Rigol DG1022 User Manual download pdf (Page 5)

waveformgeneratorisequalto50ohms.Forthewaveformgeneratortooutputawaveformwiththe

correctamplitudeacrosstheloadZ

,weneedtoenterthevalueofZ

intothesignalgenerator.



IftheinputimpedanceoftheDUT,isveryhigh(infinity)thenweshouldenteravalueof“HighZ”

(infiniteimpedance)intothewaveformgenerator.Notethatinourlabwewillsettheinput

impedanceoftheoscilloscopeto20MegaOhmswhichforallpracticalpurposescanbeconsideredto

beinfiniteimpedance.Thereforewewillalwayssetthesignalgeneratorto“HighZ”whenweconnect

ittoanoscilloscope.Mostdevicesweconnecttothesignalgeneratorinourlabswillhaveinfiniteinput

impedances.

IftheinputimpedanceoftheDUTequals50Ohmsthenweshouldenteravalueof50Ohmsintothe

signalgenerator.

ToenterthevalueoftheinputimpedancegothroughModes/Functions:Utility‐>CH1(orCH2).You

canselect“HighZ”,50OhmsorentertheappropriatevalueoftheimpedanceoftheDUT.Defaultis

“HighZ”.



AMmodulation

Amplitudemodulationiswidelyusedinthefieldofcommunications(thistopicwillbecoveredinclass

lectures).

TogenerateanAMmodulationsignalweneedacarriersinusoid



cos



.Thesignaltobe

modulatedwillvarytheamplitudeofthecarriersinusoidproportionaltoitsamplitude.Ifthesignaltobe

modulatedis



cos



,thentheAMmodulatedsignalisdefinedas

 

1cos cos

100

sc c

depth

tA t











where

depth

isinunitsof%.

MakesurethatnoneofthebuttonsinMode/Functionsgroupislitup.Setupthecarrierfrequency

followingnormalproceduresforsettingupwaveforms.ThenpressModbuttoninMode/Functions

group.TheLCDscreenwillgiveyouoptionsforType,SrcExt/SrcInt,Depth,AMFreqandShape.

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Rigol DG1022 User Manual Page 5

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