HP-475B-Manual-sn-11 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 OPERATINGANDSERVICINGMANUAL FOR MODEL475B TUNABLEBOLOMETERMOUNT Serial11andAbove Copyright1956byHewlett-PackardCompany Theinformationcontainedinthisbooklet isintendedfortheoperationandmain tenanceoCHewlett-Packardequipmentand isnottobeusedotherwiseorreproduced withoutthewrittenconsentoftheHewlett- PackardCompany. HEWLETT-PACKARDCOMPANY 275PAGEMILLROAD,PALOALTO,CALIFORNIA,U.S.A. 475BOOl-1 RadioFans.CN 收音机爱 好者资料库 SPECIFICATIONS FREQUENCYRANGE: POWERRANGE: FITTINGS: POWERSENSITIVEELEMENT: OVERALLDIMENSIONS: WEIGHT: Approximately1000-4000MC(varies withSWRandphaseofsourceandvalue ofbolometerload.) 0.1to10milliwatts(with-hp-Model 430CMicrowavePowerMeter.) InputConnector-TypeNfemale (UG23/U). OutputConnector(bolometerdcconnec- tion)-TypeBNC(UG89/U). TypeNMaleConnector(UG21/U)sup- pliedtoreplacebolometerconnector sothatmountmaybeusedasaconven- tionaldouble-stubtransformer. Selected1/100ampereinstrumentfuse. Sperry821orNardaN821Barretter. WesternElectricTypeD166382Ther- mistor. 1811longx7-3/8widex3-5/811deep. 8pounds. . . Pl :l P. Pl 0- o +- -J lJ1 lJj o o . I . RadioFans.CN 收音机爱 好者资料库 . I . o o t:Q U) r- . . OPERATINGINSTRUCTIONS INSPECTION Thisinstrumenthasbeenthoroughlytestedandinspectedbefore beingshippedandisreadyforusewhenreceived. Aftertheinstrumentisunpacked,itshouldbecarefullyinspected foranydamagereceivedintransit.Ifanyshippingdamageis found,followtheprocedureoutlinedintheClaimforDamagein Shipmentpageatthebackofthisinstructionbook OPERATION PowerMeasurements ConnectasignalgeneratororothersourceofpowertotheType Ninputconnectorontheendoftheinstrument.Mountafuse, barretterorotherbolometerelementintheoutputconnectoras- sembly(seeparagraphonBolometerReplacement)andconnect aHewlett-PackardModel430CPowerMetertotheTypeBNCout- putconnector.Asubstitution bridgeorothermeansofmeasuring powermaybesubstitutedfortheModel430C.Tunethetwostubs untilamaximumreadingisobtainedonthepowermeter.Care mustbetakentogetatruemaximumasatsomefrequenciesitis possibletogetafalsemaximumbytuningeachstubindividually. Toinsuregettingatruematch,eitherstubmaybetunedslightly inonedirectionandthenintheotherwhiletheotherstubisrocked backandforth.Thiswillyieldthetruemaximum.Dialsarepro- videdonthetuningknobssothatinproductiontesting,theapproxi- matestubpositionsforeachfrequencymaybenoted.Thisallows rapidtuningandinsuresusingthebestcombinationofstubsuscep- tancesatallfrequencies. Atthehigherfrequencies,itisusuallypossibletoobtainthesame combinationofsusceptancesatdifferentdialreadings.Thisoc- cursbecausethestubsaremorethanone-halfwavelengthlong andthesusceptanceobtainableatonesettingisalsoobtainableat allpointswhichareamultipleofahalf-wavelengthawayfrom thatsetting.Occasionallyaslightdifferenceinthepowerread- ingsatthesedifferentdialsettingsmaybenoted.Forhighestac- curacy,thelowestdialsettingattainableshouldbeused. Atfrequencieswheretheavailablestubtravelisnolimitation,it isalwayspossibletomatchagivenloadtothelinewithtwocom- binationsofstubsusceptances.Atsornefrequenciesthesuscep- tancesrequiredbyonecombinationcanbecomegreatenoughthat -1- stublosseswillcausethepowerreadingtobelessthanforthe othercombination.Thiseffectshowsupatthelowendofthe 475Brangeandrarelyamountstomorethanadb.Careshould betakentofindthepropercombinationforgreatestaccuracy. OperationasaDouble-StubTransformer WhentheModel475Bistobeusedasadoublestubtuner,itis necessarytoremovethebolometerandTypeBNCoutputconnec- torandsubstituteaTypeNconnector.Changingtheseassemblies isdoneasfollows: 1.Unfastenthetwothumbscrewsandremovetheoutput connectorassembly. 2.Pulloutthesplit-diskbolometersocketandinstrument fuse.Thecapacitor,whichisalaminateddisk,will comeoutwiththeinstrumentfuse. 3.Unscrewthesplit-cupbolometersocketandremove fromtheholeinthecenterconductor. 4.RemovethefourPhillipsheadscrewsalongthebottom edgeofthecabinetandliftoutthebottomplate.Remove thecenterconductorDandthemaleinputconnectoras- semblyfromthebottomplate. 5.ScrewthecenterconductorDintotheholefromwhich thebolometersocketAwasremoved. 6.Slipthemaleconnectorassemblyoverthecentercon- ductorandfasteninplacewiththetwothumbscrews. Thiscompletesthechangetoadoublestubtuner. 7.Whenreturningtheinstrumenttoitsoriginalcondition, reversetheaboveprocedure.Becarefultoassemble thecapacitordisktotheendofthestubsothatthe shouldersideofthediskfitsintotheendofthestub. Pushthefuseintothesplit-cupbolometersocketasfar asitwillgo. Theopeningsattheterminalendsofthestubsareidenticalsothat themaleconnectorassemblyorfemaleinputconnectorassembly maybeusedoneitherstub.Thisalsoappliestotheoutputcon- nectorassembly. BolometerReplacement TheModel475Bisshippedfromthefactorywitha1/100ampere instrumentfuseinstalledinthebolometersocket.These1/100 ampereinstrumentfuses,suchasthe#MJB-1/100fusemanu- -2- oj:. -.I U1 to o o - I - facturedbytheBussmanMfg.Co.,St.Louis7,Mo.,haveproven tobefullyequivalentinperformancetobarrettersuptoabout 3500MCwhenusedinatunablemount.Abovethisfrequency, powerreadingswillbelowerwiththefusethanwiththebarretter. Theerroramountstolessthan.5dbat4000MC. WhenusingtheModel475BinconjunctionwiththeModel430C,it isnecessarythatthe1/100ampereinstrumentfusehavesuitable resistancecharacteristics.Afusecanbeusedonanyrangeof theModel430Conwhichitispossibletosetthemetertozero. Mostfusesnotusableonthetoprangewillbeusableonsome lowerranges. SomeofthefusesfailingtozerowiththeModel430Cmaybe treatedtochangetheirresistancecharacteristicsandthusbring themwithintheoperatingrange.Thefuseshavingtoolowresis- tancearerunmomentarilyathigherthannormaltemperature. Thisresultsinapermanentincreaseinresistance.Thustreated, manyrefectedfusesmaybebroughtintotolerance. Acircuitforrapidlycheckingandtreating1/100amperefusesis shownbelow. COOK o CHECK 1/100 FUSE 0-20MA 1000 7.5V -3- Theprocedureforcheckingandtreatingfusesisasfollows:(Am- bienttemperatureshouldbe25 0 CloCduringthisprocedure.) 1.WithfuseclippedinandDPDTswitchinCHECKposi- tion,pushbuttonandadjust1000ohmpotentiometer untilgalvanometerreadszero(center).Meterindic- atestotalbridgecurrent,halfofwhichiscurrentre- quiredtomakefuseresistance200ohms.Ifbetween 8.50and9.00MA(17-18MAonmeter)fuseisusable.* 2.Ifmetercurrentisbelow17,fusecannotbeused. (Seenotebelow.) 3.Ifmetercurrentisabove18,throwswitchtoCOOK andadjustpotentiometertogiveapproximately12MA onmeter.Checkfuseagain.Repeat,increasing currentcautiouslyeachtimeuntilfusereaches200 ohmsatbetween8.50and9.00MA.Whencooking! temperatureisreached,thecurrentwillbeseento driftdownward.Donotholdthecurrentformorethan asecondorsoatatime. Twobarretteradaptersareclippedtothebottomplatenearthe maleconnectorassemblyparts.Theseareprovidedtoslipover theendsofaSperrybarrettertobringituptothedimensionsof afuse.Ifdifficultyisencounteredinmountingthebolometerin .thesplit-diskbolometersocket,itmaybesprungopenslightly withascrewdriver.Donotspringittoofarasthissocketmust makegoodcontacttothebolometer. AcapsuleenclosedbeadthermistorsuchastheW.E.TypeD166382 canbeusedifitisprovidedwithfuseorbarrettertypemountings. Anuninsulatedbeadtype,suchastheW.E.23A,canbemountedin aburnedoutbarrettercartridgeandused. THEORY Thebolometermountisessentiallyadouble-stubtransformer, usedtomatcha200-ohmloadtoa50-ohmline.Thestubsadd shuntsusceptanceattwopointsandthese,togetherwiththelength oflinebetweenthem,giveimpedancetransformationinamanner *Acurrentof8.50to9.00MAisspecifiedonthefuseforthe Model430Ctoworkatanyambientfrom0to500C.Fuseswhich are200ohmsatcurrentsjustbelowthismaystillworksatisfac- torilyat25 0C onallrangesandiftheydontworkonthe10MW range,maystillworkonlowerrangesbecauseofthegreater rangeofDCavailablethroughzerosetcircuit.Thesolecriterion inanycaseiswhethertheModel430Cmetercanbezeroset. -4- . . . I . o o p;1 l!l r- :- eD ;z: -:Ea ;z: II:l Do II:l R -t -. =x. . Pi-a II:l.Cola II: ;z: :E II:l :;, 10 II:l II: I a CD :N.:,:1*,:I:1: K :K:l:IX:,:I: .:1 o N1IS,I3:J1InOSN :1 oo,j :J.T o 475B8/22/56SerialllanGlabove475BOOl-l INPUTOUTPUT o SLIDING CONTACTS o oPANELCONTROL SCHEMATICDIAGRAMOFMODEL475BTUNABLEBOLOMETERMOUNT TABLEOFREPLACEABLEPARTS NOTE AnychangesintheTableofReplaceablePartswillbe listedonaProductionChangesheetatthefrontofthis manuaL Whenorderingpartsfromthefactoryalwaysinclude thefollowinginformation: Instrumentmodelnumber Serialnumber -hp-stocknumberofpart Descriptionofpart TABLEOFREPLACEABLEPARTS Circuit Ref.Description Knob InputConnectorAssembly: (Female) ConnectorAssembly: (Male) CenterConductorC: CenterConductorD: ThumbScrews: OutputConnectorAssembly: Capacitor: BolometerSocketA: BolometerSocketB: Pane1Plate: BarretterAdapter: -hp- StockNo. 37-13 475B-95A 475B-34S 475B-34K 475B-34Z 475B-34F 475B-95B 475B-95C 475B-34G 475B-34H 475B-43A 475B-34V Mfl.*&Mfrs. Designation HP HP HP HP HP HP HP HP HP HP HP HP Fuse,1/100amp_(treatedandselectedG28-AHP Thermistor NOTE AnychangesintheTableofReplace- ablePartswillbelistedonaProduc- tionChangesheetattherontofthis manual. Whenorderingpartsfromthefactory alwaysincludethefollowinginforma- tion: Instrumentmodelnumber Serialnumber -hp-stocknumberofpart Descriptionofpart 211-23HP *SeeListofManufacturersCodeLetter.ForReplaceablePartsTable. -10- CodeLetter A B C D E F G H HP I J K L M N o P Q R S T U V W X Y Z AA BB CC DD EE FF GG HH II JJ KK LL MM NN 00 PP QQ RR SS TT UU VV WW XX yy zz LISTOFMANUFACTURERSCODELETTERS FORREPLACEABLEPARTSTABLE Manufacturer AerovoxCorp. Allen-BradleyCo. AmperiteCo. Arrow,Hart&:Hegeman BussmanManufacturingCo. CarborundumCo. Centralab Cinch-JonesMfg.Co. Hewlett-PackardCo. ClarostatMfg.Co. CornellDubilierElec.Co. Hi-QDivisionofAerovox ErieResistorCorp. Fed.Telephone&:RadioCorp. GeneralElectricCo. GeneralElectricSupplyCorp. Girard-Hopkins IndustrialProductsCo. InternationalResistanceCo. Lectrohm,Inc. Littlefuse,Inc. MaguireIndustriesInc. MicamoldRadioCorp. OakMfg.Co. P.R.MalloryCo.,Inc. RadioCorp.ofAmerica SangamoElectricCo. SarkesTarzian SignalIndicatorCo. SpragueElectricCo. StackpoleCarbonCo. SylvaniaElectricProductsCo. WesternElectricCo. WilkorProducts,Inc. Amphenol DialLightCo.ofAmerica LeecraftManufacturingCo. Switcheraft,Inc. GremarMfg.Co. CaradCorp. AnytubehavingRETMAstandardcharacteristics. 90BY013 CLAIMFORDAMAGE IN SHIPMENT The instrument should be testedassoon asitis received.Ifitfails to operate properly,oris damagedinany way, a claim should be filed withthecarrier. A full report of the damage should be obtained by the claim agent,andthisreportshould be forwarded to us. We will then advise you ofthedisposition to be made ofthe equipment andarrangeforrepairorreplacement.Include modelnumberand serial numberwhen referring to this instrument for any reason. WARRANTY HewlettPackard Company warrants each instrument manufactured by them to be freefromdefectsinmaterialandworkmanship.Ourliabilityunderthiswarranty is limited to servicingoradjusting anyinstrumentreturned tothefactory forthat purpose and to replaceanydefectivepartsthereof.Klystron tubes as well asother electron tubes, fusesandbatteriesarespecifically excluded from any liability.This warrantyis effective for one year after delivery to the originalpurchaserwhenthe instrument is returned,transportationchargesprepaidbythe original purchaser, and when uponourexamination it is disclosed tooursatisfaction to be defective.If the faulthasbeen causedbymisuseorabnormal conditions of operation,repairs will be billedatcost.Inthis case,anestimate will be submitted beforetheworkis started. Ifany fault develops, the following steps shouldbetaken: 1. Notify us, giving full details of the difficulty, and include the modelnumber and serial number.On receipt of this information,wewill give you servicedata orshipping instructions. 2.On receipt of shipping instructions,forwardtheinstrument prepaid, tothe factoryorto the authorizedrepairstation indicated ontheinstructions.Ifrequested, anestimate of the charges will bemadebefore the work begins providedtheinstru ment is not coveredbythewarranty. SHIPPING All shipments of HewlettPackard instruments should bemadeviaTruckor Railway Express.Theinstruments shouldbepackedinastrongexteriorcontainer andsurroundedby twoorthree inches of excelsiororsimilar shockabsorbingmaterial. DONOTHESITATETOCALL ONUS HEWLETTPACKARDCOMPANY .eatat?Cl7ntam,ntl/04.anuuac? 275PAGEMILLROADPALO ALTO.CALIF. U.S.A. CABLEI.HEWPACK ,
