ICS77.040.99 CCs H 21 GB 中华人民共和国国家标准 GB/T 3658—2022 代替GB/T3658—2008 软磁金属材料和粉末冶金材料 20 Hz~100 kHz频率范围磁性能的 环形试样测量方法 Methods of measurement of the magnetic properties of magnetically soft metallic and powder materials at frequencies in the range 20 Hz to 100 kHz by the use of ring specimens (IEC 60404-6:2018,Magnetic materials- Part 6:Methods of measurement of the magnetic properties of magnetically soft metallic and powder materials at frequencies in the range 20 Hz to 100 kHz by the use of ring specimens,MOD) 2022-10-12发布 2022-10-12实施 国家市场监督管理总局 发布 国家标准化管理委员会