
Acoustics—Reference zero for the calibration of audiometric equipment—Part 1:Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones
NORM herausgegeben am 8.3.1999
Designation standards: GB/T 4854.1-1999
Note: UNGÜLTIG
Publication date standards: 8.3.1999
Country: Chinese technical standard
Kategorie: Technische Normen GB