Designation:C611−98(Reapproved2016)AnAmericanNationalStandardStandardTestMethodforElectricalResistivityofManufacturedCarbonandGraphiteArticlesatRoomTemperature1ThisstandardisissuedunderthefixeddesignationC611;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationoftheelec-tricalresistivityofmanufacturedcarbonandgraphitearticlesatroomtemperature.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.Terminology2.1Definitions:2.1.1resistivity—thepropertyofamaterialthatdeterminesitsresistancetotheflowofanelectricalcurrent.Itisdefinedasthevalueofρ,inmilliohmmetres,asfollows:ρ5~R·A!/Lwhere:R=resistanceofaspecimenofthematerialofuniformcrosssection,ohms,A=uniformcrosssection,mm2,andL=distancebetweenpotentialcontacts,mm.3.SignificanceandUse3.1Thistestmethodprovidesameansofdeterminingtheelectricalresistivityofcarbonorgraphitespecimens.Theuseofspecimensthatdonotconformtothespecimensizelimitationsdescribedinthetestmethodmayresultinanalterationoftestmethodaccuracy.4.Apparatus4.1Themeansforapplyingcurrentandpotentialterminalstothespecimenisspecifiedin5.2.3.1.AtypicalspecimenholderisshowninFig.1.4.2Bridge,Potentiometer,orSuitableDigitalVoltmeter,withnecessaryaccessoriesformakingresistancemeasure-mentswithalimitoferroroflessthan0.5%.Fig.2schematicallydepictstwowiringdiagramsthathavebeenfoundsatisfactoryforthispurpose.4.3Themeansformeasuringthedimensionsofthespeci-menshouldbeadequatetodetermineitsgagelengthanditsmeanareaofcrosssection,eachwit...
