简介:1.IntroductionTheEMCdesignforthePrintedCircuitBoardhasbeenapopulartopic.Guidelinesandtipsforhigh-speedPCBdesignscouldbefoundfromnumerousresources.WheninvestigatingEMIissuesassociatedwithcircuitboards,manydetailssuchasclockfrequencies,switchingrates,rise/falltimes,signalharmonics,datatransferrates,impedances,traceloading,andtypesandvaluesofthevariouscircuitcomponents,shouldbetakenintoconsiderations.ThephysicallayoutofthePCboardanditsassociatedmetalliccomponentsareimportantconsiderations.Specialattentionshouldbegiventotheplacementandcharacteristicsofsignalsourcecomponents,vias,
简介:MostofelectronicsengineershaveexperiencedEMIrelatedissues.IthasbeenunderstandableandacceptabletocomplainabouttheEMIwhenwehavetroubledebuggingourcircuitsorequipment.Peopleliketotreatitasablackboxforthisisagoodexcusetostopusfrominvestigatingwhat'sgoingonbehindthephenomenon.However,thefactisthatwiththeadvancesinmodemmicroelectronics,ithasbeengettingmorechallengingthaneverforelectronicsengineerstoeliminateorreducetheEMIcausedbyhigherfrequencyandhigher-degreeintegration.
简介:1.IntroductionAnyoneworkinginasystemselectromagneticcompat-ibilityenvironmentisusuallypainfullyawareofthefactthat,often,theweakestlinkinthesystemisthecabling.Whetherthisisthecableortheconnectorsthemselves,ormorelikelytheinterfacebetweenthecableandtheconnectorswheretheremaybeapoorconnectionofthecablescreen,theabilityofcablingtoleakorabsorbspurioussignalsisacauseofmuchEMCfrustration.ThissectionwilladdressthebasisofthecablingrelatedEMIphenomenonandthebestcablingpractice.
简介:文章简要概述电磁感应电流试验原理及标准对接地开关开合电磁感应电流的特性要求,例举ZFl5—500型GIS的接地开关开合电磁感应电流的试验方法、试验线路、试验参数计算,以及试验结果分析。