Historical
IEC 60051-5 Ed. 4.0 b:1985
Direct acting indicating analogue electrical measuring instruments and their accessories. Part 5: Special requirements for phase meters, power factor meters and synchroscopes
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.
Content Provider
International Electrotechnical Commission [iec]