This part of IEC 60318 describes a mechanical coupler for the measurement of the output
force of bone vibrators. The mechanical impedance of the coupler is specified in the
frequency range 125 Hz to 8 000 Hz. The coupler is intended for calibration of audiometers
using bone vibrators having a plane circular tip area of 175 mm² ± 25 mm² and for determining
the performance of bone conduction hearing aids.
The vibratory force developed by a bone vibrator is not, in general, the same on the coupler
as on a person’s mastoid. However, the IEC recommends its use as a means for the
calibration of specified vibrators used in audiometry and for the exchange of specifications
and of data on bone conduction hearing aids.
NOTE Some bone vibrators of hearing aids and some non-standardised bone vibrators still used in audiometry
have a curved surface. Users should be aware that those vibrators in general will not be loaded on the mechanical
coupler with the same mechanical impedance as the one specified in Table 1 of this standard.
BS EN 60318-6:2008 Referenced Document
ISO ISO IEC 27001-2013 cor2-2015 technical errata*, 2024-04-19 Update
BS EN 60318-6:2008 history
2008BS EN 60318-6:2008 Electroacoustics - Simulators of human head and ear -Part 6: Mechanical coupler for the measurement of bone vibrators
1991BS 4009:1991 Specification for artificial mastoids for the calibration of bone vibrators used in hearing aids and audiometers