DIN EN 50065-4-1-2002
频率范围为3KHz至148.5KHz的低压电气设备信号传输.第4-1部分:低压退耦过滤器.总规范
Signalling on low-voltage electrical installations in the frequency range 3 kHz to 148,5 kHz - Part 4-1: Low voltage decoupling filters; Generic specification; German version EN 50065-4-1:2001