电子专业英语教学课件作者高明辉第12章.ppt

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1、Warming-upI.HaveyoueverseentheinstrumentintheelectronicLaboratory?Unit12Oscilloscope下一页返回II.Doyouknowthemeaningofthefollomingphrases?1.troubleshouting2.cathode一rayoscilloscope3.deflectionplatesIII.TalkaboutCurrentinEnglash.Andthefollowingpatternsyoucanuse.Doyouk

2、nowwhatthefunctionofanoscilloscopeisCouldyoutellmethedifferenttypesofoscilloscopesCouldyoudescribethesize，weightandshapeofanoscilloscopeWhatarethemainpartsoftheoscilloscopeCouldyouexplaintheworkingprincipleofanoscilloscopeUnit12Oscilloscope上一页下一页返回TextComprehens

3、ionOscilloscopeThecathode-rayoscilloscopeisoneofthetnoslitnporlanlelectronicmeasuringinslrutnenls.Itiswidelyusedforresearchanddeveloptnenlintheelectronicindustry，suchasdesignwork，troubleshooting,signaltnoniloringandproduction-linetesting，andmanyotherapplications

4、wheretheob-servalionofanelectricalwavefortnisdesired.Theheartoftheoscilloscopeisthecathode-raytubewhichconsistsofthebase，neck(inwhichanelectrongunisincluded)，bulbandtheface一plate(screen).Theelectrongunconsistsofacalh-ode，whichetnilselectronswhenitishealed，acontr

5、olgrid，ananode，whichattractstheelectronbeamthroughit，andtwosetsofdelleclionplates.Onesetofdelleclionplatesisusedformovingtheelectronbeaminhorizontaldirection.Theothersetisusedtomovetheelectronbeaminverticaldi-reckon.Thebeam，starlingfromthecathode，passesThroughth

6、econtrolgridandtheanode，betweenthetwosetsofdeflectionplates，andstrikesthefaceofthecathode-raytube.Unit12Oscilloscope上一页下一页返回Unit12Oscilloscope上一页下一页返回MostoscilloscopesareACoperated，weigh40poundsormore，andusea5-inchscreen.Forapplicationswheresmallsize，lightweight

7、andportabilityarehighlydesirable，transistorizedoscilloscopearepreferredovervacuumtubetypes.Atransistorizedoscilloscopeweighsabouttenpoundsormore，operatesfromAClineorthebatteries，andusesa3-inchscreen.Oscilloscopesrangefromthegeneralpurposetypestothespecial-purpos

8、etypes.Theformerissuitableforpracticallyanyusualapplicationsinservicing，cotntnunicalions，scientificorindus-trialworkwheretheliequencyofthesignalobserveddoesnotexceed5