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  • ASTM
    A773/A773M-01(2009) Standard Test Method for dc Magnetic Properties of Materials Using Ring and Permeameter Procedures with dc Electronic Hysteresigraphs
    Edition: 2009
    Unlimited Users - 1 Loc per year

Description of ASTM-A773 2009

ASTM A773 / A773M - 01(2009)

Standard Test Method for dc Magnetic Properties of Materials Using Ring and Permeameter Procedures with dc Electronic Hysteresigraphs

Active Standard ASTM A773 / A773M | Developed by Subcommittee: A06.01

Book of Standards Volume: 03.04

ASTM A773 / A773M

Significance and Use

Hysteresigraph testing permits more rapid and efficient collection of dc hysteresis ( B-H loop) data as compared to the point by point ballistic Test Methods A 341/A 341M and A 596/A 596M . The accuracy and precision of testing is comparable to the ballistic methods. Hysteresigraphs are particularly desirable for testing of semihard and hard magnetic materials where either the entire second quadrant (demagnetization curve) or entire hysteresis loop is of primary concern.

Provided the test specimen is representative of the bulk sample or lot, this test method is well suited for design, specification acceptance, service evaluation and research and development.

1. Scope

1.1 This test method provides dc hysteresigraph procedures ( B-H loop methods) for the determination of basic magnetic properties of materials in the form of ring, toroidal, link, double-lapped Epstein cores, or other standard shapes that may be cut, stamped, machined, or ground from cast, compacted, sintered, forged, or rolled materials. It includes tests for normal induction and hysteresis taken under conditions of continuous sweep magnetization. Rate of sweep may be varied, either manually or automatically at different portions of the curves during tracing. Total elapsed time for tracing a hysteresis loop is commonly 10 to 120 s per loop.

1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. 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.

1.3 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

A341/A341M Test Method for Direct Current Magnetic Properties of Materials Using D-C Permeameters and the Ballistic Test Methods

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

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


IECPublication404-4: Magnetic Materials--Part 4: Methods of Measurement of dc Magnetic Properties of Iron and Steel (1995) Available from American National Standards Institute, 25 W. 43rd St., 4th Floor, New York, NY 10036.


dc hysteresigraph; dc hysteresis; Epstein test; Hall probe; hysteresis loop; permeameter; ring-type specimen; Current measurement--direct-current; D-c magnetic properties; Direct-current permeability; Hysteresis effects; Permeameters (direct-current); Ring test procedures;

ICS Code

ICS Number Code 29.030 (Magnetic materials)

DOI: 10.1520/A0773_A0773M-01R09

ASTM International is a member of CrossRef.

ASTM A773 / A773M

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About ASTM

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.