IEC 60404-6-2003
磁性材料.第6部分:使用环形试样的频率范围在20至200kHz的软磁金属材料和粉末材料磁性能的测量方法
Magnetic materials - Part 6: Methods of measurement of the magnetic properties of magnetically soft metallic and powder materials at frequencies in the range of 20 Hz to 200 kHz by the use of ring specimens