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BS EN 60318-3:2015

BS EN 60318-3:2015

$102.76

Electroacoustics. Simulators of human head and ear – Acoustic coupler for the calibration of supra-aural earphones used in audiometry

Published By Publication Date Number of Pages
BSI 2015 16
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This part of IEC 60318 specifies an acoustic coupler for the measurement of supra-aural audiometric earphones in the frequency range from 125 Hz to 8 000 Hz.

The sound pressure developed by an earphone is not, in general, the same in the coupler as in a person’s ear. However, the acoustic coupler can be used as an objective and reproducible means of measuring the output of supra-aural earphones. It can be used for specifying reference equivalent threshold sound pressure levels (RETSPL) for the calibration of audiometers.

PDF Catalog

PDF Pages PDF Title
6 English
CONTENTS
7 1 Scope
2 Normative references
3 Terms and definitions
4 Construction
4.1 General
8 4.2 Cavity dimensions
9 Figures
Figure 1 – Dimensions of acoustic coupler
10 4.3 Static pressure equalization
4.4 Calibrated pressure type microphone
Tables
Table 1 – Height of the coupler as a function of the acoustic volume of the microphone
11 5 Coupling of earphone to acoustic coupler
6 Calibration
6.1 Reference environmental conditions
Figure 2 – Coupling of earphone to coupler
12 6.2 Method of calibration
7 Maximum permitted uncertainty of measurements
13 Table 2 – Values of maximum permitted uncertainties Umaxfor a level of confidence of approximately 95 %
14 Bibliography

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BS EN 60318-3:2015
$102.76