JSA JIS C 2550-1

Abstract

This Standard is applicable to the measuring methods of magnetic properties of grain oriented and non-oriented electrical steel strip and sheet under a.c. excitation at frequencies up to 400 Hz and those under d.c. excitation. <br>The object of this Standard is to define general principles and technical details of the measuring methods of the magnetic properties of electrical steel strip and sheet by means of an Epstein frame. <br>The Epstein frame is applicable to test specimens sampled from electrical steel strip and sheet of any grade. The a.c. magnetic properties are determined under the excitation condition that the induced voltage becomes sinusoidal (hereafter referred to as "sinusoidal magnetic flux excitation condition") by designating the peak value of magnetic flux density and the frequency. <br>The measurements are to be made at an ambient temperature of 23&#176;C &#177; 5 &#176;C on test specimens that have first been demagnetized. <br>Measurements at frequencies higher than 400 Hz are to be made as specified in <strong>JIS C 2550-3</strong> <br>NOTE 1 Although the term "magnetic polarization" defined in <strong>IEC 60050-221</strong> is used in <strong>IEC 60404-2</strong>:2008 that is the corresponding International Standard of this Standard, the term "magnetic flux density" is used in some standards of <strong>IEC 60404</strong> series. In this Standard, the latter term common in Japan is used. <br>NOTE 2 The International Standard corresponding to this Standard and the symbol of degree of correspondence are as follow. <br>IEC 60404-2 : 2008 <em>Magnetic materials - Part 2 : Methods of measurement of the magnetic properties of electrical steel strip and sheet by means of an Epstein frame</em> (MOD) <br>In addition, symbols which denote the degree of correspondence in the contents between the relevant International Standard and <strong>JIS</strong> are IDT (identical), MOD (modified), and NEQ (not equivalent) according to <strong>ISO/IEC Guide 21-1.</strong>