XITRON XT2640 - Page 48

XT2640OperatingManual 13July2016 Page48of187
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CAUTION:IfVand/orAsignalshaveRMSvalueswhicharebeyondthemeasurementcapabilityofthechannelthenthe
respectiveprimarydataiscoloredred.Youshouldensurethatthesignalsarewithinthecapabilitiesofthechanneland
shouldreducethesignallevelsassoonaspossibleotherwisethechannelmaybedamaged.
Whetherthecurrentisleadingorlaggingthevoltagecanbedeterminedbythedirectionofanarrowshownimmediatelyafterany
PFdatashown.Ifthearrowispointingupwardsthenthecurrentisleading,ifdownwardsthenitislagging.
TheWatts,VA,VAR,PF,VoltsandAmpsresultsaregroupedwiththeirrespectivesecondaryresults.
Thesecondaryresultsareshowninasmallerfontandarecoloredwhiteandthesemaybedisabledorenabledbypressing
theDETAILED/BASICButton.Theseincludetheresultsforcouplingsotherthanthatconfigured(fortheexampleabove,
AC+DCisconfiguredastheCOUPLINGsothesecondaryresultsshowtheDCandACdata).DCPFisnevershown.
ForCOUPLEDorRECTIFIEDdatathevoltageandcurrentgroupsecondarydataalsoshowsthemostpositiveandmost
negativepeakexcursions,thedifferencebetweenthehighestandlowesthalf‐cyclepeaks,andthecrestfactors(for
COUPLED)orformfactors(forRECTIFIED).
Ifthesignalshavepeakswhicharebeyondthemeasurementcapabilityofthechannelthentherespectivepeak
dataiscoloredred.Thisshouldnotnecessarilybetakenasacauseforconcern,particularlyifonlytemporary;it
merelyindicatesthatthedisplayedresultsmaynotbefullyaccurateastheyinclude‘clipped’signals.
Half‐cyclepeakdataisnotshownifthefundamentalfrequencycannotbeestablishedorthereare2orlesscycles
ofthesignalinameasurementperiod.
ForFUNDAMENTALdatathevoltageandcurrentgroupsecondarydataalsoshowsthedistortionincludingallconfigured
harmonicsasapercentagerelativetothefundamental.
ThePHSdatainthePFgroupsecondarydataistheinversecosineofthePFdatawiththepolaritysetfromthelead/lag
determination.
Thefrequencyshown(ifany)isthefundamentalfrequencyobtainedforthischannel,fromthesourceconfiguredbytheFUND
settingintheMEASCONFIGscreenforthischannel.
IfMEASURINGisshownforfrequencywithnoothermeasurementresults,thenthisindicatesthatthefirstmeasurementis
beingmadewithanewconfiguration.Thisistemporary(unlessmeasurementsareheld);assoonasthefirstmeasurement
resultsareavailabletheywillbeshown.
IfNOFUNDAMENTALisshownforfrequency,thenthisindicatesthatthesignalprovidingthefundamentalfrequency
measurement(theFUNDsettingintheMEASCONFIGscreenforthischannel)iseithernotpresentorhasnotbeen
measuredyetfollowingachangetothemeasurementconfiguration.
IfconfiguredforLForVLFmeasurements(bytheLF/PERIODsettingintheMEASCONFIGscreenforthischannel)thena
measurementprogressbarisincludedinthelowerrightcornerofthedatawindow.
12.5.1 .2 INRUSHDATA
ThisisviewedbyselectingtheINRUSHselectionintheDataSelectButton.
ThisscreenshowsthehighestACDCWatts,highestACDCVolts,highestPeakVolts(largestexcursionfromzero),lowestvalleypeak
Volts(thelowestexcursionfromzeroofthepeakinanyhalfcycle),highestACDCAmps,highestPeakAmps(largestexcursionfrom
zero)andthelowestvalleypeakAmps(thelowestexcursionfromzeroofthepeakinanyhalfcycle).
Note:
ThemeasurementsobtainedforinrusharenotaffectedbytheRESPONSEsettingfortheVPA.
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ThedatashownonthisscreenisresetbypressingtheCLEARbutton.
Seesection14forfulldetailsregardingusingthisscreentomakeInrushmeasurements.
12.5.1 .3 LOADDATA
ThisisviewedbyselectingtheLOAD,LOAD(LR)orLOAD(CR)selectionsintheDataSelectButton.IftheCOUPLINGconfiguration
settingfortheVPAcontainingthischannelissettoDCthenonlytheLOADselectionisavailable,otherwiseonlytheLOAD(CR)and
LOAD(LR)selectionsareavailable.
ThisscreenshowstheloadimpedanceforLOAD,bestfitseriesresistance/inductanceforLOAD(LR),orthebestfitparallel
resistance/capacitanceforLOAD(CR).