BS 4857-2:1978
Current
The latest, up-to-date edition.
Methods for testing and rating terminal reheat units for air distribution systems Acoustic testing and rating
Hardcopy , PDF
English
31-08-1978
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Foreword
Cooperating organizations
Method
Section one. General
1 Scope
2 References
3 Definitions
4 Nomenclature
5 General test requirements
6 Instrumentation
7 Test methods
8 Rating tests
9 Reporting of test results
Section two. Test methods
10 General
11 Application
12 Precision
13 Instrumentation
14 Installation
15 Quantities to be measured
16 Discrete frequency components
17 Method of measurement
18 Determination of sound power level
19 Background noise
Appendices
A Method of testing and rating quiet equipment
B Quiet air supply for acoustic testing and rating
Tables
1 Correction conditions for background noise
2 Range of accuracy in determining sound power levels
of broad band sources in reverberation rooms
3 Bandwidths
4 Significant discrete frequencies
5 Number of microphone stations
6 Standard deviations
7 Minimum requirements for traverse path
Figures
1 Arrangement of equipment for insertion loss test
2 Typical arrangement for unit-out test
3 End reflection correction
4 Arrangement of equipment for generated noise test;
noise radiated, in direction of outlet
5 Arrangement of equipment for generated noise test;
noise radiated, in direction of inlet
6 Arrangement of equipment for casing radiation test
7 Example of typical reference sound source
8 Extrapolation of LW data on octave bands 4, 5, 6 and
7 below minimum measurable value of 30 dB
9 Equipment for quiet air supply
Methods of testing and rating for static terminal attenuation; sound generation, upstream and downstream of the unit; radiation of sound from the casing.
| Committee |
RHE/6
|
| DevelopmentNote |
Supersedes 76/71260 DC. (07/2005) Reviewed and confirmed by BSI, December 2012. (11/2012)
|
| DocumentType |
Standard
|
| Pages |
26
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
This Part of this British Standard deals with methods of acoustic testing and rating of terminal reheat units, defined in Part 1 of the standard, for:
- static terminal attenuation;
- sound generation, upstream and downstream of the unit;
- radiation of sound from the casing.
| ISO 2204:1979 | Acoustics Guide to International Standards on the measurement of airborne acoustical noise and evaluation of its effects on human beings |
| BS 661:1969 | Glossary of acoustical terms |
| ISO/R 1680:1970 | Test code for the measurement of the airborne noise emitted by rotating electrical machinery |
| BS 4197(1967) : LATEST | A PRECISION SOUND LEVEL METER |
| PD 5686:1978 | The use of SI units |
| BS 1042(1965) : LATEST | |
| BS 2475:1964 | Specification for octave and one-third octave band-pass filters |
| BS 4857-1:1972 | Methods for testing and rating terminal reheat units for air distribution systems Thermal and aerodynamic performance |
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