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EMC-1Dept.ofE.E.SJTUChp.1IntroductionofEMC1.1TheconceptofEMC（ElectromagneticCompatibility）•IECdefinition：EMCisakindfoequipmentfeature,whichmeansitcanworkproperlyinanEMenvironment,whilstitdoesnotemitun-permittedinterferencetootherdevicesoperatinginthesameEMenvironment.•通俗定义：EMC是和谐共存的电磁能量的发射和接收。•3essentialfactorsinEMC：EMIsource－transferorcouplingway－casualty1.2BriefHistoryofEMC•1920s,RFIbecamerealisticproblem；RFI&Powerequipmentrelationship。TCsareproposedinUS,aimedtodevelopmeasurementtech.，carryingoutpropertystandards.•1930s，someimportanttechnicalreportisprovided.Measurementtech.andinstrumentisimproved.Progress：Powertransmissionlineandradiostationproducedelectricfieldismeasured，limitationofradionoiseisfounded.•1934inEngland,>1000RFIcomplaintisinvestigatedandanalyzed.Powersources,Electrictraction,motors,switchesarefoundedasRFIsources.•IEC,IRAInternationalRadioAlliancefacedtotheproblem.CISPRisfoundedin1933.Thefirstmeetingisin1934.ResearchesareaimedatRFImeasurementmethodandacceptableupperlimit.After2～3years,160～1605kHzmeas.devicesarebasicallyaccepted.20％amplitudeturningdepth&1mV/mfieldreferenced&40dBsignal/noiseratiointerferencelimitisagreed.•Progress：USRFImeas.methodreport1940；CISPRtestreceiver,LISN,fieldconferenceproceedings；0.15~18MHzbandRFIandfieldmeasurement.Regulation；Measurement.ofRFInearPTL；160～1605HzbandRFImeasurement.&LISNoperatingregulation；RFIreceiverisdeveloped.DuringWorldWarIIandlater25ys•CISPRstoppedoperating•Militarypurposepushedcommunicationandradardevelopment.1940s,20MHz，1950s,30MHz，1960s,1GHz。MilitarySTDisimplementsinforce.Butsecretkeepingobstructtechnicalintercourse.•AfterWorldWarII,CISPRisveryactive，Canada、Australia&thenAsiancountriesjoined，CCIR（国际无线电咨询委员会）joinedalso，goestohigherfreq.andinmoredetail.RadioTV,PTL,residentialdevices,ISMdevicesareinvestigated.•FCC,Britishinst.ofIndustrialstandardizationpublishedinterferencecontrollimits.Progress•1945,U.S.navyandair-forcecommontechnical
