DIN EN 62053-31-1999 电能测量设备(AC).特殊要求.第31部分:感应计数器或电子计数器(只限于双线系统)用脉冲输出装置
Electricity metering equipment (a.c.) - Particular requirements - Part 31: Pulse output devices for electromechanical and electronic meters (two wires only) (IEC 62053-31:1998); German version EN 62053-31:1998