ASTM_A_343_-_A_343M_-_14.pdf

Designation:A343/A343M14Standard Test Method forAlternating-Current Magnetic Properties of Materials atPower Frequencies Using Wattmeter-Ammeter-VoltmeterMethod and 25-cm Epstein Test Frame1This standard is issued under the fixed designation A343/A343M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers tests for the magnetic propertiesof basic flat-rolled magnetic materials at power frequencies(25to 400 Hz)using a 25-cm Epstein test frame and the 25-cmdouble-lap-jointed core.It covers the determination of coreloss,rms exciting power,rms and peak exciting current,andseveral types of ac permeability and related properties offlat-rolled magnetic materials under ac magnetization.1.2 This test method shall be used in conjunction withPractice A34/A34M.1.3 This test method2provides a test for core loss andexciting current at moderate and high magnetic flux densitiesup to 15 kG 1.5 T on nonoriented electrical steels and up to18 kG 1.8 T on grain-oriented electrical steels.1.4 The frequency range of this test method is normally thatof the commercial power frequencies 50 to 60 Hz.With properinstrumentation,it is also acceptable for measurements at otherfrequencies from 25 to 400 Hz.1.5 This test method also provides procedures for calculat-ing ac impedance permeability from measured values of rmsexciting current and for ac peak permeability from measuredpeak values of total exciting currents at magnetic fieldstrengths up to about 150 Oe 12 000 A/m.1.6 Explanation of symbols and abbreviated definitionsappear in the text of this test method.The official symbols anddefinitions are listed in Terminology A340.1.7 The values and equations stated in customary(cgs-emuand inch-pound)or SI units are to be regarded separately asstandard.Within this standard,SI units are shown in bracketsexcept for the sections concerning calculations where there areseparate sections for the respective unit systems.The valuesstated in each system may not be exact equivalents;therefore,each system shall be used independently of the other.Combin-ing values from the two systems may result in non-conformance with this standard.1.8 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:3A34/A34M Practice for Sampling and Procurement Testingof Magnetic MaterialsA340 Terminology of Symbols and Definitions Relating toMagnetic TestingA677 Specification for Nonoriented Electrical Steel FullyProcessed TypesA683 Specification for Nonoriented Electrical Steel,Semi-processed TypesA876 Specification for Flat-Rolled,Grain-Oriented,Silicon-Iron,Electrical Steel,Fully Processed TypesA889/A889M Test Method for Alternating-Current Mag-netic Properties of Materials at Low Magnetic FluxDensityUsingtheVoltmeter-Ammeter-Wattmeter-Varmeter Method and 25-cm Epstein FrameE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE1338 Guide for Identification of Metals and Alloys in1This test method is under the jurisdiction of ASTM Committee A06 onMagnetic Properties and is the direct responsibility of Subcommittee A06.01 on TestMethods.Current edition approved May 1,2014.Published May 2014.Originallyapproved in 1949.Last previous edition approved in 2008 as A343/A343M-03(2008).DOI:10.1520/A0343_A0343M-14.2Burgwin,S.L.,“Measurement of Core Loss and A-C Permeability with the25-cm Epstein Frame,”Proceedings,American Society for Testing and Materials,ASTEA,Vol 41,1941,p.779.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 Computerized Material Property Databases3.Significance and Use3.1 This test method is a fundamental method for evaluatingthe magnetic performance of flat-rolled magnetic materials ineither as-sheared or stress-relief annealed condition.3.2 This test method is suitable for design,specificationacceptance,service evaluation,and research and development.4.Test Specimens4.1 The specimens for this test shall be selected andprepared for testing in accordance with provisions of PracticeA34/A34M and as directed in Annex A3 of this test method.5.Basic Circuit5.1 Fig.1 shows the essential apparatus and basic circuitconnections for this te