HP-100B-Manual 电路图.pdf

《HP-100B-Manual 电路图.pdf》由会员分享，可在线阅读，更多相关《HP-100B-Manual 电路图.pdf（10页珍藏版）》请在收音机爱好者资料库上搜索。

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 INSTRUCTION AmOPERATINGAAHUAL FOR MODElOOB LOWFREQUENCY STANDARD TypeNo.6548 HEWLETT-P

2、ACKARDCOl1PANY 275PAGEMILLROAD,PALOALTO,CALIORlA,U.S.A. RadioFans.CN 收音机爱 好者资料库 . LOWFREQUENCYSTANDARD MODEL100B CAUTION READBEFORETURNINGONTHEINSTRUMENT Theheatingofthecrystaloveninthisinstrumentisregulatedbyamer- cury-columnswitch.Occasionally,themercurycolumnisseparatedbyjarring andvibrationofthe

3、unitinshipment. Afterturningtheinstrumentonforthefirsttime,keepaclosecheckon thetemperatureofthecrystalovenasindicatedbythethermometerinthefront panel.Whentheinstrumenthasbeenonabout30minutes,thecrystalovenshould remainautomaticallyataratherconstanttemperature.Thisconditionwillbein- dicatedbyashutti

4、ngoffofthecrystalpilotlampfromtimetotime,andbythe factthatthethermometerwillreachafairlysteadyreadingofabout65degrees Centigrade. However,ifthecrystalpilotlightstaysoncontinuously,andifthether- mometergoesupbeyond70degrees,themercurycolumnintheswitchorther- mometerhasprobablybeenseparatedinshipment.

5、Turntheinstrumentoff immediatelyandproceedasfollows. Removeinstrumentfromcabinetandremovecrystalovenunitwhich plugsintubesocketadjacenttothermometerwindow.Removethermometer bracketandpullthermometercarefullyfromoven. Inspectthermometerformercurycolumnseparationandanyminute airbubblesinmercurybulb. I

6、feitherairbubblesorseparationarepresent,placethethermometer bulbinicewateruntilmercuryoccupiesonlythebulbcompartment.Tap lightlytoremoveanybubblesorglobulesleftincolumn. Thenplacethebulbinavesselofwaterandheatuntilmercurycom- pletelyfillscolumnandasmallportionoftheenlargementattopofcolumn. Thenremov

7、ethermometerandwatcmercurydescendtoroomtemperature. Ifthereisnoseparationorbubbles-present,thethermometermaynowbe putbackinservice.ItmaybenecessarytorepeattheaboveproceduremOre thanoncetouniteallthemercuryandremoveallbubbles. -CAUTION- RadioFans.CN 收音机爱 好者资料库 -CAUTION- Ifafterreplacingthecrystalandh

8、eater ll unitthecrystalheaterpilot staysonafterthermometerreaches70 0 pthemercuryswitchcolumnhasprob- ablyseparated.Proceedasfollows:Removecrystalovenunitandthermometeras describedabove.Removemercuryswitchbracketandthethreescrewsonthe outsidebottomofcastingandonescrewattopendofunit. Removecoverandli

9、ftinnerunitoutofcasting.Thenremovethemercury thermostatswitchfromitsrecessininnercasting. TounitethemercurycolurPlnandremovebubblespusesameprocedureas usedforthethermometer. CAUTION:Immergeonlybulbportionofmercuryswitch. Ifmercuryswitchleadsgetwetoranymoisturecollects beneaththeplasticinsulatorcover

10、ingthecotactrings.re- movetheplasticinsulatoranddrytubeandinsulatorand leadsthoroughlybeforeplacingbackinservice.Otherwise leakagebetweenleadsmaycauseheaterrelaytoremainop. Alsopwhenreplacingmercuryswitchdonotseatitanydeeper incastingthannecessary;otherwisethethermometerwillnot seattonecessarydepth.

11、 Reassemblethecrystalovenunitandplaceininstrument.Turnthein- strumentonandkeepacheckonthethermometertoascertainthattheswitch andthermometerreworkingproperly. -CAUTION- INSTRUCTIONS LowFrequencyStandard Model100B GEU.GRALDuCRIPTION TheModel100BLowFrequencyStandardconsistsofa100kc crystal-controlledos

12、cillator,andaseriesofthree10to1 regenerativemodulatortypefrequencydividersprovidingfre- quenciesof10kc,1kc,and100cps.Outputfromeachfrequency isbroughttoseparateterminalsattherearofthechassis throughbufferstageshavingalowoutputimpedance.Twoout- putterminalsarealsoprovidedonthefrontpanel,togetherwith

13、aswitchtoselectanyoneoftheoutptfrequenciesdesired. Outputonallfrequenciesisessentillysinusoidal. 100kcOscillator:The100kcoscillatorconsistsofa 100kccrystalhavingatemperature.coefficientof2cyclesper megacycleperdegreeCentigrade,inamodifiedColpittscircuit uinga6SJ7oscillatortube.Athermostatically-cont

14、rolledoven isemployedtoregulatethecrystaltemperature.Thecrystalis inserieswiththetankinductance,thecircuitoscillatingunder controlofthecrystalwhenthetamecircuitistunedapproxi- matelytothecrystalfrequency.Oscillationswillbemaintained overafairrangeofthetuningcapacitor,whichisusedto adjustthecrystalto

15、exactly100kc. FrequencyDividers:Thefrequencyofthe100kcoscillator isdividedinstepsof10to1,bymeansofthreeregnerative modulatortypefrequencydividers.Thefirstdividerstepsthe 100kcdownto10kc,theseconddividerstepsthe10kcdownto 1kc,andthethirdstepsthe1kcdownto100cps.Theaction ofallthreedividersisalike,alth

16、oughtheexactmethodof obtainingtheresultdiffersslightlyineach.Thefundamental actionisasfollows: Afrequencyfisintroducedintothefirstgridofa6L7 modulatortube,whichhasitsplatecircuittunedtoafrequency f/lO.Theplatecircuitisalsocoupledtooneofthegrids ofanother6L7actingasafrequencymultiplier,andhavingits p

17、latecircuittunedtoafrequency9f/lO.Theplatecircuitof themultiplierisinturncoupledbacktothethirdgridofthe modulatortube 2 . Assumeatransientofsonesorthasstarteasmallvoltage ofafrequencyf/10intheplatecircuitofthemodulator. Thisismultipliedbythemultipliertubetoafrequency9f/10, andfedtothethirdgridofthem

18、odulatorwhereitmixeswith thefrequencyLcominginonthefirstgridtogiveafrequency f-9f/10,orf/10,inthemodulatorplatecircuit,increasing thef/10voltagestartedoutbytheinitialtransient. Theactiongoesaroundthecircuitagain,thef/10voltage soonbuildinguptoastablemaximumvalue.Iftheincoming frequencyfisremoved,the

19、f/IOwillimmediatelystop,for thereisnothingtomixwithtomaintainitselfinoperation. Inordertofacilitutethemultiplyingactionincertain cases,someofthefre.uencyfisintroducedinoneoftheother gridsofthemultinliertubewhereamodulatingactionthentukes place,similartothatinthemodulatortube,thefr0uency!com- biningw

20、iththefrequencyf/10toiveafreuencyf-f/lO,or 9f/10,initsplatecircuit. BufferrtaGes:Outputfromthe100kcoscillator,andeach ofthedividersisakenfromseparatebufferstagesconsisting of6AC7s,triodeconnected,inacathodeloadcircuit.This providesalowoutputimpedance,sothatloadsaslowas1000ohms maybeplacedacrostheout

21、putwithoutappreciablyloweringthe outputvoltage.Thecathodeloadcircuitalsoprovidescomplete isolationofthedifferentoutputfrequencies. ow-rSuply:Thepowersources.10uldbea115volt,60cycle supplyline.Thehighvolta,eisobtainedfromanelectronically- regulatedrectifiersupplysothatthelinevoltaemayvary from105to12

22、5voltswithoutaffectingtheoperation.legulatin thehighvoltagesupplyalsoprovidesalowaudioimpedancein theplatesupplycircuit,andaidsinpreventinginteraction betueenthevariousoutputfrequencies OPEiATION InitialInstallation:Whentheinstrumentisfirstput intooperation,thefollowingprocedureshouldbeobserved: 1.I

23、lakesurealltubesarefirmlyintheirsockets,and thatthegridclipsareonllthe6L7tubes. 2.Followthecautionsonthefirctpageofthis.anual. 3.Plugpowercordintoa115volt,60cyclepowersupply. Itwilltakeabout24hoursofheatingforthecrystal itselftocomeuptotheroperoperationtemperature :3 Attheendofthattime,checktheratio

24、sbetweenthe variousfrequencydividerslithanoscilloscope,as fo110is: a.Connectthehorizontaldefectinglatestcthe10kc bindingpOS0S,andtheverticaldefleccingplatostothe100kc bindingposts.Astationarypatternwith10peaksacrossthe topshouldbeobtained.Ifthispatternisnotstationary,or isblurred,adjustthetuningcapa

25、citorinthe10kcdivider untilaclear,stationary10to1patternisobtained.The capacitorshouldbeleftinthecentralpositionbet,eenthe twopointswherethepatternceasestobestationary.Each dividercircuitisdirectlyinline,frontorear,withitscor- respondingoutputterminalsatthereurofthechassis. b.Repeataboveprocedure,us

26、ingthe10kcandthe1kc output,andthetuningcapacitoronthe1kcdividero c.Repeat,usingthe1kcand100cpsoutput,andthe ta-switchcapacitoradjustmentforthe100cpsdivider. Outputvoltacesfromallfre1ucnciesshGuIdbe5voltsor betteronopencircuitafteraboveadjustment.Theinstrument isnowreadyforoperation. Outputfromanyoft

27、heoutputfreuenciesmaybeobtained separatelyfromthemarkedbindincpostsattherearofthe chassis,orifdesired,anyofthefrequenciesmaybeobtained fromthebindingpostsonthefrontpanelbysettin0theselector switchtothedesiredfrequency.Outputatallfrequenciesis practicallysinusoidal,sothatfrequenciesmaybeusedfor frequ

28、encydeterminationbymeansofLissajousfiGuresuptohigh andcomplexratios. Loadingtheoutputwithlesthan1000ohmsloadwilllower theoutputvoltageconsiderably,andwillalsocausesomedis- tortionwhichmightbeobjectionableforusewithhighmultiple orcomplexpatterns.IfharmonicsoftheoutputBredeeired, seepage5forcompletein

29、structions. Adjustmentof100kcOscillatorFrequency:Thefrequency ofthe100kcoscillatorhasbeensetatthefactorytowithin acycleortvOof100kcattheexistingroomtemperature, Suchaccuracyissufficientformostpurposes,butifa closeradjustmentisdesired,itmaybeobtainedbytuninGthe smallself-lockin3variableaircapacitor,l

30、abeledFRE.ADJ. onthefrontpanel,andsettin;thecrystalexactlyto100kc bybeatingit,liththestandard5mesignal.fromfWVin/ashington, D.C.,pickeduponashortmvereceiver. / 4 . . NAINT:cnANC:2: AftertheinitialadjJstmentshDJ. ()cr! L4 1 Io MH I!c:-22nv VI.A/vV- . r- r; I IoJ 1-.1 1_- 33-.05J.dR40220l . 6n, .,. r)l I j I/) erl x 9 0 ii H . .+i- I1 f?:; ll Q:, :1. grgf-=-, -1-:- ,IL.1,l- L.R.5,C 8 . lJ n 0: 128fJ, .1t;l,IH 7 101torl!llL.:!oj co :la:itJll._ t : r.OlC) lJ IXU :x- C r-,_ 6:1 a:1= . A_ B I ,2A -J510GV ,1;0 -(J) .J fF:liill1 -FAH: - 6 SCHEMATIC DIAGRAMOF-hp-MODEL100BLOW FREQUENCY STANDARD