EN IEC 60118-4:2015/A1:2018

SLOVENSKI STANDARD
01-april-2018
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Electroacoustics - Hearing aids - Part 4: Induction-loop systems for hearing aid purposes
- System performance requirements (IEC 60118-4:2014/A1:2017)
Akustik - Hörgeräte - Teil 4: Induktionsschleifen für Hörgeräte - Leistungsanforderungen
(IEC 60118-4:2014/A1:2017)
Électroacoustique - Appareils de correction auditive - Partie 4: Systèmes de boucles
d'induction utilisées à des fins de correction auditive - Exigences de performances
système (IEC 60118-4:2014/A1:2017)
Ta slovenski standard je istoveten z: EN IEC 60118-4:2015/A1:2018
ICS:
11.180.15 3ULSRPRþNL]DJOXKHRVHEHLQ Aids for deaf and hearing
RVHEH]RNYDURVOXKD impaired people
17.140.50 Elektroakustika Electroacoustics
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60118-4:2015/A1

NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2018
ICS 17.140.50
English Version
Electroacoustics - Hearing aids - Part 4: Induction-loop systems
for hearing aid purposes - System performance requirements
(IEC 60118-4:2014/A1:2017)
Électroacoustique - Appareils de correction auditive - Partie Akustik - Hörgeräte - Teil 4: Induktionsschleifen für
4: Systèmes de boucles d'induction utilisées à des fins de Hörgeräte - Leistungsanforderungen
correction auditive - Exigences de performances système (IEC 60118-4:2014/A1:2017)
(IEC 60118-4:2014/A1:2017)
This amendment A1 modifies the European Standard EN 60118-4:2015; it was approved by CENELEC on 2017-12-14. CENELEC
members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this amendment 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 amendment 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, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 60118-4:2015/A1:2018 E

European foreword
The text of document 29/952/CDV, future edition 1 of IEC 60118-4:2014/A1:2017, prepared by
IEC/TC 29 "Electroacoustics" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 60118-4:2015/A1:2018.

The following dates are fixed:
(dop) 2018-09-14
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2020-12-14
standards conflicting with the
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 60118-4:2014/A1:2017 was approved by CENELEC as a
European Standard without any modification.
IEC 60118-4 ®
Edition 3.0 2017-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Electroacoustics – Hearing aids –

Part 4: Induction-loop systems for hearing aid purposes – System performance

requirements
Électroacoustique – Appareils de correction auditive –

Partie 4: Systèmes de boucles d'induction utilisées à des fins de correction

auditive – Exigences de performances système

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.140.50 ISBN 978-2-8322-4970-3

– 2 – IEC 60118-4:2014/AMD1:2017
IEC 2017
FOREWORD
This amendment has been prepared by committee IEC technical committee 29:
Electroacoustics.
The text of this amendment is based on the following documents:
CDV Report on voting
29/952/CDV 29/961/RVC
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the stability date indicated on the IEC website 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.
_____________
3 Terms and definitions
Add, after 3.3, the following new term and definition:
3.4
automatic gain control
AGC
process or device by which the gain of an amplifier is controlled by the level of the output
signal so as to reduce changes in this level as compared with the changes in the input signal
Note 1 to entry: Frequently, automatic gain control is used to keep the output signal level nearly constant.
Note 2 to entry: There is a consistent but more general definition in IEC 60118-7, but this standard may have a
limited future, so the IEV definition is preferred.
9 Small-volume systems
Replace the existing text of Clause 9 by the following new text:
9.1 Definition of measurement points
For small-volume systems, it is possible and necessary in some applications to specify in this
standard the positions of the measurement points. For this reason, points are specified for
both disabled refuge and similar call points, and for counter systems. However, where these
suggested measurement points are not practical, the "useful magnetic field volume" method

IEC 60118-4:2014/AMD1:2017 – 3 –
IEC 2017
as defined in 9.4 can be applied, the details of which should be agreed as part of the
contractual requirements.
9.2 Disabled refuge and similar call-points
Measurements shall be made at the six points specified in Figures 2 a) and b). The reference
point (or line) is the face or surface of the call point, intercom, or help point closest to the
user, and is not necessarily the location of the magnetic field source.
The semi-circular layout is suitable for small magnetic field sources and the rectangular layout
is suitable for vertical or floor loop sources. Only one of the methods shall be used for a given
system.
NOTE An offset (shown as l in Figure 2) between the reference point (or line) and the position of the magnetic
field source promotes evenness of field pattern over the area where people are expected to stand.

– 4 – IEC 60118-4:2014/AMD1:2017
IEC 2017
l
l
45° 45°
IEC
Key
1 magnetic field source
2 reference point
3 area where people are expected to stand
l offset
l inner radius: 300 mm
l +l outer radius: 500 mm
2 3
a) Magnetic field source of small dimensions

l
= =
3 3
= =
l
IEC
Key
1 magnetic field source (vertical loop)
2 reference line
3 area where people are expected to stand
l offset
l 300 mm
l 200 mm
l 424 mm
l 700 mm
b) Larger magnetic field source
Figure 2 – Measurement points for disabled refuge
and similar call-points
l
l l l
3 2 1
IEC 60118-4:2014/AMD1:2017 – 5 –
IEC 2017
The six measurement points are required at 1,2 m and 1,7 m (see Figure 3 b)), but there is no
requirement to measure at 1,45 m.
9.3 Counter systems
Measurements shall be made at the points specified in Figures 3 a) and b). The reference
point is the face or surface of the counter closest to the user, and is not necessarily the
position of the magnetic field source. For counter systems, there is often a requirement to
control overspill to an adjacent counter position. Controlling this overspill is likely to be a
significant factor in design, and as such may result in a compromise of evenness of field over
the area where people are expected to stand.
NOTE 1 It is not necessary to reduce the magnetic spill between counter positions below a level comparable with
the acoustic spill. A difference greater than 20 dB between equivalent positions at the two counters is normally
enough.
NOTE 2 The boundaries of the area where people are expected to stand cannot be standardized as they depend
on the building layout and counter design.
NOTE 3 For vertical loops, an offset (shown as l in Figure 3) between the reference point and the position of the
loop promotes evenness of field pattern over the area where people are expected to stand, but reduces the
effectiveness of overspill control to the next counter position.

– 6 – IEC 60118-4:2014/AMD1:2017
IEC 2017
l l
1 2
3 3
l l
4 5
IEC
Key
1 ma
...