IEC 60404-10:2016

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 General principle of a.c. measurements
5 Procedure for the determination of the specific
  total loss
6 Procedure for the determination of the peak
  value of magnetic polarization, r.m.s. value of
  magnetic field strength, peak value of magnetic
  field strength and specific apparent power
7 Test report
Annex A (informative) - Epstein frame for use
        at medium frequencies
Annex B (informative) - Digital sampling method
        for the determination of the magnetic
        properties
Bibliography

IEC 60404-10:2016(E) is applicable to grain-oriented and non-oriented electrical steel strip and sheet for measurements of a.c. magnetic properties in the frequency range 400 Hz to 10 000 Hz. The object of this document is to define the general principles and the technical details of the measurement of magnetic properties of electrical steel strip and sheet by means of an Epstein frame. This edition includes the following significant technical changes with respect to the previous edition:
a) adaption to modern measurement and evaluation methods, in particular the introduction of the widely spread digital sampling method for the acquisition and evaluation of the measured data;
b) introduction of formal changes which adapt this standard to other standards of the 60404 series;
c) revision of the problem of the air flux compensation taking account of the condition of the higher frequencies;
d) revision of the capacitive coupling of mutual inductor windings together with the consideration of the alternative method of numerical air flux compensation.
The contents of the corrigendum of March 2018 have been included in this copy.