ASA S12.56 2011
$85.04
ANSI/ASA S12.56-2011 / ISO 3746:2010 (R2016) American National Standard 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 (a nationally adopted international standard)
| Published By | Publication Date | Number of Pages |
| ASA | 2011 | 67 |
None
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | (a Nationally Adopted International Standard) |
| 14 | 1 Scope 1.1 General 1.2 Types of noise and noise sources 1.3 Test environment 1.4 Measurement uncertainty |
| 15 | 2 Normative references 3 Terms and definitions |
| 20 | 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 |
| 21 | 5.2 Calibration 6 Definition, location, installation and operation of noise source under test 6.1 General 6.2 Auxiliary equipment |
| 22 | 6.3 Noise source location 6.4 Mounting of the noise source |
| 23 | 6.5 Operation of source during test 7 Reference box and measurement surface 7.1 Reference box |
| 24 | 7.2 Measurement surface |
| 27 | 8 Determination of sound power levels and sound energy levels 8.1 Determination of environmental correction 8.2 Microphone positions on the measurement surface |
| 28 | 8.3 Determination of sound power levels |
| 31 | 8.4 Determination of sound energy levels |
| 33 | 9 Measurement uncertainty 9.1 Methodology |
| 34 | 9.2 Determination of .omc 9.3 Determination of .R0 |
| 36 | 9.4 Typical upper bound values of . R0 9.5 Total standard deviation .tot and expanded measurement uncertainty U |
| 37 | 10 Information to be recorded 10.1 General 10.2 Noise source under test 10.3 Test environment 10.4 Instrumentation |
| 38 | 10.5 Acoustical data ii © 2011 Acoustical Society of America—All rights reserved 11 Test report |
| 39 | Annex A (normative) Determination of the environmental correction |
| 40 | Annex B (normative) Microphone arrays on a hemispherical measurement surface B.1 Key microphone positions and additional microphone positions B.2 Microphone positions for sources adjacent to two reflecting planes B.3 Microphone positions for sources adjacent to three reflecting planes |
| 45 | Annex C (normative) Microphone arrays on a parallelepiped measurement surface C.1 Microphone positions for sources mounted on one reflecting plane C.2 Microphone positions for sources adjacent to two or three reflecting planes |
| 53 | Annex D (informative) Guidelines on the development of information on measurement uncertainty D.1 General D.2 Considerations on the total standard deviation . tot D.3 Considerations on . omc |
| 55 | D.4 Considerations on . R0 |
| 61 | D.5 Combined standard uncertainty |
| 62 | D.6 Measurement uncertainty based on reproducibility data |
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