HP-500A-Manual-sn-2315 电路图.pdf

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1、 HP Archive This vintage Hewlett Packard document was preserved and distributed by www. Please visit us on the web ! On-line curator: Glenn Robb This document is for FREE distribution only! RadioFans.CN 收音机爱 好者资料库 INSTRUCTIONANDOPERATINGMANUAL FOR MODEL500A ELECTRONIC FREQUENCYMETER Serial2315andAbo

2、ve APLIEDPHYSICSSTAF, lUDNTIOANDCERTIFICATIOGROUP COpyDONOTREMOVEFROM ORV HEWLETT-PACKARDCOMPANY 395PAGEMILLROAD.PALOALTO.CALIFORNIA.UoS.A. RadioFans.CN 收音机爱 好者资料库 GeneralDescription TheModel500AFrequencyMeterdirectlymeasuresthefrequencyofan alternatingcurrentvoltagefrom5to50,000cycles/sec.Itwillope

3、ratewith theinputvoltageaslowas.5volts.Variationoftheinputvoltagefrom.5to 200voltsorvariationoflinevoltagefrom105to125voltshasverylittleeffect ontheaccuracyoftheinstrument. Thisinstrumentisusefulformeasuringthebeatfrequencybetweentwo radiofrequencysignals,crystalfrequencydeviation,audiofrequencies,a

4、nd formeasuringthespeedofrotatingmachinerywhenusedinconjunctionwitha phototubeandalightsource. CAUTION THEMAXIMUMVOLTAGEAPPLIEDTOTHEINPUTTERMINALSOFTHIS INSTRUMENTMUSTNOTEXCEED600VOLTS,THESUMOFTHEDCVOLTAGE ANDTHEACPEAKVOLTAGE.HIGHERVOLTAGESWILLBREAKDOWNTHE CAPACITORINTHEINPUTCIRCUITOFTHISINSTRUMENT.

5、 PartsSubstitutions Difficultiesinprocuringsomeofthepartsusedinthisinstrumentmay causetheelectricalorphysicalvaluestodeviatefromthoseshowninthisin- structionmanual.Thesesubstitutionshavebeenmadesoasnottoimpairthe performanceofthisinstrument.Wheneverreplacementofanyoftheseparts isnecessary,eitherthes

6、ubstitutevalueortheoriginalvaluemaybeused. u c c RadioFans.CN 收音机爱 好者资料库 . : o .,l:j .() r- .-4 . til . I- SwitchPosition USE LINEFREQ. -2- Function Themeterisconnectedto indicatefrequencyandthe INPUTterminalsareconnected totheinputoftheamplifier. Themeterisconnectedto indicatefrequency.The6.3V. CAL

7、IBRATE secondaryofthepower transformerisconnected acrosstheinputofthe amplifierinordertomeasure thepowerlinefrequencyasa checkontheinstrument calibration. Themeterisconnectedasa DCmilliametertomeasurethe currentdrawnbytheswitching tubes(V4,.V5).Thecurrent isadjustedsothatthemeter pointercoincideswit

8、hthe calibrationmarkonthemeter scale.Theamplifierinput isshortcircuitedwhenthe switchisinthisposition. RANGE_Thisswitchisusedtoinsertthecorrectcouplingcapacitorsand metershuntresistorsinthecircuitforanydesiredrangeoffrequencymeasure- ment. CALIBRATE-Thiscontrolisusedtoadjustthecurrentdrawnbythe swit

9、chingtubes. RECORDER-TheRECORDERjackisprovidedforconnectingarecorder totheinstrument.ThisinstrumentisdesignedtodriveanEasterline-Angus AutomaticRecorder.However,otherrecordersmaybesubstitutediftheir resistanceis1400ohms100ohmsandafullscaleindicationcanbeobtained withacurrentofonemilliampere. ON-OFF-

10、Thistoggleswitchcontrolsallthepowersuppliedtothe instrumentfromthepowerline. FUSE-Thefuseholder,locatedonthebackoftheinstrument,contains a 1amperecartridgefuse.Toreplacethefuse,unscrewthefuseholdercapand removetheblownfuse,insertanewfuseofthesametypeandreplacethefuse- holdercap.For230voltoperationth

11、isfuseshouldhavea1/2ampererating. ReplacementfusesmustbeoftheSlo-BlotypeasspecifiedintheTableof ReplaceablePartsinthisinstructionmanual. PowerCable-Thisisaspecialthreeconductorpowercablewitha standardtwoprongmaleplugmoldedononeend.Thethirdconductor(green) protrudesfromthepowercableneartheplugandmayb

12、eusedtoconnectthe instrumentchassistoanexternalground. -3- Operation- Theprocedureformeasuringfrequencyisasfollows: 1.TurnthepowerswitchtoONandallowtheinstrumenttowarmupfor twoorthreeminutes.Ifmaximumaccuracyisdesired,measurementsshould notbemadeuntiltheinstrumentiscompletelywarmedup. 2.SettheUSE-LI

13、NEFREQ.-CALIBRATEswitchtotheCALIBRATE position.AdjustheCALIBRATEcontrolsothatthemeterpointercoincides withthemeterscaledivisionlabeledC-locatedatapproximately85onthe 0-100meterscale.Thisstepintheprocedurecalibratestheinstrument.The calibrationshouldberecheckedoccasionallywhilemakingmeasurements. 3.S

14、ettheRANGEswitchtothe100range.ChangetheUSE-LINE FREQ.-CALIBRATEswitchtotheLINEFREQ.position.Thefrequencyofthe powerlinevoltageisindicatedbythemeter.Thismeasurementservesasa checkonthecalibrationoftheinstrmnent. CAUTION NoexternalvoltageshouldbeappliedtothelOputterminalswhenthe powerlinefrequencyisbe

15、ingmeasured.Applicationofexternalvoltagemay causeinaccuratelinefrequencymeasurements. 4.ChangetheUSE-LINEFREQ.-CALIBRATEswitchtotheUSEposi- tionandapplythevoltagetobemeasuredtotheINPUTterminals.Setthe RANGEswitchtocoverthefrequencybeingmeasured.Iftheapproximate frequencyisunknown,turntheRANGEswitcht

16、othehighestfrequencyrange. Changetheswitchtosuccessivelylowerrangesuntilarangeisfoundthatpro- ducesareadablemeterindication. 5.Whilethemeterisindicatingthefrequencybeingmeasured,depress andholdintheTESTbutton.Ifthemeterindicationisunchangedbythistest, thenthereissufficientinputvoltagefortheinstrumen

17、ttoproduceanaccurate frequencymeasurement.Insufficientinputvoltage,asshownbyalowered meterindicationwhentheTESTbuttonispressed,willcauseinaccuratefre- quencymeasurements. AttachingaRecordertoheModel500A- WhenarecorderisusedwiththeModel500A,itisnecessarythatthe compensatingresistorintheinstrumentbead

18、justedsothattheresistanceof therecordermatchestheinstrument. Thisadjustmentismadeasfollows: 1.Warmuptheinstrumentandmeasureeitherthepowerlinefrequency orthefrequencyofanaudiooscillator.Notethefrequencyindicatedbythemeter. -4- J1 o o :X:- Ct:l (1) . III . n- o l.C) -D r- . . cd . M Q) U) 2.Plugthelea

19、dfromtherecorderintotheRECORDERjack.Ifthe meter(MI)indicationisnotthesameasnotedinstepI,adjustR56(SeeFig. 4)soastoproducethesameindicationasinstep1.Whentherecorderisdis- connectedfromtheRECORDERjack,resistorR56isremovedfromthecircuit andR53substitutedsothattheaccuracyoftheModel500Aisnotimpaired. Usi

20、ngtheModel500AasaTachometer- TheModel500Amaybeemployedasatachometerbyconnectingasuit- ablephototubetotheinstrument.Asourceoflighttobereflectedintothephoto- tube,byatargetpaintedontherotatingmachinerybeingmeasured,mustalso beprovided. Theabovementionedphototubeandlightsourcehavebeencombinedinto oneas

21、semblyandmaybepurchasedfromtheHewlett-PackardCo.Thisacces- soryiscalledaModel506ATachometerHeadAssembly. ZeroMeterIndication-Tlemeterpointermaynotcoincidewiththezero scalerllar n- o . IRECORDERI 115/230V 50/60ru TUBEV6 POWERSUPPLY .- TUBESV7,VB ItI L-I-f II t I r-J CONSTANTCURRENT REGULATOR PULSECOU

22、NTER ELECTRONIC CIRCUIT LIMITINGAMPLIFIERSWITCH C9-C2B j, TUBESVI,V2,V3 r- TUBESv4,V5 RECTIFIERS CR1 -CR4 J I I II vI v - o IPHOTOTUBEI IINPUTI Fig.1.Model500ABlockDiagram o ., . . J.l (l) U) -ex: o o t) , Maintenance CoverandBottomPlateRemoval-= Thebottomplateisremovedbyunscrewingthefourscrews,onei

23、neach cornerofthebottomplate.whichfastentheplatetothechassis. Thecoverisremovedbyunscrewingtheeightscrewswhichfastenthe covertothebakandtopoftheinstrument. TubeReplacement- AnytubehavingRTMAstandardharacteristicsmaybeusedforreplace- mentpurposesinthisinstrument. HumBalanceAdjustment(R55)- Theadjustm

24、enofthevariableresistorforbalancingouttheunwanted 60currentisasfollows: 1.Measureandnotethepowerlinefrequency.ShieldtheINPUTtermi- nalsoftheinstrument.Ashieldeddoublebananaplugissatisfactory. 2.SettheUSE-LINEFREQ.-CALIBRATEswitchtoUSEandtheRANGE switchtothe50position. 3.AdjustR55,locatedunderneathth

25、echassisandreachedbyremoving thebottomplate(SeeFig.4),forminimummeter(Mlindication. 4.Measurethelinefrequencyandcomparewithpreviouslinefrequency measurement.Iftheyarenotthesame,re-adjustR55slightlytoonesideso thatthelinefrequencyiscorrect. FrequencyCalibrationAdjustment Theonlycalibrationadjustmentt

26、hatshouldbeperformedinthefieldis theadjustmentofthemetershuntresistorsR34toR43.Ifanyofthecoupling capaciorsC9toC28areaffectingthecalibration,theinstrumentshouldbere- turnedtohefactoryforadjustment. Theprocedureforadjustingtheshuntresistorsisasfollows: 1._Warmuptheinstrumentandsetthecontrolsforfreque

27、ncymeas- urement. 2.StartingwiththeRANGEswitchatthe50position,applya50 voltagetotheINPUTterminalsoftheinstrument.Thisvoltageshouldbeob- tainedfromasecondaryfrequencystandardorsomeothersourceofaccurate frequencies.Ifthemeterdoesnotindicaeexactlyfullscale,thenadjustthe valueoftheshuntresistorR34bysubs

28、titutinganotherresistororbyconnec- tingahghresistancelnparallelwithR34. -7- 3.Repeatstep2for10012001,andetc.usingacalibrationvoltagewhose frequencyisequaltothefullscalefrequencyofeachrange.Adjusttheshunt resistorwhichcorrespondstotherangebeingcalibrated. Adjus Theproedureforadjusingheonstancurrentre

29、gulatorcircuitisas follows: 1.WarmuptheinsrumenusingU5Vlinevolage.SettheUSE-LINE FREQ.-CALIBRATESWlch0CALIBRATE.AdjusttheCALIBRATEcontrolso hatthemeerindicaesexactly80onthe00100scale. 2.Changethelinevoltageto105volsandnotethemeterindiation. Repeaa125volslinevolage.Ifhemeerindicationdoesnochangemore

30、thanl%offullscale(80.5to79.5).entheregulatorcircuitisfunctioning satisfactorl1y. 3.IfhemeterindicatlOnisotwithinhespecifiedlimis.thenanew OD3tubeV8)and/oranew6L6tube(V7)shouldbetried.TheOD3ubeshould beagedbyoperatingitforeighhoursWlh150voltsappliedacrossi stermi- nals.Theeasiestway0agetheubeis0puiti

31、nitssocketintheinstrument andlettheinstrumentoperaeforeighhours. Ifchangingtubesdoesnotresoreheregulatorcircuittonormal.then additionaladjusmenswillbenecessary. 4.Withhelinevoltageat115olts.settheUSE-LINEFREQ.-CALI- BRATEswithatCALIBRATE.SetheCALIBRATEconroltoproduceameer indicaion080.henhangeheUSE-

32、CALIBRATEswitch0USEandapplya 50,000cycles/sec.voltage0theINPUTterminals.Noehemeerindication. 5.AdjustR6l.(SeeResisorBoardDetailRBI,Fig.5)byconnetinga resisorinparallelwihR6lorbysubstituinganewresistorofhighervalue, sothathemeerdoesnovarymorehanl%offullscalewhenthepowerline voltageisvariedfrom105to12

33、5vols. Ul o o m ,. t . III . . -J 0 Ul 6.Without andinpufrequency powerlinevolage. variationsfromhe less,hecircuitis hangingheCALIBRATEconraj.changetheRANGEswitch o1000cycles/sec.Notethmeerindicationwith115volts ChangepowerIievoltageto105and125voltsandnoteany indicaioobtainedat115volts.Ifthevariatio

34、nis1%or orreclyadjusted. However.ifhevariaionismrehan1%thenthevalueofR61should bechangedsoas0obainthebescompromisebetweenthe1000and50.000 cycles/sec.adjustmens. -8- R34* ,CRl 1 u co3 :., 5 10530 IOANGE! 1.(50,1 2.ILINEFREQ.!2.110011 3.ICALIBRATEI3.!zoo-vi 4.!500I 5.E:TIJ 6.II!IJ 7.rr:m 8.l:I:ill 9.(

35、1Iill 10. 035 !F G.9 53C . 53A 53B G9 fr 2GO .1u.F t. ,l t- 5000 -1(- G5 r- . G8 200 fr 2 G20 . ,f2t riG23 OlJlF r-1(.I C24 5000 -l-. G25 L; 19 y 500 G28 200 033 5000 032 5000 .r-Q)- R43I rer- 421.fJJ6I;OYO R41l:R31 04039038 J.jjI 1$ 28 00K ,.240:.:4 5_ V53-60 6V6 V4 66+J60 51 22K, =4 R298 2201:5K11

36、 O1+6 1/60 va DD3 V2 65J7 46 10K 045 1001 061 100I 56K Vl 65H 058 OOK R9.LC31 fOO+120jJ.F 0 t- !.2!.i.:. CONDITIONSOFDCVOLTAGEMEASUREMENT I.LINEVOLTAGE,115-230VOLTS,50-601. 2.CALIBRATETHEINSTRUMENT. 3.RANGESWITCHON100. 4fUNCTIONSELECTORON1INEfREQUENCY. NOEXTERNALCONNECTiONSTOTHEINSTRUMENT. 6VOLTAGES

37、MEASUREDBETWEENINDICATEDPOINTS8CHASSlS WITHAVACUUMTUBEVOLTMETERWITH122 MEGOHMSINPUT RESISTANCE(HPMODEL41081. COND1TIONSOFACVOLTAGEMEASUREMENT 1.THRU5.SAMEASDCCONDITIONS. 6VOLTAGEStolEASUREDBETWEENINDICATEDPOINTSWtTHANACMETER Of1000OHMSIVOLTORGREATERSENSITIVITY. ALLCAPACITANCEVALUESINIJ.JJFUNLESSOTHE

38、RWISENOTED. ALLRESISTANCEVALUESINOHMSUNLESSOTHERWISENOTED. II1000OHMS,I Ma1 MEGOHMitADJUSTEDATFACTORYFOROPTIMUMPERfORM -:h-CHASSISANCE.AVERAGE VALUESHOWNPARTMAYBE -OMtTTED. 05 120K 2-, 24 ;.OMI 25 5K 33K 23 2701V3 V7 I VlV2 oITmI 52 03 470I( G .qJ.F J6!:OWNfV4V5 BROWN72 E IKII I017 I 0.9 22 22K33K 1

39、0104 07 I R16 410K470It:6.BM560560 022 -l.-G2B 6 II 560 1000 TtOIJ.F 51AQ- y. -D L1 -1 BROWN T, PRI.1 230V 50-60 BLUE PRI.2 WHITE DETAIL 6 1INPUTI 0 PHOTOTUBEI ION-OFF!FUSE! 054? PI/-.LSEE TRANS DETAIL = -r- I SCHEMATICDIAGRAMOFMODEL SERIAL 2315aABOVE. 500A . N. 00 . t:. Fl C7 . o TABLEOFREPLACEABLE

40、PARTS o ., Circuit Ref. R29 R30 R31 R32pR33 R34-R43 R44 R45 R46 R47 R48 R49 R50 R51 R52 R53 R54 R55 Description Resisor:flxedpcompositionp 220,000ohmsp 10%p 1 W Resistor:fixedpcomposibonp 270p000ohmsp 10%p 1W Resistor:ftxedpcomposibon, 22p000ohms,10%p1W Resistor:fixed.wirewound, 5000ohms,10%p20W Ele

41、ctricalvalueadjustedafactory Resistor:ftxed,composition, 33ohms,10%.1W Resistor:flxed,composibon, 100,000ohmsp 10%p 1W Resistor:fixed,wirewoundp 10,000ohms,10%,27W Resistor:fixed,wirewoundp 5000ohmsp10%,20W Resistor:ftxed,composition, 33,000ohms,10%,1 W Resistor:variable,composition, 25,000ohmspline

42、artaper Resistor:fixedpcompositionp 82,000ohmsp10%,1 W Electricalvalueadjustedatfactory Resistor:variable,wirewound, 100ohms,lineartaper Resistor:fixed,wirewound, 1000ohmsp10%,1W Resistor:fixed,compositionp 1500ohms.1%,1W Resisto:fixedpcompositionp 56,000ohmsp10%,1W ReSistor:variable.wirewound, 50oh

43、ms,10%p 3W -hp- StockNo. 24-22K 27=3 24-33 24-100K 27-4 27-3 24-33K 210-54 24-82K M-80 26-15 31-1500 24-56K 210-2 Mh.atMfrs. Designation B GB2241 B GB2741 B GB2231 S Type2R B GB3301 B GB1041 S Type2R S Type2R B GB3331 B B HP R TypeBW-l GG TypeCP-1 B GB5631 G #21-010-067 *SeeListofManufacturersCodeLettersForReplaceablePartsTable.II -12= TABLEOFREPLACEABLEPARTS Circuit Ref. R56 Description Resistor:variable,wirewound. 300ohms,lineartaper -hp- StockNo. 210-53 Mh.,6rnryj;Srl1mfltlrJprpJmiffJrrurucy 395PAGEMILLROAD!.!.pPALOALTO.CALIFORNIA ,