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Operating Manual B+K PRECISION 4051 Multi-Function Generator 22820 Savi Ranch Parkway, Yorba Linda, CA 92887 U.S.A. Phone: 714.921.9095, Fax: 714.921.6422 Web: www.bkprecision.com
OperatingManual
B+KPRECISION4051
Multi-FunctionGenerator
22820SaviRanchParkway,YorbaLinda,CA92887U.S.A.Phone:714.921.9095,Fax:714.921.6422Web:www.bkprecision.com
LimitedOneYearWarrantyB+KPrecisionwarrantstotheoriginalpurchaserthatitsproductandthecomponentpartsthereof,willbefreefromdefectsinworkmanshipandmaterialforaperiodofoneyearfromthedateofpurchase.
B+KPrecisionwill,withoutcharge,repairorreplace,atitsoption,defectiveproductorcomponentparts.Returnedproductmustbefreightprepaidandaccompaniedbyproofofthepurchasedateintheformasalesreceipt.
ToobtainwarrantycoverageintheU.S.A.,thisproductmustberegisteredbycompletingandmailingtheenclosedwarrantycardtoB+KPrecision,22820SaviRanchParkway,YorbaLinda,CA92887U.S.A.withinfifteen(15)daysfromproofofpurchase.
Exclusion:Thiswarrantydoesnotapplyintheeventofmisuseorabuseoftheproductorasaresultofunauthorizedalternationsorrepairs.Itisvoidiftheserialnumberisalternated,defacedorremoved.
B+KPrecisionshallnotbeliableforanyconsequentialdamages,includingwithoutlimitationdamagesresultingfromlossofuse.Somestatesdonotallowlimitationofincidentalorconsequentialdamages,sotheabovelimitationorexclusionmaynotapplytoyou.
Thiswarrantygivesyouspecificrightsandyoumayhaveotherrights,whichvaryfromstate-to-state.
ModelNumber:______________________DatePurchased:_____________________
PurchaseAgent:______________________
Owner:_____________________________
MODEL4051
Multi-FunctionGenerator
OperatingManual
IMPORTANT:Theinformationinthisdocumentissubjecttochangewithoutnotice.B+KPrecisionCorporationassumesnoresponsibilityforanyerrorwhichmayappearinthisdocument.
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BKPRECISIONMODEL4051OperatingManualTableofContents
Warranty:InsideFrontCover
SectionOne:GENERALINFORMATION
1.1-INTRODUCTION1.2-FEATURES1.3-UNPACKINGANDINSPECTION1.4-INSTRUMENTIDENTIFICATION1.5-INSTRUMENTPOWERANDCARE
SectionTwo:FUNCTIONS
2.1-INTRODUCTION2.2-FUNCTIONKEYSWITCH2.2.1-“CAL”KEY2.2.2-“SOURCE”KEY2.2.3-“SWEEP”KEY2.2.4-“BURST”KEY2.2.5-“MOD”KEY2.2.6-“SET”KEY2.2.7-“RNGUP”KEY2.2.8-“RNGDN”KEY2.2.9-“WAVEFORM”KEY2.2.10-“SYM”KEY2.2.11-“OFFSET”KEY2.2.12-“LOGIC”KEY
2.2.13-“ADJUST”KEY2.2.14-“FUNCTION”KEY2.3-CONTROLKNOB2.3.1-DIGITALENCODER2.3.2-AMPLITUDEPOT2.4-BNCOUTPUTANDINPUTJACK2.4.1-50OHMOUTPUT2.4.2-TTL/CMOSOUTPUT2.4.3-EXT.COUNTERINPUT2.4.4-VCG/MODINPUT2.4.5-BURSTINPUT2.5-LOGIC/DVMPROBEJACK2.6-TRIPLEOUTPUTDCPOWERSUPPLYJACK2.6.1-+VsJACK2.6.2--VsJACK2.6.3-+5V/3.3V(VCC)JACK2.6.4-GNDJACK2.7-RESETSWITCH2.8-POWERON/OFFSWITCH2.9-LCD2.10-RS-232CSERIALPORT2.11-VCGOUTPUT2.12-HEATACTIVATEDCOOLINGFAN
SectionThree:OPERATION
3.1-THEORYOFOPERATION3.2-BASICFUNCTIONGENERATOROPERATION3.2.1-COARSEFREQUENCYADJUSTMENT3.2.2-FINEFREQUENCYADJUSTMENT3.2.3-FREQUENCYLOCKING3.2.4-RANGINGSELECTION3.2.5-WAVEFORMSELECTION
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3.2.6-DUTYCYCLE(SYMMETRY)CONTROL3.2.7-DCOFFSETCONTROL3.2.8-OUTPUTLEVELAMPLITUDECONTROL3.3-SWEEPOPERATION3.4-BURSTOPERATION3.5-MODULATIONOPERATION3.6-MULTIPLEFUNCTIONOPERATION3.6.1-AUTORANGINGFREQUENCY(EXT.CNTR)
COUNTEROPERATION3.6.2-LOWFREQUENCYCOUNTEROPERATION3.6.3-TOTALIZECOUNTER(TOTAL)OPERATION3.6.4-DIGITALVOLTMETER(DVM)OPERATION3.6.5-CMOSLOGICOUTPUTLEVEL(C-LEVEL)
ADJUSTMENT3.6.6-POSITIVEPOWERSUPPLY(+Vs)ADJUSTMENT3.6.7-NEGATIVEPOWERSUPPLY(-Vs)ADJUSTMENT3.6.8-LOGICPOWERSUPPLY(Vcc)CONTROL3.7-TTL/CMOSLOGICCONTROLOPERATION3.8-PROGRAMMEMORYOPERATION3.8.1-PROGRAMMEMORYSTORAGEOPERATION3.8.2-PROGRAMMEMORYRETRIEVAL3.9-COMPUTERREMOTECONTROLOPERATION3.10-RESTOREFACTORYDEFAULTSETTINGS3.11-INPUTANDOUTPUTPROTECTION3.11.1-BNCOUTPUTJACK3.11.2-BNCINPUTJACK3.11.3-LOGIC/DVMPROBEINPUT3.11.4-POWERSUPPLY3.12-ONE-STEPOUTPUTAMPLITUDECONTROL3.13-LOGICPROBEOPERATION3.14-LIMITATIONSOFTHENEGATIVEPOWERSUPPLY
SectionFour:OPERATINGSTEPS&TROUBLESHOOTING
4.1-INTRODUCTION4.2-BASICFUNCTIONGENERATORMODE4.3-FREQUENCYSWEEPINGOPERATION4.4-OUTPUTSIGNALBURSTOPERATION4.5-OUTPUTSIGNALMODULATIONOPERATION4.6-FREQUENCYCOUNTER,LOWFREQUENCY
COUNTER,ANDTOTALIZECOUNTEROPERATION4.7-MULTI-FUNCTIONSIMULTANEOUSOPERATION4.8-POSITIVEANDNEGATIVE(+Vs&-Vs)POWER
SUPPLYADJUSTMENT4.9-CMOSOUTPUTLEVEL(C-LEVEL)ANDADJUSTMENT4.10-PROGRAMMEMORYOPERATION4.11-RS-232CCOMPUTERINTERFACEEXAMPLE4.12-TROUBLESHOOTINGGUIDE
SectionFive:SPECIFICATIONS
SectionSix:PANELDIAGRAMS
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NOT E S
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NOT E S
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GENERALINFORMATION
SECTIONONE:GENERALINFO
1.1 INTRODUCTION
TheMODEL4051programmablemultifunctiongeneratorisanexceptionallyversatileandeconomicalinstrumentforapplicationsinR&D,ManufacturingTests,ServiceRepair,andTraining.Featuringanadjustabletripleoutputpowersupplyandwaveformgenerator,ithastheabilitytoprovidepowerandsignalsourcesforacircuitwhiletheuniversallogicprobe,auto-rangingfrequencycounter,anddigitalvoltmeterallowuserstosimultaneouslyanalyzeandmeasurecircuitactivity.Thiscompactdevicecombinesthefunctionalityoffivestandardlaboratoryinstrumentsintooneintegratedunit,makingthetaskofswitchinginstrumentsaseasyaspressingabutton.
1.2 FEATURES:
• Autorangingfrequencyandlowfrequencycountercoversthemeasurementrangefrom0.04Hzto35MHzwithfixedTTL/CMOSlogicthresholdorvariabletriggeringlevel.
• Totalizecountercountsupto999999counts.
• 35MHzuniversallogicprobeforTTLlogicandCMOSlogic(from3Vto16V),displayallthelogicstateswithsixdifferentuniqueformats.
• 4-digitauto-rangingDCVoltmetercoverstherange±0~250V.
• TripleoutputsPowerSupply:
1) 5V/3.3Vlogicsupply,with5Aoutputcurrent.
2) +Vsvariable0to+24V,with1.5Aoutputcurrent.
3) –Vsvariable0to–24V,with1.5Aoutputcurrent.
+Vsand–Vssupplycanbeseparatedordualtrackingadjusted,andeachsupplyhasshortcircuit,overcurrent,andovertemperatureprotection.Digitaldisplaymonitorseachsupplyvoltagewhilethesupplyisbeingadjusted.
• MemoryBackupforprevioussettings,allowingthisunittoworksimilartoaconventionalmechanicalswitchoperatedinstrument.All
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GENERALINFORMATION
previoussettingsareretrievedandthepreviousadjustedquantitydisplaysontheLCDbargraph.Thedigitalencodercanadjustandmemorizeupto18activequantities,allowuserstoswitchbetweenfunctionswithoutlosingalreadymadeadjustments.
• Autofrequencylockingcapability—unlikeconventionalfunctiongenerators,theoutputfrequencyoftheMODEL4051canbeautomaticallylockedwithin±0.2%rangeatthetunedfrequency,withoutdriftcausedbytemperature,moistureorcomponentdegeneration.
• Onetimesetupprogrammemory—providesdatamemorywhichcanstoreuptotendifferentfilesandcanberetrievedwithasinglekeystroke.
• RS232interfaceport—enablesnetworkconnectivitybyacomputertoperformremotemonitoringorcontrolofsensorsoractuatorsincorrectiveoranalysisapplications.
modes,settings,andquantityadjustmentsinusearememorizedandcanberestoredimmediatelyafterpowerup.
• LCDBack-lightdisplay—highbrightness,uniformcoldcathodefluorescentlampback-lightingprovidesahighcontrastdisplayeasilyreadablefrommultipleanglesevenfromadistance.
• Sweepfunctiongeneratorcoveringthefrequencyrangeof0.14Hzto20MHzwithlarge6-digitdisplay,CoarseandFineadjustments,DCoffsetandDutycyclecontrols,WaveformprovidedwithSine,Triangle,Square,Saw-tooth,±Ramp,±Pulse.WithoperatingmodesofNormal,Sweep(linearorlogarithm),Burst(singleormultiple),Modulation(FMorAM),VCG.Outputamplituderangeof20mVto20Vp-p.TTL/CMOSlogicoutput:CMOSoutputlevelcanbeadjustedfrom3.0Vto16.0V.TheTTLsignalcanbeswitchedbetween5Vor3.3Voutput,ithasthesamefrequencyasthemaingenerator.
• Userfriendlykeyswitchoperation—Asfunctionkeysarepressed,correspondingfunctionsand
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GENERALINFORMATION
identifyyearofmanufacturing,thesecondtwodigitsidentifythemonth,andthelastfourdigitsrefertothemanufacturedrunquantity.
1.5INSTRUMENTPOWERANDCARE
TheACpowerisinternallysetfor120Vor220VACbyajumper.Thepowersettingismarkedclearlyonthebackpanel.Besuretocheckthebackpanelbeforeconnectingthelinevoltage.Thelinevoltagemustbewithin±10%ofthesettingvoltage.Linefrequencymustbewithinarangeof46Hzto68Hz.
Theinstrumentshouldnotbeturnedonandoffquicklyandrepeatedlyaslossofdatasavedinsystemmemorymayresult.
Replacementfusesmustbe2Aforthe120VACor1Aforthe220VAC.ThefuseholderisinsidetheACpowerreceptacle.
IftheMODEL4051needscleaning,therubberbootcanbeeasilyremovedforcleaningpurposes.Toreassembletherubberboot,pushthefourrubbertabsbackintotheirholeswithapinorasmallscrewdriver.
1.3UNPACKINGANDINSPECTION
TheMODEL4051multi-tasklabinstrumentwascarefullytestedandinspectedbothmechanicallyaswellaselectronicallypriortoshipment.Uponreceivingtheinstrument,carefullyunpackallitemsfromtheshippingcartonsandinspectthemforanyobvioussignsofphysicaldamagethatmayhaveoccurredduringdelivery.Reportanysuchdamagetotransitagentimmediately.Saveboththepackingboxandfoamblocksforfutureuseincasere-shipmentisrequired.Afterunpackingthesystem,checkforthefollowingincludeditems.
• Oneprogrammablemultifunctiongenerator
• Onelogicprobe
• OneBNCcable
• OnePowerCord
• OneOperatingManual
1.4INSTRUMENTIDENTIFICATION
EachBKPrecisioninstrumenthasaneight-characterserialnumber(e.g.04120015).Thefirsttwodigits
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FUNCTIONS
SECTIONTWO:FUNCTIONS
1.1INTRODUCTION
Push-buttonkeyswitchesaccessallfunctionsoftheMODEL4051.Keysmaybededicatedormultiplexedwithmultiplefunctionassignments.Asafunctionkeyispressed,arelatedfunctionstatusmessageisshownontheLCDdisplay.Thedigitalencodercanadjustandmemorizetheactivequantityofeachaccessedfunction,allowingtheusertoswitchbetweenfunctionswithoutlosingalreadymadeadjustments.OutputandInputconnectionstotheMODEL4051areprovidedthroughBNCjacks.Fourbananajacksareavailableforusewiththetripleoutputpowersupply.
Note:BKPrecisionalsoofferstheMODEL4050,aspeciallyconfiguredMODEL4051withoutatripleoutputpowersupply.
2.2FUNCTIONKEYSWITCH
TherearefourteenkeyswitchesaroundtheLCDdisplay.Eachkeycapisprintedwiththenameofadedicatedfunctionorageneralcontrolname.Whenafunctionkeyispressed,on-screenmessagesappeartoindicatetheactiveoperation.
FunctionKeyButtons:CAL,SOURCE,SWEEP,BURST,MOD,SET,RNGUP,RNGDN,WAVEFORM,SYM,OFFSET,LOGIC,FUNCTION,ADJUST.
2.2.1“CAL”KEY
WhiletheMODEL4051issetinfunctiongeneratormode,theCALkeycanresetthe50OHMoutputsignalto50%dutyandtheDCoffsettozero.OperatinginthePositive(+VS)orNegative(-VS)powersupplyadjustmentmode,thiskeyenablesorinhibitsthe“Tracking”adjustmentmodeforbothpowersupplies.The“CAL”keyalsorestoressavedsettingsfromprogrammemory.
2.2.2 “SOURCE”KEY
ThecontrolsignalforSweep,Burst,andModulationoperationsofthefunctiongeneratorcanbeselectedeitherfromanInternal(INT)orExternal(EXT)source.TheSOURCEkeytogglesbetweensourcesforthecontrolsignalwhenpressed.Bydefault,functionsaresetto(INT)mode.TheSourcekeyalsoservesastheentrykeytoProgrammemory,eitherformemorystorageormemoryrecalloperations.InSINGLEBURSTmode,theSOURCEkeyisusedtofireasinglepulsemanuallywhenTIMEissettothemaximumquantity.
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2.2.3.“SWEEP”KEY
ThefrequencysweepingfunctioncanbeselectedeitherinLinear(LIN)orLogarithm(LOG)mode.PressingtheSWEEPkeycantogglebetweenthesetwooperations.BydefaulttheSweepfunctionissettoLINmode.
2.2.4“BURST”KEY
Theoutputsignalfromthe50OHMBNCJackcanbecontrolledasasingle(SINGLEPULSE)Burstoramultiple(MULTP)Burstofapulsetrain.Pressingthiskeycantogglebetweenthesetwotypesofoperations.BydefaulttheBurstfunctionissettoSINGLEmode.
2.2.5“MOD”KEY
Themaingeneratoroutputcanbemodulatedbyaninternalsignal(astandard1KHzsinewave)oranexternalsignalfromtheVCG/MODBNCJack.Pressingthiskeyselectsbetweenfrequencymodulation(FM)orAmplitudemodulation(AM).Bydefault,themodulationfunctionissettoFM.
2.2.6“SET”KEY
Undernormaloperation,theSETkeyturnsthebacklightoftheLCDdisplayonoroff.WhenthefunctiongeneratorissettoperformaSweep,Burst,orModulationoperation,thiskeyallowstheusertostrobeeachstepandadjustquantityduringsetup.Thiskeyalsoallowstheusertostorecurrentsettingstoprogrammemory.
2.2.7“RNGUP”KEY
Pressingthiskeycanincreasetheoutputfrequencybyadecadeuntiltherangereaches20MHz.Thecurrentrangeisdisplayedbythesideofthiskeyinatotalofeightdifferentranges.
2.2.8“RNGDN”KEY
Pressingthiskeycandecreasethefrequencyrangebyadecade,untiltherangereaches2Hz.
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2.2.9“WAVEFORM”KEY
SelectsthewaveformoftheoutputsignalSine,Square,orTrianglewaveform.Thedisplayedwaveformbythesideofthiskeyisthecurrentoutputwaveform.
2.2.10“SYM”KEY
Thiskeyenablesthedutycyclefunction,whichadjuststhesymmetryofthemainoutputsignalandTTL/CMOSsignal.Thearrowsignsonthedisplay(or)indicatestheadjusteddirection.Forasignalwithadutycycleotherthan50%,oneofthearrowswillbedisplayedconstantly.
2.2.11“OFFSET”KEY
ThiskeyenablesDCoffsetadjustmentofthemainoutputsignal.Thepositiveandnegative(+),(-)signsonthedisplayindicatesthedirectionoftheDCoffset.Aslongasanoffsetexists,asignwillbedisplayed.Secondaryfunction:Inmultifunctionsequencemode,thiskeyservesasthebackwardkey.
2.2.12“LOGIC”KEY
SelectsthelogicsignalforTTL5V,TTL3.3VorCMOSLogicattheTTL/CMOSoutputJack,thelogicthresholdlevelsofthelogicprobe,thetriggeringlevelsofthecounters,andthelogicpowersupply(Vcc)outputs.
2.2.13“ADJUST”KEY
Pressingthiskeyatanytimewillabortotherfunctionsandenterintofunctiongeneratorcoarsefrequencyadjustmentmode.Thiskeycanthentogglebetweencoarseandfinefrequencyadjustments.Thetypeofquantitybeingadjustedisindicatedbytheblinkingsigndisplayedabovethe“ADJUST”key.
2.2.14“FUNCTION”KEY
Controlsfunctionsanddisplaysforoperationsoutsideofthefunctiongenerator.Presstostartthemultifunctionsequencemode.Uponenteringthismultifunctionsequence,eachadditionalpressofthe“FUNCTION”keyadvancesforwardonestepinthesequence,the“OFFSET”keystepsbackward,andthe“ADJUST”keyabortsthesequence.
oror
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FUNCTIONS
OntheMODEL4051,thefunctionsequenceadvancesinthefollowingorder:
Note:OnthespeciallyconfiguredMODEL4050unit,thesequenceloopstothebeginningaftertheCMOSLevelfunctionsinceitlackstheMODEL4051’stripleoutputpowersupply.
2.3CONTROLKNOB
Therearetwocontrolknobsonthefrontpanel,oneisdedicatedtothesignaloutputlevelcontrol,andtheotherismultiplexedforallotheradjustments.
2.3.1DIGITALENCODER
Thedigitalencodercanadjustandmemorizeupto18activequantities,allowinguserstoswitchbetweenfunctionswithoutlosingalreadymadeadjustments.TheactiveitembeingadjustedbytheencoderwillblinkontheLCD.Thefullrangeofeachadjustablequantitycorrespondstothetwelvesectionsofthebargraph.
2.3.2AMPLITUDEPOT
Controlstheamplitudeofthesignalattheoutputjackwith20Vp-pintotheopencircuit,10Vp-pintothe50OHM.Attenuationfactorscanbeatotalof–40dBfromthemaximum.
2.4BNCOUTPUTANDINPUTJACKS
TherearefiveBNCjackslocatedontherightsideofthefrontpanel,twoforoutputsignalsandthreeforinputsignals.
•2.4.150OHMMAINOUTPUTUsedformainfunctiongeneratoroutputwithsuperimposedDCoffsetandDutycycleadjustment.
•2.4.2TTL/CMOSOUTPUTProvidesTTL5V,TTL3.3VorCMOSsquarewaves.Whentheselectedoutputwaveformisthesquarewaveform,ithasthesamefrequencyanddutycycleasthemainoutput,butisindependentofoutputlevelcontrolfromtheAmplitudePotandDCoffsetcontrols.
•2.4.3EXT.COUNTERINPUTUsedformeasuringthefrequency(3Hzto35MHz)ofasmallamplitudesignalorasignalwithDCbias.ThisinputjackacceptsACcouplingonlyandtheinputsignalmustbegreaterthan3Hz.
FunctionGenerator->Freq.Counter(EXTCNTR)->LowFreq.Counter(EXTCNTRTOTAL)->TOTALIZECounter(TOTAL)->DigitalVoltmeter(DVM)->CMOSlevel(C-LEVEL)->PositiveSupply*(+Vs)->NegativeSupply*(-Vs)->LogicSupply*(Vcc)
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•2.4.4VCG/MODINPUTUsedforexternalcontrolsignalinputforSweepormodulationoperationswhentheSOURCEkeyistoggledtoEXT.InSweepoperations,thisjackisusedforVoltageControlGenerator(VCG)Input.Ahigherpositivevoltagewilldecreasethegeneratoroutputfrequency.InModulationoperations,thisjackisusedformodulationinputsource.
•2.4.5BURSTINPUTUsedtoinputanexternalgatingsignalforBurstoperations.TheuserisabletoapplyaTTLlogicsignalwithproperwidththroughthisportwhenconnectedtoanexternal(EXT)source.
2.5LOGIC/DVMPROBEJACK
Usedtoconnectthefurnishedlogicprobeforvoltageandfrequencymeasurement(0.04Hzto35MHz)andlogiccircuitactivityanalysis.
2.6TRIPLEOUTPUTDCPOWERSUPPLYJACK
OntheMODEL4051,atripleoutputpowersupplyisprovidedthroughfourbananasocketslocatedontheleftlowersideofthefrontpanel.OntheMODEL4050specialconfiguration,thereisnotripleoutputpowersupplyandthefourbananasocketsarenotavailable.
2.6.1+VsJACKVariablepositivesupplyoutputfrom0to+24Vwithtypicaloutputcurrent1.5A.
2.6.2-VsJACKVariablenegativesupplyoutputfrom0to–24Vwithtypicaloutputcurrent1.5A.Thenegativesupplycanbeadjustedindependently,ortrackedwith+Vs(positive)supply.
2.6.3+5V/3.3V(VCC)JACKLogicsupplyoutput5Vor3.3Vdependingonselectedmodewithtypicaloutputcurrentof5A.
2.6.4GNDJACK
Groundterminalforpowersupplyandsysteminputs/outputs.
2.7RESETSWITCH
Theresetswitchislocatedthroughapinholeonthefrontpanel.Whenactivated,itresetstheMODEL4051toitsfactorydefaultstate.Youshouldonlyresetyourmachineifanyofthefollowingconditionsoccurs:
• Thevoltageofthegoldencapacitorhasdroppedbelow1.8Vduetotheunitbeinginnon-operationstateforalongperiodoftimeandalldisplayandkeyswitchesarestuckafterthepoweristurnedon.
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•Anypartofthedisplayandkeyswitchesarenotfunctioningnormallyduetostaticchargeorimproperoperation.
•Allprevioussettingsinthememoryfileneedtobeerased.
Toreset,themachine,thepowermustbeturnedon.InsertapapercliporpinthroughtheRESETpin-holeandpushdownuntilthedisplayresets.
2.8POWERON/OFFSWITCH
Thepowerswitchislocatedonthelowerleftcornerofthepanel,witharedLEDasthepowerindicator.
2.9LCD
5”x1.5”LiquidCrystalDisplaywithCCFLbacklight.Inthedisplaycenter,thereisa6-digitindicatorusedtoshow:
• outputsignalforthefunctiongenerator
• incomingsignalforthecounter
• voltagemeasurementdisplaysfortheDigitalVoltmeter(DVM)
• settingsforthetripleoutputDCpowersupply
SystemmessagesaredisplayedaroundthefouredgesoftheLCDnearitscorrespondingfunctionkey.Displayedsystemmessagesidentifythecurrentoperationandsettings.WhenadjustmentsaremadeusingtheDigitalEncoder,blinkingsignsindicatethesettingsbeingaffected.
2.10RS-232CSERIALPORT
ADB9subfemaleconnectorislocatedonthebackpaneltoallowtheusertoconnecttheunittoacomputerfor:
• remotemonitoring
• controlofsensorsoractivatorsincorrectiveoranalyticalapplications
Thisconnectorconnectspin2toTXD,pin3toRXD,pin5toground,andissetat9600bps1stop,8-bitnoparitymode.
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2.11VCGOUTPUT
TheBNCJackonthebackpanelisusedforvoltagecontrolledgeneratoroutput.Theoutputvoltageisproportionaltothegeneratorfrequency.
2.12HEATACTIVATEDCOOLINGFAN
Whentheambienttemperatureinsidetheunitreachesadesignatedlevel,aheatsensingcoolingfanactivates.Fanspeedwillincreaseordecreaseinresponsetotheinsidetemperature.Priortothefancomingon,it’snormaltohearalowwhistlingnoisecomingfromthemachine.(OntheMODEL4050machine,thefanispoweredbyaconstantDCvoltageinsteadofaheatsensingcircuit.)
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SECTIONTHREE:OPERATION
3.1THEORYOFOPERATION
TheMODEL4051programmablemultifunctionGeneratorisaversatilesignalsource,combiningfourcommonlabinstrumentsintoonelowcost,userfriendly,andhighlyportableunit.TheheartofthefunctiongeneratorisaVCG(Voltage-ControlledGenerator)thatproducesprecisionsine,squareortrianglewavesoverthe0.2Hzto20MHzrange.Abuiltinautorangingfrequencycounterdisplaystheoutputfrequencyofthegenerator,orexternalsignalsfromthecounterinputorlogicprobe.
Coarseandfinefrequencytuningcontrolspermitprecisionsettingoftheoutputfrequencywhichisthenlockedwithin±0.2%bytheautofrequencylockingfunctiontoeliminatedriftcausedbytemperature,moistureorcomponentdegeneration.AcontinuouslyvariableDCoffsetallowstheoutputtobeinjecteddirectlyintocircuitsatthecorrectbiaslevel,andthevariabledutycycleoftheoutputsignalconvertstheinstrumenttoapulsegeneratorcapableofgeneratingrectangularwavesorpositiveornegativegoingpulses,
ramporsawtoothwaves,andslewedsinewaves.
Thesweepgeneratorcandigitizestartandstopfrequencieswithvariablesweeptimedisplayedinlinearorlogarithmicmode.Burstoperationenablesthegeneratoroutputtobecontrolledbyaninternalorexternalsignalwithasingleburstormultipleburstsofapulsetrainatavariablewidthandtiming.Theoutputcanalsobeamplitudeorfrequencymodulatedbya1KHzsinewaveinternallyorbyanexternalappliedsignal.
Digitaladjustmentsofactivequantitiesisperformedbythedigitalencoderonupto18differentquantities.Theactiveadjustmentdisplaysonthebargraph,expandingtotherightwithincreasingquantitiesandshrinkingtotheleftwithdecreasingquantities.Somedigitalvaluesmaybeconvertedintoanalogquantitiesbyadigitaltoanalog(D/A)converterforanalogcircuitcontrols.
ElectricalpowerforthesystemisdeliveredthroughaswitchingACtoDCconverter.TheMODEL4051hasthreeDCtoDCconverterstoprovideoutputandprotectionforthetripleoutputpowersupply.Each
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supplycanbemonitoredbytheDVMwhilebeingadjusted.Theauto-rangingDVMcanalsomeasuretheDCvoltageinputtedfromthelogicprobe.Theuniversallogicprobeisabletodisplayalllogicstatesinsixuniqueformats.
AmemorybackupfeaturesavessettingsandallowstheMODEL4051toworksimilartoaconventionalmechanicalswitchoperatedinstrument,restoringpreviousmodes,settings,andquantityadjustmentsfromprevioususe.Uptotendifferentdatasetscanbestoredtomemory,allowingforquickchangesbetweendifferenttestingspecificationsfordifferenttestingneeds.Abuilt-inRS232Cserialporttothecomputerenablestheusertoperformremotemonitoring,controlofsensors,orcontrolofactuatorsincorrectiveoranalyticalapplications.
TheMODEL4051isaversatileinstrument,capableofprovidingavarietyofoutputwaveformandfunctions.Togainaworkingfamiliaritywiththeunit,itisrecommendedthatitbeconnectedinitiallytoanoscilloscopesothattheeffectsofthevariouscontrolsontheoutputwaveformcanbeobserved.
3.2BASICFUNCTIONGENERATOROPERATION
Pressingthe“ADJUST”keyatanytimeduringfunctionoperationwillabortfromotherfunctionsandentertheBasicFunctionGeneratormode.Inthismode,frequencyandfrequencyrangewillbedisplayedontheLCDscreen.Asthedigitalencoderisturned,theactivequantitybeingadjustedwillbeidentifiedbyablinkingsign.
3.2.1COARSEFREQUENCYADJUSTMENT
Pressingthe“ADJUST”keyatanytimewillabortanyactiveoperationsandenterintotheBasicFunctionGeneratorinCoarseFrequencyAdjustmentmodeandtheCOARSEFREQsignwillblinkontheLCDscreentoindicatethecurrentmode.Turningthedigitalencoderclockwisewillincreasethefrequencyandturningitcounterclockwisewilldecreasethefrequencybylargeunits.Thebargraphwillalsogroworshrinktoindicatethepercentageofthecurrentadjustedquantityatthisrange.Finefrequencyadjustmentscanbemadebypressingthe“ADJUST”keyagain.
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3.2.2FINEFREQUENCYADJUSTMENT
Whenthe“ADJUST”keyispressed,thedefaultadjustmentmodeiscoarsefrequency.Pressingthe“ADJUST”keyasecondtimewillchangetheadjustmentmodetofinefrequency.FinefrequencymodeisindicatedbyablinkingFINEFREQsignontheLCDscreen.Whenthedigitalencoderisturnedduringfinefrequencymode,quantityadjustmentswillincreaseordecreasebysmallerunits.Toreturntocoarsefrequencymode,pressthe“ADJUST”keyagain.
3.2.3FREQUENCYLOCKING
Afteradesiredfrequencyistunedbycoarseorfinefrequencyadjustment,thefrequencylockingfunctionisautomaticallyactivated,holdingthevariationofthetunedfrequencywithin±0.2%.Thisfunctionisonlyavailablewhenthe“COARSEFREQ”or“FINEFREQ”isdisplayedabovethe“ADJUST”key.
NOTE:Wheneitherthe“COARSEFREQ”or“FINEFREQ”issettomaxiumorminimumquantities,the
auto-frequencylockingfeaturemaynotfunctionproperlyduetoinadequateadjustingrange.
3.2.4RANGINGSELECTION
Pressingthe“RNGUP”orthe“RNGDN”keyscaninstantlychangethefrequencybyadecade.Eightavailablerangescanbeselectedfrom2Hzto20MHz.Tousethisfunction,selecttherangeandthenadjustthefrequencybyusingthecoarseand/orfinefrequencyadjustments.Outputfrequenciesfrom0.15Hzto20MHzcanbepreciselyandrapidlyset.Thefrequencydisplayinthe2Hzrangemaytakeextratimetorespond.
3.2.5WAVEFORMSELECTION
Atanytimeexceptinfrequencycountermode,pressingthe“WAVEFORM”keycanchangetheoutputwaveform—sine,square,andtriangle.Thecorrespondingwaveformappearssequentiallyeachtimethekeyispressed.
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FIGURE3.1OutputWaveformandPhaseRelationship
3.2.6DUTYCYCLE(SYMMETRY)CONTROL
WhentheSYMkeyispressedwhileinbasicfunctiongeneratormode,themessage“DUTYCYCLE”willblinkabovetheADJUSTkeytoindicateactivationofdutycyclecontrols.Turningtheencoderclockwisewillincreasethedutycyclepercentage.Turningitcounterclockwisewilladjustthedutycyclepercentagedownward.Ifthedutycyclepercentageisabove50%,aarrowwilldisplaynexttotheADJUSTkeyandwhenthedutycyclepercentageisbelow50%,awillbedisplayed.Ifthedutycycleisatexactly50%,noarrowswillbedisplayedaslongasthegeneratoroutputsthesignal.
Pressingthe“CAL”keywillbringthesignalbacktosymmetryagainandthedutycyclearrowswilldisappear.Asthemaingeneratoroutputwaveformisasquarewave,changingthedutycycleofthegeneratorwillconvertitintorectangularwavesorpulses.Foratrianglewave,theresultisaramporsaw-toothwaveform.Forasinewave,adistortedwaveshapecalledaslewedsineisproduced.TheMODEL4051providesforsymmetryvariationfrom15%to85%.TheTTL/CMOSlogicoutputhasthesamevariation
SINE0V
SQUARE0V
TRIANGLE0V
TTL0V
CMOS0V
aarrowwilldisplaynexttotheADJUSTkeyandaarrowwilldisplaynexttotheADJUSTkeyandaarrowwilldisplaynexttotheADJUSTkeyandwhenthedutycyclepercentageisbelow50%,awhenthedutycyclepercentageisbelow50%,awhenthedutycyclepercentageisbelow50%,a
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ratewhenthewaveformkeyissetforasquarewave.Varyingthedutycyclewillresultinaslightchangeinfrequency,whichcanbecorrectedbyadjustingthecoarseorfinefrequencycontrols.
FIGURE3.2EffectofSymmetryVariation
3.2.7DCOFFSETCONTROL
ADCcomponentcanbeaddedtotheoutputsignalbypushingtheOFFSETkey.WhenDCOffsetControlisactivated,themessageDCOFFSETisflashedonthescreen.Theoffsetcomponentisadjustedusingthedigitalencoder.Positiveadjustmentsaremadebyturningtheencodercounterclockwise,resultingina“+”messageandnegativeadjustmentsaremadebyturningtheencoderclockwise,resultingina“-“messageaslongasthegeneratoroutputsthesignal.
Pressingthe“CAL”keywillrestoretheDCOffsettozeroandnosignwilldisplay.TheDCcomponentintroducedcanbevariedby±10Vasoutputinanopencircuitor±5Vtoa50OHMloadterminationwhentheamplitudecontrolknobissettoMin.Ifthedesiredoutputsignalislargeandclippingoccurs,anoscilloscopeshouldbeusedtoobservethesignal.TheDCoffsetdoesnotaffecttheTTL/CMOSoutputJack.
Pulse(Square)
Ramp(Triangle)
Slewed(Sine)
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FIGURE3.3UseofDCOFFSETControl
3.2.8 OUTPUTLEVELAMPLITUDECONTROL
Theamplitudeleveloftheoutputsignalisadjustedusingthe“Amplitude”controlknob.Rotatingthisknobclockwisevariestheoutputamplitudefromminimumto40dbaboveminimum.
Themaingeneratoroutputlevelis20Vp-pintoanopencircuitand10Vp-pintoa50OHMloadtermination.TheoutputleveloftheTTL/CMOSoutputjacksisindependentoftheOutputLevelAmplitudeControlknob.
3.3SWEEPOPERATION
TheSweepfunctionoftheMODEL4051providesautomaticvariationoftheoutputfrequency.Fromastartingsettingtoadesignatedstopsetting,thefrequencycanbeincreasedordecreasedinalinearorlogarithmicformat.Beforeenteringthesweepoperation,selectthewaveformandmakeadjustmentstothefrequency,amplitude,dutycycle,andDCoffsetoftheoutputsignalasdescribedpreviously.ToperformaSweepOperation,presstheSWEEPkeywhileinBasicFunctionGeneratormode.Thedisplay
PositiveDCOffset
NegativeDCOffset
PositiveDCOffset
NegativeDCOffset
1.ZeroDCOffset1.ZeroDCOffsetwithMaximumwithMaximumSignal
2.OffsetLimitsWithoutClipping
3.ExcessiveOffset3.ExcessiveOffset
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shouldshowthesign“LIN”undertheSWEEPkeyand”INT”undertheSOURCEkey.
•Totogglebetweenlinear(LIN)andlogarithmic(LOG)modes,presstheSWEEPkey.
•TotogglebetweenInternal(INT)orExternal(EXT)controlsignalsource,presstheSOURCEkey.
Note:DuringtheSweepoperationorafterSweepmodeisselected,somekeyswitchesaredisabled.ToabortthefunctionandreturntoBasicFunctionGeneratormode,presstheSWEEPorADJUSTkey.
ThefrequencyvariationpaceisdeterminedbytheinitialselectionofLINEARorLOGARITHMIC.Ifthesweepmodefrequencyrangeorfrequencypointsneedadjustment,presstheSETkeytostopthesweepoperationandreturntotheoriginalsetupproceduretomodifytheoperationasdesired.Ifthestartfrequencyselectedislowerthanthestopfrequency,thefrequencysweepisincreasedfromlowtohigh,otherwise,thefrequencysweepisdecreasedfromhightolow.
ToperformaSweepoperationusinginternalcontrolsignalsource:
•MakesurethesignalsourceissettoINT.PresstheSOURCEbuttontotoggle.
•Pressthe“SET”keytostrobetheselection.
•The“START”messagewillblinktopromptforadesiredstartingfrequency.
•Adjusttheencoder,therangingkeys,andthenpressthe“SET”keyagaintostrobethestartingpoint.
•Whenthe“STOP”signflashes,turntheencodertoselectthe
endingfrequency.
•Pressthe“SET”keytostrobetheselection.
•TheSweepOperationstartsandthedisplayflashesstartfrequencyandstopfrequencyandblinksthe“TIME”sign.
•Turntheencodertoadjustthesweepingtimefrom“START”to“STOP”.Whilethedigitalencoderisbeingturned,thesweepoperationwilltemporarilystop.
ToperformaSweepoperationusingexternalcontrolsignalsource:
•MakesurethatthesignalsourceissettoEXT.PresstheSOURCEbuttontotoggle.
•PresstheSETkey.“EXT”and“COARSEFREQ”willflashonthedisplaytoindicatethatthe4051isreadyforanexternalsignal.
•Usetheencodertoadjustthestartingfrequency.
•PluginanexternalcontrolvoltagesourcetotheVCG/MODBNC
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inputjack.TheMODEL4051cannowbeoperatedasavoltagecontrolledgenerator.
Thefollowingoperationscanbeperformedwithanexternalsource:
•ApplyapositiveDCvoltagetotheVCG/MODInputtodecreasethefrequency.Applyingapproximately+10Vattheinputcandecreasetheoutputfrequencybyabout10times(10:1ratio).Appliedvoltageshouldnotexceed+10.2Vortheoutputsignalmaystoposcillatingorbecomeinvalid.
•Tooperatethefunctiongeneratorasasweepgenerator,applyapositiverampsignaltotheVCG/MODinputjack.Astherampvoltageincreases,thefrequencydecreases.Therateofsweepcanbeadjustedbyvaryingthefrequencyoftherampsignal.
•AspecificfrequencycanbeselectedbyapplyingafixedDCvoltagetotheinputjack,ortheoutputfrequenciescanbesteppedbyapplyingasteppingDCvoltage.
Note:Linear(LIN)andLogarithmic(LOG)modesarenotavailablewhenusinganexternalsourcesincetheSweepmodeandtimingarefullycontrolledbytheexternalsource.
Figure3.4SweepOperation
3.4BURSTOPERATION
Theburstfunctionofthe4051allowsforthegatingcapabilityofthegeneratoroutputsignaltobeswitchedonandoffeitherbyaninternallygeneratedsignalorbyanexternallyappliedsignal.Thegatingoperationcanbeselectedas“Single”shotora“Multiple”pulsetrain.WhentheBURSTkeyispressedduringBasicFunctionGeneratormodethedisplayshowsthemessage“SINGLE”undertheBURSTkeyand“INT”undertheSOURCEkey.TotogglebetweenSINGLEandMULTPburstmode,presstheBURSTkeyagain.TotogglebetweenanInternally(INT)orExternally(EXT)triggeredsignalsource,presstheSOURCEkey.
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Note:DuringtheBurstoperationorafterBurstmodeisselected,somekeyswitchesaredisabled.Toabortthefunctionandreturnto
BasicFunctionGeneratormode,presstheBURSTorADJUSTkey.
BeforeenteringtheBurstoperation,selectthedesiredwaveformandthenadjustthefrequency,amplitude,symmetry,andtheDCoffsetofthesignalasneeded.
ToperformBurstoperationusinganInternal(INT)triggersourcein
SingleBurstmode:
•MakesureanInternal(INT)sourceisselected.
•PresstheBURSTkeytoselectSINGLEburstmodeoperation.
•PresstheSETkey.The“TIME”messagewillblinkandasingleshotofpulseispresentattheoutputjack.Theoutputsignalinburstoperationistriggeredatthemiddlepointoftherisingedge,regardlessofwhethertheMODEL4051isoperatinginsingleormultipleburstmode.Theoutputsignalburstisalwaysafullcycleincrementordecrement.
•Toadjustthetimeinbetweeneachsingleburst,turnthedigitalencoder.WhentheTIMEbargraphissetallthewaytotherightatmax.,automaticsingleburstgenerationisdisabled,andeach
singleshotmustbefiredmanuallybypressingtheSOURCEkey.
ToperformBurstoperationsusinganInternal(INT)triggersourceinMultipleBurstmode:
•MakesureanInternal(INT)triggersourceisselected.PresstheSOURCEkeytotoggle.
•PresstheBURSTkeyuntilMULTPburstmodeisselected.
•PresstheSETkey.“WIDTH”willblinkontheLCDScreen.
•TurntheDigitalEncodertoadjustthenumberofpulsesineachburst.Theburstwidthcanbecontinuouslyvariablefrom5%to90%ofinternalgatingfrequency.
•Pressthe“SET”keytostoptheburstoperationandreturntoset-upandmakeanymodificationsasneeded.
ToperformBurstoperationsusinganExternal(EXT)triggersource:
•MakesureanExternal(EXT)triggersourceisselected.PresstheSOURCEkeytotoggle.
•ConnectanexternallogiccontrolsignaltotheBURSTBNCinputjack.Theoutputsignalwillbetriggeredatthenegativegoingedgeoftheexternalsignalinasingleormultiplebursts,dependingontheBurstsetting.
Note:WidthandTimesettingsarenotavailablewhenusinganexternalsourcesincetheBurstwidthandtimeintervalsarefullycontrolledbytheexternalsource.
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Figure3.5SingleBurst/KeyPulse
Figure3.6MultipleBurst
3.5MODULATIONOPERATION
TheoutputsignaloftheMODEL4051canbeeitherfrequencymodulatedoramplitudemodulatedbytheinternal1KHzsinewavesignaloritcanbemodulatedbyanexternalsignalappliedthroughtheVCG/MODinputjack.PressingtheMODkeyduringBasicFunctionGeneratormodeactivates
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theModulationoperationandtheLCDwillshow“FM”undertheMODkeyand“INT”undertheSOURCEkeytoindicatethedefaultmodesoftheModulationoperation.PresstheMODkeytotogglebetweenfrequencymodulation(FM)andamplitudemodulation(AM).PresstheSOURCEkeytotogglebetweenanInternal(INT)orExternal(EXT)outputsignalsource.Beforeenteringthemodulationoperation,selectthewaveformandadjustthefrequency,amplitude,dutycycle,andDCoffsetoftheoutputsignalasdescribedabove.
ToperformtheModulationoperationusinganInternalSource:
•MakesureanInternal(INT)outputsignalsourceisselected.PresstheSOURCEkeytotoggle.
•PresstheSETkey.The“∆F”signwillflash,indicatingthattheoutputsignalisbeingfrequencymodulatedbytheinternal1KHzsinewavesignal.
•Turningtheencoderwillvarytheamountofdeviation.
•Pressingthe“SET”keyagainwillterminatethemodulationoperation,andreturntheusertotheoriginalstartingpoint.
•Pressingthe“MOD”keywillchangetheoperationto“AM”(amplitudemodulation).
•Pushthe“SET”keytostrobetheselection.The“%”signwillflash,andtheoutputsignalwillbeamplitudemodulatedbytheinternal1KHzsignal,reducingtheoutputsignal’samplitude.
•Turntheencoderclockwisetoincreasethepercentofmodulation,counterclockwisetodecreaseit.
ToperformtheModulationoperationusinganExternalSource:
•MakesureanExternal(EXT)modulatingsignalisselected.PresstheSOURCEkeytotoggle.
•MakesureasuitableexternalmodulatingsignalisconnectedtotheVCG/MODinputjack.
•Theoutputsignalwillbefrequencymodulatedoramplitudemodulatedbythisinputsignaldependingontheselectionofthe“MOD”keyin“FM”or“AM”.Theencodercanadjustthedegreeofthemodulationasdescribedabove.
DuringtheModulationoperationorafterModulationmodeisselected,somekeyswitchesaredisabled.ToabortthefunctionandreturntoBasicFunctionGeneratormode,presstheMODkeyorADJUSTkey.
Note:Forbestresults,thefrequencyofthecarriersignalmustbegreaterthanthefrequencyofthemodulatingsignal.
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Figure3.7ExampleofAMModulation
3.6MULTIPLEFUNCTIONOPERATION
Inadditiontothefunctiongeneratoroperationdescribedpreviously,theMODEL4051alsoperformsthefunctionsoffourotherinstruments.Toaccesstheotherinstruments,entermulti-functionmodebypressingtheFUNCTIONkey.Uponeachkey-press,theMODEL4051willstepthroughitsprogrammedfunctions,oneatatime.Functionswillcyclethroughinthefollowingorder:
Uponenteringthemultifunctionsequence,theFUNCTIONkeywillstepforwardthroughthesequenceandtheOFFSETkeywillstepbackwardsuntiltheEXTCNTRisreached(thefirstfunction).TheADJUSTkeywillabortthesequenceatanytimeandreturntoBasicFunctionGeneratormode.
3.6.1AUTORANGINGFREQUENCYCOUNTER
Tostartthisoperation,presstheFUNCTIONkeywhiletheMODEL4051isinBasicFunctionGeneratormode.Whenthedisplayshowsthemessage“EXTCNTR”and“0.00Hz”,thefrequencycounteriswaitingforasignaltobemeasured.
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Tomeasurealogicsignalorsignalwithalargeswinginamplitude:
•PluginthelogicprobeandselecttheappropriatelogicthresholdforTTLorCMOSbypushingthe“LOGIC”key.TTL5VandTTL3.3Vhavethesamelogicthreshold.TheCMOSthresholdiscontrolledbytheC-LEVEL.(Referto3.6.5.C-LEVELcontrol).
•Adjustthe“C-LEVEL”untilthevoltageisequaltotheVDDofthecircuittobemeasured.Formeasuringthefrequencywithalargeswinginamplitude,theTTLorCMOSlogicthresholdcanalsobeselectedasthetriggeringlevel.
TomeasuringanACsignalwithaDCbiasorasignalwithsmall
amplitudeswing:
•MakesurethesignalisconnectedtotheEXTCOUNTERinputjackonthefrontpanel.
•Press“LOGIC”keyuntil“VOLTAGESETTING”displays.
•Turnthedigitalencoderclockwiseuntilthebargraphisatmax.
•Adjusttheencoderinacounterclockwisedirectiontoreducethetriggeringleveluntilthefirstreadingisshown.Forastablemeasurement,continuereducingthebargraphtothemiddlepointoftheremainingbargraph.
•Thisauto-rangingfrequencycountercanmeasurethesignalfrom3Hzto35MHz,withafixedlogicthresholdasatriggeringpoint
oravariabletriggeringlevel.
•Forfrequencieslessthan3Hz,thedisplaywillflashwith0.00Hzindicatingthattheunderrangeisdetectedandtheusermustchangetolowfrequencycounterforlowerfrequencymeasurement.Uponenteringfrequencycountermode,allthewaveformgeneratorfunctionsoftheMODEL4051aredisabled,butthefunctionsofthetripleoutputpowersupplyandlogicprobearestillavailable.
•Thelogicprobewillbedisabledoncevariablevoltagesettingmodeisselected.
3.6.2LOWFREQUENCYCOUNTEROPERATION
WhentheMODEL4051issettofrequencycounter(EXTCNTR)mode,pressingtheFUNCTIONkeyproducesthe“EXTCNTRTOTAL”messageand“0.00Hz”ontheLCD.Thelowfrequencycounteractslikeatimerandisabletomeasureslowereventsfrom0.04Hzto3Hz.
Inputtothelowfrequencycountermustbemadethroughthelogicprobeandnotfromthe“EXTCOUNTER”inputjack.Selectingtheappropriatetriggeringlevelandinputportforthelowfrequencycounteroperationisidenticaltotheproceduredescribedinsection3.6.1.Forasignalwithfrequency
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over3Hz,thedisplaywillflashwith“3.00Hz”,indicatinganover-rangedetection.Itwillbenecessarytoshiftbacktofrequencycounter(EXTCNTR)modeformeasurementofhigherfrequenciesbypressingtheOFFSETkey.Sincethelowfrequencycounterisdesignedtomeasureslowevents,itwilltakelongerbeforeitsreadingsaredisplayedontheLCD.Signalsbelow0.04Hzarenotmeasuredandthedisplaywillremainunchangedat0.00Hz.
Duringlowfrequencycounteroperations,thepreviousmeasurementreadingwillbeclearedonlyasthenexteventcycleisdetected.Thereadingwillnotautomaticallyresetto0.00Hzlikeitdoesduringthefrequencycounteroperation.Thedisplaycanbemanuallyresetto0.00HzbypressingtheCALkey.
Note:Uponenteringthelowfrequencycountermode,thefunctionofthewaveformgeneratorisdisabled.Onlythepowersupplyandlogicprobearestillavailable.Alltheconditionsandapplicationsremainunchangedasinfrequencycountermode.
3.6.3TOTALIZECOUNTER(TOTAL)OPERATION
WhentheFUNCTIONkeyispressedwhileinlowfrequencycounter(EXTCNTRTOTAL)mode,theLCD
willshowthemessage“TOTAL”and“0”,indicatingastepthroughintotheTotalizeCounterOperation.Thetotalizecountercountsthenumberoftransitionsinaseriesofpulsetrainswithrandomfrequenciesandsequencesandaggregatesthecounts.Thecounteristriggeredatthepositivegoingedgeoftheinputclockandwillcountupto999,999withabandwidthofDCto5.0KHz.Toselecttheappropriatelogicthreshold,triggeringlevel,andsignalinputport,followtheprocedureoutlinedinsection3.6.1.ToinitiatetheTotalizeCountertoperformanewreading,presstheCALkeytoresetthecounterto0.
Note:UponenteringtheTotalizeCountermode,thefunctionofthewaveformgeneratorisdisabled.Onlythepowersupplyandlogicprobearestillavailable.AlltheconditionsandapplicationsremainunchangedasintheLowFrequencyCountermode.
3.6.4DIGITALVOLTMETER(DVM)OPERATION
Thenextstepinthemulti-functionsequenceaftertheTotalizeCounteristheDigitalVoltmeteroperation.WhentheFUNCTIONkeyispressedtostepforward,theLCDwillshowthemessage“DVM”andthevoltage.TheDVMoperationisabletomeasuretheDCvoltageupto±250Vinthreeauto-rangingmeasurementsinput
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fromthetipofthelogicprobe.WhileperformingDVMoperations,thewaveformgeneratorisabletomakechangesinthefrequencyrange,waveform,andcoarsefrequency.TheDCoffsetanddutycyclewillbedisabledbutbothsettingscanbeadjustedpriortoenteringintomulti-functionmode.
SincetheLOGICkeycontrolsthelogicprobe’svoltagethresholdandthepowersupplymaintainsthepresetoutputvoltages,settingthemulti-functionsequencein“DVM”modeallowsforthemostconvenienceinperformingmultipletestingoperationssimultaneously.
3.6.5CMOSLOGICOUTPUTLEVELADJUSTMENT
PressingtheFUNCTIONkeyfromtheDVMOperationwilladvanceintotheCMOSLogicOutputLevelAdjustmentOperationwhichisindicatedbythemessage“C-LEVEL”andthepreviousadjustedVDDsupplyvoltageforCMOSlogicdisplayedontheLCD.TheVDDsupplyvoltagemaybechangedusingthedigtialencoder.Turningtheencoderclockwiseincreasesthevoltageupto16.0V.Counterclockwiserotationsdecreasesthevoltagedownto3.0V.
NotethatthevoltagebeingdisplayedandadjustedisactuallytheVDDvoltagethatisbeingappliedtotheCMOSOutputDriverandnottheactualCMOSoutputsignallevel.Undernormalconditions,theCMOSoutputsignallevelisslightlylessthanitsVDDsupplyvoltage.
TheusercanalsoviewthechangefromanexternallyconnectedscopebyconnectingthescopeinputtotheTTL/CMOSoutputjackandthensettingtheLOGICkeysettingtoCMOS.TheC-LEVELAdjustmentfunctioncontrolstheCMOSoutputlevelswingandalsothethresholdoftheCMOSlogicprobe.C-LEVELvoltagelevelsmustbeadjustedtobeequalorclosetothevoltageofthecircuitundertest.OncetheC-LEVELvoltagevalueisset,steppingforwardorbackwardinthemultifunctionsequencewillnotaffectitsvalue.TochangetheC-LEVELvoltagevalue,theC-LEVELOperationmustbeaccessedagainbysteppingforward(FUNCTION)orbackward(OFFSET)intoitfrommultifunctionmodeoperation.
Note:TheoutputfrequencyoftheCMOSlogicincreasesasthesupplyvoltageincreases(7MHz@15V).
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3.6.6POSITIVEPOWERSUPPLY(+Vs)ADJUSTMENT
PressingtheFUNCTIONkeyfromtheC-LEVELOperationstepstheMODEL4051intothePositivePowerSupplyAdjustmentOperation,indicatedbythemessage“+Vs”andthepreviouslyadjustedvoltageontheLCD.Adjustmentscanbemadetothevoltageusingthedigitalencoder.Clockwiseturnsoftheencoderwillincrementthevoltageupto24Vandcounterclockwiseturnswilldecreasethevoltagedownto0V.
Duringthisoperation,theCALkeywillturnonoroffTRACKINGfunctionality.AftertheCALkeyispressedandthemessage“TRACKING”isshownonthedisplay,thenegativepowersupply(-Vs)willbeadjustedtomirrorthepositivepowersupply(+Vs)voltagevalueintheoppositepolarity.OnceTRACKINGmodeisdeactivated,thepositiveandnegativepowersupplyvoltagescanbeadjustedseparatelyagain.
OncethePositivePowerSupplyadjustmentisset,itwillremainsetwhileotherfunctionsareaccessed.Tochangethe+Vsvalue,thePositivePowerSupplyAdjustmentoperationmustbeaccessedagainbysteppingintoitwhileinmultifunctionoperationmode.
3.6.7 NEGATIVEPOWERSUPPLY(-Vs)ADJUSTMENT
PressingtheFUNCTIONkeyfromthePositivePowerSupplyAdjustmentOperationwillstepintotheNegativePowerSupply(-Vs)AdjustmentOperation,whichisindicatedwiththemessage“-Vs”andthepreviousadjustedvoltagevalueontheLCD.Thevaluecanbeadjustedusingthedigitalencoderwithclockwiseturnsincreasingvoltageupto-24Vandcounterclockwiseturnsdecreasingvoltagedownto0V.
Duringthisoperation,theCALkeywillturnonoroffTRACKINGfunctionality.AftertheCALkeyispressedandthemessage“TRACKING”isshownonthedisplay,thenegativepowersupply(-Vs)willbeautomaticallyadjustedtomirrorthepositivepowersupply(+Vs)voltagevalueintheoppositepolarity.OnceTRACKINGmodeisdeactivated,thepositiveandnegativepowersupplyvoltagescanbeadjustedseparatelyagain.
OncetheNegativePowerSupplyadjustmentissetinthisoperation,itwillremainsetwhileotherfunctionsareaccessed.Tochangethe-Vsvalue,theNegativePowerSupplyAdjustmentoperationmustbeaccessedagainbysteppingintoitwhileinmultifunctionmode.
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3.6.8 LOGICPOWERSUPPLY(Vcc)CONTROL
PressingtheFUNCTIONkeyfromtheNegativePowerSupply(-Vs)AdjustmentOperationwillstepintotheLogicPowerSupply(Vcc)Controloperation,whichisindicatedwiththemessage“Vcc”and5.0Vor3.3V(dependingupontheLOGICkeysetting)displayingontheLCD.The5.0VvalueisselectedwhentheLOGICkeyissettoTTL5VmodeorwhenCMOSisselected.The3.3VvalueisselectedwhentheLOGICkeyissettoTTL3.3Vmode.
Note:Changingthelogicpowersupplymodewhilepowerisbeingappliedtothecircuitundertestmayresultinpermanentdamagetothecircuit.DonotchangethelogicpowersupplymodewhilethecircuitisbeingpoweredbytheMODEL4051.
TheLogicPowerSupply(Vcc)ControlOperationisthelaststepinthemultifunctionoperationsequence.PressingtheFUNCTIONkeywillcycletheuserbacktothefirststepofthesequence,andreturntoBasicFunctionGeneratormode.
3.7TTL/CMOSLOGICCONTROLOPERATION
The“LOGIC”keyisusedtoselectthesignaloutputattheTTL/CMOSoutputjack,thethresholdlevelofthelogicprobe,triggeringlevelofthecounter,andthelogicpowersupply.
-Forinjectingthesignal,connectthelogicpowersupplytotheexternalTTLcircuitandthenpressthe“LOGIC”keytoselectTTLmodeof5.0Vor3.3V(dependingonexternalcircuit).
-TheTTL5Vand3.3Voperationshavethesamefixedlogicthreshold.SettingtheTTLmodetothecorrectlevel(5Vor3.3V)willallowthelogicprobetofunctionproperlyforeithertypeofcircuit.
-ThethresholdoftheCMOSlogicvariesasitssupplyvoltagechanges.Toaddressthis,adjusttheCMOSlogicvoltageequalorclosetotheexternalCMOScircuit’ssupplyvoltageandpressthe“LOGIC”keytotogglethemodeto“CMOS”beforeinjectingthesignalorprobingthelogicprobeintothecircuit.
-Inordertousethelogicprobetomeasurethefrequencyofalargeamplitudesignal,theappropriatelogicthreshold(TTLorCMOS)mustbeselectedforthedesiredtriggeringlevel.
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3.8PROGRAMMEMORYOPERATION
ThememorybackupfeatureallowstheMODEL4051toworksimilartoaconventionalmechanicalswitchoperatedinstrument.Allpreviousmodes,settingsandquantityadjustmentsarerestoredimmediatelyafterpowerup.TheMODEL4051alsofeaturesdatamemorywhichstoresuptotendifferentfilesthatcanberetrievedwiththepressofakey.MemorystorageorretrievaloperationscanonlybeperformedfromtheBasicFunctionGeneratormodewhichcanbeaccessedatanytimebypressingtheADJUSTkey.
3.8.1 PROGRAMMEMORYSTORAGEOPERATION
AlladjustmentsandvaluesusedintheMODEL4051’smanyoperationscanbesavedtomemoryandretrievedforfutureuse.TheMODEL4051hasroomforelevenstoredfiles,oneforstorageofactivedatafromcurrentoperationsandtenforpermanentstorage.
Tostoreallcurrentvaluesandadjustmentstoafile,presstheSOURCEkeywhileinBasicFunctionGeneratormode.Thedisplaywillchangetoshow“P-01”andwitheachkeypress,thenumber
incrementsupto“P-10”.Thesearestorageslotsfordatafiles.Slotsthatarealreadyusedwillbemarkedwitha“CAL”signwhenitsnumberisdisplayed.Unusedslotsdonotshowthe“CAL”sign.TheusercansavecurrentvaluestoanyslotbypressingtheSETkey.Savingdatasetstoanoccupieddataslotwillresultinthelossofthedataintheslotasthecurrentdataoverwritesthepreviouslystoreddata.
3.8.2 PROGRAMMEMORYRETRIEVAL
FilesstoredusingtheProgramMemoryStorageOperationcanberetrievedfromtheBasicFunctionGeneratormodebypressingtheSOURCEkeyuntilthedesireddatasetisreached.Toretrievethedataset,presstheCALkey.Thestoredvaluesandsettingswillbeloadedintoactivememoryandallsubsequentadjustmentsinoperationswillbeperformedfromtheretrievedvaluesandmodes.Toterminateamemoryprogramoperationandreturntobasicfunctionmode,presstheADJUSTkey.
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Button Key Button KeyRNGUP U RNGDN DOFFSET O CAL CSOURCE R SET SADJUST A FUNCTION FSWEEP P BURST BMOD M SYM YLOGIC L WAVEFORM W
Eachfunctionkeyisrepresentedbyakeyonthecomputerkeyboard
PressingthecorrespondingkeyonthecomputerperformsthesamepurposeaspushingtheactualkeyontheMODEL4051’sfrontpanel.PresstheENTERkeytoviewchangesorresponsesfromthe4051.
TheDigitalEncodercanbeadjustedeitherbystepsorbytheminimumamount.Thenumericalkeysonthecomputerkeyboardrepresentthepercentageofbargraphadjustmentswithinthewholerange.
0—0%,1—10%,2—20%,3—30%,4—40%,5—50%,6—60%,
7—70%,8—80%,9—90%,*100%(FullRange)
TheuseradjuststhequantitybyenteringtheappropriatenumericalnumberinastepwiseincreasingordecreasingpatternandthenpressestheENTERkey
3.9COMPUTERREMOTECONTROLOPERATION
TheRS-232CserialportonthebackpaneloftheMODEL4051providesacommunicationinterfacetoacomputerforremotecontrolledoperation.TheinterfacecablehasDB9subfemale-to-maleconnectors.Theconnectionsbetweenthesetwoconnectorsarepin-to-pinstraightconnections.ThesettingsoftheRS232protocolshaveabaudrateof9600bpsin8-bit,onestop,noparitymode.AftertheinputsandoutputsoftheMODEL4051areconnectedtotheexternaldevices,whichmaybeeithersensorsoractivators,remotemonitoringandcontrolofthesedevicescanbeperformedforcorrectionaloranalyticalapplicationsthroughtheconnectedcomputeroranetworkedcomputer.
Allfunctionscanbecontrolledremotelybyacomputerexceptfortheamplitudecontrolpotentialfortheoutputsignal.OnWindowsoperatingsystems,noadditionalsoftwareisrequired.ThestandardTerminalprogramcanbeusedtoremotelycontrolthe4051.
Whenconnectedtoaremotecontrolpoint,the4051respondstothefollowingkeyboardcommands.
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toviewtheresponse.Highlyspecificnumberscanalsobeobtainedbypressingthe+or–keysonthekeyboardtoincrementordecreasebytheminimumadjustment.
3.10FACTORYDEFAULTSETTINGS
Whentheresetkeyispressedandhelddown,thetenstorageslotsareclearedandtheactivesettingsdefaultbacktotheoriginalfactorysettings(listedbelow).
FrequencyRange:20KWaveform:SineWaveCoarseorFineFrequencyAdjust:BargraphintheMidRangeDCOffset:0(midrange)DutyCycle:50%(midrange)Logic:TTL5V(controlslogicprobethreshold.LogicsignalandpowersupplyVccoutputs)CounterTriggeringVoltage:MidRange+Vs:12V(MidRange)TRACKING:Off-Vs:-12V(MidRange)C-LEVEL:5VSource:INT(Internal)SWEEP:LIN(Linear)StartFrequency:MaximumSettingStopFrequency:MinimumSettingTIME:MidRangeBURST:SingleMOD:FMFM:MidRange
3.11INPUTANDOUTPUTPROTECTION
ExcessivevoltagepresentattheinputoroutputoftheMODEL4051maycauseinternalcircuitdamage.Theusershouldbeawareofthemaximumlimitationsofeachport.
3.11.1BNCOUTPUTJACK
The50OHMmaingeneratoroutputiscontinuouslyprotectedupto±25Vandfromshortcircuitstotheground,whileprovidinga20Vp-poutputsignalintotheopencircuitand10Vp-pintothe50OHMload.TheTTL/CMOSlogicsignaloutputisalsocontinuouslyprotectedupto±25Vandfromshortcircuitstotheground.
3.11.2BNCINPUTJACK
The“ExtCounter”protectsuptothemaximummeasurementrangeof±260VDC/ACcontinuously.The“VCG/MOD”and“BURST”inputjackareprotectedupto±25Vcontinuously.
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3.11.3LOGIC/DVMPROBEINPUT
Thelogicprobetipprotectsuptothemaximummeasurementrangeof±260VDC/ACcontinuously.
3.11.4POWERSUPPLY
AllthetripleoutputpowersuppliesontheMODEL4051areequippedwithshortcircuit,over-current,over-temperatureandover-voltageprotection.AlthoughtheMODEL4051hasbeencarefullydesignedwithappropriateprotectivecircuitry,exceedingthelimitationsmaystillcausedamage.
Thefollowingprotectivemeasuresandconsiderationsarehighlyrecommended:
•Verifythatallsignalinputsareconnectedtovalidinputsources.
•Verifythepolarityofconnectionspluggedintothepowersupplyports.
•Forcontinuousoperationofthetripleoutputsupplies,limittotalmaximumoutputpowertounder80W.
TheswitchingACtoDCconverter,whichsuppliesallthepowertotheMODEL4051,hasamaximum
outputpowerof120W.Ifthetotalpowerexceedsthislimit,theswitchingpowersupplywillbeturnedoffautomatically.Torestorepowerturnoffthepowerswitch,waitforafewseconds,andthenturnthepowerswitchbackonagain.
3.12ONE-STEPOUTPUTAMPLITUDECONTROL
InadditiontotheoutputamplitudecontrolavailablethroughtheAmplitudePotentialknob,the4051alsofeaturesaone-stepoutputamplitudecontrolthatwilldecreaseorincreasetheoutputamplitudeby20dB.
Whenthe4051isnotinmultifunctionsequencemode,one-step20dBoutputamplitudecontrolcanbeaccessedbypressingthe“CAL”key.Pressingthe“CAL”keythefirsttimewilldecreasetheoutputsignalby20dBandthe“CAL”signwillappearontheLCDscreentoindicatethattheone-stepoutputamplitudecontrolfunctionisactive.Pressingthe“CAL”keyagainwillincreasetheoutputsignalby20dB.
Whileinfunctiongeneratormode,pressingthe“CAL”keywillfirstresetthedutycycleto50%andtheDCoffsettozeroiftheyarenotalreadyneutral.
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OPERATION
Subsequentkeypressesofthe“CAL”keywilladjusttheoutputsignaldownorupby20dB.Adjustmentsmadeusingtheone-stepamplitudecontrolfunctioncanbefinetunedbyturningtheamplitudepotentialknob.
3.13LOGICPROBEOPERATION
Thefurnishedlogicprobeallowstheusertoanalyzethecircuitactivitiesonthecircuitboard.ThefrequencyorDCVoltagewiththelogicstateofthesignalscanbemeasuredanddisplayedsimultaneously.LogicsignaldataisdisplayedthroughtheredandgreenLEDlightsonthelogicprobe.
LOGICLOW
LOGICHIGH
SQUAREWAVE
(+)GOINGPULSE
(-)GOINGPULSE
TRI-STATE
2v
0v
2v
0v
2v
0v
2v
0v
2v
0v
2v
0v
REDLED
OFF ON FLASH* OFF FLASH OFF
GREENLED
ON OFF FLASH* FLASH OFF OFF
*ThelightintensityoftheflashingRedandGreenLEDsindicatesthedutycycleoftheclock.
Forthelogicprobetofunctionproperly,thecorrecttypeandvoltagethresholdmustbeselected.MakesurethatTTL3.3VorTTL5.0Vmodeisselected
fortestingTTLcircuitsandCMOSmodeforCMOScircuits.InCMOSmodethe“C-LEVEL”voltagelevelmustbeadjustedtobeequalorcomeclosetotheVddofthecircuitundertest.
3.14LIMITATIONSOFTHENEGATIVEPOWERSUPPLY
Forcontinuousoperation,the4051’snegativeoutputpowersupplyhasoutputcurrentlimitations.Whentheoutputvoltageis-24V,themaximumavailablecurrentis1.5A.
Astheoutputvoltagedecreases,thevoltagebetweentheinputandoutputoftheregulatorincreasesandexcessheatisgenerated.Ifoutputcurrentweremaintainedatmaxiumlevels,thermalshut-downofthelinearregulatorcouldoccur.Withloweroutputvoltages,outputloadingmustbereduced.Astheoutputvoltagedropsbelow-5V,thecurrentshouldbelimitedto.5A.
ThePositiveSupply(+Vs)doesnothavethesamelimitationsastheNegativePowerSupply(-Vs)becauseitisaswitchingregulator.
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OPERATINGSTEPS&TROUBLESHOOTING
makeadjustmentstotheoutputsignaldutycycle.
5.PresstheOFFSETkeytoadjusttheDCOffsettotheoutputsignal.
6.PresstheCALkeytoresettheDutyCycleandDCOffsetbacktoneutral.
7.PresstheLOGICkeytoselecttheTTL/CMOSlogicoutputsignalforTTL5V,TTL3.3V,orCMOS.
8.PresstheSETkeytoturnON/OFFtheLCDbacklight.
4.3FREQUENCYSWEEPINGOPERATION
PresstheADJUSTkeytoreturntobasicfunctiongeneratormode.
(A)Linear(LIN)SweepingwithInternal(INT)ControlSource
1.PresstheSWEEPkey.
2.PresstheSETkey.
3.Turntheencodertoadjustthestartingfrequency.
4.PresstheSETkey.
5.Turntheencodertoadjustthestopfrequency.
SECTIONFOUR:OPERATINGSTEPSANDTROUBLESHOOTING
4.1INTRODUCTION
Inthepreviouschapter,alloperationsoftheMODEL4051weredescribedindetail.Forimprovedeaseofuse,thischapterprovidesstep-by-stepoperatinginstructionsforeachofthe4051’sapplications.
4.2BASICFUNCTIONGENERATORMODE
PressingtheADJUSTkeyatanytimewillabortanyactivefunctionsandreturntheusertotheBasicFunctionGeneratorincoarsefrequencyadjustmentmode.
1.PresstheADJUSTkeyagaintotoggleintofinefrequencyadjustmentmodeifdesired.
2.PressRNGUPorRNGDNtoselectthefrequencyrange.
3.PressWAVEFORMtoselecttheoutputsignalwaveforminsine,squareortriangle.
4.PresstheSYMkeyandturnthedigitalencoderknobto
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OPERATINGSTEPS&TROUBLESHOOTING
6.PressSETkey.
7.TheSweepingoperationispresentattheoutput.Turntheencodertoadjustthesweepingspeed.
8.PressSETkeytostoptheoperationandreturntostep(2).PressSWEEPkeyorADJUSTkeytoabortthesweepingoperation.
(B)Logarithm(LOG)SweepingwithInternal(INT)ControlSource
1.PresstheSWEEPkeytwice.
2.Remainingstepsareidenticaltothestepsgivenforlinearsweeping,fromstep(2)tostep(8).
(C)FrequencySweepingwithExternal(EXT)ControlSource
1.PressSWEEPkey.
2.PressSOURCEkeytoswitchtoexternalcontrolsource.Sweepmodeoptions(LIN)or(LOG)willbecomedisabled.
3.PressSETkey.When“EXT”and“COARSEFREQ”flashesonthedisplay,turntheencodertoadjustthemax.startingfrequency.
4.ApplypositivesteppingorrampingsignalstotheVCG/MODinputjack.Atthestartingmax.frequency,theappliedsignalmustbe10.0Vorlower.Asthefrequencydecreases,themax.allowedvoltagealsodecreases.
-theoutputfrequencydecreasesasthevoltagerisesover +10.2Vandtheoutputsignalwillstoposcillatingorwill
generateaninvalidsignal.
-thefrequencyvariationspeeddependsonthefrequencyoftheinputsignal.
5.Pressthe“SET”keytostoptheoperation,andreturntostep(2).Pressthe“SWEEP”keyorthe“ADJUST”keytoaborttheoperation.
4.4OUTPUTSIGNALBURSTOPERATION
Pressthe“ADJUST”keytoreturntobasicfunctiongeneratormode.
(A)SINGLEburstwithInternal(INT)ControlSource
1.Pressthe“BURST”key.
2.Pressthe“SET”key
-Asingleburstsignalwillbepresentattheoutput.
-Turntheencoderandadjusttheburst“TIME”tomaxium.Eachpulsecanbegeneratedmanuallybypressingthe“SOURCE”key.
3.Press“SET”keytostoptheoperationandreturntostep2.Press“BURST”keyor“ADJUST”keytoaborttheoperation.
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OPERATINGSTEPS&TROUBLESHOOTING
(B)Multiple(MULTP)BurstwithInternal(INT)ControlSignal
1.PresstheBURST”keytwice.
2.Pressthe“SET”key
-multipleburstsofthesignalwillbepresentattheoutput
-turntheencodertoadjustthenumberofpulsesinaburst(burstwidth).
3.Pressthe“SET”keytostoptheoperationandreturntostep(2).Pressthe“BURST”keyorthe“ADJUST”keyatanytimetoaborttheoperation.
(C)SINGLEBurstwithExternal(EXT)ControlSignalSource
1.Pressthe“BURST”key.
2.Pressthe“SOURCE”key.
3.Pressthe“SET”key.
-Asinglesignalburstwillbefired,triggeringonthenegativegoingedgeofthecontrolsignalconnectedtothe“BURST”BNCinputjack.
4.Pressthe“SET”keytostoptheoperationandreturntostep(3).Pressthe“BURST”keyor“ADJUST”keytoaborttheoperationatanytime.
(D)Multiple(MULTP)BurstwithExternalControlSource
1.Pressthe“BURST”key.
2.Pressthe“SOURCE”key.
3.Pressthe“SET”key.
4.Amultiplesignalburstwillbefired,triggeringonthenegativegoingedgeofthecontrolsignalconnectedtothe“BURST”BNCinputjack.Theburstwidthandtimingdependsonthecontrolsignal’sdutycycleandfrequency.
5.Pressthe“SET”keytostoptheoperationandreturntostep(3).Pressthe“BURST”keyor“ADJUST”keytoaborttheoperationatanytime.
4.5OUTPUTSIGNALMODULATIONOPERATION
Pressthe“ADJUST”keytoreturntobasicfunctiongeneratormode.
(A)FrequencyModulate(FM)theOutputSignalwithInternal(INT)
1KHzSineWave
1.Pressthe“MOD”key.
2.Pressthe“SET”key.
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OPERATINGSTEPS&TROUBLESHOOTING
3.Theoutputsignalisfrequencymodulatedbytheinternal1KHzsinesignal.Turntheencodertoadjustthedegreeofthefrequencydeviation.
4.Pressthe“SET”keytostoptheoperation,andreturntostep(2).Pressthe“MOD”keyor“ADJUST”keytoaborttheoperation.
(B)AmplitudeModulate(AM)theOutputSignalwithInternal(INT)1KHzSineWave
1.Pressthe“MOD”keytwice.
2.Pressthe“SET”key.
3.Theoutputsignalisamplitudemodulatedbytheinternal1KHzsinesignal.Turntheencodertoadjustthepercentageoftheamplitudemodulation.
4.Pressthe“SET”keytostoptheoperation,andreturntostep(2).Pressthe“MOD”keyor“ADJUST”keytoaborttheoperationatanytime.
(C)FrequencyModulate(FM)theOutputSignalwithExternal(EXT)
SignalSource
1.Pressthe“MOD”key.
2.Pressthe“SOURCE”key.
3.Pressthe“SET”key.
4.TheoutputsignalisfrequencymodulatedbytheexternalsignalconnectedtotheVCG/MODBNCinputjack.Turntheencodertoadjustthedegreeoffrequencydeviation.
5. Pressthe“SET”keytostoptheoperation,andreturntostep(3).Pressthe“MOD”or“ADJUST”keytoaborttheoperationatanytime.
(D)AmplitudeModulate(AM)theOutputSignalwithExternal
(EXT)SignalSource
1.Pressthe“MOD”keytwice.
2.Pressthe“SOURCE”key.
3.Pressthe“SET”key.
4.TheoutputsignalisamplitudemodulatedbytheexternalsignalconnectedtotheVCG/MODBNCinputjack.Turntheencodertoadjustthepercentageofamplitudemodulation.
5.Pressthe“SET”keytostoptheoperation,andreturntostep(3).Pressthe“MOD”or“ADJUST”keytoaborttheoperationatanytime.
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OPERATINGSTEPS&TROUBLESHOOTING
4.6FREQUENCYCOUNTER,LOWFREQUENCYCOUNTER,ANDTOTALIZECOUNTEROPERATION
Thefrequencycountermeasuressignalfrom3Hzto35MHz.Thelowfrequencycountermeasuressignalfrom0.04Hzto3Hz,andtheTotalizecountercountsthetransitionofthesignal.Duringtheoperationofthesethreecounters,thefunctiongeneratorisdisabledasaresultofhavingnooutputsignalattheTTL/CMOSandmaingeneratoroutputduetocircuitsharing.
(A)Measuringthelogicsignalorasignalwithlargeswingin
amplitude.
1.PlugthelogicprobeintotheLOGIC/DVMsocket
2.Pressthe“FUNCTION”keyonceforthefrequencycounter(EXTCNTR).Presstwiceforthelowfrequencycounter(EXTCNTRTOTAL).PressthreetimesfortheTotalizecounter(TOTAL).
3.Press“LOGIC”keytoselecttheappropriatelogicthresholdforthetriggeringvoltageofthecounter.
4.Probethesignalsourcewiththetipofthelogicprobe,themeasurementresultwilldisplayontheLCDscreen.
5.Thelowfrequencycountermeasuresslowereventsandneedsmoretimetocompleteacycle.Thepreviousresult
willbeclearedatthetriggeringedgeofthenexteventormanuallybypressingthe“CAL”key.
6.WhenoperatingtheTotalizeCounter,the“CAL”keyneedstobepressedtoclearthedisplaybeforethenextmeasurementcanbetaken.
(B)MeasuretheACsignalwithaDCbiasoraSignalwithsmallAmplitudeswing.
1.Connectthesignaltothe“EXTCOUNTER”BNCinputjack.
2.Pressthe“FUNCTION”keytoselectoneoftheCounterfunctions.
3.Pressthe“LOGIC”keyuntilthedisplayshows“VOLTAGESETTING”.
4.Turntheencodertoadjustthetriggeringvoltagelevelofthecounteruntilastablereadingisreached.
4.7MULTI-FUNCTIONSIMULTANEOUSOPERATION
1.AdjusttheDutyCycleandDCOffsetofthegeneratorasneeded.
2.Pressthe“FUNCTION”keytoadjustthevoltageofthepowersupply(+Vsand–Vs)forthecircuitbeingtested.
3.Pressthe“LOGIC”keytoselecttheappropriatelogicfamily
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OPERATINGSTEPS&TROUBLESHOOTING
forthecircuitandthelogicprobe.
4.Pressthe“OFFSET”keytobackstepto“DVM”mode.
5.Thelogicprobecannowanalyzecircuitactivity.
-TheLCDscreenshowsthevoltagereadingofthetestprobebeingprobed.
-Thetripleoutputpowersupplymaintainsthepresetoutputvoltage.
-Thewaveformgeneratorisstillavailabletotheuserformakingchangestothefrequencyrange,waveform,andcoarsefrequency.
4.8POSITIVEANDNEGATIVE(+Vs&-Vs)POWERSUPPLYADJUSTMENT
(A)SeparatePositiveandNegativeAdjustments.
1.Pressthe“FUNCTION”keyuntildisplayshows“+Vs”
2.AdjustthepositivevoltagebyturningtheencoderclockwisetoincreasethevoltageandturningitcounterclockwisetodecreasethevoltageuntilthedesiredoutputvoltageisdisplayedontheLCD.
3.Pressthe“FUNCTION”keyagain.Thedisplayshouldshow“-Vs”toindicatenegativevoltageadjustmentmode.
4.Adjustthenegativevoltageusingthedigitalencoderasinstep2.
(B)SynchronizedPositiveandNegativeAdjustments(DualTracking)
1.Pressthe“FUNCTION”keyuntilthedisplayshowseither“+Vs”or“-Vs”andthepreviouslysetvoltage.
2.Pressthe“CAL”key.
3.The“TRACKING”signwillbedisplayedandthenegativepolaritywillinstantlytracktothepositivepolarity.When“TRACKING”modeisactivated,anyadjustmentsmadetothepositive(+Vs)ornegative(-Vs)polaritywillchangethepositive(+Vs)polarityandtrackthenegative(-Vs)polaritytomatchit.
4.Pressthe“CAL”keyagaintoturnoff“TRACKING”.Ifnoadjustmentsweremadetothevoltagequantitywhile“TRACKING”modewason,thenegative(-Vs)polaritywillberestoredtoitspre-trackingvalue.Ifanyvoltagevalueadjustmentsweremadeduring“TRACKING”modebyturningthedigitalencoder,boththepositive(+Vs)andnegative(-Vs)polarityvalueswillremainattheiradjustedtrackedvalues.
4.9CMOSOUTPUTLEVEL(C-LEVEL)ANDADJUSTMENT
ThedefaultC-leveloutputvalueissetto5V.ForaCMOScircuitwithVddsupplyvoltageotherthan
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OPERATINGSTEPS&TROUBLESHOOTING
5V,adjusttheC-LEVELuntilit’sequalorclosetothesupplyvoltage.ThiswillallowtheCMOSoutputsignalandthethresholdofthelogicprobetoaccommodatethecircuitundertest.
1.Pressthe“FUNCTION”keyuntilthedisplayshows“C-LEVEL”withtheprevioussettingvoltage.
2.TurntheencoderclockwisetoincreasethevoltageandcounterclockwisetodecreasethevoltageuntilthedesiredVddisreached.
Note:ThetheactualCMOSoutputsignallevelisslightlylessthanthedisplayed“C-LEVEL”Voltage.
4.10PROGRAMMEMORYOPERATION
Pressthe“ADJUST”keytoreturntobasicfunctiongeneratormode.
(A)ToSaveCurrentSettingstoMemory
1.Pressthe“SOURCE”keytoscrollthroughthetenstorageslots.Occupiedslotsaredenotedwiththe“CAL”sign.
2.Pressthe“SET”keytosaveactivesettingstothenumberedstorageslotshownonthedisplay.Iftheslotisoccupied,thedatasavedinitwillbeoverwrittenwiththecurrentactivesettings.
(B)ToRetrieveSavedSettingsfromMemory
1.Pressthe“SOURCE”keytoscrollthroughthetenstorageslots.
2.Stoponthedesiredprogramnumber.Theslotshouldbemarkedwiththe“CAL”sign,indicatingthattheslotisbeingusedfordatastorage.
3.Pressthe“CAL”keyandthesettingssavedtothememoryslotwillberetrievedandloadedforimmediateuse.
4.11RS-232CCOMPUTERINTERFACEEXAMPLE
MostPCsrunningtheWindowsoperatingsystemsareabletosupporttheRS-232CinterfaceusedbytheMODEL4051toconnecttoacomputerforremotetestingoperations.Noadditionalsoftwareisrequired.Thefollowingset-upinstructionsfortheremoteinterfacearewrittenspecificallyfortheWindows98operatingsystem.Set-upforotherWindowsoperatingsystemsshouldbesimilar.
1.UsetheDB9MaletoFemaleSerialCableforstraightthroughconnections.
2.ConnectthemalesideoftheDB9cabletotheMODEL4051andthefemalesidetotheCOM1portofthePC.IfCOM1isinuse,plugitintotheCOM2port.
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OPERATINGSTEPS&TROUBLESHOOTING
3.FromaWindowsPC,launchtheHyperterminalprogramoranequivalentterminalprogram.
4.ChangetheHyperterminalprogram’ssettingstoconnectdirectlytotheCOMportthecablewaspluggedinto.
5.Connectusingthefollowingparameters:
Bitspersecond:9600Databits:8Parity:NoneStopbit:1Flowcontrol:Xon/Xoff
Click“OK”toexittothenextwindow.ThechosenICONnamewillshowonthescreen.(OncetheICONnamehasbeensetup,justdoubleclickitonthecommunicationwindow.
6.MakesureallcableconnectionsaresecuretothecomputerandtheMODEL4051,thenturnonthe4051.
7.Pressthe“ENTER”keyonthecomputerkeyboard.Iftheremoteinterfaceset-upwassuccessful,youshouldtheinformationinfigure4.1onthecomputermonitorscreen.
8.Tooperatethe4051throughtheremoteinterface,pleaseseesection3.8fordetailedinstructions.
Figure4.1InitialOutputonPCScreen
********************************************************************************
RNGUP->U,RNGDN->D,OFFSET->O,CAL->C,SOURCE->R,SET->S,ADJUST->AFUNCTION->F,SWEEP->P,BURST->B,MOD->M,SYM->Y,LOGIC->L,WAVEFORM->WENCODER=>+=up,-=down,0=0%,1=10%,2=20%,3=30%,4=40%,5=50%,6=60%,7=70%,8=80%,9=90%,*=100%---------->PRESSENTERTOUPDATECURRENTREADOUT!<----------==========>CURRENT_READOUT:12.106KHz<==========FUNCTION:GENERALDUTY_CYCLE:NEUTRALDC_OFFSET:NEUTRALRANGE:20KHzLOGIC:TTL_5VWAVE_FORM:SINESOURCE:INTTRACKING_STATUS:NON-TRACKINGSETTING:COARSEENCODER_SETTING(%)=50>
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OPERATINGSTEPS&TROUBLESHOOTING
4.12TROUBLESHOOTINGGUIDE
IfyouexperienceproblemsoperatingyourMODEL4051,pleasereviewthetroubleshootingtipsinthissectionforsolutionstocommonproblemsbeforecontactingyourdealer.
PROBLEM:Asthepoweristurned“ON”someofthekeyswitchesaredisabledortheLCDdisplayactserratically.
-Staticcharges,prolongednon-operation,andimproperuseroperationoftheMODEL4051maycausethe
switchesorLCDscreentomalfunction.TocorrectthisproblempresstheADJUSTkey.Ifthemachinestilldoesnotrespond,resetthemachinebyusingapintoholddowntheResetbuttononthefrontofthe4051.
PROBLEM:ThelogicprobefunctionsimproperlyorwithonlythegreenLED(logiclow)flashing
-Forthelogicprobetofunctionproperly,thecorrecttypeandvoltagethresholdmustbeselected.MakesurethatTTL3.3VorTTL5.0VmodeisselectedfortestingTTLcircuitsandCMOSmodeforCMOScircuits.InCMOSmodethe“C-LEVEL”voltagelevelmustbeadjustedtobeequalorcomeclosetotheVddofthecircuitundertest.
PROBLEM:TheLCDScreenandtheLEDPowerlightfailstolightupwhenthepowerswitchisflippedtothe“ON”position.
-ChecktheACpowercordandmakesurethatitissecurely connectedtotheACpowerplugontheMODEL4051.
-CheckthefuseinthecompartmentoftheACreceptacle.
PROBLEM:ThereisnooutputsignalfromthemainandTTL/CMOSoutputports
-ChecktheMODEL4051toseeifitisinLowFrequencyCounter,FrequencyCounter,orTotalizeCountermode.Whenthe4051isinoneofthecountermodes,theoutputsignaltotheTTL/CMOSandmainoutputisdisabledasaresultofcircuitsharing.
PROBLEM:Thepowersupplyvoltagedropsasloadingisaddedtoit.
-Eachpowersupplyhasamaximumoutputcurrentlimit.Ifloadingexceedingit’smaximumoutputisaddedtoit,thesuppliedvoltagewilldrop.Pleaseseethetechnicalspecificationsformaximumoutputcurrentvalues.
PROBLEM:Theoutputfrequencyofthegeneratorappearstodrift.
-TheautomaticfrequencylockingfunctionalityisonlyactivewhentheMODEL4051issettoCoarseFrequencyorFineFrequencyadjustmentmode.Duringadjustments
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OPERATINGSTEPS&TROUBLESHOOTING
in“DUTYCYCLE”,“DCOFFSET”orVoltageAdjustmentmodefrequencydriftmayoccur.
PROBLEM:Adjustmentstothe“C-LEVEL”voltagefailstochangetheamplitudeoftheCMOSoutputsignalinanexternalscope.
-Makesurethat“CMOS”modeisselected.IfTTL5VorTTL3.3Vmodeisselected,pressthe“LOGIC”keyuntil“CMOS”modeisdisplayed.
PROBLEM:Whenthepoweristurned“ON”thedisplaylightsupforaveryshorttimethenturnsoff.
-Turnoffthemachineandremoveallloadsthatareconnectedtothetripleoutputsupply.Turnthepowerbackon.Iftheproblemstillexists,theremaybeashortinsidethecircuitboardoraconnectormaybeimproperlyconnected.
PROBLEM:Whenthepoweristurned“OFF”andthenquicklyturned“ON”again,theLEDpowerlightison,butthedisplayremainsoff.
-Turnoffthemachineandleaveitoffforafewsecondsbeforeturningitonagain.TheswitchingpowersupplyoftheMODEL4051requiresmoretimetodischargewhennoloadisconnected.
PROBLEM:ThemodeisstuckonLowFrequencyCounterMode(EXTCNTRTOTAL)aftertheFUNCTIONKeyispressedandallthekeysaredisabled.
-TheremaybeanexternalsignalconnectedtotheEXT.COUNTERInputJackortheLogicProbetip,causingacontinuousinterrupttothemachine.DisconnectbothoftheseinputsandpresstheFUNCTIONkeyagain.
PROBLEM:Whenadjustingthefrequencyusingthedigitalencoder,thefrequencychangesinincrementalvalues.
-Thisisnormalbehavior.TheMODEL4051employsan8-bitdigitaltoanalogconvertertocontrolthe“COARSEFREQ”and“FINEFREQ”adjustments,dividingeachrangeinto256stepsofincrementalvalues.Eachadjustmenttothefrequencywillincreaseordecreasethefrequencybythevalueofonestepinsteadofacontinuousnumericalvalue.
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SPECIFICATIONS
SECTIONFIVE:SPECIFICATIONS
FUNCTIONGENERATOR:
FREQUENCYCHARACTERISTICS
Waveforms:Sine,Square,Triangle,±Pulse,±RampRange:0.15Hzto20MHzin8rangesResolution:0.01,0.1,1,10,100HzDisplayTuningRange:Coarse:10:1,Fine:±3%ofCoarseSettingVariableDutyCycle:15:85:15ContinuouslyvariableOperatingModes:Normal,Sweep,VCG,AM,FM,Single
Burst,MultipleBurstFrequencyStability:±0.2%ofthetuningfrequency
OUTPUTCHARACTERISTICS
Impedance:50ohm±10%Level:200mVto20Vp-pOpen-circuit,10Vp-pinto50ohmto10MHzAmplitudeControl:Variable,20dBrangetypicalDCOffset:Preset:±0.10Vtypical,Variable:±10Vopen-
circuit,±5Vinto50ohm
SineWaveDistortion:< 1.0%THDfrom10Hzto100KHzFlatness:±3%(0.3dB)0.15Hzto200KHz±5%(0.45dB)200KHzto10MHz±20%(2.0dB)10MHzto20MHz
SquareWaveSymmetry:<2%0.15Hzto100KHzRiseTime:≤20nsOvershoot&Undershoot:≤6%
TriangleWaveLinearity:98%upto100KHz
TTLOUTPUT(Open-CircuitConditionforFrequencies≤2MHz)Max.LogicLowLevelVoltage:≤0.4VMin.LogicHighLevelVoltage:≥2.6VRiseTime:≤15nsDutyCycle:50%typical
CMOSOUTPUT(Open-CircuitConditionforFrequencies≤2MHz)Level:Outputfrom3.0Vto15.0V±0.5Vp-pRiseTime:≤120ns
VCG(VoltageControlledGenerator)INPUTInputVoltage:0-10V±0.5Vcausesa10:1frequencychangeImpedance:10Kohm±5%
SWEEPOPERATIONMode:LIN/LOGSource:Internal,ExternalWidth:10:1,continuouslyvariableRate:10msto1sec,continuouslyvariableSweepOutput:0to2VStart/StopFrequency:Bydigitalsetting
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SPECIFICATIONS
AMMODULATIONCHARACTERISTICSSource:Internal,ExternalModulationRatio:5%to100%INT.Modulation:1KHzEXT.Modulation:DCto500KHzEXT.Sensitivity:Lessthan10Vp-pfor100%modulation
FMMODULATIONCHARACTERISTICSSource:Internal,ExternalDeviation:0to5%INT.Modulation:1KHzEXT.Modulation:DCto500KHzEXT.Sensitivity:Lessthan10Vp-pfor100%modulation
BURSTCHARACTERISTICSMode:Multiple,Single,orKeycontrolledoneshotSource:Internal,ExternalBurstWidth:Continuouslyvariablefrom5%to90%of
internalgatingfrequencyRepetitionRate:0.5Hzto50Hz,internalorDCto500KHz
externalBurstFrequency:Determinedbythemaingeneratorfrequency
setting.Toneburstisinintegralcyclesofgatedfrequency.
FREQUENCYCOUNTER(Displayshown“EXT.CNTR”)Range:3.0Hzto35MHzAuto-rangingResolution:0.01,0.1,1,10,100HzMax.Display:6digitsInputPort:LogicProbeorEXT.CNTRBNCJack
AUTO-RANGINGCOUNTERInputCharacteristics:Impedance:1MOHM/100pfCoupling:AC(Ext.counterBNCinput)/DC(logicprobeinput)Max.OverloadProtection:±260VAC/DCSensitivity:≤0.45VrmsAccuracy:Timebaseaccuracy±1count±triggerTriggeringThreshold:SelectableforTTL,CMOS,logicthreshold
or0-3.5Vcontinuouslyadjustabletriggeringlevel.
LOWFREQUENCYCOUNTER(Displayshown“EXT.CNTRTOTAL”)Range:0.04Hzto3HzResolution:0.01,0.001HzMax.Display:4 digitsInputPort:LogicProbeonly
TRANSITION(TOTALIZE)COUNTER(Displayshown“TOTAL”)FrequencyRange:upto5.0KHzMax.Display:6digitsResetKey:“CAL”InputPort:LogicProbeforDCcouplingorEXT.CNTRBNCJack
whenfrequencyisgreaterthan3Hz.
AUTO-RANGINGDVMInputRange:0to±2.500V,±25.00VDC,±250.0VAuto-ranging
Resolution:1mV,10mV,100mVAccuracy:±0.75%InputProtection:Max.±260VDC/ACImpedance:1MOHMMax.Display:4digits
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SPECIFICATIONS
UNIVERSALLOGICPROBE
LogicThreshold:
*VddiscontroledbyC-Level
MAX.RepetitiveFrequencyResponse:35MHz(WithprobeminiaturecliptoGND)
Min.SinglePulseDetection:15ns(WithprobeminiaturecliptoGND)
DisplayFormat:LogicHigh,LogicLow,Squareclock,PositiveGoingPulse,NegativeGoingPulse,Tri-state.
TRIPLEOUTPUTDCPOWERSUPPLY
Vcc +Vs -Vs
OutputVoltage 5V/3.3V 0~+24V 0~-24V
OutputCurrent Min. 5.0A 1.5A .5A*
Max. 6.5A 2.0A 1.5A*
DVMdisplay 3-digit 4-digit 4-digit
OverloadProtection ShortCircuit,Over-current,Over-voltage,ReversePolarity,Over-temperature
Ripple&Noise 10mVrms 10mVrms 10mVrms
DualTracking** N/A YES YES
*Forcontinuousoperation,theoutputcurrentof-Vssupplyreducesasoutputvoltagedrops.(see3.14forlimitationsofthe-Vssupply)
**-Vstracks+Vsorindependentadjustment
PHYSICALPROPERTIES:Dimensions:53”x9.5”x10.5”ShippingWeight:7.5lbs(3.4Kg)PowerRequirements:115VACor230VAC10%50Hzor
60Hz,ApproximatelyAccessories:Operationalmanual,ACpowercord,BNCcable
withclips,LogicProbeOptions:
1)RS-232CD-sub9-pinMaletoFemaleinterfacecable2)UniversalSolderlessBreadboardKitwithBananaPlugs(connectstoMODEL4051directly)
TTL CMOS
HighThreshold 2.0V±10% 70%Vdd*±15%
LowThreshold 0.8V±10% 30%Vdd*±15%
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PANELDIAGRAMS
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PANELDIAGRAMS:MODEL4051MULTIFUNCTIONGENERATOR
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PANELDIAGRAMS
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CALKey:Resetsthefunctiongeneratorto50%dutycycleandDCoffsettozero.Controls“Tracking”adjustmentmodeforPositive(+Vs)andNegative(-Vs)PowerSupply.Recallsdatasettingfromprogrammemory.
SOURCEKey:Selectsinternalorexternalcontrolsignalforsweep,burst,andmodulationfunctions.Alsoaccessesprogrammemory.
SWEEPKey:Selects“linear”or“logarithm”frequencysweepingmodes.
BURSTKey:Selects“Single”or“Multiple”burstfortheoutputsignal.
MODKey:Select“Frequency”modulationor“Amplitude”modulationmode.
SETKey:TurnsON/OFFthebacklightoftheLCDdisplay,asthefunctiongeneratorissetintoSweep,Burst,orModulationfunctionmode,thiskeyprovidesthecapabilitytostrobeeachstepandquantityduringsetupprocess.Alsostorescurrentsettingtoprogrammemory.
RNGUPKey:Increasetheoutputfrequencybyadecade.
RNGDNKey:Decreasesoutputfrequencybyadecade.
WAVEFORMKey:Selectsoutputsignal(Sine,Square,orTriangle.)
DigitalEncoder:Adjustsupto18differentquantities(displayedbybargraphic)foreachdesiredfunction.
AmplitudePot:Adjuststheamplitudeoftheoutputsignal.
SYMKey:EnablestheDutyCycleadjustmentfunction.
OFFSETKey:EnablestheDCOffsetadjustmentfunction.Alsostepsbackwardswhileinmulti-functionsequencemode.
LOGICKey:SelectstheLogicsignaloutputandthethresholdlevelofthelogicprobe,triggeringlevelofthecounter,andlogicpowersupplyintoTTL,5V,3.3VorCMOSlogic.
+Vs:Variablepositivesupplyoutputfrom0to+24V.(Note:NotAvailableonMODEL4050)
-Vs:Variablenegativesupplyoutputfrom0to–24V.(Note:NotAvailableonMODEL4050)
GND:Powersupplyandsystemgroundterminal.(Note:NotAvailableonMODEL4050)
+5V/3.3V:Logicsupply+5Vor+3.3Voutput.(Note:NotAvailableonMODEL4050)
FUNCTIONKey:ControlsFunctionandDisplay.Presstoadvanceonefunctionatatime.Uponenteringthismultifunctionsequence,theFUNCTIONkeywillstepforward,theOFFSETkeywillstepbackward,andtheADJUSTkeywillabortthesequence.
ADJUSTKey:SelecttheCoarseorFinefrequencyadjustmode,presstoabortanyotherfunctionandenterintofunctiongeneratorcoarsefrequencyadjustmode.ThemessagedisplayabovekeyindicatesthequantitybeingadjustedbytheDigitalEncode.
LCD:5”x1.5”LiquidCrystalDisplaywithCCFLBacklight.Messagesdisplayednexttocorrespondingkeysasfunctionsareenabled.Flashingmessagesindicatethequantitybeingadjustedbytheencoder.
LOGIC/DVMPROBE:Thefurnishedlogicprobeisconnectedhereforconvenientvoltage,frequencymeasurement,andlogiccircuitanalysis.
50OHMOutput:MainfunctiongeneratoroutputwithsuperimposedDCOffsetandDutyCycleadjustment.
TTL/CMOSOutput:ProvideslogicsignaloutputwithsamefrequencyandDutyCycleasthe50OHMOutput.
Ext.Counter:InputforexternalfrequencymeasurementwithACcouplingonly.
BurstInput:InputexternalgatingsignalforBurstoperation.
VCG/MODInput:InputexternalcontrolsignalforSweeporModulationoperation.
RS-232CSerialPort:Connectstocomputerforremoteoperation.
GCVOutput:GeneratorControlVoltageoutput.Voltageproportionaltogeneratorfrequency.
CoolingFan:TheMODEL4051’stemperaturesensitivecoolingsystemrespondsasinternalheatlevelsrise.Onthe4050,thecoolingfanoperatescontinuouslyaftertheunitisturnedon.
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ServiceInformationWarrantyService:Pleasereturntheproductintheoriginalpackagingwithproofofpurchasetothebelowaddress.Clearlystateinwritingtheperformanceproblemandreturnanyleads,probeandaccessoriesthatyouareusingwiththeservice.
Non-WarrantyService:Pleasereturntheproductintheoriginalpackagingtothebelowaddress.Clearlystateinwritingtheperformanceproblemandreturnanyleads,probeandaccessoriesthatyouareusingwiththedevice.Customersnotonanopenaccountmustincludepaymentintheformofamoneyorderorcreditcard.Forthemostcurrentrepairchargescontactthefactorybeforeshippingtheproduct.
ReturnallmerchandisetoBKPrecisionwithpre-paidshipping.Theflat-raterepairinclujdesreturnshippingtolocationsinNorthAmerica.Forovernightshipmentsandnon-NorthAmericashippingfeescontactBKPrecision.
Includewiththeinstrumentyourcompletereturnshippingaddress,contactname,phonenumberanddescriptionofproblem.
B+KPrecisionCorporation22820SaviRanchParkwayYorbaLinda,CA92887U.S.A.Phone:714.921.9095Fax:714.921.6422
OPERATINGMANUALB+KPRECISIONMODEL4051MUTLI-FUNCTIONTESTER
©2004B+KPrecisionCorporation
22820SaviRanchParkway,YorbaLinda,CA92887U.S.A.Phone:714.921.9095,Fax:714.921.6422Web:www.bkprecision.com
