DIN EN 60404-11:2013-12

This International Standard is intended to define a measurement method for the determination of the characteristics of surface insulation resistance of magnetic sheet and strip. The method outlined here is applicable to magnetic sheet and strip insulated on one or both surfaces and is suitable for manufacturing control in the application of insulation coatings. The principle of the measurement is based on, and includes, the method originally described by Franklin (see Franklin, R.F., "Measurement and control of interlaminar resistance of laminated magnetic cores", ASTM Bulletin, no. 144, January 1947, page 57) which characterizes only one coated surface at a time. The arrangement of the apparatus is designed so that ten metallic contacts of fixed area are applied to one coated surface of the sheet, under specified conditions of voltage and pressure. The effectiveness of the surface insulation is assessed by the measurement of the currents through the ten contacts. Each contact electrode is supplied separately by a direct current power supply, in one of the two ways which are characterized by the two measurement methods used in this standard. The responsible committee is DKE/K171 "Magnetische Legierungen und Stahl" ("Magnetic alloys and steel") of the DKE German Commission for Electrical, Electronic and Information Technologies at DIN and VDE.