EN 60118-4:2006
(Main)Electroacoustics - Hearing aids - Part 4: Induction loop systems for hearing aid purposes - Magnetic field strength
Electroacoustics - Hearing aids - Part 4: Induction loop systems for hearing aid purposes - Magnetic field strength
Applies to audio-frequency induction loop systems producing an alternating magnetic field at audio frequencies and intended to provide an input signal for hearing aids operating with an induction pick-up coil. The standard specifies requirements for the field strength in audio-frequency induction loops for hearing aid purposes, which will give adequate signal-to-noise ratio without overloading the hearing aid. The standard also specifies the minimum frequency response requirements for acceptable intelligibility. Methods for measuring the magnetic field strength are specified, and information is given on appropriate measuring equipment (see Annex B), information that should be provided to the operator and users of the system (see Annex C), and other important considerations.
Akustik - Hörgeräte - Teil 4: Induktionsschleifen für Hörgeräte - Magnetische Feldstärke
Electroacoustique - Appareils de correction auditive - Partie 4: Systèmes de boucles d'induction utilisées à des fins de correction auditive - Intensité du champ magnétique
S'applique aux systèmes de boucles d'induction audiofréquences qui produisent un champ magnétique alternatif à fréquence acoustique et destinés à produire un signal d'entrée aux appareils de correction auditive fonctionnant avec une bobine d'induction captrice. Cette norme spécifie des exigences concernant l'intensité du champ dans les boucles d'induction utilisées à des fins de correction auditive, qui correspond à un rapport signal sur bruit convenable sans surcharge de l'appareil de correction auditive. Elle spécifie également des exigences concernant la réponse en fréquence minimale pour une intelligibilité acceptable. Les méthodes de mesure de l'intensité du champ magnétique et des renseignements sur l'équipement de mesure approprié (voir Annexe B), ainsi que les renseignements qu'il y a lieu de fournir aux opérateurs et aux utilisateurs du système (voir Annexe C) sont donnés, avec d'autres considérations importantes.
Elektroakustika - Slušni pripomočki - 4. del: Sistemi z indukcijsko zanko za slušne pripomočke - Jakost magnetnega polja (IEC 60118-4:2006)
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Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2008
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SIST EN 60118-4:2002
SIST EN 60118-4:2002/A1:2002
(OHNWURDNXVWLND6OXãQLSULSRPRþNLGHO 6LVWHPL]LQGXNFLMVNR]DQNR]DVOXãQH
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Electroacoustics - Hearing aids - Part 4: Induction loop systems for hearing aid purposes
- Magnetic field strength (IEC 60118-4:2006)
Akustik - Hörgeräte - Teil 4: Induktionsschleifen für Hörgeräte - Magnetische Feldstärke
(IEC 60118-4:2006)
Electroacoustique - Appareils de correction auditive - Partie 4: Systemes de boucles
d'induction utilisées a des fins de correction auditive - Intensité du champ magnétique
(IEC 60118-4:2006)
Ta slovenski standard je istoveten z: EN 60118-4:2006
ICS:
11.180.15 3ULSRPRþNL]DJOXKHRVHEHLQ Aids for deaf and hearing
RVHEH]RNYDURVOXKD impaired people
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 60118-4
NORME EUROPÉENNE
December 2006
EUROPÄISCHE NORM
ICS 17.140.50 Supersedes EN 60118-4:1998 + A1:1998
English version
Electroacoustics -
Hearing aids
Part 4: Induction loop systems for hearing aid purposes -
Magnetic field strength
(IEC 60118-4:2006)
Electroacoustique - Akustik -
Appareils de correction auditive Hörgeräte
Partie 4: Systèmes de boucles d'induction Teil 4: Induktionsschleifen
utilisées à des fins de correction auditive - für Hörgeräte -
Intensité du champ magnétique Magnetische Feldstärke
(CEI 60118-4:2006) (IEC 60118-4:2006)
This European Standard was approved by CENELEC on 2006-11-01. 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, the Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the 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
© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60118-4:2006 E
Foreword
The text of document 29/604/FDIS, future edition 2 of IEC 60118-4, prepared by IEC TC 29,
Electroacoustics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
EN 60118-4 on 2006-11-01.
This European Standard supersedes EN 60118-4:1998 + A1:1998.
The purpose of this revision is to provide more information about practical considerations and methods of
measurement. In addition, the requirements for magnetic field strength have been clarified and modified
in the light of practical experience since EN 60118-4:1998 was published. Requirements for the provision
to the end-user of information about the system have been introduced, intended to help to keep systems
working once they have been correctly set up.
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) 2007-08-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2009-11-01
__________
Endorsement notice
The text of the International Standard IEC 60118-4:2006 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 60118-1 NOTE Harmonized as EN 60118:1995 + A1:1998 (not modified).
A1
IEC 60268-1 NOTE Harmonized as HD 483.1.S1:1998 (not modified).
IEC 60268-3 NOTE Harmonized as EN 60268-3:2003 (not modified).
IEC 60268-10 NOTE Harmonized as HD 483.10.S1:1993 (not modified).
IEC 61260 NOTE Harmonized as EN 61260:1995 (not modified).
IEC 61672-1 NOTE Harmonized as EN 61672-1:2003 (not modified).
IEC 61938 NOTE Harmonized as EN 61938:1997 (not modified).
__________
NORME CEI
INTERNATIONALE
IEC
60118-4
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
2006-10
Électroacoustique –
Appareils de correction auditive –
Partie 4:
Systèmes de boucles d’induction
utilisées à des fins de correction auditive –
Intensité du champ magnétique
Electroacoustics –
Hearing aids –
Part 4:
Induction loop systems
for hearing aid purposes –
Magnetic field strength
© IEC 2006 Droits de reproduction réservés ⎯ Copyright - all rights reserved
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Pour prix, voir catalogue en vigueur
For price, see current catalogue
60118-4 © IEC:2006 – 3 –
CONTENTS
FOREWORD.7
INTRODUCTION.11
1 Scope.15
2 Normative references .15
3 Terms and definitions .15
4 Suitability of the site for the installation of an audio-frequency induction-loop
system.17
4.1 General .17
4.2 Measurement of magnetic background noise level.17
5 Test signals.19
5.1 General .19
5.2 Speech signals.21
5.3 Pink noise signal .21
5.4 Sinusoidal signal .21
6 Characteristics to be specified, methods of measurement and requirements.23
6.1 General .23
6.2 Amplitude characteristic of the system (or amplifier).23
6.3 Magnetic field strength .25
6.4 Setting up (commissioning) the system.29
6.5 Magnetic noise level due to the system .31
6.6 Frequency response of the magnetic field .31
6.7 Useful magnetic field volume.33
Annex A (informative) Small area systems .37
Annex B (informative) Measuring equipment .39
Annex C (informative) Provision of information .45
Annex D (informative) Measuring speech signals .51
Annex E (informative) Basic theory and practice of audio-frequency induction-loop
systems .53
Annex F (informative) Calibration of field-strength meters.77
Bibliography.81
Figure C.1 – Graphical symbol No.10: Inductive coupling .47
Figure E.1 – Perspective view of a loop, showing the magnetic field vector paths .55
Figure E.2 – Variation of the vertical field strength with position, due to a current in a
rectangular loop, with perpendicular distance from the loop plane, as parameter .57
Figure E.3a – Geometry of the loop and positions of measurement of the field patterns
shown in Figure E.3b .59
Figure E.3b – Patterns of the vertical and horizontal components of the magnetic field
due to current in a horizontal rectangular loop, at points in a plane above or below the
loop plane.59
60118-4 © IEC:2006 – 5 –
Figure E.4 – Field patterns of the vertical component of the magnetic field of a
horizontal loop .61
Figure E.5 – Field patterns of the vertical component of the magnetic field of a
vertical loop .63
Figure E.6 – Perspective view of the variation of the vertical field strength level
at an optimum height above a horizontal rectangular loop.65
Figure E.7a – Directional response of the magnetic pick-up coil of a hearing aid;
linear amplitude scale .65
Figure E.7b – Directional response of the magnetic pick-up coil of a hearing aid;
decibel amplitude scale.67
Figure F.1 – Triple Helmholtz coil for calibration of meters.77
60118-4 © IEC:2006 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROACOUSTICS – HEARING AIDS –
Part 4: Induction loop systems for hearing aid purposes –
Magnetic field strength
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