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  • ASTM
    A598/A598M-02(2007) Standard Test Method for Magnetic Properties of Magnetic Amplifier Cores
    Edition: 2007
    $65.00
    Unlimited Users - 1 Loc per year

Description of ASTM-A598 2007

ASTM A598 / A598M - 02(2007)

Standard Test Method for Magnetic Properties of Magnetic Amplifier Cores

Active Standard ASTM A598 / A598M | Developed by Subcommittee: A06.01

Book of Standards Volume: 03.04




ASTM A598 / A598M

Significance and Use

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.

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 max , this test method provides procedures of determining the 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 1 , required to reset the induction in the core material past B r to a value where the total induction change, ? B 1 , becomes approximately one third of the induction change, 2 B p . It also provides procedures for determining the additional dc reset magnetic field strength, ? H , which, combined with H 1 , is the value required to reset the induction in the core material past B r to a value where the total induction change, ? B 2 , becomes approximately two thirds of the induction change 2 B p .

1.7 This test method specifies procedures for determining core gain from the corresponding biasing and induction changes, ? H and ? B .

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 A 34/A 34 .

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 A 340 .

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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

A34/A34M Practice for Sampling and Procurement Testing of Magnetic Materials

A340 Terminology of Symbols and Definitions Relating to Magnetic Testing

A596/A596M Test Method for Direct-Current Magnetic Properties of Materials Using the Ballistic Method and Ring Specimens


Keywords

core; coregain; gain factor; induction; magnetic amplifier; magnetic field strength; Amplifier electronics; Constant current flux reset test method (CCFR); Magnetic amplifier cores; Magnetic properties ;


ICS Code

ICS Number Code 29.100.10 (Magnetic components)


DOI: 10.1520/A0598_A0598M-02R07

ASTM International is a member of CrossRef.

ASTM A598 / A598M

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ASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide.