DIN EN 61248-2-1998 电子和电信设备的变压器和电感器.第2部份:以性能批准程序为基础的信号变压器分规范
Transformers and inductors for use in electronic and telecommunication equipment - Part 2: Sectional specification for signal transformers on the basis of the capability approval procedure (IEC 61248-2:1996); German version EN 61248-2:1997