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IEC 60051-4:1984 ed4.0

Заменен
Direct acting indicating analogue electrical measuring instruments and their accessories. Part 4: Special requirements for frequency meters — 17 стр.
Applies to direct acting indicating frequency meters, and to non-interchangeable accessories used with frequency meters.
ICS
17.220.20 Measurement. Including measuring instruments, instrument transformers / Измерения электрических и магнитных величин. Включая измерительные приборы, измерительные трансформаторы