《电子信息专业英语》课件 Lesson 18 Signal generator

Lesson18SignalgeneratorKeywords■configure配置

■parameter参数■modulate调制

■carrier载波■instantanous瞬间的

■amplitude幅度■transmission传输

■channel调制■工作任务：如何产生高频连续信号，调制信号和扫描输出？■学习目标：掌握射频信号发生器的功能和基本操作■重点难点：射频信号发生器的基本操作■推荐学时：6学时工作任务：任务1：Configureawaveof700MHzand-20dbmwithN5181A/82AMXGGenerate

PresetthesignalgeneratorToreturnthesignalgeneratortoaknownstate,presseitherPresetorUserPreset.Presetisthefactorypreset;UserPresetisacustompreset.Toresetpersistentsettings(thoseunaffectedbypreset,userpreset,orpowercycle),Press:Utility>PowerOn/Preset>RestoreSystemDefaults.Wealsoshouldcaution：Toavoidthelossofdata,GPIBsettings,orcurrentuserinstrumentstatesthathavenotbeenpermanentlysavedtonon-volatilememory,theMXGshouldalwaysbepowereddowneitherviatheMXG'sfrontpanelpowerbuttonortheappropriateSCPIcommand.MXG'sinstalledinracksystemsandpowereddownwiththesystemrackpowerswitchratherthantheMXG'sfrontpanelswitchdisplayaError-310duetotheMXGnotbeingpowereddowncorrectly.Makethesignalgeneratordisplaythedesignatedfrequencyandminimumpowerlevel.SetRFfrequencyPressFreq>700>MHzstepbystep.InFrequencymode,thismenuisautomaticallydisplayedwhenenteringanumericvaluewiththefrontpanelkeypad.SettheRFamplitudePressAmptd>-20>dBmstepbystep.InAmplitudemode,thismenuisautomaticallydisplayedwhenenteringanumericvaluewiththefrontpanelkeypad.DBuVemfterminatesthevalueasdBuVelectromotiveforce.Emfistheoutputvoltagewithnoload.Thisunitisexternalonly.InternalrepresentationaswellasincrementanddecrementvaluesareindBm.Note:dBuV,mV,andnVemfbehavesimilarly(i.e.Valuesareexternalonly.InternalrepresentationaswellasincrementanddecrementvaluesareindBm.).TurnontheRFOutputPressRFOn/Off，

theRFoutputLEDlights,indicatingthatthesignalistransmittingfromtheRFoutputconnector.Here

任务2：GenerateanAMsignalGeneratePresetthesignalgeneratorSetthecarrierfrequencySettheRFamplitudeConfigurethemodulation1.PressAMSettheAMtype(LinearorExponential):AMTypetohighlightdesiredtype.SettheAMMode(NormalorDeep).DefaultisDeep.ToselectNormalenableMoretohighlightdesiredtype.SettheAMDepth:AMDepth>value（Default0.01%andrange0.01to100%）Settherate:AMRate>value>frequencyunitTurnonthemodulationPressAM>AMOffOn.TurnontheRFoutputTheRFoutputLEDlights,indicatingthatthesignalistransmittingfromtheRFoutputconnector.任务3：ConfiguringaSweptOutputThesignalgeneratorispowerful.Itcannotonlygeneratecontinuouswavesandmodulatedsignals，butalsoachievesweepingoutput.1.Setupeitherastepsweep(page52)oralistsweep(page58).2.IntheSweep/Listmenu,selectaparametertosweep:PressSweep>parameter>Return.3.Selectmanualmode:PressMore>ManualModeOffOn.Whenyouselectmanualmode,thecurrentsweeppointbecomestheselectedmanualpoint.4.Ifitisnotalreadyon,turntheRFoutputon:PressRFOn/Off.5.Selectthedesiredpointtooutput:PressManualPoint>number>Enter.Theprogressbarchangestoindicatetheselectedpoint.6.Usetheknoborarrowkeystomovefrompointtopoint.Asyouselecteachpoint,theRFoutputchangestothesettin