HP-335E-Manual 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 INSTRUCTIONANDOPERATINGMANUAL FOR MODEL335E TVMONITOR Serial-Jj: HEWLETT-PACKARDCOMPAN

2、Y 395PAGEMILLROAD,PALOALTO,CALIFORNIA,U.S.A. t.r, RadioFans.CN 收音机爱 好者资料库 GeneralDescription TheModel335ETelevisionMonitorisdesignedtogiveacontinuous indicationofthefrequencydeviationoftheauralandvideotransmittersandthe modulationpercentageoftheauraltransmitterofaTVstation.Thefrequency rangeofthisin

3、strumentcoversallTVchannels,2to83. TheModel335Ealsoincludesapeakmodulationindicatorwhichmaybe settogiveawarningwhenthemodulationexceedsanypre-determinedvalue between50%and120%.Provisionhasbeenmadefortheoperationofremote indicatingmetersaswellasaremotepeakmodulationindicator.Anaudioout- putvoltageisa

4、lsoavailableformeasurementpurposes. CAUTION READTHEINSTALLATIONANDOPERATINGINSTRUCTIONSCAREFULLY BEFOREATTEMPTINGTOUSETHISINSTRUMENT. PartsSubstitutions Difficultiesinprocuringsomeofthepartsusedinthisinstrumentmay causetheelectricalorphysicalvaluestodeviatefromthoseshowninthisin- structionmanual.The

5、sesubstitutionshavebeenmadesoasnottoimpairthe performanceofthisinstrument.Wheneverreplacementofanyofthesepartsis necessary,eitherthesubstitutevalueortheoriginalvaluemaybeused. RadioFans.CN 收音机爱 好者资料库 INSTRUCTIONS MODEL335E TVMONITOR Specifications CarrierFrequencyRange Channels2 -83inclusive,includi

6、ngoffsetchannels. Thisinstrument,Serial15,isadjustedforthefollowingcarrier frequency.- Channel 12 Offset 10ke AuralCarrierFrequency 209.76 MasterOscillator CrystalFrequency 26.2012$0 VisualCarrierFrequency 205.26 VisualFrequencyMonitor DeviationRange-!l.5Kcfromassignedfrequency. Accuracy-Betterthan!

7、500cycles/secondforatleasta10dayperiod. AuralFrequencyMonitor- DeviationRange-6Kcfromassignedfrequency. Accuracy-Betterthan!l.000cycles/secondforatleasta10dayperiod. AuralModulationMeter Range- 0-1330/0,Meterindicates1000/0ona25Kcswingand1330/0fora 33.3Kcswin*. Accuracy-Within_50/0overentirescale. I

8、ndicatingMeterCharacteristics-MeterdampedinaccordancewithF.C.Co requirements. FrequencyResponse-Flatwithin!1/2dbfrom50to15,000cycles/second. PeakModulationIndicator- Adjustabletoindicatemodulationinexcessofanypredeterminedper- centagebetween50%and120%. AudioOutput- FrequencyRange50to15,000cps.Respon

9、seflatwithin!1/2db.Equip- pedwithstandard75microsecondde-emphasiscircuit. -1- Distortion-Lessthan.250/0at1000/0m.odu1ation. OutputVoltage-10voltsinto100,000ohm.sat1000/0m.odulationatlow frequencies. MonitoringOutput- 1m.illiwattinto600ohm.s,balanced,at1000/0m.odu- lation,atlowfrequencies. ResidualNo

10、ise-Atleast60dbbelowoutputlevelcorrespondingto1000/0 m.odulationatlowfrequencies. R.F.PowerRequired- Visualandauralcarrierseachrequirelessthan1watt. ExternalMeterTerm.inals- Term.inalsareprovidedforconnectingexternalm.eters(auralandvisual deviation.auralm.odulation)andapeakm.odulationindicatorlam.pt

11、otheinstrum.ent. PowerSupplyRating- Voltage-115volts Frequency-50/60cycles/second Wattage-180watts AccessoriesFurnished Cables- TypeofCable Power3cond.rubber covered Connectors - Length 7-1/2ft. Term.inations Motorbaseplugone end- 2prongplug otherend. 12-1/4highx19widex15deep. Weight- 60pounds. Type

12、 UG21B/U OverallDim.ensions QUcantityFurnished 2 -2- OperatingInstructions Inspection- Thisinstrumenthasbeenthoroughlytestedandinspectedbeforebeing shippedandisreadyforusewhenreceived. Aftertheinstrumentisunpacked,itshouldbecarefullyinspectedfor damagereceivedintransit.Ifanyshippingdamageisfound,fol

13、lowtheprocedure outlinedintheClaimforDamageinShipmentsectiononthelastpageofthis instructionbook. ControlsandTerminals CRYSTALTEMPERATURE-Thisthermometerindicatesthetemperature ofthemasteroscillatorcrystaloven. PEAKMODULATIONINDICATOR-Thisredindicatorlamplightswhen- evertheauralmodulationpercentageex

14、ceedsanypre-determinedvaluebetween 50%and120%. 50%-120%-Thiscontrolisprovidedtosetthemodulationpercentage abovewhichthePEAKMODULATIONINDICATORlampwillbelighted. A -TheVISUALCARRIERDEVIATIONmeterpointerissettozerowith thiscontrol.(SeeMaintenanceSection). B -ThiscontrolisusedtoadjusttheVISUALCARRIERDE

15、VIATIONmeter calibration.(SeeMaintenanceSection). CRYSTALTUNING-Thisvariablecapacitorisprovidedtoadjustthe masteroscillatorcrystalfrequency. J1-ThephonejacklabeledJ1isprovidedsothatanaudiovoltagemay beapplreatothevisualamplifierandcountercircuitforthepurposeofcali- bratingtheVISUALCARRIERDEVIATIONme

16、ter. TEST-Thispushbuttonisprovidedsothatasimpletestmaybemade todeterminewhetherornotthevisualcarrierhasdeviated7Kcandtherefore isproducingafalsezeroindicationontheVISUALCARRIERDEVIATIONmeter. CARRIERLEVEL-CALIBRATE-Thefunctionofthisswitchisto connectthecircuitsandmetersinthevariouscombinationsrequir

17、edtomonitor theauralandvisualtransmitters,checkontheperformanceoftheinstrument, andtodetermineifanadequatecarrierlevelisavailabletooperatetheinstrument. Listedbelowaretheswitchpositionsandthefunctionsperformedateachposition. CARRIERLEVEL-InthispositiontheVISUALCARRIERDEVIATION meterandAURALCARRIERDE

18、VIATIONmeterare connectedtomeasuretheleveloftheirrespective carriers.TheAURALCARRIERMODULATIONmeter doesnotfunctionwiththeswitchinthisposition. -3- 1 -TheAURALCARRIERMODULATIONmetermeasuresthegrid currentofthefirstmultiplierwhentheswitchissettoposition1. Theothertwometersmeasurethegridcurrentoftheir

19、respective mixers. USE-Inthispositiontheinstrumentisconnectedtomonitorthetele- visiontransmitter. 2 -ThispositionoftheswitchconnectstheVISUALCARRIERDEVIATION metersoastomeasurethegridcurrentofthe4.3535Mccrystal oscillator.TheAURALCARRIERDEVIATIONmeterandtheAURAL CARRIERMODULATIONmeterindicationshave

20、nosignificance. CALIBRATE-InthispositiontheVISUALCARRIERDEVIATIONmeter isusedtomeasurethegridcurrentofthe150Kcoscillator. TheAURALCARRIERMODULATIONmeterandtheAURAL CARRIERDEVIATIONmeterareconnectedsothattheir calibrationsmaybeadjustedbythecontrolsCandD respectIvely. POWER-Thisswitchconrolsallpowersu

21、ppliedtotheinstrumentwith theexceptionofthecrystalovenheatercircuits.Thecrystalovencircuitsare energizedatalltimesformaximumstability. FUSE-Thefuseholder,locatedonthecontrolpanel,containsa3.2ampere cartridgefuse.Toreplacethefuse,unscrewthefuseholdercap,removethe blownfuse,andreplacewithanewfuseofthe

22、Slo-blotypeasspeCifiedinthe ReplaceablePartsTable. C -Thiscontrolisused0adjusttheAURALCARRIERDEVIATIONmeter pointertozero.(SeeMaintenanceSecion). D -ThiscontrolisusedtosettheAURALMODULATIONmeterto1000/0. (SeeMaintenanceSection). MODULATIONPOLARITY-ThepOSitionofthisswitchindicatesthe polarityofthemod

23、ulationindicaedbytheAURALCARRIERMODULATIONmeter. EXTERNALMETERS AURAL-MOD-VISUAL-Thesethreecoaxialjacks(J4pJ6pJ7)arepro- videdforconnectingexternalmeterstotheinstrument.Wheneverexternalmeters arenotconnectedtotheterminalspthedmmymeterloadsfurnietlwiththe instrumentmustbeconnected.Thedu:rn.mymeterloa

24、dsare3000ohmseach fortheAURALandVIsuALterminalsand1000ohmsfortheMOD.terminal. 1 - 8-Theterminalsonthisterminalboardareidentifiedasfollows LowZ(land2)- -Lowimpedanceaudiooutputterminalformonitori:;1.g purposes.Terminals3and4mustbetiedtogetherto obtaintheaudiovoltageatterminals1and2.Onemilli- wattinto

25、600ohms,balancedpat100%modulationatlow frequenciesisavailableacrossterminals1and2.This outputisequippedwih astandard75microsecondde- emphasiscircuit. -4- - .1 - - $ .:l , 3351/22/54Serial.1andAbove lI + Jt o o HI-Z(4and5)-TenvoltsintolOa,000ohmsat100%modulationatlow frequencies.Thisoutputisequippedw

26、ithastandard75 microsecondde-emphasiscircuit. 6-Thisterminalisprovidedforconnectingtestequipment totheinstrumentforcalibratingtheAURALCARRIER MODULATIONmeter.TheIFfrequencymayalsobe measuredatthisterminal. Lamp(7and8)-Anexternalpeakmodulationindicatorlampcanbecon- nectedtotheseterminals.A120volt,3or

27、6wattlamp shouldbeused. FUSE-1/2AMP.-Thefuseholder.locatedonthebackoftheinstru- ment,contains1/2amperecartridgefuse.Toreplacethefuse,unscrewthe fuseholdercap,removetheblownfuse,andreplacewithanewfuseofthe sametype. Thisfuseprotectsthecrystalovenheatercircuit. J5-Thisjackprovidesaconnectionformeasuri

28、ngthespuriousampli- tudemodUlationontheauralcarrier. RFINPUTS- AURAL-Thiscoaxialconnectoristheinputterminalforthe coaxialcablefromtheauraltransmitter. VISUAL-Thiscoaxialconnectoristheinputterminalforthe coaxialcablefromthevideotransmitter. PowerCable-Thisisaspecialthreeconductorcablewithastandard tw

29、oprongmaleplugmoldedononeendandatwocontactmotorbaseplugon theotherend.Thethirdconductor(green)protrudesfromthepowercable neareachplugandmaybeusedtoconnecttheinstrumentchassistoanexternal ground. Installation TheModel335ETelevisionMonitorisdesignedtobemountedina standardrelayrack.FQrdependableoperati

30、onthemonitorshouldbeinstalled inawellventilatedrackwheretheairtemperaturedoesnotexceed113 0 F(45 0C.). Itisalsoimportanttoleaveclearancebehindtheunittoallowadequatepassage ofairthroughtheairfilte.rinthe.backofthedustcover. Externalmetersandanexternalpeakmodulationindicatorlampassembly maybepurchased

31、fromtheHewlett-PackardCompany.Writethefactoryifyou desireanyoftheseaccessories. Allconnectionstothemonitorshouldbemadewithshieldedcablewith theexceptionofthepowercordandthewiringfortheexternalpeakmodulation indicator.BothRFinputsandtheexternalmeterconnectionsshouldbemade withcoaxialcable,theaudioout

32、putconnectionsshouldbemadewithdouble conductorshieldedwire. -5- CoaxialCablesandConnectors- FunctionCableConnector RFINPUTS EXTERNAL METERS RG-9/U.RG-S/U,RG-9A/U,RG-lO/U RG-55/U,RG-5S/U RG-55/U CAUTION UG-21B/U,UG-21D/U UG-536/U DonotattempttoadjusttheCRYSTALTUNINGcontroluntiltheinstru- menthasbeenc

33、ompletelyInstalledandconnectedtothepowerlineforacontinuous periodof24hours. WhencouplingthemonitortothetransmitternevercoupleexceSSIvepower intothemonitor.AfractionofonewattisalltheRFpowerrequiredbyt emoni- torfromeachtransmitter.ExcessIveinputmaypermanentlydamagetheRF sectionoftheinstrument. Whenin

34、stallingthemonitorfollowthestepbystepprocedureoutlined below.Theinstrumenthasbeenthoroughlytestedbeforeshipmentandshould requireonlyminoradjustmentsduringinstallation. InitialInstallationProcedure- 1.ConnecttheInstrumenttothepowerline(115volt100/0.50/60)and allowittowarmupforatleastonehour.WatchtheC

35、RYSTALTEMPERATURE thermometerduringthiswarm-up;itshouldnotexceed6SoC(outsidegreensector). IftheCRYSTALTEMPERATURErIsesabove6SoC.itindicatesthattheunit shouldbedisconnectedfromthepowerlineandthemercurythermostatinthe crystalovenrenlovedandexanlined.Inmostcasesthethernloscatcanberestore.i tocorrectope

36、rationbyrepeatedheatingandcooling.Thiswillunitethemercury columnandtheunitwilloperateproperly.SeetheMaintenancesectionofthis manualforthecompletecrystalovenserVIceprocedure. 2.ConnectthedUnlmymeterloads(threeareprovidedwitheachinstru- ment)totheEXTERNALMETERJacksontherearoftheinstrument.The1Oli ohml

37、oadshouldbeconnectedtotheMOD.jackandthe3000ohm1adsconnected totheAURALandVISUALJacks. 3.SettheFunctionSelector(behindthedooronthepanel)totheCALI- BRATEposition.AdjustcontrolCuntiltheAURALCARRIERDEVIATION meterindicatesexactlyzero.AdjustcontrolDuntilthePERCENTMODULA- TIONmeterindicatesexactly100%.The

38、secontrolsadjusttheauralcct.er circuitsforcorrectoperation. -6- .I ,. CC t ,.,. p - . - o . d - 4.ThissteprequiresanexternalaudioosclllatorsuchastheHewlett- PackardMdtlel200ABorModel200CD.SettheFunctionSelectortotheUSE position.Adjusttheoscillatorforapproximatelyonevoltoutputat.l5.Q.Q.cycles/ sec.an

39、dconnectittoJ1onthepanel.AdjustcontrolAuntiltheVISUAL CARRIERDEVIATIONmeterindicatesexactlyzero.Settheaudiooscillator foronevoltoutputat5000/sec.andadjustcontrolBuntiltheVISUAL CARRIERDEVIATIONmeterindicatesexactly+1.5Kc.Changetheoscillator outputto1Q.Q.Pcycles/sec.,theVISUALDEVIATIONmetershouldindi

40、cate -1.5Kc.Ifitdoesnot,re-adjustcontrolBuntilequalaccuracyisobtained atbothendsofthedeviationmeterrange.TheVISUALCARRIERDEVIATION metercircuitsarenowcalibrated. 5.SettheFunctionSelectorswitchtothe1position.TheVISUAL CARRIERDEVIATIONmetershouldindicateatleast+.5Kc(RFinputsnot connected),andtheAURALC

41、ARRIERDEVIATIONmetershouldindicateat least+2Kc.Iftheydonot,refertotheMaintenancesectionofthismanual. 6.SettheFunctionSelectorswitchtothe2position.TheVISUAL CARRIERDEVIATIONmetershouldindicateatleast+.5Kc.,ifitdoesnot, refertotheMaintenancesectionofthismanual. 7.SettheFunctionSelectorswitchtotheCARRI

42、ERLEVELposition. ConnecttheVISUALRFINPUTtothesamplingprobeinthevisualtransmitter andadjusttheprobeuntiltheVISUALCARRIERDEVIATIONmeterindicates between+.5and+1.5Kco(Novisualmodulationshouldbeappliedtothevisual transmitter,otherthansynchronizingpulses;1.e.,thevisualtransmittershould betransmittingabla

43、cklevel.)ConnecttheAURALRFINPUTtothesampling probeintheauraltransmitterandadjustthisprobeuntiltheAURALCARRIER DEVIATIONmeterindicatesbetween+2and+6Kc. 8.SwitchtotheUSEposition.PresstheTESTswitch;theVISUAL CARRIERDEVIATIONmeterindicationshouldincrease(deflecttotheright) between100,and1Kc.Thisindicate

44、sthatthemonitorisproperlytunedfor thechannelinvolved.Ifthisindicationisnotobtained,refertotheMaintenance sectionofthismanual. 9.Theremainingconnectionsshouldbemadeattherearoftheinstru- mentasfollows: ExternalMeters-Removethedummymeterloadsandconnectthe externalmeterstotheirappropriateJacks. External

45、PeakModulationIndicator-Anexternalindicatormaybecon- nectedtoterminals7and8onthebackoftheinstrument.A120 volt,3or6wattlampshouldbeusedforthispurpose. AudioOutput-600ohmsbalancedoutput,connecttoterminals1and2 andjumperterminals3and4.Highimpedanceunbalancedoutput, connecttotermlnals4and5(gnd.)andremov

46、eanyconnection betweentermlnals3and4. 10.Withtheexceptionofthefinalcrystaloscillatoradjustment,the instrumentisnowreadyforuse.DonotattempttoadjusttheCRYSTALTUNING -7- controluntiltheinstruTIlenthasbeenconnectedtothepowerlineforacontinuous period:.of24hoursandthePOWERswitchhasbeenonatleastonehour.Fol

47、low theCrystalOscillatorAdjustTIlentProcedurewhenTIlakinganyadjustnlentofthe CRYSTALTUNINGcontrol. DuringnorTIlaloperationoftheinstruTIlenttheFunctionSelectorswitch isleftintheUSEposition. CrystalOscillatorAdjustnlentProcedure TheCRYSTALTUNINGcontrolshouldnotbeadjustedwithoutconsulting anapprovedTIl

48、onitoringservice.NoadJustTIlentsshouldbeatteTIlpteduntilthe unithasbeenconnectedtothepowerline(crystalovenoperating)foracontinuous periodof24hoursandthecOTIlpleteinstruTIlentturnedonforatleastonehour. ThebestTIlethodofadjustingtheCRYSTALTUNINGcontrolrequires telephonecontactwiththestandardTIlonitori

49、ngservice.AdjusttheCRYSTAL TUNINGcontroluntiltheVISUALCARRIERDEVIATIONTIletercorresponds exactlywiththereportgivenbytheTIlonitoringservice.TheAURALCARRIER DEVIATIONTIletershouldthenagreeverycloselywiththereportoftheTIlonitoring service. AsecondaryTIlethodofcorrectingthefrequencyTIlonitorisusedwhen directcontactwiththeTIlonitoringserVlceislTIlpracticaLWhentheTIlonitoring servicereportisreceived.checkthetransTIlitterlogforthedayandtiTIlethe TIleasureTIlentwasTIlade.IftheTIlonitoringservicereportindicatesthevisual tranSTIlitterwas