Specification for direct-acting electrical recording instruments and their accessories.
NORMA vydaná dňa 28.2.1975
Označenie normy: BS 90:1975
Dátum vydania normy: 28.2.1975
Počet strán: 50
Približná hmotnosť: 150 g (0.33 libier)
Krajina: Britská technická norma
Kategória: Technické normy BS
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. Status: Confirmed