>> P.8
ReasonswhyESPECElectrochemicalMigrationEvaluationSystemsarechosenworldwideHybridmeasurementusingscanner-typehigh-accuracymeasurementandeventdetectorsWhatisscanner-typehigh-accuracymeasurement?■Thisisameasurementdevice(150ch/device)thatconformstointernationalstandardsmeasuresallsamples,reducingvariationinmeasuredvaluesamongdifferentchannels.ItisequippedwithanNPLC(NumberofPowerLineCycle)functionthatreducestheeffectsofprimary-sidepowernoiseandallowshigher-accuracymeasurement.Whatiseventdetectors?■Adetectioncircuitisinstalledforeachchannelinordertodetectmomentarymigrationthatcannotbecapturedbythemeasurementdevice.(Thedetectionspeedislessthan100μs.)Initialmigrationisashort-circuitphenomenoninwhichthedendriteburnsoutandtheoriginalresistancevalueisrestored.TheESPECeventdetectorsperformscontinuousmonitoringinordertoavoidoverlookingthis.*Migrationoccursgraduallyoveraperiodofseveraltensofhours.(IPCstandard:Measurementinterval20minorless)TestvoltagetosuittheindividualsampleBoardinsulationevaluation(Teststandard:IPC-TM-6502.6.3.3)Capacitorinsulationevaluation(Teststandard:AEC-Q200)Appliedstressvoltage:50VDCMeasurementvoltage:100VDC(voltagecharge60sec→measurement)Measurementpoint(aftercharge)100V50VWaitbeforemeasurement:0minChargetime(measurementvoltage100V)60secWaitaftermeasurement:0minAppliedstressvoltage:30VDCMeasurementvoltage:15VDC(0Vdischarge1min→voltagecharge60sec→measurement)30V15V0VMeasurementpoint(aftercharge)Chargetime(measurementvoltage15V)60secActualoutputcontrolwaveformacquiredwithanoscilloscopeActualoutputcontrolwaveformacquiredwithanoscilloscopeWaitbeforemeasurement:1minWaitaftermeasurement:1min30V15V0VRisingwaveformFallingwaveformWaveformbeforemeasurementWaveformaftermeasurement0V100V50V0V7
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