SIST EN 62489-2:2011

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 62489-2:2011)

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 (IEC 62489-2:2011)

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 (CEI 62489-2:2011)

La CEI 62489-2:2011 s'applique aux systèmes de boucles d'induction audiofréquences pour améliorer l'audition. Elle peut également être appliquée à des types de 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 en situation. La présente norme ne traite pas d'autres aspects de la sécurité, pour laquelle la CEI 60065 s'applique ni de la CEM.

Elektroakustika - Sistemi z avdiofrekvenčno indukcijsko zanko za slušne pripomočke - 2. del: Metode za računanje in merjenje nizkofrekvenčnih sevanj magnetnega polja iz zanke pri ocenjevanju skladnosti s smernicami o omejitvi izpostavljenosti ljudi (IEC 62489-2:2011)

Ta del IEC 62489 velja za komponente sistemov z avdiofrekvenčno indukcijsko zanko za slušne pripomočke. Do obsega, kot se lahko uporabi, lahko velja tudi za sisteme, ki se uporabljajo za druge namene. Standard je namenjen ocenjevanju izpostavljenosti ljudi nizkofrekvenčnim magnetnim poljem, ki jih proizvaja ta sistem, z izračunom in preskušanjem in situ. Ta standard ne obravnava drugih vidikov varnosti, za katere velja IEC 60065, ali elektromagnetne združljivosti.

General Information

• Status: Withdrawn
• Publication Date: 17-Mar-2011
• Withdrawal Date: 11-Dec-2017
• ICS: 11.180.15 - Aids for deaf and hearing impaired people
• ICS: 17.140.50 - Electroacoustics
• Technical Committee: I11 - Imaginarni 11
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 12-Dec-2017
• Due Date: 04-Jan-2018
• Completion Date: 12-Dec-2017
• Ref Project: EN 62489-2:2011 - 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

Relations

• Revised: SIST EN 62489-2:2014 - 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
• Effective Date: 06-May-2014
• Replaced By: SIST EN 62489-2:2014 - 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
• Effective Date: 28-Jan-2023
• Replaced By: SIST EN 62489-2:2014 - 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
• Effective Date: 23-Jul-2013

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 62489-2:2011
01-maj-2011
(OHNWURDNXVWLND6LVWHPL]DYGLRIUHNYHQþQRLQGXNFLMVNR]DQNR]DVOXãQH
SULSRPRþNHGHO0HWRGH]DUDþXQDQMHLQPHUMHQMHQL]NRIUHNYHQþQLKVHYDQM
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 (IEC
62489-2:2011)
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 (IEC 62489-2:2011)
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 (CEI 62489-2:2011)
Ta slovenski standard je istoveten z: EN 62489-2:2011
ICS:
11.180.15 3ULSRPRþNL]DJOXKHRVHEHLQ Aids for deaf and hearing
RVHEH]RNYDURVOXKD impaired people
17.140.50 Elektroakustika Electroacoustics
SIST EN 62489-2:2011 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST EN 62489-2:2011

---------------------- Page: 2 ----------------------

SIST EN 62489-2:2011

EUROPEAN STANDARD
EN 62489-2

NORME EUROPÉENNE
March 2011
EUROPÄISCHE NORM

ICS 17.140.50


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 62489-2:2011)

Electroacoustique -  Akustik -
Systèmes de boucles d'induction Audiofrequenz-Induktionsschleifenanlagen
audiofréquences zur Unterstützung von Hörsystemen -
pour améliorer l'audition - Teil 2: Verfahren zur Berechnung und
Partie 2: Méthodes de calcul et de mesure Messung der niederfrequenten
des émissions de champ magnétique Emissionen des durch die Schleife
basse fréquence à partir de la boucle pour erzeugten Magnetfeldes zur Einschätzung
l'évaluation de la conformité aux der Konformität mit Richtlinien zu
instructions sur les limites d'exposition Grenzwerten für die Belastung des
humaine Menschen
(CEI 62489-2:2011) (IEC 62489-2:2011)


This European Standard was approved by CENELEC on 2011-03-02. 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, Bulgaria, Croatia, 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

Management Centre: Avenue Marnix 17, B - 1000 Brussels


© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62489-2:2011 E

---------------------- Page: 3 ----------------------

SIST EN 62489-2:2011
EN 62489-2:2011 - 2 -
Foreword
The text of document 29/728/FDIS, future edition 1 of IEC 62489-2, prepared by IEC TC 29,
Electroacoustics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
EN 62489-2 on 2011-03-02.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2011-12-02
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2014-03-02
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62489-2:2011 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 62226-1 NOTE  Harmonized as EN 62226-1.
IEC 62233 NOTE  Harmonized as EN 62233.
__________

---------------------- Page: 4 ----------------------

SIST EN 62489-2:2011
- 3 - EN 62489-2:2011
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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year

IEC 60118-4 - Electroacoustics - Hearing aids - EN 60118-4 -
Part 4: Induction loop systems for hearing aid
purposes - Magnetic field strength


IEC 60268-1 - Sound system equipment - HD 483.1 S2 -
Part 1: General


IEC 60268-2 - Sound system equipment - HD 483.2 S2 -
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


IEC 61786 - Measurement of low-frequency magnetic and - -
electric fields with regard to exposure of
human beings - Special requirements for
instruments and guidance for measurement


IEC 62226-2-1 2004 Exposure to electric or magnetic fields in the EN 62226-2-1 2005
low and intermediate frequency range -
Methods for calculating the current density
and internal electric field induced in the
human body -
Part 2-1: Exposure to magnetic fields -
2D models


IEC 62311 (mod) 2007 Assessment of electronic and electrical EN 62311 2008
equipment related to human exposure
restrictions for electromagnetic fields
(0 Hz - 300 GHz)

---------------------- Page: 5 ----------------------

SIST EN 62489-2:2011

---------------------- Page: 6 ----------------------

SIST EN 62489-2:2011
IEC 62489-2
®

Edition 1.0 2011-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


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

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

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX Q
ICS 17.140.50 ISBN 978-2-88912-318-6
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

---------------------- Page: 7 ----------------------

SIST EN 62489-2:2011
– 2 – 62489-2  IEC:2011

CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Rated values . 5
4 Situation regarding current standards . 6
5 Configurations of loops . 6
5.1 Main types of configuration . 6
5.2 General considerations . 6
5.3 Large-area loops . 6
5.4 Medium-area loops . 7
5.5 Small-area loops . 7
5.6 Solenoid antennas . 7
6 Calculations . 8
6.1 General . 8
6.2 Solenoid antennas . 8
7 Measurements . 8
7.1 General . 8
7.2 Input signal . 8
7.3 Measuring instrument . 9
8 Comparison of calculated or measured results with guidelines or limits . 9
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
Annex B (informative) Example calculation using the coupling factor K . 15
Bibliography . 16

Figure 1 – An earhook induction transducer, with a BTE (Behind The Ear) hearing aid
body for scale . 7
Figure 2 – K factor as a function of least distance between wire and disc . 10
Figure A.1 – ICNIRP magnetic field reference levels . 11

Table A.1 – Extract from IEC 62311, Table A.1 – Characteristics and parameters of the
equipment to be considered, with the application to AFILS added . 13

---------------------- Page: 8 ----------------------

SIST EN 62489-2:2011
62489-2  IEC:2011 – 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.
The text of this standard is based on the following documents:
FDIS Report on voting
29/728/FDIS 29/736/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.

---------------------- Page: 9 ----------------------

SIST EN 62489-2:2011
– 4 – 62489-2  IEC:2011
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.

---------------------- Page: 10 ----------------------

SIST EN 62489-2:2011
62489-2  IEC:2011 – 5 –
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 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.
IEC 60118-4, Electroacoustics – Hearing aids – Part 4: Induction loop systems for hearing aid
purposes – Magnetic field strength
IEC 60268-1, Sound system equipment – Part 1: General
IEC 60268-2, 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
IEC 61786, Measurement of low-frequency magnetic and electric fields with regard to
exposure of human beings – Special requirements for instruments and guidance for
measurements
IEC 62226-2-1:2004, Exposure to electric or magnetic fields in the low and intermediate
frequency range – Methods for calculating the current density and internal electric field
induced in the human body – Part 2-1: Exposure to magnetic fields – 2D models
IEC 62311:2007, Assessment of electronic and electrical equipment related to human
exposure restrictions for electromagnetic fields (0 Hz – 300 GHz)
3 Rated values
The term rated means 'the value stated by the manufacturer'. Rated values are of two kinds:
rated conditions, fundamental values that cannot be verified by measurement, and others that
can be so verified. For a full explanation, see IEC 60268-2.

---------------------- Page: 11 ----------------------

SIST EN 62489-2:2011
– 6 – 62489-2  IEC:2011
4 Situation regarding current standards
Current published and draft IEC standards on EMF exposure do not give unambiguous
guidance on the approach that should be taken by product committees. The differences
between the signals that we are concerned with and those considered in depth in EMF
exposure standards are the following:
• wide relative bandwidth (ratio of highest to lowest frequency present, 100 Hz to 5 kHz);
• no predominant frequency within the band;
• rapidly-varying amplitude;
• high ratio of peak amplitude to average r.m.s. amplitude (at least 4).
5 Configurations of loops
5.1 Main types of configuration
There are four main types of configuration:
a) large area loops, with the smallest dimension larger than 1 m, usually installed at floor
level in a room;
b) medium-area loops, with dimensions of the order of 1 m, often oriented in a vertical plane,
installed at service desks and similar positions;
c) small area loops, with the largest dimension less than 1 m;
d) solenoid antennas, including the ear-hook.
NOTE Examples of small-area loops are portable systems, clipboards, neck loops, cushion loops (including those
for use in vehicles) and chair loops.
5.2 General considerations
All loops produce strong fields close to the loop conductor(s). This is shown by the
relationship between current I in a long, straight wire and the magnetic field strength H
produced at a distance R from the centre of the wire, where R is greater than the radius r of
the wire:
H = I/2πR (1)

NOTE 1 Within the wire, the field strength decreases linearly from I/2πr at the surface to zero at the centre.
NOTE 2 For n parallel condu
...