XITRON XT2640 - Integrated Data; Data Logging

XT2640OperatingManual 13July2016 Page163of187
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ACvoltagesandcurrentsarecomputedfromtheDCandAC+DCRMSmeasurementresultsusingthefactthat(AC+DC)
2
=
(AC)
2
+(DC)
2
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DCWattsforachanneliscomputedfromthemultiplicationoftheDCvoltageandcurrent(andisidenticaltoDCVA).
ACWattsforachanneliscomputedusingthefactthatW(AC+DC)=W(DC)+W(AC)
VAforachanneliscomputedfromthemultiplicationoftheappropriatevoltageandcurrentdata.
PF(forachannelorforaVPA)iscomputedusingthefactthatPF=W/VA.
VARforachanneliscomputedusingthefactthatVA
2
=W
2
+VAR
2
withthepolarityoftheresultantVARsetaccordingto
theconfiguredlead/laginformation.
VPAtotalWattsiscomputedfromthesumoftheWattsforthechannelsintheVPA
VPAtotalVARandVAiscomputedaccordingtothemethodselectedintheconfigurationforthatVPA.
VPAoveralllead/lagistakenfromthepolarityofthesumofthechannelVARfortheVPA.
ThetotalWattsforanefficiencygroupisthesumoftheVPAtotalWattsforeachVPAconfiguredbytheEFF/LOSSsetting
tobeintherequestedgroup.
25.7 INTEGRATEDDATA
AttheendofeverymeasurementperiodinanyVPA,allintegratedresultsareaccumulatedwiththeproductoftheresultandthe
entiremeasurementperiodtime(ifintegrationwasneitherstartednorstoppedduringit)orapartialmeasurementperiodtime(if
integrationwasstartedand/orstoppedduringit).
25.8 DATALOGGING
Whiledataloggingisrunningtheconfigureddataisobtainedfromthe‘datacollection’blockandissavedintoalargebufferFIFO.
TheoutputofthisFIFOisformattedasneededandwrittentotheUSBDriveifpossible.
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