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ASTM A804/A804M-99

Historical Revision

Standard Test Methods for Alternating-Current Magnetic Properties of Materials at Power Frequencies Using Sheet-Type Test Specimens

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1.1 These test methods cover the determination of specific core loss and peak permeability of single layers of sheet-type specimens tested with normal excitation at a frequency of 50 or 60 Hz.

Note 1-These test methods have been applied only at the commercial power frequencies, 50 and 60 Hz, but with proper instrumentation and application of the principles of testing and calibration embodied in the test methods, they are believed to be adaptable to testing at frequencies ranging from 25 to 400 Hz.

1.2 These test methods employ calibration procedures that provide correlation with the 25-cm [250-mm] Epstein test.

1.3 The range of test inductions is governed by the properties of the test specimen and by the available instruments and other equipment components. Normally, nonoriented electrical steels can be tested over a range from 8 to 16 kG [0.8 to 1.6 T] for core loss. For oriented electrical steels, the normal range extends to 18 kG [1.8 T]. Maximum inductions in peak permeability testing are limited principally by heating of the magnetizing winding and tests are limited normally to a maximum a-c magnetizing force of about 150 Oe [12 000 A/m].

1.4 These test methods cover two alternative procedures as follows:

Test Method 1-Sections 6 to 12 Test Method 2-Sections 13 to 19

SDO ASTM: ASTM International
Document Number A804
Publication Date May 10, 1999
Language en - English
Page Count 15
Revision Level 99
Supercedes
Committee A06.01
Publish Date Document Id Type View
May 1, 2004 A0804_A0804M-04 Revision
May 10, 1999 A0804_A0804M-99 Revision
Feb. 1, 2021 A0804_A0804M-04R21 Reaffirmation
Oct. 1, 2015 A0804_A0804M-04R15 Reaffirmation
May 1, 2009 A0804_A0804M-04R09E01 Reaffirmation