Designation:A772/A772M−00(Reapproved2016)StandardTestMethodforACMagneticPermeabilityofMaterialsUsingSinusoidalCurrent1ThisstandardisissuedunderthefixeddesignationA772/A772M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodprovidesameansfordeterminationoftheimpedancepermeability(µz)offerromagneticmaterialsundertheconditionofsinusoidalcurrent(sinusoidalH)exci-tation.Testspecimensintheformoflaminatedtoroidalcores,tape-woundtoroidalcores,andlink-typelaminatedcoreshavinguniformcrosssectionsandclosedfluxpaths(noairgaps)areused.Themethodisintendedasameansfordeterminingthemagneticperformanceofferromagneticstriphavingathicknesslessthanorequalto0.025in.[0.635mm].1.2ThistestmethodshallbeusedinconjunctionwiththoseapplicableparagraphsinPracticeA34/A34M.1.3Thevaluesandequationsstatedincustomary(cgs-emuandinch-pound)orSIunitsaretoberegardedseparatelyasstandard.Withinthisstandard,SIunitsareshowninbracketsexceptforthesectionsconcerningcalculationswherethereareseparatesectionsfortherespectiveunitsystems.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combin-ingvaluesfromthetwosystemsmayresultinnonconformancewiththisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2A34/A34MPracticeforSamplingandProcurementTestingofMagneticMaterialsA340TerminologyofSymbolsandDefinitionsRelatingtoMagneticTesting3.Terminology3.1Definitions—ThetermsandsymbolsusedinthistestmethodaredefinedinTerminologyA340.4.SignificanceandUse4.1Thepermeabilitydeterminedbythismethodistheimpedance...
