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BS EN 17479:2021

BS EN 17479:2021

$189.07

Hearing protectors. Guidance on selection of individual fit testing methods

Published By Publication Date Number of Pages
BSI 2021 46
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This document gives guidelines for the appropriate selection of fit testing methods and measurement, and provides practical guidelines on fit testing methods, their uses and limitations. This document does not specify the technical requirements for manufacturing fit testing equipment.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 1 Scope
2 Normative references
3 Terms and definitions
9 4 Individual fit testing methods
4.1 General
10 4.2 Test methods
11 4.3 Reference method for sound attenuation measurements of hearing protectors
4.4 Description of different fit testing methods
4.4.1 Sound-level measurements with microphone in real ear (MIRE) (method 1)
4.4.1.1 General
12 4.4.1.2 Sound field generated by a headset (method 1a)
4.4.1.3 Sound field generated by a loudspeaker (free field) (method 1b)
13 4.4.2 Audiometric method (determination of the threshold of hearing with and without hearing protector) (method 2)
4.4.2.1 General
4.4.2.2 Sound field generated by a headset (method 2a)
4.4.2.3 Sound field generated by a loudspeaker (method 2b)
14 4.4.3 Audiometric-based method (determination of the threshold of hearing with and without hearing protector) (method 3)
4.4.3.1 General
4.4.3.2 Sound field generated by a headset (method 3a)
4.4.3.3 Sound field generated by a loudspeaker (method 3b)
15 4.4.4 Loudness balancing method (method 4)
4.4.5 Acoustic leakage test (method 5)
16 4.4.6 Air leakage test (method 6)
17 4.4.7 Summary of different test methods
18 5 Test procedure of the fit testing methods
5.1 General
5.2 Sound-level measurements with microphone in real ear (MIRE) (method 1)
5.2.1 Sound field generated by a headset (method 1a)
19 5.2.2 Sound field generated by a loudspeaker (method 1b)
20 5.3 Audiometric method (method 2)
5.3.1 Sound field generated by a headset (method 2a)
22 5.3.2 Sound field generated by a loudspeaker (method 2b)
23 5.4 Audiometric-based method (method 3)
5.4.1 Sound field generated by a headset (method 3a)
24 5.4.2 Sound field generated by a loudspeaker (method 3b)
5.5 Loudness balancing (method 4)
25 5.6 Acoustic leakage test (method 5)
26 5.7 Air leakage test (method 6)
27 6 Evaluation criteria
6.1 Application field of the different methods
6.1.1 General
28 6.1.2 Select an appropriate hearing protector
29 6.1.3 End user training
6.1.4 Training for trainers and supervisors
6.1.5 Health surveillance or hearing conservation
6.1.6 Verify adequacy of attenuation to noise level at workplace
6.1.7 Fit of custom moulded earplugs
6.1.8 Awareness increase
6.2 Selection according to ease of use
30 6.3 Individual care for workers with hearing impairment
31 6.4 Applicability of methods to the different types of hearing protectors
32 7 Frequency of fit testing
8 Uncertainty
8.1 General factors for the uncertainty of fit testing
33 8.2 Particular factors regarding the uncertainty for the different fit testing methods
8.2.1 MIRE techniques
8.2.2 Audiometric methods
34 8.2.3 Audiometric-based methods
8.2.4 Loudness balancing
8.2.5 Acoustic leakage test
35 8.2.6 Air leakage test
8.3 Quantitative approach
8.3.1 MIRE techniques
8.3.2 Audiometric systems
36 8.3.3 Audiometric-based systems
8.3.4 Loudness balancing
8.3.5 Acoustic leakage test
8.3.6 Air leakage test
9 Test report
38 Annex A (informative)Comparison to target values
A.1 General
A.2 Sound attenuation values from type examination
A.2.1 General
A.2.2 Octave band values
39 A.2.3 HML and SNR values
40 A.3 Residual levels at the ear
42 Annex B (informative)Example of a protocol for the determination of measurement uncertainty

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BS EN 17479:2021
$189.07