IEC 60404-2 MAGNETIC MATERIALS -Part 2: Methods of measurement of the magnetic propertiesof electrical steel strip and sheet by means of an Epstein frame
1 scope and object
This part of lEC 60404 is applicable to grain oriented and non-oriented electrical sheet andstrip for a.c. measurements of magnetic properties at frequencies up to 400 Hz and for d.c.magnetic measurements.
The object of this part is to define the general principles and the technical details of themeasurement of the magnetic properties of electrical steel sheet and strip by means of anEpstein frame.
The Epstein frame is applicable to test specimens obtained from electrical steel sheets andstrips of any grade. The a.c. magnetic characteristics are determined for sinusoidal inducedvoltages, for specified peak values of magnetic polarization and for a specified frequency.
The measurements are to be made at an ambient temperature of (23 ±5) C on testspecimens which have first been demagnetized.
Measurements at higher frequencies are to be made in accordance with lEC 60404-10.
NOTE Throughout this standard the term "magnetic polarization" is used as defined in IEC 60050(221). In somestandards of the lEC 60404 series, the term "magnetic flux density" was used.
The following referenced documents are indispensable for the application of this document.Fordated references,only the edition cited applies. For undated references, the latest edition ofthe referenced document (including any amendments) applies.