This part of IEC 60404 specifies the methods of measuring the d.c. magnetic properties of magnetically soft materials in a closed magnetic circuit using either the ring or the permea-meter methods. The ring method is suitable for use with laminated or solid ring specimens as well as ring specimens produced by sintering.
Two methods are used:
a) the ring method, particularly for magnetic field strengths of up to 10 kA/m;
b) the permeameter method for magnetic field strengths in the range 1 kA/m to 200 kA/m. NOTE The measurement of coercivity in an open magnetic circuit is specified in IEC 60404-7.
IEC 60404-4:1995 history
2008IEC 60404-4:1995/AMD2:2008 Magnetic materials - Part 4: Methods of measurement of d.c. magnetic properties of magnetially soft materials; Amendment 2
2008IEC 60404-4:2008 Magnetic materials - Part 4: Methods of measurement of d.c. magnetic properties of magnetically soft materials
2000IEC 60404-4:1995/AMD1:2000 Magnetic materials - Part 4: Methods of measurement of d.c. magnetic properties of magnetically soft materials; Amendment 1
2000IEC 60404-4:2000 Magnetic materials - Part 4: Methods of measurement of d.c. magnetic properties of magnetically soft materials
1995IEC 60404-4:1995 Magnetic materials - Part 4: Methods of measurement of d.c. magnetic properties of iron and steel
1970IEC 60404-4:1982 Magnetic materials - Part 4: Methods of measurement of the d.c. magnetic properties of solid steels