ACOUSTICS. REFERENCE ZERO FOR THE CALIBRATION OF AUDIOMETRIC EQUIPMENT. PART 4: REFERENCE LEVELS FOR NARROW-BAND MASKING NOISE (ISO 389-4:1994)
STANDARD published on 18.11.1999
Designation standards: UNE-EN ISO 389-4:1999
Publication date standards: 18.11.1999
The number of pages: 13
Approximate weight : 39 g (0.09 lbs)
Country: Spanish technical standard
Category: Technical standards UNE