ASTM A598/A598M-02(2015)

Standard Test Method for Magnetic Properties of Magnetic Amplifier Cores

SIGNIFICANCE AND USE
5.1 The method of excitation simulates, to a practical degree, the operation of a magnetic core in a self-saturating magnetic amplifier. The properties measured are related to the quality of performance of the cores in magnetic amplifiers and are useful for the specification of materials for such cores.
SCOPE
1.1 This test method covers the determination of the magnetic performance of fully processed cores for magnetic amplifier-type applications.  
1.2 Tests may be conducted at excitation frequencies of 60, 400, 1600 Hz, or higher frequencies.  
1.3 Permissible core sizes for this test method are limited only by the available power supplies and the range and sensitivity of the instrumentation.  
1.4 At specified values of full-wave sinusoidal-current excitation, Hmax, this test method provides procedures of determining the corresponding value of maximum induction, Bmax.  
1.5 At specified values of half-wave sinusoidal-current excitation, this test method provides procedures for determining the residual induction, Br.  
1.6 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, ΔB1, becomes approximately one third of the induction change, 2 Bp. It also provides procedures for determining the additional dc reset magnetic field strength, ΔH, 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, ΔB2, becomes approximately two thirds of the induction change 2 Bp.  
1.7 This test method specifies procedures for determining core gain from the corresponding biasing and induction changes, ΔH and ΔB.  
1.8 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 basic-material magnetic properties.  
1.9 This test method shall be used in conjunction with Practice A34/A34M.  
1.10 Explanations of symbols and abbreviated definitions appear in the text of this test method. The official symbols and definitions are listed in Terminology A340.  
1.11 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.  
1.12 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.

General Information

• Status: Historical
• Publication Date: 31-Mar-2015
• ICS: 29.100.10 - Magnetic components
• Technical Committee: A06 - Magnetic Properties
• Drafting Committee: A06.01 - Test Methods

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:A598/A598M −02 (Reapproved 2015)
Standard Test Method for
1
Magnetic Properties of Magnetic Amplifier Cores
This standard is issued under the fixed designationA598/A598M; 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 1.9 This test method shall be used in conjunction with
Practice A34/A34M.
1.1 This test method covers the determination of the mag-
netic performance of fully processed cores for magnetic
1.10 Explanations of symbols and abbreviated definitions
amplifier-type applications.
appear in the text of this test method.The official symbols and
definitions are listed in Terminology A340.
1.2 Tests may be conducted at excitation frequencies of 60,
400, 1600 Hz, or higher frequencies.
1.11 Thevaluesandequationsstatedincustomary(cgs-emu
1.3 Permissible core sizes for this test method are limited
and inch-pound) or SI units are to be regarded separately as
only by the available power supplies and the range and
standard. Within this test method, SI units are shown in
sensitivity of the instrumentation.
brackets. The values stated in each system may not be exact
1.4 At specified values of full-wave sinusoidal-current
equivalents;therefore,eachsystemshallbeusedindependently
excitation, H , this test method provides procedures of
of the other. Combining values from the two systems may
max
determining the corresponding value of maximum induction,
result in nonconformance with this test method.
B .
max
1.12 This standard does not purport to address all of the
1.5 At specified values of half-wave sinusoidal-current
safety concerns, if any, associated with its use. It is the
excitation, this test method provides procedures for determin-
responsibility of the user of this standard to establish appro-
ing the residual induction, B .
r
priate safety and health practices and determine the applica-
1.6 At increased specified values of half-wave sinusoidal- bility of regulatory limitations prior to use.
current excitation, this test method provides procedures for
determining the dc reverse biasing magnetic field strength, H ,
2. Referenced Documents
1
required to reset the induction in the core material past B to a
r
2
2.1 ASTM Standards:
valuewherethetotalinductionchange,∆B ,becomesapproxi-
1
A34/A34MPractice for Sampling and Procurement Testing
matelyonethirdoftheinductionchange,2 B .Italsoprovides
p
of Magnetic Materials
procedures for determining the additional dc reset magnetic
A340Terminology of Symbols and Definitions Relating to
field strength, ∆H, which, combined with H , is the value
1
Magnetic Testing
required to reset the induction in the core material past B to a
r
A596/A596MTest Method for Direct-Current Magnetic
valuewherethetotalinductionchange,∆B ,becomesapproxi-
2
mately two thirds of the induction change 2 B . Properties of Materials Using the Ballistic Method and
p
Ring Specimens
1.7 This test method specifies procedures for determining
core gain from the corresponding biasing and induction
3. Terminology
changes, ∆H and ∆B.
3.1 Definitions—Below is a list of symbols and definitions
1.8 This test method covers test procedures and require-
as used in this test method. The official list of symbols and
ments for evaluation of finished cores which are to be used in
definitions may be found in Terminology A340. (See Table 1
magnetic-amplifier-type applications. It is not a test for basic-
material magnetic properties. where indicated).
3.2 Symbols:
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 April 1, 2015. Published April 2015. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 1969. Last previous edition approved in 2007 as A598/A598M–02 Standards volume information, refer to the standard’s Document Summary page on
(2007). DOI: 10.1520/A0598_A0598M-02R15. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
A598/A598M−02 (2015)
TABLE 1 Standard Values of ∆B, ∆B,and ∆B for the Commonly Used Materials
1 2
∆ B (for Test of 10.5) ∆ B (for Test of 10.4) ∆ B or
1 2
A
(∆B −∆B )
Core Material 2 1
kG Tesla kG Tesla kG Tesla
Supermendur 14 1.4 28 2.8 14 1.4
Oriented silicon-iron 10 1.0 20 2.0 10 1.0
50 % nickel-iron:
Oriented 10 1.0 20 2.0 10 1.0
Nonoriented 8 0.8 16 1.6 8 0.8
79 % nickel-iron 5 0.5 10 1.0 5 0.5
S
...

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: A598/A598M − 02 (Reapproved 2007) A598/A598M − 02 (Reapproved 2015)
Standard Test Method for
1
Magnetic Properties of Magnetic Amplifier Cores
This standard is issued under the fixed designation A598/A598M; 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 the determination of the magnetic performance of fully processed cores for magnetic amplifier-type
applications.
1.2 Tests may be conducted at excitation frequencies of 60, 400, 1600 Hz, or higher frequencies.
1.3 Permissible core sizes for this test method are limited only by the available power supplies and the range and sensitivity
of the instrumentation.
1.4 At specified values of full-wave sinusoidal-current excitation, H , this test method provides procedures of determining the
max
corresponding value of maximum induction, B .
max
1.5 At specified values of half-wave sinusoidal-current excitation, this test method provides procedures for determining the
residual induction, B .
r
1.6 At increased specified values of half-wave sinusoidal-current excitation, this test method provides procedures for
determining the dc reverse biasing magnetic field strength, H , required to reset the induction in the core material past B to a value
1 r
where the total induction change, ΔB , becomes approximately one third of the induction change, 2 B . It also provides procedures
1 p
for determining the additional dc reset magnetic field strength, ΔH, , which, combined with H , is the value required to reset the
1
induction in the core material past B to a value where the total induction change, ΔB , becomes approximately two thirds of the
r 2
induction change 2 B .
p
1.7 This test method specifies procedures for determining core gain from the corresponding biasing and induction changes, ΔH
and ΔB.
1.8 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 basic-material magnetic properties.
1.9 This test method shall be used in conjunction with Practice A34/A34M.
1.10 Explanations of symbols and abbreviated definitions appear in the text of this test method. The official symbols and
definitions are listed in Terminology A340.
1.11 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.
1.12 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
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, 2007April 1, 2015. Published January 2008April 2015. Originally approved in 1969. Last previous edition approved in 20022007 as
A598/A598M–02. –02 (2007). DOI: 10.1520/A0598_A0598M-02R07.10.1520/A0598_A0598M-02R15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM 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 ----------------------
A598/A598M − 02 (2015)
A596/A596M Test Method for Direct-Current Magnetic Properties of Materials Using the Ballistic Method and Ring Specimens
3. Terminology
3.1 Definitions—Below is a list of symbols and definitions as used in this test method. The official list of symbols and definitions
may be found in Terminology A340. (See Ta
...