BS EN ISO 389-4:1999

Acoustics. Reference zero for the calibration of audiometric equipment. Reference levels for narrow-band masking noise.

NORMA vydaná dňa 15.7.1999

The information about the standard:

Designation standards: BS EN ISO 389-4:1999
Publication date standards: 15.7.1999
The number of pages: 16
Approximate weight : 48 g (0.11 lbs)
Country: British technical standard
Kategória: Technické normy BS