HP-203A-Manual-sn425 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: Louis Taber RadioFans.CN 收音机爱 好者资料库 HEWLETT-PACKARDCOMPANY 203A VARIABLEPHASE FUNCTION GENERATOR RadioFans.CN 收音机爱 好者资料库 .t .,. .=-r ,; If- o; ,: CERTIFICATION ie, f.

2、If. ( THEHEWLETT-PACKARDCOMPANYCERTIFIES THATTHISINSTRUMENTWASTHOROUGHLY TESTEDANDINSPECTEDANDFOUNDTO MEETITSPUBLISHEDSPECIFICATIONSWHEN ITWASSHIPPEDFROMTHEFACTORY. FURTHERCERTIFIESTHATITSCALIBRATION MEASUREMENTSARETRACEABLETOTHE NATIONALBUREAUOFSTANDARDSTOTHE EXTENTALLOWEDBYTHEBUREAUSCALI- BRATIONF

3、ACILITY. , RadioFans.CN 收音机爱 好者资料库 OPERATINGANDSERVICINGMANUAL MODEL203A SERIALSPREFIXED:425 VARIABLEPHASE FUNCTIONGENERATOR ( 01760-1 CopyrightHewlett-PackardCompany1964 Printed:JULY1964 .-.iiiiiiillllilliilllilillllllllilililllliill_ Mode1203A SECTIONIGENERALINFORMATION SECTIONIIINSTALLATION SECTI

4、ONIIIOPERATINGINFORMATION SECTIONIVPRINCIPLESOFOPERATION SECTIONVMAINTENANCE SECTIONVIREPLACEABLE PARTS Index ? 01760-1 iii TableofContents Model203A ListofTables TABLEOFCONTENTS Section PageSection Page IGENERALINFORMATION. 1-1 4-40.VariablePhaseChannelModulator. 4-3 1-1.Description. 1-1 4-42.DCAmp

5、lifierAssembliesA6atleast40 dbcon- tinuouslyvariableattenuationonalloutputs. DISTORTION Totalharmonicdistortionhumandnoise64db belowfundamental. OUTPUTWAVEFORMS Availablesimultaneously.Alloutputshave chassisterminalcommon. FREQUENCYSTABILITY Within1%includingwarmupdriftandlinevoltage variationsof10%

6、(typicalshortterm1partin 104) MAXIMUMOUTPUTVOLTAGE Atleast30voltspeak-to-peakopencircuitfor sinusoidalandsquarewaveforms. REFERENCEPHASE SineWave SquareWave VARIABLEPHASE SineWave SquareWave Continuouslyvariable Phasedialaccuracy 0-30voltspeak-to-peak 0-30voltspeak-to-peak 0-30voltspeak-to-peak 0-30

7、voltspeak-to-peak 0-3600 5sinewave 100squarewave OUTPUTSYSTEM Directcoupledoutputisisolatedfromgroundand maybeoperatedfloatingorwitheitherside ground. AMPLITUDESTABILITY 1%referencedto1kc TEMPERATURESTABILITY O.03%perdegreecentigradeat1kc SQUARE WAVERESPONSE RiseandFallTime:operat8dwheretheambient t

8、emperatureexceeds55C (140F). 01760-1 2-11.TheModel203Aisinitiallyshippedasabench typeinstrument(unlessorderedspecificallyasa racktype) withplasticfeetandatiltstandinplace. Conversiontoarack-mountedinstrumentcanbe accomplishedbyusingtherackmountingkitand instructionsfurnishedwithyourinstrument. 2-12.

9、REPACKAGINGFORSHIPMENT. 2-13.ThefollOWingisageneralguideforrepacking aninstrumentforshipment.Ifyouhaveanyquestions, contactyourlocal0jJSalesandServiceOffice(see mapsinAppendixforlocation). a.Placeinstrumentinoriginalcontainerifitis available.Iforiginalcontainerisnotavailable,it canbepurchasedfromyou

10、rnearest0jJSalesand ServiceOffice. Iforiginalcontainerisnotused, b.Wrapinstrumentinheavypaperorplastic beforeplacinginaninnercontainer. c.Useplentyofpackingmaterialaroundallsides ofinstrumentandprotectpanelfacewithcardboard strips. d.Placeinstrumentandinnercontainerinaheavy cartonorwoodenboxandsealw

11、ithstrongtapeor metalbands. e.MarkshippingcontainerwithDelicateInstru- ment,Fragileetc. Note IfinstrumentistobeshippedtoHewlett- Packardforserviceorrepair,attachto theinstrumentatagidentifyingtheowner andindicatetheserviceorrepairtobe accomplished;Includethemodelnumber andfullserialnumberofinstrumen

12、t.In anycorrespondence,identifytheinstru- mentbymodelnumberandserialnumber prefix. 2-1 h_ Model203A 3-1.INTRODUCTION. SectionIII Paragraphs3-1to3-10 SECTIONIII OPERATION 3-7.CALIBRATIONFOR60CYCLE LINEFREQUENCY. 3-2.TheModel203Ageneratestwosinewaveand twosquarewavesignalswhichareavailablesimul- taneo

13、uslyatthefrontpanelOUTPUTconnectors.The outputsignalfrequencyisdeterminedbytheposition oftheFREQUENCYdialandFREQUENCYMULTI- PLIERswitch.BytheuseofthePHASELAGcon- trol,thephaseoftheVARIABLEPHASEOUTPUT signals(onesinewaveandonesquarewave)canbe continuouslyadjustedfrom00to3600withrespectto theREFERENCE

14、PHASEOUTPUTsignals.TheOUT- PUTterminalsprovideanopen-circuitsignallevelof 30voltspeak-to-peak.TheindividualAMPLITUDE controlsprovide40 db ofattenuationforeachoutput signal.TheCALADJcontrolprovidesameansof calibratingtheFREQUENCYdialwiththelinefre- quency. 3-3.CONTROLSANDINDICATORS. 3-4.Figure3-1desc

15、ribesthefunctionofallfront panelcontrols,connectors,andindicators.Thedes- criptionofeachcomponentiskeyedtoadrawingwhich isincludedwithinthefigure. 3-5.OPERATINGINSTRUCTIONS. 3-6.Figure3-2containsoperatingprocedureskeyed to adrawingincludedinthefigure.Refertofigure 3-1forthefunctionofeachcontrolandpa

16、ragraph2-3 forsettingthelinevoltageswitch. 01760-1 3-8.BeforeusingtheModel203A,calibratethe FREQUENCYdialwiththelinefrequencyasfollows: a.Performsteps1and2 offigure3-2. b.AdjusttheCALADJcontrolforminimum flickerrateoftheLINEswitchpilotlamp. Note WhentheFREQUENCYMULTIPLIER switchisintheCALposition,th

17、ereis nooutputsignalattheREFERENCE PHASEOUTPUTconnector. 3-9.CALIBRATIONFORLINEFREQUENCIES OTHERTHAN60CYCLES. 3-10.Forlinefrequenciesotherthan60cpsthe FREQUENCYdialissetto1/10ofthelinefrequency (40to400cpslinefrequency).Againthecalibration ismadewiththefrontpanelCALADJcontrol,which isadjustedforamin

18、imumflickerrateofthepilot lamp.Forlinefrequenciesabove600cpstheFRE- QUENCYdialissetto1/30ofthelinefrequency (33.3fora 1000cpslinefrequency).Atthehigher linefrequenciestheflickerintensitydecreasesand theCALADJcontrolsensitivityincreases. 3-1 D_ SectionIII Figure3-1 1.PushON/OFFpowerswitch. 2.Pilotlig

19、htandcalibrationindicator. 3.ACfuse,1ampere. 4.FREQUENCYselectordial,indicatescps timestheFREQUENCYMULTIPLIERswitch setting. 5.Vernier,providesfinefrequencyadjustment. 6.FREQUENCYMULTIPLIER,selectsfrequency rangeandintheCALpositionsetsupthe203Afor frequencydialcalibration(seeparagraph3-7). 7.CALADJ,

20、adjustfrequencydialcalibration (seeparagraph3-7). 8.REFERENCEPHASEchannelsinewave AMPLITUDEcontrol,providescontinuousadjust- ableattenuationofupto40 db. 9.REFERENCEPHASEchannelsinewaveoutput terminals,provideanominal30voltspeak-to-peak froma 600ohmsourceimpedance. 10.EarthGround. Model203A 2.03A FCC

21、CTlOH GENERATOR .-rT*_ 203A-S-8A 11.REFERENCEPHASEchannelsquarewave AMPLITUDEcontrol,providescontinuously adjustableattenuationofupto40 db. 12.REFERENCEPHASEchannelsquarewave outputterminals,provideanominal30voltspeak- to-peakfroma 600ohmsourceimpedance. 13.PHASELAGcontrol,grovidescontinuously adjus

22、tablephaselagfrom0through3600ofthe variablephasechannelwithrespecttotherefer- encephasechannel. 14.VARIABLEPHASEchannelsinewave AMPLITUDEcontrol,providescontinuously adjustableattenuationofupto40 db. 15.VARIABLEPHASEchannelsinewaveout- putterminals,provideanominal30voltspeak- to-peakfroma 600ohmsour

23、ceimpedance. 16.VARIABLEPHASEchannelsquarewave AMPLITUDEcontrol,providescontinuously adjustableattenuationofupto40 db. 17.VARIABLEPHASEchannelsquarewave outputterminals,provideanominal30voltspeak- to-peakfroma 600ohmsourceimpedance. , 3-2 Figure3-1.FrontPanelDescription 01760-1 , Model203A SectionII

24、I Figure3-2 , 1.PushLINEswitchON,pilotlampglows. 2.SetFREQUENCYdialandMULTIPLIERswitch toCALposition.Refertoparagraph3-7forcali- brationprocedure. 3.SetFREQUENCYdialandMULTIPLIER switchtodesiredoutputfrequency.Usevernier controlonFREQUENCYdialforfinefrequency adjustments. 4.Selectthedesiredtestsigna

25、l(s)andconnect loadtoOUTPUTconnector(s). 5.SetAMPLITUDEcontrol(s)fordesiredsignal level. 6.SetPHASE LAGcontrolfordesireddegreeof phaselagoftheVARIABLE PHASEtestsignal(s) withrespecttotheREFERENCEPHASEtest signal(s). 01760-1 Figure3-2.OperatingInstructions 3-3 l o lTj(J). .(!) :l 1-1 1 I Model203A SE

26、CTIONIV PRINCIPLESOFOPERATION SectionIV Paragraphs4-1to4-19 7 (f 4-1.OVERALLDESCRIPTION. 4-2.ThissectiondescribeshowtheModel203A VariablePhaseFunctionGeneratoroperates.The blockdiagram,figure4-1,showsthemainsections andthesignalflowwithintheModel203A. 4-3.TheModel203Aisabeat-frequencyoscillator w.hi

27、ch,bymixingtwohigh-frequencysignals,generates sIgnalsinthefrequencyrangeof0.005cpsto60kc (refertoparagraph1-5foroptions).One ofthehigh- frequencyisgnalsisafixedfrequency;theotheris variable.TheModel203Ahastwosignalchannels, REFERENCEPHASEandVARIABLEPHASEeach of whichproducesasine-wavesignalandasqare

28、 wavesignal.Thetwochannelsareelectricallysimi- larexceptthattheVARIABLE PHASEchannelcon- tainsacontinuouslyadjustablephase-shiftingcircuit whichchangesthephaserelationshipoftheVARI- ABLE PHASEOUTPUTwithrespecttotheREFER- ENCE PHASEOUTPUT.Thefoursignals(twore- ferencephaseandtwovariablephase)areavail

29、able simultaneouslyattheOUTPUTconnectors. 4-4.Thefixedfrequencysignal,whichisgenerated byacrystalosctllator,isappliedtobothchannelsand routedtoamodulatorthroughaRFAmplifierwithin eachchannel.ThevariablefrequencysIgnalisapplied directlytothemodulatorofeachchannel.Thefre- quencyofthevariablefrequencys

30、ignaliscontrolled bythepositionoftheFREQUENCYdialandthesetting oftheFREQUENCYMULTIPLIERswitch.Thesetwo signalsaremixedinthemodulatorandthedifference infrequencybetweenthetwosignalsistheoutput frequencyoftheModel203A. 4-5.CRYSTALOSCILLATORANDDIVIDER ASSEMBLY(Al). 4-6.AssemblyAlconsistsof acrystalcont

31、rolled oscillatoranda 9:1frequencydivider.Refertothe schematicdiagram,figure5-10,forcircuitdetails. 4-7.CRYSTAL OSCILLATOR. 4-8.Theoscillator(A1Y1andA1Q1)isacrystal controlledgroundedbaseColpittsoscillator.The outputisappliedthroughbufferamplifierA1Q1,for isolation,tothebaseofthe9:1frequencydivider.

32、 4-9.9:1 FREQUENCY DIVIDER. 4-10.The9:1dividerconsistsof adividerA1Q3and atankcircuitwhichconsistsofA1C8, A1C9,A1Cll, andA1L2.ThedividerisbasicallyaclassCgrounded baseColpittsoscillator. 4-11.Twothingsoccurduringeachcycleofthedivi- deroperation.Oneisamplitudemodulationofthe signalappliedtothebaseof

33、A1Q3,andthesecondisa mixingactionwithinA1Q3.Eachfunctionoccursat 01760-1 adifferenttimeduringeachcycleofoscillationand togethertendtosynchronizeA1Q3 with asub-multiple frequencyofthefrequencyappliedtothebaseofthe divider. 4-12.DividerA1Q3operatesintheregionofvoltage saturationforaportionofeachcycle.

34、Duringthe saturationperiod,theimpedancebetweenthebaseand collectorof A1Q3becomesverylow;fortherestof cycletheimpedancebetweenthebaseandcollectoris relativelyhigh.Thevariationinimpedancebetween baseandcollectorof A1Q3resultsinamplitudemod- ulation(about10%)ofthesignalonthebaseofthe divider.Thisamplit

35、udemodulationcreatessidebands atthe8thand10thharmonicofthedivideroscillating frequency. 4-13.Thesignalappliedtothebaseof A1Q3is 4.995Mc whichisgeneratedbythecrystaloscillator circuit.Thetankcircuitof the 9:1divideristuned sothatA1Q3isoscillatingatthe9thsub-multiple frequencyof4.995Mc (555 kc). 4-14.

36、ThemixingprocesswithinA1Q3occursatthe timeduringeachcyclewhenthedividerjuststartsto conduct.Duringthisshorttime,the8thand10th harmonicofthe555kcsignalaremixedwiththe9th harmonicresultinginafrequencycomponentat555kc whichinfluencestheoscillationsof A1Q3.Theresult isthatA1Q3stayssynchronizedtothe9thsu

37、b-har- monicof4.995Mc. 4-15.Thepitypetankcircuitfiltersoutharmonic frequencieswhichmaybepresentatthecollectorof A1Q3.AbufferamplifierA1Q4providesfurther filtering,isolation,andpowergain.Theoutput of the9:1dividerisa 555 kcsignalandiscoupledby A1T2toA2Q1andA2Q2(seefigures5-10and5-12). 4-16.VARIABLEPH

38、ASESHIFTERASSEMBLY. 4-17.ThevariablephaseshifterassemblyA25 (figure5-12)isagoniometerconsistingoftwostator windings, arotorwinding,andassociatedcircuits. Thegoniometerrequirestwo 555kcinputsignals;one fromA2Q2 to oneoftestatorwindings,andtheother fromA2Q1andthe90phaseshiftnetworktotheother statorwin

39、ding.Theoutputphasecorrespondstothe angleoftherotorwinding (PHASE LAGcontrol).The phaeanbecontinuouslyadjustedfrom00through 360wIthrespecttothereferencesignalwhile maintainingaconstantamplitude.Theadjustable phaseshifteroutputisappliedtotheRFamplifier assemblyA2(figure5-12). 4-18.RFAMPLIFIERS(A2). 4

40、-19.TheRFamplifierassemblyA2consistsof twoRFamplifiers;A2Q3,A2Q4,andA2Q5forthe referencephasechannelandA2Q6throughA2Q9for 4-1 -. SectionIV Paragraphs4-20to4-30 thevariablephasechannel.Refertotheschematic diagram(figure5-12)forcircuitdetails. 4-20.VARIABLE PHASE CHANNELRF AMPLIFIER, 4-21.Thesignalfro

41、mthevariablephaseshifter isamplifiedbyA2Q6,thenappliedtothebaseof A2Q7 . A2Q7andA2Q8actasanover-drivenamplifierwhich amplifiesandclipsthesignalappliedtothebaseof A2Q7;thisoperationproducesasquarewaveofcur- rentatthecollectorof A2Q8.Thezerocrossingof thesquarewave ofcurrentcoincideswiththezero crossi

42、ngofthesinewavesignalappliedtothebaseof A2Q7sothatthephaseoftheappliedsignalispre- served.Atunednetwork,formedbyA2C24,A2C25, A2C29,A2C30, A2L7,andA2T2filtersthe555kc square-currentwaveformtoanearlypuresinewave. 4-22.TheoutputoftheRFamplifiercircuit,which istakenacrossA2C30,ismaintainedataconstant am

43、plitudebythelevelcontrollingcircuit.Iftheout- putshouldincrease,thevoltageatA2C27increases, resultinginavoltageincreaseatthebaseof A2Q9. Thisincreaseisappliedtothebasesof A2Q7and A2Q8whichthenconductlessaveragecurrent.When A2Q8conductsless,thesignalatitscollectorde- decreasesandtheoutputvoltagedecre

44、asesppposing theoriginalchange.Theresultisthattheamplitude oftheoutputremainsnearlyconstantdespitevari- ationsintheamplitudeoftheinputsignal.Theout- putsignalisthenappliedtoA3T3inthemodulator assemblyA3(figure5-16). 4-23.REFERENCEPHASE CHANNELRF AMPLIFIER, 4-24.Thesignalpresentattheemitterof A2Q2is

45、appliedtothereferencephasechannelRFamplifier section,A2Q3throughA2Q5.Thisstageoperates FROM VFO . Mode1203A thesameasthevariablephasechannelRFamplifier describedinparagraph4-20.Theoutputsignalis thenappliedtoA2T4inthemodulatorassemblyA3 (figure5-16). 4-25.VARIABLEFREQUENCY OSCILLATOR(A10). 4-26.Thev

46、ariablefrequencyoscillatorassembly Al0generatesasignalthatisvariablefrom495kcto 550kcbyrotationofthefrontpanelFREQUENCYdial. TheFREQUENCYdialiscalibratedsothatwiththe dialsetat5theVFOisoscillatingat550kcandwith thedialsetat60theVFOisoscillatingat495kc.The outputsignalfromthevariablefrequencyoscillat

47、oris appliedtothe1 KpositionoftheMULTIPLIER(fre- quencyrange)switchandalsotothe1stdecademodule. Refertotheschematicdiagram,figure5-14,for circuitdetails. 4-27.DECADEMODULES(All-A16). 4-28.ThesixdecademoduleassembliesAllthru A16eachconsistof amixer,abandpassfilter,anda 10:1divider.Thesedecadesproduce

48、abandofhigh frequencysignalsthataremixedinthemodulators(A3) withthe555kcfixedfrequencysignalfromtheRF amplifierstoproduceasignalinthe0.005cpsto60 kcrange(refertoparagraph1-5foroptions).Refer totheschematicdiagram,figure5-14andfigure4-2 forcircuitdetails. 4-29.DECADE MODULE(All). 4-30.The4.995Mcsigna

49、lfromthecrystaloscillator isappliedtotheemitterofAllQlisolationstage,and subsequentlyappearsacrosstheprimaryofAllTl.The signalfromAllTlisappliedtoasuppressedcarrier, balancedmodulator.The495 kcVFOsignal(assume 4.995MC TOIK POSITIONOF * MULTIPLIER SWITCH 495KC All1STDECs.MODULE 1:- - -l I BPFILTER 10:1 I I MIXER (5.4-5.6MClt-.-+I549KC C910,) DIVIDER QIe.TI Q3 T2 5.490MC II I - , SIB TO100POSITIONOF MULTIPLIERSWITCHSIB TOMIXERIN2ND THROUGH 6TH DECADEMODULES*THE INSTRUMENTCONTAINS SIXDECADEMODULES. ALLAREIDENTICAL AND IN