DIN IEC 60740-2:1995 电信和电子设备变压器和电感器铁芯片.第2部分:软磁金属材料制铁芯片最小漏磁性规范
Laminations for transformers and inductors for use in telecommunication and electronic equipment - Part 2: Specification for the minimum permeabilities of laminations made of soft magnetic metallic materials (IEC 60740-2:1993)