XITRON XT2640 - Performing a Low Power Measurement and Viewing the Results

XT2640OperatingManual 13July2016 Page85of187

Note:
Youmayalsomanuallystopthemeasurement,andbysettinganENDlevelof0.0WandaSTARTlevelof0.0Wthen
effectivelythemeasurementperiodwillbetotallymanuallycontrolled.
17.1.3 PERFORMINGALOWPOWERMEASUREMENTANDVIEWING THERESULTS

YoucanSTARTandmanuallystopalowpowermeasurementbypressingtheSTARTbutton(whichislabelledSTOPwhilea
measurementisbeingperformed).ThiscontrolslowpowermeasurementsinallchannelswithintheselectedVPA.
Note:
ForstrictaccordancewithEN50564:2011para.4.3thevoltagesourcetothedevicebeingmeasuredmayneedtobea
regulatedpowersourcewithlimitsonthevoltagelevelandstability,frequencyvalueandstability,voltagecrestfactorand
voltagedistortion.Itispossiblethatthelocalmainssupplymeetstheserequirements,butthisisoftennotthecase.Also,
theEN50564:2011requirementsforvoltagelevelandfrequencyareoftenoverriddenbyotherstandards,usuallycalling
forEN50564:2011measurementofpowerandimposinglimitsonthemeasurementresult,butwhicharespecifictolocal
supplyvoltagesorfrequenciesdifferenttothosedefinedinEN50564:2011.TheXT2640maintainsarecordofthevoltage
level,frequency,voltagecrestfactorandvoltageTHDduringalowpowermeasurementandreportstherangeofthese
measurementsencounteredduringthemeasurement,andalsoreportsifanyofthecrestfactororTHDrequirementsare
exceededbycoloringthedataredifthoseEN50564:2011requirementsareexceeded,buttheXT2640doesnotstopalow
powermeasurementnorotherwisepreventtheuserfromrecordingthefinalmeasurementresult.
YoudonothavetoremainontheSTBYPOWERscreenduringthemeasurement.Themeasurementwillautomatically
progresswhetherthisscreenisbeingdisplayedornot.
ThemeasurementholdcapabilityoftheXT2640isnotappliedtotheSTBYPOWERresults.
Thefollowingdataisshownineachoftheresultsareasonthisscreen,listedinorderfromtoptobottomineacharea.Exceptforthe
totalmeasurementtime,alldataisforthelast2/3
rd
ofthemeasurementtimeifconfiguredforEN505645.3.2amethodorforthe
entiremeasurementtimeifconfiguredforthe5.3.2dmethod.YoucanselectwhichchannelwithintheselectedVPAisbeingviewed
byusingtheCHnbutton(whichislabelledaccordingtothepresentlyselectedchannel).Thisdoesnotaffectmeasurements,onlythe
databeingdisplayed.
17.1.3 .1 TIMERESULTSAREA
1. Theelapsedtotaltimeofthelowpowermeasurement.
2. “WAITING”(ifwaitingfortheconfiguredSTARTpowerleveltobeexceededwhenconfiguredforthe5.3.2dmethod),
“RUNNING”(whenlessthantheminimumtesttime),“EXTENDING”(ifbeyondtheminimumtesttime),ifmanuallystopped
thenitshows“STOPPED”,andifautomaticallycompleteditshows“COMPLETED”.
3. Theaverageactualmeasurementsamplingperiod.
17.1.3 .2 POWERRESULTSARE A
1. Theaveragepower(inWatts).
2. Therangeofpowerencountered.
3. TheslopeofthelinearregressioninW/hour(onlyshownifconfiguredforthe5.3.2amethod).
17.1.3 .3 VOLTSRESULTSAREA
1. TheaverageAC+DCRMSsupplyvoltage.
2. TherangeofAC+DCRMSsupplyvoltageencountered.
3. TherangeofAC+DCRMSsupplyfrequencyencountered.
4. ThehighestsupplyvoltageTHD(measuredoverthe2
nd
through13
th
harmonics)encountered.ThisiscoloredREDifthis
exceedstherequirementsofEN50564:2011(thescreenshownabovegivesanexampleofthisoccurring).
5. Therangeofsupplyvoltagecrestfactor(CF)encountered.ThisiscoloredREDifthisexceedstherequirementsof
EN50564:2011.