Designation:A927/A927M−11StandardTestMethodforAlternating-CurrentMagneticPropertiesofToroidalCoreSpecimensUsingtheVoltmeter-Ammeter-WattmeterMethod1ThisstandardisissuedunderthefixeddesignationA927/A927M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofseveralacmagneticpropertiesofeitherlaminatedringortoroidaltapewoundcoresmadefromflatrolledproduct.1.2Thistestmethodcoverstestequipmentandproceduresfordeterminationofspecificcoreloss,specificexcitingpower,andpeakpermeabilityforpowerandaudiofrequencies(50to20000Hz)undersinusoidalfluxconditions.1.3Thistestmethod,becauseoftheuseofafeedback-controlledpoweramplifier,iswellsuitedfordeterminationofacmagneticpropertiesatmagneticfluxdensitiesabovethekneeofthemagnetizationcurveandisparticularlyusefulfortestingofhigh-saturationiron-cobaltalloys(forexample,alloyslistedinSpecificationA801),althoughuseofthistestmethodisnotrestrictedtoaparticulartypeofmaterial.1.4ThistestmethodshallbeusedinconjunctionwithPracticeA34/A34MandTerminologyA340.1.5ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2A34/A34MPracticeforSamplingandProcurementTestingofMagneticMaterialsA340TerminologyofSymbolsandDefinitionsRelatingtoMagneticTestingA697/A697MTestMethodforAlternatingCurrentMagneticPropertiesofLaminatedCoreSpe...
