Historical
IEC 60051-3 Ed. 4.0 b:1984
Direct acting indicating analogue electrical measuring instruments and their accessories. Part 3: Special requirements for wattmeters and varmeters
Applies to direct acting indicating wattmeters and varmeters having an analogue display, and to non-interchangeable accessories used with wattmeters and varmeters.
Content Provider
International Electrotechnical Commission [iec]