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IEC 60404-4 Ed. 2.2 b:2008
Magnetic materials - Part 4: Methods of measurement of d.c. magnetic properties of magnetically soft materials
"Describes the terminology and two measuring methods, namely: the ring method and the permeameter method. Both methods use a test specimen in a closed magnetic circuit. Description of the test equipment and the electric circuits is given. This consolidated version consists of the second edition (1995) and its amendment 1 (2000). Therefore, no need to order amendment in addition to this publication. "
International Electrotechnical Commission [iec]