The purpose of this part of IEC 60404 is to define the method of measurement of the
magnetic flux density, magnetic polarization and the magnetic field strength and also to
determine the demagnetization curve and recoil line of permanent magnet materials, such as
those specified in lEC 60404-8-1 [1] 1, the properties of which are presumed homogeneous
throughout their volume.
The performance of a magnetic system is not only dependent on the properties of the
permanent magnet material but also on the dimensions of the system, the air-gap and other
elements of the magnetic circuit. The methods described in this part of IEC 60404 refer to the
measurement of the magnetic properties in a closed magnetic circuit.