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IEC 60118-9
Edition 2.0 2019-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electroacoustics – Hearing aids –
Part 9: Methods of measurement of the performance characteristics of bone
conduction hearing aids
Électroacoustique – Appareils de correction auditive –
Partie 9: Méthodes de mesure des caractéristiques fonctionnelles des appareils
de correction auditive à conduction osseuse
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IEC 60118-9
Edition 2.0 2019-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electroacoustics – Hearing aids –
Part 9: Methods of measurement of the performance characteristics of bone
conduction hearing aids
Électroacoustique – Appareils de correction auditive –
Partie 9: Méthodes de mesure des caractéristiques fonctionnelles des appareils
de correction auditive à conduction osseuse
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.140.50 ISBN 978-2-8322-7332-6
– 2 – IEC 60118-9:2019 © IEC 2019
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Measurement method . 11
4.1 General . 11
4.2 Mechanical coupler . 11
4.3 Skull simulator . 11
4.4 Measurement frequency range . 11
4.5 Reporting of data . 12
5 Measurement enclosure and measurement equipment. 12
5.1 General . 12
5.2 Unwanted stimuli in the test enclosure . 12
5.3 Sound source . 12
5.4 Measurement system for the measurement of the vibratory force level
produced by a bone conduction hearing aid . 12
5.5 Direct-current measuring system . 13
5.6 Magnetic field source for ETLS and MMSL measurements . 13
6 Measurement conditions . 14
6.1 General . 14
6.2 Applying the bone vibrator to the mechanical coupler or skull simulator . 14
6.2.1 Transcutaneously coupled devices . 14
6.2.2 Bone coupled devices . 14
6.3 Control of the sound field . 15
6.3.6 Battery or supply voltage . 17
6.3.7 Settings of controls . 18
6.4 Ambient conditions. 18
6.4.1 Measurement space . 18
6.4.2 Bone vibrator, mechanical coupler and skull simulator . 18
7 Measurement procedures . 19
7.1 Frequency response curves . 19
7.2 OVFL90 frequency response curve . 19
7.3 Full-on acousto-mechanical sensitivity level frequency response . 20
7.4 Basic vibratory force level frequency response . 21
7.4.1 Measurement procedure . 21
7.4.2 Frequency range . 21
7.5 Total harmonic distortion . 21
7.6 Equivalent input noise . 22
7.7 Battery current . 22
7.8 Measurements for hearing aids having an induction pick-up coil . 22
7.8.1 General . 22
7.8.2 Equivalent test loop sensitivity (ETLS) . 23
7.8.3 Maximum HFA magneto-mechanical sensitivity level (HFA- MMSL) of
induction pick-up coil . 23
8 Maximum permitted expanded uncertainty of measurements . 23
Bibliography . 26
Figure 1 – Example of a bone coupled device (hearing aid with integral bone vibrator)
mounted on a skull simulator . 15
Figure 2 – Example of a transcutaneously coupled device (spectacle hearing aid with
an integral bone vibrator mounted in the spectacle arm) under measurement . 16
Figure 3 – Example of a transcutaneously coupled device (hearing aid with external
bone vibrator) mounted on the mechanical coupler . 17
Figure 4 – Example of OVFL90 curve and basic force level frequency response curve . 20
Figure 5 – Relationship between tolerance limits, corresponding acceptance intervals
and the maximum permitted uncertainty of measurement, U . 24
MAX
Table 1 – Resistors and open circuit voltages for zinc-air battery simulators . 18
Table 2 – Distortion test frequencies and input sound pressure levels . 22
Table 3 – Example uncertainty budget . 25
– 4 – IEC 60118-9:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROACOUSTICS –
HEARING AIDS –
Part 9: Methods of measurement of the performance
characteristics of bone conduction hearing aids
FOREWORD
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