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1、PEC電氣工程專業(yè)英語證書考試電氣工程專業(yè)英語證書考試GlossaryofElectricalEngineeringTerms5ACSignal:Thetimevariantptionofavoltagecurrent.AlternateSweep:Averticalmodeofoperationfadualtraceoscilloscope.Thesignalfromthesecondchannelisdisplayedafterth

2、esignalfromthefirstchannel.Eachtracehasacompletetracethedisplaycontinuestoalternate.ThismodeisusedfSECDIVsettingsoflessthan1msdiv(fasterthan1kHz).AlternatingCurrent(AC):Anelectriccurrentwhoseinstantaneousvaluedirectionch

3、angeperiodically.Thetermusuallyreferstosinusoidallyshapedcurrentvoltagewaves.Amplitude:Heightofawavefmaboveground(12peakpeakvalue)Attenuation:Thedecreaseinsignalamplitudeduringitstransmissionfromonepointtoanother.Bwidth:

4、Theoscilloscopefrequencyrangewithinwhichperfmanceofaparticularacteristicfallswithinspecifiedlimitscommonlydefinedasthedifferencebetweentheupperlowerfrequencyatwhichtheresponseis.707(3dB)oftheresponseatthereferencefrequen

5、cy.Blanking:Theprocessofmakingthetracepartsofatraceinvisible.Bypass:Acapacitplacedfromadcsignaltogroundwillremoveanyaccomponentofthesignalbycreatinganacshtcircuittoground.Calibration:Theprocessofcomparinganinstrumentdevi

6、ceagainstastardtodetermineinstrumentaccuracytomakeacrection.Capacitance:Thepropertyofasystemofconductstodielectricswhichenablesthesystemtosteelectricitywhenavoltageisappliedbetweentheconductsexpressedasaratiooftheelectri

7、calgestedthevoltageacrosstheconducts.ThebasicunitistheFarad.Capacit:Adeviceconsistingoftwoconductingmaterialsseparatedbyaninsulatingmaterial(dielectric)whichcansteanelectricalgewhenapotentialdifferenceexistsbetweenthetwo

8、conducts.Cathoderaytube:Anelectronbeamtubeinwhichthebeamcanbefocusedtoasmallcrosssectiononaluminescentscreenvariedinbothpositionintensitytoproduceavisiblepercentages.Farad“Unitofmeasureofcapacitance.NamedafterFarad.Feedb

9、ack:Voltagefromtheoutputofacircuitischanneled(“fed“)backintotheinputofthecircuit.Focus:TheoscilloscopecontrolthatconvergestheCRTelectronbeamstoproduceasharpdisplay.FreerunningTrace:Atracethatisdisplayedwithoutbeingtrigge

10、redeitherwithwithoutanappliedsignal.Frequency:Theinverseoftime(1seconds).Howoftenaneventoccurswithinasecond.Graticule:TheCRTgridlinesthatfacilitatethelocationmeasurementofoscilloscopetraces.Ground:1.Aconductingconnection

11、thatbywhichanelectriccircuitequipmentisconnectedtotheearthtoestablishmaintainareferencepotentiallevel.2.Thevoltagereferencepointinacircuit.Hertz:Unitoffrequencyonecyclepersecond.Hysteresis:AnoutputvoltageVccdoesnotchange

12、toVccuntiltheinputincreasesaboveBVccBbeingaconstantvalue.ConverselyVccdoesnotchangetoVccuntiltheinputdecreasesbelowBVcc.Impedance:Thetotalapparentoppositionacircuitofferstotheflowofalternatingcurrentinanelectricalcircuit

13、.Inductance:Thevoltageacrossaninductisdirectlyproptionaltotherateofchangeofthecurrentthroughitdividedbytherateofchangeoftime(differencecurrentdifferencetime=didt).TheproptionalityconstantwhichmakesthistrueisLtheinductanc

14、eoftheinductcomponent.ItisdenotedbyLitsunitsaretheHenry(H).Therefethevoltagevacrossaninductisgivenbyv=L(didt).Induct:Circuitelementwhichisaconductwrappedintoacoiltocreateamagicfield.LED:LightEmittingDiodeemitslightwhencu

15、rrentispassedthroughit.Megahertz(MHz):AfrequencyofonemillionHertz106cyclespersecond.Microphone(Condenser):Anelectromechanicaltransducerthatconvertssoundpressureintoanelectricalsignal.Condensermicsrequirepowertogeacapacit

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