pec电气工程英语证书考试-电气工程专有名词

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1、PEC电气工程英语证书考试-电气工程专有名词5导读：就爱阅读网友为您分享以下“PEC电气工程英语证书考试-电气工程专有名词5”资讯，希望对您有所帮助，感谢您对92to.com的支持!PEC电气工程专业英语证书考试-GlossaryofElectricalEngineeringTerms5ACSignal:Thetimevariantportionofavoltageorcurrent.AlternateSweep:Averticalmodeofoperationforadual-traceoscilloscope.Thesignalfromthesecondchanneli

2、sdisplayedafterthesignalfromthefirstchannel.Eachtracehasacompletetrace,andthedisplaycontinuestoalternate.ThismodeisusedforSEC/DIVsettingsoflessthan1ms/div(fasterthan1kHz).AlternatingCurrent(AC):Anelectriccurrentwhoseinstantaneousvalueanddirectionchangeperiodically.Thetermusuallyreferstosin

3、usoidallyshapedcurrentorvoltage11waves.Amplitude:Heightofawaveformaboveground(1/2peak-peakvalue)Attenuation:Thedecreaseinsignalamplitudeduringitstransmissionfromonepointtoanother.Bandwidth:Theoscilloscopefrequencyrangewithinwhichperformanceofaparticularcharacteristicfallswithinspecifiedlim

4、its,commonlydefinedasthedifferencebetweentheupperandlowerfrequencyatwhichtheresponseis.707(-3dB)oftheresponseatthereferencefrequency.Blanking:Theprocessofmakingthetrace,orpartsofatrace,invisible.Bypass:Acapacitorplacedfromadcsignaltogroundwillremoveanyaccomponentofthesignalbycreatinganacsh

5、ortcircuittoground.Calibration:Theprocessofcomparinganinstrumentordeviceagainstastandardtodetermineinstrumentaccuracyortomakeacorrection.Capacitance:Thepropertyofasystemofconductorstoanddielectricswhichenablesthesystemtostoreelectricitywhenavoltageisappliedbetweentheconductors,expressedasa

6、ratiooftheelectricalchargestoredandthevoltage11acrosstheconductors.ThebasicunitistheFarad.Capacitor:Adeviceconsistingoftwoconductingmaterialsseparatedbyaninsulatingmaterial(dielectric),whichcanstoreanelectricalchargewhenapotentialdifferenceexistsbetweenthetwoconductors.Cathode-ray-tube:Ane

7、lectron-beamtubeinwhichthebeamcanbefocusedtoasmallcross-sectiononaluminescentscreenandvariedinbothpositionandintensitytoproduceavisiblepattern.Chop:Averticalmodeofoperationfordual-traceoscilloscopesinwhichthedisplayisswitchedbetweenthetwochannelsatsomefixedrat