The purpose of this standard is to define methods for measuring magnetic east density, magnetic polarization, and magnetic field strength, as well as the measurement of demagnetization curves and recoil curves of permanent magnetic materials assumed to be homogeneous throughout the volume, as specified in JIS C 2502. It is to be. The performance of a magnetic device depends not only on the magnetic properties of the permanent magnet material, but also on the device, gaps, and other dimensions. The method described in this standard is the measurement of magnetic properties in a closed magnetic circuit approximating a ring.