This part of IEC 404 specifies the methods of measuring the d.c. magnetic properties of iron and steel in a closed magnetic circuit using either the ring or the permeameter methods.
DS/EN 60404-4:1998 history
2009DS/EN 60404-4/A2:2009 Magnetic materials - Part 4: Methods of measurement of d.c. magnetic properties of magnetically soft materials
2002DS/EN 60404-4/A1:2002 Magnetic materials - Part 4: Methods of measurement of d.c. magnetic properties of magnetically soft materials
1998DS/EN 60404-4:1998 Magnetic materials - Part 4: Methods of measurement of d.c. magnetic properties of iron and steel