Standard reference zero for the calibration of pure tone air conduction audiometers. Specification for a standard reference zero at frequencies intermediate between those given in Parts 5 and 6 of BS 2497.
NORM herausgegeben am 29.2.1988
Designation standards: BS 2497-7:1988
Note: UNGÜLTIG
Publication date standards: 29.2.1988
The number of pages: 7
Approximate weight : 21 g (0.05 lbs)
Country: British technical standard
Kategorie: Technische Normen BS