BSI BS 89-5
BS BS 89-5 1990-AUG-31 Drect Actng ndcatng Analogue Electrcal Measurng nstruments and Ther Accessores Part 5 Specal Requrements for Phase Meters Power Factor Meters and Synchroscopes
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Classification, construction, marking, electrical and mechanical requirements and tests for phase meters, power factor meters and synchroscopes. To be read in conjunction with BS 89:Part 1