DS DS/EN 60051-4
DS DSEN 60051-4 1995-DEC-07 Drect actng ndcatng analogue electrcal measurng nstruments and ther accessores - Part 4 Specal requrements for frequency meters
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Part 4 of this standard applies to direct acting indicating analogue frequency meters. This part also applies to non-interchangeable accessories used with frequency meters.