ASTM A912/A912M-11
(Test Method)Standard Test Method for Alternating-Current Magnetic Properties of Amorphous Materials at Power Frequencies Using Wattmeter-Ammeter-Voltmeter Method with Toroidal Specimens
Standard Test Method for Alternating-Current Magnetic Properties of Amorphous Materials at Power Frequencies Using Wattmeter-Ammeter-Voltmeter Method with Toroidal Specimens
SIGNIFICANCE AND USE
This test method provides a satisfactory means of determining various ac magnetic properties of amorphous magnetic materials.
The procedures described herein are suitable for use by producers and users of magnetic materials for materials specification acceptance and manufacturing control.
The procedures described herein may be adapted for use with specimens of other alloys and other toroidal forms.
SCOPE
1.1 This test method covers tests for various magnetic properties of amorphous materials at power frequencies [25 to 400 Hz] using a toroidal test transformer. The term “toroidal test transformer” is used to describe the test device, reserving the term “specimen” to refer to the material used in the test. The test specimen consists of toroidally wound flat strip.
1.2 This test method covers the determination of core loss, exciting power, rms and peak exciting current, several types of ac permeability, and related properties under ac magnetization at moderate and high inductions at power frequencies [25 to 70 Hz].
1.3 With proper instrumentation and specimen preparation, this test method is acceptable for measurements at frequencies from 5 Hz to 100 kHz. Proper instrumentation implies that all test instruments have the required frequency bandwidth. Also see Annex A2.
1.4 This test method also provides procedures for calculating impedance permeability from measured values of rms exciting current and for calculating ac peak permeability from measured peak values of total exciting current at magnetic field strengths up to about 10 Oe [796 A/m].
1.5 Explanations of symbols and brief definitions appear in the text of this test method. The official symbols and definitions are listed in Terminology A340.
1.6 This test method shall be used in conjunction with Practice A34/A34M.
1.7 The values and equations stated in customary (cgs-emu and inch-pound) units 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.
1.8 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: A912/A912M − 11
Standard Test Method for
Alternating-Current Magnetic Properties of Amorphous
Materials at Power Frequencies Using Wattmeter-Ammeter-
1
Voltmeter Method with Toroidal Specimens
This standard is issued under the fixed designationA912/A912M; 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 of the other. Combining values from the two systems may
result in nonconformance with this standard.
1.1 This test method covers tests for various magnetic
1.8 This standard does not purport to address all of the
properties of amorphous materials at power frequencies [25 to
safety concerns, if any, associated with its use. It is the
400 Hz] using a toroidal test transformer. The term “toroidal
responsibility of the user of this standard to establish appro-
test transformer” is used to describe the test device, reserving
priate safety and health practices and determine the applica-
the term “specimen” to refer to the material used in the test.
bility of regulatory limitations prior to use.
The test specimen consists of toroidally wound flat strip.
1.2 This test method covers the determination of core loss,
2. Referenced Documents
exciting power, rms and peak exciting current, several types of
2
2.1 ASTM Standards:
ac permeability, and related properties under ac magnetization
A34/A34MPractice for Sampling and Procurement Testing
atmoderateandhighinductionsatpowerfrequencies[25to70
of Magnetic Materials
Hz].
A340Terminology of Symbols and Definitions Relating to
1.3 With proper instrumentation and specimen preparation,
Magnetic Testing
this test method is acceptable for measurements at frequencies
A343/A343MTest Method for Alternating-Current Mag-
from 5 Hz to 100 kHz. Proper instrumentation implies that all
netic Properties of Materials at Power Frequencies Using
test instruments have the required frequency bandwidth. Also
Wattmeter-Ammeter-Voltmeter Method and 25-cm Ep-
see Annex A2.
stein Test Frame
1.4 This test method also provides procedures for calculat- A901Specification for Amorphous Magnetic Core Alloys,
ing impedance permeability from measured values of rms
Semi-Processed Types
exciting current and for calculating ac peak permeability from C693Test Method for Density of Glass by Buoyancy
measuredpeakvaluesoftotalexcitingcurrentatmagneticfield
3. Significance and Use
strengths up to about 10 Oe [796 A/m].
3.1 This test method provides a satisfactory means of
1.5 Explanations of symbols and brief definitions appear in
determining various ac magnetic properties of amorphous
thetextofthistestmethod.Theofficialsymbolsanddefinitions
magnetic materials.
are listed in Terminology A340.
3.2 The procedures described herein are suitable for use by
1.6 This test method shall be used in conjunction with
producers and users of magnetic materials for materials speci-
Practice A34/A34M.
fication acceptance and manufacturing control.
1.7 The values and equations stated in customary (cgs-emu
3.3 Theproceduresdescribedhereinmaybeadaptedforuse
and inch-pound) units or SI units are to be regarded separately
with specimens of other alloys and other toroidal forms.
as standard. Within this standard, SI units are shown in
brackets. The values stated in each system may not be exact
4. Interferences
equivalents;therefore,eachsystemshallbeusedindependently
4.1 Test methods using toroidal test transformers are espe-
cially useful for evaluating the magnetic properties of a
1
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, 2011. Published November 2011. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1992. Last previous edition approved in 2004 as A912/A912M–04. Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/A0912_A0912M-11. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A912/A912M − 11
material. There are, however, several important requirements 5.3.1.1 Theelectricalimpedanceandaccuracyrequirements
to be met when determining the material characteristics. are given in 5.3.2 – 5.5.2. The operating principles for the
4.1.1 Theratioofinsidetooutsidediametermustbe0.82or various instruments are not specified.
greater, or the magnetic field strength will be excessively 5.3.
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:A912/A912M–04 Designation:A912/A912M–11
Standard Test Method for
Alternating-Current Magnetic Properties of Amorphous
Materials at Power Frequencies Using Wattmeter-Ammeter-
1
Voltmeter Method with Toroidal Specimens
This standard is issued under the fixed designationA912/A912M; 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
1.1 This test method covers tests for various magnetic properties of amorphous materials at power frequencies [25 to 400 Hz]
using a toroidal test transformer. The term “toroidal test transformer” is used to describe the test device, reserving the term
“specimen” to refer to the material used in the test. The test specimen consists of toroidally wound flat strip.
1.2 This test method covers the determination of core loss, exciting power, rms and peak exciting current, several types of ac
permeability, and related properties under ac magnetization at moderate and high inductions at power frequencies [25 to 70 Hz].
1.3 Withproperinstrumentationandspecimenpreparation,thistestmethodisacceptableformeasurementsatfrequenciesfrom
5 Hz to 100 kHz. Proper instrumentation implies that all test instruments have the required frequency bandwidth.Also seeAnnex
A2.
1.4 This test method also provides procedures for calculating impedance permeability from measured values of rms exciting
current and for calculating ac peak permeability from measured peak values of total exciting current at magnetizing forces
magnetic field strengths up to about 10 Oe [796 A/m].
1.5 Explanations of symbols and brief definitions appear in the text of this test method.The official symbols and definitions are
listed in Terminology A340.
1.6 This test method shall be used in conjunction with Practice A34/A34M.
1.7 The values and equations stated in customary (cgs-emu and inch-pound) units 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.
1.8 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
2
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
A343/A343M Test Method for Alternating-Current Magnetic Properties of Materials at Power Frequencies Using Wattmeter-
Ammeter-Voltmeter Method and 25-cm Epstein Test Frame
A901 Specification for Amorphous Magnetic Core Alloys, Semi-Processed Types
C693 Test Method for Density of Glass by Buoyancy
3. Significance and Use
3.1 This test method provides a satisfactory means of determining various ac magnetic properties of amorphous magnetic
materials.
3.2 The procedures described herein are suitable for use by manufacturersproducers and users of magnetic materials for
1
This test method is under the jurisdiction ofASTM CommitteeA06 on Magnetic Properties and is the direct responsibility of SubcommitteeA06.01 on Test Methods.
Current edition approved May 1, 2004. Published May 2004. Originally approved in 1992. Last previous edition approved in 1998 as A912–93 (1998). DOI:
10.1520/A0912_A0912M-04.
Current edition approved Oct. 1, 2011. Published November 2011. Originally approved in 1992. Last previous edition approved in 2004 as A912/A912M–04. DOI:
10.1520/A0912_A0912M-11.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.For Annual Book ofASTM 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 ----------------------
A912/A912M–11
materials specification acceptance and manufacturing control.
3.3 The procedures described herein may be adapted for use with specimens of other alloys and other toroidal forms.
4. I
...
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