ASTM A932/A932M-01(2019)
(Test Method)Standard Test Method for Alternating-Current Magnetic Properties of Amorphous Materials at Power Frequencies Using Wattmeter-Ammeter-Voltmeter Method with Sheet Specimens
Standard Test Method for Alternating-Current Magnetic Properties of Amorphous Materials at Power Frequencies Using Wattmeter-Ammeter-Voltmeter Method with Sheet Specimens
SIGNIFICANCE AND USE
4.1 This test method provides a satisfactory means of determining various ac magnetic properties of amorphous magnetic materials. It was developed to supplement the testing of toroidal and Epstein specimens. For testing toroidal specimens of amorphous materials, refer to Test Method A912/A912M.
4.2 The procedures described herein are suitable for use by manufacturers and users of amorphous magnetic materials for materials specification acceptance and manufacturing control.
Note 2: This test method has been principally applied to the magnetic testing of thermally, magnetically annealed, and flattened amorphous strip at 50 and 60 Hz. Specific core loss at 13 or 14 kG [1.3 or 1.4 T], specific exciting power at 13 or 14 kG [1.3 or 1.4 T], and the flux density, B, at 1 Oe [79.6 A/m] are the recommended parameters for evaluating power grade amorphous materials.
SCOPE
1.1 This test method covers tests for various magnetic properties of flat-cast amorphous magnetic materials at power frequencies (50 and 60 Hz) using sheet-type specimens in a yoke-type test fixture. It provides for testing using either single- or multiple-layer specimens.
Note 1: This test method has been applied only at frequencies of 50 and 60 Hz, but with proper instrumentation and application of the principles of testing and calibration embodied in the test method, it is believed to be adaptable to testing at frequencies ranging from 25 to 400 Hz.
1.2 This test method provides a test for specific core loss, specific exciting power and ac peak permeability at moderate and high flux densities, but is restricted to very soft magnetic materials with dc coercivities of 0.07 Oe [5.57 A/m] or less.
1.3 The test method also provides procedures for calculating ac peak permeability from measured peak values of total exciting currents at magnetic field strengths up to about 2 Oe [159 A/m].
1.4 Explanation of symbols and abbreviated definitions appear in the text of this test method. The official symbols and definitions are listed in Terminology A340.
1.5 This test method shall be used in conjunction with Practice A34/A34M.
1.6 The values stated in either 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. 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 nonconformance with this standard.
1.7 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.
1.8 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: A932/A932M − 01 (Reapproved 2019)
Standard Test Method for
Alternating-Current Magnetic Properties of Amorphous
Materials at Power Frequencies Using Wattmeter-Ammeter-
1
Voltmeter Method with Sheet Specimens
This standard is issued under the fixed designationA932/A932M; 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 responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
1.1 This test method covers tests for various magnetic
mine the applicability of regulatory limitations prior to use.
properties of flat-cast amorphous magnetic materials at power
1.8 This international standard was developed in accor-
frequencies (50 and 60 Hz) using sheet-type specimens in a
dance with internationally recognized principles on standard-
yoke-type test fixture. It provides for testing using either
ization established in the Decision on Principles for the
single- or multiple-layer specimens.
Development of International Standards, Guides and Recom-
NOTE 1—This test method has been applied only at frequencies of 50
mendations issued by the World Trade Organization Technical
and 60 Hz, but with proper instrumentation and application of the
Barriers to Trade (TBT) Committee.
principles of testing and calibration embodied in the test method, it is
believed to be adaptable to testing at frequencies ranging from 25 to
2. Referenced Documents
400Hz.
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2.1 ASTM Standards:
1.2 This test method provides a test for specific core loss,
A34/A34MPractice for Sampling and Procurement Testing
specific exciting power and ac peak permeability at moderate
of Magnetic Materials
and high flux densities, but is restricted to very soft magnetic
A340Terminology of Symbols and Definitions Relating to
materials with dc coercivities of 0.07 Oe [5.57 A/m] or less.
Magnetic Testing
1.3 Thetestmethodalsoprovidesproceduresforcalculating
A343/A343MTest Method for Alternating-Current Mag-
ac peak permeability from measured peak values of total
netic Properties of Materials at Power Frequencies Using
exciting currents at magnetic field strengths up to about 2 Oe
Wattmeter-Ammeter-Voltmeter Method and 25-cm Ep-
[159 A/m].
stein Test Frame
A876Specification for Flat-Rolled, Grain-Oriented, Silicon-
1.4 Explanation of symbols and abbreviated definitions
Iron, Electrical Steel, Fully Processed Types
appear in the text of this test method.The official symbols and
A901Specification for Amorphous Magnetic Core Alloys,
definitions are listed in Terminology A340.
Semi-Processed Types
1.5 This test method shall be used in conjunction with
A912/A912MTest Method for Alternating-Current Mag-
Practice A34/A34M.
netic Properties of Amorphous Materials at Power Fre-
1.6 The values stated in either customary (cgs-emu and
quencies Using Wattmeter-Ammeter-Voltmeter Method
inch-pound) or SI units are to be regarded separately as
with Toroidal Specimens
standard. Within this standard, SI units are shown in brackets.
3. Terminology
Thevaluesstatedineachsystemmaynotbeexactequivalents;
therefore,eachsystemshallbeusedindependentlyoftheother.
3.1 The definitions of terms, symbols, and conversion fac-
Combiningvaluesfromthetwosystemsmayresultinnoncon- tors relating to magnetic testing, used in this test method, are
formance with this standard.
found in Terminology A340.
1.7 This standard does not purport to address all of the
3.2 Definitions of Terms Specific to This Standard:
safety concerns, if any, associated with its use. It is the
3.2.1 sheet specimen—arectangularspecimencomprisedof
a single piece of material or parallel multiple strips of material
arranged in a single layer.
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This test method is under the jurisdiction of ASTM Committee A06 on
MagneticPropertiesandisthedirectresponsibilityofSubcommitteeA06.01onTest
2
Methods. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Oct. 1, 2019. Published October 2019. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1995. Last previous edition approved in 2012 as A932/A932M–01 Standards volume information, refer to the standard’s Document Summary page on
(2012). DOI:10.1520/A0932_A0932M-01R19. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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