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BSI 22/30427270 DC 2022

BSI 22/30427270 DC 2022

$13.70

BS EN ISO 10534-2. Acoustics. Determination of properties in impedance tubes – Part 2. 2-microphone technique for normal sound absorption coefficient and normal surface impedance

Published By Publication Date Number of Pages
BSI 2022 37
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PDF Catalog

PDF Pages PDF Title
1 30427270-NC.pdf
3 ISO_DIS 10534-2 ed.2 – id.81294 Enquiry PDF (en).pdf
6 Foreword
7 1 Scope
2 Terms, Definitions and symbols
10 3 Principle
11 4 Test equipment
4.1 Construction of the impedance tube
12 4.2 Working frequency range
4.3 Length of the impedance tube
13 4.4 Microphones
4.5 Positions of the microphones
14 4.6 Acoustic centre of the microphone
4.7 Test sample holder
4.8 Signal processing equipment
15 4.9 Loudspeaker
4.10 Signal generator
4.11 Thermometer, barometer and hygrometer
5 Preliminary test and measurements
16 6 Test specimen mounting
17 7 Test procedure
7.1 Specification of the reference plane
7.2 Determination of the sound velocity, wavelength and characteristic impedance
18 7.3 Selection of the signal amplitude
7.4 Selection of the number of averages
7.5 Correction for microphone mismatch
19 7.5.1 Measurement repeated with the microphones interchanged
20 7.5.2 Predetermined calibration factor
21 7.6 Determination of the transfer function between the two locations
22 7.7 Determination of the reflection coefficient
7.8 Determination of the sound absorption coefficient
7.9 Determination of the specific acoustic impedance ratio
23 7.10 Determination of the specific acoustic admittance ratio
8 Precision
9 Test report
27 Annex€A (normative) Preliminary measurements
29 Annex€B (normative) Procedure for the one-microphone technique
30 Annex€C (informative) Theoretical background
32 Annex€D (informative) Error sources
34 Annex€E (informative) Estimation of diffuse sound absorption coefficient ast of locally reacting absorbers from the results of this part of ISO 10534
35 Annex€F (informative) Estimation of intrinsic properties
37 Bibliography

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BSI 22/30427270 DC 2022
$13.70