Acoustics - Reference zero for the calibration of audiometric equipment - Part 7: Reference threshold of hearing under free-field and difuse-field listening conditions
NORM herausgegeben am 1.12.1998
Designation standards: ČSN EN ISO 389-7
Classification mark: 011630
Catalog number: 54343
Note: UNGÜLTIG
Publication date standards: 1.12.1998
The number of pages: 16
Approximate weight : 48 g (0.11 lbs)
Country: Czech technical standard
Kategorie: Technische Normen ČSN