BS 7135-2:1989
Withdrawn
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Noise emitted by computer and business equipment Method of measurement of high-frequency noise
Hardcopy , PDF
10-26-2018
English
09-29-1989
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National foreword
Committees responsible
Method
0 Introduction
1 Scope and field of application
2 References
3 Requirements for measurements in a reverberation
room
4 Method using measured reverberation time
5 Method using calculated air absorption
6 Method using a reference sound source
7 Method using a free field over a reflecting plane
8 Calculation of A-weighted sound power level
9 Information to be recorded
10 Information to be reported
Annexes
A Coaxial circular paths in parallel planes for
microphone traverses in a free field over a
reflecting plane
B Calculation of air absorption coefficient
Tables
1 Air absorption coefficients
2 Values of the A-weighting factor, Aj, for j = 1 to
24
3 Type of noise and determination of sound power
levels
Figure
A.1 Circular paths for microphone traverses
Four methods for determining the sound power levels of high-frequency noise in the octave band centred at 16 Hz, three based in the reverberation room technique and on in free-field conditions over a reflecting plane.
| Committee |
EH/1
|
| DevelopmentNote |
Also numbered as EN 29295. Supersedes 86/51427 DC (09/2005)
|
| DocumentType |
Standard
|
| Pages |
20
|
| PublisherName |
British Standards Institution
|
| Status |
Withdrawn
|
| SupersededBy |
| Standards | Relationship |
| SNV DIN EN 29295 : 1991 | Identical |
| SNV NF EN 29295 : 1992 | Identical |
| BS 7135-1:1989 | Noise emitted by computer and business equipment Method of measurement of airborne noise |
| ISO 6926:2016 | Acoustics Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels |
| BS 7135-1:1989 | Noise emitted by computer and business equipment Method of measurement of airborne noise |
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