Designation:A342/A342M−14StandardTestMethodsforPermeabilityofWeaklyMagneticMaterials1ThisstandardisissuedunderthefixeddesignationA342/A342M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thesetestmethodscoverfourproceduresfordetermi-nationofthepermeability[relativepermeability]2ofmaterialshavingapermeabilitynotexceeding6.0.1.2Thetestmethodscoveredareasfollows:1.2.1TestMethod1—FluxmetricMethodissuitableformaterialswithpermeabilitiesbetween1.0and4.0.Thismethodpermitstheusertoselectthemagneticfieldstrengthatwhichthepermeabilityistobemeasured.1.2.2TestMethod2—PermeabilityofParamagneticMate-rialshasbeeneliminatedasanacceptablemethodoftest.1.2.3TestMethod3—LowMuPermeabilityIndicatorissuitableformeasuringthepermeabilityofamaterialas“lessthan”or“greaterthan”thatofcalibratedstandardinsertswithpermeabilitybetween1.01and6.0,asdesignatedforuseinaLow-MuPermeabilityIndicator.3Inthismethod,asmallvolumeofspecimenissubjectedtoalocalmagneticfieldthatvariesinmagnitudeanddirection,soitisnotpossibletospecifythemagneticfieldstrengthatwhichthemeasurementismade.1.2.4TestMethod4—FluxDistortionissuitableformate-rialswithpermeabilitybetween1.0and2.0.Inthismethod,asmallvolumeofspecimenissubjectedtoalocalmagneticfieldthatvariesinmagnitudeanddirection,soitisnotpossibletospecifythemagneticfieldstrengthatwhichthemeasurementismade.41.2.5TestMethod5—VibratingSampleMagnetometryissuitableformaterialswithpermeabilitybetween1.0and4.0.Thistestmethodpermitstheusertoselectthemagneticfieldstrengthatwhichthepermeabilityistobemeasured.1.3Materialstypicallytestedbythesemethodssuchasausteniticstainlesssteelsmaybeweaklyferromagnetic.Thatis,themagneticpermeabilityisdependentonthemagneticfieldstrength.Asaconsequenc...
