XITRON XT2640 - Performing En50564 Low Power Measurements - the Stby Power Screen; Performing En61000-3-2; Screen; Performing and Viewing a Spectrum Analysis - the Spectrum Screen

XT2640OperatingManual 13July2016 Page67of187
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AlternativelyyoucanmakearecordoftheSCOPEVIEWscreenbysavinganimageofittoagraphicfileonanexternalUSBdrive
attachedtothefrontpanelUSBport.Notethatthetriggerconfigurationandanybandwidthlimitationareincludedonthescreen,
enablingthesetobeincludedintherecordedimage.
Briefly,thisisperformedby–
1.
InsertthedriveintothefrontpanelUSBportandwaitforittobeREADY.
2.
Displaythescreentoberecorded.
3.
PresstheDRIVEINFOareaofthescreen,thescreenshowsthefileexport/importscreen.
4.
PresstheSCREENIMAGEbutton.Thescreenchangestoallowingyoutoenterafilename.
5.
Enterthedesiredfilename(theextensionisautomaticallyprovided).
6.
Ifthefilealreadyexiststhenyouarepromptedtorespondifyouwishtooverwriteitornot.
7.
Thefileisthenwritten.
12.11 PERFORMINGEN50564LOWPOWERMEASUREMENTS– THESTBYPOWER
SCREEN
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.Theuseofthisscreenisdetailedinsection17.
12.12 PERFORMINGEN61000‐3‐2OR‐12ASSESSMENTS–THEASSESSEUTSCREEN
TheASSESSEUTScreengivesyoutheabilitytoconfigureandperformEUTassessmentscompliantwithEN61000‐3‐2or‐12.The
useofthisscreenisdetailedinsection18.
12.13 PERFORMINGANDVIEWINGASPECTRUMANALYSIS–THESPECTRUM
SCREEN
ThisisonlyavailableifoptionH500isinstalledandonlyiftheXT2640isconfiguredforspectrumanalysisbytheMEASMODE
settingontheMEASCONFIGscreen.
NormallytheXT2640isusedforgeneralpoweranalysisandharmonicanalysispurposes,butinsomesituationsitmaybedesirable
toperformspectrumanalysisonthesignalsinsteadofharmonicanalysis.IfoptionH500isinstalled,thenthisispossibleinthe
XT2640.
Anexampleofthisisformeasuringdistortioninaccordancewithsomeavionicsspecificationswhichrequireaspectralanalysistobe
performedwith20Hzresolutionforfrequenciesupto150kHz(notethatthismaximumfrequencyrequiresWchanneltypesasitis
abovethe115kHzupperlimitforL,SorAchanneltypes).TheXT2640canbeconfiguredtomeasurethespectrumofallsignalsat
thesametimetothisrequirement.
Note:
SPECTRUMmodeisasingleVPAmode;onlyoneVPAcanbeusedinspectrumanalysismode.
YoudonothavetobeviewingtheSPECTRUMscreenforspectrumdatatobemeasured.
Whenconfiguredforspectrumanalysis,theXT2640stillperformsnormalpoweranalysis(unchanged)andalsoharmonic
analysis(butlimitedtothefundamentalcomponent).
TheXT2640isasinglemeasurementDFTbasedspectrumanalyzernota‘scanning’typespectrumanalyzer.Therearetwo
phasestoaspectrumanalysis–
MEASURING.Duringthisphaseallsignalsaresampledandthesesamplesarecollected.Thisphaseisoneperiod
oftheusersetresolutionfrequencyinlength(forexampleifthefrequencyresolutionissetfor1Hzthenthis
phasetakes1second).
PROCESSING.AftercollectingthesamplesduringtheMEASURINGphasetheXT2640thenprocessesthese
samplesbyDFTanalysistoproducethedesiredspectrum.Thereisnomeasurementbeingperformedfor
spectrumanalysisduringthisphase.Oncethisphaseiscompletedtheresultsareavailablefordisplay(or
exportingtoafile)andanewMEASURINGphaseisstarted.
ThereisonlyasingleMEASURINGsamplecollectionphaseandonlyasinglePROCESSINGphaseperspectrum
analysisupdatecycle.Theanalysisofeveryspectralpointanalyzedisperformedonthesamesetofsamplesinits
entiretysotherearenodiscontinuitiesintheanalyzedresults.
12.13.1 CONFIGURINGSPECTRUMANALYSIS
SpectrumAnalysisisconfiguredbyyoumakingthefollowingchangestothenormalconfigurationontheMEASCONFIGscreen–
SettheOPERATINGMODEtoSPECTRUM
SetthedesiredSPECTRUMfrequencyresolutionandmaximumfrequency.
Allothersettingsonthatscreenareaspreviouslydescribed.
12.13.2 OPTIMISINGCONFIGURATION FOR SPECTRUMMEASUREMENTS
TheXT2640performsboththepoweranalysisandspectralanalysisatthesametime.Inmostcasesyoudonotneedtoconsiderthe
compromisesinvolvedinthis,butifyouwishtoperformspectrumanalysiswithafrequencyresolutionlessthantheinverseofthe
poweranalysismeasurementperiodthenitshouldbeconsideredwhethertooptimizeforthespectrumanalysisratherthanforthe