Direct acting indicating analogue electrical measuring instruments and their accessories. Part 5: Special requirements for phase meters, power factor meters and synchroscopes— 19 стр.
Applies to direct acting indicating analogue phase meters, power factor meters and synchroscopes, and to non-interchangeable accessories used with phase meters, power factor meters and synchroscopes.
17.220.20 Measurement. Including measuring instruments, instrument transformers / Измерения электрических и магнитных величин. Включая измерительные приборы, измерительные трансформаторы
