Defines and classifies instruments using a null balance method and needing an auxiliary electrical supply. Permissible intrinsic errors, reference conditions and variations for measured quantity and time-keeping for recording instruments. Also electrical, mechanical, constructional and marking requirements.
BS 5164:1975 history
0000 BS 5164:1975(2011)
1975BS 5164:1975 Specification for indirect-acting electrical indicating and recording instruments and their accessories