BS-EN-60118-4-2006.pdf
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1、BRITISH STANDARD BS EN 60118-4:2006 Electroacoustics Hearing aids Part 4: Induction loop systems for hearing aid purposes Magnetic field strength The European Standard EN 60118-4:2006 has the status of a British Standard ICS 17.140.50 ? Licensed Copy: London South Bank University, London South Bank
2、University, Tue Jan 30 01:27:58 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS EN 60118-4:2006 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2007 BSI 2007 ISBN 978 0 580 50047 3 National foreword This British Standard was publishe
3、d by BSI. It is the UK implementation of EN 60118-4:2006. It is identical with IEC 60118-4:2006. It supersedes BS EN 60118-4:1998 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee EPL/29, Electroacoustics. A list of organizations represented on EPL/29 c
4、an be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publicatio
5、n Amd. No. DateComments Licensed Copy: London South Bank University, London South Bank University, Tue Jan 30 01:27:58 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD EN 60118-4 NORME EUROPENNE EUROPISCHE NORM December 2006 CENELEC European Committee for Electrotechnical Standardization
6、 Comit Europen de Normalisation Electrotechnique Europisches Komitee fr 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 ICS 1
7、7.140.50 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 - Appareils de correction auditive Partie 4: Systmes de boucles dinduction utilises des
8、 fins de correction auditive - Intensit du champ magntique (CEI 60118-4:2006) Akustik - Hrgerte Teil 4: Induktionsschleifen fr Hrgerte - Magnetische Feldstrke (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 Int
9、ernal 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
10、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. CEN
11、ELEC 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, Sloveni
12、a, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: London South Bank University, London South Bank University, Tue Jan 30 01:27:58 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Foreword The text of document 29/604/FDIS, future edition 2 of IEC 60118-4, prepared by IEC TC 29, Electroac
13、oustics, 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 addi
14、tion, 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
15、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
16、 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. _ EN 60118-4:2006 2 Licensed Copy: London South Bank University, London South Bank University, Tue Jan 30 01:27:58 GMT+00:
17、00 2007, Uncontrolled Copy, (c) BSI 3 EN 60118-4:2006 CONTENTS INTRODUCTION.5 1 Scope 7 2 Normative references .7 3 Terms and definitions .7 4 Suitability of the site for the installation of an audio-frequency induction-loop system .8 4.1 General.8 4.2 Measurement of magnetic background noise level8
18、 5 Test signals9 5.1 General.9 5.2 Speech signals10 5.3 Pink noise signal .10 5.4 Sinusoidal signal .10 6 Characteristics to be specified, methods of measurement and requirements 11 6.1 General.11 6.2 Amplitude characteristic of the system (or amplifier).11 6.3 Magnetic field strength.12 6.4 Setting
19、 up (commissioning) the system 14 6.5 Magnetic noise level due to the system 15 6.6 Frequency response of the magnetic field 15 6.7 Useful magnetic field volume .16 Annex A (informative) Small area systems18 Annex B (informative) Measuring equipment.19 Annex C (informative) Provision of information
20、.22 Annex D (informative) Measuring speech signals25 Annex E (informative) Basic theory and practice of audio-frequency induction-loop systems26 Annex F (informative) Calibration of field-strength meters.38 Bibliography .40 Figure C.1 Graphical symbol No.10: Inductive coupling .23 Figure E.1 Perspec
21、tive view of a loop, showing the magnetic field vector paths.27 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 parameter28 Figure E.3a Geometry of the loop and positions of measurement of
22、the field patterns shown in Figure E.3b 29 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 29 Licensed Copy: London South Bank University, London South Bank Univer
23、sity, Tue Jan 30 01:27:58 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 60118-4:2006 4 Figure E.4 Field patterns of the vertical component of the magnetic field of a horizontal loop30 Figure E.5 Field patterns of the vertical component of the magnetic field of a vertical loop31 Figure E.6 Perspectiv
24、e view of the variation of the vertical field strength level at an optimum height above a horizontal rectangular loop32 Figure E.7a Directional response of the magnetic pick-up coil of a hearing aid; linear amplitude scale .32 Figure E.7b Directional response of the magnetic pick-up coil of a hearin
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