ASTM A343/A343M-14
(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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: A343/A343M − 14
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 standard. Within this standard, SI units are shown in brackets
except for the sections concerning calculations where there are
1.1 Thistestmethodcoverstestsforthemagneticproperties
separate sections for the respective unit systems. The values
ofbasicflat-rolledmagneticmaterialsatpowerfrequencies(25
stated in each system may not be exact equivalents; therefore,
to 400 Hz) using a 25-cm Epstein test frame and the 25-cm
each system shall be used independently of the other. Combin-
double-lap-jointed core. It covers the determination of core
ing values from the two systems may result in non-
loss, rms exciting power, rms and peak exciting current, and
conformance with this standard.
several types of ac permeability and related properties of
1.8 This standard does not purport to address all of the
flat-rolled magnetic materials under ac magnetization.
safety concerns, if any, associated with its use. It is the
1.2 This test method shall be used in conjunction with
responsibility of the user of this standard to establish appro-
Practice A34/A34M.
priate safety and health practices and determine the applica-
2
1.3 This test method provides a test for core loss and
bility of regulatory limitations prior to use.
exciting current at moderate and high magnetic flux densities
2. Referenced Documents
up to 15 kG [1.5T] on nonoriented electrical steels and up to
3
18 kG [1.8T] on grain-oriented electrical steels.
2.1 ASTM Standards:
A34/A34MPractice for Sampling and Procurement Testing
1.4 Thefrequencyrangeofthistestmethodisnormallythat
of Magnetic Materials
ofthecommercialpowerfrequencies50to60Hz.Withproper
A340Terminology of Symbols and Definitions Relating to
instrumentation,itisalsoacceptableformeasurementsatother
Magnetic Testing
frequencies from 25 to 400 Hz.
A677Specification for Nonoriented Electrical Steel Fully
1.5 This test method also provides procedures for calculat-
Processed Types
ing ac impedance permeability from measured values of rms
A683Specification for Nonoriented Electrical Steel, Semi-
exciting current and for ac peak permeability from measured
processed Types
peak values of total exciting currents at magnetic field
A876Specification for Flat-Rolled, Grain-Oriented, Silicon-
strengths up to about 150 Oe [12 000 A/m].
Iron, Electrical Steel, Fully Processed Types
1.6 Explanation of symbols and abbreviated definitions
A889/A889MTest Method for Alternating-Current Mag-
appear in the text of this test method. The official symbols and
netic Properties of Materials at Low Magnetic Flux
definitions are listed in Terminology A340.
Density Using the Voltmeter-Ammeter-Wattmeter-
Varmeter Method and 25-cm Epstein Frame
1.7 The values and equations stated in customary (cgs-emu
E177Practice for Use of the Terms Precision and Bias in
and inch-pound) or SI units are to be regarded separately as
ASTM Test Methods
E691Practice for Conducting an Interlaboratory Study to
1
This test method is under the jurisdiction of ASTM Committee A06 on
Determine the Precision of a Test Method
MagneticPropertiesandisthedirectresponsibilityofSubcommitteeA06.01onTest
Methods. E1338Guide for Identification of Metals and Alloys in
Current edition approved May 1, 2014. Published May 2014. Originally
approved in 1949. Last previous edition approved in 2008 as A343/A343M-03
3
(2008). DOI: 10.1520/A0343_A0343M-14. 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 Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A343/A343M − 14
Computerized Material Property Databases current drain in the secondary is quite small, especially when
using modern high-input impedance instrumentation, the
3. Significance and Use
switches and wiring should be selected to minimize the lead
resistance so that the voltage available at the terminals of the
3.1 Th
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A343/A343M − 03 (Reapproved 2008) A343/A343M − 14
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 designation A343/A343M; the number immediately following the designation indicates the year
of 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. 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.
2
1.3 This test method 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 stated in either SI units or inch-pound units 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 the standard. Within this standard, SI units are shown in brackets except in the sections
concerning calculations where there are separate sections for the respective unit systems.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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
3
2.1 ASTM Standards:
A34/A34M Practice for Sampling and Procurement Testing of Magnetic Materials
A340 Terminology of Symbols and Definitions Relating to Magnetic Testing
A677 Specification for Nonoriented Electrical Steel Fully Processed Types
A683 Specification for Nonoriented Electrical Steel, Semiprocessed Types
A876 Specification for Flat-Rolled, Grain-Oriented, Silicon-Iron, Electrical Steel, Fully Processed Types
1
This test method is under the jurisdiction of ASTM Committee A06 on Magnetic Properties and is the direct responsibility of Subcommittee A06.01 on Test Methods.
Current edition approved May 1, 2008May 1, 2014. Published June 2008May 2014. Originally approved in 1949. Last previous edition approved in 20032008 as
A343/A343M-03. -03 (2008). DOI: 10.1520/A0343_A0343M-03R08.10.1520/A0343_A0343M-14.
2
Burgwin, S. L., “Measurement of Core Loss and A-C Permeability with the 25-cm Epstein Frame,” Proceedings, American Society for Testing and Materials, ASTEA,
Vol 41, 1941, p. 779.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A343/A343M − 14
A889/A889M Test Method for Alternating-Current Magnetic Properties of Materials
...
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