EN ISO 389-3:2016

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

ISO 389-1:2016 specifies 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; c) essential characteristics of the masking noise and the baseline masking noise level applied to the ear not under test.