Historical
IEC 60404-4 Ed. 2.1 b:2000
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.
International Electrotechnical Commission [iec]