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 3746:2010 specifies methods for determining the sound power level or sound energy level of a noise source from sound pressure levels measured on a surface enveloping a noise source (machinery or equipment) in a test environment for which requirements are given. The sound power level (or, in the case of noise bursts or transient noise emission, the sound energy level) produced by the noise source with frequency A-weighting applied is calculated using those measurements.
The methods specified in ISO 3746:2010 are suitable for all types of noise (steady, non-steady, fluctuating, isolated bursts of sound energy, etc.) defined in ISO 12001.
ISO 3746:2010 is applicable to all types and sizes of noise source (e.g. stationary or slowly moving plant, installation, machine, component or sub-assembly), provided the conditions for the measurements can be met.
The test environments that are applicable for measurements made in accordance with ISO 3746:2010 can be located indoors or outdoors, with one or more sound-reflecting planes present on or near which the noise source under test is mounted.
Information is given on the uncertainty of the sound power levels and sound energy levels determined in accordance with ISO 3746:2010, for measurements made with frequency A-weighting applied. The uncertainty conforms with that of ISO 12001:1996, accuracy grade 3 (survey grade).
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1 Scope
1.1 General
1.2 Types of noise and noise sources
1.3 Test environment
1.4 Measurement uncertainty
2 Normative references
3 Terms and definitions
4 Test environment
4.1 General
4.2 Criterion for background noise
4.3 Criterion for acoustic adequacy of test environment
5 Instrumentation
5.1 General
5.2 Calibration
6 Definition, location, installation and operation of noise source under test
6.1 General
6.2 Auxiliary equipment
6.3 Noise source location
6.4 Mounting of the noise source
6.4.1 General
6.4.2 Hand-held machinery and equipment
6.4.3 Base-mounted, wall-mounted and tabletop machinery and equipment
6.5 Operation of source during test
7 Reference box and measurement surface
7.1 Reference box
7.2 Measurement surface
7.2.1 General
7.2.2 Microphone orientation
7.2.3 Hemispherical measurement surface
7.2.4 Parallelepiped measurement surface
8 Determination of sound power levels and sound energy levels
8.1 Determination of environmental correction
8.2 Microphone positions on the measurement surface
8.2.1 Hemispherical measurement surface
8.2.2 Parallelepiped measurement surface
8.2.3 Reduction in the number of microphone positions
8.3 Determination of sound power levels
8.3.1 Measurement of sound pressure levels
8.3.2 Calculation of mean time-averaged sound pressure levels
8.3.3 Corrections for background noise
8.3.4 Calculation of surface time-averaged sound pressure level
8.3.5 Calculation of sound power levels
8.4 Determination of sound energy levels
8.4.1 Measurement of single event time-integrated sound pressure levels
8.4.2 Corrections for background noise
8.4.3 Calculation of surface single event time-integrated sound pressure levels
8.4.4 Calculation of sound energy levels
9 Measurement uncertainty
9.1 Methodology
9.2 Determination of (omc
9.3 Determination of (R0
9.3.1 General
9.3.2 Round robin test
9.3.3 Modelling approach for (R0
9.4 Typical upper bound values of (R0
9.5 Total standard deviation (tot and expanded measurement uncertainty U
10 Information to be recorded
10.1 General
10.2 Noise source under test
10.3 Test environment
10.4 Instrumentation
10.5 Acoustical data
11 Test report
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1 Scope
1.1 General
1.2 Types of noise and noise sources
1.3 Test environment
1.4 Measurement uncertainty
2 Normative references
3 Terms and definitions
4 Test environment
4.1 General
4.2 Criterion for background noise
4.3 Criterion for acoustic adequacy of test environment
5 Instrumentation
5.1 General
5.2 Calibration
6 Definition, location, installation and operation of noise source under test
6.1 General
6.2 Auxiliary equipment
6.3 Noise source location
6.4 Mounting of the noise source
6.4.1 General
6.4.2 Hand-held machinery and equipment
6.4.3 Base-mounted, wall-mounted and tabletop machinery and equipment
6.5 Operation of source during test
7 Reference box and measurement surface
7.1 Reference box
7.2 Measurement surface
7.2.1 General
7.2.2 Microphone orientation
7.2.3 Hemispherical measurement surface
7.2.4 Parallelepiped measurement surface
8 Determination of sound power levels and sound energy levels
8.1 Determination of environmental correction
8.2 Microphone positions on the measurement surface
8.2.1 Hemispherical measurement surface
8.2.2 Parallelepiped measurement surface
8.2.3 Reduction in the number of microphone positions
8.3 Determination of sound power levels
8.3.1 Measurement of sound pressure levels
8.3.2 Calculation of mean time-averaged sound pressure levels
8.3.3 Corrections for background noise
8.3.4 Calculation of surface time-averaged sound pressure level
8.3.5 Calculation of sound power levels
8.4 Determination of sound energy levels
8.4.1 Measurement of single event time-integrated sound pressure levels
8.4.2 Corrections for background noise
8.4.3 Calculation of surface single event time-integrated sound pressure levels
8.4.4 Calculation of sound energy levels
9 Measurement uncertainty
9.1 Methodology
9.2 Determination of (omc
9.3 Determination of (R0
9.3.1 General
9.3.2 Round robin test
9.3.3 Modelling approach for (R0
9.4 Typical upper bound values of (R0
9.5 Total standard deviation (tot and expanded measurement uncertainty U
10 Information to be recorded
10.1 General
10.2 Noise source under test
10.3 Test environment
10.4 Instrumentation
10.5 Acoustical data
11 Test report