《电子信息专业英语》课件 Lesson 17 Oscilloscope

Lesson17oscilloscopeKeywords■radio收音机■button旋钮■input输入

■output输出■coupling耦合

■component元件■sensitivity灵敏度

■scan扫描■automatic自动

■measure测量■cable电缆■工作任务：如何利用示波器判断收音机的频率失真？■学习目标：掌握示波器的基本功能和使用方法，以及它在通信领域的应用。■重点难点：示波器在通信领域中的应用■推荐学时：6学时工作任务：Howtocalculatethefrequencydifferenceofaudiosignalsandoutputsignalsofradiousingtheoscilloscope?InputTurnonpowerToachievethegoal,youmaytrythefollowingtips.CheckandadjustmentbeforeusingoscilloscopeItisnecessarytomakeappropriatelyadjustmentwhenfirstusingoscilloscope.

SelectcouplingmodeSelectsensitivityofyaxisthebiggerwheelthesmallerwheelWeshouldselectpropersensitivityaccordingtopracticalsituation.SelectthesourceoftriggeringsignalsandpolaritySelectscanningspeedLikethesensitivity-selecting，weshouldselectappropriatesensitivityaccordingtopracticalsituation.thebiggerwheelthesmallerwheelInputmeasuredsignalFig-10

Asanalternative,"Chop"modecanbeusedtodisplaytwosignalsonthescreen.Chop-modeisonwhenboth,the"Dual"buttonandthe"Add"buttonarepressed.Example1：ChoosethesameY-positiontomakesurethewavesareatthesamereferenceline.

Example2：ToappropriatelyadapttheX-positiontomakesuregridsareatthestartingpointoftheperiod，soastoaccuratelycalculatethefrequencyoftheoutputsignals.Then，wewillgetthewaveslikethis：Definitely，ifyouthinktheimageisnotclear，youcouldachieveitthroughadjustingthe“FOCUS”.Questions1:whatisthemainfunctionoftheoscilloscope？2:Canyoubrieflysummarythetipsofmeasur