Designation:A341/A341M−16StandardTestMethodforDirectCurrentMagneticPropertiesofSoftMagneticMaterialsUsingD-CPermeametersandthePointbyPoint(Ballistic)TestMethods1ThisstandardisissuedunderthefixeddesignationA341/A341M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodprovidesdcpermeametertestsforthebasicmagneticpropertiesofsoftmagneticmaterialsintheformofbars,rods,wire,orstripspecimenswhichmaybecut,machined,orgroundfromcast,compacted,sintered,forged,extruded,rolled,orotherfabricatedmaterials.Itincludestestsfordeterminationofthenormalinductionundersymmetricallycyclicallymagnetized(SCM)conditionsandthehysteresisloop(B-Hloop)takenunderconditionsofrapidlychangingorsteepwavefrontreversalsofthedirectcurrentmagneticfieldstrength.Thismethodhasbeenhistoricallyreferredtoastheballistictestmethod.Fortestinghardorpermanentmagnetmaterials,TestMethodA977/A977Mshallbeused.1.2ThistestmethodshallbeusedinconjunctionwithPracticeA34/A34M.1.3Thistestmethodcoversarangeofmagneticfieldstrengthinthespecimenfromabout0.05Oe[4A/m]uptoabove5000Oe[400kA/m]throughtheuseofseveralpermeameters.Theseparatepermeameterscoverthistestregioninseveraloverlappingranges.1.4Normalinductionandhysteresispropertiesmaybedeterminedoverthemagneticfluxdensityrangefromessen-tiallyzerotothesaturationinductionformostmaterials.1.5RecommendationsoftheusefulmagneticfieldstrengthrangeforeachofthepermeametersareshowninTable1.2Permeametersparticularlywellsuitedforgeneraltestingofsoftmagneticmaterialsareshowninboldface.Also,seeSections3and4forgenerallimitationsrelativetotheuseofpermeameters.1.6ThesymbolsandabbreviateddefinitionsusedinthistestmethodappearwithFig.1andinappropriatesectionsofthisdocument.Fortheofficialdefinitions,s...
