BSI BS 89-3
BS BS 89-3 1990-AUG-31 Drect actng ndcatng analogue electrcal measurng nstruments and ther accessores — Part 3 Specfcaton for specal requrements for wattmeters and varmeters-AMD 8749 August 15 1995
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Classification, construction, marking, electrical and mechanical requirements, and tests for analogue wattmeters and varmeters. To be read in conjunction with BS 89:Part 1