Acoustics - Reference zero for the calibration of audiometric equipment - Part 1: Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones (ISO 389-1:2017)
NORMA vydaná dňa 6.3.2019
Designation standards: UNE-EN ISO 389-1:2019
Publication date standards: 6.3.2019
The number of pages: 19
Approximate weight : 57 g (0.13 lbs)
Country: Spanish technical standard
Kategória: Technické normy UNE