W CB2405 fxd comp 30000 5 1 4 W CB3025 CB5115 CB5105 fxd comp 5109 5 1 4 W fxd comp 519 595 1 4 W Option 01 only fxd comp 20000 5 1 4 W fxd comp 120 kO 5 1 4 W CB2025 CB1245 mm mu mum Assembly etched circuit board rejection amplifier includes C1 thru C15 Q1 thru Q6 CRI Ri thru R33 xd Al elect 100 1F 75 10 12 vdcw fxd Al elect 200 uF 75 10 3 vdew 0D107G012CC2 DSM 30D207G003CC2 DSM 150D395X9035B2 fxd Ta elect 3 9 uF 10 35 vdcw obd fxd mica 39 pF 5 na na gt Option 01 only Model 333A 334A Section VI Table 6 1 Replaceable Parts Cont d REFERENCE hp DESIGNATOR PART NO Bis DESCRIPTION Lr MFR PART NO A3C5 0140 0199 fxd mica 240 pF 5 A3C6 0180 0022 fxd Ta elect 3 9 uF 10 35 vdew A3C7 0170 004
36. indication on 333A 334A meter Set 333A 334A FUNCTION switch to DIS TORTION Adjust 333A 334A frequency dial vernier and BALANCE controls for minimum meter indication Reduce METER RANGE setting as necessary to maintain on scale meter reading Note meter reading Set 333A 334A FUNCTION and METER RANGE switch respectively to SET LEVEL Then set FUNCTION switchto DISTORTION Adjust 333A 334A frequency dial vernier and BALANCE controls for meter indication of less than 3 of set level 2 dB Set 333A 334A MODE switch to AUTOMATIC Reduce METER RANGE setting as necessary to maintain on scale meter reading Meter reading should be within 3 dB 0dB of manually nulled reading obtained in step f Repeat steps b through i with 333A 334A frequency dial set to 50 and test oscillator frequency set to 50 Hz Set 333A 334A controls as follows FUNCTION SET LEVEL METER RANGE SET LEVEL MODE MANUAL FREQUENCY RANGE X10 Frequency Dial oo 50 p q Section V Set test oscillator frequency to 500 Hz at an amplitude of 1 V Adjust SENSITIVITY controls for 2 dB in dication 333A 334A meter Set 333A 334A FUNCTION switch to DISTOR TION Adjust 333A 334A frequency dial vernier and BALANCE controls for minimum meter indi cation Reduce METER RANGE setting as necessary to maintain on scale meter read ing Note meter reading Set 333A 334A FUNCTION and ME
37. ratio betweenthe average and effective rms values of a pure sine wave The ratio of average to effective values in a true sine wave is approximately 0 9to 1 When the meter is used to measure complex waves the voltage indicated may not be the rms value of the signal applied This deviation of meter indica tion exists because the ratios of average to effective values are usually not the same in a complex wave as in a sine wave The amount of deviation depends on the magnitude and phase relation betweenthe harmonics and fundamental frequency of the signal applied Table 3 1 lists the deviation of the meter indication of a sine wave partly distorted by harmonics As in dicated in the table harmonic content of less than 10 results in very small errors Table 3 1 Effect of Harmonics on Voltage Measurements Input Voltage True Meter Characteristics RMS Value Indication Fundamental 100 100 Fundamental 10 100 2nd harmonic Fundamental 20 2nd harmonic Fundamental 50 2nd harmonic Fundamental 10 3rd harmonic Fundamental 20 3rd harmonic Fundamental 50 3rd harmonic 100 102 100 110 96 104 94 108 90 116 NOTE This chart is universal in application since these errors are inherent in all average responding voltage measuring instruments 3 11 When making distortion measurements where tne fundamental frequency is suppressed and the re mainde
38. than the third harmonic andthethird more than the fourth The result of the negative feed back is illustrated by the rejection characteristic Shown in dashed lines on the attenuation and phase characteristic of Figure 4 3 Figure 4 6 shows a Simplified block diagram of the rejection amplifier with the typical frequency rejection characteristic Refer to Figure 4 7 Bandwidth Versus Null Depth for further detail on the rejection characteristic 4 39 HIGH PASS FILTER Refer to Figure 7 3 4 40 The HIGH PASS FILTERis normally used when the fundamental of the input signal is greater than 1 kHz In the voltmeter mode of operation the filter is not used In SET LEVEL and DISTORTION func tions the filter presents gt 40 dB attenuation to 50 or 60 Hz hum components but offers no attenuation to frequencies over 1 kHz The filter assembly AN consists of ATC1 A7C2 and A7L1 The filter can be inserted or bypassed by the HIGH PASS FILTER switch S9 4 41 METER AMPLIFIER Refer to Figure 7 4 4 42 The meter amplifier consists of the post atten uator the meter amplifier circuit and the meter rectifier circuit 4 43 POST ATTENUATOR 4 44 The post attenuator S3R1 through S3R11 is a resistive network which attenuates the input signal in 10 dB steps The attenuator is usedin conjunction with either the input sensitivity attenuator or the 1000 1 attenuator to limit the signal level to the meter amplifier to 1 mV for full sca
39. 0 fxd my 0 047 LF 10 200 vdew A3C8 0180 0039 fxd Al elect 100 uF 75 10 12 vdcw 150D395X9035B2 192P47392 PTS 30D107G012CC2 DSM 30D307G006DF2 DSM 0180 0062 fxd Al elect 300 uF 100 10 6 vdcw A3C9 RDM15F151J3C fxd mica 150 pF 25 A3C10 0140 0196 C A3C11 0140 0110 C fxd mica 127 pF 42 RDM15E 127 G A3C12 0180 0104 C fxd Al elect 200 LF 75 10 15 vdcw 30D207G015DF4 DSM fxd Al elect 500 pF 7595 10 15 vdew 34D507G015FJ4 A3C13 0180 0307 DSB A3C14 0140 0191 C fxd mica 56 pF 5 300 vdew RCM15E560J 300 V A3C15 0180 0307 fxd Al elect 500 LF 75 10 15 vdew 34D507G015FJ4 DSB FD3444 A3CR1 1901 0053 Diode Si 30V working low leakage A3Q1 1854 0215 TSTR Si NPN 2N3904 Sps 3611 A3Q2 1854 0297 TSTR Si NPN 310 mW MPS 6513 5 A3Q3 1854 0354 TSTR Si NPN 824817 A3Q4 1855 0209 TSTR Si A3Q5 1854 0354 TSTR Si NPN 824817 2N3906 5 A3Q6 1853 0036 TSTR Si PNP 2N3906 A3R1 0683 2415 fxd comp 240 245 1 4 W CB2415 A3R2 0683 1245 R fxd comp 120 kQ 5 1 4 w CB1245 A3R3 0683 1035 R fxd comp 10 kN 5 1 2 W EB1035 A3R4 2100 2522 R var lin trim 10 kQ 10 1 2 W 62 227 1 A3R5 0686 2015 R fxd comp 2009 5 1 2 W EB2015 EB3625 R fxd comp 3 6 kN 5 1 2 W CB1035 0686 3625 A3R
40. 01 V CO 2 Fundamental Rejection Check Specification Indication 3 Second Harmonic Accuracy Check Specification Indication Indication 15 Hz lt 1 0 dB Ll 10 kHz 0 6 dB Ed 50 kHz 1 0 dB C 200 kHz lt 2 0 dB C 500 kHz lt 3 0 dB C Instrument Induced Distortion Check Specification Indication 500 Hz gt 70 dB EJ 250 kHz gt 64 dB E 600 kHz 64 dB CJ Frequency Calibration Accuracy Check Specification Indication 10 Hz 95 msec to 105 msec LZ 1 kHz 950 Hz to 1050 Hz E 100 kHz 95 kHz to 105 kHz 200 kHz 190 kHz to 210 kHz LL 400 kHz 360 kHz to 440 kHz C 600 kHz 540 kHz to 660 kHz Cc Specif ication Indication Within 3 dB 0 dB of manual null Within 1 5 dB 0 dB of manual null Specification Indication 1 MQ 5 1 MQ 5 6 Automatic Nulling Mode Check 25 Hz 50 Hz 500 Hz 5 kHz 50 kHz 500 kHz Ul Input Impedance Check Resistance Check Voltmeter Resistance Check Set Level Capacitance Check Voltmeter 30 pF 333A 1V 35 pF 334A LN lt 70 pF Capacitance Check Set Level EG lt 70 pr Specif ication Indica ion 100 set level Specification Indication No change in indication No indication 1V 8 Minimum Input Level Check 0 3 V 9 DC Isolation Check 333A 334A Meter Power Supply Ammeter Utd PERFORMANCE
41. 1737 Gremar Mfg Co Inc Wakefield Mass 91827 KF Development Co Redwood City Cal 1886 Malco Mfg Inc Chicago DL Model 333A 334A CODE LIST OF MANUFACTURERS Continued Code No 91929 91961 92180 92367 92601 92703 93332 93369 93410 93632 93929 94137 94144 94148 94154 94191 94222 94330 94375 94682 94696 95023 95146 95236 95238 95263 95265 95275 95348 95354 95566 95712 95984 95987 96067 Manufacturer Addresa Honeywell Inc Micro Switch Division rr Em Freeport Ill Nahm Bros Spring Co Oakland Cal Tru Connector Corp Peabody Mass Elgeet Optical Co Inc Rochester N Y Tensolite Insulated Wire Co inc PNE ye wn N Y IMC Magnetics Corp Westbury L I N Y Hudson Lamp Co Kearney N J Sylvania Electric Prod Ine a Semiconductor Div Woburn Mass Robbins Myers Inc Pallisades Park N J Stemco Controls Div of Essex Wire Corp Mansfield Ohio Waters Mfg Co Culver City Cal G V Controls Livingston N J General Cable Corp Bayonne N J Raytheon Co Comp Div Ind Comp Operations Quincy Mass Scientific Electronics Products Inc Loveland Colo Wagner Elect Corp Tung Sol Div Newark N J Curtiss Wright Corp Electronics Div East Patterson N J South Chester Co
42. 22 1500 0004 5060 0020 5060 0021 5000 0637 3050 0180 00331 00102 2460 0004 2190 0057 Casting Cap drive Gear Spur assembly Shaft Bracket cap mounting Set Screw Coupler insulator Gear assembly Gear assembly Spring thrust Washer Plate cap mounting Bolt Lock washer 3050 0017 Washer 3101 0889 Switch slide DPDT S9 Figure 6 3 Frequency Tuning Assembly hp Part No 00333 60701 NOTE Items 1 through 11 are not included in assembly and must be ordered separately Section VI Model 333A 3344 Table 6 1 Replaceable Parts Cont d REFERENCE hp DESIGNATOR PART NO MJ DESCRIPTION MPR MFR PART NO 00333 66501 0180 0308 0180 0061 A1C1 A1C2 A1C3 0150 0085 A1C4 A1C5 0180 0058 0180 0050 0180 0039 A1C6 A1C7 A1C8 A1C9 0180 0061 0180 0059 0180 0050 A1C10 A1C11 1901 0026 A1CR1 thru A1CR6 A1CR7 A1Q1 A1Q2 A1Q3 A1Q4 A1Q5 A1Q6 AIRI 1902 0045 1854 0062 1854 0039 1853 0012 1854 0062 A1R2 0766 0029 A1R3 0686 1025 A1R4 0686 7525 0686 6825 0698 4471 A1R5 A1R6 A1R7 0757 0440 A1R8 0686 1025 A1R9 0766 0029 A1R10 A1R11 0686 6825 0686 7525 2100 2633 0686 2025 0686 5125 00333 66512 00333 66508 0140 0201 0140 0200 A2C1 A2C2 A2C3 Assembly etched ci
43. 2R41 A2RA2 0883 1005 A2R43 0683 2425 A2R44 0683 1015 A2R45 0683 2405 A2R46 0683 3025 0683 5115 0683 5105 A2R47 A2R48 A2R47 A2R48 A2R49 A2R50 A2R51 0683 2025 0683 1245 00333 66503 A3 0180 0039 0180 0060 0180 0022 0140 0190 See Appendix C for backdating SES Model 3334 3344 Table 6 1 Replaceable Parts Cont d DESCRIPTION MPR MFR PART NO R fxd comp 10000 5 1 4 W 01121 CB1025 4 R fxd comp 30000 5 1 4 W CB3025 R fxd comp 10000 5 1 4 W CB1025 R fxd comp 7509 5 1 4 W CB7515 R fxd comp 15 KO 595 1 4 W CB1535 R fxd comp 43 kQ 5 1 4 W CB4335 R fxd comp 6200 15 1 4 W CB6215 R fxd comp 6802 5 1 4 W CB6815 R fxd comp 1509 5 1 4 W CB1515 fxd comp 4702 5 1 4 W CB4715 m R fxd comp 470 5 1 4 W CB4705 R fxd comp 6200 5 1 4 W CB6215 R fxd comp 242 5 1 4 W CB2405 R fxd comp 2008 5 1 4 W CB2015 R var lin trim 10 kQ 10 1 2 W R fxd comp 30000 5 1 4 W CB3025 R fxd comp 5108 5 1 4 W CB5115 R fxd comp 518 5 1 4 W CB5105 R fxd comp 68000 5 1 4 W CB6825 fxd comp 2000 5 1 4 W CB2015 CB2025 R fxd comp 20002 5 1 4 W R fxd comp 12 kN 5 1 4 W CB1235 R fxd comp 240 5 1 4 W CB2405 R fxd carbon fim 4 420 1 1 2 W DCS 1 2 fxd comp 3008 4595 1 4 W CB 3015 Not assigned fxd met fim 1910 1 1 8 W R
44. 3 6K 255K 4 a c9 E 5 O ws 2 2PF i o S4RIB S4Ri7 1 4 75K 26 IK 5 O K S4R20 S4RI9 y 1 40K 1 65K 6 t S AE 10 gt gt 9 E O FINE t e BALANCE i E COARSE 27770 BAL ANCE f 6 ce 39P ag A J Y Ri6 z 5K 4 4 an SEE NOTE 3 oi R37 RI7 cg w 330 3K 100 3 4 PR Kon p SS W 4 4 0 23 DC A C7 S 9 947 a AMPL 1 05 VDC J d BRIDGE AMPLIFIER Q4 05 Q6 20 8v0C O A SEE NOTE 3 e TP2 s Une R24 A 9 5v2 5 0C a 2000 FEEDBACK z 4 A 3 RI9 100 FEEDBACK R25 CI2 2K 200 R26 47 AN R28 IOK e M M a T FILTER 00333 66507 c2 cl i 0 47 1 3 siii erilize isa serali cretini Se S A m LIL A GD A alle Figure 7 3 Rejection Amplifier A3 Bridge Balance P O A6 and High Pass Filter A7 7 7 7 8 BACKDATING INFORMATION NOTE 1 A2R3 R20 R39 are different in some earlier instruments and are not directly interchangeable with the ones listed in Table 6 1 See Appendix C Change No 11 for applicable serial numbers NOTE 2 A2C29 was 390 pF in some earlier instruments Do not change A2C29 to the value shown in Table 6 1 unless a frequency response prob lem is encountered on the 300 u V range See Appendix C for applicable serial numbers Change No 7 NOTE 3 S3C4 was 22 pF and A2C19 was 680 pF on s
45. 3 in 11 OD 28 AWG 30J8119 1 Model 333A 334A Section VII SECTION VII CIRCUIT DIAGRAMS 7 1 INTRODUCTION diagrams as well as component location drawings of each printed circuit board 7 2 This section contains circuit diagrams to aid in 7 3 General schematic notes which apply to all the the operation and maintenance of the Models 333A and gt 334A Figure 7 1 is an internal wiring diagram that schematic diagrams are listed on page 7 2 shows the colors of the circuit board wires 7 4 An explanation of terms and symbols used on Figures 7 2 through 7 6 contain detailed schematic the schematic diagrams is given below REFERENCE DESIGNATIONS ASSEMBLY ASSE M REFERENCE ASSEMBLY PART N UMBER DESIGNATION NAME INCLUDES AZA SUBASSEMBLY POWER SUPPLY OOXXX 66501 PLUG PI IS MOUNTED ON ASS LY OR IS PAR A idi OF THE ASSEMBLY BOARD COMPLE TE DESIGNATOR IS A2PI JACK XA2 IS MOUNTED ON CHASSIS OR ANOTHER ASSEMBLY DENOTES SIGNAL CONNECTION i i PI IS NOT MOUNTED RS TEST NS Qi NM ON A2 ASSEMBLY 42 92V COMPLETE DESIGNATOR IS PI 3 Ari COMPLETE DESIGNATOR IS A2R4 i R4 OENOTE ON WHICH CONNECTION IS MADE SUBASSEMBLY OF A COMPLETE DESIGNATOR IS ALA Rom INDICATES Al PIN OF XA2 AND P 5HOTO CHOPPER OSC zb MALE r had wem ec o RI Re EYELET OR STAND AWAY OR M WHT RED WIRE I OFF TERMINAL MAY OR R IND SECONO MAY NOT BE NUMBERED MPLETE NOT BE NUM e THE THIRD IND
46. 33 kO 5 1 4 W CB3335 A3R34 0683 1035 fxd 10kQ 5 1 4 w CB 1035 A3R35 A3R36 0683 4705 fxd 41025 1 AW CB 4705 ZU Dmm fxd 330 2 5 1 4w CB 3315 A3R37 0683 3315 Section VI Model 333A 334A Table 6 1 Replaceable Parts Cont d REFERENCE hp DESIGNA TOR PART NO RZ DESCRIPTION MFR MFR PART NO 00332 66502 Assembly etched circuit board RF detector 334A only includes C1 thru C3 L1 and L2 CRI A4C1 A4C2 0140 0180 C fxd mica 2000 pF 2 RDM19F202G3C A4C3 0140 0156 C fxd mica 1500 pF 2 RDM19F152G3C A4CRI 1910 0016 Diode Ge 60 wiv 1 ms D2361 A4L1 A4L2 9140 0052 Coil RF 3 3 mH WC 611 AS 00333 66505 Assembly auto control board includes C1 thru C31 Q1 thru Q18 CR1 thru CR6 Ri thru R71 A5C1 0180 0064 C fxd Al elect 35 uF 75 10 6 vdew 30D356G006BB2 DSM A5C2 0180 0063 C fxd Al elect 500 uF 75 10 3 vdew 30D507G003DF2 DSM A5C3 0150 0093 C fxd cer 0 01 LF 80 20 100 vdew TA obd A5C4 0180 0224 C fxd Al elect 10 uF 75 10 15 vdew 30D106G015A2 DSM A5C5 A5C6 0180 0058 C fxd Al elect 50 uF 75 10 25 vdew 30D506G025CC2 DSM A5C7 0150 0093 C fxd cer 0 01 LF 80 20 100 vdew TA obd A5C8 0180 1737 C fxd Al elect 2600 uF 75 10 2 5 vdcw 34D268G2R5FP4 DSB A5C9 0140 01
47. 334A meter in dication is same as in step r Set a refer ence on meter of test oscillator and use amp litude control to maintain set reference when ever frequency of oscillator is varied Set test oscillator frequency to 2 5 MHz Adjust S3C6 for 333A 334A meter indication of 0 3 V Set 333A 334A METER RANGE switch to 3 VOLTS Set test oscillator frequency to 200 kHz and increase amplitude by 20 dB maintaining reference set in step t Adjust S3C1 for 333A 334A meter indication of 3 V 5 29 BRIDGE BALANCE ADJUSTMENT b MAINTAIN THE LEAD DRESS TO C3 AND THE TUNING CAPACITOR C4 ANY CHANGE IN LEAD DRESS WILL CAUSE CHANGE IN CAPACITANCE Connect test equipment to 333A 334A as shown in Figure 5 4 Set 333A 334A controls as follows FUNCTION 4 2 e s SET LEVEL Model 333A 334A c g h 5 30 SENSITIVITY VERNER MIN SENSITIVITY 1 step counterclockwise METER RANGE SET LEVEL MODE MANUAL FREQUENCY RANGE XIK Frequency Dial 60 Turn slot on trimmer capacitor C3 parallel with side casting of instrument Set test oscillator frequency to 60 kHz and adjust amplitude for indication of 2 dB on 333A 334A meter Set 333A 334A COARSE and FINE BALANCE controls to center of range Set 333A 334A FUNCTION switch to DIS TORTION Adjust test oscillator frequency vernier con trol and C3 for definite null indication on meter of 3
48. 33A 334A Section V Table 5 8 Troubleshooting Aid 1 FRONT PANEL SYMPTOMS No meter deflection with signal at input ON lamp not illuminated ALL FUNCTIONS No meter deflection with signal at input Output normal All FUNCTIONS Will not null manually VOLTMETER and SET LEVEL FUNCTIONS normal No SENSITIVITY VERNIER control in SET LEVEL mode BALANCE controls erratic DISTORTION FUNCTION only No meter deflection with RF input DET only R F Low meter reading with input signal frequency below 1 kHz Set Level Function only Check Fuse F1 Check M1 Check A4AF C4A D C3 R4 R5 A6DS1 and A6V1 Check R2 R3 and S2R8 A3 Check R and R5 Check diode A4CR1 side of A4 shield Spare diode located on out Check to see if high pass filter is in the OUT position 2 INTERNAL ADJUSTMENT SYMPTOMS Insufficient 25 volts adjustment with A1R13 measured at any violet wire 25 volts supply out of specs measuredat any red wire Insufficient bias adjustment with A2R3 meas ured at A2T P1 Insufficient bias adjustment with A2R20 meas ured at A2T P2 Insufficient 400 Hz adjustment with A2R34 Insufficient gain adjustment with A2R39 Insufficient 3 MHz calibration adjustment with A2C21 Insufficient bias adjustment with A3R4 meas ured at A3T P1 Insufficient bias adjustment with A3R16 meas ured at AST P2 Check A1C1 A1C11 A1CR3 A1CR4 A1CR7 and A1Q4 throu
49. 33A 334A Reduce METER RANGE setting as necessary to maintain on scale reading Observe electronic counter indication If test oscillator frequency is not between 57 kHz and 63 kHz 333A 334A frequency dial is out of tolerance Follow steps be low to bring frequency dial within tolerance 1 Set 333A 3344 controls as in step b Set test oscillator frequency for elec tronic counter indication of 60 00 kHz and adjust amplitude for indication of 2 dB on meter of 333A 334A 2 Set 333A 334A COARSE and FINE BAL ANCE controls to center of range 3 Adjust 333A 334A frequency dial vernier control for definite null 4 Remove knob from frequency dial Do not change tuning capacitor C4 setting 5 Loosen retaining screws in frequency dial plate and slip dial until 60 is dir ectly under mark on indicator Be careful not to change C4 setting 6 Tighten retaining screws and replace knob SENSITIVITY SWITCH CALIBRATION a Connect test oscillator to 333A 334A as shown in Figure 5 1 NOTE Selector positions for the SENSI TIVITY selector will be referred to as follows MIN Position 1 next step Position 2 etc to MAX Position 6 Section V b Set Distortion Analyzer controls as follows FUNCTION SET LEVEL METER RANGE 0 01 VOLTS SENSITIVITY Position 5 SENSITIVITY VERNIER MAX c Set test oscillator frequency to 400 Hz ad just amplitude for indicati
50. 49 Revised May 1970 Code No 05347 05397 05574 05593 05616 06624 05728 05729 05783 05830 06004 06090 06175 06402 06540 06555 06666 06751 06812 06980 07088 07126 07137 07138 07149 07233 07256 07261 07263 07322 07387 07397 07700 07829 07910 07933 07980 08145 08289 08358 08524 08664 08717 08718 08727 08792 08806 08984 09097 09134 09145 09250 09353 09569 09795 09922 10214 10411 10646 Manufacturer Address Ultromix Ine San Mateo Cal Vane Carbine band Elect PE e e New York N Y Inc UN Canoga Park Cal Icore Electro Plastics Inc Sunnyvale Cal Cosmo Plastic c o Electrical Spec Co Ohio Barber Colman Co Rockford Di Tiffen Optical Co CY Roslyn Heights Long sland UN Y Metro Tel Corp Westbury N Y Stewart Engineering Co Santa Crus Cal Wakefield Engineering Inc Wakefield Mass Bassick Co Div of Stewart Warner Corp Bridgeport Conn Raychem Corp Redwood City Cal Bausch and Lomb Optical Co m os Rochester N Y E T A Products Co o America Chicago Ill Amatom Electronie Co Inc New Rochelle N Y Beede Electrical Instrume Co eee ea Penacook N H General Devices Co Inec Indianapolis Ind Components Inc Aris Div Phoenix Arizona Torrington Mfg Co West Div Van Nuys C
51. 50 pF should be avoided to maintain the accuracy of meter readings 3 14 OPERATING PROCEDURES 3 15 INSTRUMENT TURN ON a Set the 115 230 VAC switch to coincide with the line voltage in use Turn switch to ON position Pilot lamp will glow indicating application of primary power 3 16 ADJUSTMENT OF METER MECHANICAL ZERO 3 17 The meter is properly zero set when the pointer rests over the zero calibration mark and the instrument is in its normal operating enivronment and is turned off Zero set the meter as follows to obtain maximum accuracy and mechanical stability a Turn instrument on and allow it to operate for at least 20 minutes to let meter move ment reach normal operating temperature b Turn instrument off and allow 30 seconds for all capacitors to discharge c Rotate zero adjustment screw clockwise un til pointer is left of Zero and moving upscale d Continue rotating screw clockwise stop when pointer is exactly at zero e When pointer is exactly over zero rotate adjustment screw slightly counterclockwise to relieve tension on pointer suspension If pointer moves off zero repeat steps c through e but make counterclockwise rotation less 3 18 DISTORTION MEASUREMENT DO NOT EXCEED THE INPUT VOLT AGES LISTED BELOW TO PREVENT DAMAGING COMPONENTS ON A2 BOARD VOLTMETER FUNCTION 1V RANGE AND BELOW AND DISTORTION ANALYZER FUNCTION MAXIMUM SENSITIVITY 1 300 V ABOVE 100 Hz 2 90 V ABOVE 1 k
52. 6 A3R7 0683 1025 R fxd comp 10 kN 5 1 4 W A3R8 0683 6825 fxd comp 6800 Q 5 1 4 W CB6825 A3R9 0757 0281 fxd met fim 2 74 kN 41 1 8 W CEA T O obd fxd comp 150 5 1 4 W CB1515 A3R10 0683 1515 fxd comp 20 kO 5 1 4 W CB2035 A3R11 0683 2035 A3R12 0757 0435 fxd fim 3920 Q 1 1 8 W A3R13 0698 4471 fxd flm 7 15 KR 1 1 8 w A3R14 0757 0281 fxd met flm 2 74 kQ 1 1 8 W A3R15 0683 1265 fxd comp 12MQ 5 1 4 W CB1265 A3R16 2100 2489 var lin trim 5 kQ 10 1 2 w 62 226 1 A3R17 0683 3025 fxd comp 3000 N 5 1 4 W CB3025 A3R18 0683 7525 fxd comp 7500 Q 5 1 4 W CB7525 A3R19 0683 1015 fxd comp 100 5 1 4 W CB1015 fxd comp 3600 5 1 4 W CB3625 A3R20 0683 3825 A3R21 CB5615 fxd comp 560 N 5 1 4 W 0683 5615 A3R22 0683 3015 fxd comp 300 N 5 1 4 W CB3015 A3R23 0683 3315 fxd comp 330 2 5 1 4 W CB3315 A3R24 A3R25 0683 2025 fxd comp 2000 N 5 1 4 W CB2025 CB4705 DADDY mmmom PU mun fxd comp 47 5 1 4 W A3R26 0683 4705 A3R27 A3R28 A3R29 A3R30 A3R31 A3R32 CB2015 CB1035 CB7525 CB3335 fxd comp 200 2 5 1 4 W fxd comp 10 kQ 5 1 4 W fxd comp 7500 N 5 1 4 W ot assigned fxd comp 33 KO 5 1 4 W 0683 2015 0683 1035 0683 7525 0683 3335 fxd flm 13 kQ 1 1 8 W 0757 0445 A3R33 0683 3335 fxd comp
53. 8 a 1137403315 17 nem i ne 6 thru 13 7 thru 13 334A Instrument Serial Prefix Make Manual es perm NOTE a PTT M FE mme NE Model 333A 334A CHANGE 1 CHANGE 2 Appendix C Manual Backdating Changes Model 333A 334A Page 2 Table 6 1 Add A1C8 0150 0085 C fxd cer 0 0022 uF 500 vdcw Change A2R51 to 0683 7535 R fxd comp 75 kN 1 4 W 25 Figure 7 4 Change value of A2R51 to 75 kN Figure 7 6 Add Capacitor A1C8 0 0022 uF between cathode of A1CR7 and base of A1Q5 Table 6 1 Change A2C12 to 0150 0084 C fxd cer 0 1 uF 80 20 50 vdcw Change A2C20 to 0180 1735 C fxd 0 47 uF 10 35 vdew Change A2R16 and A2R28 to 0683 1005 R fxd comp 10 ohms 5 1 4 W NOTE 1 Excluding 822 01787 01791 01792 01794 01796 01799 thru 01802 01806 thru 01808 NOTE 2 Excluding CHANGE 3 CHANGE 4 CHANGE 5 CHANGE 6 C 2 01811 01813 01817 01823 01824 01825 01827 01829 01830 01832 01834 01835 01837 01839 01842 01844 01845 01848 01851 01852 01853 01855 01858 01861 and 01863 910 01493 01494 01495 01497 01500 01501 01503 01504 01507 01508 01509 01510 01512 01514 01515 01516 01518 01520 01521 and 01524 Figure 7 2 Change value of A2R16 to 10 ohms Change value of A2C12 to 0 1 uF Figure 7 4
54. 9 4 W od zesinn oc c3 on Section VI Model 333A 334A t A U m NENNEN B LINII Ya O NZ c vay U H T P O Figure 6 1 Mechanical Parts Model 333A 334A Section VI hp E E Se e e OOO O ee e Ce ooo 00331 00104 00331 04301 5040 0601 00331 01202 00331 01203 00333 04001 5040 5158 0370 0160 0370 0025 00331 01201 0370 0046 0370 0113 0380 0200 0370 0112 1510 0091 00333 01202 00331 00103 1251 0135 00331 00601 00331 00602 0340 0099 1510 0534 00331 00101 00331 00603 0370 0117 0370 0114 5040 0669 61B 40D 4 5020 0630 0340 0100 00331 01204 00332 00602 00331 04102 DD ra mmo ka Wa CO NY b P bb k de bb d Feb be M M M k M M DD pa k ka CJI CI x Gusset Center Plate Panel Glide Plastic Bracket PC Board Mount Rear Bracket PC Mount Dial Plate Indicator Dial Knob Round black Knob Round black vernier Bracket Support Knob Lever witch black Knob Skirted Bar black Standoff Hinged Knob Skirted Bar black Binding Post Assembly red Bracket PC Mounting Gusset Side Connector Printed Circuit 15 pin Shield Divider Shield SW Function Insulator Binding Post Binding Post Assembly Deck Shield SW Range Knob Skirted black Knob
55. 95 C fxd mica 130 pF 5 RDM15F131J3C A5C10 0180 1735 C fxd Ta elect 0 22 uF 10 35 vdcw 150D224X9035A2 DYS A5C11 0150 0093 C fxd cer 0 01 uF 80 20 100 vdew TA obd A5C12 A5C13 0180 0064 C fxd Al elect 35 uF 75 10 6 vdew 30D356G006BB2 DSM A5C14 0160 0179 C fxd mica 33 pF 5 RDM15E330J3S A5C15 0180 0161 C fxd Ta elect 3 3 uF 20 35 vdew 150E335X0035B2 DYS A5C16 0180 1735 C fxd Ta elect 0 22 uF 10 35 vdcw 150D224X9035A2 DYS ASCIT A5C18 0180 0224 C fxd Al elect 10 uF 75 10 15 vdew 30D106G015BA2 DSM A5C19 A5C20 0180 0058 C fxd Al elect 50 uF 75 10 25 vdew 30D506G025CC2 DSM A5C21 0150 0093 C fxd cer 0 01 uF 80 20 100 vdew TA obd A5C22 0180 1737 C fxd Al elect 2600 uF 75 10 2 5 vdew 34D268G2R5F P4 DSB A5C23 0180 0197 C fxd Ta elect 2 2 uF 10 20 vdcw 150D225X9020A2 DYS A5C24 0180 0064 C fxd Al elect 35 uF 75 10 6 vdew 30D356G006BB2 DSM A5C25 0180 0224 C fxd Al elect 10 uF 75 10 15 vdew 30D106G015A2 DSM A5C26 0180 0045 C fxd Al elect 20 uF 75 10 25 vdew 30D206G025CB2 DSM A5C27 0160 0157 C fxd my 0 0047 uF 10 200 vdcw 192P47292 PTS A5C28 0180 0224 C fxd Al elect 10 uF 75 10 15 vdew 30D106G015A2 DSM A5C29 0160 0179 fxd mica 33 pF 5 RDM15E330 3S A5C30 0150 0093 fxd cer 0 01 LF 80 20 100 vdew TA obd Model 333A 334A Section VI Table 6 1 Replaceable Parts Cont d REFERENCE hp DESIGNATOR PART NO te DESCRIPTION MER MFR PART NO
56. A METER RANGE switch setting as necessary to maintain on scale meter indication Observe wave analyzer meter and reduce wave analyzer range setting as necessary to maintain on scale meter indication NOTE The 333A 334A OUTPUT is a 0 to O 1 volt signal proportional to meter deflection regardless of METER RANGE setting Each decrease of the METER RANGE setting represents 10 dB funda mental rejection therefore the total fundamental rejection is the sum of the 333A 334A METER RANGE setting and the wave analyzer reading The 333A 334A METER RANGE setting plus the wave analyzer reading should total more than 80 dB Repeat steps b through j with 333A 334A and test equipment frequencies set to 5 kHz 50 kHz 250 kHz and 600 kHz SECOND HARMONIC ACCURACY CHECK Connect test oscillator 5060 output termi nated in 508 load to 333A 334A Set 3334 3344 controls as follows FUNCTION SET LEVEL METER RANGE ODB MODE MANUAL FREQUENCY RANGE XI Frequency Dial 15 6000 FEED THRU TERMINATION hp 11095A TEST OSCILLATOR hp 652A 3334 8 145G d e Table 5 3 333A 334A FREQUENCY Section V Set test oscillator frequency to 15 Hz at an amplitude of 1 voit Adjust 333A 334A SENSITIVITY controls for OdB indication on meter Set 333A 334A FUNCTION switch to DIS TORTION Stepdown METER RANGE switch while adjusting frequency
57. A2 DYS 6 13 Section VI Model 333A 334A Table 6 1 Replaceable Parts Cont d REFERENCE hp DESIGNA TOR PART NO Ws DESCRIPTION MPR MFR PART NO 0180 1735 0160 0162 0160 0154 0140 0083 0150 0015 0698 8686 0757 0872 0727 0853 0698 3544 0698 3418 0698 3535 0698 4424 0698 8686 0757 0872 0727 0853 0698 3544 0698 3418 0698 3535 0698 4424 3101 0036 3101 1609 3101 0110 3100 1716 3101 0889 9100 1316 H8949u 8120 1348 0400 0111 00331 61603 00331 61604 00331 61605 00333 61603 00333 61602 00333 61601 1400 0043 1400 0084 00333 90006 00332 00601 5040 0702 0340 0089 0403 0150 00332 61603 1250 1414 8120 0789 150D224X9035A2 DYS 192P22392 PTS 192P22292 PTS RCM15E221J Type G fxd Ta elect 0 22 uF 10 35 vdew xd my 0 022 uF 10 200 vdew C fxd my 0 0022 uF 10 200 vdcw C fxd mica 220 pF 5 fxd TI 2 2 MMF 10 500 vdcw R fxd carbon flm 28 8 MN 1 2 W R fxd met fim 1 3 MQ 1 1 2 W R fxd carbon fim 2 61 MQ 1 1 2 W R fxd met fim 255 kQ 1 1 2 W Part of Frequency Range switch assembly not separately replaceable MF7C 1 2 To 1304 DCS 1 2 obd CEC T O obd Ae DD DI BO p fond A pd R fxd met flm 26 1 kQ 1 1 2 W CEC T O obd Part of Frequency Range switch assembly not separ
58. A6 board 5 48 PHOTORESISTOR ADJUSTMENT a C f NOTE If the photoresistors are adjusted perform the Bridge Balance Adjust ment Paragraph 5 30 Turn 333A 334A off and set MODE to MAN UAL and FREQUENCY to X1K Disconnect all wires to A6 board except to pins 6 7 and 8 lamp drive voltage connections Remove A6 board mounting screw access to mounting screw is through hole in A3 board Remove screw which holds plastic cover to A6 board and remove plastic cover Adjust resistance of photoresistors by re positioning individual photoresistor around light source If resistance is low move photoresistor away from light source if resistance is high move photoresistor closer to light source After repositioning a photo resistor replace plastic cover on A6 boards so that photoresistor is not affected by out side light Then measure resistance of photoresistor If an individual photoresistor cannot be ad justed within tolerance replace the photo resistor After adjusting photoresistors replace screw securing plastic cover to A6 board andreplace A6 mounting screw Reconnect wires to Ap board See Figure 7 1 for wire color code diagram of A6 board 5 15 Section V 5 49 SERVICING ETCHED CIRCUIT BOARDS 5 50 The Model 333A has six etched circuit boards and the Model 334A has seven Use caution when re moving them to avoid damaging mounted components The hp part number for the assembly is
59. ALLATION 2 14 The Model 333A 334A may be rack mounted by using the 5 RackMount Kit hp Part No 5060 0775 Instructions for the conversion are included with the kit The rack mount for the Model 333A 334A is an EIA standard width of 19 inches When mounted in a rack using the rack mount kit additional support at the rear of the instrument should be provided if vibra tion or similar stress is likely 2 15 REPACKAGING FOR SHIPMENT 2 16 The following paragraphs contain a general guide for repackaging of the instrument for shipment Refer to Paragraph 2 17 if the original container is to be used 2 18 if it is not If you have any questions con tact your local hp Sales and Service Office See Appendix B for office locations NOTE If the instrument is to be shipped to Hewlett Packard for service or repair attacha tag to the instrument identify ing the owner and indicate the service or repair to be accomplished Include the model number and full serial num ber of the instrument In any corres pondence identify the instrument by model number serial number and serial number prefix 2 17 If original container is to be used proceed as follows a Place instrument in original container if avail able If original container is not available a suitable one can be purchased from your nearest hp Sales and Service Office b Ensure that container is well sealed with strong tape or metal bands 2 18 I
60. D acano OPERATING AND SERVICE MANUAL MODEL 333A 334A DISTORTION ANALYZER Serial Numbers 333A 1137403146 and greater 334A 1140A05641 and greater Appendix C Manual Backdating Changes adapts this manual to lower serial numbers To help minimize the possibility of electrical fire or shock hazards do not expose this instrument to rain or excessive moisture Manual Part No 00333 90008 Microfiche Part No 00333 90058 Copyright Hewlett Packard Company 1966 P O Box 301 Loveland Colorado 80537 U S A Reproduced with Permission Courtesy of Agilent Technologies Inc Printed October 1975 1985 D Packaro CERTIFICATION Hewlett Packard Company certifies that this product met its published specifications at the time of shipment from the factory Hewlett Packard further certifies that its calibration measurements are traceable to the United States Na tional Bureau of Standards to the extent allowed by the Bureau s calibration facility and to the calibration facilities of other International Standards Organization members WARRANTY This Hewlett Packard product is warranted against defects in material and workmanship for a period of one year from date of shipment except that in the case of certain components listed in Section I of this manual the warranty shall be for the specified period During the warranty period Hewlett Packard Company will at its option either repair or replace products which prove to be d
61. Hz 3 19 MANUAL MODE a Turn instrument on and mechanically zero meter according to procedure in Paragraphs 3 15 and 3 16 C f ge l m Model 333A 334A Set NORM R F DET switch to NORM Set FUNCTION switch to SET LEVEL Set MODE switch to MANUAL If fundamental frequency is 1 kHz or greater set HIGH PASS FILTER switch to IN Set SENSITIVITY selector to MIN position and rotate VERNIER control maximum counterclockwise NOTE The bandwidth of the SENSI TIVITY selector is reduced in the two extreme CCW positions positions used with an input signal greater than 30 V Set METER RANGE switch to SET LEVEL and set BALANCE COARSE and FINE con trols to center position Connect signalto be measuredto 333A 334A INPUT terminals REMOVE SHORTING STRAP BETWEEN FRAME GROUND 4 AND CHASSIS GROUND TERMINALSON FRONT PANEL INPUT TERMINALS WHEN MEASURING DISTORTION BETWEEN TWO POINTS WHICH ARE DC OFFSET FROM GROUND POTENTIAL Set SENSITIVITY selector to obtain meter indication greater than 1 3 full scale Adjust SENSITIVITY VERNIER for full scale meter indication if making distortion measure ment in percent if making distortion measure ment in dB adjust SENSITIVITY VERNIER for 0 dB meter indication NOTE If unable to adjust for full scale or OdB indication which indicates input signal is below 0 3 volts set METER RANGE selector down scale Use this new setting as the 100 or
62. ICATES THE N ESIGNATO OWER TRIP 924 DENOTES WHT RED YEL WIRE PARTIAL REFERENCE DESIGNATIONS ARE SHOWN PREFIX WITH ASSEMBLY OR SUBASSEMBLY DESIGNATION S OR BOTH FOR COMPLETE DESIGNATION STD B 2192 7 1 Section VII Model 333A 334A GENERAL SCHEMATIC NOTES 1 PARTIAL REFERENCE DESIGNATIONS ARE SHOWN PREFIX WITH ASSEMBLY OR SUBASSEMBLY DESIGNATION S OR BOTH FOR COMPLETE DESIGNATION 2 COMPONENT VALUES ARE SHOWN AS FOLLOWS UNLESS OTHER WISE NOTED RESISTANCE IN OHMS CAPACITANCE IN MICROFARADS DENOTES FRAME GROUND DENOTES EARTH GROUND DENOTES CHASSIS GROUND FLOATABLE DENOTES CIRCUIT GROUND ON BOARD o u o lt lt DENOTES ASSEMBLY gt DENOTES MAIN SIGNAL PATH DENOTES FEEDBACK PATH 10 ____ DENOTES FRONT PANEL MARKING 11 DENOTES REAR PANEL MARKING 12 WEBS DENOTES SCREWDRIVER ADJUST 13 C DENOTES FRONT PANEL CONTROL 14 3 AVERAGE VALUE SHOWN OPTIMUM VALUE SELECTED AT FACTORY 15 7 77 7777 DENOTES COMPONENTS NOT MOUNTED ON ASSEMBLY 16 DENOTES TROUBLESHOOTING INFORMATION LOCATED ON APRON PAGE OF RESPECTIVE SCHEMATIC 17 t DENOTES DC VOLTAGE THAT MUST BE MEASURED WITH 10 MQ 10 pF IMPEDANCE PROBE TO PREVENT OSCILLATIONS O DENOTES SIGNAL CONNECTION 1 DENOTES SCHEMATIC ON WHICH SIGNAL CONNECTION IS MADE 7 2 Model 333A 334A Section VII O OD 1 Co wh Oe O 3334 3344 C 0370A Figure 7 1 Intern
63. LT METER C Set voltmeter calibrator for 400 Hz rms output d Check 333A 334A voltmeter full scale read ing on all ranges against appropriate rms input from voltmeter calibrator Voltmeter accuracy should be within 2 e Disconnect voltmeter calibrator f Connect 500 output of test oscillator term inated in 509 to 333A 334A g Set 333A 334A METER RANGE switch to 3 VOLTS DISTORTION ANALYZER hp 333A 334A 500 FEED THRU TERMINATION hp 110488 33534 8 1466 Figure 5 1 Voltmeter Accuracy and Frequency Response Check 5 1 Section V Model 333A 334A Table 5 2 Voltmeter Frequency Response Check 3V RANGE 0 0003V RANGE METER INDICATION METER INDICATION MIN MAX MIN MAX h Set test oscillator to 400 Hz and adjust 5 10 FUNDAMENTAL REJECTION CHECK amplitude until 333A 334A meter indication is 3V Set reference on meter of test oscil a Connect test equipment to 333A 334A as lator and use amplitude control to maintain shown in Figure 5 2 Set filter pass fre set reference whenever frequency of oscil quency to 500 Hz lator is varied NOTE i Set test oscillator to each frequency listed in The test oscillator output is filtered Table 5 2 At each respective frequency so that the input to the 333A 334A 333A 334A meter reading should be within tolerances listed in table is a pure ac signal j Set 333A 334A METER RANGE switch to b Set 333A 334A controls as follows 0 0003 VOLTS FUNCTI
64. Mass General Electric Co Miniature Lamp Dept Cleveland Ohio Mel Rain Indianapolis Ind Babcock Relays D v Costa Mesa Cal Electronic Enclosures Inc Los Angeles Calif Texas Capacitor Co Houston Texas Tech Ind Inc Atohm Elect ica oe ZE Burbank Cal Electro Assemblies Inc Chicago NI C K Components Inc Newton Mass Mallory Battery Co of Canada Ltd Toronto Ontario Canada Pennsylvania Florocarbon Clifton Heights Penn Burndy COPD Norwalk Conn General Transistor Western d RR ee ta a Los Angeles Cai TISTAL Ine 64 46 e pareti Berkeley Cal Niagara Falls N Y pen 8 e Code No 11236 11237 11242 11312 11314 11453 11534 11711 11717 11870 12136 12361 12574 12697 12728 12859 12881 12930 12954 13019 13061 13103 13327 13396 13835 14099 14193 14298 14433 14493 14655 14674 14752 14960 15106 15203 15287 15291 15558 15586 15631 15772 15801 15818 16037 16179 18352 16354 16585 16688 16758 17109 17474 17675 17745 17856 17870 18042 18083 18324 18476 18486 18565 18583 18612 18873 18911 19315 19500 19589 Alpha Manufacturer Address CTS of Berne Inc Berne Ind Chicago Telephone of California Inc Pasadena A Bay State Electronica Corp Waltham Masa Teledyne Inc e ECKE Palo Alto Cal National Seal
65. Milwaukee Wis The Bendix Corp Navigation amp Control Div Teterboro N J Thomas A Edison Industries West Orange N J Div of McGraw Edison Baldwin Park Cal Concoa 4 From Handbook Supplements H4 1 Dated January 1970 Model 333A 334A Code No 19644 19701 20183 21226 Manufacturer peu A Horseheads N Y Independence Kansas Philadelphia Pa Long Island City N Y LRC Electronics Electra Mfg Co General Atronics Corp Executone Inc e a s orf e 21355 Fafnir Bearing Co The New Britian Conn 21520 Fansteel Metallurgical Corp N Chicago Ni 23020 General Reed Co Metuchen N J 23042 Texscan Corp Indianapolis Ind 23783 British Radio Electronics Ltd Washington DC 24455 G E Lamp Division Nela Park Cleveland Ohio 24655 General Radio Co West Concord Mass 24681 Memcor Inc Comp Div Huntington Ind 26365 Gries Reproducer Corp New Rochelle N Y 26462 Grobert File Co of America inc Caristadt N J 26851 Compac Hollister Co Hollister Cal 26992 Hamilton Watch Co Lancaster Pa 28480 Hewlett Packard Co Palo Alto Cal 28520 Heyman Mfg Co Kenilworth N J 30817 Instrument Specialties Co Ine oon RE CR ee e Little Falls N J 33173 G E Receiving Tube Dept Owensboro Ky 35434 Lectrohm Inc Chicago Dl 36196 Stanwyck Coil Prod
66. NGE When working on these switches observe the following rules a Use a low heat 25 to 50 watts small tip soldering iron and a small diameter rosin core solder b When replacing components attemptto dress them as nearly to their original alignment as possible c Cleanexcessive flux from the connection and adjoining area d After cleaning the switch apply a light coat of lubriplate to the switch detent balls DO NOT apply lubricant to the switch contacts or allow lubricant to contaminate components 9 54 ISOLATING THE IMPEDANCE CONVERTER 9 55 A problem can be isolated to the Impedance Converter by making two distortion measurements with the SENSITIVITY control in two adjacent posi tions and the VERNIER control adjusted to compen sate for this If the meter reading differs by more than 3 dB between the two positions of the SENSITI VITY control and the lower reading is in the more counterclockwise position then the Impedance Con verter is attenuating higher level signals A possi ble interference with this test may ceme from the automatic mode circuitry Disconnect power supply pins 4 and 5 on A5 assembly to disable the automatic mode circuitry for this test PERFORMANCE CHECK TEST CARD Hewlett Packard Model 333A 334A Test performed by Distortion Analyzer Date Serial No DESCRIPTION CHECK 1 Voltmeter Accuracy and Frequency Response Check Accuracy Check 0003 V 294 LV 7 0
67. O Figure 4 7 Bandwidth Versus Null Depth Model 333A 334A becomes abnormally large during anoverload A2CR8 breaks down and provides a lower resistance charg ing path for A2C15 which reduces the transient re covery time of the meter amplifier Negative ac feed back is applied from the collector circuit of A2Q9 to the emitter circuit of A2Q5 This feedback is used to ensure flat frequency response to improve linear ity and to reduce the effect of variationof transistor parameters with environmental changes In this manner the calibration of the instrument is made dependent on high quality passive components 4 47 METER RECTIFIER CIRCUIT 4 48 The meter rectifier is connected in a bridge type configuration with a diode in each upper branch and a de milliammeter connectedacross the midpoints of the bridge The simplified meter rectifier is illus trated in Figure 4 8 The generator represented by A2Q5 through A2Q9 with the internal impedance provides the meter M1 with current for full scale deflection and develops a voltage across the calibra tion network which closes the ac feedback loop Capacitors A2C27 and A2C28 are used as coupling capacitors for the ac feedback loop output signal to the OUTPUT connector and the bridge error signal to the input of the automatic fine tuning loops The mechanical inertia of the meter and A2C26 prevents the meter from responding to individual current pulses Therefore the meter indicatio
68. OLLECT R COLLECTOR OF Q3 AA Q2 CS C6 TP2 COLLECTOR CIRCUIT Q9 3534 3544 808 Auto Control Loop Detector Figure 4 4 4 3 Section IV 4 33 Refer to Figure 4 5 for the phase relationship of the bridge error signal andreference voltage at the base of A3Q4 The shaded portions of the error sig nals b and c indicate that part of the error signal which contributes to the dc lamp control voltage As indicatedind any error signal that is 909 out of phase with the reference does not affect the dc lamp control voltage because equal amounts of the positive and negative portions are passed 4 34 The operation of the reactive branch control loop is similar to that of the resistive branch The 45 138 225 318 90 D 2709 360 Ref signal for Resistive Detector A5Q4 Resistive Error signal in phase with reference at bridge Resistive Error signal 180 out of phase Reactive Error signal 90 out of phase Results in no output from Re sistive Detector Error signal reactive leg detuned resistive leg unbalanced 3334 33 44 RO Model 333A 334 phase delay circuit A5Q15 A5Q16 S4AF and S4C1 through S4C5 shifts the reference voltag 909 as shown in Figure 4 5f This makes the detector A5Q12 sensitive to components of the bridge error signal that are 900 out of phase g and h The outpu of the lamp driver A5Q14 controls the brilliance of A6DS2 which varies the resistance of A6
69. ON VOLTMETER METER RANGE 1VOLT MODE MANUAL k Set test oscillator to 400 Hz and adjust amp FREQUENCY RANGE X100 litude until 333A 334A meter indication is Frequency Dial 5 300 uV Set a reference on meter of test oscillator and use amplitude control to main tain set reference whenever frequency of c Set test oscillator frequency to 500 Hz and oscillator is varied adjust amplitude for indication of 1 0 volt on meter of 333A 334A L Set test oscillator to each frequency listed d Set 333A 334A FUNCTION switch to SET in Table 5 4 At each respective frequency LEVEL and set METER RANGE to 0 3 V 333A 334A meter reading should be within Adjust SENSITIVITY controls for 0dB indi tolerances listed in table cation on 333A 334A meter WAVE ANALYZER FILTER SET DISTORTION ANALYZER WHITE 2640 hp 333A 334A i Ge A va vo Dra USE SEPARATE LEADS LESS THAN 12 LONG 6000 FEED THRU TERMINATION hp 11095A n4 ke 3334 8 1465 Figure 5 2 Fundamental Rejection Check 5 2 Model 3334 334A 5 11 a b Adjust wave analyzer controls for maximum reading approximately 500 Hz and use as OdB reference Set 333A 334A FUNCTION switch to DIS TORTION Adjust 333A 334A frequency dial vernier and BALANCE controlsfor minimum meter indi cation When meter indication is less than 10 of SET LEVEL indication set MODE switch to AUTOMATIC Reduce 333A 334
70. Response Check 5 6 6 1 Replaceable Parts oe ee ee 8 6 LIST OF ILLUSTRATIONS Number Page Number Page 1 1 Model 333A Distortion Analyzer 1 1 3 1 Front and Rear Panel Description 3 0 9 4 Capacitance Check o 5 5 3 2 Manual Nulling Test Setup 3 5 9 5 DC Isolation Check wk oye oe 2050 3 3 Impedance Correction Graph 3 5 5 6 Voltmeter Accuracy and Frequency 4 1 Block Diagram 4 0 Response Check 5 7 4 2 Bridge Waveforms s 4 2 5 7 Shielded Load Assembly 5 8 4 3 Wien Bridge Circuit and Rejection 5 8 Adjustment and Chassis Mounted Characteristics 4 3 Component Location e 5 9 di EE o ai A 4 5 Reference and Error Phase 6 3 Frequency Tuning Assembly 6 5 Relationship 4 4 7 1 Internal Wiring Data a q 3 7 4 4 6 Rejection Amplifier Block Diagram and 7 2 Impedance Converter P 0 A2 and RF Typical Frequency Rejection Detector A4 7 5 7 6 Characteristic 7 3 Rejection Amplifier A3 Bridge Balance 4 5 Bandwidth Versus Null Depth 4 6 P O A6 and High Pass Filter AT 7 7 7 8 Simplified Metering Circuit 4 7 7 4 Meter Amplifier P O A2 7 9 7 10 5 1 5 2 5 3 Fundamental Rejection Check 7 5 Control Circuit A5 and Bridge Instrument Induced Distortion Check Balance P O A6 7 11 7 12 Frequency Calibration Accuracy Chec
71. TER RANGE switch respectively to SET LEVEL Then set FUNCTION switchto DISTORTION Adjust 333A 334A frequency dial vernier and BALANCE controls for meter indication of less than 10 of set level 2 dB Set 333A 334A MODE switch to AUTOMATIC Reduce METER RANGE setting as necessary to maintain on scale meter reading Meter reading should be within 1 5 dB 0dB of manually nulled reading obtained in step o Repeat steps k through r with 333A 334A and test oscillator frequency set to 5 kHz 50 kHz and 500 kHz 5 15 INPUT IMPEDANCE CHECK 5 16 RESISTANCE CHECK a C e Connect 509 output of test oscillator term inated in 500 load to 333A 334A INPUT terminals Set 333A 334A controls as follows FUNCTION VOLTMETER SENSITIVITY MAX SENSITIVITY VERNIER MAX METER RANGE 1 VOLT 4 e Set test oscillator frequency to 100 Hz and adjust amplitude for indication of 1 volt on 333A 334A meter Connect a 100 kQ resistor in series with 333A 334A input 333A 334A meter indication should be between 0 85 V and 0 95 V This verifies an input resistance of 1 MS 5 in voltmeter function Remove 100 kQ resistor and reconnect oscillator to 333A 334A Set 333A 334A FUNCTION switch to SET LEVEL and set METER RANGE switch to 0 1 VOLT Adjust 333A 334A SENSITIVITY controls for meter indication of 0 1 V 9 5 Section V i Connect 100 kQ resistor in series
72. V2 through A6V5 to tune the branches of the reactive leg Deck AR of the FREQUENCY RANGE switch S4 switches A5R56 in parallel with A5R55 on the top three fre quency ranges A6DS2 will become brighter andlower the resistance of A6V2 through A6V5 making variatio f Ref signal for Reactive Detector A5Q 12 Reactive Error signal in phase with reference at bridge Reactive Error signal out of phase Registive Error signal 90 out of phase Results in no output from Re active Detector Error signal Reactive leg detuned Resistive leg unbalanced Figure 4 5 Reference and Error Phase Relationship 4 4 Model 333A 334A BRIDGE IN PREAMPLIFIER A3QI AMPLIFIER A3Q3 NEGATIVE FEEDBACK 333A 334A RO Section IV a o z 4 2 w We m a 4 FREQUENCY Figure 4 6 Rejection Amplifier Block Diagram and Typical Frequency Rejection Characteristic in resistance less than on the two lower ranges How ever less variation in resistance is needed to tune the leg because the impedance in the reactive leg becomes progressively less as the higher frequency ranges are Selected 4 35 Any error signal that is not an integral multiple of 909 is the result of the reactive leg of the bridge being detuned andthe resistive leg being unbalanced For example an error signal that is 450 out of phase Figure 4 5e and j will result in outputs from both resistive and reactive detectors to tune the bridge and
73. X10 through X10K manual null tuned to less than 10 of set level total frequency hold in 1 about true manual null AUTOMATIC NULL ACCURACY 5 Hz to 100 Hz Meter reading within 0 to 3 dB of manual null 100 Hz to 600 kHz Meter reading within 0 to 1 5 dB of manual null HIGH DASS FILTER 3 dB point at 400 Hz with 18 dB per octave roll off 60 Hz rejection gt 40 dB Normally used only with fundamental frequencies greater than 1 kHz POWER SUPPLY 100 V 120 V 220 V 240 V 5 10 48 66 Hz approximately 4 watts 1 6 MHz to 65 MHz Distortion introduced by detector is 1 for 3 to 8 volts rms carriers modulated 30 NOTE Distortion measurement at carrier levels as low as 1 volt may be made with reduced accuracy OPTION 01 Indicating meter has VU characteristics con forming to FCC Requirements for AM FM and TV broadcasting Model 333A 334A Section D SECTION Il INSTALLATION 2 1 INTRODUCTION 2 2 This section contains information and instruc tions necessary for the installation and shipping of the Models 333A 334A Distortion Analyzers Included are initial inspection procedures power and grounding requirements installation information and instruc tions for repackaging for shipment 2 3 INSPECTION 2 4 This instrument was carefully inspected both mechanically and electrically before shipment It should be physically free of mars or scratches and in perfect electrical order upon r
74. acteristics gt 80 dB the low level of instrument induced distor tion and the meter accuracy of these instruments re sult in highly accurate measurement of low level har monic distortion 3 3 Anrms calibrated voltmeter is inherent in the 333A and 334A The voltmeter provides a full scale sensitivity of 300 u volts rms residual noise lt 25u volts The voltmeter frequency range is from 5 Hz to 3 MHz except on the 0 0003 volt range which is from 20 Hz to 500 kHz 3 4 CONTROLS AND INDICATORS 3 5 Figure 3 1 illustrates and describes the function of all front and rear panel controls connectors and indicators The description of each component is keyed to the drawing included within the figure 3 6 GENERAL OPERATING INFORMATION 3 7 INPUT CONNECTIONS 3 8 The input signal can be connected to the 333A and 334A through twisted pair leads or a shielded cable with banana plug connectors Keep all test leads as short as possible to avoid extraneous pickup from stray ac fields When measuring Low level signals ground loops may occur causing erroneous readings Ground loops may be avoided by connecting the 333A 334A Distortion Analyzer to an appropriate isolation transformer to break the chassis ground from power supply ground Connect all other instruments to one power strip with the three prong connectors as close as possible 3 9 VOLTMETER CHARACTERISTICS 3 10 The RMS VOLTS markings on the meter face are basedonthe
75. adley Co Los Angeles Cal Erie Technological Products Inc Erie Pa Hansen Mfg Co Inc Princeton Ind H M Harper Co Chicago NI Helipot Div of Beckman Inst inc RP a OEC ENTERS Fullerton Cal Hughes Products Division of Hughes Aircraft Co Newport Beach Cal Amperex Elect Co Hicksville L I N Y Bradley Semiconductor Corp A oc New Haven Conn Carling Electric Inc Hartford Conn Circle F Mfg C0 Trenton N J George K Garrett Co Div MSL Industries Inc Philadelphia Pa Federal Screw Products Inc Chicago NI Fischer Special Mfg Co Cincinnati Ohio General Industries Co The Elyria Ohio Goshen Stamping amp Tool Co Goshen Ind JFD Electronics Corp Brooklyn N Y Jennings Radio Mfg Corp San Jose Cal Groove Pin Corp Ridgefield N J Signalite Inc Neptune N J J H Winns and Sons Winchester Mass Industrial Condenser Corp Chicago fit R F Products Division of Amphenol Borg Electronic Corp EN UE Je ZNP oaa Danbury Conn E F Johnson Co Waseca Minn International Resistance Co Philadelphia Pa Keystone Carbon Co Inc St Marys Pa CTS Knights Inc Sandwich Ill Kulka Electric Corp Mt Vernon N Y Lenz Electric Mfg Co Chicago Ill Littlefuse Inc Des Plaines Il Lord Mfg Co
76. afety hazard KEEP AWAY FROM LIVE CIRCUITS Operating personnel must not remove instrument covers Component replacement and internal adjustments must be made by qualified maintenance personnel Do not replace components with power cable connected Under certain conditions dangerous voltages may exist even with the power cable removed To avoid injuries always disconnect power and discharge circuits before touching them DO NOT SERVICE OR ADJUST ALONE Do not attempt internal service or adjustment unless another person capable of rendering first aid and resuscitation is present DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT Because of the danger of introducing additional hazards do not install substitute parts or per form any unauthorized modification to the instrument Return the instrument to a Hewlett Packard Sales and Service Office for service and repair to ensure that safety features are main tained DANGEROUS PROCEDURE WARNINGS Warnings such as the example below precede potentially dangerous procedures throughout this manual Instructions contained in the warnings must be followed Dangerous voltages capable of causing death are present in this instrument Use ex treme caution when handling testing and adjusting SAFETY SYMBOLS General Definitions of Safety Symbols Used On Equipment or In Manuals na D ez P dro TE NOTE Instruction manual symbol the product will be marked with this symbol
77. al Varian Assoc Etmac Div San Carlos Cal Kelvin Electric Co Van Nuys Cal Digitran Co Pasadena Cal Transistor Electronics Corp Minneapolis Minn Westinghouse Electric Corp Electronic Tube Div Eimira N Y Filmohm Corp New York N Y Cinch Graphik Co City of Industry Cal Silicon Transistor Corp Carle Place N Y Avnet Corp Culver City Cal Fairchild Camera amp Inst Corp Semiconductor Div Mountain View Cal Minnesota Rubber Co Minneapolis Minn Birtcher Corp The Monterey Park Cal Sylvania Elect Prod Inc Mt View Operations Mountain View Cal Technical Wire Products Y v d eis R Cranford N J Bodine Elect Co Chicago Ill Continental Device Corp Hawthorne Cal Raytheon Mfg Co Semi conductor Div Mountain View Cal Hewlett Packard Co New Jersey Division Rockaway N J U S Engineering Co Los Angeles Cal Blinn Delbert Co Pomona Cal Burgess Battery C0 ES EEE ETE Niagara Falls Ontario Canada Deutsch Fastener Corp Los Angeles Cal Bristol Co TM Waterbury Conn Sloan Company Sun Valley Cal ITT Cannon Electric Ine Phoenix Div Phoenix Arizona National Radio Lab Inc Paramus N J CBS Electronics Semiconductor Operations Div of CBS Inc Lowell
78. al Wiring Data 7 3 7 4 BACKDATING INFORMATION NOTE 1 A2R3 R20 R39 are different in some earlier instruments and are not directly interchangeable with the ones listed in Table 6 1 See Appendix C Change 11 for applicable numbers NOTE 2 The A2 Component locator for earlier instruments is shown below It applies to the following instruments and serial numbers 333A 1101402085 and below 334A 1106403240 and below Also applies to Option 01 SEE NOTE 1 1 i nre x e x ip I i ds ud R Tr 1 I J o AO SEE NOTE 1 SEE NOTE 1 R i R32 C29 R30 C22 o 3344 B 1446C A2 hp Part No 00333 66502 6 92 8 VECE c9 ci2 RI2 Rl6 amp RiI RI7 C24 3 R42 9 R37 R22 CI6 R23 R32 R35 W I O C23 R30 C22 O 334A B 1448 A4 hp Part No 00332 66502 asi dg hp Part No 00333 66512 TROUBLESHOOTING INFORMATION 1 mV rms between pin 1 and ground side of A2R12 for full scale meter deflection in VOLTMETER function on 1 V range 1 mV rms at pin 4 for full scale meter deflection in VOLTMETER function on 1 V range Use a 10 MQ 10 pF impedance probe for this measurement 7 5 SENSITIVITY Ces IOOKHz SENSITIVITY CAL 52 CI C2 C3 C4 C5 52C y 0 7 3PF S2CR 7 5 2C2 0 7 3PF 8 S2C4 0 7 3PF 10
79. arad a Me moro miilisscond BET Vl vrbe bebe field effect transistor og moynting da Sero eege 0 a ence REPRE DE EU Ea guerdied mv 5 serene Mei Gl EE germanium i E EE groundied NA nanoampere s 109 amperes NO air EW normally closed 6 3 Figures 6 1 through 6 3 illustrate the replace able mechanical parts used in the 333A 334A Mis cellaneous parts are listed at the end of Table 6 1 6 4 ORDERING INFORMATION 6 5 To obtain replacement parts address order or inquiry to your local Hewlett Packard Field Office See Appendix for list of office locations Identify parts by their Hewlett Packard part numbers Include instrument model and serial numbers 6 6 NON LISTED PARTS 6 7 To obtain a part that is not listed include a Instrument model number b Instrument serial number c Description of the part d Function and location of the part zero temperature coefficient SPOT single pole double throw EN nanosecondis 109 seconds SPST singie poie single throw RO not separately replaceable 9 t 4 V 9 9 9 9 3 9 a 9 9 amp 9 e qd 6 amp v e PEPPER i ORTO MEP Saas enn temperatura coefficient oe od 4 ee amp 9 t e 21290002 weer re 3G d wo P t 9 4 V 4 9 s t a i M MII a e a a oa t oh ew o o3 o9 te e e 9 os 9o 9 5 o8 nos 9 3 9 3 3 vo
80. at has specifications equal to or better than the re quired specifications may be used 5 5 PERFORMANCE CHECKS 5 6 The performance checks are in cabinet proce dures that can be used to verify instrument perform ance These procedures can be used for periodic maintenance to check specifications after a repair or for incoming quality control inspection Perform ance checks for both the 333A and 334A are provided The performance checks are applicable to both instru ments except where noted in paragraph heading 9 7 The performance checks are made with the ac power cord connected to nominal line voltage 100V 120V 220V 240V 48 to 66 Hz MODE SWITCH to MANUAL HIGH PASS FILTER to OUT and NORM R F DET switch to NORM unless otherwise specified VOLTMETER CALIBRATOR hp 738BR TEST OSCILLATOR hp 652A 5 8 A Performance Check Test Card is provided at the end of this section for recording the performance of the instrument duringthe performance checks The card may be removed from the manual and used as a permanent record of the incoming inspection or of a routine performance check If the instrument fails to meet any of its specifications perform the Adjust ment and Calibration Procedures Paragraph 5 23 5 9 VOLTMETER ACCURACY AND FREQUENCY RESPONSE CHECK amp Connect voltmeter calibrator to 333A 334A as shown in Figure 5 1 Test oscillator will be used later in check b Set 333A 334A FUNCTION switch to VO
81. ately replaceable R fxd met flm 1 65 kQ 1 1 2 W R fxd fin 1 40 kN 1 1 8 W R fxd carbon fim 28 8 MQ 1 2 W R fxd met flm 1 3 MN 1 1 2 W R fxd carbon fim 2 61 MQ 1 1 2 W CEC T O obd CEC T O obd MF7C1 2 T0 1304 F DCS 1 2 obd R fxd met flm 255 kQ 1 1 2 W CEC T O obd Part of Frequency Range switch assembly not separately replaceable R fxd met flm 26 1 kR 1 1 2 W Part of Frequency Range switch assembly not separately replaceable R fxd met flm 1 65 kN 1 1 2 W R fxd fim 1 40 KQ 1 1 8 W Part of Frequency Range switch assembly not separately replaceable CEC T O obd CEC T O CEC T O Switch toggle AC power spst 8928K61 Switch slide 2 DPDT 1 5A 250 VAC 11E 1036 Switch slide DPDT 334A only 11A 1039A Switch position lever Type 187 obd Switch slide DPDT Transformer power Assembly cable power cord set KH 4147 MISCELLANEOUS SB 437 5 Bushing nylon black plastic Cable A Cable B Cable or Cable control Cable filter Cable main Clip Fahnstock brass Holder Fuse F1 extractor post type Manual operating and service 146 342014 Shield Power A Washer shoulder Insulator binding post Guides P C board grey Cable Assembly Consisting of Connector RF TRAXL FEM SGL HOLE RR Coaxial Cable 50 2
82. be attenuated to set level reference The minimum measurable distortion for floating operation on the X1 frequency range is 50dB below the fundamental DC ISOLATION Signal ground may be 400 Vdc from external chassis VOLTMETER RANGE 300 u V to 300 V rms full scale 13 ranges 10 dB per range VOLTMETER FREQUENCY RANGE 5 Hz to 3 MHz 300 uV range 20 Hz 500 kHz VOLTMETER ACCURACY 30 Hz 300 kHz 10 Hz 1 MHz 20 Hz 500 kHz 5 Hz 3 MHz 5 Hz 500 kHz 1 mV 30 V 100 V 300 V 10 Hz 300 kHz MODEL 334A Same as Model 333A except as indicated below AM DETECTOR High impedance dc restoring peak detector with semi conductor diode operates from 550kHz to greater than 65 MHz Broadband input Maximum input 40 V p p ac or 40 V peak transient CARRIER FREQUENCY 550kHzto 1 6 MHz Distortion introduced by detector is 0 3 for 3 to 8 volt carriers modulated 30 Model 333A 334A Specifications Cont d NOISE MEASUREMENTS Voltmeter residual noise on the 300 uV range lt 25 LV rms terminated in shielded 6002 lt 30 LV rms terminated in shielded 100 KR OUTPUT For input frequencies from 20 Hz to 600 kHz 0 1 V rms 0 01 V open circuit for full scale meter deflection 0 05 V rms 0 005 V into 2 kN for full scale meter deflection AUTOMATIC NULLING MODE Set Level At least 0 2 V rms Frequency Ranges X1 manual null tuned to less than 3 of set level total frequency hold in 0 5 about true manual null
83. d Co Inc Boston Mass Dimco Gray Co Dayton Ohio International Inst Inc Orange Conn Grayhill Co LaGrange Il Triad Transformer Corp Venice Cal Winchester Elec Div Litton Ind Inc Oakville Conn Military Specification V SCR ECC IE ai kd International Rectifier Corp El Segundo Cal Airpax Electronics Inc Cambridge Maryland Barry Controls Div Barry Wright Corp A AR A Watertown Mass Carter Precision Electric Co Skokie Hi Sperti Faraday Inc Copper Hewitt Electric Div Hoboken N J Electric Regulator Corp Norwalk Conn Jeffers Electronics Division of Speer Carbon Co Fairchild Camera amp Inst Corp Space amp Defense Systema Div Paramus N J Magurie Industries Inc Greenwich Conn Sylvania Electric Prod Inc eor 39 P9 0934 9 c5 dre b ow EE Electronic Tube Division Emporium Pa Astron Corp East Newark Harrison N J Switcheraft Inc Chicago M Metals Controls Inc Spencer Products Attleboro Mass Phillips Advance Control Co Joliet NI Research Products Corp Madison Wis Rolton Mfg Co Inc Woodstock N Y Vector Electronic Co Glendale Cal Carr Fastener Co Cambridge Mass New Hampshire Ball Bearing Inc Peterborough N H General Instrument Corp Capacitor Div Darlington S C ITT Wire and Cable D
84. djust 333A 334A SENSITIVITY controls for meter indication of OdB e Settest oscillator to 1 kHz Reading on 333A 334A meter should be within 0 5 dB of 0 dB setting g Set test oscillator to 60 Hz h Reading on 333A 334A meter should be at least 40 dB below 0 dB setting 5 21 RESIDUAL NOISE CHECK a Connect a shielded 6002 load across 333A 334A INPUT terminals See Figure 5 7 for details on constructing shielded load Be sure that shorting bar is connected be tween chassis ground and circuit ground on INPUT terminals b Set 333A 334A controls as follows FUNCTION VOLTMETER METER RANGE 0 0003 VOLTS c Meter should indicate less than 25 uV d Remove 6002 load Connect a shielded 100 kQ load across INPUT terminals See Figure 5 7 for details on constructing shielded load e Meter should indicate less than 30 LV 5 22 AM DETECTOR CHECK Model 334A only a Connect high frequency signal generator 502 RF output to 334A R F INPUT terminal b Set 334A controls as follows FUNCTION 0 SET LEVEL NORM R F DET R F DET METER RANGE SET LEVEL MODE 1 o o MANUAL FREQUENCY RANGE X100 Frequency Dial 10 5 7 Section V STD 8 0089 Model 333A 334 ES Description 1251 0174 1251 0175 0360 0042 0758 0053 Connector male Connector male w insulator Lug terminal 900 Resis
85. e L59100 3447 Page 6 13 Add R9 Part No 0813 0029 R fxd 1 0 Q 3 3 w Page 5 6 Under DC ISOLATION check Pagagraph d Change aaa 27 mA to No Current and 1 mA range to 10mA range 6 13 Delete R14 Part No 0686 1055 R fxd comp 1 MQ Figure 7 2 Page 7 5 7 6 Delete R14 1 MO in parallel with C2 C3 input circuit Page 6 14 Change S4R2 and S4R12 to Part No 0698 4074 1 02 ML Change S4R1 and S4R11 to Part No 0698 4075 30 0 MQ Figure 7 3 Page 7 7 7 8 Change S4R2 S4R12 to 1 02 MQ and SAR1 SAR11 to 30 0 Ma Page 1 2 Table 1 1 Delete 100 V 120 V 220 V 240 V 5 10 48 to 66 Hz approximately 4 watts Add 115 V or 230 V 10 48 to 440 Hz approximately 4 watts Terminals are provided for external battery supply Positive and negative voltages between 28 V and 50 V are required Current drain from each voltage is 40 mA Page 2 1 Paragraph 2 6 Delete 100 V 120 V 220 V 240 V 5 10 48 to 66 Hz Add 115 or 230 volts 10 at 48 440 Hz Add at the end of the paragraph The instrument can be battery operated by connect ing two 28 50 V batteries rated at 40 milliamperes to the battery terminal on the rear panel Figure 3 1 Page 3 0 Change the rear panel illustration as shown below Change Index No 21 to read Line Voltage 115 230 V switch sets instrument to op erate from 115 V or 230 V ac Add Index No 23 Battery voltage 28 to 50 V dc and 28 to 50 V dc ter
86. e SET LEVEL position a ground is applied to the Wien bridge circuit to allow a signal reference level to be set up on the meter With the FUNCTION switch in the DIS TORTION position the Wien bridge is used as an in terstage coupling network between the preamplifier and bridge amplifier The Wien bridge is then tuned and balanced to reject the fundamental frequency of the applied input signal Two automatic control loops con sisting of two phase detectors lamp drivers lamps and photocells provide fine tuning and balance in the AUTOMATIC MODE The remaining frequency com ponents are applied to the bridge amplifier and are measured as distortion by the metering circuit Nega tive feedback from the bridge amplifier to the preamp lifier narrowsthe rejectionresponse of the Wien bridge 4 7 The output of the rejection amplifier is applied to the metering circuit through the post attenuator The post attenuator is used to limit the input signal level applied to the metering circuit to 1 mV for full Scale deflection Sensitivity of the metering circuit is increased to 300 uV for full scale deflection onthe 0003 V range The metering circuit provides a visual indication of the distortion level of the input signal In addition tothe indication provided by the meter the OUTPUT terminals provide a means of monitoring the distortion components 4 8 DISTORTION MEASUREMENT IN AM CARRIERS 4 9 The Model 334A Distortion Analyzer contains a
87. eceipt To confirm this the instrument should be inspected for physical damage in transit Also checkfor supplied accessories and test the electrical performance of the instrument using the procedure outlined in Paragraph 5 5 If there is damage or deficiency see the warranty on the inside front cover of this manual 2 5 POWER REQUIREMENTS 2 6 The Model 333A 334A can be operated from any ac source of 100 V 120 V 220 V 240 V 5 10 48 66 Hz With the instrument disconnected from the ac power source move the slide located on the rear panel until the desired line voltage appears Power dissipation is approximately 4 watts 2 7 THREE CONDUCTOR POWER CABLE 2 8 To protect operating personnel the National Electrical Manufacturers Association NEMA recom mends that the instrument panel and cabinet be grounded All Hewlett Packard instruments are equipped with a three conductor power cable which when plugged in toanappropriate receptacle grounds the instrument The offset pin on the power cable three prong connec tor is the ground wire 2 9 INSTALLATION 2 10 The Model 3334 334A is fully transistorized therefore no special cooling is required However the instrument should not be erated where the am bient temperature exceeds 55 C 131 F 2 11 BENCH INSTALLATION 2 12 The Model 333A 334A is shipped with plastic feet and tilt stand in place ready for use as a bench instrument 2 13 RACK INST
88. ed in the Model 334A is a broadband dc restoring peak detector consisting of a semiconductor diode and filter circuit AM distor tion levels as low as 0 3 can be measured on a 3 V to 8 V rms carrier modulated 30 in the standard broadcast band Distortion less than 1 can be measured at the same levelofthe carrier up to 65 Mc Table 1 1 MODEL 333A DISTORTION MEASUREMENT RANGE Any fundamental frequency 5 Hz to 600 kHz Distortion levels of 0 1 100 are measured full scale in 7 ranges DISTORTION MEASUREMENT ACCURACY Harmonic measurement accuracy full scale Fundamental Input Less Than 30 V 10095 0 3 0 1 10 Hz 1 2 MHz 1 6 ACCESSORY FEATURES 1 7 The accessory available with the 333A and 334A Distortion Analyzers is a voltage divider probe hp Model No 10001A The features of the probe are a 10 megohms shunted by 10 pF giving 10 1 attenuation DC to 30 MHz bandwidth 2 division accuracy 600 V peak input 5 ns rise time o pos 1 8 OPTION 1 9 Option 01isa standard hp Model 333A or 334A with a special meter and meter amplifier compen sated to permit response to VU volume units characteristics 1 10 INSTRUMENT IDENTICATION 1 11 Hewlett Packard uses a two section serial number The first section prefix identifies a series of instruments The last section suffix identifies a particular instrument within the series If a letter is included with the serial number it iden
89. efective For warranty service or repair this product must be returned to a service facility designated by hp Buyer shall prepay shipping charges to hp and hp shall pay shipping charges to return the product to Buyer However Buyer shall pay all shipping charges duties and taxes for products returned to hp from another country Hewlett Packard warrants that its software and firmware designated by hp for use with an instrument will execute its programming instructions when properly installed on that instrument Hewlett Packard does not warrant that the operation of the instrument or software or firmware will be uninterrupted or error free LIMITATION OF WARRANTY The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer Buyer supplied software or interfacing unauthorized modification or misuse operation outside of the environmental specifications for the product or improper site preparation or maintenance NO OTHER WARRANTY IS EXPRESSED OR IMPLIED HEWLETT PACKARD SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE EXCLUSIVE REMEDIES THE REMEDIES PROVIDED HEREIN ARE BUYER S SOLE AND EXCLUSIVE REMEDIES HEWLETT PACKARD SHALL NOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSE QUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY ASSISTANCE Product maintenance agreements and other cu
90. emove top and bottom covers b Secure shorting bar between chassis ground and circuit ground INPUT terminals c Connect common lead of a dc voltmeter to either INPUT ground terminal d Perform the measurements and adjustments listed in Table 5 5 DO NOT ALLOW PROBE TO SHORT A2TP1 TO GROUND IF THIS HAPPENS A2Q4 MAY BE DE ST ROYED 5 27 VOLTMETER GAIN ADJUSTMENTS a Connect voltmeter calibrator to 333A 334A as shown in Figure 5 1 b Set Distortion Analyzer controls as follows FUNCTION VOLTMETER METER RANGE 0 001 VOLTS Table 5 5 Power Supply and Bias Adjustments MEASUREMENT VOLTAGE 25 V 0 5V 25 V 1 0 V 11 3 V 8 2 V 0 5 V 2 65 V 0 2 V 19 5 V 0 5 V Any violet wire Any red wire A2 TP1 A2 TP2 A3 TP1 A3 TP2 REGULATION line voltage between 03 5 and 126 5 VAC 25V 20 25 V 25 V 1 0V 11 3 V 40 1 V 8 2 V 0 5 V 42 05 V 19 5 V 0 2 0 5 y y Referencedto 25 volt supply 25 volt supply must be adjusted first Model 3334 334A Section V A3R4 c5 BIAS ADJ A1R13 25 V ADJ N d CAA EI ASTP4 SS NE Sel IG IT am A2R3 Se BIAS ADJ ASTP AN C9 Bii A3R16 RZ DM T TO liil n Se BIAS ADJ A2C21 A2R 39 ABTP2 A2R34 AB R5 R4 A6 CAL3MHz GAIN ADJ 400 Hz CAL SPARE DIODE A4CR1 R3 Ik Re L2 S6 R9 Li 334A ONLY MM R2 x A S2R8 F2 AND SPARE R1 S3C6 C1 PI 8 t y S3C1 L3 A
91. ent to 333A 334A as shown in Figure 5 6 REMOVE SHORTING BAR BE TWEEN CHASSIS GROUND y AND FRAME GROUND 4 ON 333A 334A INPUT TERMINALS Set 333A 334A controls as follows FUNCTION L o 0 VOLTMETER METER RANGE 1 VOLT DISTORTION ANALYZER hp 3334 3344 Capacitance Check Model 333A 334A OSCILLATOR hp204C O WARNING de SHORTING BAR ON REAR PANEL 2 MUST BE REMOVED TO GROUND TERMINAL ON REAR PANEL OF THE hp 204C WER SUPPLY D 6515A 333A 8 1470A Section V DISTORTION ANALYZER hp 333A 334A o9 VS WARNING SHORTING BAR MUST BE REMOVED DIGITAL MULTI METER hp 3465A LS 44444 J111JJJ e Figure 5 6 DC Isolation Check c Set oscillator to 1 kHz and adjust amplitude for 333A 334A meter indication of 0 9 V d Set power supply to 400 VDC 333A 334A meter indication should not change There should be approximately 0 27 mA indicated on the Multimeter s 1 mA range 5 20 HIGH PASS FILTER CHECK a Connect 509 output of test oscillator term inated in 502 load to INPUT terminals of 333A 334A b Set 333A 334A controls as follows FUNCTION SET LEVEL METER RANGE SET LEVEL HIGH PASS FILTER IN c Bet test oscillator to 5 kHz at an amplitude of 0 3 V Seta reference on meter of test oscillator and use amplitude control to maintain set reference whenever frequency of oscillator is varied d A
92. et reference whenever frequency of oscillator is varied Increase frequency of test oscillator to 230 kHz 333A 334A meter indication should be 70 7 mV or greater verifying an input capacitance of 70 pF or less on 0 1 V range in voltmeter function TEST OSCILLATOR 333A B 1469 Figure 5 5 i 9 18 ae C Model 3334 334A Set 333A 334A FUNCTION switch to SET LEVEL Set test oscillator to 100 Hz and adjust amp litude for 333A 334A meter indication of 0 1 V Set a reference on meter of test oscil lator and use amplitude control to maintain set reference whenever frequency of oscil lator is varied Increase frequency of test oscillator to 230 kHz 333A 334A meter indication should be 70 7 mV or greater verifying an input capacitance of 70 pF or less in set level and distortion functions MINIMUM INPUT LEVEL CHECK Connect 502 output of test oscillator term inated in 500 load to 333A 334A INPUT terminals Set 333A 334A controls as follows FUNCTION b 0 e 4 b 0 4 VOLTMETER SENSITIVITY MAX SENSITIVITY VERNIER MAX METER RANGE 0 3 VOLTS Set test oscillator to 400 Hz and adjust amplitude for 333A 334A meter indication of 0 3 V Set 333A 334A FUNCTION switch to SET LEVEL 333A 334A should indicate full scale or greater 9 19 DC ISOLATION CHECK a b 500 FEED THRU TERMINATION hp 110488 Set the 6515A to zero output and connect test equipm
93. f J4 to 1251 1009 Page 6 4 Change the part of the 333A rear panel to 00333 00202 and change the part of the 334A rear panel to 00334 00202 The parts in this change are not directly interchangeable unless all parts are changed Change A1R13 part to 2100 1434 Change A2R3 to part 2100 0094 Change A3R20 to part 2100 1738 Change A3R39 to part 2100 0151 The resistors in this change are not directly interchangeable with the ones listed in Table 6 1 Figure 7 3 Delete the 47 ohm resistors A3R35 and A3R36 in series with the 25 volt lines Replace the resistors with a direct connection Change the value of A3R16 to 3300 ohms and delete A3R34 Change the circuit in the vicinity of A3R37 as shown below Table 6 1 Change A3R16 to R var 3 3 kQ 10 1 8 W hp part no 2100 1435 Change A3R37 to R var 100 k9 30 1 8 W hp part no 2100 0362 Delete A3R34 A3R35 and A3R36 Page 6 3 Change 9 to 5040 0642 Page 6 4 Change to 5060 0739 Change 4 to 5060 0766 Change to 5000 0732 Change to 5000 0733 Change to 5060 0751 Change to 00334 00201 and 00333 00201 Change to 5060 0775 Page 5 8 Table 5 5 The voltage limits and regulation values for A3T P2 are changed to 20 2 V 0 3 V Page 6 9 Change A3Q4 to Part No 1855 0006 Change A3R37 to Part No 0683 4735 47 KR C 3 Appendix C CHANGE 15 CHANGE 16 CHANGE 17 CHANGE 18 C 4 Model 333A 334A e 6 12 Delet
94. f original container is not to be used proceed as follows a Wrap instrument in heavy paper or plastic be fore placing in an inner container b Place packing material around all sides of in strument and protect panel face with cardboard strips c Place instrument and inner container in a heavy carton or wooden box and seal with strong tape or metal bands d Mark shipping container with DELICATE INSTRUMENT FRAGILE etc 2 1 Section TIT RF DETECTOR MAX INPUT VOLTAGE 40 VOLT P PAC 40 VOLT PEAK TRANSIENT 3334 3344 C 03304 334A ONLY 19 LINE switch turns instrument ac power on Pilot lamp glows when instrument is turned ON Meter indicates distortion or voltage level of input 3 MODE switch selects MANUAL or AUTOMATIC bridge tuning operation FREQUENCY RANGE switch selects frequency range which corresponds to fundamental of input signal COARSE BALANCE control provides coarse ad justment for balancing the Wien bridge circuit FINE BALANCE control provides a vernier ad justment for balancing the Wien bridge circuit 1 Frequency dial tunes the Wien bridge circuit to fundamental of input signal 8 HIGH PASS FILTER switch inserts or bypasses HIGH PASS FILTER in SET LEVEL and DIS TORTION function When inserted filter pro vides gt 40 dB attenuation to 50 60 Hz hum components but no attenuation to frequencies over 1 kHz S ourPuT connectors provide means of moni
95. gh A1Q6 Check 25 volts see Symptom 2 A above A1C2 A1C6 A1CR1 A1CR2 and A1Q1 through A1Q3 Check 25 volts see Symptom 2 A above A2C4 A2C14 and A2Q1 through A2Q4 Check 25 volts see Symptom 2 A above 25 volts see Symptom 2 B above A2C15 A2Q5 through A2Q9 Check 8 2 volts bias see Symptom 2 D above check for 4 Vdc at meter terminal and Check MI Check A2Q5 through A2Q9 and A2C23 Check A2C22 Increasing value of capacitor will decrease meter reading Check 25 volts see Symptom 2 A above 25 volts see Symptom 2 B above A3C1 A3C6 and A3Q1 through A3Q3 Check 25 volts see Symptom 2 A above A3C7 and A3Q4 through A3Q6 Change A3R17 Increasing value of resistor will increase voltage at A3TP2 9 13 Section V ure 7 4 for ac and dc voltage levels on meter amplifier If proper signal is not present check post attenuator Measure ac input to impedance converter at A2 pin 1 for approximately 1 mV rms If proper signal is present check impedance converter and power supply Seeappropriate Schematic diagrams for ac and dc voltage levels in impedance converter and power supply H proper signal is not present check input attenuator and FUNCTION switch 5 40 TROUBLESHOOTING DISTORTION 5 41 FUNCTION Followthe steps below to troubleshoot the dis tortion function by first troubleshooting the rejection amplifier and then the automatic control circuit 5 42 a b
96. gnal from the RF carrier and the filter circuit removes any RF components before the signal is applied to the impedance converter circuit through the NORM RF DET switch S7 Figure 4 8 Simplified Metering Circuit 4 7 Section V Model 333A 334A Table 5 1 Required Test Equipment INSTRUMENT RECOMMENDED SPECIFICATIONS USE MODEL Voltmeter Voltage Range 300 LV to Performance Checks hp Model 738BR Volt Calibrator 300 V rms Adjustment and Cali meter Calibrator Accuracy 0 2 at 400 Hz bration Test Oscillator Voltage Range 300 uV to 3V Performance Checks hp Model 652A Test Frequency Range 10 Hz to3 MHz Adjustment and Calibration Oscillator Wave Analyzer Bandwidth 5 kHz to 600 kHz Performance Checks hp Model 310A Wave Dynamic Range 80 dB Analyzer Electronic Functions period 1 sec gate Performance Checks hp Model 5532A Counter Accuracy 2 counts Adjustment and Calibration Electronic Counter Multimeter Voltage Range 10mV to 1000VDC Adjustment and Calibration hp Model 3465A 0 03 readings Troubleshooting PES 0 02 Range Worst Case Oscilloscope Bandwidth DC to 10 MHz hp Model 140A 1402A Vertical Dual Channel 1420A Oscilloscope AC Voltmeter Voltage Range 100 LV to 30V hp Model 400F Frequency Range 20 Hzto4 MHz AC Voltmeter Filter Box Filtered Outputs 500 Hz 5kHz Performance Checks White Model 2640 Filter 250 kHz 600 kHz Set Output Distortion lt 80 dB Power Sup
97. he output of the metering circuit which contains the fundamental frequency if either leg of the bridge is untuned is applied to the buffer amplifier A5Q1 It is amplified by A5Q2 and A5Q3 and coupled to the detector A5Q4 4 30 RefertoFigure4 4 partial schematic for detector operation The discussion is applicable to both resistive and reactive detector circuits 4 31 The signals from the error amplifier A5Q2 and A5Q3 will be equal and of opposite phase and will cancel out each other when the detector A5Q4 is off However when the positive half of the reference square wave gates A5Q4 on the signal from the coll ector of A5Q3 will be shorted to ground Thus the signal from the collector of A5Q2 will be coupled through the filter network to the base of A5Q5 If the signal from A5Q2 is in phase with the reference the positive half of the signal will be passed and if it is out of phase the negative half will be passed 4 32 The normal working voltage at ASTP3 is be tween O and 1 volt The dc output of the filter network causes the voltage at ASTP3 to go in a positive direc tion toward zero for in phase error signals and in a negative direction toward 1 V for out of phase error signals The change in base voltage is then amplified by A5Q5 and lamp driver A5Q6 This will change the brilliance of lamp A6DS1 which will vary the resist ance of A6V1 inthe direction necessary to balance the resistive leg of the bridge C
98. he value of A3R37 is 47 K Q in earlier instruments The vol tage at A3RP2 will also be increased to 20 2 V dc See change No 14 in Appendix C C4 RIO e di TPI R23 R27 14 RT r23 R7 R26 511 Re Os R24 RS LR 3 E pa CI5 334A B 1444 A 3 hp Part No 00333 66503 TROUBLESHOOTING INFORMATION When checking the voltages and waveforms for this circuit set the 333A 334A controls as follows unless otherwise noted FUNCTION 4 soa 9 SET LEVEL METER RANGE 0 3 VOLTS MODE MANUAL SENSITIVITY MAX SENSITIVITY VERNIER MAX FREQUENCY RANGE X100 Frequency Dial 10 Input Signal 0 3 V rms at 1 kHz 0 29 V rms at pin 1 0 185 V rms at pin 7 In DISTORTION function with input nulled signal at pin 7 should change to 2 4 V rms Use a 10 MQ 10 pF impedance probe for this measurement 0 V rms at pin 8 In DISTORTION function but not nulled frequency dial set to 50 signal at pin 8 changes to 0 315 V rms Use a 10 MQ 10 pF impedance probe for this measurement 0 32 V rms at pin 2 gt BR T 833 837 TO NOWA RIG R34 3344 B 1448 00333 B 3787 334A 8 1448 AG AT A3 hp Part No 00333 66506 hp part No 00333 66507 P PART NO 00333 66503 REV D 1 7 LAS eere AMPLIFIER 00333 66503 25V0C 2
99. hielding Coil configuration Meter RAR Meter VU Option 01 only gt Option 01 only Model 333A 334A Section VI Table 8 1 Replaceable Parts Cont d REFERENCE hp DESIGNATOR PART NO DESCRIPTION MER MFR PART NO 0767 0001 R fxd met oxide 4000 5 3 W PMF 3 0687 4701 R fxd comp 470 10 1 2 W EB 4701 0686 3915 R fxd comp 3900 5 1 2 W EB 3915 2100 1738 R var conc rear sect 3k9 panel sect obd 1000 10 2 w R fxd comp 10 kA 5 1 2 W EB 1035 0686 1035 R fxd 1 00 3 3W RS2B 95 0813 0029 R fxd comp 51000 5 1 4 W CB 5125 0683 5125 R fxd comp 13000 5 1 4 W CB 1325 Not assigned R fxd comp 33 KN 5 1 4 W 0683 1325 0683 3335 0686 1055 R fxd comp 1 M 5 1 2 w 3100 0878 Switch function 76854 154055 obd 00331 61902 Switch Assembly sensitivity 0132 0004 C vartrim 0 7 to 3 0 pF 535 009 4R 0160 0205 C fxd mica 10 pF 5 500 vdcw RDM15C100J5S 0140 0152 C fxd mica 1000 pF 5 300 vdew DM16F102J 0160 0958 C fxd mica 390 pF 5 300 vdew RDM15F391J3S 0160 0990 C fxd mica 100 pF 2 300 vdcw RDM15F101G3S 0160 0205 C fxd mica 10 pF 5 500 vdew RDM15C100J58 0698 3118 R fxd met flm 32400 1 1 2 W MF7C T O obd 0698 3119 R fxd met flm 69808 1 1 2 W MF7C T O obd 0757 0846 R fxd met flm 22 1 kN 1 1 2 W MF7C T O obd 0698 3120 R fxd met flm
100. ion hp d Manufacturer s part number boro dd va vow 4 9 9 o9 wo on P FOR Sg r 6 5 3 n t zeessen tts e WMA EE o b o aa 9 9 hod ERU hh ras ata o9 o3 d t o3 o3 Pod to 4 B 3 aaa 9o 9 5 9 PoU9 no dos P Po Ud bo oUw e 9 bos das das bt utt t5 524994u 5 52229249 t29259 282 pee ee EEE EE EER ZZZ RE RU ra ei E NU EN EN ZE NT ps t ci i AM TN ra ie EE e Pros 0818 ene e rene ee pe STUE pere Ire See VEN woo it s se 4 9 4 9 9 3 9 9 98 7asc4 397 98g4a5554279 amp 42 2 2042924 WW Ai M TT A na 0140 99292929h2929945n19 224a9992492292 re sa 9 NW o9 ee 9 P ov 3 P OP Fog dos 9 ov ov O9 9 dono A 4 v o5 v v oa n ovo 4 om 9 ov o re P ov Od amp 9 4 P 9 o9 3 A 9 P9 d aa aa 5 e 9 o d 4 9 coa A AR MAE sk AAA eene at enen tr e PZA A Pw MIL PY o rl enna ABBREVIATIONS NPO yee Sea bee REUS negative positive zero ss ss rr slide mE Silver Hz cee cee hertz cycie s per second KE user tie bad PET eG RE PAP aluminum PEN ari ampere s ID ees inside diameter ODG Ee D A waa order by description TO3 cc cece eee titanium dioxide EEN coefficient K kilohmis 10 3 ohms ENEE kHz Kkilohortz 1043 hertz ppm 9 parts per million wiv working inverse voltage prec s ool precision temperature coeffient w o nania without Peste Dated dep ao de wd f
101. iv Los Angeles Cal Victory Eng Corp Springfield N J Bendix Corp Red Bank Div Red Bank N J Hubbell Corp Mundelein Il Rosan Inc Newport Beach Cal Smith Herman H Inc Brooklyn N Y Tech Labs Palisades Park N J Central Screw Co Chicago Ml Gavitt Wire and Cable Co Div of Amerace Corp Brookfield Mass Burroughs Corp Electronic Tube DIF Plainfield N J Union Carbide Corp Consumer Prod Div New York i Modei Eng and Mig Inc Huntington ind Loyd Seruggs Co Festus Mo Aeronautical Inst amp Radio Co Lodi N J Arco Electronics Inc Great Neck N Y J Glesener Co Inc San Francisco Cal TRW Capacitor Div Ogallaia Neb nen ss a pr From Handbook Supplements H4 1 Dated January 1970 Appendix A Code No Mamifacturer Address 94870 Serkes Tarzian Inc Bloomington Ind 85454 Boonton Molding Company Boonton N J 85471 A B Boyd Co Francisco Cal 85474 R M Bracamonte amp Co San Francisco Cal 85660 Koiled Korda Ine Hamden Conn 85911 Seamless Rubber Co Chicago fl 86174 Fafnir Bearing Co Los Angeles Calif 86197 Clifton Precision Products Co Inc RIE En Clifton Heights Pa 86579 Precision Rubber Products Corp Dayton Ohio 86684 Radio Corp of America Electronic Comp amp Devices Division
102. k 7 6 Power Supply Al 7 13 7 14 Kit er dis Gee WN HA 00 I iv Model 333A 334A Section I SECTION I GENERAL INFORMATION 1 1 DESCRIPTION 1 2 The Hewlett Packard Models 333A and 334A Distortion Analyzers are solid state instruments for measuring distortion on ac voltages The Models 333A and 334A include two control loops that auto matically tune both legs of a bridge circuit which re jects the fundamental when the rejection circuit is initially set within the range of the loops The 334A has a high impedance detector which operates from 550 kHz to greater than 65 MHz and provides the ca pability of monitoring the distortion of the amplitude modulation on an rf carrier 1 3 Distortion levels of 0 1 to 100 full scale are measured in seven ranges for any fundamental frequen cy of 5 Hz to 600 kHz Harmonics are indicated upto 3 MHz The high sensitivity of these instruments re quires only 0 3V rms for the 100 set level reference The distortion characteristics can be monitored atthe OUTPUT connectors with an oscilloscope a true rms voltmeter or a wave analyzer The instruments are capable of an isolation voltage of 400 volts above chassis ground 1 4 The voltmeter can be used separately for general purpose voltage and gain measurements It has a frequency range of 5 Hz to 3 MHz 20 Hz to 500 kHz for 300 uV range and a voltage range of 3004 V to 300 V rms full scale 1 5 The AM detector includ
103. k A5Q5 and check MODE switch connections e Check waveform at A5 pin 16 If proper waveform is present check A5Q1 through A5Q4 and associated circuitry If proper waveform is not present check A2R50 f Check waveform at negative side of A5C10 If proper waveform is present check A5Q7 through A5Q9 and associated circuitry If proper waveform is not present check R6 545 PHOTORESISTOR CHECK AND ADJUSTMENT A VIthru AOVb 5 46 The following steps give a procedure for checking and if necessary adjusting the photoresis tors in the Wienbridge balancing circuit Paragraph 5 48 tells how to check the resistance of each individual photoresistor If a photoresistor is not within toler ance adjustthe resistance of it according to the steps in Paragraph 5 48 9 47 a b C PHOTORESISTOR V1 Section V PHOTORESISTOR CHECK Turn 333A 334A off and set MODE to MANUAL and FREQUENCY RANGE to X1K Disconnect all wires to A6 board except to pins 6 7 and 8 lamp drive voltage connec tions Turn 333A 334A on and check value of photoresistors at pins listed in Table 5 9 Allow a tolerance of 20 on values Table 5 9 Photoresistor Check PINS A6 RESISTANCE 10 v2 2 3 V3 1 10 V4 3 4 V5 9 10 If any resistance value is out of tolerance refer to Paragraph 5 48 If all values are within tolerance reconnect wires to A6 board See Figure 7 1 for wire color code diagram of
104. le deflection on all ranges from 1 mV to 300 V full scale The meter circuit sensitivity is increased to 300 uV for full Scale deflection on the 0003V range by switching resistors A2R29 and A2R30 into the calibration net work Resistor A2R41 and capacitor A2C29 are also switched into the calibration network on the 0003V range to extend the passband of the amplifier 4 45 METER AMPLIFIER CIRCUIT 4 46 The meter amplifier circuit consists of a five stage amplifier circuit A2Q5 through A2Q9 which develops the current for full scale meter deflection Negative dc feedback from the emitter circuit of A2Q8 is applied to the base of A2Q5 to stabilize the dc operating point of the meter amplifier circuit and to minimize the tendency for dc drift due to ambient temperature changes A2R51 and A2CR8 are electric ally in the circuit only whenthe meter amplifier is over loaded When the voltage on the emitter of A2Q9 4 5 Section IV 100 80 60 40 20 10 90 70 50 30 9 8 6 T 5 4 3 2 1 8 6 4 2 08 06 04 O 2 Ol Ye PERCENT BANOWIDTH f KK 1 5 3 07 05 03 008 006 004 002 001 009 007 005 003 Model 333A 334A E E EE MEME MEME VE E rc s 30 40 50 60 70 DEPTH OF NULL DB O 10 20 Af APPROXIMATE PERCENT BANDWIOTH Ee SC KO 333A 334A R
105. lectronics Co New York N Y Scionies CorP Northridge Cal Adjustable Bushing Co N Hollywood Cal Micron Electronics Garden City Long Island N Y Amprobe Inst Corp Lynbrook N Y Cabietronica Costa Mesa Cal Twentieth Coil SEENEN Santa Clara Cal Fenwal Elect Inc Maas Amelco Inc Mountain View Cal Spruce Pine Mica Co Spruce Pine N C Omni Spectra Inc oe ee ee 9 4 I 09 u Detroit mM Computer Diode Corp Lodi N J Electroid Co Union N J Boots Aircraft Nut Corp PEZET Pasadena Cal Ideal Prec Meter Co Inc De Jur Meter Div Brooklyn N Y Deico Radio Div of G M Corp Kokomo Ind dn eR os Canoga Park Cal Mountain View Cal Thermonetics Inc Tranex Company Hamlin Metal Products Corp Akron Ohio Angstrohm Prec Inc No Hollywood Cal Siliconix Inc Sunnyvale Cal McGraw Edison Co Manchester N H Power Design Pacific Inc Palo Alto Cal Clevite Corp Semiconductor Div Palo Alto Cal Signetica Corp Sunnyvale Cal Ty Car M g Co Inc Holliston Mass TRW Elect Comp Dis Des Plaines LI Chomerics Plainville Mass Curtis Instrument Inc Mt Kisco N Y Vishay Instruments Inc Malvern Pa E I DuPont and Co Inc Wilmington Dei Durant Mfg Co
106. marked on the circuit board to identify it Refer to Section VI for parts replacement and hp part number informa tion 5 51 The etched circuit boards are of the plated through type The electrical connection between the two sides of the board is made by a layer of metal plated through the component hole When working on these boards observe the following rules a Use a low heat 25 to 30 watts small tip soldering iron and a small diameter rosin core solder b Remove circuit components by placing the soldering iron on the component lead on either side of the board and pulling up on the lead If a component is obviously dam aged clip leads off as close to the compo nent as possible and then remove leads with a soldering iron EXCESSIVE HEAT CAN CAUSE THE CIRCUIT AND BOARD TO SEPARATE OR CAUSE DAMAGE TO THE COMPO _ NENTS C Clean component lead hole by heating the hole with the iron and inserting a wooden toothpick Remove the toothpick after the solder has cooled and insert the new component lead d To replace components shape new leads and insert them in lead holes Reheat the soldering Model 333A 334A iron and add small amount of new solder as re quiredto insure a good electrical connection e Clean excessive flux from the connection and adjoining area 9 92 SERVICING ROTARY SWITCHES 5 53 The 333A 334A has five rotary type switches FUNCTION SENSITIVITY FREQUENCY RANGE MODE and METER RA
107. minals provide connection for external batteries Page 3 2 Delete text under Paragraph 3 15 Add steps a and b indicated below a If line voltage is to be used set 115 230 V ac Switch to coincide with voltage Turn LINE switch to ON position Pilot lamp will glow indicating application of primary power b If batteries are to be used connect both a 28 to 50 V and 28 to 50 V battery or other de source to and battery terminals respectively The LINE switch and pilot lamp are not n the circuit when batteries are used therefore an external switch may be used to provide a convenient means for disconnecting the batteries When a dc power source is used check the 25 V power supply output any violet lead If the output is not 25 V 0 5 V adjust the power supply according to the procedure in Paragraph 5 26 4 7 Add the following text to the discussion on the Power Supply Circuit Model 3334 334A Appendix C 4 53 Diodes A1CR5 and A1CR6 are coupling and pro tection diodes for external battery supplies The diodes protect the series regulator circuits from application of incorrect polarity at the battery input terminals The diodes also protect external batteries from being charged when the ac power 1s being used with batteries connected to the battery terminals Page 5 1 Paragraph 5 7 Change the first sentence to read The performance checks are made with the ac power cord connected to nominal li
108. mini t Z COPYRIGHT 1965 BY HEWLETT PACKARD COMPANY Figure 7 5 Control Circuit A5 and Bridge Balance P O A6 7 11 7 12 7 12 334A B 1447 Al hp Part No 00333 66501 SWITCH ASSEMBLY CONFIGURATION SLIDE VOLTAGE POSITION 240V ABC 220V AGD I20 V Bac LOOV B amp D BACKDATING INFORMATION NOTE 1 R12 was located on the Al Assembly and designated as AIR1 The resistor was connected between pins 10 and 11 on Al See Appendix C for applicable serial numbers NOTE 2 R9 is added here on instruments prefixed 820 822 for 334A and below NOTE 3 Value was 01 uF on serials 820 01245 822 01565 for 334A and below NOTE 4 C8 is added to instruments whose serial number is 533 00200 538 00200 for 334A and below NOTE 5 A1R13 was different in some earlier instruments and is not di rectly interchangeable with the one listed in Table 6 1 See Appendix C for applicable serial numbers NOTE 6 In some earlier instruments A1R6 was 12 1 kQ and A1R7 was 12 7 KQ To improve power supply regulation these resistors should be changed to the values shown in Figure 7 6 See Appendix C for applicable serial numbers WI CHCKE SEE NOTE 2 LI 2 5 MH 602 MAT 220 240V 150 mAT 100 120V COPYRIGHT 1965 BY HEWLETT PACKARD COMPANY 3334 3344 D 0332 E CRS SERIES REGULATOR EMITTER FOLLOWER 146 1 bol 2 lt IMY P P RIPPLE 3 25 VDC 1 Si Tsx
109. n AM detector circuitfor measuring envelope distortion in AM carriers The input signal is applied to the in put of the AM detector circuit where the modulating signal is recovered from the RF carrier The signal is then applied to the impedance converter circuit through the one megohm attenuator and then through the same circuits previously described in the distor tion measuring mode operation 4 10 VOLTMETER OPERATION 4 11 Inthe voltmeter mode of operation the input signal is applied to the impedance converter circuit through the 1 1 and 1000 1 attenuator The 1 1 atten uation ratio is used onthe 0 0003 to0 3 VOLTS ranges and the 1000 1 attenuation ratio is used in the 1 to 300 VOLTS ranges With the FUNCTION switch in the VOLTMETER position the output of the impedance converter bypasses the rejection amplifier and is applied to the metering circuit through the post attenuator METER RANGE switch Metering circuit sensitivity is increased from 1 mV for full scale deflection to 300 uV on the 0003V range as it wasin the distortion measuring operation The function of the post attenuator and metering circuit is the same for voltmeter operation as for the distortion measuring operation 4 12 DETAILED CIRCUIT DESCRIPTION IMPEDANCE CONVERTER CIRCUIT Refer to Figure 4 13 4 14 The input signal is applied to the impedance converter circuitthroughthe 1 1 and 1000 1 attenuator S3R12 in voltmeter operation and th
110. n corresponds to the average value of the current pulses rather than the peak value The meter is calibrated to indicate the rms value of a sine wave Resistor A2R45 im presses a fixed bias across diodes A2CR6 and A2CR7 biasing them close to the barrier voltage to makethe meter amplifier response linear to large variations Section IV in signal amplitude The linearity of this type of cir cuit is also increased by including the meter circuit in the overall feedback loop 4 49 POWER SUPPLY CIRCUIT Refer to Figure 7 6 4 50 The power supply circuit consists of a 25 volt series regulated supply anda 25 volt series regulated supply which is the reference supply for the 25 volt supply 4 51 The 25 volt regulated supply is ofthe conven tional seriesregulator type The amplifier A1Q5 is used to increase the loop gain of the circuit thus im proving voltage regulation The positive feedback applied to the junction of A1R11 and A1R12 is used to further improve the line frequency suppression of the circuit 4 52 The 25 volt regulated supply is of the conven tional series regulator type and operates the same as the 25 volt regulated supply 4 53 RF DETECTOR CIRCUIT 334A only Refer to Figure 7 2 4 54 The RF detector circuit consists of a rectifier A4CR1 and filter circuit The RF signal is applied to the circuit through the RF INPUT connector onthe rear panel The rectifier diode A4CR1 recovers the modulating si
111. n turn cause resistance changes in photocells that form part of the Wien bridge 4 28 When the bridge circuit is tuned and balanced the voltage and phase of the fundamental which appears at junction of the series reactive leg SARI 3 5 7 or 9 and C4A B and the shunt reactive leg S4R11 13 15 17 or 19 and C4C D is the same as at the midpoint of the resistive leg A3R12 and A3R14 When these two voltages are equal and in phase the fundamental frequency will not appear at the drain of the field effect transistor A3Q4 For frequencies other than the fundamental the reactive leg of the Wien bridge offers various degrees of attenuation and phase shift which cause a voltage at the output points of the bridge This difference volt age betweenthe reactive leg and resistive leg is amp lified by A394 A3Q5 and A3Q6 Figure 4 3 illus trates a typical Wien bridge circuit and the rejection characteristics for it 4 29 The Wien bridge circuit is designed to cover a continuous frequency range of over a decade for each position of the FREQUENCY RANGE selector S S4 provides coarse tuning of the reactive leg by changing the bridge circuit constants in five steps at 1 decade per step For the automatic control loop the refer ence voltage is taken from R6 at the input to the re jection amplifier and applied to the buffer amplifier A5Q7 The reference voltage is amplified and clipped by A5Q8 and A5Q9 and coupled to the detector A5Q4 T
112. nd Xcelite Inc Orchard Park N Y San Fernando Elec Mig Co San Fernando Cal Thomson Ind Inc Long Island N Y Industrial Retaining Ring Co Irvington N J Automatic amp Precision Mfg Englewood N J Reon Resistor Corp Yonkers N Y Litton System Inc Adler Westrex Commun Die New Rochelle N Y R Tronics Inc Jamaica N Y Rubber Teck Inc Gardena Cal Hewlett Packard Co cpu Pasadena Cal Medical Elec Div Microdot Inc So Pasadena Cal Sealectro Corp Mamaronech N Y Zero M g Co Burbank Cal Bte E EEN Es Cleveland Ohio I a a Minneapolis Minn Paeco Division of Hewlett Packard Co EE Palo Alto Cal North Hills Electronics Inc Glen Cove N Y International Electronic Research Corp ECKER Burbank Cal Columbia Technical Corp New York N Y Varian Associates Palo Alto Cal Atlee Corp Winchester Masa Marshall Ind Capacitor Div Monrovia Cal Control Switch Division Controls Co of America El Segundo Cal Delevan Electronics Corp East Aurora N Y Wilco Corporation lis Ind Branson Corp Whippany N J Rembrandt nc Boston Mass Hoffman Electronics Corp Semiconductor Division El Monte Cal Technology Instrument Corp of California Newbury Park Cal The following HP Vendors have no numbe
113. ne voltage 115 V 220 V 48 to 440 Hz Page 5 8 Paragraph 5 25 Change 440 Hz to 66 Hz Figure 6 1 Page 6 2 Add battery terminal inputs Index No s 34 35 and 36 to the top and bottom view of the cabinet Figure 6 1 Page 6 3 Add the Index No s and associated data as indicated below INDEX NO PART NO TQ DESCRIPTION 34 0340 0087 1 Insulator Binding Post Triple 35 0340 0091 1 Insulator Binding Post Triple 36 1510 0011 3 Binding Post Assembly Black Change Index No 15 to Part No 1510 0091 and Index No 22 to Part No 1510 0534 Page 6 12 Table 6 1 Delete J1 J2 Add J1 thru J3 Figure 7 6 Page 7 13 7 14 Add J3 to the schematic as shown below p mp y A em C 5
114. ng the voltages and waveforms for this circuit set the 333A 334A controls as follows unless otherwise noted 1 KHz for full scale indication on H 42 Q Jd 8 BE 3 fa Di lt ca Na 49 84 A A lt I lt I I Bids JE n SEEISE co 4 e to Ju a x MO PR I Eu dic GE P e M A gt CIE A O sa SS O SE Ze Q FE gt gt gt gt gt gt gt gt gt gt st STEIER dk ie 2 88 2 E S o PEAS Se O o o oo Saon a REE g EM fa ex m ku fu S I Gi Gi Yr Yr Yr AS contro CIRCUIT 00333 66505 I 1 d RESISTIVE CONTROL LOOP QI THRU Q9 m vr I E RIS Sy gt 9 2 5 1 FFER n BU R4 cs Lcs ce ce Ge 30 16 R AMPL IOK 7 10 50 eps 50 DETECTOR T 2590 IBYOL E gt 10 bre TOR Yr oP I T Y SENE AED WRS SE i RIS i IOK 14 Kos Rt4 200 RB uc wd S4AF V A Uu Ia xi 4 Ye ore E 15 I gt I ECE R69 of n REACTIVE IOK 12K CONTROL LOOP I I QIO THRU 018 1 I I g i Ca I 70 52 i R46 I I E Wo 10 8 iok oe eee R36 I 10K V R37 cie c22 CR4 ud R70 cz9 I I 30K 33PF I P O 1 R35 TP4 S4AR o R40 n 25V 2 12K ej a 6 92 3 V V I H TT KENNEN EE 7 e R48 l OK f R4 l i 200 M 8 3334 334A 0333A o Gal ii o
115. ol loops resistive and reactive that are identical with the exception of the 909 phase lag cir cuit in the reactive loop The following steps list a procedure for checking the resistive loop only how ever the same general procedure can be used to check the reactive loop Refer to the schematic dia gram of Figure 7 5 for circuit voltages and wave forms as well as the 333A 334A control settings a Check waveform at A5TP1 If proper wave form is present proceed to step b if not go to step f b Check waveform at ASTP2 If proper wave form is present proceed to step c it not go to step e c Measure dc voltage at A5 pin 17forapproxi mately 16V manual mode Set FUNCTION to DISTORTION and manually null the input signal Set MODE to AUTOMATIC turn BALANCE COARSE control fully counter clockwise and check for approximately 20 Vdc at A5 pin 17 Then turn BALANCE COARSE control fully clockwise and check for approximately 12 Vdc at A5 pin 17 If proper voltages are present check photoresistors as outlined in Paragraph 5 46 If proper voltages are not present goto stepd d Measure dc voltage at ASTP3 for approxi mately 0 5 V manual mode Set MODE to AUTOMATIC turn BALANCE COARSE con trol fully counterclockwise and check for approximately 1 Vdc at ASTP3 then turn BALANCE COARSE control fully clockwise and check for 0 Vdc at ASTP3 If proper voltages are present check A5Q6 If proper voltages are not present chec
116. ome earlier instru ments These capacitors should not be changed unless frequency re sponse becomes a problem at 3 MHz and 1 MHz respectively Refer to Appendix C Change No 5 for applicable serial numbers 7 9a TROUBLESHOOTING INFORMATION 1 mV rms between pins 6 and 15 for full scale deflection on the 0 to 1 scale on the 0 001 V to 300 V ranges 300 uV rms between pins 6 and 15 for 300 uV indication on 300 LV range 7 4V Voltage between collector of A2Q7 and pin 15 for full scale deflection 7 1 V on the 0 to 1 scale 6 9V Voltage between collector of A2Q9 and pin 15 for full scale deflection 4 875V on the 0 to 1 scale on 0 01 V range 3 125V 2 5V 6 92 8 VErt and above Cannot be measured on 0 01 V range and below because the meter amplifier will oscillate 0 3 V p p from either pin 10 or 11 to ground for full scale deflection on 0 to 1 scale R24 R25 R37 MOJO R27 R36 CR8 RS R43 EN O R35 9 15 C23 R30 C22 R29 G 014 99 er O hp Part No 00333 66512 7 9b 25 VDC METER 4 RANGE ON MODELS 333A AND 334A WITH OPTION 13 Oss ENS T Te SS i poA2 METER AMPLIFIER 00333 66512 r J r 1 1 R42 I i 10 I SIR ISZCF S3CR G 1 220 MAL 13 1 1 J 2 e O O O BIAS 0 SEE NOTE I ci7 R43 C24 I
117. on of 9 mV on 333A 334A meter d Set a reference on meter of test oscillator and use amplitude control to maintain set reference whenever frequency of oscillator is varied e Set test oscillator frequency to 100 kHz f Adjust S2C5 for 333A 334A meter indication of 9 mV g Set 333A 334A SENSITIVITY switch to each position listed in Table 5 6 and increase test oscillator output by 10 dB for each re spective decrease in SENSITIVITY switch position Adjust appropriate capacitor for 333A 334A meter indication of 9 mV at each setting NOTE When switching the SENSITIVITY positions be careful not to move SENSITIVITY VERNIER control from MAX position 5 31 ADJUSTMENT OF FACTORY SELECTED COMPONENTS gt 5 32 Certain components in the Model 333A 334A are individually selected to compensate for varying circuit parameters These components are designated by an asterisk on the schematic and in the parts list and the typical value is shown Table 5 7 describes the function of the factory selected compo nents and lists their value ranges 5 33 TROUBLESHOOTING PROCEDURES 5 34 This section contains procedures designed to assist in the isolation of malfunctions These pro cedures are based on a systematic analysis of the instrument circuits in an effort to localize the prob Table 5 6 Sensitivity Switch Calibration SENSITIVITY TEST OSCILLATOR Switch OUTPUT Increase FOR 50 ue Position 4 Position 3 P
118. osition 2 Position 1 5 11 Section V lem These operations should be undertaken only after it has been established that the difficulty cannot be eliminated by the Adjustment and Calibration Proced ures An investigation should also be made to insure that the trouble is not a result of conditions external to the 333A 334A 5 35 Conduct a visual check of the 333A 334A for possible burned or loose components loose connec tions or any other obvious condition which might suggest a source of trouble Model 333A 334 5 37 Trouble in the Model 333A 334A can generally be isolated to circuits of one of the two principie instrument functions voltmeter or distortion In order for the distortion function to operate properly the voltmeter function must operate properly There fore troubleshoot the voltmeter function first to assure that it works normally before attempting to locate a trouble in the distortion function 9 38 TROUBLESHOOTING VOLTMETER FUNCTION 5 39 Follow the steps below to troubleshoot the volt meter function THE 333A 334A CONTAINS VERY HIGH IMPED ANCE HIGH FREQUENCY CIRCUITS CON TAMINATION OF THE SWITCHES CIRCUIT BOARDS OR TUNING CAPACITOR WILL CAUSE HIGH IMPEDANCE LEAKAGE PATHS AND SUBSEQUENT DETERIORATION OF THE b PERFORMANCE OF THE INSTRUMENT AVOID TOUCHING ANY OF THESE CIRCUITS WITH THE BARE FINGERS ASSKIN OILS ARE EXTREMELY CONTAMINATING 5 36 Table 5 8 contains a list of ty
119. ough null a similar waveform is produced Figure 4 2c The only difference is that the reactive signal is 90 out of phase with the resistive signal 4 25 When the bridge output is detected using the input signal as the reference the error signals in phase or 180 out of phase with the reference develop a voltage that is used to vary the resistance in the resistive leg of the bridge to tune it to the correct null position Signals of the form in Figure 4 2c do not develop any voltage as the resistive detector is in sensitive to inputs differing from the reference by 909 Model 333A 334A TYPICAL WIEN BRIDGE a e wi ba E lt E w Section IV RESULT OF FEEDBACK SEET J e e x g 3 yx 9 aASE DEGPEESI FREBUENCY Figure 4 3 Wien Bridge Circuit and Rejection Characteristics 4 26 In an independent but similar control loop the bridge input signal is shifted 909 and used as the reference signal for the detector This detector develops control voltages to null the reactive leg of the bridge but is insensitive to signals of the form in Figure 4 2b which are caused by small tuning errors of the resistive branch 4 27 The result is that the two control loops derive information from a common source and develop two independent control signals for nulling the two legs of the bridge These control voltages are used to vary the brilliance of lamps which i
120. p 5 1 KO 5 1 2 W EB2025 EB5125 Assembly etched circuit board meter amplifier and impedance converter includes C1 thru C29 CR1 thru CR8 Q1 thru Q9 R1 thru R51 Assembly etched circuit board meter amplifier and impedance converter Option 01 only includes C1 thru C25 Q1 thru Q9 C27 thru C29 R1 thru R51 CRI thru CR8 RDM15C120J5C C fxd mica 12 pF 5 RDM15F391J3C C fxd mica 390 pF 5 See Appendix C for backdating information Model 333A 334A Section VI Table 6 1 Replaceable Parts Cont d REFERENCE hp DESIGNATOR PART NO NN DESCRIPTION MPR MFR PART NO 0180 0101 A2C4 0180 0033 A2C5 A2C6 0180 0060 0140 0145 0180 0224 A2C7 A2C8 0140 0193 0180 0104 A2C9 A2C10 0140 0200 0160 0170 A2C11 A2C12 0160 0161 0180 0307 A2C13 A2C14 0180 1736 A2C15 0160 0195 0140 0218 A2C16 A2C17 0180 0061 A2C18 0140 0200 0160 0174 A2C19 A2C20 0130 0017 0140 0190 0140 0199 A2C21 A2C22 A2C23 0150 0121 0180 1941 A2C24 A2C25 A2C26 0180 0033 4 A2C26 A2C27 A2C28 0180 0058 A2C29 0140 0198 0180 0228 A2C30 A2CR1 thru 1901 0044 A2CR4 A2CR5 A2CR6 A2CR7 A2CR8 1901 0535 1902 0584
121. pical front panel and internal trouble symptoms as well asthe probable cause c oftrouble Ifthe instrument malfunction cannot be loca tedthrough use of the table refer to Paragraphs 5 38 through 5 44 a Set 333A 334A controls as follows FUNCTION o VOLTMETER METER RANGE 1VOLT Connect a 1 V rms 1 kHz signal to 333A 334A INPUT TERMINALS Measure ac output of impedance converter at A2 pin 4 for approximately 1 mV rms Use 10 MN 10 pF impedance probe If proper signal is present proceed to step c if not proceed to step d Measure ac input to meter amplifier at A2 pin 6for approximately 1 mV rms If proper signal is present check meter amplifier circuit See schematic diagram of Fig Table 5 7 Factory Selected Components COMPONENT FUNCTION A2C22 Sets range of A2C21 VALUE Normal Adjusts meter frequency response in 2 MHz region A2C23 Adjusts meter frequency response in 20 Hz region A2C30 Adjusts meter flatness on 0 0003 V range at 300 kHz A2C29 Adjusts meter amplifier gain on 0 0003 V range at 400 Hz A2R30 Adjusts bridge amplifier frequency response in 1 MHz to 3 MHz region A3C11 A3R17 Adjusts gain of rejection amplifier C9 Adjusts tracking of frequency dial R3 Adjusts range of S2R8 Adjusts flatness of 1000 1 atten uator in 2 MHz to 3 MHz region S3R14 Must be individually matched SAR6 through to be 1 4 SAR26 Model 3
122. ply Output Voltage 400 Vdc Performance Checks hp Model 6515A Power Supply Signal Generator Carrier Frequency 1 MHz Performance Checks hp Model 606A Signal Modulation External upto 50 Model 334A only Generator Oscillator Voltage Range 1V Performance Checks hp Model 204C Frequency Range 1 kHz Oscillator Output Floating 400 Vdc AC Probe Input Impedance 10 MO Troubleshooting hp Model 11074A shunted by 10 pF Voltage Divider Probe hp Model 11048B and hp Model 11095A Performance Checks Adjustment and Calibration Feedthru 500 1 and Feedthru 6009 1 Terminating Resistances Resistance 6009 Performance Checks See Figure 5 7 and Resistance 100 KS Shielded Loads Resistors Fxd 100 KQ 1 1 2 W Performance Checks hp Part No 0727 0208 hp Part No 0757 0215 hp Part No 0730 0156 and Fxd 10 kQ 1 1 2 W Fxd 500 kQ 1 1W 9 0 Model 333A 334A Section V SECTION V MAINTENANCE 5 1 INTRODUCTION 5 2 This section contains maintenance and service information for the 333A and 334A Distortion Analy zers Included are Performance Checks Adjustment and Calibration Procedures and Troubleshooting Techniques 5 3 REQUIRED TEST EQUIPMENT 5 4 The equipment needed to properly maintain the Model 333A 334A is listed in Table 5 1 If the re commended model is not available any instrument th
123. present check A3Q4 through A3Q6 and associated circuitry If proper voltage is not present check Wien bridge circuit f Measure ac input to rejection amplifier at A3 pin 1 for approximately 0 29 V rms If proper voltage is present check A3Q1 through A3Q3 and associated circuitry If proper Table 5 8 Troubleshooting Aid Cont d E PROBABLE CAUSE 3 AUTOMATIC MODE INOPERATIVE No indication of square wave reference voltage frequency of fundamental of the input signal at ASTP1 and ASTP4 No indication of square wave at A5TPA ASTP1 normal square wave indication No indication of square wave at ASTP1 ASTP4 normal square wave indication No bridge error signal at ASTP2 or ASTP5 No indication of chopped sine wave frequency of fundamental of the input signal at A2T P2 AST P2 normal No indication of chopped sine wave at ASTP5 A5TP2 indication normal Normal indication at A5TP1 TP2 TP4 and TP5 Drifts off null on any one frequency range Check ASQ7 Check A5Q15 through A5Q18 and A5Q12 Check A5Q8 A5Q9 and A5Q4 Check A2R50 and A5Q1 Check A5Q2 thru A5Q4 Check A5Q10 thru A5Q12 Check A5Q5 A5Q6 A5Q13 and A5Q14 Check for open capacitor SAC1 C5 on fre quency range with problem Model 333A 334A voltage is not present check sensitivity vernier and check function switch connections 9 43 AUTOMATIC CONTROL CIRCUIT 5 44 The automatic control circuit is made up of two contr
124. put impedance independent of source impedance placed at the INPUT terminals The rejection ampli fier rejects the fundamental frequency of the input signal and passes the remaining frequency components on to the metering circuit for measuring distortion The metering circuit provides visual indications of distortion and voltage levels on the front panel meter M1 The AM detector Model 334A only detects the modulating signal from the RF carrier and filters all RF components from the modulating signal before it is applied to the impedance converter circuit 4 3 BLOCK DIAGRAM DESCRIPTION Refer to Figure 4 1 4 4 DISTORTION MEASURING OPERATION 4 5 For distortion measurement the input signalis applied to the impedance converter Assembly A2 through the FUNCTION selector S1 and the one megohm attenuator The one megohm attenuator is a voltage divider network which provides 50 dB atten uation in 10 dB steps The desired level of attenuation is selected by the SENSITIVITY selector S2 The impedance converter provides impedance matching and unity gain between the INPUT terminals and the input of the rejection amplifier 4 6 Therejectionamplifier consists of a preamplifier a Wien bridge and a bridge amplifier The SENSITIVITY VERNIER control at the input of the preamplifier provides a set level signal to obtain a full scale read ing on the meter for any voltage level at the input of the instrument With the FUNCTION switch inth
125. r assigned in the latest supplement to the Federal Supply Code for Manufacturers Handbook 0000F 0000Z 000AB 000BB 00015 49 Revised Los Angeles Calif Newark N J Maico Tool and Die Willow Leather Products Corp Precision Instrument Comp Co Van Nuys Cal May 1970 000CS Hewlett Packard Co Colorado England 000MM Rubber Eng Development OGONN A N D Mfg Co Springs Div Colorado Springs Colorado 000WW California Eastern Lab Hayward Cal 000YY S K Smith Co SE EE San Jose Cal 000QQ Cooltron Oakland Cal Burlington Cal FARAI qual ass Los Cal From Handbook Supplements H4 1 Dated Jamiary 1970 Appendix C Model 333A 334A y MANUAL BACKDATING CHANGES MODEL 333A 334A DISTORTION ANALYZER This manual backdating sheet makes this manual applicable to earlier instru ments Instrument component values that differ from those in the manual yet are not listed in the backdating sheet should be replaced using the part number given in the manual 333A Instrument Serial Prefix Make Manual Changes 533 00200 and below 1 thru 13 624 00800 and below 820 01315 and below 910 01350 and below 910 01420 and below 910 01525 and below 48 thru 413 NOTE 2 9 thru 13 910 01665 and below 10 thru 13 980 01835 and below 412 413 1137402170 and below 1137A02625 and below 14 1197402945 and below 15 Gem and below Im 113740331
126. r of the signal is measured the reading ob tained on an average responding meter may deviate from the true total rms value When the residual wave contains many inharmonically related sinusoids the maximum error in the distortion reading is about 11 95 11 of the measured distortion low for dis tortion levels below 10 EXAMPLE Measured Maximum Error Total Distortion In Meter Indication Distortion 2 5 0 11x0 025 0 02540 0027 0 00027 0 0277 or 2 8 This example representsthe maximum possible error and in most cases the error is less In distortion measurements the reading of an average responding meter is sufficiently close to the rms value to be satisfactory for most applications 3 12 OUTPUT TERMINALS 3 13 The OUTPUT terminals provide a 0 1 V rms open circuit output for full scale meter deflection These terminals can be used to monitor the output signal with an oscilloscope a true rms voltmeter or a wave analyzer The combination of the distortion meter and oscilloscope provides more significant in 3 1 Section II formation about the device under test than the expression of distortion magnitude alone Information obtained from the oscilloscope pattern is specific and reveals the nature of distortion which sometimes occurs at such low levels that it is difficult to detect in the presence of hum and noise The impedance at the OUTPUT terminals is 2000 ohms therefore ca pacitive loads greater than
127. ration 3 1 Introduction s e 3 1 Procedure oe ee 5 8 3 4 Controls and Indicators 3 1 5 26 Power Supply and Bias 3 6 General Operating Information 3 1 Adjustments 5 8 3 7 Input Connections 3 1 5 27 Voltmeter Gain Adjustments 5 8 3 9 Voltmeter Characteristics 3 1 5 28 Voltmeter Frequency Response 3 12 Output Terminals 3 2 Adjustment 5 10 3 14 Operating Procedures 3 2 5 29 Bridge Balance Adjustment 5 10 3 15 Instrument Turn On 3 2 5 30 Sensitivity Switch Calibration 5 11 didi d T 5 31 Adjustment of Factory Selected 3 18 Distortion Measurement 3 2 COMPONEN sea ire SUL 3 21 Distortion Measurement of AM 5 33 Troubleshooting Procedure 5 11 RF Carriers 334A only 3 3 5 38 Troubleshooting Voltmeter 3 22 Voltage Measurement 3 3 Function 9 12 3 23 Meter Indication 3 4 9 40 Troubleshooting Distortion 3 27 Use of Output Terminals 3 4 Function 9 14 3 30 333A 334A with Option 01 3 4 5 45 Photoresistor Check and 3 32 Manual Nulling 3 4 Adjustment A6V1 thru A6V5 5 15 Section Page 9 49 Servicing Etched Circuit IV THEORY OF OPERATION 4 1 Boards 9 16 4 1 Overall Description 4 1 5 52 Servicing Rotary Switches 5 16 4 3 Block Diagram Description 4 1 5 54 Isolating the Impedance 4 4 Distortion Measuring Converter 4
128. rcuit board power supply hp includes C1 thru C11 Q1 thru Q6 CR thru CR7 R1 thru R15 C fxd Al elect 200 uF 100 10 50 vdew 34D39720DSB C fxd Al elect 100 uF 75 10 15 vdcw 30D107G015DC2 DSM C fxd cer 2200 pF 20 500 vdcw C067B501G222MLO5 CDH C fxd Al elect 50 uF 75 10 25 vdew 30D506G025CC2 DSM C fxd Al elect 40 uF 75 10 50 vdew 30D406G050D2 DSM fxd Al elect 100 uF 75 10 12 vdew 30D107G012CC2 DSM Not assigned C fxd Al elect 100 uF 75 10 15 vdew 30D107G015DC2 DSM C fxd Al elect 10 uF 7595 10 25 vdew 30D106G025BB2 SM D C fxd Al elect 40 uF 75 10 50 vdcw 30D406G050DD2 DSM Diode Si 200 piv 0 75A SR1358 8 Diode breakdown 7 2V 2 400 mW SZ10939 144 TSTR Si NPN 2N1701 2N701 TSTR Si NPN 2N3053 2N3053 TSTR Si PNP 2N2904A TSTR Si NPN 2N1701 2N1701 Not assigned R fxd met oxide 100 2 3 W FP 3 R fxd comp 1 KR 5 1 2 W EB1025 R fxd comp 7 5 kQ 595 1 2 W EB7525 R fxd comp 6 8 kQ 595 1 2 W EB6825 R fxd flm 7 15 kQ 1 1 8 W 0698 4471 R fxd met fim 7 50 KR 1 1 8 W 0757 0440 R fxd comp 1 kN 5 1 2 W EB1025 R fxd met oxide 100 2 3 w FP 3 obd R fxd comp 68000 5 1 2 W EB6825 R fxd comp 7 5 kQ 5 1 2 W EB7525 R var lin cermet flm 1 kQ 10 1 2 W R fxd comp 2 KQ 5 1 2 W R fxd com
129. reject the fundamental 4 36 When the FUNCTION selector is set to the VOLTMETER or SET LEVEL position the junction of the series and shunt reactive branches ofthe Wien bridge is connected to circuit groundthrough A3R19 by S1BF which disables the frequency rejection characteristic of the bridge circuit With the bridge circuit disabled the rejection amplifier circuit pro vides one dB of gain for the fundamental frequency and the harmonics In the SET LEVEL operation this signal is used to establish the SET LEVEL refer ence 4 37 BRIDGE AMPLIFIER CIRCUIT 4 38 The bridge amplifier circuit consists of three stages of amplification A3Q4 through A3Q6 The first stage of amplification A3Q4 is a field effect transistor which amplifies the difference signal between the gate and the source The field effect transistor is selected for minimum noise performance with the high impedances of the Wien bridge circuit The signal from the drain is applied to the two stage feedback amplifier A3Q5 and A3Q6 The output of A3Q6 is coupled to the meter circuit by the post attenuator S3R1 through S3R11 Negative feedback fromthe out put of the bridge amplifier is applied to the preamp lifier circuit to narrow the frequency rejection characteristic It can be noted from the rejection characteristic refer to Figure 4 3 for the bridge that the rejection of harmonic voltages is not con stant Typically the second harmonic is attenuated several dB more
130. rough the one megohm attenuator S2R1 through S2R6 in distortion operation Capacitive dividers S2C1 through S2C10 in the attenuator keep the frequency response flat The impedance converter is a low distortion high input impedance amplifier circuit with gain indepen dent of the source impedance placed at the INPUT terminals 4 15 Instrument induced distortion of the signal being measured is minimized by keeping the input impedance and the gain of the impedance converter 4 1 Section IV linear The input impedance is kept linear by use of local positive feedback from the source of A2Q1 to the gate of A2Q1 and to the protective diodes A2CR2 and A2CR3 Thus signals with a large source imped ance can be measured accurately Overall induced distortion is further minimized by a high open loop gain and 100 negative feedback The high open loop gain is achieved by local positive feedback from the emitter of A2Q3 to the collector of A2Q2 Overall negative feedback from the emitter circuit of A2Q4 to the source of A2Q1 results in unity gain from the impedance converter 4 16 Thebias points of thetransistors in the imped ance converter are selected to minimize instrument induced distortion A2Q1 an extremely low noise high impedance field effect transistor is the major component that makes linearity of the impedance con verter independent of the signal source impedance 4 17 REJECTION AMPLIFIER CIRCUIT Refer to Figures 7 3 and
131. rp Chester Pa Wire Cloth Products Inc Bellwood NI Automatic Metal Products Co Brookiyn N Y Worcester Pressed Aluminum Corp C eels ER 2 Worcester Maas Magnecraft Electric Co TY Chicago Ill George A Philbrick Researchers Inc E ee Boston Mass Alco Elect Mig Co Lawrence Mass Fla Allies Products Corp Diania Continental Connector Corp Woodside N Y Leecraft Mfg Co Inc Long Island N Y National Coil Co Sheridan Wyo Vitramon Inc Bridgeport Conn Gordos Corp Bloomfield N J Methode Mfg Co Rolling Meadows DL Arnold Engineering Co Marengo Il Dage Electric Co Inc Franklin Ind Siemon Mfg Co Wayne DL Weckesser Co 2 Chicago It Microwave Assoc West Inc Sunnyvale Cal Code 96095 96256 96296 96396 96330 96341 96501 96508 96733 96881 97404 97539 97979 97983 98141 98159 98220 98278 98291 98376 99410 98731 98734 98821 98978 99109 99313 99378 99515 99707 99800 99848 99928 99934 99942 99957 Manufacturer Address Hi Q Div of Aerovox Corp Olean N Y Thordarson Meissner Inc Mt Carmel Dl Solar Mfg Co Los Angeles Cal Microswitch Div of Minn Honeywel Freeport Ill Carlton Screw Co rara Microwave Associates Inc Burlington Mass Excel Transformer Co epe Oakla
132. s g s n n n sg Cen gek A ER ie aan ee ao 9 99m92 i t1 r ng GENEE AE printed circuit REES picofarad s 10 12 ech V OHS peek inverss voltage vacw alternating current working voltage 9Vo3Y 4 E E vo P rot T b b ret var o9 eee ee 5 9 o9 v d P 9 9 9 M9 3 5 Bo o3 wod onpaso o e ros nona aa e go o PUMAS VODCW o 01 065 lt o 0 sd oka RR ds SA AAA O H to peak poe oa o 2 8 9 3 9 meee 4 vo a c9 oc 9 v peek amp 4 9 cod d XO 9 D OA P4 s 9 DONE 9 o9 vod o c o3 sn ov long term stability and or tolerance DN NNN do 4 E a do e Po v I ta ba a dod oa Uo o6 o 4X1 22 72 Po gt 94 Ee Optimum value selected at factory r n eae rotary average value shown part may be omitted LER E UEM no standard type number assigned Pb selenium selected or special ty pe Dupont de Nemours STD 8 2734 Vua Seege dE terminal strip AA de ARAS A microcircuit vacuum tube neon bulb photocell etc cable Et the SO SOR P amp a a a e e wl 9 9 dos 4 amp amp 9 amp q 4 v ov op o ov ee 9 Pow P 9 P 4 4 e 4 o9 4 5 P 9 P9 4 ba v eo dO 8 9 9 9 9 P od 9 OR 9 voa i A ta Vents eee P9
133. ss than 10 of SET LEVEL indication set MODE switch to AUTOMATIC If fundamental cannot be manually nulled below 10 of SET LEVEL indication automatic mode cannot be used Set METER RANGE switch down scale to obtain on scale meter indication Observe distortion either in percentage or dB as indicated by meter deflection and METER RANGE switch setting For example if meter indicates 0 4 and METER RANGE setting is 1 distortion measured is 0 4 of fundamental Similarly if meter indicates 6 dB and METER RANGE setting is 40 dB distortion measured is 46 dB from funda mental If desired rms voltage of input signal canbe measured by setting FUNCTION switch to VOLTMETER and setting METER RANGE Switch to obtain an on scale indication Section III 3 21 DISTORTION MEASUREMENT OF AM RF ARRIF RS A C RIERS 354A only DO NOT EXCEED MAXIMUM INPUT VOLTAGES LISTED ON REAR PANEL Turn instrument on and mechanically zero meter according to procedure in Paragraphs 3 15 and 3 16 Set NORM R F DET switch to R F DET Connect input signalto R F INPUT terminal on rear panel Refer to Paragraph 3 19 for manual distort ion measurement refer to Paragraph 3 20 for automatic distortion measurement NOTE If no meter deflection can be obtained with an RF input diode A4CR1 should be checked A spare diode is located on the outside of the A4 shield 3 22 VOLTAGE MEASUREMENT a C e
134. sso Mich 63743 Ward Leonard Electric Co Mt Vernon N Y 64959 Western Electric Co Inc New York N Y 65092 Weston Inst Inc Weston Newark Newark N J 66295 Wittek Mfg Co Chicago Ili 66346 Minnesota Mining amp Mfg Co Revere Mincom Div St Paul Minn 70276 Allen Mfg Co Hartford Conn 70309 Allied Control New York N Y 70318 Allmetal Screw Product Co Inc ske Aa ee e eid Garden City N Y 70417 Amplex Div of Chrysler Corp Detroit Mich 70485 Atlantic India Rubber Works Inc Chicago Ill 70563 Amperite Co Inc Union City N J 70674 ADC Products Inc Minneapolis Minn 70903 Belden Mfg Co Chicago Ill 70998 Bird Electric Corp Cleveland Ohio 71002 Birnbach Radio Co New York N Y 71034 Bliley Electric Co Int Erie Pa 11041 Boston Gear Works Div of Murray Co of Texas Quincey Mass 71218 Bud Radio Ine Willoughby Ohio 71279 Cambridge Thermionics Corp Cambridge Mass 71288 Camloc Fastener Corp Paramus N J 11313 Cardwell Condenser Corp a aS KARETKA Lindenhurst L 1 N Y 71400 Bussmann Mig Div of McGraw Edison Co St Louis Mo 71436 Chicago Condenser Corp Chicago Ill 71447 Calif Spring Co Inc Pico Rivera Cal 71450 CTS Corp Ind 71468 ITT Cannon Electric Inc Los Angeles Cal 71471 Cinema Div
135. stomer assistance agreements are available for Hewlett Packard products For any assistance contact your nearest Hewlett Packard Sales and Service Office Addresses are provided at the back of this manual 10 1 79 HEWLETT Bech SAFETY SUMMARY The following general safety precautions must be observed during all phases of operation service and repair of this instrument Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design manufacture and intended use of the instrument Hewlett Packard Company assumes no liability for the customer s failure to comply with these requirements This is a Safety Class 1 instrument GROUND THE INSTRUMENT To minimize shock hazard the instrument chassis and cabinet must be connected to an elec trical ground The instrument is equipped with a three conductor ac power cable The power cable must either be plugged into an approved three contact electrical outlet or used with a three contact to two contact adapter with the grounding wire green firmly connected to an electrical ground safety ground at the power outlet The power jack and mating plug of the power cable meet International Electrotechnical Commission IEC safety standards DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE Do not operate the instrument in the presence of flammable gases or fumes Operation of any electrical instrument in such an environment constitutes a definite s
136. ther when making low level measurements These terminals are isolated from each other by 1 ohm which reduces the effects of common mode voltages 3 4 Model 333A 334A 3 30 333A 334A WITH OPTION 01 3 31 Operating procedures for the 333A 334A with Option01arethe same as for the standard instrument The only difference between the standard and optional instrument is that the Option 01 has a special meter and meter amplifier which is compensated to respond to VU volume unit characteristics 3 32 MANUAL NULLING 3 33 Since the frequency and balance controls are rather sensitive in the MANUAL mode the following information is supplied to simplify nulling the 3334 334A in the MANUAL mode When nulling the 333A 334A in the MANUAL mode connect the equip ment as shown below and adjust the 333A 334A fre quency and balance controls for the waveform shown in step a below Additional waveforms are provided to simplify nulling a wwe No harmonic distortion Frequency and balance adjustment correct b vA Frequency and balance control im properly adjusted Frequency approximately correct balance incorrect Balance approximately correct fre quency incorrect E e OO Second harmonic predominant fre 7 oM 0700 quency and balance adjusted Second harmonic predominant fre quency and balance adjusted phase changed Second harmonic predominant fre quency and balance adjusted phase changed
137. tifies the coun try in which the instrument was manufactured If the serial prefix of your instrument differs from the one on the title page of this manual a change sheet will be supplied to make this manual compatable with new er instruments or the backdating information in Appen dix C will adapt this manual to earlier instruments All correspondence with Hewlett Packard should in clude the complete serial number Specifications Fundamental Input Greater Than 30 V 10095 0 3 0 196 Elimination Characteristics Fundamental Rejection 80 dB Second Harmonic ccuracy for a fundamental of 5 Hz to 20 Hz better than 1 dB 20 Hz to 20 kHz better than 0 6 dB 20 kHz to 100 kHz better than 1 dB 100 kHz to 300 kHz better than 2 dB 300 kHz to 600 kHz better than 3 dB 1 1 Section 1 Table 1 1 Distortion Introduced by Instrument gt 70 dB from 5 Hz to 200 kHz gt 64 dB from 200 kHz to 600 kHz Meter indication is proportional to the aver age value of a waveform FREQUENCY CALIBRATION ACCURACY Better than 45 from 5 Hz to 300 kHz Better than 10 from 300 kHz to 600 kHz INPUT IMPEDANCE Distortion Mode 1 MQ 5 shunted by 70 pF Voltmeter Mode 1 MN 5 shunted by 30 pF 333A only 1 MN 5 shunted by 35 pF 334A only 1 to 300 V ranges 1 MN 5 shunted by lt 70 pF 300 u V to 0 3 V ranges INPUT LEVEL FORDISTORTION MEASUREMENTS 0 3 V rms for 100 set level up to 300 V may
138. tor ing output of meter circuit 10 Frequency vernier provides fine adjustment of frequency dial METER RANGE switch selects full scale range of meter in percent dB and rms volts Figure 3 1 3 0 Model 333A 334A CAUTION venna Mn A NM DSENSITIVITY selector provides 0 50 dB attenu ation of input signal in 10 dB steps in SET LEVEL and DISTORTION functions SENSITIVITY VERNIER control provides fine adjustment of sensitivity setting 14 Mechanical zero adjust provides mechanical zero adjustment of meter 15 FUNCTION switch selects type of operation of instrument 16 Shorting bar connects circuit ground to chassis ground 1 INPUT terminals provide connections for input signal 18 NORM RF DET Model 334A only selects front panel INPUT or rear panel RF INPUT connector 19 RF INPUT connector Model 334A only provides input connection for AM RF carrier input signal 20 FUSE provides current overload protection for instrument circuits Line voltage switch sets instrument to operate from 100 V 120 V 220 V 240 V Ac power connector provides input connection for ac power Front and Rear Panel Description Model 333A 334A Section III SECTION III OPERATING INSTRUCTIONS 3 1 INTRODUCTION 3 2 The Models 333A and 334A Distortion Analyzers measure total harmonic distortion of fundamental fre quencies from 5 Hz to 600 kHz harmonics upto 3 MHz are included The sharp elimination char
139. tor 100 kN 1 2 w 5 metal flm OR Resistor 600 2 1 4 W 0 5 metal film Washer int lock Spacer 6 32 threaded Shield Screw bind head 6 32x 1 4 in 0757 1037 2190 0007 0380 0058 1251 1073 2470 0001 Figure 5 7 Shielded Load Assembly c Set high frequency signal generator to 1 MHz at an amplitude of 3V Modulate high fre quency signal generator output 30 at 1 kHz using a test oscillator d Adjust 334A SENSITIVITY controls for 0dB meter indication e Set 334A FUNCTION switch to DISTORTION f Adjust 334A frequency dial vernier and bal ance controls for minimum meter indication g Distortion should be more than 40 dB below OdB reference 5 23 ADJUSTMENT AND CALIBRATION PROCEDURE 5 24 The following is a complete adjustment and calibration procedure for the 333A and 334A Before proceeding with these adjustments the Performance Checks should be performed to determine whether adjustments are necessary If your instrument does not meet the test limits specified inthe following steps refer to Troubleshooting Procedure Paragraph 5 34 Adjustment locations are shown in Figure 5 8 5 25 The adjustment and Calibration Procedure is performed with the ac power cord connected to nomi nal line voltage 115 V 230 V 48 to 66 Hz MODE switch to MANUAL HIGH PASS FILTER TO OUT and NORM R F DET switch to NORM unless other wise specified 5 206 POWER SUPPLY AND BIAS ADJUSTMENTS a R
140. ucts ET EE ER Hawkesbury Ontario Canada 36287 Cunningham W H amp Hill Lid 22395 Toronto Ontario Canada 37942 P R Mallory Co Inc lis Ind 39543 Mechanical Industries Prod Co Akron Ohio 40920 Miniature Precision Bearings Inc Keene N H 40931 Honeywell Inc Minneapolis 42190 Muter Co ENEE Chicago Il 43990 CA Norgren Co Englewood Colo 44655 Ohmite Mfg Co Skokie fl 46384 Penn Eng 4 M g Corp Doylestown Pa 47904 Polaroid Corp Cambridge Mass 48620 Precision Thermometer amp Inst CO os vx tes Southampton Pa 49956 Microwave amp Power Tube Div Waltham Mass 52090 Rowan Controller Co Westminster Md 52983 HP Co Med Elec Div Waltham Mass 54294 Shallcross Mfg Co Selma N C 55026 Simpson Electric Co Chicago DI 55933 Sonotone Corp Elmsford N Y 55938 Raytheon Co Commercial Apparatus System Div So Norwalk Conn 56137 Spaulding Fibre Co Inc Tonawanda N Y 56289 Sprague Electric Co North Adams Mass 58474 Superior Elect Co Bristol Conn 59446 Telex Corp gt gt ree ed Tulsa Okla 59730 Thomas amp Betts Co Elizabeth N J 60741 Triplett Electrical Inst Co Bluffton Ohio 61775 Union Switch and Signal Div of Westinghouse Air Brake Co Pittsburgh Pa 82119 Universal Electric Co Owo
141. ve measurement rather than in dBm absolute measurement Zero dB on the 333A 334A corresponds to 0 3 volt range rather than the 1 volt range This allows a 10 dB greater dynamic range of distortion measurements 3 25 E measurements are to be made in dBm 10 dB must be subtracted from the METER RANGE setting Thus 0 dB becomes the 10 dBm range for absolute power measurements Zero dBm is equal to 1 milli watt dissipated by any impedance andinthis particular case is 600 ohms The 10 DECIBELS marking on the meter face indicates that when voltmeter measurements are being made the indication METER RANGE plus meter indication is 10 dB greater than when power dBm measurements are being made 3 26 In short when distortion and voltage measure ments are being made utilizethe instrument METER RANGE and meter scale as they exist For absolute power measurements in dBm simply subtract 10 dB from the METER RANGE setting 3 27 USE OF OUTPUT TERMINALS 3 28 In VOLTMETER and SET LEVEL functions the 333A 334A can be used as a low distortion wide band amplifier A portion of the meter input 0 1 V rms open circuit for full scale meter deflection is provided at the OUTPUT terminals 3 29 In DISTORTION function the distortion 0 1 V rms open circuit for full scale deflection is provided at the OUTPUT terminals for monitoring purposes NOTE The INPUT terminal and the OUTPUT v terminal should not be connected directly toge
142. when it is necessary for the user to refer to the instruction manual in order to protect against damage to the instrument Indicates dangerous voltage terminals fed from the interior by voltage exceeding 1000 volts must be so marked Protective conductor terminal For protection against electrical shock in case of a fault Used with field wiring terminals to in dicate the termina which must be connected to ground before operating equipment Low noise or noiseless clean ground earth terminal Used for a signal common as well as providing protection against electrical shock in case of a fault A terminal marked with this symbol must be connected to ground in the manner described in the installation operating manual and before operating the equipment Frame or chassis terminal A connection to the frame chassis of the equipment which normally includes all exposed metal struc tures Alternating current power line Direct current power line Alternating or direct current power line The WARNING sign denotes a hazard It calls attention to a pro cedure practice condition or the like which if not correctly per formed or adhered to could result in injury or death to personnel The CAUTION sign denotes a hazard It calls attention to an operating procedure practice condition or the like which if not correctly performed or adhered to could result in damage to or destruction of part or all of the product The
143. with 333A 334A input 333A 334A meter indication should be be tween 85 mV and 95 mV This verifies an input resistance of 1 MQ 5 in set level and distortion functions 5 17 CAPACITANCE CHECK a g 9 6 Connect 502 output of test oscillator term inated in 509 load and 10 kQ resistor to 333A 334A as shown in Figure 5 5 Connect the resistor lead to the INPUT terminal of the 333A 334A and insert the other lead directiy into the 502 load Connect the ground lead from the 333A 334A to the outer shield of the 50 load do not use an adapter as it would add capacitance Set 333A 334A controls as follows FUNCTION e VOLTMETER SENSITIVITY MAX SENSITIVITY VERNIER MAX METER RANGE 1 VOLT Set test oscillator to 100 Hz and adjust amp litude for 333A 334A meter indicationof 1V Set a reference on meter of test oscillator and use amplitude control to maintain set reference whenever frequency of oscillator is varied Increase frequency of test oscillator to 540 455 kHz 333A 334A meter indication should be 0 707 V or greater verifying an input capacitance of 30 35 pF or less on 1 V range in voltmeter function Set 333A 334A METER RANGE switch to 0 1 V range Set test oscillator to 100 Hz and adjust amp litude for 333A 334A meter indication of 0 iV Set a reference on meter of test oscillator and use amplitude control to maintain s

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