HP-100C-Manual-sn-57 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 j. INSTRUCTIONANDOPERATINGMANUAL FOR MODELlOOC LOWFREQUENCY STANDARD Serial57andAbove

2、HEWLETT-PACKARDCOMPANY 395PAGEMILLROAD,PALOALTO,CALIFORNIA,U.S.A. RadioFans.CN 收音机爱 好者资料库 TABLEOF9NTENTS CAUTION 1 . . . OPERATINGINSTRUCTIONS. SPECIFICATIONS. 3 4 Inspection InitialInstallation Controls GENERALINFORlfATION 5 lOOKCOscillatorCircuit FrequencyDividerCircuit Power Supply andVoltage Reg

3、ulatorCircuit BLOCKDIAGRAMOFNOD2LlOOC STANDARDIZATION-lITHTI1V 6a 7 SCHEMATICDIAGRAHFORUSEvilTH l1ULTIPLIERWITHMODELlOOC,106D.9 APPLICATION. . 10 TYPICALLISSAJOUSFIGURESHOWING. .11 POINTSOFTANGENCY TABLEOFREPLACEABLEPARTS MAINTENANCE . SCHEMATICRINGDIAGRAM. . . .11 lit .15 RadioFans.CN 收音机爱 好者资料库 .

4、u a a . PRODUCTIONCHANGES Serial57andAbove TableofReplaceableParts ChangeV7,V8,V9,V 10to: Tube:6CB6,HPstock#2l2-6CB6 ChangeV14to: Tube:6AV6.HPstock#2l2-6AV6 ChangeR9,R18,R27to: Resistor:fixed,composition,3900ohms,10%.1W HPstock#24-3900,Mfr.Allen-Bradley,#GB-392l ChangeR5,R15,R24to: Resistor:fixed,co

5、mposition,39,000ohms,10%,lW HPstock#24-39K,Mfr.Allen-Bradley,#GB-393l LOWFREQUEHCYSTAHDARD MODELlOOC Q1!T1.QN READBEFORETURNINGONTHEINSTRUffiNT Theheatingofthecrystaloveninthisinstrumentisregulated by amercury-columnswitch.Occasionally,themercurycolumnissep- aratedbyjarringandvibrationoftheunitinshi

6、pment. Afterturningtheinstrumentonforthefirsttime,keepaclose checkonthetemperatureofthecrystalovenasindicatedbythe thermometerinthefrontpanel.Whentheinstrumenthasbeenon about30minutes,thecrustalovenshouldremainautomaticallyata constanttemperature.Thisconditionwillbeindicatedby ashut- tingoffofthecry

7、stalovenindicatorlampfromtimetotime,and bythefactthatthethermometerwillreachasteadyreadingof 650c2oC. Howeverifthecrystalpilotlightstaysoncontinuously,or thethermometergoesup beyond 70degrees,themercurycolumnin eitherthethermostatorthethermometerhasprobablyseparatedin shipment.Turntheinstrumentoffim

8、mediatelyandproceedasfollows; 1.Removetheinstrumentfromthecabinetandremovethe crystalovenunitwhichplugsintotubesocketadjacenttothermo- meterwindow. 2.Disconnectthethermostatwiresfrolltheterminals(#3,Fig. 1).Removethethermostatclamp byunscrewingthetwoscrews(#4, Fig.1).Drawthethermostatoutoftheoven.(#

9、5,Fig.1) 3.Inspectthethermostatformercurycolumnseparationand minuteairbubblesinthemercurybulb. 4.Ifeitherairbubblesorseparationarepresent,placethe mercuryswitchbulbinicewateruntilmercuryoccupiesonlythe ,bulbcompartment.Taplightlytoremoveairbubblesormercury globulesleftincolumn . Thenplacethebulbinav

10、esselofwaterandheatuntilmercury completelyfillscolumnandasmallportionoftheenlargementat thetopofthecolumn.Then removethethermostat andvlatch the umercurydescenttoroomtemperature.Ifthereisnoseparationor Qbubblespresent,thethermostatmaynowbeputbackinservice.It maybenecessarytorepeattheaboveproceduremo

11、rethanonceto uniteallthemercuryandremoveallbubbles. ?CAUTION:Immerseonlythebulbportionofthethormostat.If thethermostatleadsgetwetoranymoisturecollectsbeneaththe .)plasticinsulatorcoveringthecontactrings,removetheplastic -1 - i insulatoranddrytubeandinsulatorandleadsthoroughlybefore placingbckinservi

12、ce.Otherwise,leakagebetweenleadsmay causeheaterrelaytoremainopen. 5.Unscrewthetwonutsholdingthothermometer clamps(#2, Fig.l),andwithdrawthermometer fromtheoven. 6.Tounitethemercury column and removeairbubblesinthe thermometer,usethesameprocedureasthatusedonthethermostat. 7.Replacethethermostatand th

13、ermometerinthecrystaloven; turnontheinstrumentandobserveovontemperatureandoperation oftheovenindicatorlamp -2 - INSTRUCTIONS HODEL100C SECONDARYFREQUEnCYST.ITD.:aD SPECIFICATIONS outputRating- OutputFrequency 100cyclespersecond 1000cyclespersecond 10,000cyclespersecond 100,000cyclespersecond Voltsin

14、to5000ohmsload 5minimum 5 minimum 5 minimum 5minimum Distortion- 4atallfrequencieswith5000ohmsload. Internalimpedance-200ohmsload. QuartzCrystal- 100kc Wattage- - -140watts PowerSupplyRating- Voltage- - -105to125volts QuartzCrystalOven- Heatervoltago6.3v Oventemperature65C 50to60cyclesFrequency Over

15、allDimonsions- CabinetHodel -23t19 x12thX14-7/16d Rackllodel- -1919 xloth x14-7/16d veight 38lbs. 28lbs. - 3 - , TubeComplement- VI V2a, b V3 v4 V5a V6 V7 v8 V9 VIa VII V12 V+3 v14 V15 6BH6 6AL5 6As6 6AS6 6AL5 6AS6 6AH6 6AH6 6AH6 6AH6 5R4GY 6L6G 6L6G 6AQ6 OA2 Oscillator Rectifier FrequencyDivider Fr

16、equencyDivider Rectifier FrequencyDivider 100kcisolatingamplifier 10kcoutputisolatingamplifier 1000cyclesoutputisolatingamplifier 100cyclesoutputisolatingamplifier PowerSupplyRectifier VoltageRegulator VoltageRegulator VoltageRegulator VoltageRegulator OPERATINGINSTRUCTIONS Inspection- Thisinstrumen

17、thasbeenthoroughlytestedand inspectedbeforeboingshippedandisreadyforusewhen roceived. Aftertheinstrllientisunpacked,thecovershouldbo removed(SeeMaintenanceSection)sothattheinstrumentmaybe carefullyinspectedfordamageroceivedintransit.Whiletho coverisoff,thetubesshouldbechockedtoseethattheyare firmlys

18、eatedintheirsockets.Ifanyshippingdamageisfound, followtheprocedureoutlinedintheClaimforDamageinShip- mentpageatthebackofthisinstructionbook. InitialInstallation- BeforeinstallingtheModellOOC,makesurethatthe tubesandrelayaresecureintheirsockets. Theinstrumentshouldbesituatedsothatthereis adequatevent

19、ilation.Lackofproperventilationmaycausethe ambienttemperatureintheinstrumenttorisehighenoughso thattheOV0nthermostatwilllosecontrol. ObservetheCautionregardingthecrystaloven,in thefrontofthisbook,beforeturningonthepower. Afterthepowerison,severalhourswillelapsebe- forethecrystaloventemperaturebecome

20、sconstant.Theinstru- mentshouldberuncontinuouslysothatthetemperatureofthe componentsreachesasteadystateandconstantoutputfrequen- cieswillbemaintained.Continuousoperationoftheinstrument willalsoimprovethestabilityofthecrystal. Lowcapacityshieldedwireshouldbeusedtodistrib- - 4 - utetheoutputvoltagesto

21、theequipmentundertestasitwill preventthepick-upofextraneousvoltages.Theshieldbraidon thewireisconnectedtotheGbindingpostsoftheinstrument. Tomaintaina minimumoutputvoltageof5volts,ateachfrequen cY, aloadofnotlessthan5000ohmsimpedancemaybeconnected acrosstheoutputterminals.Thefollowingtablegivesthemax

22、- imumcapacitythatcanbetoleratedwithoutexceedingtheabove conditions. Frequency 100KC 10KC 1KC 100cycles CapacityforCapacitiveReactance 5000ohms .0003mf .003mf .03m.f .3mf () , MaximumcapacityacrossoutputterminalRaMax.lengthof Capacityemfperfoot)ofwireshioldedwire Thelengthoftheshieldedline,carryingt

23、helOOKCmay beextendedbyconnectinga100KCtunedcircuitacrosstheline. Thistunedcircuitconsistsofaninductanceinparallelwitha variablecpacitor.Tunethecapacitorformaximumoutput. ControlsandTerminals- FREQ.ADJ. -SeesectiononStandardizationwithvl,lVforthe useofthiscontrol. POWER-ThisswitchcontrolsallpOv!ersu

24、ppliedtotheinstru- mentfromthepowerline. OUTPUTSELECTOR-Thisswitchconnectsanyoneofthefourfre- quenciestotheoutputbindingpostsonthefrontpanel. FUSE-thefuseholder,locatedonthebackofthechassis,con- tainsa1.5amperecartridgefuse.Thefusemaybereplacedby unscrewingthefuseholdercapandinsertinga newfuse. Powe

25、rCable-Thepowercableconsistsofthreeconductors.Two oftheseconductorscarrypowertotheinstrumentwhilethethird conductor(groenwire)isconnectedtotheinstrumentchassis. Thethirdwireprojectsfromthecableneartheplugendofthe cableandmaybeconnectedtoagroundwhenitisdesirableto haveagroundedinstrentchassis. Output

26、BindingPosts- Thefoursetsofbindingpostsonthe backofthechassisaretheoutputterminalsforthefourfre- quenciesgeneratedbytheinstrument.Theaindingpostsmarked Gareconnectedtothechasses. GENERALINFORHATION TheHewlett-PackardLowFrequencyStandardModellOOC isanaccurateandstablesecondaryfrequencystandard.Itmay

27、- 5 - - 6 - I bestandardizedwiththeBureauofStandardstransmissionsfrom iNatintervalstomaintainahighorderofaccuracy. The Model 100Cconsistsofacrystal-controledoscil- latoroperatingat100KCwhichcontrolsthestabilityofall frequenciesgeneratedbytheinstrument.Thefrequenciesof 10KC,lKCand100cpsareproducedby1

28、0:1cascadedfrequency dividerswhicharedrivenbythe100KCprecisionoscillator. Eachdivideroperatesitsownisolatinaplifiersothatall sinewavesgeneratedbythoinstrumvntareindependentlyavail- albeforexternaluse. Aregulatedryowersupplydeliversallnecessaryvolt- agestotheinstrumentandmaintainsaconstantvoltagewhic

29、h contributestotheexcellentstabilityoftheinstrument. 100KCOscillatorCircuit- The 100KCoscillatorisamodifiedPiercecircuit.This circuitallowsthefrequencytobechangedlcpsbychanging thecapacityacrossthecrystal.Averylowtemperaturecoef- ficientcrystalheldataconstanttemperatITecontrolsthefre- quencytowithin

30、10partspermillionatnormalroomtemperature. FrequencyDividerCircuit- Thefrequencydividercircu11S composedof(seeFig. 2)tubesV2,V3andassociatedconponents.TubeV3istheactu- alfrequencydivider,operatingasacontrolledone-shotmulti- vibrator.Thetimeconstantsofthecircuitareadjustedsott thecircuitistriggeredbye

31、verymnthcyclooftheoscillator. Assumingfora momentthattheoscillatorisnotoper- ating,theoperationofthecircuitcanbedescribedasfollows: InaquiescentstatetubeV3operatesinsuchalnnerthatthe plateisatahighervoltagethanthescreengridbutdrawsno current.Thisisexplainedbythefactthatthesuppressorgrid issufficient

32、lynegativewithrespecttothocathodetocutoff theplatecurrent.Thereforethescreengridactsasaplate forthospacecurrent.Thecontrolgridisatcathodepotential andisthusdrawinghoavycurrent.ThocathodeofDiodeV2is connectedtoahigherdcvoltagethanitsplatesothatV2isan opencircuittopositivevoltagesandtosoallnegativevol

33、tages appliedtoitscathode.Thenegativeportionoftheoscillator islargeenoughtopassthroughdiodeV2andtriggeramulti- vibratoractioninV3:ThenegativevoltageispassedfroLlthe plateofV3tothecontrolgridthroughCl.Thenegativecon- trolgridreducesthespacecurrent,causingthescreenvoltage toriseandthecathod8voltagetof

34、all.Thisactionroduces thesuppressorbiaswithrespecttothecathodesufficiently thatcurrentpassesthroughthesuppressorgridtotheplate. TheplQtevoltagethereforedropsrapidly,reinforcingtheorig inalnegativevoltageonthecontrolgrid.Becausetheplate voltageonV3isnowlow,theplatoofV2isatalowervoltage thanitscathode

35、andnonegativetriggervoltagescanpass throughdiodeV2. .:J.1.L . - C al_ . 10v ividor 1C Divider_.fL 100V Ivider , .:-: .n.JL.SL . tV - Isolatln Isol1tnIsolatingIsolating .;lifierA:l1p1ljor;l.1nplifierAmplifier , ,Ir rvtVrv 010KC()1r:C I () 100 .1 10cycles I I a- I I f_ - 1 0 I 1cycleI I I I rv ()100KC

36、 .;:.100:COsc- Volteat .inUtto .ivlder I J -_-_1- 10KCDividerI vutputVoltageJ. atScreenGr dI- -6a- R2 FIG.2BASICCIRCUITOF FR2QUElTCYDrllDER NextDivider B+ 10KCOutput )S IV.) . 1 J () I;) I ( Thecircuitremainsinthisconditionasthenegative chargeonthecontrolgridleaksoffthroughresistorR2.As thegridvolta

37、geslowlyrises,thespacecurrentinthetube slowlyincreases,causingtheplatevoltagetodropsomemat more.Atthesametimethecathodevoltageslowlyrises,in- creasingthebiasonthosuppressorgrid.Finally,acritical pointisreachedwherethescreenhasmoreattactlonforthe spacecurrentthantheplate. :Jhenthiscriticalpointisreac

38、hed,thesecondpor- tionofthemultivibratoractionoccurs:Thescreenvoltage f31lsrapidlyandplatecurrentceases.Thisactionttansfers apositivevoltagetothocontrolgrid,resultinginmorespace currentandreinforcingthedropinscreenvoltage.Thecir- cuitthenbecomesquiescentandispreparedforthenextneg8- tivepulsethroughD

39、iode V2a.Thetimeconstantsinthecir- cuitareadjustedsothatthetotalmultivibratoractionre- quiresslightlymorethanninecyclesofthooscillatorfre- quency,thecircuitbeingagainreadyfortriggeringontho tenthcycle.Thus,afrequency-dividingactionhasoccurred. Thisdividercircuitishighlystableandwilloperate forlongpe

40、riodsoftiewithoutcorrection. Thesinusoidaloutputfromthedividerisobtained from atunedcircuitthatisconnectedtothescreengridof V3throughalargeisolatingresistor.Thissinusoidalwave isrelativelyharmonic-free,havinglessthan4%distortion. Theremainingdividercircuitsateconnectedincas- cadeandaredrivenfromthec

41、athodeoircuitofV3.Arectang- ularwaveispresentatthecatodeandthiswave,afterdif- ferentiation,triggersthefollowingdivider.Thoremaining dividercircuitsoperateinananersiillilartothocircuitof V3,themajordifferencebeingthatthetimeconstantsaread- justedtoaccomodatethelowerrepetitionratosinvolved. Eachdivide

42、risconnectedtoitsownisolatingamp- lifier.Thisamplifierisolatesthedividerfromvariableex- ternalloadsandprovidesa lowimpedanceoutput. PowerSupplyandV91tagoRulatorCircuit- The powersupplyconsistsofatransforDertosupply thenecessaryvoltagesandaconventionalfull-waverectifier andfiltersystemtoconvertaltern

43、atingcurrenttodirect current. STANDARDIZATIONWITHl.JI,lV ThelOOKCoscillatorcircuitoftheModellOOCisset tolOOKCatthefactoryanditvlillmaintainthisfrequency within.OOl%(10partspermillion)ontherangeofnormal - 7 - roomtemperatures.Thisdegreeofaccuracyissufficient formanypurposes.Foragreaterdegreeofaccurac

44、ythe 100KCoscillatorshouldbestandardizedwithaprimaryfre- quencystandardatfrequentintervals. Themostaccessibleprinaryfrequencystandardis thestandardfrequenciesbroadcastbytheNationalBureauof StandardsStationVVatWashington,D.C.Thisservicemay beutilizedtocheckthoHodel 100Cbyemployingashortwave radiorece

45、iverandafrequencymultiplier. Station:Nbroadcastsstandardfrequenciestwenty- fourhoursa day onthefolloungfrequencies:2.5,5,10,15, 20,25,30and35megacycles.Forthelatestinformationon usingthisserviceaBureaubfStandardsCircularMethodsof UsingStandardFrequenciesBroadcastbyRadiomaybepurchased fromtheSuperint

46、endentofDocumants, GovernmentPrintingOffire, Washington,D.C.AdetailedannouncementofvNbroadcast services,1c886willbeprovideduponrequestfromtheNational BureauofStandards,Tashington25,D.C. Aschematicwiringdiagramforasuitablemulti- plierisshownintheaccompanyingillustration.Thiscircuit willgivemultipleso

47、f100KCsothtasignalisobtainedon nIlthe-.!vNtransmissionfrequencies.Awir8froDtheantennn terminaloftheshortwavereceiverlooselycoupledtoCoil 11providesasignaltomixuththesignalfromW1.VV.This couplingshouldb8varieduntilitisapproximtelythesane strengthasIr,!v. Theadjustmentofthe100KCoscillatorontheHodel lO

48、OCisperforcdasfollows: 1.Feedthe100KCoscillatoroutputthroughthe multipliertother2.dioreceivertunedtothehighestTf,IV frequencyprovidingthebestsignal.ThehighertheNfre- quencyused,thegreatertheaccuracyobtainedincalibrating the100KCoscillntor.Headphonesor10udspeak8rroybeusedto indicatethepresenceofabeat

49、betleentho100KC05cil1ator andT/f,lV. 2.Ifaboatnoteispresentthe100KCoscillator hasdriftedfromitscorr8ctfrequency.ToreturntheHodel 100Coscillatortoexactly100KCitisnocessarytotun8the FREQ.ADJ.11capacitorintheo1.1erleftcornerofthefront panel.Turnthiscontrolint hedirectionthatproducesa decreaseinthopitchuntilthezerobeatpointisreachedand thenincreaseinpitchasrotationiscontinued.Atthezero bentpointthe100KCoscillatorwillbostandardizedwithN. 3.S