CISPR 24:2010/AMD1:2015

Amendment 1 - Information technology equipment - Immunity characteristics - Limits and methods of measurement

Amendement 1 - Appareils de traitement de l'information - Caractéristiques d'immunité - Limites et méthodes de mesure

General Information

• Status: Withdrawn
• Publication Date: 16-Apr-2015
• Withdrawal Date: 30-Jul-2020
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 33.100.20 - Immunity
• Technical Committee: CIS/I - Electromagnetic compatibility of information technology equipment, multimedia equipment and receivers
• Current Stage: WPUB - Publication withdrawn
• Completion Date: 31-Jul-2020

Relations

• Amends: CISPR 24:2010 - Information technology equipment - Immunity characteristics - Limits and methods of measurement
• Effective Date: 05-Sep-2023

Standards Content (Sample)

CISPR 24 ®
Edition 2.0 2015-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
INT ERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
C OMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES

AMENDMENT 1
AMENDEMENT 1
Information technology equipment – Immunity characteristics – Limits and
methods of measurement
Appareils de traitement de l'information – Caractéristiques d'immunité – Limites
et méthodes de mesure
CISPR 24:2010-08/AMD1:2015-04(en-fr)

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: [phone]
3, rue de Varembé Fax: [phone]
CH-1211 Geneva 20 [e-mail]
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing more than 30 000 terms and
Technical Specifications, Technical Reports and other definitions in English and French, with equivalent terms in 15
documents. Available for PC, Mac OS, Android Tablets and additional languages. Also known as the International
iPad. Electrotechnical Vocabulary (IEV) online.

IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a More than 60 000 electrotechnical terminology entries in
variety of criteria (reference number, text, technical English and French extracted from the Terms and Definitions
committee,…). It also gives information on projects, replaced clause of IEC publications issued since 2002. Some entries
and withdrawn publications. have been collected from earlier publications of IEC TC 37,

77, 86 and CISPR.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: [e-mail].
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Catalogue IEC - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
Application autonome pour consulter tous les renseignements
Le premier dictionnaire en ligne de termes électroniques et
bibliographiques sur les Normes internationales,
électriques. Il contient plus de 30 000 termes et définitions en
Spécifications techniques, Rapports techniques et autres
anglais et en français, ainsi que les termes équivalents dans
documents de l'IEC. Disponible pour PC, Mac OS, tablettes
15 langues additionnelles. Egalement appelé Vocabulaire
Android et iPad.
Electrotechnique International (IEV) en ligne.

Recherche de publications IEC - www.iec.ch/searchpub
Glossaire IEC - std.iec.ch/glossary
Plus de 60 000 entrées terminologiques électrotechniques, en
La recherche avancée permet de trouver des publications IEC
en utilisant différents critères (numéro de référence, texte, anglais et en français, extraites des articles Termes et
comité d’études,…). Elle donne aussi des informations sur les Définitions des publications IEC parues depuis 2002. Plus
projets et les publications remplacées ou retirées. certaines entrées antérieures extraites des publications des

CE 37, 77, 86 et CISPR de l'IEC.
IEC Just Published - webstore.iec.ch/justpublished

Service Clients - webstore.iec.ch/csc
Restez informé sur les nouvelles publications IEC. Just
Published détaille les nouvelles publications parues. Si vous désirez nous donner des commentaires sur cette
Disponible en ligne et aussi une fois par mois par email. publication ou si vous avez des questions contactez-nous:
[e-mail].
CISPR 24 ®
Edition 2.0 2015-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
INT ERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE

C OMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES

AMENDMENT 1
AMENDEMENT 1
Information technology equipment – Immunity characteristics – Limits and

methods of measurement
Appareils de traitement de l'information – Caractéristiques d'immunité – Limites

et méthodes de mesure
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.100.20 ISBN 978-2-8322-2615-5

– 2 – CISPR 24:2010/AMD1:2015
© IEC 2015
FOREWORD
This amendment has been prepared by subcommittee CIS/I: Electromagnetic compatibility of
information technology equipment, multimedia equipment and receivers.
The text of this amendment is based on the following documents:
FDIS Report on voting
CIS/I/500/FDIS CIS/I/504/RVD
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 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.
_____________
4.2.1 Electrostatic discharges (ESD)
Replace the existing eighth paragraph starting with "For contact discharge…" by the following
new paragraph:
For contact discharges, there is no requirement to apply discharges at voltages below the test
level defined in Table 1.
4.2.3.1 General
Add, at the end of the existing text, the following new text:
Recognising that a 1 % step size is preferred, the frequency range can be swept incrementally
with a step size not exceeding 4 % of the previous frequency with a test level of twice the
value of the specified test level in order to reduce the testing time for equipment requiring
testing in multiple configurations and/or long cycle times.
The step size and test level used shall be recorded in the test report.

© IEC 2015
Table 3 – Immunity, input d.c. power port (excluding equipment marketed with a a.c./d.c.
power converter)
Replace the second existing line of this table by the following new line:
3.2 Surges 0,5 kV (peak) IEC 61000-4-5 Test applied B
1,2/50 (8/20) each line
Tr/Th µs
to ground
reference
b
See
Table A.1 – Criteria applied to TTE functions, used during continuous disturbances
testing
Replace the existing table by the following new table:
TTE Function Method
A.2.2 or A.2.3 A.2.4 or A.2.6 A.2.5
A1.1 Dial capability used to establish a telephony n/a n/a Yes
a
call. (See )
A1.2 Audio receiving capability via an ear piece A.2.2 or A.2.3 n/a n/a
(headset or handset etc.)
A1.3 Audio transmission capability via a n/a A.2.4 or A.2.6 n/a
microphone (headset or handset etc.)
A1.4
Hands free operation A.2.3 using n/a n/a
Figure A.3
b
A1.5 Line connection n/a A.2.4 or A.2.6 n/a
a
Only applicable to EUT that provides emergency service call capability.
b
A call shall be maintained for the duration of the test.

A.2.1 General
Replace the existing sixth paragraph starting with " Where possible…" by the following new text:
If it is suspected that the mute functions, echo cancelling capabilities, or noise cancelling
circuitry are interfering with the ability to make the measurement, then these features may be
disabled and the test performed. Where this is not possible the following method may reduce
the influence of the noise and echo cancelling functions. This is dependent on the
implementation and the resulting disturbances.
The communication path should be activated in both transmit and receive directions for
measurements during the immunity tests, however, since both receive and transmit paths may
not be active simultaneously, especially during hands-free operation, the immunity tests for
the receive path and the transmit path may need to be assessed separately.
When measurements are carried out in the receive direction, a suitable test signal (for
example 300 Hz sine wave) shall be coupled into the receive direction path. The level of this
test signal shall be high enough (for example -50 dBm) to activate the receive path and be
filtered by the band-pass filter during the immunity test.
When measurements are carried out in the transmit direction, the transmit mode shall be
activated with a loudspeaker placed at an appropriate distance from the EUT. The test signal
produced by the loudspeaker shall be loud enough for the EUT to activate the transmit path
and be filtered by the band-pass filter during the immunity test.
The mute function shall be switched off during testing by the normal procedure.

– 4 – CISPR 24:2010/AMD1:2015
© IEC 2015
NOTE These methods may not work in all cases.
The configuration of the EUT with respect to these functions shall be noted in the test report.
Add, after the existing Table A.5, the following new subclause:
A.2.6 Measurement method: demodulation sent to digital lines
For systems that connect to a digital transmission system it is not generally possible to break
into the line, as is done in A.2.4 for analogue lines, in order to measure the 1 kHz tone that is
demodulated by the EUT and sent to line during the testing of continuous RF disturbances.
This is especially the case for Voice over IP (VoIP) applications where the audio sent to line is
encoded into packets that may be sent for example via an Ethernet or DSL transmission
system.
For such digital lines a call shall be established to another telephony device, known as the
‘secondary device’. While applying the continuous RF disturbances to the EUT, the acoustic
output from the secondary device (the received audio signals from the EUT) shall be
measured using the method given in A.2.2 (See example test setup given in Figure A.6).
Where lossless acoustic coupling to the secondary device cannot be achieved then the
method of A.2.3 shall be used (See example test setup in Figure A.7). The limit levels defined
in Table A.2 or A.3 shall be applied to the respective method. It is acceptable to perform the
test twice: once while monitoring the demodulated audio levels, and again while evaluating
other performance criteria.
When using the method of A.2.3 in order to calibrate the link a 1 kHz Reference Noise Source
(RNS) shall be applied to an artificial mouth, in order to generate a known sound pressure
level of 89 dB(spl). The reference noise source is coupled to the microphone of the EUT and
the output at the receiver of the secondary device is measured. To obtain the actual reference
level, subtract 35 dB from the measured value. The background noise shall be at least 15 dB
below the established reference level. The reference noise source and artificial mouth are
then removed. The acoustic measurements are then relative to the reference level established
with the RNS.
The following points shall be considered:
• Ideally the secondary device should be the same as the EUT.
• The secondary device should be located outside of the test environment, for example in a
remote screened room or outside the test chamber and where possible in an acoustically
quiet environment.
• Cables leaving the test environment may require additional radio frequency filtering.
• The secondary device should, where applicable, be set up with the same configuration, for
example, the setting of gain, noise cancellation and volume control.
• All loudness ratings should be set to their nominal values.
• There is no need to physically break into the line in order to measure the 1 kHz tone sent
to line.
This methodology may also be considered as an alternative method for analogue lines if
required.
© I
...