ASTM D4496-2004e1 中等导电材料直流阻抗或导电性的标准试验方法

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【英文标准名称】:StandardTestMethodforD-CResistanceorConductanceofModeratelyConductiveMaterials
【原文标准名称】:中等导电材料直流阻抗或导电性的标准试验方法
【标准号】:ASTMD4496-2004e1
【标准状态】:现行
【国别】:
【发布日期】:2004
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D09.12
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:电气工程;电阻器;电绝缘;电导性;导电体;电气试验;试验
【英文主题词】:electricalshielding;moderatelyconductive;semicom;surfaceresistivity;volumeresistivity
【摘要】:Thistestmethodisusefulforthecomparisonofmaterials,asaqualitycontroltest,andmaybeusedforspecificationpurposes.Thistestmethodisusefulintheselectionanduseofmaterialsinwires,cables,bushings,high-voltagerotatingmachinery,andotherelectricalapparatusinwhichshieldingorthedistributionofvoltagestressmaybeofvalue.Commerciallyavailablex201C;moderatelyconductivex201D;materialsfrequentlyarecomprisedofbothconductiveandresistivecomponents(thatis,cellulosefiberswithcolloidalcarbonblackparticlesattachedtoportionsofthesurfacesofthosefibers,ordiscreteconductiveparticlesadheredtothesurfacesofelectricalinsulatingpolymers).Suchcommerciallyavailablematerialsareoftenmanufacturedinamannerthatmayresultinanisotropywithrespecttoelectricalconduction.Hence,thesignificanceoftestsusingthistestmethodmaydependupontheorientationofthespecimentestedtotheelectricfieldandtherelationshipbetweenthisorientationandtheorientationofthematerialintheelectricalapparatuswhichusesthesematerials.1.1Thistestmethodcoversthedeterminationofthemeasurementofelectricalresistanceorconductanceofmaterialsthataregenerallycategorizedasmoderatelyconductiveandareneithergoodelectricalinsulatorsnorgoodconductors.1.2Testmeasurementsofelectricalresistance(orconductance)andspecimengeometrydataareusedtocomputeanelectricalresistivityforthematerial.1.3Thistestmethodappliestoallmaterialsthatexhibitvolumeresistivityintherangeof1to107-cmorsurfaceresistivityintherangeof103to107(persquare).1.4Thistestmethodisdesignedformeasurementsatstandardconditionsof23Cand50%relativehumidity,butitsprinciplesofoperationcanbeappliedtospecimensmeasuredatlowerorhighertemperaturesandrelativehumidities.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Specificprecautionarystatementsaregivenin.
【中国标准分类号】:K10
【国际标准分类号】:29_050
【页数】:5P.;A4
【正文语种】: