XITRON XT2640 - Performing En50564 Low Power Measurements; VPA Measurement Configuration for EN50564:2011 Measurements

XT2640OperatingManual 13July2016 Page82of187
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17 PERFORMINGEN50564LOWPOWERMEASUREMENTS
TheSTBYPOWERScreengivesyoutheabilitytoconfigure,start/stop,andviewtheresultsoflowpowermeasurementsin
accordancewithEN50564:2011.
ItisassumedinthissectionthatyouareconversantwiththegeneraloperatingmethodsusedintheXT2640asdescribedinsection
12.
TheSTBYPOWERscreencanbeselectedforviewfromanyoftheMainDataScreensbypressingtheSTBYPOWERbutton.
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TheXT2640hastheabilitytoperformlowpowermeasurementsindependentlyineachVPA,soasingleXT2640canperformupto3
independentlowpowermeasurements.YouselectwhichVPAisbeingconfigured,controlledandviewedbyusingtheVPAbutton
(theleftmostacrossthetopofthescreen).
TheXT2640performsthelowpowermeasurementinaccordancewithEN50564:2011para.5.3.2,whichistherecommended
methodforalllowpowermeasurements.
IfyoupreferameasurementaccordingtoEN50564:2011para.5.3.3(“Averagereadingmethod”)or5.3.4(“Directmeterreading
method”)thenthesecanbeaccommodatedusingthePOWERDATAscreenwiththeVPAproperlyconfiguredand(asneeded)using
theIntegrationcapabilitiesoftheXT2640describedelsewhereinthisdocument.TheSTBYPOWERscreenshouldgenerallynotbe
usedforthesemethods,butyoushouldnotethatthemethodemployedintheSTBYPOWERscreentoEN50564:20115.3.2is“th e
recommendedapproach”and“shouldalwaysbeusedifthereisanydoubtregardingthebehavioroftheproductorstabilityofthe
mode”.
Note:
Theword“sampling”inEN50564:2011relatestosamplingoftheindividualmeasurementperiodresultsoftheXT2640,
nottothesamplingofthesignalsusedtoperformeachsuchmeasurement.
17.1.1 VPAMEASUREMENTCONFIGURATIONFOREN50564:2011MEASUREMENTS
TherearesomesettingsintheMEASCONFIGscreenwhichtheusershouldensureareappropriateforperformingEN50564:2011
compliantmeasurements.ThesearenotenforcedbytheXT2640toallowyoumoreflexibilityinusingthistypeofmeasurement.
AllsettingsontheMEASCONFIGscreenwhicharenotlistedheredonotaffecthowlowpowermeasurementsareperformedto
EN50564:2011.
Note:
TheRESPONSEconfigurationsettingfortheVPAisnotappliedtotheSTBYPOWERresults.
TheCOUPLINGconfigurationsettingfortheVPAisnotappliedtotheSTBYPOWERresults(allSTBYPOWERresultsuse
AC+DCcouplingasrequiredbyEN50564:2011).
AlthoughallowedbytheXT2640,itisnotrecommendedtoreconfigureaVPAduringalowpowermeasurement.
TheMEASCONFIGscreenshownbelowgivesanexampleofafullyEN50564:2011compliantconfigurationoftheXT2640whenthe
powersourceandloadareconnectedviaaLPA‐1accessory.