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BS EN ISO 11904-2:2021

BS EN ISO 11904-2:2021

$142.49

Acoustics. Determination of sound immission from sound sources placed close to the ear – Technique using a manikin

Published By Publication Date Number of Pages
BSI 2021 26
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This document specifies basic framework measurement methods for sound immission from sound sources placed close to the ear. These measurements are carried out with a manikin, equipped with ear simulators including microphones. The measured values are subsequently converted into corresponding free-field or diffuse-field levels. The results are given as free-field related or diffuse-field related equivalent continuous A-weighted sound pressure levels. The technique is denoted the manikin technique.

This document is applicable to exposure to sound from sources close to the ear, for example during equipment tests or at the workplace to sound from earphones or hearing protectors with audio communication facilities.

This document is applicable in the frequency range from 20 Hz to 10 kHz. For frequencies above 10 kHz, ISO 11904-1 can be used.

PDF Catalog

PDF Pages PDF Title
2 National foreword
4 European foreword
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
10 4 Measurement principle
11 5 Instrumentation
5.1 Manikin (head and torso simulator)
5.2 Check of calibration
5.3 Filters
6 Determination of free-field or diffuse-field related equivalent continuous A‑weighted sound pressure level
6.1 Measurement of manikin sound pressure level
12 6.2 Conversion to free-field or diffuse-field related sound pressure level
13 6.3 A-weighting and summation
14 7 Test report
15 Annex A (informative) Examples of sources of measurement uncertainty
22 Annex B (informative) Example of an uncertainty analysis
24 Bibliography

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BS EN ISO 11904-2:2021
$142.49