XITRON XT2640 - Testing the Load Current Modulation Meets Requirements; Testing the Load Power Factor Meets Requirements

XT2640OperatingManual 13July2016 Page111of187
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20.4.5 TESTINGTHELOAD CURRENT MODULATIONMEETSREQUIREMENTS
TheXT2640maybeusedtoconfirmthattheloadcurrentmodulationisasrequired.
Note:
Thebandwidthofthemeasurementmayhaveasevereimpactontheresultsobtained.YoumaywishtoaltertheMEAS
CONFIG‐BANDWIDTHsettingwhileperformingtheseteststoalowervalue(e.g.4kHz)toreducethebandwidthofthe
measurement.
ItisrequiredthatthisvaluebemeasuredovermanymeasurementperiodsoftheXT2640(sogivingaresultforlowfrequency
modulation)thisisachievedbyusingthePOWERDATAscreenconfiguredtoshoweachchannel,andINRUSHdata.
Tousethisscreenfollowtheproceduredescribedbelow–
1.
SelectthePOWERDATAscreenasshownabove.
2.
PresstheCLEARbutton.
3.
Waitforthedesiredperiodoftime(forexample1.5secondsforDO160F16.7.6).
4.
PresstheareashowingMEASUREMENTSRUNNING(thisiscalledtheMEASUREMENTINFOareainthismanual).Thisholdsall
measurementsenablingyoutoviewandrecorddatawithoutbeingconcernedaboutthetimetakentodoso.
5.
RecordtheindicatedcurrentApkandVlydata.Thedifferencebetweentheseisthedifferencebetweenthehighestpeakandthe
lowestvalleyencounteredduringtheperiodbetweenpressingtheCLEARbuttonandrecordingtheresult.
6.
Step2clearsthedataforallchannels,sofora3‐phasesupplyyoudonotneedtorepeattheentireprocedureforeachphaseif
allphasesarebeingmodulated.Justrepeatstep5,changingtheselectedchanneltorecordthemeasurementsforeachphase.
7.
Donotforgettoreleasethemeasurementholdafterrecordingallphases.
20.4.6 TESTINGTHELOADPOWERFACTORMEETSREQUIREMENTS
TheXT2640maybeusedtoconfirmthattheloadpowerfactorisasrequired.
ThisisperformedbyusingthePOWERDATAscreenwhichshouldbeselectedtodisplaytheresultsforentireVPA(i.e.theentire
supply),showingtheCOUPLEDdata,andshowingthefullDETAILEDinformation.
Forallpowerfactordata,iffollowedbyanupwardspointingarrowthepowerfactorisleading,otherwiseitislagging.
Theprimarydata(showninlarger,goldcoloredtext)forPFshowstheoverallpowerfactorfromthesupply(fora1‐phasesupply
thereisonlyasinglephase).
Thesecondarydata(showninasmaller,whitecoloredtext)forpowerfactorliststhepowerfactorfromeachphasefromthesupply
(fora1‐phasesupplythereisonlyasinglephase).
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