RC电路的过渡过程.doc

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1、Experiment4TransientProcessofRCCircuitIObjectives1.ToLearntouseoscilloscope.2.Tostudythesquarewaveresponsesoffirst-ordercircuits.IIApparatusandEquipmentsNameSpec.Number1Two-channeloscilloscopeXJ432812FunctiongeneratorEE1641D13ElementsR=510Ω,1kΩ,2kΩ,3kΩ,10kΩC=0.1μf,0.3μf

2、,0.4μf,1μf,3μf,10μf1IIIPreperations1.TherectangularpulseresponsesofaRCcircuitFig.4-1andFig.4-2aretherectangularpulsesandaRCcircuitrespectively.Fig.4-1RectangularpulsesFig.4-2RCcircuitSupplythesignalofrectangularpulsestotheRCcircuit,wegettheresponsesshowninFig.4-3ifthein

3、itialvalueofuCiszero.Obviously,RCcircuitchargesanddischargescontinuously.It’stheessenceofpulseresponsesofRCcircuit.2.ApplicationsofaRCcircuit(1)DifferentialcircuitinFig.4-4——whentheparametersRandCmakethetimeconstantτ<

4、sponseμRshowninFig.4-5.(2)IntegralcircuitinFig.4-6——whentheparametersRandCmakethetimeconstantofthecircuitτ>>tp,wecangettheresponseuCshowninFig.4-7.TheoutputvoltageuCisapproximatelytheintegrationoftheinputvoltageui.Fig.4-3Fig.4-4RCdifferentialcircuitFig.4-5Responseofthec

5、ircuitFig.4-4Fig.4-6RCintegralcircuitFig.4-7ResponseofthecircuitFig.4-6IVLabWork1.Measurethepeakvaluesandperiodsofsinusoidsproducedbyafunctiongenerator.2.Measurethemagnitude,periods,andpulsewidthofsquarewavesproducedbyafunctiongenerator.3.Measurethephasedifferenceoftwos

6、inusoids.Supplythesinusoidui(f=1kHz,Up-p=1V)tothecircuitFig.4-4,observethevoltageuianduRwithoscilloscope,measurethephasedifferenceofthem,andcomparethemagnitudesofthem.Theparametersarelistedasfollow:(1)R=1kΩ,C=0.1μf;(2)R=1kΩ,C=0.2μf;(3)R=2kΩ,C=0.1μf;(4)R=1kΩ,C=10μf.4.Stu

7、dythetransientprocessofaRCcircuitSupplyasquare-wavesignal(amplitude4V,periods4ms,andpulsewidthtwabout4ms)tothecircuitFig.4-6.(1)ObservethewaveformsofuR,uC,anduiinthecaseτ=RC<;(2)ObservethewaveformsofuianduCsimultaneouslyinthecaseτ=RC=(;(3)Observethewaveformsofuian

8、duCsimultaneouslyinthecaseτ=RC>;(4)Observethewaveformsofui,uC,anduRsimultaneouslyinthecaseτ=RC>;VPreparation