DS/EN ISO 389-3:2016

Acoustics - Reference zero for the calibration of audiometric equipment - Part 3: Reference equivalent threshold vibratory force levels for pure tones and bone vibrators (ISO 389-3:2016)

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This part of ISO 389 specifies the following data applicable to the calibration of bone vibrators for puretone
bone-conduction audiometry. Guidance on the practical application of this part of ISO 389 in the
calibration of audiometers is given in Annex B.
a) Reference equivalent threshold vibratory force levels (RETVFLs), corresponding to the threshold
of hearing of young otologically normal persons by bone-conduction audiometry. RETVFL is the
vibratory force level transmitted to a mechanical coupler of specified characteristics (see 5.4) by a
vibrator when applied to the mechanical coupler under stated conditions of test and when energized
at the voltage level corresponding to the normal threshold of hearing for location on the mastoid
NOTE 1 – Values for the differences in reference equivalent threshold vibratory force levels between
location on the forehead and mastoid are included for information in Annex C.
b) Essential characteristics of the bone vibrator and the method of coupling to the test subject, and to
the mechanical coupler.
c) Essential characteristics and the baseline masking noise level applied to the ear not under test.
NOTE 2 – Recommended procedures for carrying out bone-conduction audiometry are specified in ISO 8253‑1.

Number of pages: 26

Published: 2016-03-16

Date of approval: 2016-02-29

International relationships : EN ISO 389-3:2016 IDT ISO 389-3:2016 IDT

ICS: 13.140 - Noise with respect to human beings

Item number: M288841



  • CEN/TC 211
  • ISO/TC 43
  • ISO/TC 43/WG 1

Danish committee