XITRON XT2640 - Low Power Measurement Configuration

XT2640OperatingManual 13July2016 Page83of187
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17.1.1.1 RECOMMENDEDLF/PERIODSETTING
TheXT2640performsone“sample”everymeasurementperiod,sotostrictlyaccommodatetherequirementofEN50564:2011para.
5.3.2thattheremustbeatleastonesamplepersecondtheVPAmustbeconfiguredforaLF/PERIODsettingofeither10Hz/0.3s,
20Hz/0.1sor45Hz/20ms.
Recommendation:
Generally,the20Hz/0.1ssettingisrecommendedforLF/PERIODwhichexceedstherequirementbyafactorof10:1;
howeverforshorterlowpowermeasurements,orwheretheloadisknowntohavefastexcursionsinpower,the
45Hz/20mssettingshouldbeconsidered.
17.1.1.2 RECOMMENDEDFUNDSETTIN G
EN50564measurementsarenormallyperformedonmainspower.
Recommendation:
Generally,theMAINSsettingforFUNDisrecommended.
17.1.1.3 RECOMMENDEDBANDWID THSETTING
EN50564:2011para.4.4.2requiresthatpowermeasurementbemadewith“afrequencyresponseexceeding2KHz”.
Recommendation:
Generally,theAUTO‐TRACKsettingforBANDWIDTHisrecommendedwhichfullymeetsthisrequirement.
17.1.1.4 RECOMMENDEDHARMONICSSE TTING
EN50564:2011para.4.3.2requireslimitsontheTHDofthevoltagesourceandrequiresthatthisTHDshallbecomputedusingupto
andincludingthe13
th
harmonic.
Recommendation:
Thesettingshouldbeatleast13forHARMONICS.
Note:
ThereportedvoltageTHDontheSTBYPOWERscreenonlyincludesuptothe13
th
harmonicnomatterwhatHARMONICS
issettoaslongasitissettoatleast13.
17.1.1.5 RECOMMENDEDADJUSTSETTING
EN50564:2011AppendixDrequiresthattheerrorintroducedbytheshuntbeaccountedforinthetotalerrorfiguresorbe
otherwisecompensatedfor.EN50564:2011AppendixBdiscussestwomethodsofconnectingthepoweranalyzerandtheload.
Recommendation:
Itisrecommendedthatthe“
LowerPowerLoads”connectionsdescribedinEN50564:2011B.4.2(whichisthemethodwhen
usingaccessoryLPA‐1)isused.UseasettingofLOAD(V@SRCE)forADJUSTtocompensateforthiswiringmethod.
Thesmallinaccuracyofthecompensationisincludedinthereportederrorfigure.
17.1.2 LOWPOWERMEASUREMENTCONFIGURATION
ThelowpowermeasurementitselfisconfiguredbypressingtheCONFIGUREbuttonontheSTBYPOWERscreen.