ASA S12.51 2012
$96.96
ANSI/ASA S12.51-2012 / ISO 3741:2010 (R2017) American National Standard Acoustics – Determination of sound power levels and sound energy levels of noise sources using sound pressure – Precision methods for reverberation test rooms (a nationally adopted international standard)
| Published By | Publication Date | Number of Pages |
| ASA | 2012 | 84 |
None
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 13 | 1 Scope 1.1 General 1.2 Types of noise and noise sources 1.3 Reverberation test room |
| 14 | 1.4 Measurement uncertainty 2 Normative references 3 Terms and definitions |
| 19 | 4 Reference meteorological conditions 5 Reverberation test room 5.1 General 5.2 Volume and shape of test room 5.3 Sound absorption of test room |
| 20 | 5.4 Criteria for background noise |
| 22 | 5.5 Atmospheric temperature, humidity and pressure |
| 23 | 6 Instrumentation and measurement equipment 6.1 General 6.2 Calibration |
| 24 | 7 Definition, location, installation, and operation of noise source under test 7.1 General 7.2 Auxiliary equipment 7.3 Noise source location 7.4 Installation and mounting conditions |
| 25 | 7.5 Operation of source during test |
| 26 | 8 Measurements in the reverberation test room 8.1 General 8.2 Initial location of the noise source under test 8.3 Microphone positions |
| 28 | 8.4 Measurement of sound pressure levels |
| 31 | 8.5 Measurement of single event time-integrated sound pressure levels |
| 32 | 8.6 Measurement of sound pressure levels from the reference sound source for the comparison method |
| 33 | 8.7 Measurement of reverberation time 8.8 Measurement of meteorological conditions 9 Determination of sound power levels and sound energy levels 9.1 Determination of sound power levels |
| 38 | 9.2 Determination of sound energy levels |
| 42 | 9.3 A-weighted sound power level and sound energy level 10 Measurement uncertainty 10.1 Methodology |
| 43 | 10.2 Determination of .omc |
| 44 | 10.3 Determination of .R0 |
| 45 | 10.4 Typical upper bound values of . R0 |
| 46 | 10.5 Total standard deviation . tot and expanded measurement uncertainty, U 11 Information to be recorded 11.1 General 11.2 Noise source under test |
| 47 | 11.3 Test environment 11.4 Instrumentation 11.5 Acoustical data |
| 48 | 12 Test report |
| 49 | Annex A (informative) Guidelines for the design of reverberation test rooms A.1 General A.2 Volume of reverberation test room A.3 Shape of reverberation test room |
| 50 | A.4 Absorption of reverberation test room |
| 51 | Annex B (informative) Guidelines for the design of rotating diffusing vanes |
| 52 | Annex C (normative) Reverberation test room qualification procedure for the measurement of broad-band sound C.1 Introduction C.2 Instrumentation and equipment C.3 Test procedure |
| 53 | C.4 Calculation C.5 Qualification |
| 54 | Annex D (normative) Reverberation test room qualification procedure for the measurement of discrete-frequency components D.1 Introduction |
| 55 | D.2 General D.3 Instrumentation and measurement equipment D.4 Loudspeaker test |
| 56 | D.5 Room test D.6 Computational procedure |
| 57 | D.7 Qualification D.8 Multiple source locations |
| 59 | Annex E (informative) Extension of frequency range to frequencies below 100 Hz E.1 Additional frequency range E.2 Supplement to Table 6 E.3 Supplement to Table 1 (Minimum volume of the reverberation test room as a function of the lowest frequency band of interest E.4 Supplement to Table 4 (Minimum number of microphone positions for the measurement of sound pressure level) and Table 5 (Minimum number of source locations for the measurement of sound pressure level |
| 60 | E.5 Supplement to Table C.1 E.6 Supplement to Tables D.1 and D.2 |
| 62 | Annex F (normative) Calculation of octave band sound power levels and sound energy levels, Aweighted sound power levels and A-weighted sound energy levels from one-third-octave band levels F.1 Sound power levels |
| 63 | F.2 Sound energy levels |
| 64 | F.3 Values of k and Ck for use in calculations |
| 66 | Annex G (informative) Guidelines on the development of information on measurement uncertainty G.1 General G.2 Considerations on the total standard deviation . tot |
| 67 | G.3 Considerations on . omc |
| 68 | G.4 Considerations on . R0 |
| 79 | G.5 Combined standard uncertainty G.6 Measurement uncertainty based on reproducibility data |
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