XITRON XT2640 - Confirming the DC Voltage Content of the Supply; Confirming the Voltage Distortion of the Supply; Confirming the Voltage Ripple Content of the Supply; Using the Xt2640 to Test Compliance to Loading Requirements

XT2640OperatingManual 13July2016 Page109of187
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1.
SelectthePOWERDATAscreenasshownabove.
2.
PresstheCLEARbutton.
3.
Waitforthedesiredperiodoftime(forexample2minutesforDO160E16.5.1.2).ThetimeanddatedisplayedontheXT2640
screenmaybeofassistanceindeterminingthetimeelapsed.
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voltageVpk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.
Note:
Itmayalsobeuseful(butnotrequired)toviewtheshort‐termmodulation;thisisperformedbyusingthePOWERDATA
screenasabovebutconfiguredtoshowtheCOUPLEDdataandshowingDETAILED.Inthesecondarydata(shownina
smaller,whitecoloredtext)forvoltageisameasurementresultentitledPk‐Vly.Thisisthemaximumpeak‐to‐valley
differencemeasuredandupdatedeachmeasurementperiod.BecausetheXT2640isconfiguredfora100msmeasurement
periodthisvaluewillfluctuateinresponsetomodulationatfrequencieswhicharenotamultipleof10Hz.
20.3.3 CONFIRMINGTHEDCVOLTAGECONTENT OF THESUPPLY
TheXT2640maybeusedtoconfirmthatthesupplyvoltageDCcontentisasrequiredforcertainoftheteststobeperformed.
ThisisperformedbyusingthePOWERDATAscreenwhichshouldbeselectedtodisplaytheresultsforeachchannel,showingthe
COUPLEDdata(sotheAC+DCortheDCdataisshownasconfiguredforthissupply),andshowingthefullDETAILEDinformation.
Inthesecondarydata(showninasmaller,whitecoloredtext)forvoltageisameasurementresultentitledDC.ThisistheDCcontent
ofthesupplyvoltagephasebeingviewed.
20.3.4 CONFIRMINGTHEVOLTAGE DISTORTIONOFTHESUPPLY
TheXT2640maybeusedtoconfirmthatthesupplyvoltagedistortioncontentisasrequiredforcertainoftheteststobeperformed.
Note:
AsdefinedinDO160E/F/G16.5.1.8.1.1thisisanimpossiblemeasurementtoperformasitrequiresthatthedistortionbe
measuredoveraninfinitenumberofharmonics.Inthismanualitisassumedthattherequirementactuallyintendedthat
thismeasurementbeperformedoverthesamenumberofharmonicsasdefinedforthecurrentdistortiontestsineach
requirement.
ThisisperformedbyusingthePOWERDATAscreenwhichshouldbeselectedtodisplaytheresultsforeachchannel,showingthe
FUNDAMENTALdata,andshowingthefullDETAILEDinformation.
Inthesecondarydata(showninasmaller,whitecoloredtext)forvoltageisameasurementresultentitledTHDf.Thisisthe
percentagedistortioncontentreferencedtothefundamentalcomponentofthesupplyvoltagephasebeingviewed.
20.3.5 CONFIRMINGTHEVOLTAGE RIPPLECONTENTOFTHESUPPLY
TheXT2640maybeusedtoconfirmthatthesupplyvoltageripplecontentisasrequiredforcertainoftheteststobeperformed.
Note:
Thebandwidthofthemeasurementmayhaveasevereimpactontheresultsobtained.Therequirementsdonotgenerally
stateanyspecificbandwidthforsuchameasurement,yetthisisameasurementofpeakvalueswhichareverydependenton
themeasurementbandwidthbydefinition.YoushouldaltertheMEASCONFIG‐BANDWIDTHsettingwhileperformingthese
teststoavaluetoprovideastandardizedbandwidthofthemeasurement–XiTRONrecommendsasettingof25kHzfor
BANDWIDTHforthesetests.
TheXT2640cannotconfirmthefrequencycontentofthemodulation.
ThisisperformedbyusingthePOWERDATAscreenwhichshouldbeselectedtodisplaytheresultsforeachchannel,showingthe
COUPLEDdata,andshowingthefullDETAILEDinformation.
Inthesecondarydata(showninasmaller,whitecoloredtext)forvoltagearemeasurementresultsentitledPk,onewithanuparrow
andtheotherwithadownarrow.Theseprovidethemeasurementofthehighestandlowestextentsoftheripple,thedifference
betweenthesetwomeasurementsisthepeak‐to‐peakripple.
20.4 USINGTHE XT2640TOTESTCOMPLIANCETOLOADINGREQUIREMENTS
TheXT2640canbeusedtomonitorthesupplytotheequipmenttoensurethatmostofthesetestsarebeingcarriedoutproperly
andalsosimultaneouslymakethedesiredloadcurrentmeasurements.
Ifyouwishtorecordthemeasurementsmade,thenitisrecommendedtoeither–
Saveagraphicalcopyofthescreen(s)toaUSBDrive(seesection21.5)
Or,exportallmeasurementresultstoaUSBDrive(seesection21.5)
Or,exportallharmonicsresultstoaUSBDrive(seesection21.5)
Or,exportallspectrumresultstoaUSBDrive(seesection21.5)
Or,exportthecycleviewresultstoaUSBDrive(seesection21.5)
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