DIN EN IEC 60404-3:2024-02

This part of IEC 60404 is applicable to grain-oriented and non-oriented electrical steel strip and sheet for measurement of AC magnetic properties at power frequencies. The object of this document is to define the general principles and the technical details of the measurement of the magnetic properties of electrical steel strip and sheet by means of a single sheet tester (SST). The single sheet tester is applicable to test specimens obtained from electrical steel strips and sheets of any grade. The AC magnetic characteristics are determined for sinusoidal induced voltages, for specified peak values of the magnetic polarization, for specific peak values of the magnetic field strength and for a specified frequency. The measurements are made at an ambient temperature of (23±5)°C on test specimens which have first been demagnetized. The standard differs from DIN IEC 60404-3:2010-05 and DIN IEC 60404-3 e:2010-09 as follows: a) Annex A has been revised. The procedure for determining the resistance of the yoke was added to Annex A; b) Annex B of the 2010 consolidated version referred to the calibration of the SST using the Epstein method. It has been deleted; c) Annex B (new), Annex C and Annex D have been revised; they are for information only; d) Annex C has been modified to take the new situation regarding P and R grades into account; e) Annex D has been modified to include Section D.4 on numerical air flow compensation. Typical examples of the application of this document are grain-oriented and non-oriented electrical steel strip and sheet for measurement of AC magnetic properties at power frequencies.