ASTM A932/A932M-01

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Designation:A 932/A932M–01
Standard Test Method for
Alternating-Current Magnetic Properties of Amorphous
Materials at Power Frequencies Using Wattmeter-Ammeter-
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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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
1.1 This test method covers tests for various magnetic 2.1 ASTM Standards:
properties of flat-cast amorphous magnetic materials at power A34/A34M Practice for Sampling and Procurement Test-
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frequencies (50 and 60 Hz) using sheet-type specimens in a ing of Magnetic Materials
yoke-type test fixture. It provides for testing using either A340 Terminology of Symbols and Definitions Relating to
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single- or multiple-layer specimens. Magnetic Testing
A343 Test Method forAlternating-Current Magnetic Prop-
NOTE 1—This test method has been applied only at frequencies of 50
ertiesofMaterialsatPowerFrequenciesUsingWattmeter-
and 60 Hz, but with proper instrumentation and application of the
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Ammeter-Voltmeter Method and 25-cm Epstein Frame
principles of testing and calibration embodied in the test method, it is
A804/A804M Test Methods for Alternating-Current Mag-
believed to be adaptable to testing at frequencies ranging from 25 to 400
Hz.
netic Properties of Materials at Power Frequencies Using
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Sheet-Type Test Specimens
1.2 This test method provides a test for specific core loss,
A 876/A 876M Specification for Flat-Rolled, Grain-
specific exciting power and ac peak permeability at moderate
Oriented, Silicon-Iron, Electrical Steel, Fully Processed
and high flux densities, but is restricted to very soft magnetic
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Types
materials with dc coercivities of 0.07 Oe [5.57 A/m] or less.
A901 Specification for Amorphous Magnetic Core Alloys,
1.3 Thetestmethodalsoprovidesproceduresforcalculating
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Semi-Processed Types
ac peak permeability from measured peak values of total
A912 Test Method forAlternating-Current Magnetic Prop-
exciting currents at magnetic field strengths up to about 2 Oe
ertiesofAmorphousMaterialsatPowerFrequenciesUsing
[159 A/m].
Wattmeter-Ammeter-Voltmeter Methods with Toroidal
1.4 Explanation of symbols and abbreviated definitions
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Specimens
appear in the text of this test method. The official symbols and
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C693 Test Method for Density of Glass by Buoyancy
definitions are listed in Terminology A340.
1.5 This test method shall be used in conjunction with
3. Terminology
Practice A34/A34M.
3.1 The definitions of terms, symbols, and conversion fac-
1.6 The values stated in either customary (cgs-emu and
tors relating to magnetic testing, used in this test method, are
inch-pound) or SI units are to be regarded separately as
found in Terminology A340.
standard. Within this standard, SI units are shown in brackets.
3.2 Definitions of Terms Specific to This Standard:
Thevaluesstatedineachsystemmaynotbeexactequivalents:
3.2.1 sheet specimen—a rectangular specimen comprised
therefore,eachsystemshallbeusedindependentlyoftheother.
of a single piece of material or parallel multiple strips of
Combining values from the two systems may result in noncon-
material arranged in a single layer.
formance with this standard.
3.2.2 specimen stack—testspecimens(asin3.2.1)arranged
1.7 This standard does not purport to address all of the
in a stack two or more layers high.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Significance and Use
priate safety and health practices and determine the applica-
4.1 This test method provides a satisfactory means of
bility of regulatory limitations prior to use.
determining various ac magnetic properties of amorphous
magnetic materials. It was developed to supplement the testing
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This test method is under the jurisdiction of ASTM Committee A06 on
MagneticPropertiesandisthedirectresponsibilityofSubcommitteeA06.01onTest
Methods.
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Current edition approved Oct. 10, 2001. Published December 2001. Originally Annual Book of ASTM Standards, Vol 03.04.
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published as A932/A932M−95. Last previous edition A932/A932M−95. Annual Book of ASTM Standards, Vol 15.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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A 932/A932M–01
of toroidal and Epstein specimens. For testing toroidal speci- because even a small amount of surface loading, twisting, or
mens of amorphous materials, refer to Test Method A912. flattening will cause a noticeable change in the measured
4.2 The pr
...