ASTM A889/A889M-14
(Test Method)Standard Test Method for Alternating-Current Magnetic Properties of Materials at Low Magnetic Flux Density Using the Voltmeter-Ammeter-Wattmeter-Varmeter Method and 25-cm Epstein Frame
Standard Test Method for Alternating-Current Magnetic Properties of Materials at Low Magnetic Flux Density Using the Voltmeter-Ammeter-Wattmeter-Varmeter Method and 25-cm Epstein Frame
SIGNIFICANCE AND USE
3.1 This test method may be used to determine the specific core loss, specific reactive power, specific exciting power, inductance permeability, and impedance permeability of flat-rolled magnetic materials over a wide range of inductions and at frequencies up to 400 Hz for symmetrically magnetized test samples.
3.2 These measurements are used by the producer and user of the flat-rolled material for quality control purposes. The fundamental assumption inherent in these measurements is that they can be correlated with the electromagnetic characteristics of a core fabricated from the flat-rolled material.
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.
1.2 The magnetic properties of materials are determined from measurements on Epstein core specimens with the core and test coils treated as though they constituted a series-parallel equivalent circuit (Fig. A1.1) for the fundamental frequency of excitation where the apparent parallel inductance, L1, and resistance, R 1, are attributable to the test specimen.
1.3 This test method is suitable for the determination of core loss, rms volt-amperes, rms exciting current, reactive volt-amperes, and related properties of flat-rolled magnetic materials under ac magnetization.
1.4 The frequency range of this test method is normally that of the commercial power frequencies 50 to 60 Hz. It is also acceptable for measurements at frequencies from 25 to 400 Hz. This test method is customarily used on nonoriented electrical steels at inductions up to 10 kG [1.0 T] and for grain-oriented electrical steels at inductions up to 15 kG [1.5 T].
1.5 For reactive properties, both flux and current waveforms introduce limitations. Over its range of useful inductions, the varmeter is valid for the measurement of reactive volt-amperes (vars) and inductance permeability. For the measurement of these properties, it is suggested that test inductions be limited to values sufficiently low that the measured values of vars do not differ by more than 15 % (Note 1) from those calculated from the measured values of exciting volt-amperes and core loss. Note 1—This limitation is placed on this test method in consideration of the nonlinear nature of the magnetic circuit, which leads to a difference between vars based on fundamental frequency components of voltage and current and current after harmonic rejection and vars computed from rms current, voltage, and watt values when one or more of these quantities are nonsinusoidal.
1.6 This test method shall be used in conjunction with Practice A34/A34M.
1.7 Explanation of terms, symbols, and definitions used may be found in the various sections of this test method. The official list of definitions and symbols may be found in Terminology A340.
1.8 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 nonconformance with this standard.
1.9 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 its use.
General Information
Relations
Buy Standard
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: A889/A889M − 14
Standard Test Method for
Alternating-Current Magnetic Properties of Materials at Low
Magnetic Flux Density Using the Voltmeter-Ammeter-
1
Wattmeter-Varmeter Method and 25-cm Epstein Frame
This standard is issued under the fixed designationA889/A889M; 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.
current and current after harmonic rejection and vars computed from rms
1. Scope
current, voltage, and watt values when one or more of these quantities are
1.1 This test method covers tests for the magnetic properties
nonsinusoidal.
ofbasicflat-rolledmagneticmaterialsatpowerfrequencies(25
1.6 This test method shall be used in conjunction with
to 400 Hz) using a 25-cm Epstein test frame and the 25-cm
Practice A34/A34M.
double-lap-jointed core.
1.7 Explanationofterms,symbols,anddefinitionsusedmay
1.2 The magnetic properties of materials are determined
befoundinthevarioussectionsofthistestmethod.Theofficial
from measurements on Epstein core specimens with the core
list of definitions and symbols may be found in Terminology
andtestcoilstreatedasthoughtheyconstitutedaseries-parallel
A340.
equivalent circuit (Fig.A1.1) for the fundamental frequency of
excitation where the apparent parallel inductance, L , and
1
1.8 The values and equations stated in customary (cgs-emu
resistance, R , are attributable to the test specimen.
1 and inch-pound) or SI units are to be regarded separately as
standard. Within this standard, SI units are shown in brackets
1.3 Thistestmethodissuitableforthedeterminationofcore
except for the sections concerning calculations where there are
loss, rms volt-amperes, rms exciting current, reactive volt-
separate sections for the respective unit systems. The values
amperes, and related properties of flat-rolled magnetic materi-
stated in each system may not be exact equivalents; therefore,
als under ac magnetization.
each system shall be used independently of the other. Combin-
1.4 The frequency range of this test method is normally that
ingvaluesfromthetwosystemsmayresultinnonconformance
of the commercial power frequencies 50 to 60 Hz. It is also
with this standard.
acceptableformeasurementsatfrequenciesfrom25to400Hz.
1.9 This standard does not purport to address all of the
This test method is customarily used on nonoriented electrical
safety concerns, if any, associated with its use. It is the
steels at inductions up to 10 kG [1.0 T] and for grain-oriented
responsibility of the user of this standard to establish appro-
electrical steels at inductions up to 15 kG [1.5 T].
priate safety and health practices and determine the applica-
1.5 Forreactiveproperties,bothfluxandcurrentwaveforms
bility of regulatory limitations prior to its use.
introduce limitations. Over its range of useful inductions, the
varmeter is valid for the measurement of reactive volt-amperes
2. Referenced Documents
(vars) and inductance permeability. For the measurement of
2
these properties, it is suggested that test inductions be limited
2.1 ASTM Standards:
to values sufficiently low that the measured values of vars do
A34/A34M Practice for Sampling and Procurement Testing
not differ by more than 15 % (Note 1) from those calculated of Magnetic Materials
from the measured values of exciting volt-amperes and core
A340 Terminology of Symbols and Definitions Relating to
loss. Magnetic Testing
A343/A343M Test Method for Alternating-Current Mag-
NOTE 1—This limitation is placed on this test method in consideration
netic Properties of Materials at Power Frequencies Using
of the nonlinear nature of the magnetic circuit, which leads to a difference
between vars based on fundamental frequency components of voltage and Wattmeter-Ammeter-Voltmeter Method and 25-cm Ep-
stein Test Frame
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 May 1, 2014. Published May 2014. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1988. Last previous edition approved in 2008 as A889/A889M-03 Standards volume information, refer to the standard’s Document Summary page on
(2008). DOI: 10.1520/A0889_A0889M-14. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A889/A889M − 14
3. Significance and Use 6. Apparatus
3.1 This test method may be used to
...
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: A889/A889M − 03 (Reapproved 2008) A889/A889M − 14
Standard Test Method for
Alternating-Current Magnetic Properties of Materials at Low
Magnetic Flux Density Using the Voltmeter-Ammeter-
1
Wattmeter-Varmeter Method and 25-cm Epstein Frame
This standard is issued under the fixed designation A889/A889M; 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.
1.2 The magnetic properties of materials are determined from measurements on Epstein core specimens with the core and test
coils treated as though they constituted a series-parallel equivalent circuit (Fig. A1.1) for the fundamental frequency of excitation
where the apparent parallel inductance, L , and resistance, R , are attributable to the test specimen.
1 1
1.3 This test method is suitable for the determination of core loss, rms volt-amperes, rms exciting current, reactive volt-amperes,
and related properties of flat-rolled magnetic materials under ac magnetization.
1.4 The frequency range of this test method is normally that of the commercial power frequencies 50 to 60 Hz. It is also
acceptable for measurements at frequencies from 25 to 400 Hz. This test method is customarily used on nonoriented electrical
steels at inductions up to 10 kG [1.0 T] and for grain-oriented electrical steels at inductions up to 15 kG [1.5 T].
1.5 For reactive properties, both flux and current waveforms introduce limitations. Over its range of useful inductions, the
varmeter is valid for the measurement of reactive volt-amperes (vars) and inductance permeability. For the measurement of these
properties, it is suggested that test inductions be limited to values sufficiently low that the measured values of vars do not differ
by more than 15 % (Note 1) from those calculated from the measured values of exciting volt-amperes and core loss.
NOTE 1—This limitation is placed on this test method in consideration of the nonlinear nature of the magnetic circuit, which leads to a difference
between vars based on fundamental frequency components of voltage and current and current after harmonic rejection and vars computed from rms
current, voltage, and watt values when one or more of these quantities are nonsinusoidal.
1.6 This test method shall be used in conjunction with Practice A34/A34M.
1.7 Explanation of terms, symbols, and definitions used may be found in the various sections of this test method. The official
list of definitions and symbols may be found in Terminology A340.
1.8 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.nonconformance with this
standard.
1.9 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 its use.
2. Referenced Documents
2
2.1 ASTM Standards:
A34/A34M Practice for Sampling and Procurement Testing of Magnetic Materials
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 1988. Last previous edition approved in 20032008 as
A889/A889M-03. -03 (2008). DOI: 10.1520/A0889_A0889M-03R08.10.1520/A0889_A0889M-14.
2
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, re
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.