Specification for a reference zero for the calibration of pure-tone audiometers. Data for earphone coupler combinations maintained at certain standardizing laboratories.
NORMA vydaná dňa 20.9.1968
Designation standards: BS 2497-1:1968
Note: NEPLATNÁ
Publication date standards: 20.9.1968
Approximate weight : 300 g (0.66 lbs)
Country: British technical standard
Kategória: Technické normy BS