XITRON XT2640 - Page 84

XT2640OperatingManual 13July2016 Page84of187
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17.1.2.1 SETTINGTHEEN50564:2011METHOD
TheXT2640canperformtwotypesofmeasurementasdefinedbyEN50564:2011para.5.3.2.ThesearesetasEN505645.3.2aand
5.3.2dfortheMETHODsettingandrelatetothefirstandfourthmethodsdescribedinEN50564:2011para.5.3.2respectively,i.e.the
methodsformeasuring“
powerconsumptionwithinamodeisnotcyclic…”(5.3.2a)and“Modesthatareknown(basedoninstructions
foruse,specificationsormeasurements)tobeoflimitedduration…
”(5.3.2d).
Note:
Theuseof“
notcyclic”inEN50564:2011canbeconfusing.Itdoesnotmeanthattheloaddoesnotvary;itsimplymeans
thatanyvariationdoesnothaveaknownandconstantfrequencyofvariation.
Recommendation:
Inalmostallcircumstancesthe5.3.2asettingshouldbeused.
17.1.2.2 SETTINGIFTOSIMULTANEOUSLYDATALOG 
TheDATALOGbuttonallowsyoutoselectiftheXT2640istoautomaticallystartandstopdataloggingwhenalowpower
measurementisstartedandstopped.
Recommendation:
Typicallythisisnotused,sothisissettoNO.
ForcorrectoperationwhensettoYESthedataloggingshouldalreadyhavebeenconfiguredtousemanualtiming(withno
delayandlessthana1secondinterval)andwiththedesireddatabeinglogged(atleasttheWattsresultisrecommended).
17.1.2.3 SETTINGTHETES TTIME (EN 50564:20115.3.2A)
IfyouselectedtheEN505645.3.2amethodthentheTESTTIMEsectionisshownonthescreenwithabuttonwhichallowsyoutoset
theminimumtesttimeforthemeasurement.
Note:
ForstrictcompliancetoEN50564:2011para.5.3.2thelowpowermeasurementshouldbeperformedforaminimumof15
minutesandshouldnotbecompleteduntiltheslopeobtainedbylinearregressionofthepowerduringthefinal2/3
rd
of
thetotalperiodislessthanthatallowedbyEN50564:2011.
Forconveniencewherestrictadherencetothestandardisnotrequired,theXT2640allowstheusertoconfigure
atotalperiodofotherthan15minutes.
TheXT2640willautomaticallyextendthetotalperiodiftheslopeduringthefinal2/3
rd
oftheelapsedtimedoes
notachievethemaximumrequiredandwillnotautomaticallystopthemeasurementuntilthisisachievedandthe
minimumperiodhasalsobeenachieved,butyoumaymanuallystopthemeasurementatanytime.
Ifthemeasurementisstoppedbytheuserratherthanautomaticallystoppedtotherequirementsof
EN50564:2011thisisshownbydenotingthatthemeasurementwas“STOPPED”ratherthan“COMPLETED”on
theXT2640screen.
InthedataentryscreensfortheTESTTIMEsettingtherearefourentries,oneforeachunitofdays,hours,minutesand
seconds.
Thescreenalwaysstartswiththedaysdataselected;youcanjumptoanyofthefourentriesdirectlybypressing
therespectivetimeentryarea.
Youcanenteranumericbetween0and99intoanyofthefourentries.Theactualtimeusedisthetotaltime
createdbycombiningallfourentrieswiththeirrespectiveunits.
WhentheENTbuttonispressedtheselectedtimeunitareaautomaticallychangestonextentrytotheright,
unlessthesecondsentryisselectedwhentheactionissameaspressingtheoverallRETURNbutton.
17.1.2.4 SETTINGTHESTART/ STOPDE TECTIONLEVELS(EN50564:20115.3.2D)
IfyouselectedtheEN505645.3.2dmethodthentheMODEDETECTsectionisshownonthescreenwithtwobuttonswhichallows
youtosetthepowerlevelsatwhichthespecificproductmodewillbedetectedasstartingandending.TheselevelsareinWattsand
theXT2640willdetectthestartconditionassoonasthemeasuredpowerlevelexceedstheSTARTsetting,andwillautomatically
stopthemeasurementwhenmeasuredpowerleveldropsbelowtheENDsetting.