Table of Contents

Foreword<br>Introduction<br>1 Scope<br>2 Normative references<br>3 Terms and definitions<br>4 Reference equivalent threshold vibratory <br>&nbsp;&nbsp;force levels (RETVFL)<br>5 Test conditions and requirements<br>Annex A (informative) - Note on the derivation of <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;RETVFL values<br>Annex B (informative) - Guidance on the application <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;of the reference zero to the calibration of bone-conduction <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;audiometers<br>Annex C (informative) - Differences in reference equivalent <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;threshold vibratory force levels between forehead and <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;mastoid location of vibrator<br>Annex D (informative) - Bone-conduction threshold of hearing <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;for frequencies below 250 Hz<br>Bibliography

Abstract

Defines the following data applicable to the calibration of bone vibrators for pure-tone bone-conduction audiometry: a) reference equivalent threshold vibratory force levels (RETVFL), corresponding to the threshold of hearing of young otologically normal persons by bone-conduction audiometry; b) essential characteristics of the bone vibrator and the method of coupling to the test subject, and to the mechanical coupler; and c) essential characteristics of the masking noise and the baseline masking noise level applied to the ear not under test.

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Published
Document Type	Standard
Status	Current
Publisher	British Standards Institution
Pages
ISBN
Committee	EH/1/1
Supersedes	BS 6950(1988) : 1988 14/30279048 DC : DRAFT OCT 2014 BS ISO 389-3 : 1994 AMD 10483