UNE 74020:1991

ACOUSTICS. STANDARD REFERENCE ZERO FOR THE CALIBRATION OF PURE TONE AIR CONDUCTION AUDIOMETERS.

STANDARD published on 9.9.1991

Spanish -
electronic design (pdf) (67.70 USD)

The information about the standard:

Designation standards: UNE 74020:1991
Note: WITHDRAWN
Publication date standards: 9.9.1991
The number of pages: 14
Approximate weight : 42 g (0.09 lbs)
Country: Spanish technical standard
Category: Technical standards UNE