Acoustics. Reference zero for the calibration of audiometric equipment. Reference threshold of hearing under free-field and diffuse-field listening conditions.
NORMA vydána dne 15.4.1998
Designation standards: BS EN ISO 389-7:1998
Note: NEPLATNÁ
Publication date standards: 15.4.1998
The number of pages: 20
Approximate weight : 60 g (0.13 lbs)
Country: British technical standard
Kategorie: Technické normy BS