XITRON XT2640 - Using the Numerical Listing

XT2640OperatingManual 13July2016 Page54of187


Thedisplayeddataiscontrolledbythebuttonsacrossthetopofthescreen(inorderfromlefttoright)‐
1. Selectwhichchannelisshownbyusingtheleftmostbutton.IfthisbuttoncolorsREDwhenpressedthenthisindicatesthatthe
presentlyselectedchannelistheonlychannelconfigured.
2. Selectwhethervoltage,current,wattsorinter‐phasevoltageharmonicsareshownbyusingtheVOLTS/AMPS/WATTSbutton.
ThisbuttonhasaVph‐phselectionforinter‐phasevoltageharmonicsavailableiftheselectedchannelisconfiguredfor
3p3w(3ch)or3p4wmeasurements.TheVph‐phselectionselectsthatthevoltageharmonicsoftheinter‐phasevoltagebetween
theselectedchannelandthenexthigherchannelintheVPAwillbeshown(thevoltagebetweenthelastandthefirstchannelis
shownifthelastchannelisselected).
3. SelectwhethertheselectedvoltageorcurrentharmonicsaretobecomparedagainstlimitsbytheLIMITSbutton.Seebelowfor
detailsregardingapplyingharmonicslimits.
4. Selecttheformatofthebarchartbyusingthefourthbutton.Youmayselectlinearlyorlogarithmicallyscaledbarcharts,either
showingabsolutedata,orrelativetothefundamental,orrelativetothetotalsignal.
5. Ifalogarithmicformatbarchartisselectedthenthefifthbuttonallowsyoutoselecthowmanydecadesareshown(1through
5).
Note:
Ifnoharmonicsareavailabletobeshownthenthebarchartisblank,therearenonumericallistingsontheleftside,and
NOHARMONICSAVAILABLEisshowninthechart.Typicallythisindicatesthatthesignalprovidingthefundamental
frequencymeasurement(theFUNDsettingintheMEASCONFIGscreenforthisVPA)isnotpresent,orthattheselected
channelisnotconfiguredforharmonicsmeasurements(seetheFUNDandHARMONICSsettingsintheMEASCONFIG
screenforthisVPA),oryouhaveselectedarelativechartandonlythefundamentalisavailable.
Ifthefrequencyisshowncoloredorangethentheharmonicsarenotlockedcloselyenoughtoallowaccuratemeasurement
ofallconfiguredharmonics.
Theactualnumberofharmonicbarsshownmaybelowerthantheconfiguredsettingduetothemaximumharmonic
frequencyconstraintsfortheselectedchannel(dependentonthechanneltype,theactualfundamentalfrequency,andthe
HARMONICSandBANDWIDTHsettingsontheMEASCONFIGscreenfortheselectedVPA).
Whenshowingwattsharmonicstheheightofthebarisindependentofthepolarity,thepolarityisshowninthenumeric
harmonicslistingtotheleftofthechart.
Whenshowinginter‐phasevoltageharmonics,phasedataisnotavailableinthenumericharmonicslistingtotheleftofthe
chart.
12.7.1 USINGTHENUMERICALLISTING
Thenumericallistingdowntheleftsideshowstheamplitudeandphase(phaseisnotavailableforallresults)forupto8selected
harmonics.
Eachharmonicislistedwiththeharmonicnumber,andalsothereisagoldcoloredbarunderthehorizontalaxisofthebarchart
showingwherethelistedharmonicsarelocatedonthebarchart.
Therearetwomethodswhichcanbeusedtoscrollthenumericallisting–
Usingthescrollup/downbuttonsaboveandbelowthelisting(thesebuttonsrepeatifheldpressed).
Or,pressinganywhereinthebarchart.Thispositionsthelistingintheharmonicsshownatthatpositiononthebarchart.
Youmayalsodragthelistinginthismanner.
Note:
TheamplitudedataisinVoltsorAmpsorWattsor%unitsassetbythetypeofbarchartselected.
Thephasedataisindegreeunitswith±180°rangeasfollows–
FundamentalVoltage:relativetotheVfundamentalinthelowestnumberedchanneloftheVPA
Non‐fundamentalVoltage:relativetotheVfundamentalinthischannel
FundamentalCurrent:relativetotheVfundamentalinthischannel
Non‐fundamentalCurrent:relativetotheAfundamentalinthischannel,exceptwhenconfiguredforEN61000‐3‐
12measurements,whenthe5
th
harmonicisthephaserelativetotheVfundamentalinthischannel