AS/NZS ISO 389.3:2019
Acoustics - Reference zero for the calibration of audiometric equipment - Part 3: Reference equivalent threshold vibratory force levels for pure tones and bone vibrators
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; and (c) essential characteristics of the masking noise and the baseline masking noise level applied to the ear not under test. Guidance on the practical application of this Standard in the calibration of audiometers is given in Annex B. Identical with and reproduced from ISO 389-3:2016.
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AS/NZS ISO 389.3:2019 Reference zero for the calibration of audiometric equipment Reference equivalent threshold vibratory force levels for pure tones and bone vibrators
Preface
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Reference equivalent threshold vibratory force levels (RETVFL)
5 Test conditions and requirements
5.1 General
5.2 Bone vibrator
5.3 Fitting of the bone vibrator
5.4 Mechanical coupler
5.5 Test signal
5.6 Masking noise
5.7 Masking transducer
5.8 Fitting of masking transducer
5.9 Baseline masking level
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
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References
Acoustics - Reference zero for the calibration of audiometric equipment - Part 1: Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones
Related Information
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AS/NZS 1591.1:1995
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AS/NZS ISO 389.1:2019
Acoustics - Reference zero for the calibration of audiometric equipment - Part 1: Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones
AS/NZS ISO 389.3:2019 Reference zero for the calibration of audiometric equipment Reference equivalent threshold vibratory force levels for pure tones and bone vibrators
Preface
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Reference equivalent threshold vibratory force levels (RETVFL)
5 Test conditions and requirements
5.1 General
5.2 Bone vibrator
5.3 Fitting of the bone vibrator
5.4 Mechanical coupler
5.5 Test signal
5.6 Masking noise
5.7 Masking transducer
5.8 Fitting of masking transducer
5.9 Baseline masking level
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
AS/NZS ISO 389.3:2019
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.