Electroacoustics - Audio-frequency induction loop systems for assisted hearing - Part 2: Methods of calculating and measuring the low-frequency magnetic field emissions from the loop for assessing conformity with guidelines on limits for human exposure

This part of IEC 62489 applies to audio-frequency induction-loop systems for assisted
hearing. It may also be applied to such systems used for other purposes, as far as it is
applicable. The standard is intended for assessment of human exposure to low-frequency
magnetic fields produced by the system, by calculation and by in-situ testing.
This standard does not deal with other aspects of safety, for which IEC 60065 applies, or with
EMC.

Akustik - Audiofrequenz-Induktionsschleifenanlagen zur Unterstützung von Hörsystemen - Teil 2: Verfahren zur Berechnung und Messung der niederfrequenten Emissionen des durch die Schleife erzeugten Magnetfeldes zur Einschätzung der Konformität mit Richtlinien zu Grenzwerten für die Belastung des Menschen

Electroacoustique - Systèmes de boucles d'induction audiofréquences pour améliorer l'audition - Partie 2: Méthodes de calcul et de mesure des émissions de champ magnétique basse fréquence à partir de la boucle pour l’évaluation de la conformité aux instructions sur les limites d’exposition humaine

L'IEC 62489-2:2014 s'applique aux systèmes de boucles d'induction audiofréquences pour améliorer l'audition. Elle peut également être appliquée à de tels systèmes utilisés à d'autres fins, si ladite application est possible. La norme est destinée à l'évaluation de l'exposition humaine à des champs magnétiques basse fréquence produits par le système, par le calcul et par l'essai in-situ. La présente norme ne traite pas d'autres aspects de la sécurité, pour laquelle l'IEC 60065 s'applique, ni de la CEM. Cette deuxième édition annule et remplace la première édition parue en 2011. Cette édition constitue une révision technique qui inclut les modifications techniques majeures afin de refleter plusieurs mises à jour du Guide ICNIRP (Guidelines for limiting exposure to time-varying electric, magnetic, and electromagnetic fields) auquel il est fait fréquemment référence. Le changement le plus significatif est que la grandeur de base dans le guide est passée d'une densité de courant dans les tissus à un champ électrique induit. Mots clé: accessibilité, sonotone, surdité

Elektroakustika - Sistemi z avdiofrekvenčno indukcijsko zanko za slušne pripomočke - 2. del: Metode za računanje in merjenje nizkofrekvenčnega sevanja magnetnega polja iz zanke pri ocenjevanju skladnosti s smernicami o omejitvi izpostavljenosti ljudi (IEC 62489-2:2014)

Ta del standarda IEC 62489 se uporablja za sisteme z avdiofrekvenčno indukcijsko zanko za slušne pripomočke. Uporablja se lahko tudi za takšne sisteme, ki se uporabljajo za druge namene, v kolikor je to primerno. Standard je namenjen za ocenjevanje izpostavljenosti ljudi nizkofrekvenčnim magnetnim poljem, ki jih proizvaja sistem, in sicer z izračunom ali preskusom na kraju samem. Ta standard ne obravnava drugih vidikov varnosti, za katere velja standard IEC 60065, ali elektromagnetne združljivosti (EMC).

General Information

Status
Published
Publication Date
13-Nov-2014
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
04-Nov-2014
Due Date
09-Jan-2015
Completion Date
14-Nov-2014

RELATIONS

Buy Standard

Standard
SIST EN 62489-2:2014
English language
17 pages
sale 10% off
Preview
sale 10% off
Preview

e-Library read for
1 day

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN 62489-2:2014
01-december-2014
1DGRPHãþD
SIST EN 62489-2:2011
(OHNWURDNXVWLND6LVWHPL]DYGLRIUHNYHQþQRLQGXNFLMVNR]DQNR]DVOXãQH
SULSRPRþNHGHO0HWRGH]DUDþXQDQMHLQPHUMHQMHQL]NRIUHNYHQþQHJDVHYDQMD
PDJQHWQHJDSROMDL]]DQNHSULRFHQMHYDQMXVNODGQRVWLVVPHUQLFDPLRRPHMLWYL
L]SRVWDYOMHQRVWLOMXGL ,(&

Electroacoustics - Audio-frequency induction loop systems for assisted hearing - Part 2:

Methods of calculating and measuring the low-frequency magnetic field emissions from

the loop for assessing conformity with guidelines on limits for human exposure
Ta slovenski standard je istoveten z: EN 62489-2:2014
ICS:
11.180.15 3ULSRPRþNL]DJOXKHRVHEHLQ Aids for deaf and hearing
RVHEH]RNYDURVOXKD impaired people
17.140.50 Elektroakustika Electroacoustics
SIST EN 62489-2:2014 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 62489-2:2014
---------------------- Page: 2 ----------------------
SIST EN 62489-2:2014
EUROPEAN STANDARD EN 62489-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2014
ICS 17.140.50 Supersedes EN 62489-2:2011
English Version
Electroacoustics - Audio-frequency induction loop systems for
assisted hearing - Part 2: Methods of calculating and measuring
the low-frequency magnetic field emissions from the loop for
assessing conformity with guidelines on limits for human
exposure
(IEC 62489-2:2014)

Electroacoustique - Systèmes de boucles d'induction Akustik - Audiofrequenz-Induktionsschleifenanlagen zur

audiofréquences pour améliorer l'audition - Partie 2: Unterstützung von Hörsystemen - Teil 2: Verfahren zur

Méthodes de calcul et de mesure des émissions de champ Berechnung und Messung der niederfrequenten

magnétique basse fréquence à partir de la boucle pour Emissionen des durch die Schleife erzeugten Magnetfeldes

l'évaluation de la conformité aux instructions sur les limites zur Einschätzung der Konformität mit Richtlinien zu

d'exposition humaine Grenzwerten für die Belastung des Menschen
(CEI 62489-2:2014) (IEC 62489-2:2014)

This European Standard was approved by CENELEC on 2014-10-29. 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 CEN-CENELEC

Management Centre 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 CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 62489-2:2014 E
---------------------- Page: 3 ----------------------
SIST EN 62489-2:2014
EN 62489-2:2014 - 2 -
Foreword

The text of document 29/847/FDIS, future edition 2 of IEC 62489-2, prepared by IEC/TC 29

"Electroacoustics" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as

EN 62489-2:2014.
The following dates are fixed:
(dop) 2015-07-29
• latest date by which the document has to be implemented at
national level by publication of an identical national
standard or by endorsement
(dow) 2017-10-29
• latest date by which the national standards conflicting with
the document have to be withdrawn
This document supersedes EN 62489-2:2011.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such

patent rights.
Endorsement notice

The text of the International Standard IEC 62489-2:2014 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 62233 NOTE Harmonized as EN 62233.
IEC 62311:2007 NOTE Harmonized as EN 62311:2008 (modified).
---------------------- Page: 4 ----------------------
SIST EN 62489-2:2014
- 3 - EN 62489-2:2014
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod),

the relevant EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is

available here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60118-4 2006 Electroacoustics - Hearing aids - EN 60118-4 2006
Part 4: Induction loop systems for hearing
aid purposes - Magnetic field strength
IEC 60268-1 1985 Sound system equipment - HD 483.1 S2 1989
Part 1: General
IEC 60268-2 1987 Sound system equipment - HD 483.2 S2 1993
Part 2: Explanation of general terms and
calculation methods
IEC 60268-10 1991 Sound system equipment - HD 483.10 S1 1993
Part 10: Peak programme level meters
---------------------- Page: 5 ----------------------
SIST EN 62489-2:2014
---------------------- Page: 6 ----------------------
SIST EN 62489-2:2014
IEC 62489-2
Edition 2.0 2014-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electroacoustics – Audio-frequency induction loop systems for assisted
hearing –
Part 2: Methods of calculating and measuring the low-frequency magnetic field
emissions from the loop for assessing conformity with guidelines on limits for
human exposure
Électroacoustique – Systèmes de boucles d’induction audiofréquences pour
améliorer l'audition –
Partie 2: Méthodes de calcul et de mesure des émissions de champ magnétique
basse fréquence à partir de la boucle pour l’évaluation de la conformité aux
instructions sur les limites d’exposition humaine
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX P
ICS 17.140.50 ISBN 978-2-8322-1860-0

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN 62489-2:2014
– 2 – IEC 62489-2:2014 © IEC 2014
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Rated values ................................................................................................................... 6

4 Situation regarding current standards .............................................................................. 6

5 Configurations of loops .................................................................................................... 7

5.1 Main types of configuration ..................................................................................... 7

5.2 General considerations ........................................................................................... 7

5.3 Large-area loops ..................................................................................................... 7

5.4 Medium-area loops ................................................................................................. 7

5.5 Small-area loops ..................................................................................................... 8

5.6 Solenoid antennas .................................................................................................. 8

6 Calculations ..................................................................................................................... 8

6.1 General ................................................................................................................... 8

6.2 Solenoid antennas .................................................................................................. 9

7 Measurements ................................................................................................................. 9

7.1 General ................................................................................................................... 9

7.2 Input signal ............................................................................................................. 9

7.3 Measuring instrument.............................................................................................. 9

8 Comparison of calculated or measured results with guidelines or limits ......................... 10

9 Meeting limits or guidelines ........................................................................................... 10

10 Measurement uncertainty .............................................................................................. 10

Annex A (informative) Rationale for this product-family magnetic field emission

standard for audio-frequency induction-loop systems (AFILS) in the context of human

exposure to non-ionizing radiation ........................................................................................ 11

Bibliography .......................................................................................................................... 14

Figure 1 – An ear-hook induction transducer, with a BTE (behind the ear) hearing aid

body for scale ......................................................................................................................... 8

Figure A.1 – ICNIRP magnetic field reference levels ............................................................. 11

Table 1 – Basic restrictions ................................................................................................... 10

Table A.1 – Application to AFILS of Table 1 of IEC 62311:2007 "Characteristics and

parameters of the equipment to be considered" .................................................................... 12

---------------------- Page: 8 ----------------------
SIST EN 62489-2:2014
IEC 62489-2:2014 © IEC 2014 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROACOUSTICS –
AUDIO-FREQUENCY INDUCTION
LOOP SYSTEMS FOR ASSISTED HEARING –
Part 2: Methods of calculating and measuring the low-frequency
magnetic field emissions from the loop for assessing conformity
with guidelines on limits for human exposure
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

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

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

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 62489-2 has been prepared by IEC technical committee 29:

Electroacoustics.

This second edition cancels and replaces the first edition published in 2011. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition: it reflects several updates to the ICNIRP Guide [1] to which it makes frequent

________________
Numbers in square brackets refer to the Bibliography.
---------------------- Page: 9 ----------------------
SIST EN 62489-2:2014
– 4 – IEC 62489-2:2014 © IEC 2014

reference. The most significant change is that the underlying metric in the Guide has been

changed from tissue current density to induced electric field.
The text of this standard is based on the following documents:
FDIS Report on voting
29/847/FDIS 29/854/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts of the IEC 62489 series, published under the general title Electroacoustics –

Audio-frequency induction loop systems for assisted hearing, can be found on the IEC

website.

The committee has decided that the contents of this publication will remain unchanged until

the stability 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.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
---------------------- Page: 10 ----------------------
SIST EN 62489-2:2014
IEC 62489-2:2014 © IEC 2014 – 5 –
INTRODUCTION

A revision of IEC 62489-2 is necessary because, while the standard does not call up any

particular set of exposure limits, it has numerous references to the ICNIRP Guide, which has

profoundly changed between the 1998 and 2010 editions. This has resulted in a change in the

physical quantity on which the basic restrictions are established, from tissue current density to

induced electric field, resulting in changes to the reference levels and a considerable

simplification of the application of the guidelines.

The recommendations of the new Guide have not yet been adopted at the regulatory level in

the European Union. However, since the references to the Guide in IEC 62489-2 are purely

informative, it does not appear that this revision should be unacceptable in Europe.

---------------------- Page: 11 ----------------------
SIST EN 62489-2:2014
– 6 – IEC 62489-2:2014 © IEC 2014
ELECTROACOUSTICS –
AUDIO-FREQUENCY INDUCTION
LOOP SYSTEMS FOR ASSISTED HEARING –
Part 2: Methods of calculating and measuring the low-frequency
magnetic field emissions from the loop for assessing conformity
with guidelines on limits for human exposure
1 Scope

This part of IEC 62489 applies to audio-frequency induction-loop systems for assisted

hearing. It may also be applied to such systems used for other purposes, as far as it is

applicable. The standard is intended for assessment of human exposure to low-frequency

magnetic fields produced by the system, by calculation and by in-situ testing.

This standard does not deal with other aspects of safety, for which IEC 60065 applies, or with

EMC.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any
amendments) applies.

IEC 60118-4:2006, Electroacoustics - Hearing aids - Part 4: Induction loop systems for

hearing aid purposes - Magnetic field strength
IEC 60268-1:1985, Sound system equipment – Part 1: General

IEC 60268-2:1987, Sound system equipment – Part 2: Explanation of general terms and

calculation methods
IEC 60268-10:1991, Sound system equipment – Part 10: Peak programme level meters
3 Rated values

The term "rated" means "the value stated by the manufacturer". Rated values are of two

kinds: rated conditions, which are fundamental values that cannot be verified by

measurement, and others that can be so verified. For a full explanation, see IEC 60268-2.

4 Situation regarding current standards

Current published and draft IEC standards on EMF exposure can be ambiguous in their

guidance on the approach that should be taken by product committe
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.