Direct acting indicating analogue electrical measuring instruments and their accessories, Specification for special requirements for phase meters, power factor meters and synchroscopes— 16 стр.
Direct acting indicating analogue electrical measuring instruments and their accessories. Special requirements for phase meters, power factor meters and synchroscopes— 22 стр.
Direct acting indicating analogue electrical measuring instruments and their accessories. Special requirements for phase meters, power factor meters and synchroscopes— 22 стр.
Direct acting indicating analogue electrical measuring instruments and their accessories, Specification for special requirements for multi-function instruments— 12 стр.