Direct acting indicating analogue electrical measuring instruments and their accessories. Part 3: Special requirements for wattmeters and varmeters— 25 стр.
Applies to direct acting indicating wattmeters and varmeters having an analogue display, and to non-interchangeable accessories used with wattmeters and varmeters.
17.220.20 Measurement. Including measuring instruments, instrument transformers / Измерения электрических и магнитных величин. Включая измерительные приборы, измерительные трансформаторы
