
Acoustics — Reference zero for the calibration of audiometric equipment — Part 9: Preferred test conditions for the determination of reference hearing threshold levels
NORMA vydaná dňa 7.5.2009
Designation standards: ISO 389-9:2009
Publication date standards: 7.5.2009
The number of pages: 9
Approximate weight : 27 g (0.06 lbs)
Country: International technical standard
Kategória: Technické normy ISO