Designation:A348/A348M−05(Reapproved2015)StandardTestMethodforAlternatingCurrentMagneticPropertiesofMaterialsUsingtheWattmeter-Ammeter-VoltmeterMethod,100to10000Hzand25-cmEpsteinFrame1ThisstandardisissuedunderthefixeddesignationA348/A348M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthemag-neticpropertiesofflat-rolledmagneticmaterialsusingEpsteintestspecimenswithdouble-lapjointsinthe25-cmEpsteinframe.Itcoversdeterminationofcoreloss,rmsandpeakexcitingcurrent,excitingpower,magneticfieldstrength,andpermeability.Thistestmethodiscommonlyusedtotestgrain-orientedandnonorientedelectricalsteelsbutmayalsobeusedtotestnickel-iron,cobalt-iron,andotherflat-rolledmagneticmaterials.1.2ThistestmethodshallbeusedinconjunctionwithPracticeA34/A34MandTestMethodA343/A343M.1.3Testsunderthistestmethodmaybeconductedwitheithernormalacmagnetizationorwithacmagnetizationandsuperimposeddcbias(incrementalmagnetization).1.4Ingeneral,thistestmethodhasthefollowinglimita-tions:1.4.1Frequency—Therangeofthistestmethodnormallycoversfrequenciesfrom100to10000Hz.Withproperequipment,thetestmethodmaybeextendedabove10000Hz.Whentestsarelimitedtotheuseofpowersourceshavingfrequenciesbelow100Hz,theyshallusetheproceduresofTestMethodA343/A343M.1.4.2MagneticFluxDensity(mayalsobereferredtoasFluxDensity)—Therangeofmagneticfluxdensityforthistestmethodisgovernedbythetestspecimenpropertiesandbytheavailableinstrumentsandotherequipmentcomponents.Normally,formanymaterials,themagneticfluxdensityrangeisfrom1to15kG[0.1to1.5T].1.4.3CoreLossandExcitingPower—Thesemeasurementsarenormallylimitedtotestconditionsthatdonotcauseatestspecimentemperatureriseinexcessof50°Corexceed100W/lb[220W/kg].1.4.4Excitation—Eitherrmsorpeakvaluesofexcitingcurrentmaybemeasuredatanytestpoin...
