ASTM_A_1013_-_00_2013e1.pdf

Designation:A101300(Reapproved 2013)1Standard Test Method forHigh-Frequency(10 kHz-1 MHz)Core Loss of Soft MagneticCore Components at Controlled Temperatures Using theVoltmeter-Ammeter-Wattmeter Method1This standard is issued under the fixed designation A1013;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTELanguage in the units statement was editorially corrected in June 2013.1.Scope1.1 This test method covers the equipment,procedures,andmeasurement of core loss of either toroidal or mated softmagnetic core components,such as soft ferrite cores,ironpowder cores,and so forth,over ranges of controlled ambienttemperatures typically from 20 to+120C,frequencies from10 kHz to 1 MHz,under sinusoidal flux conditions.1.2 The values and equations stated in customary(cgs-emuand inch-pound)or SI units are to be regarded separately asstandard.Within this test method,SI units are shown inbrackets except for the sections concerning calculations wherethere are separate sections for the respective unit systems.Thevalues stated in each system may not be exact equivalents;therefore,each system shall be used independently of the other.Combining values from the two systems may result in noncon-formance with this standard.1.3 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:2A34/A34M Practice for Sampling and Procurement Testingof Magnetic MaterialsA340 Terminology of Symbols and Definitions Relating toMagnetic TestingE177 Practice for Use of the Terms Precision and Bias inASTM Test Methods3.Terminology3.1 The definitions of terms,symbols,and conversion fac-tors relating to magnetic testing,used in this test method,arefound in Terminology A340.3.2 Definitions of Terms Specific to This Standard:3.2.1 bifilar transformera transformer in which the turnsof the primary and secondary windings are wound together sideby side and in the same direction.This type of winding resultsin near unity coupling,so that there is a very efficient transferof energy from primary to secondary.3.2.2 core-loss density,Pcdcore loss per unit volume inmW/cm3W m3.3.2.3 effective permeabilitythe relative permeability of amagnetic circuit including the effect of air gaps in the magneticpath length.3.2.4 mated core settwo or more core segments assembledwith the magnetic flux path perpendicular to the matingsurface.4.Significance and Use4.1 This test method is designed for testing of either toroidalor mated soft magnetic core components over a range oftemperatures,frequencies,and flux densities.4.2 The reproducibility and repeatability of this test methodare such that it is suitable for design,specification acceptance,service evaluation,and research and development.5.Apparatus5.1 The apparatus shall consist of as many of the componentparts as shown in the block circuit diagrams(Figs.1 and 2)anddescribed as follows and in the appendix,as required toperform the tests.5.2 Signal GeneratorA low distortion sine wave signalgenerator is required.The frequency accuracy of the signalgenerator should be within 60.1%with an output amplituderange from 1-mV to 10-V p-p.1This 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 1,2013.Published June 2013.Originallyapproved in 2000.Last previous edition approved in 2005 as A1013 00(2005).DOI:10.1520/A101300R13E01.2For 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 5.3 Broadband Power Amplifier,capable of amplifying theoutput of the signal source by 50 dB.5.4 Volt-Amp-Watt Meter with Current Transformer,ac-coupled,broadband,power factor independent,true RMSreading instrument.Voltage channel minimum input imped-ance 1 M,voltage range from 2 to 100 V,current ranges from5 mA to 5A,power ranges from 100 mW to 500 W.Thefull-scale accuracy of the wattmeter shall not exceed 0.75%ofthe product of the input voltage and current ranges.5.5 Flux VoltmeterA full-wave true-averaging voltmeterwith scale reading in average volts times 1.111 so that itsindications will be identical with those of a true rms voltmeteron a pure sinusoidal voltage.Input impedance of at least 2 M.To produce the estimated precision of test unde