Designation:A598/A598M−02(Reapproved2015)StandardTestMethodforMagneticPropertiesofMagneticAmplifierCores1ThisstandardisissuedunderthefixeddesignationA598/A598M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthemag-neticperformanceoffullyprocessedcoresformagneticamplifier-typeapplications.1.2Testsmaybeconductedatexcitationfrequenciesof60,400,1600Hz,orhigherfrequencies.1.3Permissiblecoresizesforthistestmethodarelimitedonlybytheavailablepowersuppliesandtherangeandsensitivityoftheinstrumentation.1.4Atspecifiedvaluesoffull-wavesinusoidal-currentexcitation,Hmax,thistestmethodprovidesproceduresofdeterminingthecorrespondingvalueofmaximuminduction,Bmax.1.5Atspecifiedvaluesofhalf-wavesinusoidal-currentexcitation,thistestmethodprovidesproceduresfordetermin-ingtheresidualinduction,Br.1.6Atincreasedspecifiedvaluesofhalf-wavesinusoidal-currentexcitation,thistestmethodprovidesproceduresfordeterminingthedcreversebiasingmagneticfieldstrength,H1,requiredtoresettheinductioninthecorematerialpastBrtoavaluewherethetotalinductionchange,∆B1,becomesapproxi-matelyonethirdoftheinductionchange,2Bp.Italsoprovidesproceduresfordeterminingtheadditionaldcresetmagneticfieldstrength,∆H,which,combinedwithH1,isthevaluerequiredtoresettheinductioninthecorematerialpastBrtoavaluewherethetotalinductionchange,∆B2,becomesapproxi-matelytwothirdsoftheinductionchange2Bp.1.7Thistestmethodspecifiesproceduresfordeterminingcoregainfromthecorrespondingbiasingandinductionchanges,∆Hand∆B.1.8Thistestmethodcoverstestproceduresandrequire-mentsforevaluationoffinishedcoreswhicharetobeusedinmagnetic-amplifier-typeapplications.Itisnotatestforbasic-materialmagneticproperties.1.9ThistestmethodshallbeusedinconjunctionwithPracticeA34/A34M.1.10Explanationsofsymbolsanda...
