HP-452A-Manual 电路图.pdf
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 INST R U C TIONAND0PERA TINGMANUAL FOR MODEL452A CAPACITIVEVOLTAGE DIVIDER HEWLETT-PACKARDCOMPANY 395PAGEMILLROAD.PALALTO,CALIFORNIA.U.S.A. RadioFans.CN 收音机爱 好者资料库 INSTRUCTIONS MODEL452A CAPACITIVEVOLTAGEDIVIDER INTRODUCTORY The-hp-Model452ACapacitiveVoltageDividerprovidc.5a.voltagedivi- sionof1000-to-landisdesignedtobeusedwiththe-hp-Model400A,400Cor 410A*VTVM.Voltagesashighas25,000voltsrmscanbemeasuredwiththe Divider.WhenusedwiththeModel410A*VTVM,theDividerwillpermitthe measurementofvoltagesovertherangefrom25cpsto20megacycles.When usedwiththeModel400Aor400CVTVM,theDividerWIllpermitthemeasurement ofvoltagesoverarangefrom25cpstotheupperfrequencylimitofthevoltmeter. Anominal15micromicrofaradvacuumcapacitorisusedasthehigh-volt- agecapacitor.Inserieswiththiscapacitorarerelativelylow-voltagecapacitors totalingapproximately15,000mm.Thus,theinputcapacityofthedivideris onlyapproximately15mmf. UNPACKING TheModel452Aispackagedintwopackages.Onepackagecontainsthe metalbaseoftheDividerandthesecondcontainsthevacuumcapacitor.Thesetwo packagesshouldbeunwrappedcarefullyandinspectedforpossibledamageinship- ment.Ifanyshippingdamageisdiscovered,followtheproceduresetoutinthe WarrentyatthebackofthisManual. P4/lpt ThevacuumcapacitorItsintotheholeinthetopofthebase.Theset screwwrenchfortighteningthe#8setscrewthatholdsthecapacitorinplaceis locatedontheinsideoftheplateonthebottomofthebasefortheDivider.The baseplatecanberemovedbyremovingthescrewsthatholdtheplateinplace. IftwoormoreDividersareorderedatonetime,makecertainthatthe propervacuumcapacitorisassembledwithitsproperbase,forthereasonthat thevacuumcapacitorsarenotnecessarilyinterchangeablewithoutreadjusting thecapacityvaluesinthebasesoftheDivider. SAFETY WHENMEASURINGTHEHIGHVOLTAGESOFWHICHTHEDIVIDERIS CAPABLE,SAFETYOFPERSONNELANDEQUIPMENTISIMPORTANT. THESAFETYWARNINGSINTHISMANUALSHOULDBEREADTHOR- OUGHLYANDFOLLOWEDCAREFULLYINORDERTOPRECLUDE THEPOSSIBILITYOFFATALACCIDENTS. *AlsoModel410B -1- RadioFans.CN 收音机爱 好者资料库 . GROUNDING TheDividerisdesignedtobeoperatedwiththecommon(lower)terminal grounded.Whenmeasuringhighvoltages.hecommonerminalshouldbe groundedthroughalargeconductorhavingnegligibleimpedance.Failuretoheed thisprecautioncancausethebaseoftheDividerandtheVTVMitselftobeata highpotentialandcanfurthercausethevoltmetertoarctothepowerhnefeeding thevoltmeter,thusconnectingtheDividertoapowerline. CORONA Anyconductorthatisconnectedtothehighvoltageterminalatthetopof theDividershouldbewrappedsmoothlyaroundtheerminalwithnosharpedges projecting.Thispreautionisintendedasasafeguardagainstcoronadischarge whichcanaffecttheaccuracyofthereadingsbyloadingthevoltageg-enerator andcanreducethebreakdownvoltageoftheDivIder. FREQUENCYRANGE MAXIMUMVOLTAGE AtlowfrequenciestheDividercanbeusedtomeasurevoltagesupto 25,000voltsrms.However,athIgherfrequenciesthemaximumvoltagethatcan beappliedtotheDividerisreduced.owingtothecurrentlimitationofhecapa- citors.ThemaximumvoltagethatcanbeappliedtoheDivideratvariousfre quenciesisgiveninthefollowingtable: 25kilovolts 22kilovolts 20kilovolts 15kilovolts 7kilovolts MaximumVoltage 60cps 100cps 1mcs 10mcs 20mcs Frequency TheDivideritselfcanbeusedtomeasurevoltagesoverafrequencyrange from25cpsto20megacycles.However,theuseablerangeoftheinstrumentis ordinarilydeterminedbythevoltmeterthatisused.The-hp-Model4l0A*Will permittheuseoftheDivideroveritswholeratedrangeThe-hp-Model400A and400Cvoltmeterspermitmeasurementsfrom25cpsto1mcand2mcrespect- ively. SHELDING Whenmakinghighvoltagemeasurements,itisdesirabletomakecertain thatvoltagepick-upwithinthevoltmeerwillnotcauseanerroneousreading. Pick-upistobeexpectedmoreintheModel410AthanintheModels400Aor400C becauseoftheveryhighimpedancelevelsinheModel410A.*-AlsoModelL1.iGB -2- Thepresenceofvoltagepick-upcanbedeterminedbyconnectingthevolt- agetobemeasuredtotheDividerwithoutconnectingthevoltmetertotheDivider. (AllsafetyprecautionsgivenunderOperationllbelowshouldbefollowed).The voltmeterterminalsshouldbeshieldedwithashieldedtypeplug. IfanappreciablereadingisobtainedonthevoltmeterunderthesecondItions, anerrorwIlloccurInanymeasurementsthataremade.Inotrdertoavoidsuch error,itisnecessarytogroundthevoltmeterwIthagoodground.1grounding doesnotcorrectthetrouble,itisdesirabletoIsolate.hevoltmeterasweIaspos- sible.Ifthevoltagegeneratorisahighfrequencygenerator,shorteningthepower cordorplacingrfchokesinthepowercordforthevoltmeterlHm311rWInrducehe pickup. ACCURACY TheDivideriadjustedtobeaccuratewithin1percent.However,atthe higherfrequenciesthevoltmeterusedwilloftenintroduceanerrorbecauseof theloadlllgeffectofthevoltmeterontheDivider. WhenusingtheModel400C,410A,or410B,theDIVIderisaccuratewthin 3percentatfrequenciesdownto25cps.WhenusingtheModel400A,hevoltage fromtheDIviderisapproximately5percentlowat40cpsand10percentlowat 25cps. BREAKDOWNVOLTAGE ThegapbetweenthehIghvoltageterminalandthebreakdownterminal hasbeenadjustedsothatanarcwillo,ccuratapproximately25kilovoltsrms. OPERATION CAUTION:Neverworkdirectlyonhighvoltageequipmentunlessboth conductorsareshortedtogetherasdescribedbelow. 1.ConnectDividertovoltmeterbymeansofshieldedplugandcord attachedtoDivider.Makecertainthatgroundterminalofshieldedplugis connectedtoground(lower)terminalofvoltmeter.IftheModel410AVTVM isused,theprobeshouldbeplacedontheholderonthebackofthecompartment doorofthe410A.TheDiVIdershotlldbethenconnectedto thterminalsonhe frontofthecompartmetdoor.Connecttheprobeandgroundcliptotheshielded plugterminalsontheDividerwhenusingtheModel410B. 2.Settherangeswitchonvoltmetertohighrange. 3.Solidlygroundthebindingpostprojectingfromthelowerpartofthe Divider. 4.Connectgroundorneutralsideofvoltagetobemeasuredtobinding postprojectingfromthelowerpartoftheDiider. -3- 5.MAKECERTAINTHAT1Tf)LTAGEGENERATORISOFFANDTHAT ANYCAPACITORSAREDISCHA 6.Connectashortingstrapfromgroundtohighvoltageconducor.Iis recommendedthattheshortingstrapbepermanentlyconneced0groundandtha thestrapbeofthetypeinwhichanlnsulaoraleast2feelongisused0move thehotsideofthestrap. 7.Connecthighvoltageconductortobemeasuredtoerrninalontopof Divider. 8.Removeshortingstrapfromhighvoltageconductor. 9.Applyvoltagetobemeasured. 10.ResetvoltmeterrangesWltchifnecessarytoobtainreadablemeter deflection.BEVERYCAREFULNOTTOTOUCHACCIDENTLYTHEDIVIDER. II.Multiplyreadingobtainedonvoltmeterby1000toobtainvoltage appliedtoDivider. 12.Aftermeasurementhasbeenmade,turnoffvoltagegenerator. 13.Waitseveralminutessohatanycapacitors(includingDivider)incir- cuitcanbleedoff. 14.USEGROUNDINGSTRAPTODISCHARGEDIVIDER.CONNECTSTRAP TOHIGHVOLTAGETERMINALORCONDUCTOR.EXERCISEASMUCHCAUTION WHENDISCONNECTINGDIVIDERASWHENCONNECTING. IS.RemovehighvoltageconductorfromhighvoltageterminalofDivider. REPAIRANDCALIBRATION ShoddanyofthecapacitorsinheDividerfall,thereplacemencapacitor mustbeselectedtogivethepropervoltagedivisionratio.Thiscanbedonemost easilybyapplyinga3D-voltrmsvoltageofapproximately1000cpsinfrequency totheDivider.Thecapacitorsshouldthenbeselecedsothata1000:1division isobtainedasreadonavoltmetersuchasthe-hp-Model400Aor400C. -4- 1-15-51DWG.25M-S-IOISERIALITO 1-15-51 G LEeTED VOLTAGE VOLTAGE C4-THISCAPACITORS MIHAL CI TOGIVE1000TO : DIVISION 15UUF ,-, 1.- i _C2C3_C4 PI c) ;oro-6500ll.UF650011UF.- <) UNO L.I MINAL . GRO TER HIGH TER SCHEMATICDIAGRAMOFMODEL452A CLAIMFORDAMAGE IN SHIPMENT Theinstrumentshould betestedassoonasitis received.Ifitfailsto operateproperly,oris damagedinanyway, a claim should be filedwiththe carrier.A fullreportofthedamageshould be obtainedbytheclaimagent, andthisreportshould beforwardedtous. We willthenadvise youofthe dispositiontobe madeoftheequipmentandarrangeforrepairorreplace- ment. Includemodel number,typenumberandserialnumberwhenreferring tothisinstrumentforanyreason. WARRANTY Hewlett-Packard Companywarrantseachinstrumentmanu- facturedbythemto befreefromdefectsinmaterialandwork- manship.Ourliabilityunderthiswarrantyis limitedtoservicing oradjustinganyinstrumentreturnedtothefactoryforthat purposeandtoreplaceanydefectivepartsthereof(except tubes, fusesandbatteries).Thiswan-antyis effectiveforoneyearafter delivery totheoriginalpurchaserwhentheinstrumentis re- turned,transportationchargesprepaidbytheoriginalpur- chaser,andwhich uponourexamination is disclosedtooursatis- factiontobe defective.Ifthefaulthasbeen causedbymisuseor abnormal conditionsofoperation,repairswill be billedatcost. Inthiscase,anestimatewill besubmittedbeforetheworkis started. Ifanyfaultdevelops,thefollowingstepsshould betaken: 1.Notifyus, giving full detailsofthedifficulty,andinclude themodel number,typenumberandserial number. On receiptof thisinformation, we will give you service instructionsorship- pingdata. 2. On receiptofshipping instructions,forwardtheinstru- mentprepaid,andrepairswill be madeatthefactory.Ifre- quested,anestimateofthechargeswill be made beforethework begins providedtheinstrumentisnotcoveredbythewarranty. SHIPPING AllshipmentsofHewlett-Packardinstrumentsshould be made via Railway Express.Theinstrumentsshould be packed in a wooden boxandsurroundedbytwotothreeinchesofexcel- siororsimilarshock-absorbing material. DONOT HESITATE TOCALLONUS HEWLETT.PACKARDCOMPANY Latoratory C2!J,.otrumen,lorcJj.eedand.5:duuracy 395PAGEMILL1l0ADPALOALTO.CALIF. /, LISTOFMANUFACTURERSCODELETTERS FORREPLACEABLEPARTSTABLE CodeLetter A B C D E F G H I J K L M N o P HP Q R S T U V W X Y Z AA BB CC DD EE FF GG HH II JJ ZZ Manufacturer AerovoxCorp. Allen-BradleyCo. AmperiteCo. Arrow,HartandHegeman BussmanManufacturingCo. CarborundumCo. Centralab CinchManufacturingCo. ClarostatManufacturingCo. CornellDubilierElectricCo. ElectricalReactanceCo. ErieResistorCorp. FederalTelephoneandRadioCorp. GeneralElectricCo. GeneralElectricSupplyCorp. Girard-Hopkins Hewlett-Packard IndustrialProductsCo. InternationalResistanceCo. Lectrohm,Inc. Littelfuse,Inc. MaguireIndustries,Inc. MicamoldRadioCorp. OakMfg.Co. P.R.MalloryCo.,Inc. RadioCorp.ofAmerica SangamoElectricCo. SarkesTarzian SignalIndicatorCo. SpragueElectricCo. StackpoleCarbonCo. SylvaniaElectricProducts,Inc. WesternElectricCo. WilkoIProducts,Inc. Amphenol DialLightCo.ofAmerica LeecraftManufacturingCo. AnytubehavingRMAstandardcharacteristics
