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ASTM A 598/A 598M Document Information:
Title
Standard Test Method for Magnetic Properties of Magnetic Amplifier Cores
ASTM International
Publication Date:
Oct 10, 2002
Scope:
This test method covers the determination of the magnetic
performance of fully processed cores for magnetic amplifier-type
applications.
Tests may be conducted at excitation frequencies of 60, 400,
1600 Hz, or higher frequencies.
Permissible core sizes for this test method are limited only by
the available power supplies and the range and sensitivity of the
instrumentation.
At specified values of full-wave sinusoidal-current excitation,
Hmax, this test method provides procedures of
determining the corresponding value of maximum induction,
Bmax.
At specified values of half-wave sinusoidal-current excitation,
this test method provides procedures for determining the residual
induction, Br.
At increased specified values of half-wave sinusoidal-current
excitation, this test method provides procedures for determining
the dc reverse biasing magnetic field strength,
H1, required to reset the induction in the core
material past Br to a value where the total
induction change, ?B1, becomes approximately
one third of the induction change, 2 Bp. It
also provides procedures for determining the additional dc reset
magnetic field strength, ?H, which, combined with
H1, is the value required to reset the
induction in the core material past Br to a
value where the total induction change, ?B2,
becomes approximately two thirds of the induction change 2
Bp.
This test method specifies procedures for determining core gain
from the corresponding biasing and induction changes, ?H
and ?B.
This test method covers test procedures and requirements for
evaluation of finished cores which are to be used in
magnetic-amplifier-type applications. It is not a test for
basicmaterial magnetic properties.
This test method shall be used in conjunction with Practice A
34/A 34.
Explanations of symbols and abbreviated definitions appear in
the text of this test method. The official symbols and definitions
are listed in Terminology A 340.
The values and equations stated in customary (cgs-emu and
inch-pound) or SI units are to be regarded separately as standard.
Within this test method, 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 test
method.
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.
Keywords:
- core
- coregain
- gain factor
- induction
- magnetic amplifier
- magnetic field strength
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