Defines and classifies accuracy classes, methods of determining intrinsic error and variations for measured quantity and time-keeping, lists influence quantities, electrical and mechanical requirements, marking requir...
详细信息
标准号:
BS 90-1975
Defines and classifies accuracy classes, methods of determining intrinsic error and variations for measured quantity and time-keeping, lists influence quantities, electrical and mechanical requirements, marking requirements and symbols. Concept used and effect of friction between marking device and chart explained in appendices.
Applies only to newly manufactured induction type var-hour meters for the measurement of reactive energy of frequency between 40 and 60 Hz, of an accuracy class of 3.0 for ordinary usage. Contains definitions, mechani...
详细信息
标准号:
IEC 60145-1963
Applies only to newly manufactured induction type var-hour meters for the measurement of reactive energy of frequency between 40 and 60 Hz, of an accuracy class of 3.0 for ordinary usage. Contains definitions, mechanical and electrical requirements and c
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