IEC 60318-6:2007

Electroacoustics - Simulators of human head and ear - Part 6: Mechanical coupler for the measurement on bone vibrators

Describes a mechanical coupler for the measurement of the output force of bone vibrators. The mechanical impedance of the coupler is specified in the frequency range 125 Hz to 8 000 Hz. The coupler is intended for calibration of audiometers using bone vibrators having a plane circular tip area of 175 mm² ± 25 mm² and for determining the performance of bone conduction hearing aids. The vibratory force developed by a bone vibrator is not, in general, the same on the coupler as on a person's mastoid. However, the IEC recommends its use as a means for the calibration of specified vibrators used in audiometry and for the exchange of specifications and of data on bone conduction hearing aids. This standard cancels and replaces IEC 60373 published in 1990. This first edition constitutes a technical revision.

Electroacoustique - Simulateurs de tête et d'oreille humaines - Partie 6: Coupleur mécanique destiné aux mesures des ossivibrateurs

Décrit un coupleur mécanique destiné à la mesure de la force de sortie des ossivibrateurs. L'impédance mécanique du coupleur est spécifiée dans la gamme de fréquences comprise entre 125 Hz et 8 000 Hz. Le coupleur est destiné à l'étalonnage des audiomètres utilisant les ossivibrateurs dont l'extrémité présente une surface plane et circulaire de 175 mm2 ± 25 mm2 et à la détermination de la performance des appareils de correction auditive à conduction osseuse. La force vibratoire développée par un ossivibrateur n'est pas, en général, la même sur le coupleur que sur la mastoïde d'une personne. Cependant, la CEI recommande son utilisation comme moyen d'étalonnage des vibrateurs spécifiés, utilisés en audiométrie et pour l'échange des spécifications et des données sur les appareils de correction auditive à conduction osseuse. La présente norme annule et remplace la CEI 60373 parue en 1990. Cette première édition constitue une révision technique.

General Information

• Status: Published
• Publication Date: 26-Nov-2007
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 17.140.50 - Electroacoustics
• Technical Committee: TC 29 - Electroacoustics
• Drafting Committee: WG 21 - TC 29/WG 21
• Current Stage: PPUB - Publication issued
• Start Date: 31-Mar-2008
• Completion Date: 27-Nov-2007

Standards Content (Sample)

IEC 60318-6
Edition 1.0 2007-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electroacoustics – Simulators of human head and ear –
Part 6: Mechanical coupler for the measurement of bone vibrators

Electroacoustique – Simulateurs de tête et d'oreille humaines –
Partie 6: Coupleur mécanique destiné à la mesure des ossivibrateurs

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IEC 60318-6
Edition 1.0 2007-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electroacoustics – Simulators of human head and ear –
Part 6: Mechanical coupler for the measurement of bone vibrators

Electroacoustique – Simulateurs de tête et d'oreille humaines –
Partie 6: Coupleur mécanique destiné à la mesure des ossivibrateurs

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
P
CODE PRIX
ICS 17.140.50 ISBN 2-8318-9470-0

– 2 – 60318-6 © IEC:2007
CONTENTS
FOREWORD.3

1 Scope.5
2 Normative reference .5
3 Terms and definitions .5
4 Construction .6
4.1 General .6
4.2 Mechanical impedance level.7
4.3 Phase angle of mechanical impedance.8
4.4 External geometry .8
5 Calibration.8
5.1 Reference environmental conditions.8
5.2 Calibration procedure .8
5.3 Force sensitivity level .8
5.4 Mechanical impedance level.9
5.5 Temperature dependence.9
6 Marking and instruction manual .9
6.1 Marking of the mechanical coupler .9
6.2 Instruction manual.9
7 Coupling of bone vibrator to the mechanical coupler.9
8 Maximum permitted expanded uncertainty of measurements .10

Annex A (informative) Example of a specific construction of a mechanical coupler.11
Annex B (informative) Guidance on the testing and calibration of mechanical couplers .14

Bibliography.15

Figure A.1 – Dimensions of mechanical impedance element base.12
Figure A.2 – Dimensions of tungsten loading insert.12
Figure A.3 – Assembly of the mechanical coupler .13

Table 1 – Mechanical impedance level.7
Table 2 – Values of U for basic measurements .10
max
60318-6 © IEC:2007 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROACOUSTICS –
SIMULATORS OF HUMAN HEAD AND EAR –

Part 6: Mechanical coupler for the measurement of bone vibrators

FOREWORD
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indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60318-6 has been prepared by IEC technical committee 29:
Electroacoustics.
This standard cancels and replaces IEC 60373 published in 1990. This first edition constitutes
a technical revision.
The text of this standard is based on the following documents:
CDV Report on voting
29/615/CDV 29/628A/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
A list of all parts of the IEC 60318 series under the general title: Electroacoustics – Simulators
of human head and ear, can be found on the IEC website.

– 4 – 60318-6 © IEC:2007
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
60318-6 © IEC:2007 – 5 –
ELECTROACOUSTICS –
SIMULATORS OF HUMAN HEAD AND EAR –

Part 6: Mechanical coupler for the measurement of bone vibrators

1 Scope
This part of IEC 60318 describes a mechanical coupler for the measurement of the output
force of bone vibrators. The mechanical impedance of the coupler is specified in the
frequency range 125 Hz to 8 000 Hz. The coupler is intended for calibration of audiometers
using bone vibrators having a plane circular tip area of 175 mm² ± 25 mm² and for determining
the performance of bone conduction hearing aids.
The vibratory force developed by a bone vibrator is not, in general, the same on the coupler
as on a person’s mastoid. However, the IEC recommends its use as a means for the
calibration of specified vibrators used in audiometry and for the exchange of specifications
and of data on bone conduction hearing aids.
NOTE Some bone vibrators of hearing aids and some non-standardised bone vibrators still used in audiometry
have a curved surface. Users should be aware that those vibrators in general will not be loaded on the mechanical
coupler with the same mechanical impedance as the one specified in Table 1 of this standard.
2 Normative reference
The following referenced document is indispensable for the application of this document. For
dated references, only the edition cited applies. For undated references, the latest edition of
the referenced document (including any amendments) applies.
BIPM, IEC, ISO, IFCC, IUPAC, IUPAP
...