HP-500A-Manual 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 RadioFans.CN 收音机爱 好者资料库 ; CERTIFICATION THEHEWLETT-PACKARDCOMPANYCERTIFIES THATTHISINS

2、TRUMENTWASTHOROUGHLY TESTEDANDINSPECTEDANDFOUNDTO MEETITSPUBLISHEDSPECIFICATIONSWHEN ITWASSHIPPEDFROMTHEFACTORY. 0;)FURTHERCERTIFIESTHATITSCALIBRATION MEASUREMENTSARETRACEABLETOTHE NATIONALBUREAUOFSTANDARDSTOTHE EXTENTALLOWEDBYTHEBUREAUSCALI- BRATIONFACILITY. RadioFans.CN 收音机爱 好者资料库 MANUALCHANGES MO

3、DEL500A ELECTRONICFREQUENCYMETER nualSerial2589t N . Itl - . ro . H (l) U) . 2.PlugtheleadfromtherecorderintotheRECORDERjack.Ifthe meter(Ml)indicationisnotthesameasnotedinstep1,adjustR56(SeeFig. 4)soastoproducethesameindicationasinstep1.Whentherecorderisdis- connectedfromtheRECORDERjack,resistorR56i

4、sremovedfromthecircuit andR53substitutedsothattheaccuracyoftheModel500Aisnotimpaired. UsingtheModel500AasaTachometer- TheModel500Amaybeemployedasatachometerbyconnectingasuit- ablephototubetotheinstrument.Asourceoflighttobereflectedintothephoto- tube,byatargetpaintedontherotatingmachinerybeingmeasure

5、d,mustalso beprovided. Theabovementionedphototubeandlightsourcehavebeencombinedinto oneassemblyandmaybepurchasedfromtheHewlett-PackardCo.Thisacces- soryiscalledaModel506ATachometerHeadAssembly. ZeroMeterIndication-Themeterpointermaynotcoincidewiththezero scalemarkwhentheinstrumentisnotoperating.Them

6、eterpointeriscorrectly adjustedandtheadjustmentscrewsealedatthefactory. -5- CircuitDescription TheModel505A(or505B)ElectronicTachometerIndicatorconsistsof alimitingamplifier,anelectronicswitch,apulsecountercircuit,aconstant currentregulator,andapowersupply. Theincomingvoltageofunknownfrequencyisappl

7、iedtothegridofVI, thefirststageofthelimitingamplifier(tubesVI,V2,V3).TubesVIandV2 amplifyandflattenthepeaksoftheincomingvoltage.TubeV3isaphaseinverter. ThesquarewavesobtainedfromtheplatecircuitsoftubesV2andV3,op- posite.inphase,areappliedtothegridsoftubesV4andV5,whichcomprisethe electronicswitch. Th

8、espacecurrentforthetwoswitchingtubesisobtainedfromthecon- stantcurrentregulator.Theproperpairofpulse-countercapacitorsforthe desiredrangeisselectedbytheRANGEswitch,whichatthesametimeselects thepropershuntresistorforthemeter.WhenthesquarewavefromV2isin thepositivehalfofthecycle,switchingtubeV4isbiase

9、dtoconduct,andcurrent fromtheregulatorflowsthroughV4tochargeoneofthecapacitorsintheC9-C18 group.WhenthevoltageonthegridofV4becomesnegative,thewavefrom phaseinverterV3,appliedtothegridofV5,isinthepositivehalfofthecycle. SwitchingtubeV5inturnconducts,andcurrentfromtheregulatorflowsthrough V5tochargeon

10、eofthecapacitorsintheC 19-C28group.Thetimeconstantsof thetwoRCcombinations(loadresistorR33/capacitorfromC9-C18groupand loadresistorR32/capacitorfromC19-C28group)areequal.Theresistorand capacitorvaluesaresuchthat,atthehighestfrequencytobecounted,thecapaci- torwillbefullychargedbeforetheendofthehalfcy

11、cle.Theaccuratelycon- trolledpulsesfromthepairofcapacitorsareconvertedtounidirectionalpulses bycrystal-rectifiersCRl-CR4,andtheresultantcurrentflowsthroughthemeter. Themeterindicationisproportionaltothenumberofpulsesperunitoftimeand thereforetothefrequencyofthevoltageappliedtotheinputoftheinstrument

12、. ResistorsR34toR43areshunts,oneofwhich(selectedbytheRANGEswitch) isconnectedacrossthemetertoadjustthecurrentthroughthemetertothecor- 1ectvaluefortheselectedfrequencyrange. Tworesistors(R53andR56)areconnectedtocontactsoftheRECORDER jack,butonlyoneresistorisinthecircuitatanyonetime.Withthejackat norm

13、al,variableresistorR56isshunted,andresistorR53isconnectedintothe metercircuit.ResistorR53constitutesadummyloadapproximatelyequivalent totheloadarecorderpresents,andisinsertedinthecircuitwhennorecorder isconnectedtotheinstrument.WithaplugintheRECORDERjack,resistor R53isdisconnectedfromthecircuit,andr

14、esistorR56isinserted.Adjustment oftheModel505A(or505B)recordercircuittothatoftherecorderwithina 1400100ohmslimitismadebymeansofvariableresistor.R56. TheconstantcurrentregulatorconsistsoftubesV7,V8.TubeV8isa voltageregulatortubewhichmaintainsaconstantvoltageonthescreengridof tubeV7.Avoltagedivider(R4

15、8,R49,R50)isconnectedbetweenthescreen gridandground.Thevariableresistor(R49)inthisdividerisprovidedsothat thevoltageappliedtothegridofV7maybeadjustedtoproducethedesiredcon- stantcurrentfortheswitchingtubes.Thiscurrentismeasuredbyswitching themeter(Ml)acrossresistorR27intheplatecircuitoftubeV7. -6- J

16、t o o IRECORDERI 115/230V 50/1000V TUBEV6 POWERSUPPLY I!I L-I-., II t I f.-J CONSTANTCURRENT REGULATOR1- TUBESV7,va PULSECOUNTER ELECTRONIC CIRCUIT LIMITINGAMPLIFIERSWITCH C9-C28 , , TUBESVl,V2,V3 r TUBESV4,V5 RECTIFIERS CR1 -CR4 J I I I 1 Ivvt o IPHOTOTUBEI IINPUTI Fig.1.Model500ABlockDiagratn Main

17、tenance CoverandBottomPlateRemoval- Thebottomplateisremovedbyunscrewingthefourscrews,oneineach cornerofthebottomplate,whichfastentheplatetothechassis. Thecoverisremovedbyunscrewingtheeightscrewswhichfastenthe covertothebackandtopoftheinstrument. TubeReplacement- .AnytubehavingRETMAstandardcharacteri

18、sticsmaybeusedforreplace- mentpurposesinthisinstrument. MeterZeroAdjustment- Themeterzeroadjustscrewissealedatthefactoryforthebesttracking ofthemeter,andnoattemptshouldbemadetochangethisadjustment.Ifthe meterpointerdoesnotindicateexactlyonzero,theaccuracyofthemeterneed notbedoubted. CAUTION:Themetho

19、dusedbythefactorytosealthezeroadjustscrew issuchthatanyattempttomovethescrewwilldamageorbreakit. HumBalanceAdjustment(R55)- Theadjustmentforbalancingouttheunwantedpowerlinecurrentisas follows: 4.Againmeasurethelinefrequencyandcomparewiththepreviousline frequencymeasurement.Iftheyarenotthesame,readju

20、stR55slightlytoone sidetoobtainthesamemeterindicationasinstep1. FrequencyCalibrationAdjustment- Theonlycalibrationadjustmentthatshouldbeperformedinthefieldis theadjustmentofthemetershuntresistors,R34toR43.If,anyofthecoupling capacitors,C9toC28,areaffectingthecalibration,theinstrumentshouldbere- turn

21、edtothefactoryforadjustment. andnotethe Ashielded 1.Measurethepowerlinefrequency(Operation,step3), meterindication.ShieldtheINPUTterminalsoftheinstrument. doublebananaplugissatisfactory. 2.SettheUSE-LINEFREQ.-CALIBRATEswitchtoUSEandtheRANGE switchtothe50position. 3.AdjustvariableresistorR55,locatedu

22、nderneaththechassisand reachedbyremovingthebottomplate(seeFig.4,forminimummeter(Ml) indication. o o lll Theprocedureforadjustingtheshuntresistorsisasfollows: . 1.Warmuptheinstrumentandsetthecontrolsforfrequencymeas- urement. -7- 2.StartingwiththeRANGEswitchatthe50,position,applya 50, voltagetotheINP

23、UTterminalsoftheinstrument.Thisvoltageshouldbeob- tainedfrom:isecondaryfrequencystandardorsomeothersourceofaccurate frequencies.Ifthemeterdoesnotindicateexactlyfullscale,thenadjustthe valueofshuntresistorR34bysubstitutinganotherresistororbyconnecting ahighresistanceinparallelwithR34. 3.Repeatstep2fo

24、r100200,andetc.usingacalibrationvoltagewhose frequencyisequaltothefullscalefrequencyofeachrange.Adjusttheshunt, resistorwhichcorrespondstotherangebeingcalibrated. AdjustmentofCurrentRegulator- Theprocedureforadjustingtheconstantcurrentregulatorcircuitisas follows: 1.Warmuptheinstrumentusing115V(or23

25、0V)linevoltage.Setthe USE-LINEFREQ.-CALIBRATEswitchtoCALIBRATE.AdjusttheCALIBRATE controlsothatthemeterindicatesexactly80onthe0to100scale. 2.Changethelinevoltageto105(or210V)voltsandnotethemeterindi- cation.Repeatat125(or250V)voltslinevoltage.Ifthemeterindicationdoes notchangemorethanl%offullscale(8

26、0.5to79.5),thentheregulatorcircuit isfunctioningsatisfactorily. 3.Ifthemeterindicationisnotwithinthespecifiedlimits,thenanew OD3tube(V8)and/oranewbLbtube(V7)shouldbetried.TheOD3tubeshould beagedbyoperatingitforeighthourswith150voltsappliedacrossitstermi- nals.Theeasiestwaytoagethetubeistoputitinitss

27、ocketintheinstrument andlettheinstrumentoperateforeighthours. Ifchangingtubesdoesnotrestoretheregulatorcircuittonormal,then additionaladjustmentswillbenecessary. 4.Withthelinevoltageat115(or230V)volts,settheUSE-LINEFREQ.- CALIBRATEswitchatCALIBRATE.SettheCALIBRATEcontroltoproducea meterindicationof8

28、0,thenchangetheUSE- -CALIBRATEswitchtoUSEand applya50,000cycles/sec.voltagetotheINPUTterminals.Notethemeter indication. 5.AdjustR6l(SeeResistorBoardDetailRB1,Fig.5)byconnectinga resistorinparallelwithRbIorbysubstitutinganewresistorofhighervalue, sothatthemeterdoesnotvarymorethen1%offullscalewhenthep

29、owerline voltageisvariedfrom105to125(or210to250V)volts. 6.WithoutchangingtheCALIBRATEcontrol,changetheRANGEswitch andinputfrequencyto1000cycles/sec.Notethemeterindicationwith115(or 230V)voltspowerlinevoltage.Changepowerlinevoltageto105and125(or 210and250V)voltsandnoteanyvariationsfromtheindicationob

30、tainedat115 (or230V)volts.Ifthevariationis1%orless,thecircuitiscorrectlyadjusted. However,ifthevariationismorethan1%thenthevalueofR61should bechangedsoastoobtainthebestcompromisebetweenthe1000and50,000 cycles/sec.adjustments. -8- V1 o o 500A4/24/53Serial1765to TroubleShooting- Thefollowinginformatio

31、nisdesignedtoaidintroubleshootingadefectiveinstrument: Symptoms If).strumentNOT operating,pilot lightNOTon. I -.0 I InstrumentNOT operating,pilot lightON. Lowmeterindication onallranges. PossibleCause Linefuseblowndue todefectivefuseor overloadinpower supplysectionof instrument. Defectivecrystal rec

32、tifier. TestProcedure Replacefuse,ifthisfuseblowsremove v6(5Y3GT)andagainreplacethefuse. Ifthisfuseblowsitindicates: 1.Shortcircuitinwiringassociated withpowertransformer. 2.Shortcircuitinfilamentwiring. 3.Tubewithaninternalshortcircuit. 4.Defectivepowertransformer. IfthefusedoesnotblowwithV6re- mov

33、ed,itindicates: 1.DefectivefiltercapacitorC31,C7AB. DCresistancebetweenpin8onV6socket andgroundisnormally17,000ohms (approximate)andshouldbemeasured withtheinstrumentdisconnectedfrom thepowerline. 2.Shortindirectcurrentwiring. 1.Defectivetube. 2.MeasureDCvoltages.Should agreewiththoseindicatedon sch

34、ematicdiagramwithin10%. Measurethebackresistanceofeach crystalrectifier.CR1 -CR4.Back resistancemustbe30,000ohmsor greater. Remedies 1.Locateandclear shortcircuit. 2.Locateandclear shortcircuit. 3.Replacedefective tube. 4.Replacepower transformer. 1.ReplaceC3l,C 7AB ifprovendefective. 2.Locateandcle

35、ar shortcircuit. 1.Replacedefective tube. 2.Replacecomponent causingincorrectDC voltage. Replacedefective crystalrectifier. . - CR 530IRANGEl ,.IVI 100VI :5.(200JI 4.1000VI . 6. 7. 8. 9. 10. R34 CR 3 510 I. 2.-LINEFiEOJ2. I_._i R3!S* 53C +.9 53A C9 .21F C9 53B fr 2 C20 ., C21 rr; .o:C;4CR2 .02IJ.F 1

36、2:3riC23 c!.01 P.F 24 4700 -j- C20 ;. 19 Y 470 (- C2. 2f- rTf CO .1UF t .O C2 ,rr; n 4700 -H- CIO ;. tt CIB 200 (.I 033 5000 R32 5000 = *r- R43IR42,(!J:lJ036 R41*R37;t R40*R39.R38 10.11 I C 4 .qJ.F II .LC. .,.IJ.l.F R52 1000 , J.CB T50lF +400 R27 100 RB 10K C2C 10j.LF R20 .6K R26 470K C 6 q.lF 047 5

37、000 +320 R04 .6K R24 5K R23 .2IOK R20 33K R9 33K .L.-C2B -y-IOj.LF R4. 33K va 003 C7B 20llF Vl 65J7 -.:flOO +90 R58.,LC7A lOOK-T20j.LF R159.Lc31 100KT201lF R5 100 +410 R60 . CONOITIONSOFDCVOLTAGEMEASUREMENT tUNEVOLTAGE,115-230VOLTS,!K)-jOOO. 2. CALIBRATETHEINSTRUMENT. 3.RANGESWITCHON100V. 4FUNCTIONS

38、ElECTORONUNEFREOUENCY. 5NOEXTERNALCONNECTIONSTOTHEINSTRUMENT. 6VOLTAGESMEASUREDBETWEENINDICATEDPOINTS6CHASSIS WITHAVACUUMTUBEVOLTMETERWITH122MEGOHMSINPUT RESISTANCE(HPMODEL410B). CONDITIONSOFACVOLTAGEMEASUREMENT 1.THRU5.SAMEASDCCONDITIONS. 6.VOLTAGESMEASUREDBETWEENINDICATEDPOINTSWITHANACMETER OF1000

39、OHMSIVOLTORGREATERSENSITIVITY. ALLCAPACITANCEVALUESINIJ.J.lFUNLESSOTHERWISENOTED. ALLRESISTANCEVALUESINOHMSUNLESSOTHERWISENOTED. I K1000OHMS,1 M1 MEGOHM*.ADJUSTED AT FACTORYFOROPTIMUMPERFORM- CHASSISANCEAVERAGE VALUESHOWNPARTMAYBE.t:III,I T R 9 IKII IR,7 22K22K R4 II $R16 6.8M.60.60 - = RBR!57*1 t e

40、2A 5 R22 10.iF 560 1.8M . .OMI R2 10K 7777 1 cttlv7 :LACK BROWN PRI, PRI.2 =;OK=7K 1 230V 50-1000, 22 t 6.3. JGREEN?r ,YELLOW tYEllOW GREEN T I (:OWNfV4V5 BROWN72 R 6 1000 o o REO I300 lREO-iLOW :300V-=- IIc:.L.REO,.-.J T1 I I I BLACK BWE PRI.2 PRI, ! BROWN Fl!1 SEE TRANS DETr IFUSEI - 6 r IINPUTI i

41、ll 1 115V 50-1000 JI VC iiftOrOTUBE! ION-OFFI 054 PI t,WHITEOJIIIIWHITE TRANSFORMEROETAIL OMITTED o .IPANELCONTROLI SCREWDRIVERADJUSTMENT SCHEMATICDIAGRAMOF MODELSOOA iU . iU - U s: iU iU U . c: 0 . U iU . 0 0 . iU (j 0 . N btl . Pi Ll R56 C31 (, , V4ENGV2-GSJ7VI-GSJ7 C2ABC , Mt Fig.3.ModelSOOATopVi

42、ewCoverRemoved . 4 R56* R34R43 ) Fig.4.Model500ABottomViewBottomPlateRemoved r-(OPP.SIDE)-. RBI (OPP.SIDE) o o C6 .1.L1F .R22 r221 IOPPSIDE) C5j .1J.lF o o RB2 Fig.5.Model500AResistorBoardDetail ,.-tt-.,C3 .5UF o o ,.-(OPP.SIDE)I- o o - RB3 C 1(OPP.SIDE) .1JJ.F RB4 Fig.6.ModelSOOAResistorBoardDetail

43、 TABLEOFREPLACEABLEPARTS Circuit Ref. Cl C2 C3 C4, C5, C6 C7AB C8 Description Capacitor:fixed,paper, 1f,100/0,600vdcw Capacitor:fixed,electrolytic, 10,10,10IJ.f,450vdcw Capacitor:fixed,paper, .5IJ.f,100/0,400vdcw Capacitor:fixed,paper, .1IJ.f,100/0,600vdcw Capacitor:fixed,electrolytic, 20,20IJ.f,450

44、vdcw Capacitor:fixed,electrolytic, 50IJ.f,+2000/0,-100/0,50vdcw -hp- StockNo. 16-1 18-31 16-58 16-1 18-22 18-50 Mfr. , to ., J II (J ell ., . III . . C L p: ;:l l:l p: c 0 : (l TABLEOFREPLACEABLEPARTS . cd . H U) o o If) Circuit Ref. R29 R30 R31 R32,R33 R34-R43 R44 R45 R46 R47 R48 R49 R50 R51 R52 R5

45、3 R54 R55 56 Description Resistor:fixed,composition, 220,000ohms,10%,1 W Thiscircuitreferencenotassigned Resistor:fixed,composition, 560,000ohms,10%,1 W Resistor:fixed,wirewound, 5000ohms,10%,20W Electricalvalueadjustedatfactory Resistor:fixed,composition, 33ohms,10%,1 W Resistor:fixed,composition,

46、100,000ohms,10%,1 W Resistor:fixed,wirewound, 10,000ohms,10%,27W Resistor:fixed,wirewound, 5000ohms,10%,20W Resistor:fixed,composition, 33,000ohms,10%,1 W Resistor:variable,composition, 25,000ohms,lineartaper Resistor:fixed,composition, 68,000ohms,10%,1 W Electricalvalueadjustedatfactory Resistor:va

47、riable,wirewound, 100ohms,lineartaper Resistor:fixed,wirewound, 1000ohms,10%,1 W lResistor:fixed,composition, 1500ohms,1%,1 W lResistor:fixed,composition, 56,000ohms,10%,1 W lResistor:variable,wirewound, .50ohms,10%,3 W ;Resistor:variable,wirewound, 300ohms,lineartaper -hp- StockNo. 24-220K 24-560K

48、27-3 24-33 24-100K 27-4 27-3 24-33K 210-54 24-68K M-80 26-15 31-1500 24-56K 210-2 210-53 Mfr.*&Mfrs. Designation B GB2241 B GB5641 S Type2R B GB3301 B GB1041 S Type2R S Type2R B GB3331 B B GB6831 HP R TypeBW-l GG TypeCP-l B GB5631 G #21-010-067 G #21-010-358 . *SeeListofManufacturersCodeLettersForRe

49、placeablePartsTable. -12- TABLEOFREPLACEABLEPARTS Circuit-hp-Mfr.&Mfrs. Ref.DescriptionStockNo.Designation R57Electricalvalueadjustedatfactory R58,R59Resistor:fixed,composition, 24-100KB 100,000ohms,10%,1 W GB1041 R60Resistor:fixed, composition,24-56-5 B 56ohms,5%,lW GB5605 R61Resistor:fixed, composition,24-100KB 100,000ohms,10%,lW GB1