IEC61000-4-15:2010/ISH1:2017–1–IEC2017ICS33.100.20INTERNATIONALELECTROTECHNICALCOMMISSION____________IEC61000-4-15Edition2.02010-08ELECTROMAGNETICCOMPATIBILITY(EMC)–Part4-15:Testingandmeasurementtechniques–Flickermeter–FunctionalanddesignspecificationsINTERPRETATIONSHEET1Thisinterpretationsheethasbeenpreparedbysubcommittee77A:EMC–Lowfrequencyphenomena,ofIECtechnicalcommittee77:Electromagneticcompatibility.Thetextofthisinterpretationsheetisbasedonthefollowingdocuments:FDISReportonvoting77A/966/FDIS77A/973/RVDFullinformationonthevotingfortheapprovalofthisinterpretationsheetcanbefoundinthereportonvotingindicatedintheabovetable.___________InterpretationofrequirementsforrectangularvoltagemodulationwithdutyratioaccordingtoIEC61000-4-15:Electromagneticcompatibility(EMC)–Testingandmeasurementtechniques–Flickermeter–Functionalanddesignspecifications.IEC61000-4-15Ed2givesrequirementsin6.8forwhatiscalled“Rectangularvoltagechangeswith20%dutycycle”.Table11providesthetestspecificationforrectangularvoltagechangeswithdutyratio.TherequirementsperTable11andtheassociatedtestspatternscausedsomequestionsinthepastyear,andthereforeIEC/SC77A/WG-2wishestoclarifythetitleandinterpretationper6.8whichshouldbereadasfollows:6.8Rectangularvoltagemodulationfor20%ofthetimeTheamplitudeofthetestvoltageUisrectangularlymodulatedwitha50%dutycycleat28Hz.Everyminutetheamplitudemodulationisswitchedonfor12sandofffor48s.Table11specifiesthemodulationdepthintermsofvoltagefluctuation(∆U/U),whichisfurtherspecifiedinAnnexB.Thetransitiontimeattheedgesoftherectangularmodulationshallbelessthan0,5ms.Theten-minutePstindicationofthemeterundertestshallbe1,00withatoleranceof±5%.Figure1showsa∆U/U=35%forillustrationpurposes,asa1%to2%modulationwouldnotbevisible.Only400msofthetimeaxisisdepicted,showing200msoneachsideofthemodulationon/offswitchingat12s.NOTETheabovetextin6.8willbeconsideredasareplacementfortheoriginaltextwhenIEC61000-4-15isupdatedeitherthroughanamendmentorreplacedbyanewedition.__________IEC61000-4-15:2010-08/ISH1:2017-08(en)
