BSI BS 89-4
BS BS 89-4 1990-AUG-31 Drect actng ndcatng analogue electrcal measurng nstruments and ther accessores — Part 4 Specfcaton for specal requrements for frequency meters
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Classification, construction, marking, electrical and mechanical requirements, and tests for analogue frequency meters. To be read in conjunction with BS 89:Part 1