BS 7458-1:1991
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Test code for the measurement of airborne noise emitted by rotating electrical machinery Engineering method for free-field conditions over a reflecting plane
Hardcopy , PDF
English
28-06-1991
15-04-2000
Committees responsible
National foreword
Method
0. Introduction
1. Scope and field of application
2. References
3. Definition
4. Acoustic environment
5. Instrumentation
6. Installation and operation of the machine
7. Sound pressure levels on the measurement surface
8. Calculation of surface sound pressure level and
sound power level
9. Information to be recorded
10. Information to be reported
Annexes
A. Qualification procedures for the acoustic
environment
B. Procedures for calculating A-weighted sound power
level from octave or one-third octave band power
levels
C. Method for estimating the difference in noise
level between no-load and on-load operations
Tables
1. Uncertainty in determining sound power levels for
engineering measurements indoors or outdoors
2. Corrections for background sound pressure levels
3. Parameters for calculating A-weighted sound power
level from octave band power levels
4. Parameters for calculating A-weighted sound power
level from one-third octave band power levels
Figures
1. Procedure for fixing the measurement positions
where a side of the measurement surface exceeds 3d
2. Example of a measurement surface and measurement
positions (paths) for a small machine
3. Example of a measurement surface and measurement
positions (paths) for a long machine
4. Example of a measurement surface and measurement
positions (paths) for a large machine
5. Environmental correction, K, in decibels
Method, of engineering grade accuracy, of measuring sound pressure levels around a machine, of calculating band power levels and of determining the A-weighted sound power level.
| Committee |
EH/1
|
| DocumentType |
Standard
|
| Pages |
28
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| SupersededBy |
| Standards | Relationship |
| ISO 1680-1:1986 | Identical |
| EN 21680-1 : 1991 | Identical |
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