ASTM A343/A343M-14(2019)
(Test Method)Standard Test Method for Alternating-Current Magnetic Properties of Materials at Power Frequencies Using Wattmeter-Ammeter-Voltmeter Method and 25-cm Epstein Test Frame
Standard Test Method for Alternating-Current Magnetic Properties of Materials at Power Frequencies Using Wattmeter-Ammeter-Voltmeter Method and 25-cm Epstein Test Frame
SIGNIFICANCE AND USE
3.1 This test method is a fundamental method for evaluating the magnetic performance of flat-rolled magnetic materials in either as-sheared or stress-relief annealed condition.
3.2 This test method is suitable for design, specification acceptance, service evaluation, and research and development.
SCOPE
1.1 This test method covers tests for the magnetic properties of basic flat-rolled magnetic materials at power frequencies (25 to 400 Hz) using a 25-cm Epstein test frame and the 25-cm double-lap-jointed core. It covers the determination of core loss, rms exciting power, rms and peak exciting current, and several types of ac permeability and related properties of flat-rolled magnetic materials under ac magnetization.
1.2 This test method shall be used in conjunction with Practice A34/A34M.
1.3 This test method2 provides a test for core loss and exciting current at moderate and high magnetic flux densities up to 15 kG [1.5 T] on nonoriented electrical steels and up to 18 kG [1.8 T] on grain-oriented electrical steels.
1.4 The frequency range of this test method is normally that of the commercial power frequencies 50 to 60 Hz. With proper instrumentation, it is also acceptable for measurements at other frequencies from 25 to 400 Hz.
1.5 This test method also provides procedures for calculating ac impedance permeability from measured values of rms exciting current and for ac peak permeability from measured peak values of total exciting currents at magnetic field strengths up to about 150 Oe [12 000 A/m].
1.6 Explanation of symbols and abbreviated definitions appear in the text of this test method. The official symbols and definitions are listed in Terminology A340.
1.7 The values and equations stated in customary (cgs-emu and inch-pound) or SI units are to be regarded separately as standard. Within this standard, SI units are shown in brackets except for the sections concerning calculations where there are separate sections for the respective unit systems. The values 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 non-conformance with this standard.
1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.9 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: A343/A343M − 14 (Reapproved 2019)
Standard Test Method for
Alternating-Current Magnetic Properties of Materials at
Power Frequencies Using Wattmeter-Ammeter-Voltmeter
1
Method and 25-cm Epstein Test Frame
This standard is issued under the fixed designationA343/A343M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope separate sections for the respective unit systems. The values
stated in each system may not be exact equivalents; therefore,
1.1 Thistestmethodcoverstestsforthemagneticproperties
each system shall be used independently of the other. Combin-
ofbasicflat-rolledmagneticmaterialsatpowerfrequencies(25
ing values from the two systems may result in non-
to 400 Hz) using a 25-cm Epstein test frame and the 25-cm
conformance with this standard.
double-lap-jointed core. It covers the determination of core
1.8 This standard does not purport to address all of the
loss, rms exciting power, rms and peak exciting current, and
safety concerns, if any, associated with its use. It is the
several types of ac permeability and related properties of
responsibility of the user of this standard to establish appro-
flat-rolled magnetic materials under ac magnetization.
priate safety, health, and environmental practices and deter-
1.2 This test method shall be used in conjunction with
mine the applicability of regulatory limitations prior to use.
Practice A34/A34M.
1.9 This international standard was developed in accor-
2
1.3 This test method provides a test for core loss and
dance with internationally recognized principles on standard-
exciting current at moderate and high magnetic flux densities
ization established in the Decision on Principles for the
up to 15 kG [1.5T] on nonoriented electrical steels and up to
Development of International Standards, Guides and Recom-
18 kG [1.8T] on grain-oriented electrical steels.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.4 Thefrequencyrangeofthistestmethodisnormallythat
ofthecommercialpowerfrequencies50to60Hz.Withproper
2. Referenced Documents
instrumentation,itisalsoacceptableformeasurementsatother
3
frequencies from 25 to 400 Hz.
2.1 ASTM Standards:
A34/A34MPractice for Sampling and Procurement Testing
1.5 This test method also provides procedures for calculat-
of Magnetic Materials
ing ac impedance permeability from measured values of rms
A340Terminology of Symbols and Definitions Relating to
exciting current and for ac peak permeability from measured
Magnetic Testing
peak values of total exciting currents at magnetic field
A677Specification for Nonoriented Electrical Steel Fully
strengths up to about 150 Oe [12 000 A/m].
Processed Types
1.6 Explanation of symbols and abbreviated definitions
A683Specification for Nonoriented Electrical Steel, Semi-
appear in the text of this test method. The official symbols and
processed Types
definitions are listed in Terminology A340.
A876Specification for Flat-Rolled, Grain-Oriented, Silicon-
1.7 The values and equations stated in customary (cgs-emu Iron, Electrical Steel, Fully Processed Types
and inch-pound) or SI units are to be regarded separately as A889/A889MTest Method for Alternating-Current Mag-
standard. Within this standard, SI units are shown in brackets netic Properties of Materials at Low Magnetic Flux
except for the sections concerning calculations where there are Density Using the Voltmeter-Ammeter-Wattmeter-
Varmeter Method and 25-cm Epstein Frame
E177Practice for Use of the Terms Precision and Bias in
1
This test method is under the jurisdiction of ASTM Committee A06 on
ASTM Test Methods
MagneticPropertiesandisthedirectresponsibilityofSubcommitteeA06.01onTest
E691Practice for Conducting an Interlaboratory Study to
Methods.
Current edition approved April 1, 2019. Published April 2019. Originally
approved in 1949. Last previous edition approved in 2014 as A343/A343M–14.
3
DOI: 10.1520/A0343_A0343M-14R19. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
2
Burgwin, S. L., “Measurement of Core Loss and A-C Permeability with the contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
25-cm Epstein Frame,” Proceedings, American Society for Testing and Materials, Standards volume information, refer to the standard’s Document Summary page on
ASTEA, Vol 41, 1941, p. 779. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Consho
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.