BS 848-2.5(2003) : 2003
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
View Superseded by
ACOUSTICS - DETERMINATION OF SOUND POWER RADIATED INTO A DUCT BY FANS AND OTHER AIR-MOVING DEVICES - IN-DUCT METHOD
23-11-2012
30-04-2010
Foreword
Introduction
1 Scope
1.1 General
1.2 Types of sound source
2 Normative references
3 Terms, definitions and symbols
4 Uncertainty of the measurement method
5 Test facilities and instrumentation
5.1 General requirements
5.2 Duct specifications
5.3 Instrumentation
5.4 System calibration
6 Test arrangement
6.1 Sampling tube mounting
6.2 Microphone position
6.3 Operating condition control equipment
7 Test procedure
7.1 Operating conditions
7.2 Sound pressure level readings
7.3 Measurements with and without flow straightener on
the outlet side
7.4 Inlet side measurements - Large fans: installation
category D (according to ISO 5801:1997)
8 Calculations
8.1 Average sound pressure level
8.2 Sound power level
9 Information to be recorded
10 Information to be reported
Annex A (normative) Determination of the combined mean flow
velocity and modal correction C[3,4]
Annex B (normative) Determination of the signal-to-noise ratio
of sound vs. turbulent pressure fluctuation in the test
duct
Annex C (normative) Computational procedures for calculating the
A-weighted sound power level from one-third-octave-band
sound power levels
Annex D (informative) Example of calculation of C[3,4] for a
given duct diameter and mean flow velocity
Annex E (informative) Guidelines for the design and construction
of an anechoic termination
Annex F (informative) Evaluation of performance of anechoic
terminations
Annex G (informative) Sampling tube information
Annex H (informative) Test method for small ducted fans
Annex I (informative) Test method for large ducted fans
Annex J (informative) Measurement of the swirl component
Bibliography
Gives a method for testing ducted fans and other air-moving devices to determine the sound power radiated into an anechoically terminated duct on the inlet and/or outlet side of the equipment.
| Committee |
EH/1/4
|
| DevelopmentNote |
Partially supersedes BS 848-2(1985). Supersedes BS EN 25136 and 00/561592 DC. (04/2003)
|
| DocumentType |
Standard
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| SupersededBy | |
| Supersedes |
| ISO 3744:2010 | Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound pressure — Engineering methods for an essentially free field over a reflecting plane |
| ISO 3743-2:1994 | Acoustics — Determination of sound power levels of noise sources using sound pressure — Engineering methods for small, movable sources in reverberant fields — Part 2: Methods for special reverberation test rooms |
| ISO 7574-4:1985 | Acoustics — Statistical methods for determining and verifying stated noise emission values of machinery and equipment — Part 4: Methods for stated values for batches of machines |
| IEC 60942:2003 | Electroacoustics - Sound calibrators |
| ISO 266:1997 | Acoustics — Preferred frequencies |
| ISO 3740:2000 | Acoustics — Determination of sound power levels of noise sources — Guidelines for the use of basic standards |
| ISO 7574-1:1985 | Acoustics — Statistical methods for determining and verifying stated noise emission values of machinery and equipment — Part 1: General considerations and definitions |
| ISO 5801:2017 | Fans — Performance testing using standardized airways |
| ISO 3746:2010 | Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound pressure — Survey method using an enveloping measurement surface over a reflecting plane |
| ISO 7574-3:1985 | Acoustics — Statistical methods for determining and verifying stated noise emission values of machinery and equipment — Part 3: Simple (transition) method for stated values for batches of machines |
| ISO 3741:2010 | Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound pressure — Precision methods for reverberation test rooms |
| ISO 7235:2003 | Acoustics — Laboratory measurement procedures for ducted silencers and air-terminal units — Insertion loss, flow noise and total pressure loss |
| ISO 3745:2012 | Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound pressure — Precision methods for anechoic rooms and hemi-anechoic rooms |
| IEC 61260:1995 | Electroacoustics - Octave-band and fractional-octave-band filters |
| IEC 60651:1979+AMD1:1993+AMD2:2000 CSV | Sound level meters |
| ISO 3743-1:2010 | Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound pressure — Engineering methods for small movable sources in reverberant fields — Part 1: Comparison method for a hard-walled test room |
| ASHRAE 74 : 1998 | METHOD OF MEASURING SOLAR-OPTICAL PROPERTIES OF MATERIALS |