IEC 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

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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

– 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

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
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