HP-400AB-Manual-sn-482 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 INSTRUCTIONMANUALCHANGES MODEL400AB VAC,DUMTUBEVOLTMETER C12:changeto-hp-StockNo.18-31

2、;Mfr.,X C26:changeto-hp-StockNo.18-40HP;Mfr.,CC C29:changetocapacitor,fixed,electrolytic,2sections, 1500uf/sect.,15vdcw;-hp-StockNo.18-48HP;Mfr.,CC V1,changetotube,electron,selected,6CB6; V2:-hp-StockNo.G-73W;Mfr.,E V7:changetotube,electron,6CB6; -hp-StockNo.212-6CB6;Mfr.,ZZ Serial1182andabove: NOTE

3、:The1000:1inputvoltagedividerhasbeenchangedfrom acapacitivetoaresistivetype.Referencestoa capacitivevoltagedividershouldbechangedaccordingly: pg.3-1fig.3;pg.3-2para.3-2. Page4-9fig.6:call-outtoC3shouldread:Adjust highfrequencyresponseon3-voltrange. Thetextatthetophalfofpage4-4shouldbechanged toreada

4、sfollows: page4-4 Calibrationconsistsoftwoparts:(1)Adjustingthe amlifiergainonthe1voltrangewithR43(seefig.5). (2)Checkingthefrequencyresponseadjustmentofthe 1000:1divideronthe3voltrange.Thecompensation adjustmentismadewithC3.DONOTDISTURBTHIS ADJUSTMENTUNLESSA HIGHFREQUENCYSTANDARDISAVAILABLE. THISAD

5、JUSTMENTDRASTICALLY AFFECTSTHEFREQUENCY RESPONSEOFTHEINSTRUMENTONTHE3VOLTANDABOVERANGES. HEWLETT-PACKARDco. RadioFans.CN 收音机爱 好者资料库 Model400ABpage-2- Procedureg a.Allowtheinstrumenttoheatfor5minutesbefore calibrating. b.Connectalowdistortiontestoscillatorandanac voltmeteraccuratewithin1/2%at400cpsto

6、the INPUTterminalsoftheModel400AB c.SettheModel400ABrangeswithtothe1voltposition andapplyexactly1voltat400cpstotheINPUT terminals. d.AdjustR43sothattheinstrumentreads1.00volt. Thiscompletesthebasiccalibrationoftheinstrument. Thefollowingstepsshouldbefollowedifsuitableequip- mentisavailablefordetermi

7、nlngfrequencyresponse.An -hp-Model410B,400Dvoltmeterareexcellentforthis purpose. e.SettheModel400ABonthe3voltrangeandapply 3voltsat400cps.Notethereadingonthemonitor meter. f.Changethefrequencyto500kcandadjustthelevel untilthemonitormeterreadsthesameasat400cps. AdjustC3tomaketheModel400ABreadthesamea

8、s at400cps. g.Checktheresponseovertherangeof100kcto600kc. ItmaybedesirabletoadjustC3slightlytosplit anyerrortoobtainthebestover-allaccuracy. Section4-10shouldreadg; Thehighfrequencyresponseoftheamplifierisaffected bythevalueofC25,whichneverneedsadjustment.The lowfrequencyresponseatOcpsisaffectedbyth

9、e valueofR56.Smallervaluesofresistancelower tperesponseat10cps.ThevalueofR56isselected atthefactoyandshouldneverneedadjustment. Poorfrequencyresponseat10cpsisusuallydueto weaktubes.V2andV3havethemostaffect.The amplifierhasapproximately45dbofnegativefeedback whichmakesthefrequencyresponsealmostindepe

10、ndent oftubeagingatmid-frequencies.Weaktubeswill affectthefrequencyresponsesomewhatat600kcand 10cps,wherethefeedbackisless. The1000:1resistiveinputdlviderisadjustedforflat frequencyresponsewlthC3onthe3-voltrange.NO ATTEMPTTOADJUST C3SHOULDBEMADEUNLESS A REFERENCE VOLTMETERISAVAILABLEWHICHHASFLATFREQ

11、UENCY RESPONSEFROM400cpsTO600KC. .- RadioFans.CN 收音机爱 好者资料库 Model400ABpage-3- TheTableofReplaceablePartsshouldbechangedasfollows R3,R4:changetoresistor,matched,R3=10031megohms, R4=10.21K;-hp-StockNo.400D-67;Mfr.,HP R5:deletethiscircuitreference ADDR65:,resistorfixed,composition,100ohms,+10%,1/2W; -h

12、p-StocNo.23-100;Mfr.,B ADDR66:resistor,2.2megohms,10%,Electricalvalueadjusted atfactory;averagevalueshown. Theschematicdiagramshouldbechangedasshowninthefollowing sketch. . MODEL400AB PRODUCATIONCHANGE Serial1182andAbove Inputvoltagedividerchangedfromcapacitivetoresistivetype. adjutfrequ.encyrespons

13、e on 3voltrangeat500 kc Cl.01Jlf C30 110JlJlR6470 2 R33 R710K 10.3lM 4 5 6 7 R4 8 SlaIC51,0 C4 10.2lK 9 Rl .017. R66* 330K2.2M R65 100 - C2 + R2 20Jlf lOOK - *Valueadjustedatfactory. ,. OPERATINGANDSERVICINGMANUAL FOR MODEL400AB VACUUMTUBEVOLTMETER Serial982andAbove Copyright1957byHewlett-PackardCom

14、pany Theinformationcontainedinthisbooklet isintendedfortheoperationandmain- tenanceoCHewlett-Packardequipmentand isnottobeusedotherwiseorreproduced withoutthewrittenconsentoftheHewlett- PackardCompany. HEWLETT-PACKARDCOMPANY 275PAGEMILLROAD,PALOALTO,CALIFORNIA,U.S.A. 400AB004-3 TABLE1.SPECIFICATIONS

15、FORMODEL400AB VOLTAGERANGE:0.3mvto300volts.11ranges,selected withfrontpanelswitch.Fullscaleread- ingsof: FREQUENCYRANGE: 0.003volts 0.01 0.3 10cpsto600KC. O. 1 0.3 l.0 3.0 10.0 30 100 300 ACCURACY: CALIBRATION: INPUTIMPEDANCE: AMPLIFIER: POWER: SIZE: WEIGHT: Withnominallinevoltage10%(103volts to127v

16、olts),overallaccuracyiswithin 2%offullscale,20cpsto100KC,3% 10cpsto600KC. Readsrmsvalueofsinewave.Voltage indicationproportionaltoaveragevalue ofappliedwave.Linearvoltagescales, oto3and0toL0;dbscale,-12dbto +2db,basedon0dbm=1mwin600ohms, 10dbintervalsbetweenranges. 10megohmsshuntedbylessthan25l-L. O

17、utputterminalsareprovidedsovolt- metercanbeusedtoamplifysmallsig- nalsormonitorwaveformsundertest withanoscilloscope.Atleast0.25volts availablefrom600ohmsource.Ampli- fierresponsesameasvoltmeterabove 20cps. 115/230volts,10%,50/1000cps,approx. 75watts. CabinetMount:11-1/2high,7-1/2 wide,8-1/4deep. Ra

18、ckMount:19wide,7high, 8-1/4deep. CabinetMount:Net13Ibs.;shipping weight19lbs. RackMount:Net16lbs.;shipping weight26lbs. TABLEOFCONTENTS MODEL400AB VACUUMTUBEVOLTMETER PageNo. SectionIGENERAL 1-1GeneralDescription.I-I 1-2DamageinTransit1-1 1-3PowerTransformerConversionI-I 1-4AccessoriesAvailable.1-2

19、SectionIIOPERATINGINSTRUCTIONS 2-I 2-2 2-3 2-4 2-5 2-6 ControlsandTerminals Operation,General. VoltageMeasurement DBMeasurement Usingthe400ABasanAmplifier. AverageRespondingMeters 2-1 2-2 2-2 2-4 2-5 2-5 SectionIIITHEORYOFOPERATION 3-1 3-2 3-3 3-4 3-5 General InputVoltageDivider VoltmeterAmplifier.

20、MeterandRectifier. PowerSupply. . . . . . 3-1 3-2 3-2 3-2 3-2 SectionIVMAINTENANCE 4-1 4-2 4-3 4-4 4-5 4-6 4-7 4-8 4-9 4-10 Introductory CaseRemoval ServicingEqipmentRequired. TroubleLocalization. PowerSupply. VoltmeterCalibrationandGain TubeReplacement MeterZeroAdjustment ResidualMeterReading Frequ

21、encyResponse. 4-1 4-1 4-1 4-2 4-3 4-3 4-4 4-5 4-5 4-6 SectionVTABLEOFREPLACEABLEPARTS5-1 SECTIONI GENERAL 1-1GENERALDESCRIPTION TheModel400ABisacompactvacuumtubevoltmeterwhichwill measurevoltagesfrom.003voltsfullscaleto300voltsfullscale overafrequencyrangefrom10cpsto600KC.Theinputimped- anceis10mego

22、hmsshuntedbylessthan25-L-Lf. Thebasicaccuracyofthesemeasurementsis2%offullscalein- dicationonallrangesfrom20cpsto100KCwitha3%accuracy offullscaleindicationsonallrangesovertheentirerangefrom lOcpsto600KC.IthasareadablesensitivitytoO.3millivolts whichissufficienttomeasurehumlevelandnoisedirectly,as we

23、llasperformingavarietyoflaboratoryfunctionsinmeasuring gain,networkresponse,andoutputlevel. Theinstrumentisprovidedwithoutputterminalssothatitmaybe usedasahighgain(40db)broadbandamplifiertoincreasethe sensitivityofexternalequipmentsuchasoscilloscopesorpridges. 1-2DAMAGEINTRANSIT Shouldshippingdamage

24、becomeevidentuponunpackingthisinstru- ment,followtheprocedureoutlinedintheClaimforDamage sectiononthelastpageofthismanual. 1-3POWERTRANSFORMERCONVERSION ShoulditbedesiredtoconverttheModel400ABtooperatefrom a230vsupplyproceedasfollows: a.Removethetwobarewirejumpersontheterminal striplocatedontheright

25、sideoftheinstrumentchassis abovethepowertransformer.Thesejumpersconnect theBLACKtotheBLACK-GREENleadandtheBLACK- REDtotheBLACK-YELLOWleadfromthepowertrans- formerprimary. b.Insertanewjumperontheterminalstripwhichcon- nectstheBLACK-YELLOWtotheBLACK-GREENlead. 1-1 c.ChangethelinefusetoonewithaO.5amper

26、eslow-blow rating.Asshownontheschematicdiagramthisaltera- tionchangestheprimarywindingsofthepowertransformer fromaparalleltoaseriesarrangement. 1-4ACCESSORIESAVAILABLE Model452ACapacitiveVoltageDivider- ExtendstheACvoltagerangeoftheModel400ABto 25,000volts. Maximumvoltage: Frequencyrange: Accuracy:

27、Divisionratio: Inputcapacity: 25,000volts 25cycles/sec.to20MC 3% 1000:1 15IJ.lJ.f1IJ.lJ.f Model454ACapacitiveVoltageDivider- ExtendsthevoltagerangeoftheModel400ABto1500volts. Maximumvoltage: Frequencyrange: Accuracy: Divisionratio: Inputimpedance: 1500volts 20cycles/sec.to4megacycles 3% 100:1 50mego

28、hmsshuntedwith2.751J.IJ.f Model470A-470FShuntResistors- TheseshuntresistorsadapttheModel400ABformeas- uringcurrentsassmallas3lJ.afullscale. Accuracy:1%to100KC,Models480A-F: 5%to1MC,Model470A 5%to4MC,Models470B-F Maximumpowerdissipation:1watt Model 470A 470B 470C 470D 470E 470F ShuntResistance 1ohm 1

29、.0ohm 10.0ohms 100.0ohms 600.0ohms 1000.0ohms 1-2 ModelAG-60ALineMatchingTransformer- AdaptstheModel400ABforthemeasurementofvolt- agesoneithera135ohmor600ohmbalancedline. Frequencyrange: Impedance,primary: Impedance,secondary: Insertionloss: Frequencyresponse: Balance: Powerhandling capacity: 5KGto6

30、00KG 135ohmsor600ohms,balanced. 600ohms,onesidegrounded. Lessthan.2dbat100KG. Lessthan.5dbreductionat 5KGand600KGfrommid-fre- quencyvalue. Betterthan40db,entirefre- quencyrange. +22dbm(10voltsat600ohms). ModelAG-60BBridgingTransformer- Operatesthroughtheaudiorangetomatchorbridge theModel400ABtobalan

31、cedsystemswithoutdisturb- ingthecircuitsundertest. Frequencyrange: Impedance,primary: Terminating Resistance: Insertionloss: Frequencyresponse: Distortion: Balanced: Maximumlevel: 1-3 20cpsto45KG. 600ohms. 600ohmsor10,000ohms. Lessthan1dbat1KG. ldb,20cpsto20KG;2dbto 45KG. LessthanO.1%,50cpsto20KG; L

32、essthanO.5%at20cps. Betterthan60db. +15dbm,(4.5voltsat600ohms). SECTIONII OPERATINGINSTRUCTIONS 2-1CONTROLSANDTERMINALS PowerSwitch(ON) RangeSwitch(DBVOLTS) INPUT OUTPUT FUSE POWERCORD Thistoggleswitchcontrolsthepower suppliedtotheinstrum.entfrom.the powerline.IntheONpositionthe redpilotlam.pwillglo

33、w. Thisrotaryswitchselectsthefull scalevoltageorthezerodbm.deci- belscaletobeused. Thesebindingpostsoftheuniversal typearetheinputterm.inalsforthe instrum.ent.Thelowerterm.inal m.arkedGisconnectedtothechassis. Theterm.inalsarearrangedtoac- cepta3/411spaceddouble-bananaplug. Theseuniversaltypebinding

34、posts aretheoutputterm.inalsfortheam.- pliHersectionofthevoltrr_eter. Thisfuseholder,locatedontherear oftheinstrum.ent,containsa 1am.- perecartridgefusewithaslowblow rating.Whenoperatingtheinstru- m.entconvertedfor230voltline voltage,thefuseshouldhaveaO.5 am.pereslowblowrating. Thethreeconductorpowe

35、rcableis term.inatedinapolarizedthree-prong m.aleconnector.Thisterm.inationis provideduponrecom.m.endationofNE- MAandfortheprotectionofoperating personnel.Insteadofbreakingoffthe groundterm.inal,itisrecom.m.ended thatanadaptorbeusedtom.atethe three-term.inalplugwithatwoterm.i- nalreceptacle.Thiswill

36、(l)provide operatingpersonnelwiththesafety advantagethepolarizedplugoffers, and(2)retaintheconnectorforuse whentheplantisequippedwith groundedfem.alereceptacles. 2-1 2-2OPERATION,GENERAL WhentheModel400ABisreceivedfromthefactory,themeter pointershouldindicatezerobeforetheinstrumentisturnedonas expla

37、inedinparagraph4-8.Aftertheinstrumentisturnedon, themeterpointermayshowanindicationashighasonescale divisionsofthe0-1scale.Thiseffectisnormalanddoesnotim- pairtheaccuracyoftheinstrument. Strayvoltagesinthevicinityoftheinstrumentfrequentlycause erroneouspointerdeflectionwhentheinstrumentisoperatingon

38、 itslowestranges.Theconditionarisesbecauseofthehighinput impedanceoftheinstrumenttogetherwithitsamplifiergain. Whenmakingmeasurementsfromalowimpedancesource,shielded leadswillreducetheinducedpickup. Ifmeasurementsaremadefromahighimpedancesource,stray pickupcanalsoaffectthemeterindication.Shieldedlea

39、dswill reducethepickup,butatthesametimetheshieldingwillincrease thecapacityshuntedacrossthesource,andmaycauseexcessive circuitloadingathighfrequencies.Inthecaseoflowlevelmeas- urementstheuseofanoscilloscopeisrecommendedtomonitor thewaveformsundertest. TheModel400ABisanaveragerespondingdeviceasdiscus

40、sed inparagraph2-6andassuchhascertaininnatepropertieswhich affectmeasurement.AlthoughthemeteriscalibratedRMSVOLTS themarkingsrefertothemeasurementofatruesinewave.Ifthe signalundermeasurementcontainsharmonicallyrelatedsinusoids, measurementerrorswillbeencounteredasdescribedinTable2-1. 2-3VOLTAGEMEASU

41、REMENT Connecttheinstrurnenttoapropersource.Allowaboutfivemin- utesfortheinstrumenttoreachastableoperatingconditionafter itisturnedon. 2-2 / 1 +20 I tl5 CD 0 I tlO Z It 0 . I 1-. - +5 It . 1 (,) W a: a: 0 0 (,) a: w .-5 W -10 -20 -25 I10100100010KlOOK 1MPEDANCE-OHMS Fig.2ImpedanceCorrectionGraph 2-3

42、 a.ConnectthesignalundermeasurementacrossinINPUT terminals. b.Thevoltageundermeasurementequalsthemeterindica- tionmultipliedbytherangeswitchpositiondividedbythe fullscalevalueoftheappropriatemeterscale. EXAMPLES MeterRangeMeterSignal IndicationPositionScaleVolts 1.630316 7 011007 2-4DBMEASUREMENT Me

43、asurementsintermsofdecibelsaremadethesamewayas voltagemeasurementsexceptthatthemeterindicationisreadon thedbscale.Thelevelindbmisthealgebraicsumofthemeter dbindicationandtherangeswitchpositionwhenthemeasurement ismadeacross600ohms.However,leveldifferencesmaybe readdirectlyasdbwhenthelevelsaremeasure

44、dacrossequal impedances. EXAMPLES (Across600.J.) Meter Indication -6 +1 Range Position -10 -20 dbm -16 -19 ,.-ACROSSEQUALLOADS Meter Indication A+2 B-3 Range Position +10 -10 db +12 -13 dbDifference=A - B =12-(-13) =25db 2-4 dbmACROSSLOADSNOTEQUALTO600OHMS Toobtainthelevelindbmwhenmakingmeasurements

45、across impedancesotherthan600ohmstheimpedancecorrectiongraph, showninFigure2,isprovided.Thecorrecteddbmlevelisthe algebraicsumoftheinstrumentreadingandthecorrectionfrom thegraph. EXAMPLE-, 400AB Indication +30 Load 90ohms Graph Correction +8(at90) dbm +38 2-5USINGTHE400ABASANAMPLIFIER TheModel400ABm

46、aybeusedasanamplifiertoincreasethe sensitivityofexternalmeasuringequipment.Themaximumvolt- agegainisapproximately100whentherangeswitchisinthe3 millivoltposition,withatleast0.25voltsfroma600ohmsource appearingacrosstheOUTl-l1Tterminals. HighervoltagesmaybeappliedtotheamplifierINPUTprovided thatthepos

47、itionoftherangeswitchindicatesafullscalevoltage equaltoorgreaterthantheinputvoltage.Theamplifiergainis .o.creasedin10dbstepsastherangeswitchisadvancedtoward thehighendfromthe3millivoltposition.AttheO.3voltposition oftherangeswitchtheamplifierhasagainofunity. 2-6AVERAGERESPONDINGMETERS TheModel400ABi

48、sanaveragerespondingdevicecalibratedto indicatermsvalues.Itshouldberememberedthatthermscali- brationsonthemeterfacearebasedonthemeasurementofa truesinewave,andthatthecalibrationisvalidonlywhenmeas- uringatruesinewave. Metersoftheaveragerespondingtyperespondtothosevoltages whichrepresenttheabsoluteav

49、erageofthevariationsfromthe dcmeanvalue.Sincethermsvalueofasinewaveis1.11times theabsoluteaverage,anaveragerespondingmeterindicates1.11 timestheabsoluteaverageofanycomplexacwavewhenthemeter faceiscalibratedforthermsvalue. 2-5 Ofparticularinterestinnormalmeasurementisthesinewave partiallydistortedbyharmonicallyrelatedsinusoids. Ifthewaveformundermeasurementcontainsappreciableharmonics, errorsofthemagnitudeshowninTable2-1maybeanticipated. ThisdiscussioninnowaycharacterizesalimitationoftheModel 400ABsincet