《电子信息专业英语》课件 Lesson 16 The use of multimeter

UnitFive■主要内容：常用电子类仪器仪表使用说明。■学习目标：了解常用电子类仪器仪表的功能，掌握各种仪器的使用方法。■素质目标：脚踏实地，勇于实践，学以致用、不断创新；传承匠心精神、践行树人品格，增强科技强国意识及社会责任感。Lesson16TheuseofmultimeterKeywords■multimeter万用表

■physically物理地■mode模式

■probe探测■display显示屏

■upperlight高亮■nominal额定的

■over-range超量程■drift漂流

■工作任务：如何检测键盘是否串建？如何测试常用电池的电压？■学习目标：掌握万用表的功能和使用方法，以及在日常生活和电路检测中的应用。■重点难点：万用表在电路检测中的应用■推荐学时：6学时工作任务：任务1：Howtodetectwhetherthekey“w”andthekey“e”arephysicallyconnectedwithamultimeter?GetintothemodeTouchandgoExample1:Thismeterisverysimple.Whentheprobesarenottouching,thedisplayshows"1",Whenyoutouchthetipstogether,thedisplaychangestoathreedigitmode(it'sdisplayingresistance,whichwewillcoverlater)Italsoemitsabeep.Example2:Thismeterisdual-modebutstillveryeasytouse.Turnthedialtothesymbol.Whentheprobesarenottouchingthedisplayshows"OL"whichstandsforOpenLoop.Whenyoutouchtheprobes,thesoundwaveiconshowsupinthedisplay(upperright)anditalsoshowsanumber.Thenumberisnottheresistance,actuallyit’sthevoltage.ProbingaPCBExample:HereisanexampleoftestingaPCBforcontinuity.Thefirsttestshowsthatthetwopointsarenotconnected;thesecondtestshowsthatthesetwopointsareconnected.任务2：Howtomeasurethevoltageofdailybatterieswithamultimeter?VoltagetestingExample1:Thefirstbatterywe'lltestisanew1.5Valkaline.ThisoneisaAAAbutaAA,CorDcellwillbethesamevoltage.Settherangeto2VDC.Example2:Wemeasurea9Valkalinebattery.Ifwestillhavetherangesetto2VDCwewillgetamysterious"1"display,indicatingisitover-range.Questions1:Howtoselectanappropriatemeasuringrange?2:Couldyouexchangetheblackprobeandtheredprobewhe