EN 60118-8:2005

SLOVENSKI SIST EN 60118-8:2006

STANDARD
marec 2006
Elektroakustika – Slušni pripomočki – 8. del: Metode za merjenje
zmogljivostnih karakteristik slušnih pripomočkov v pogojih simuliranega
delovanja na kraju samem (IEC 60118-8:2005)
Electroacoustics - Hearing aids - Part 8: Methods of measurement of performance
characteristics of hearing aids under simulated in situ working conditions (IEC
60118-8:2005)
ICS 11.180.15 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD EN 60118-8
NORME EUROPÉENNE
EUROPÄISCHE NORM December 2005

ICS 17.140.50
English version
Electroacoustics –
Hearing aids
Part 8: Methods of measurement of performance characteristics
of hearing aids under simulated in situ working conditions
(IEC 60118-8:2005)
Electroacoustique –  Akustik –
Appareils de correction auditive Hörgeräte
Partie 8: Méthodes de mesure Teil 8: Verfahren zur Messung der
des caractéristiques fonctionnelles Übertragungseigenschaften von
des appareils de correction auditive Hörgeräten unter simulierten
In-Situ-Bedingungen
dans des conditions simulées
de fonctionnement in situ (IEC 60118-8:2005)
(CEI 60118-8:2005)
This European Standard was approved by CENELEC on 2005-12-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60118-8:2005 E
Foreword
The text of document 29/584/FDIS, future edition 2 of IEC 60118-8, prepared by IEC TC 29,
Electroacoustics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC
as EN 60118-8 on 2005-12-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2006-09-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2008-12-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60118-8:2005 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60068 NOTE Harmonized in the EN 60068 series (not modified).
IEC 60118-7 NOTE Harmonized as EN 60118-7:2005 (not modified).
__________
- 3 - EN 60118-8:2005
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following referenced documents are 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.
NOTE Where an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
IEC 60118-0 1983 Hearing aids EN 60118-0 1993
Part 0: Measurement of electroacoustical
characteristics
1)
IEC 60263 - Scales and sizes for plotting frequency - -
characteristics and polar diagrams

1) 2)
IEC 60711 - Occluded-ear simulator for the HD 443 S1 1983
measurement of earphones coupled to
the ear by ear inserts
1)
IEC 60959 - Provisional head and torso simulator for - -
acoustic measurements on air conduction
hearing aids
1)
Undated reference.
2)
Valid edition at date of issue.

NORME CEI
INTERNATIONALE
IEC
60118-8
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
2005-10
Electroacoustique –
Appareils de correction auditive –
Partie 8:
Méthodes de mesure des caractéristiques
fonctionnelles des appareils de correction
auditive dans des conditions simulées de
fonctionnement in situ
Electroacoustics –
Hearing aids –
Part 8:
Methods of measurement of performance
characteristics of hearing aids under
simulated in situ working conditions

 IEC 2005 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
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Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
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МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue

60118-8  IEC:2005 – 3 –
CONTENTS
FOREWORD.7
INTRODUCTION.11

1 Scope.13
2 Normative references .13
3 Terms and definitions .13
4 Limitations.21
5 Test equipment.23
5.1 Acoustical requirements for the test space .23
5.2 Sound source .23
5.3 Manikin .25
5.4 Ear simulator.25
5.5 Ear insert simulator .25
5.6 Equipment for the measurement of occluded-ear simulator sound pressure
level .25
5.7 Equipment for automatic sweep frequency recording .27
5.8 Equipment for calibration of free field sound pressure level .27
6 Test conditions .27
6.1 Choice of test point .27
6.2 Ambient conditions .27
6.3 Manikin .27
6.4 Location of the hearing aid .29
6.5 Normal operating conditions for the hearing aid.29
7 Measurements.31
7.1 General .31
7.2 Adjustment of the reference input sound pressure level.31
7.3 Manikin frequency response (MFR) .31
7.4 Full-on simulated insertion gain measured by the constant reference input
SPL method .33
7.5 Full-on simulated insertion gain measured by the constant ear simulator SPL
method.33
7.6 Directional characteristics .35
7.7 Simulated in situ OSPL90 measurements .39

7.8 Simplified method to measure simulated in situ and insertion gain response .41
8 Frequency response recording charts .41
9 Maximum permitted expanded uncertainty of measurements .41

Annex A (normative) Free-field to hearing-aid-microphone transformation .45
Annex B (normative) Manikin unoccluded-ear gain (open ear response) .53
Annex C (informative) General requirements for a manikin .57

Bibliography.63

60118-8  IEC:2005 – 5 –
Figure A.1 – Microphone location and corresponding free-field to hearing-aid-
microphone transformation for behind-the-ear instruments.47
Figure A.2 – Microphone location and corresponding free-field to hearing-aid-
microphone transformation for full-concha instruments .47
Figure A.3 – Microphone location and corresponding free-field to hearing-aid-
microphone transformation for canal size instruments.49
Figure A.4 – Microphone location and corresponding free-field to hearing-aid-
microphone transformation for completely-in-the-ear canal instruments .49
Figure B.1 – Manikin unoccluded-ear gain frequency response.53
Figure C.1 – Manikin geometrical references .59
Figure C.2 – Co-ordinates for angles of azimuth and elevation.61

Table 1 – Values of U for basic measurements .43
max
Table A.1 – Numerical data for the various free-field to hearing-aid-microphone
transformation responses.51
Table B.1 – Numerical data of manikin unoccluded-ear gain frequency response.55

60118-8  IEC:2005 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROACOUSTICS –
HEARING AIDS –
Part 8: Methods of measurement of performance characteristics
of hearing aids under simulated in situ working conditions

FOREWORD
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international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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transparentl
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