IEC 60051-5 Ed. 4.0 b:1985, Direct acting indicating analogue electrical measuring instruments and their accessories. Part 5: Special requirements for ... meters, power factor meters and synchroscopes
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📖 Description
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.