HP-712B-Manual-SNprefix-511 电路图.pdf

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1、HP Archive This vintage Hewlett Packard document was preserved and distributed by Pleasevisituson the web! Scanned by on-line curator: Tony Gerbic * For FREE Distribution Only * RadioFans.CN 收音机爱 好者资料库 OPERATING AND SERVICING MANUAL MODEL 7121 POWERSUPPLY Serial511and Above HEWLETT-PACKARDCOMPANY 27

2、5PageMillRoadPaloAlto,California,U.S.A. RadioFans.CN 收音机爱 好者资料库 OPERATINGANDSERVICINGMANUAL FOR MODEL7128 POWERSUPPLY Serial511andAbove Copyright1954byHewlett-PackardCompany Theinformationcontainedinthisbooklet isintendedfortheoperationandmain- tenanceofHewlett-Packardequipmentand isnottobeusedother

3、wiseorreproduced withoutthewrittenconsentoftheHewlett- PackardCompany. HEWLEnPACKARD COMPANY 275PAGE MILL ROAD, PALO ALTO, CALIFORNIA, U.S.A. 7121004.1 RadioFans.CN 收音机爱 好者资料库 TABLEOF CONTENTS FOR MODEL 712B POWERSUPPLY Para.PagePara.Page SECTIONISECTIONIV GENERALDESCRIPTIONMAINTENANCE 1-1General. 1

4、-14-1CoverandBottomPlate 1-2Inspection.1-1Removal4-1 4-2Replacements . .4-1 4-3Adjustments 4-3 SECTIONII4-4LineRegulation Adjustment4-3 2-1ControlsandTerminals.2-14-5AdjustmentofFixed-300 2-2Operation 2-2VoltBiasSupplyOutput Voltage 4-5 4-6AdjustmentOfHVSupply SECTIONIIIOutputVoltage 4-5 4-7SettingV

5、ariableResistor 3-1General. . 3-1R39. 4-5 3-2HighVoltageRegulator4-8SettingtheStopontheH V Circuit. . . . .3-1Control .4-7 3-3BiasSupplyCircuit. 3-3 SECTIONV TABLEOFREPLACEABLEPARTS TABLEOFSPECIFICATIONS OUTPUTVOLTAGES I, DCREGULATEDHIGHVOLTAGE: DCREGULATEDFIXEDBIAS: DCVARIABLEBIAS: ACUNREGULATED: o

6、to+500volts(withoutswitching),200mamaximumload. -300volts,50mamaximumload. oto-150volts,5mamaximumload. 6.3voltsCT,10ampsmaximumload. OUTPUTVOLTAGEREGULATION(forconstantlinevoltage) DCREGULATEDHIGHVOLTAGE: DCREGULATEDFIXEDBIAS: DCVARIABLEBIAS: LINEVOLTAGEREGULATION RIPPLE INTERNALIMPEDANCE DCREGULAT

7、EDHIGHVOLTAGE: RECOVERYTIME METERING CURRENTMETER: VOLTMETER: TERMINALS OVERLOADPROTECTION POWERSUPPLY DIMENSIONS WEIGHT Lessthan50millivoltschangeno-loadtofull-loadatanyoutput voltage. Lessthan50millivoltschangeno-loadtofull-load. Istiedtofixedbias,hencesourceregulationissameasforfixed bias.Interna

8、limpedance0to10,000ohms,dependingonbias controlsetting. RegulatedDCoutputvoltagesvarylessthanl00millivoltsfor linevoltagevariations115volts1O%. Lessthan500microvolts. (Forfrequenciesabove20cps.)Full-load:0.1ohminseries with25microhenriesmaximum.No-load:1ohminserieswith 50microhenriesmaximum. Uponapp

9、licationoffull-load:0.1millisecondmaximum.Upon decreasefromfull-loadto: (a)0ma,0.5millisecondmaximum. (b)25ma,O.1millisecondmaximum. Maximumtransientvoltage,1volt. oto200ma.(highvoltageonly.) Threeranges,0to+500volts,0to+150voltsand0to-150volts. PanelswitchconnectsmetertoDCregulatedhighvoltageorDC v

10、ariablebiasandselectsrange. EitherpositiveornegativeDCregulatedhighvoltageterminalmay begrounded.Positiveterminalsofbothbiassuppliesandnega- tiveterminalsofDCregulatedhighvoltagearecommon. ACline,DCregulatedhighvoltage,DCregulatedfixedbiasand filamentsupplyareseparatelyfused.DCregulatedhighvoltage d

11、ropstoasafevalueifbiasfuseblows. 115volts10%,50to60cps.Approximately120to450watts dependingonloadandlinevoltage. CabinetMount:12-1/2high,20-1/2wide,l4-l/4_deep. RackMount:Panel10-1/2high,19wide,14-1/4deep. CabinetMount:6!1lbs.shippingweightapprox.104lbs. RackMount:62lbs.shippingweightapprox.98lbs. S

12、ECTION I GENERAL DESCRIPTION CAUTION Voltageswhicharedangeroustolife arepresentattheterminalsand withinthisinstrument. 1-1GENERAL TheModel7l2BPowerSupplyisaverystable sourceofcontinuouslyvariabledirectcur- rentforplateandbiascircuits.Italsopro- videsupto10amperes,6.3voltsalternat- ingcurrentforfilam

13、entcircuitsAtwo- rangevoltmeterandamilliammeter(high voltageonly)areprovidedtomeasurethe directcurrentoutput.Thispowersupplyis veryusefulasapowersourceforsmalltrans- mitters,oscillators,complexsystems,cer- taintypesofklystrons,andgenerallabora- toryuse. CAUTION TheACpowershouldbeturnedon foratleast3

14、0secondsbeforeswitch- ingonthehighvoltage.Thisallows theregulatorcircuitstoreachtheir properoperatingpointandavoids excessivevoltageatthehighvoltage terminals. 1-2 INSPECTION Thisinstrumentwasthoroughlytestedand inspectedbeforebeingshippedandisready forusewhenreceived. Aftertheinstrumentisunpacked,i

15、tshould beinspectedfordamagereceivedintransit. Ifanyshippingdamageisfound,followthe procedureoutlinedintheClaimforDamage inShipmentpageatthebackofthisinstruc- tionmanual. 1-1 SECTION II OPERATING INSTRUCTIONS 2-1CONTROLS AND TERMINALS ACPOWER Thistoggleswitchcontrolsthepowersup- pliedtotheinstrument

16、fromthepowerline. WhentheswitchisintheONpositionthe redindicatorlampabovetheswitchwill glow. LINE4AMP Thefuseholder,locatedonthecontrolpanel, containsa 4amperecartridgefuseforthe protectionofthewholeinstrument.The fusemaybereplacedbyturningthefuse- holdercap,removingtheoldfuse,andin- sertinganewfuse

17、.Replacementfusesfor thisinstrumentmustbeoftheSlo-Blo typeasspecifiedintheReplaceableParts List. -300V1/16AMP Thefuseholder,locatedonthecontrolpanel, containsa1/16amperecartridgefusefor theprotectionofthe-300voltfixedbias supply.Thefusemaybereplacedbyturn- ingthefuseholdercap,removingtheold fuse,and

18、insertinganewfuse. NOTE Ifthisfuseblows,thepositive high-voltageregulatorcircuit willdroptheHVvoltagelevelto lessthan100volts,thusprotect- ingexternalequipmentorcir- cuitsagainstthepossibilityof damageduetolossofbias.When theopenfuseisreplaced,allcir- cuitsrestoretonormal. +HV1/2AMP Thefuseholder,lo

19、catedonthecontrolpanel, containsa.5amperecartridgefuseforthe protectionofthehighvoltagedecircuit. Thefusemaybereplacedbyturningthe fuseholdercap,removingtheoldfuse,and insertinganewfuse. 2-1 CAUTION Ifthisfuseblows,immediately turnofftheACPOWERswitch, andthenreplacethefuse.Con- tinuedoperationofthei

20、nstrument withthe+HV1/2AMPfuseopen willdamagethescreengridsof theseriesregulatortubes(V3, V4,V5,V6). HIGHVOLTAGE Thistoggleswitchturnsthehighvoltage directcurrentoffandon.Theswitchalso controlstheredindicatorlightaboveiton thecontrolpanel.Whentheswitchison, theindicatorlampglowsasawarningthat thehig

21、hvoltageisturnedon. 6.3VAC,10AMP Thetwofuseholders,locatedonthecontrol panel,eachcontaina 15amperecartridge fuseforprotectionofthe6.3voltACfila- mentsupplycircuit.Eachfusemaybere- placedbyturningitsfuseholdercap,re- movingtheoldfuse,andinsertinganew fuse.Replacementfusesmustbeofthe Slo-Blotypeasspec

22、ifiedintheReplace- ablePartsList. 6.3VAC10AMPCT Thesebindingpostsareterminalsforthe unregulatedACfilamentsupply. 6.3VAC10AMP Thesearetheterminalsforthe6.3volt unregulatedalternatingcurrent. CT Thisbindingpostistheterminalforthe centertapofthesecondarywindingfrom whichtheunregulatedACistaken. -300V50

23、MA5 !vIAGND Thesebindingpostsareterminalsforthe biassupplyoutputandchassisground. -300V50MA Outputterminalforthefixed-300Vregu- latedvoltagesupply. 5MA Outputterminalforthevariable(0-150 volt)regulatedbiasvoltagesupply. GND Terminalformakingconnectiontothe chassis.Anyoneoftheoutputterminals maybecon

24、nectedtothechassisbycon- nectiontoterminalGND. COM+HVGND Thesebindingpostsareterminalsforthe highvoltagesupply,commonconductor, andchassisground. +HV Outputterminalfortheregulated0-500 voltvoltagesupply. COM OutputterminalcommontotheHV,5MA (variablebias),and-300V50MA(fixed bias)circuits GND Terminal

25、formakingconnectiontothe chassis. -BIASCONTROL Thiscontrolvariestheoutputoftheregu- latedbiasvoltagesupplyfrom0to150volts. HVCONTROL Thiscontrolvariestheoutputoftheregu- latedhighvoltagesupplyfrom0to500volts. METERRANGE Thisswitchconnectstheregulatedhigh voltagesupplycircuittothevoltmeteron eitherth

26、e0-150Vor0-500Vrange.Opera- tionoftheswitchto0-150-BIASconnects thevariablebiassupplycircuittothevolt- meter. 2-2 OPERATION CAUTION Avoidelectricshockbyturningthe highvoltageswitchtotheoffposi- tionbeforemakinganyconnections totheinstrument. 2-2 TheprocedureforoperatingtheModel712B PowerSupplyisasfo

27、llows: a.ConnectthepowercabletoaIlSVpower lineandturntheACPOWERswitchto ON. NOTE Thetriple-conductorpowercableis suppliedwiththenewNEMAapprov- edthree-prongplug.Thethirdcon- ductorprovidesachassisground. Anadaptermaybeobtainedtoper- mituseofthisplugwithtwo-conduc- torreceptacles. b.WiththeHIGHVOLTAG

28、Eswitchinthe offposition,connecttheoutputterminals totheload. c.Ifthebiassupplyistobeused,setthe METERRANGEswitchtothe0-150V -BIASpositionandadjustthe-BIASCONTROL forthedesiredvoltage. NOTE Theinternalimpedanceofthevari- ablebiascircuitcanbeashighas 10,000ohms,dependingontheset- tingof-BIASCONTROL.

29、d.SettheMETERRANGEswitchatthe0- 150Vor500Vposition,andadjustthe HVCONTROLforthedesiredoutputvoltage. e.TurntheHIGHVOLTAGEswitchtoON, checkthebiasvoltage,andreadjust-BIAS CONTROLifnecessary. f.IftheModel712Bistobeusedforan applicationwhichrequiresapowersup- plyofmorethan500volts,upto300volts addition

30、almaybemadeavailablebyconnect- ingtheloadacross+HVand-300V50MA. Groundmaybeconnectedtoeitherterminal, asdesired. SECTION III CIRCUIT DESCRIPTION 3-1GENERAL TheModel7l2BPowerSupplyfurnishestwo separateregulatedsupplies:apositivehigh voltageinthe0-500voltrangeandabias voltage.AblockdiagramoftheModel7l

31、2B isshowninFigure1 Voltagelevelofthehighvoltagesupplyisad- justedbymeansofapanelknob,HVCON- TROL,whichcontrolsthesettingofvariable autotransformerTl.Theautotransformer suppliesprimaryvoltagetothehighvoltage powertransformer,T2.Thecomparis.on voltageintheregulatorcircuitisadjustedby meansofvariabler

32、esistorR39whichisme- chanicallycoupledtotheautotransformer shaft.Thisarrangementmaintainstheregu- latorcircuitatitsoptimumoperatingpoint, regardlessofoutputvoltagelevel. Afterthehighvoltagehasbeenrectified(dual diodesVIandV2)andfiltered,itisapplied toagroupofseriesregulatortubes(pentodes V3-V6),toth

33、eDCmilliammeter,andthen tothehighvoltageoutputterminal,+HV.The conductionoftheseriesregulatortubesis controlledbyacascadedifferentialamplifier (dualtriodesV12andV13).Thedifferential amplifiercomparesasampleoftheoutput voltagewiththevoltagedevelopedacross voltagereferencetubeVII;anydifference between

34、thesevoltagesisamplifiedandthe conductivityoftheseriesregulatortubesis changedaccordingly. Thefixedbiasvoltage(-300V)supplycon- sistsofaconventionalpowertransformer, full-waverectifier(dualdiodeV7),andcapa- citor-inputfilter.Thevoltageisregulated bymeansofaseriesregulatortube(pentode VB),whichiscont

35、rolledinturnbyacascade differentialamplifier(dualtriodesV9and VlO).Operationoftheregulatorcircuitis similartothe+HVregulatordescribedabove. Asourceofvariablebiasvoltageisprovided bymeansofavoltagedivider(variablere- sistorR46)whichisconnectedbetweenthe -300V50MAterminalandtheCOMterminal. Thisvoltage

36、isregulatedagainstlinevoltage variationsonly.Sincetheinternalimpedance maybeashighas10,000ohms,depending uponthesettingofresistorR46,thevoltage willdependupontheactualloadcurrentbe- ingdrawn(5rna.max.).Thisvoltagecan bemeasuredbyturningtheMETERRANGE switchtothe-150V-BIASposition. 3-2HIGHVOLTAGE REGU

37、LATOR CIRCUIT Theregulatorcircuitissoarrangedthata slightvoltagechangeinthesampledoutput inthepositivedirectionwillresultinarela- tivelylargevoltageswinginthenegativedi- rectiononthegridsoftheseriesregulator tubes,andviceversa. Figure2showsthearrangementofdualtri- odesV13andV12which,connectedincasca

38、de, formatwostagedifferentialamplifier.In eachtube,cathodeconnectionsarecommon forthetwosections.Thusanyvariationin platecurrentinonesectionappearsacross thecathoderesistorcommontobothsections, andresultsinadifferencevoltageineachof theoutputcircuits. Inthefirststage,afixedbiassuppliedby voltagerefe

39、rencetubeVIIisappliedtoone gridofdualtriodeV13.Thebiasontheother gridofV13isaportionofthe+HVvoltage, sampledwithrespecttothe-300voltbiassup-. plythroughavoltagedivider.Anyvariation intheleveloftheoutputvoltageresultsin voltagechangesintheplatecircuitsofboth sectionsofV13,andcorrespondingchanges inth

40、ebiasesonthegridsofdualtriodeVIZin thenextstage. Forexample,ifthevoltageofthesampled outputswingsinthepositivedirection,in- creasedcurrentwillflowthroughtheright- handsectionofV13,whichwillraisethecath- odevoltageandlowertheright-handplate (pin1)voltage.Sincethebiasonthegridin theleft-handsectionofV

41、13remainsfixed, theincreasedcathodevoltagewilldecrease conductionintheleft-handhalfofthetube, whichresultinanincreaseinvoltageonthe left-handplate(pin6). 3-1 / OUTPUTI-_-o_+HV CURRENT HIGH VOLTAGE SUPPLY HV CONTROL - I SERIES! 1. REGULATORI -+. r-. orreadslessthan150volts,troubleis inbiassupplycircu

42、it.Checkbiassup- plyDCvoltagesagainstthoseindicated onschematicdiagram(shouldagree within10%). 4-8 REMEDIES 1.Locateandclear shortcircuit. 2.Locateandclear shortcircuit. 3.Replacedefective transformer. 1.Locateandreplace defectivecapacitor. 2.Locateandreplace defectivetube. 3.Locateandclear shortcir

43、cuit. Locatedefectivecom- ponent,andreplace. SYMPTOMSPOSSIBLECAUSETESTPROCEDURE Ifvoltmeterreads-150voltsormore, troubleprobablyisinBVsupplycir- cuit.SetMETERRANGEswitchat 0-500VandturnHVCONTROLto maximumclockwiseposition.Ifvolt- meterdoesnotdeflect,troubleisin HVsupplycircuit,andDCvoltages shouldbe

44、checkedagainstthoseshown ontheschematic.Ifvoltmeterreads lessthan500volts,troublemaybein eitherregulatorcircuit. REMEDIES Locatedefectivecom- ponent,andreplace. Instrumentoper-Defectivefuse,or ating,butoutputdefectivetube(or voltagedeviatesassociatedcomponent) fromdesiredinregulatorcircuit, level:as

45、.detailedbelow: HighVoltage fu!E.E1y VoltageslightlyFuseF2(+HV)blown negative VoltagelowFuseF5(-300V) blown VIO V9 Vl3 VoltagehighVII V12 V7 V8 -300VBias Supply Voltageslightly positiveV8 V7 VoltagelowVII VoltagehighV9 VIO Checkforopenfuse. 1.Checkforopenfuse. 2.Checkforburned-outtube. 3.Ifalltubesa

46、reoperating,check defectivetubeinsuspectedcircuit bysubstitutingtubeknowntobe good. 4.Testexternalcomponentsinsus- pectedtubecircuit. 1.Checkforburned-outtube. 2.Ifalltubesareoperating,check fordefectivetubeinsuspected circuitbysubstitutingtubeknown tobegood. 3.Testexternalcomponentsinsus- pectedtub

47、ecircuit. 4-9 Replaceblownfuse. 1.Replaceblownfuse. 2.Replaceburned-out tube. 3.Replaceanydefec- tivetube. 4.Replaceanydefec- tivecomponent. 1 Replaceburned-out tube. 2.Replaceanydefec- tivetube. 3.Replaceanydefec- tivecomponent. CD oIHIGHLTAGEI l-ri2B-E-,ot-, If0-0 R3852A0 1000 IDCMILLAMPERESI NOTE

48、S CONDITIONSOFDCVOLTAGEMEASUREMENT LLINEVOLTAGEAT115VOLTS.50/1000, 2.NOEXTERNALLOAD 3.COM.CONNECTEDTOGND. 4.HIGHVOLTAGEON 5.HVCONTROLSETFOR+500DCVOLTS 6.VOLTAGESMEASUREDBETWEENINDICATEDPOINTSANDCHASSISWITH VOLTMETERHAVING122MEGOHMINPUTRESISTANCE CONOlTIONSOFACVOLTAGEMEASUREMENT I.THRUSAMEASDCCONDITI

49、ONS 6.VOLTAGESMEASUREDBETWEENINOICATEDPOINTSWITHA1000 OHMIVOLTORBETTERACVOLTMETER ALLCAPACITANCEINwF.RESISTANCE INOHMSUNLESSOTHERWISENOTED OI?lPASCONT:LIIMMi-:1SCR:-:EWQR=IVE=R-:ADJ.ICHASSIS 7r28 R36 390K +$00 +68$ +60 R6 1500 OFMODEL ABOVE COPYRIGHT1954BYHEWLETT-PACKARD ThisdrawlnQIIIntendedforheop.rotionand malnttlloneeatHewlett-Packardequipmentandsnot tobeusedotherwiseorreproduttdwithoutwritten consentoftheHewlett-PackardCompony SCHEMATICDIAGRAM SERIAL511a +1000 RI 25K CI 15F L I 5H VI 5R4GY V2 5R4GY T2 SECTIONV