BS 7135-1 1989 Edition, August 31, 1989
Noise Emitted by Computer and Business Equipment Part 1: Method of Measurement of Airborne Noise
Includes all amendments and changes through Amendment 1, April 1, 1992
Additional Comments: W/D S/S BY BS EN ISO 7779
Published By:British Standards Institution (BSI)
Methods for determining the A-weighted sound power levels based on measurements in reverberant rooms or in free-field conditions over a reflecting plane, and A-weighted sound pressure levels at the operator or bystander positions.