HP-711A-Manual-SN-002 电路图.pdf
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 I ;I I 71lA I I i .; i I POWERSUPPLY SERIALSPREfiXED:002- I i I I I I I:i J I ! i ! I I , I OPERATINGANDSERVICINGMANUAL t. I RadioFans.CN 收音机爱 好者资料库 ) OPERATINGANDSERVICINGMANUAL MODEL711A POWERSUPPLY SERIALSPREFIXED:002- CopyrightHEWLETT-PACKARDCOMPANY1956 275 PAGEMILLROAD,PALOALTO,CALIFORNIA,U.S. A. 711A004-3/1-60 RadioFans.CN 收音机爱 好者资料库 ) OUTPUTVOLTAGES DCRegulatedHigh Voltage: ACUnregulated: REGULATION RIPPLE METERING CurrentMeter: VoltageMeter: TERMINALS OVERLOADPROTECTION POWER SIZE CabinetMount RackMount WEIGHT CabinetMount: RackMount: SPECIFICATIONS oto500volts(withoutswitching),100 rnamaximumload. 6.3volts,6ampsmaximumload;12.6voltsCT,3ampsmaxi- mumload Forlinevoltage115/230volts10%,lessthan0.5%changeor 1.0voltchang,whicheverisgreater;fromnoloadtofullload, changeoflessthan0.5%or1.0volt(whicheverisgreater). Lessthan1.0 mv oto100 rna;0to10 withpush-button oto+500volts;0to+50voltswithpush-button Eitherpositiveornegativedcregulatedhighvoltageterminalmay begrounded AClinefused.Overloadrelaypreventsdcoutputfromgreatly exceedingcurrentratingofoutputmilliammeterthusprotecting instrumentfromoverloadconditionsincludingshortcircuitoutput. 115/230volts10%,50/1000cps.Approximately145wattsde- pending onloadandlinevoltage. 7-3/8in.wide,11-1/2in. high,14-1/4in.deep. 19 in. wide, 7 in. high,12-7/8in.deepbehindpanel. Net:20lbs.,shipping:26lbs. Net:24lbs.,shipping:35lbs. SECTION I CONTENTS GENERAL DESCRIPTION 1 - 1 1 - 2 1 - 3 1 - 4 GeneralDescription Inspection. PowerCable. 230-VoltOperation 1-1 I - 1 1-2 I - 2 SECTION IIOPERATING INSTRUCTIONS 2 - 1 2 - 2 2 - 3 ControlsandTerminals. OperatingProcedure OutputOptions. . . II -1 11-2 II - 3 SECTIONillCIRCUIT DESCRIPTION 3 - 1 3 - 2 3 - 3 3 - 4 3 - 5 GeneralDescription. . Input. Regulation. . . SettingofOutputVoltageLevel. OverloadRelay. . . . ill-1 ill-2 ill-2 ill-3 ill-5 SECTIONIVMAINTENANCE 4 - 1 4 - 2 4 - 3 4 - 4 4 - 5 4 - 6 4 - 7 4 - 8 4 - 9 4 - 10 General. CoverRemoval TubeReplacement ReplacementofElectrolyticCapacitors. ReplacementofVariableResistors. . ReplacementofRectifiers. . MeterZeroAdjustment. . . . PowerTransformerPrimaryConnections. TroubleShootingChart TroubleLocalization. . . . IV-1 IV -1 IV-1 IV-2 IV -2 IV- 3 IV -3 IV - 3 IV -4 IV - 6 SECTIONVTABLEOFREPLACEABLEPARTS 5 - 1TableofReplaceableParts. . . . . . . .V - 1 Sect.IPage1 SECTIONI GENERALDESCRIPTION ,-CAUTION-, Dangerousvoltagesarepresentattheterminalsand withinthisinstrument ) ) 11GENERAL DESCRIPTION The Model 71lAPowerSupplyisageneral-purpose low-powerd-canda-cvoltage supplyparticularly suitedtopoweringexperimentalsetups. BymeansofthefacilitiesprovidedbytheModel 711Athefollowingvoltagesaremadeavailableat theoutputterminalsonthecontrolpanel: Unregulatedac: 6.3volts,3amperesmaximumloadcurrent (twosupplies)or 6.3volts,6amperesmaximumloadcurrent (one supply)or 12.6volts,3amperesmaximumloadcurrent (onesupply,tappedat6. 3V). Regulateddc: oto 500volts,continuouslyvariable;maxi- mumoutputloadcurrent,100mao NOTE:InsulationwithintheModel 711Apermits operating thed-coutput voltageasmuchas500volts fromchassisgroundsothattwo Model 71lApower suppliesmaybeoperatedinseriestoobtain1000 voltsd-coutput whileeachinstrumentchassisre- mainsatgroundpotential. Thed-coutput of the Model 71lAhashigh stability; forlinevoltagevariationswithinratedlimits,the level of the regulated output willvarylessthanO.5% or1volt(whicheverisgreater),andfromnoload to full load theleveloftheoutput willvarylessthan 0.5%or1volt(whicheverisgreater).Ripple will belessthan0.001volt. While theinternalimpedance oftheModel711Awill varyboth with thed-cloadcurrentand the frequency of any reflections from the equipment being powered, theinternalimpedanceoftheModel711Awillbe lessthan10ohmswith any loadcurrentandatany frequencyupto a fewmegacycles. Thedcoutputiscontinuouslymonitoredby two meters,avoltmeterandamilliammeter.A low and highrangeareprovidedforeachmetersothat lowvaluesof voltage andcurrentmay bereadaccu- rately. Thepowersupplyisprotectedfrominputorout- putoverloadby(1)a fuseintheline-voltageinput circuitand(2)arelay,inthemainpositivebus, whichoperatesatoverloadcurrenttointerruptcon- duction through theregulator. 12INSPECTION Thisinstrumentwasthoroughlytestedand inspected beforebeing shipped, andisreadyforusewhenre- ceived. Aftertheinstrumentisunpacked,itshould bein- spectedcarefullyfordamagereceivedintransit. Ifany shipping damageisfoUId, follow theprocedure outlinedintheClaimforDamageinShipment sheetinthisinstructionmanual. Sect. IPage2 1.3POWERCABLE Thethree-conductorpower cable supplied withthis instrumentisterminatedin apolarizedthree-prong male connector recommendedbythe NationalElec- tricalManufacturers Association.Thethirdcontact isan offset round pin added to astandardtwo-blade connector which grounds the instrumentchassiswhen usedwithanappropriatereceptacle.Tousethis connectorwith astandardtwocontactreceptacle, anadaptershouldbeused to connect theNEMAcon- nector to the two-contactsystem.Whentheadapter isused,thethirdcontactisterminatedin ashort leadfromtheadapterwhichcanthenbe connected totheoutletmountingbox inordertogroundthe instrumentchassis. 14230YOLT OPERATION Thisinstrumentisnormallyshippedfromthe factorywiththedual115voltprimarywindings ofthetransformerconnected inparallelforoper- ationfromanominal115voltsource.Ifoper- ationfromanominal230voltsourceisdesired, thewindingsmayeasilybereconnectedinseries. Refertotheschematicdrawingfordetails. Thepowerfusemustbechangedfroma 1. 6am- pereslow-blowfusetoa0.8ampereslow-blow fuse. ) ) 2.1CONTROLS AND TERMINALS Allcontrolsandterminalsexceptthefuseholder aremounted onthefrontpanel.Thefuseholderis mounted ontherearplateoftheinstrument. Voltmeter- Thissinle-scale,two-range(0to500volts;0to 50volts)voltmeterindicates the voltagelevelatthe output of the main regulator.With theDCVOLTAGE switchatON,thelevelof voltageattheDCVOLT- AGEoutputterminalsisindicated bythevoltmeter. Normallythemeterindicateson the0-to500-volt range; with the50VOLTS FULL SCALE push-button switchdepressed,themeterindicatesonthe0-to 50-voltrange. Milliammeter- This single-scale, two-range(0to100milliamperes; oto10rna)milliammeterindicatesthevalue ofthe d-cl.)adcurrent.Upto100 rnacanflowinthe loadcircuitwithoutoverloadingthemilliammeter. Normallythemeterindicatesonthe0-to100-ma range;withthe10MAFULLSCALEpush-button depressed,themeterindicatesonthe0-to10-ma range. 50VOLTSFULLSCALE- Whenoperated(depressed),thisSPDTpush-button switchopensthehigh-rangeseriesmultiplierre- sistorandinsertsthelow-rangemultiplier. 10MAFULLSCALE- Thispush-buttonswitch,whichisccnnectedfor DPST operation,controlstheproportionofcurrent divertedbytherespectiveshuntsacross(1)the milliammeterand(2)theprotectiverelayinseries withthemilliammeter.Whenthe10MAFULL SCALEswitchisoperated,theprotectiverelay operatesatbetween11and 17 rnatointerruptcon- ductionthroughtheregulatorandtherebytointer- rupttheflow ofcurrentthroughthemilliammeter. Sect. IIPage1 SECTIONII OPERATINGINSTRUCTIONS With the switchatnormal, the protectiverelayoper- atesatbetween 110 and 170 rna. D-CVOLTSADJ. Acijustment oftheregulatedd-cvoltagetothedesired levelisbymeansoftheFINE and COARSEcontrol mounted unQertheD.C.VOLTS ADJ. designation. Thelevelofvoltageobtainedatanygivensetting ofthecontrolsisindicatedbythevoltmeter,and theresultingflow ofcurrentintheloadcircuitis indicatedbythemilliammeter. COARSE- OperationoftheCOARSEcontrol(1)adjuststhe settingof aI-megohmvariableresistor,R11, and (2)operatestwomicroswitches,SIAandSIB. a.VariableresistorR11ispartofthevoltage dividerinthecircuitwhichcontrolsthelevel oftheregulatedd-coutputvoltage. b.Themicroswitchesmake connection tovarious tapsonthepowertransformersecondarywind- ing whichfurnishesvoltageforthe maind-csupply circuit.Atthelow-voltageposition(ccw) of the COARSEcontrol, themaind-csupplycircuitisfed bythelow-voltagesectionofthewinding.Asthe controlisturnedcw,the microswitchesareactuated tocompleteconnectiontothehighervoltagetaps. FINE- Operationof the FINEcontrolvariesthesettingof variableresistorR12.Thisresistoralsoispart ofthevoltagedividerinthecircuitwhichcontrols theleveloftheregulatedd-coutputvoltage. IndicatorLights- Therearetwoindicatorlightsontheccntrolpanel: ACVOLTAGE-Thisredindicatorlightglows toindicatethatpowerisappliedtotheinstrument circuits. Sect.IIPage2 DC VOLTAGE-Theoperatingcircuitofthisin- dicatorlightiscontrolledbytheDC VOLTAGE switch,andthelightglowsredwhentheswitchis atONtoindicatethatvoltageisappliedtotheDC VOLTAGEoutputterminals. ACVOLTAGESwitch- ThisSPSTtoggleswitchisintheprimarycircuit ofthepowertransformer.WiththeACVOLTAGE switchatON,linevoltageisclosedtopowertrans- formerT1. DCVOLTAGESwitch- Thereisno voltage on theDCVOLTAGE outputter- minalsuntiltheDC VOLTAGEswitchisattheON position.Whenoperated,thisDPSTtoggleswitch: (1)connects the positived-cbustotheDCVOLTAGE outputterminalsand(2)closesthecircuittotheDC VOLTAGEindicatorlight. OutputTerminals- BoththeACVOLTAGEandDC VOLTAGEoutput terminalsareofthebinding-posttype,willaccom- modateeitherabananaplugorwire,andareso arrangedthatany banana plug with3/4-inchspacing maybeused. ACVOLTAGE- Therearetwopairsof outputterminalsassociated withthea-cvoltagesupply.Dependingonhowthe terminalconnectionsaremade(seeparagraph2-3 below),theModel71lAmaybearrangedtosupply thefollowinga-cvoltages: 6.3voltsat3amperes(twocircuits),or 6.3voltsat6amperes(onecircuit),or 12.6voltsat3amperes(onecircuit,tapped at6.3V). DCVOLTAGE- Thereisonepairof outputterminalsfortheregu- latedd-cvoltage supply:+and-.Thebinding-post nutsforthe+and-terminalsareinsulated.Neither the+northe-terminalisconnectedtothechassis withintheinstrumentsothatthed-csupplymaybe operatedeitheraboveorbelow groundbyappropriate externalconnediontoground. Onthesamemountingplatewiththe+and-termi- nalsisaterminal(G)whichisccnnectedtothein- strumentchassis.TheGterminaliscmnectedto earthgroundwhenthepower-cableconnectoris pluggedintoagroundedfemaleconnector. FUSE- Thefuseholder,whichismounted ontherearplate oftheinstrument,containsthetime-delaycartridge fusewhichprotectstheinputcircuit.Beforestart- ing toinstalla new fuse,checkthatthepowercable isdisconnectedfromtheline.Replacementfuses mustbeoftheslow-blowtype:1.6-amperefuse for115-voltoperationoraO.8-amperefusefor 230-voltoperation. 2-2OPERATINGPROCEDURE BesuretheModel711Aissoplacedthatnothing canobstructtheventilatinglouversinthesidesof thecabinet.Safeoperatingtemperatureswiththe cabinet depend uponfreeairflow through thelouvers. a.Beforeoperatingtheinstrumentforthefirst time,seeparagraph4-7,MeterZeroAdjustment. b.Check that both theACVOLTAGE andDCVOLT- AGEswitchesareintheoffposition.Afterthe Model71lAhasbeenplugged into apowersourceof specifiedvoltage and frequency,turntheACVOLT- AGEswitchtoON,andallow atwo-minutewarmup period. NOTE:IftheModel 711Aistobeoperatedfroma 23Q:Voltsource,check(1)thatpowertransformer T1isstrappedfor230-voltoperation(strapping optionsareshownontheschematicdiagram),and (2)thatfuseF1isaO.8-ampereSlo-Blofuse.See paragraph4-8. With theDCVOLTAGE switchstillintheoff position, connecttheload.Forconnectionarrangementsfor thevariousoptions,seeparagraph2-3,below. c.CheckthattheCOARSEcontrolisinitsmaxi- mumcounterclockwise(low-voltage)position. TurntheDC VOLTAGEswitchtoON. d.Toobtainthedesiredlevelofd-cvoltage,ad- justtheCOARSE and FINEcontrols.Thevolt- meterindicatesthelevelofthed-cvoltagebeing suppliedtothe+and - outputterminals.Ifthelevel ofthed-csupplyisbelow50volts,thevoltmeter maybeoperatedonthe50-voltrangebydepressing the50VOLTSFULLSCALEpush-buttonduringthe voltageadjustmentprocedure. ) 23OUTPUTOPTIONS A-COptions -(Figure2-1) Thea-csupply maybearrangedforanyoneofthree options: Two6.3-volt,3-amperesupplies(Figure2-1A) One 6.3-volt,6-amperesupply, by connecting the two 6.3-voltsuppliesinparallel(Figure2-1B) One12.6-volt,3-amperesupply, by connectingthe two 6.3-voltsuppliesinseries(Figure2-1C) Sect.ITPage3 D-C Options- Amongthe operating optionsforwhichthed-cvoltage supplyterminations maybearrangedarethe following: oto500volts,positiveornegativewithrespectto chassisground. oto500volts,neithersidegrounded.(Itisrecom- mendedthattheinstrumentchassisbegrounded whenever bothd-cterminalsareoperatedata poten- tialaboveorbelowground.) Upto1000volts,byconnectingtwo Model 711AIS inseries. TO LOAD 6.3V6.3 V 3A3A EJOI tAl TO LOAD 6.3V6.3 V 3A3A (8) TO LOAD STR_AP-+-+-,r, (C) ) ) Figure2-1.Model 71lAConnectionArrangementsforA-CSupply Options Sect.IIIPage1 ) SECTIONIII CIRCUITDESCRIPTION .1GENERALDESCRIPTION The Model711APowerSupplyfurnishesaregulated variabled-cvoltage(HVsupply) and an unregulated a-cvoltage.Regulation of theHVsupplyisobtained bymeansof amainregulator,whichregulatesthe voltage suppliedtotheDCVOLTAGE outputtermi- nals,andaseccndaryregulatorwhichregulates the voltage which supplies thereferencevoltage and mostoftheoperatingpotentialsfortheregulator circuits.Arrangementof themaincomponents of thed-csupplycircuitisindicated in blockdiagram forminFigure3-1,anddetailedcircuitryof the Model 711Aisshown intheschematicdiagram. ence to thereferencevoltage bus (whichisapprox- imately200voltsnegative withrespecttothemain negative bus). Powerfromanexternalsourceisappliedtothe Model 711AthroughpowertransformerT1.Volt- agefortheHVsupplyistakenfroma T1secondary winding whichistappedforvariousoutputvoltages and,bymeans of connections through microswitches operatedbytheCOARSEcontrol,providesanin- putwhichisvariable(paragraph3-4b).Voltage fromthe tapped secondary feeds seleniumrectifiers SR2, SR3,andcapacitorsC2, C3connectedasa voltagedoubler. Onthe schematic, voltages shownforthe mainposi- tive bus, theHVvoltage supply, and the mainseries regulatorarewithreferencetothemainnegative bus; those shownforthe maincontroltube, cathode follower,secondaryregulator(V3Aand V3B), and secondaryregulatorvoltage supplyarewithrefer- Fromthe doubler, the positive busisbrought through the winding of overloadrelayK1para. 3-5), these- riesregulator,V1andV2(para.3-3), theOCVOLT- AGEswitch, and the milliammeter, to theOCVOLT- AGE+outputterminal.Thevoltmeterisconnected acrossthe main positive and negativebusses.With the outputcircuitsoarranged,thereiscontinuous MAINNEnVEBUS num NIILI SRlSR C2.C3 ( NICIIOlTlI SUIILI TI/I50V-265V /,-1111SIIItH!Sf- - - - - - - / / /.-_-=MA:=:.N.:.:POSJ=nVF:.:-:8US=-+-_-. r- REF.w;lt.TAGC/IUS Figure3-1.Model711APowerSupplyBlockDiagram Sect. IIIPage2 indication of thelevelof the voltage between theDC VOLTAGE+and - outputterminalsand ofcurrent flowthrough the load. The Model 71lAcircuitisdis- cussed ingreaterdetail in the followingparagraphs. discussion.Thecathodesofthecontroltubesare maintainedata constant levelbyavoltage-re
