SIST EN 61000-4-31:2017

Electromagnetic Compatibility (EMC) - Part 4-31: Testing and measurement techniques - AC mains ports broadband conducted disturbance immunity test

This part of IEC 61000 relates to the conducted immunity of electrical and electronic
equipment to electromagnetic disturbances coming from intended and/or unintended
broadband signal sources in the frequency range 150 kHz up to 80 MHz.
The object of this standard is to establish a common reference to evaluate the immunity of
electrical and electronic equipment when subjected to conducted disturbances caused by
intended and/or unintended broadband signal sources on AC mains ports. The test method
documented in this standard describes a consistent method to assess the immunity of an
equipment or system against a defined phenomenon.
Equipment not having at least one AC mains port is excluded. The power ports not intended
to be connected to AC mains distribution networks are not considered as “AC mains ports”
and therefore are excluded.
This standard is applicable only to single phase equipment having rated input current ≤ 16 A;
the application of the broadband disturbance to multiple phase equipment and/or equipment
with rated input current > 16 A is under consideration.
NOTE As described in IEC Guide 107, this standard is a basic EMC publication for use by product committees of
the IEC. As also stated in Guide 107, the IEC product committees are responsible for determining whether this
immunity test standard is to be applied or not, and if applied, they are responsible for determining the appropriate
test levels and performance criteria. TC 77 and its sub-committees are prepared to co-operate with product
committees in the evaluation of the value of particular immunity tests for their products.

Elektromagnetische Verträglichkeit (EMV) - Teil 4-31: Prüf- und Messverfahren - Prüfung der Störfestigkeit gegen leitungsgeführte breitbandige Störgrößen an Wechselstrom-Netzanschlüssen

Compatibilité électromagnétique (CEM) - Partie 4-31: Techniques d'essai et de mesure - Essai d'immunité aux perturbations conduites à large bande sur les accès d'alimentation secteur en courant alternatif

L'IEC 61000-4-31:2016 se rapporte à l'immunité en conduction des matériels électriques et électroniques aux perturbations électromagnétiques provoquées par des sources de signaux à large bande volontaires et/ou involontaires dans la plage de fréquences de 150 kHz à 80 MHz. Elle a le statut d'une publication fondamentale en CEM conformément au Guide IEC 107.

Elektromagnetna združljivost (EMC) - 4-31. del: Preskusne in merilne tehnike - Preskus odpornosti konektorjev izmeničnega napajanja proti širokopasovnim motnjam po vodnikih

Ta del standarda IEC 61000 se nanaša na prevodno odpornost električne in elektronske opreme na elektromagnetne motnje, ki jih povzročajo predvideni in/ali nepredvideni viri širokopasovnih signalov v frekvenčnem območju od 150 kHz do 80 MHz.
Namen tega standarda je določiti skupno referenco za vrednotenje odpornosti električne in elektronske opreme, izpostavljene prevodnim motnjam, ki jih povzročajo predvideni in/ali nepredvideni viri širokopasovnih signalov pri konektorjih izmeničnega napajanja. Preskusna metoda, dokumentirana v tem standardu, opisuje skladno metodo za oceno odpornosti opreme ali sistema proti opredeljenemu pojavu.
Oprema, ki ne vključuje vsaj enega konektorja izmeničnega napajanja, ni zajeta. Napajalni konektorji, ki niso namenjeni za povezavo z razdelilnimi omrežji izmeničnega napajanja, se ne obravnavajo kot »konektorji izmeničnega napajanja« in so zato izključeni.
Ta standard se uporablja samo za enofazno opremo z nazivnim vhodnim tokom ≤ 16 A in ne obravnava učinkov širokopasovnih motenj na večfazno opremo in/ali opremo z nazivnim vhodnim tokom > 16 A.
OPOMBA: Ta standard je osnovna objava o elektromagnetni združljivosti, ki jo uporabljajo tehnični odbori v okviru Mednarodne elektrotehniške komisije (IEC), kot je opisano v vodilu 107 Mednarodne elektrotehniške komisije. Poleg tega je v vodilu 107 navedeno, da so tehnični odbori v okviru Mednarodne elektrotehniške komisije odgovorni za določitev morebitne uporabe tega standarda s preskusom odpornosti, v primeru uporabe pa so odgovorni za določitev ustreznih preskusnih ravni in meril učinkovitosti. Odbor TC 77 in njegovi pododbori so pripravljeni za sodelovanje s tehničnimi odbori pri vrednotenju posameznih preskusov odpornosti za ustrezne izdelke.

General Information

• Status: Published
• Publication Date: 16-Mar-2017
• ICS: 33.100.20 - Immunity
• Technical Committee: EMC - Electromagnetic compatibility
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 03-Mar-2017
• Due Date: 08-May-2017
• Completion Date: 17-Mar-2017
• Ref Project: EN 61000-4-31:2017 - Electromagnetic compatibility (EMC) - Part 4-31: Testing and measurement techniques - AC mains ports broadband conducted disturbance immunity test

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 61000-4-31:2017
01-april-2017
(OHNWURPDJQHWQD]GUXåOMLYRVW(0&GHO3UHVNXVQHLQPHULOQHWHKQLNH
3UHVNXVRGSRUQRVWLNRQHNWRUMHYL]PHQLþQHJDQDSDMDQMDSURWLãLURNRSDVRYQLP
PRWQMDPSRYRGQLNLK
Electromagnetic Compatibility (EMC) - Part 4-31: Testing and measurement techniques -
AC mains ports broadband conducted disturbance immunity test
Compatibilité électromagnétique (CEM) - Partie 4-31: Techniques d'essai et de mesure -
Essai d'immunité aux perturbations conduites à large bande sur les accès d'alimentation
secteur en courant alternatif
Ta slovenski standard je istoveten z: EN 61000-4-31:2017
ICS:
33.100.20 Imunost Immunity
SIST EN 61000-4-31:2017 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61000-4-31:2017

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SIST EN 61000-4-31:2017


EUROPEAN STANDARD EN 61000-4-31

NORME EUROPÉENNE

EUROPÄISCHE NORM
February 2017
ICS 33.100.20

English Version
Electromagnetic compatibility (EMC) -
Part 4-31: Testing and measurement techniques - AC mains
ports broadband conducted disturbance immunity test
(IEC 61000-4-31:2016)
Compatibilité électromagnétique (CEM) -  Elektromagnetische Verträglichkeit (EMV) -
Partie 4-31: Techniques d'essai et de mesure - Essai Teil 4-31: Prüf- und Messverfahren - Prüfung der
d'immunité aux perturbations conduites à large bande sur Störfestigkeit gegen leitungsgeführte breitbandige
les accès d'alimentation secteur en courant alternative Störgrößen an Wechselstrom-Netzanschlüssen
(IEC 61000-4-31:2016) (IEC 61000-4-31:2016)
This European Standard was approved by CENELEC on 2016-09-01. 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, 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: Avenue Marnix 17, B-1000 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 61000-4-31:2017 E

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SIST EN 61000-4-31:2017
EN 61000-4-31:2017
European foreword
The text of document 77B/758/FDIS, future edition 1 of IEC 61000-4-31, prepared by SC 77B “High
frequency phenomena” of IEC/TC 77 “Electromagnetic compatibility" was submitted to the
IEC-CENELEC parallel vote and approved by CENELEC as EN 61000-4-31:2017.

The following dates are fixed:
(dop) 2017-08-24
• 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) 2020-02-24
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 [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 61000-4-31:2016 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:

CISPR 16-1-2 NOTE Harmonized as EN 55016-1-2.
2

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SIST EN 61000-4-31:2017
EN 61000-4-31:2017
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 60050-161 -  International Electrotechnical Vocabulary - -
(IEV) -
Chapter 161: Electromagnetic compatibility
IEC 61000-4-6 2013 Electromagnetic compatibility (EMC) - EN 61000-4-6 2014
Part 4-6: Testing and measurement
techniques - Immunity to conducted
disturbances, induced by radio-frequency
fields

3

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SIST EN 61000-4-31:2017

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SIST EN 61000-4-31:2017




IEC 61000-4-31

®


Edition 1.0 2016-07




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE
colour

inside



BASIC EMC PUBLICATION

PUBLICATION FONDAMENTALE EN CEM






Electromagnetic compatibility (EMC) –

Part 4-31: Testing and measurement techniques – AC mains ports broadband

conducted disturbance immunity test




Compatibilité électromagnétique (CEM) –

Partie 4-31: Techniques d'essai et de mesure – Essai d'immunité aux


perturbations conduites à large bande sur les accès d'alimentation secteur en

courant alternatif












INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 33.100.20 ISBN 978-2-8322-3564-5



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

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SIST EN 61000-4-31:2017
– 2 – IEC 61000-4-31:2016 © IEC 2016
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope and object . 8
2 Normative references. 8
3 Terms and definitions . 8
4 General . 10
5 Test levels . 11
6 Test equipment and level setting procedures . 13
6.1 Test generator . 13
6.2 Coupling and decoupling devices . 14
6.2.1 General . 14
6.2.2 CDND for the port under test . 15
6.2.3 Coupling/decoupling networks (CDNs) for cables that are not under test . 15
6.3 Verification of the test systems . 17
6.3.1 General . 17
6.3.2 Verification procedure of test generator flatness . 17
6.3.3 Verification procedure of the insertion loss of the CDND using
transformer jigs . 18
6.3.4 Insertion loss of the injection coupling system . 20
6.4 Test level setting procedure . 21
6.4.1 General . 21
6.4.2 Setting of the output level at the EUT port of the CDND . 21
7 Test set-up and injection methods . 22
7.1 Test set-up. 22
7.2 EUT comprised of a single unit . 22
7.3 EUT comprised of several units . 23
7.4 CDN and CDND termination application . 25
8 Test procedure . 26
9 Evaluation of the test results . 27
10 Test report. 27
Annex A (informative) Measurement uncertainty of the power spectral density test
level . 29
A.1 General . 29
A.2 Uncertainty budgets for test methods . 29
A.2.1 General symbols . 29
A.2.2 Definition of the measurand . 29
A.2.3 MU contributors of the measurand . 29
A.2.4 Input quantities and calculation examples for expanded uncertainty . 30
A.3 Expression of the calculated measurement uncertainty and its application . 31
Annex B (informative) Rationale for the selection of the preferred broadband source –
Information on test signal generation . 33
B.1 General . 33
B.2 Principles of band-limited broadband signal generation . 33
B.2.1 General . 33
B.2.2 (True) random noise generation. 33

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SIST EN 61000-4-31:2017
IEC 61000-4-31:2016 © IEC 2016 – 3 –
B.2.3 Pseudo-random noise sequence . 34
B.2.4 Impulse . 38
B.2.5 OFDM scheme . 40
B.3 Selection of the preferred broadband source . 42
Bibliography . 43

Figure 1 – Immunity test to broadband conducted disturbances . 11
Figure 2 – Example of voltage spectrum of a broadband test signal measured with a
120 kHz resolution bandwidth . 13
Figure 3 – Principle of the test generator . 14
Figure 4 – Example of simplified diagram for the circuit of CDND . 15
Figure 5 – Example of coupling and decoupling network for power ports other than AC
mains . 16
Figure 6 – Test set-up regarding test generator flatness and typical test signal . 18
Figure 7 – Typical circuit diagram of the transformer jig showing 50 Ω side and 100 Ω
side of the transformer and 2 pcs 0,1 µF coupling capacitors . 18
Figure 8 – Transformer jig specifications . 20
Figure 9 – Example of the set-up geometry to verify the insertion loss of the injection
coupling system . 20
Figure 10 – Set-up for the evaluation of the total insertion loss of the injection
coupling system . 21
Figure 11 – Set-up for level setting . 22
Figure 12 – Example of test set-up for an EUT comprised of a single unit (top view) . 23
Figure 13 – Example of a test set-up for an EUT comprised of several units (top view) . 24
Figure 14 – Immunity test to a 2-port EUT (when only CDNDs can be used) . 26
Figure A.1 – Example of influences upon the power spectral density test level using a
CDND . 30
Figure B.1 – White noise source . 34
Figure B.2 – Principle of band-limited broadband signal generation with an arbitrary
waveform generator . 35
Figure B.3 – Signal spectrum of a band-limited pseudo-random noise signal (measured
with a 120 kHz resolution bandwidth) . 36
Figure B.4 – Extract of the band-limited pseudo noise signal in time domain (measured
with an oscilloscope) . 37
Figure B.5 – Signal spectrum of the band-limited pseudo noise signal without an anti-
alias filter . 37
Figure B.6 – Extract of the signal spectrum of a band-limited pseudo noise signal
(measured with a 200 Hz resolution bandwidth) . 38
Figure B.7 – Signal spectrum of a band-limited impulse signal (measured with a
120 kHz resolution bandwidth) . 39
Figure B.8 – Extract of the band-limited impulse signal in time domain (measured with
an oscilloscope) . 39
Figure B.9 – Extract of the signal spectrum of a band-limited impulse signal
(measured with a 200 Hz resolution bandwidth) . 40
Figure B.10 – Signal spectrum of an OFDM signal (measured with a 120 kHz
resolution bandwidth) . 41
Figure B.11 – Extract of the signal spectrum of an OFDM signal (measured with a
200 Hz resolution bandwidth) . 41

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SIST EN 61000-4-31:2017
– 4 – IEC 61000-4-31:2016 © IEC 2016
Figure B.12 – Signal spectrum of an OFDM signal with an amplitude step at 30 MHz
(measured with a 120 kHz resolution bandwidth) . 42

Table 1 – Test levels . 12
Table 2 – Characteristics of the test generator . 14
Table 3 – Specification of the main parameters of the CDND for current ≤ 16 A . 15
Table 4 – Usage of CDNs. 16
Table A.1 – CDND level setting process . 31
Table B.1 – Comparison of white noise signal generation methods . 42

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SIST EN 61000-4-31:2017
IEC 61000-4-31:2016 © IEC 2016 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

ELECTROMAGNETIC COMPATIBILITY (EMC) –

Part 4-31: Testing and measurement techniques –
AC mains ports broadband conducted disturbance immunity test

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 61000-4-31 has been prepared by subcommittee 77B: High-
frequency phenomena, of IEC technical committee 77: Electromagnetic compatibility.
This standard forms Part 4-31 of the IEC 61000 series. It has the status of a basic EMC
publication in accordance with IEC Guide 107.
The text of this standard is based on the following documents:
FDIS Report on voting
77B/758/FDIS 77B/760/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.

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SIST EN 61000-4-31:2017
– 6 – IEC 61000-4-31:2016 © IEC 2016
A list of all parts in the IEC 61000 series, published under the general title Electromagnetic
compatibility (EMC), 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 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.

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.

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SIST EN 61000-4-31:2017
IEC 61000-4-31:2016 © IEC 2016 – 7 –
INTRODUCTION
IEC 61000 is published in separate parts according to the following structure:
Part 1: General
General considerations (introduction, fundamental principles)
Definitions, terminology
Part 2: Environment
Description of the environment
Classification of the environment
Compatibility levels
Part 3: Limits
Emission limits
Immunity limits (in so far as they do not fall under the responsibility of the product
committees)
Part 4: Testing and measurement techniques
Measurement techniques
Testing techniques
Part 5: Installation and mitigation guidelines
Installation guidelines
Mitigation methods and devices
Part 6: Generic standards
Part 9: Miscellaneous
Each part is further subdivided into several parts, published either as International Standards
or as Technical Specifications or Technical Reports, some of which have already been
published as sections. Others will be published with the part number followed by a dash and a
second number identifying the subdivision (example: IEC 61000-6-1).
This part is an International Standard which gives immunity requirements and test procedure
related to conducted broadband disturbances.

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SIST EN 61000-4-31:2017
– 8 – IEC 61000-4-31:2016 © IEC 2016
ELECTROMAGNETIC COMPATIBILITY (EMC) –

Part 4-31: Testing and measurement techniques –
AC mains ports broadband conducted disturbance immunity test



1 Scope and object
This part of IEC 61000 relates to the conducted immunity of electrical and electronic
equipment to electromagnetic disturbances coming from intended and/or unintended
broadband signal sources in the frequency range 150 kHz up to 80 MHz.
The object of this standard is to establish a common reference to evaluate the immunity of
electrical and electronic equipment when subjected to conducted disturbances caused by
intended and/or unintended broadband signal sources on AC mains ports. The test method
documented in this standard describes a consistent method to assess the immunity of an
equipment or system against a defined phenomenon.
Equipment not having at least one AC mains port is excluded. The power ports not intended
to be connected to AC mains distribution networks are not considered as “AC mains ports”
and therefore are excluded.
This standard is applicable only to single phase equipment having rated input current ≤ 16 A;
the application of the broadband disturbance to multiple phase equipment and/or equipment
with rated input current > 16 A is under consideration.
NOTE As described in IEC Guide 107, this standard is a basic EMC publication for use by product committees of
the IEC. As also stated in Guide 107, the IEC product committees are responsible for determining whether this
immunity test standard is to be applied or not, and if applied, they are responsible for determining the appropriate
test levels and performance criteria. TC 77 and its sub-committees are prepared to co-operate with product
committees in the evaluation of the value of particular immunity tests for their products.
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 60050-161, International Electrotechnical Vocabulary (IEV) – Part 161: Electromagnetic
compatibility (available at www.electropedia.org)
IEC 61000-4-6:2013, Electromagnetic compatibility (EMC) – Part 4-6: Testing and
measurement techniques – Immunity to conducted disturbances, induced by radio-frequency
fields
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-161 as well
as the following apply.
3.1
artificial hand
electrical network simulating the impedance of the human body under average operational
conditions between a hand-held electrical appliance and earth

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SIST EN 61000-4-31:2017
IEC 61000-4-31:2016 © IEC 2016 – 9 –
Note 1 to entry: The construction should be in accordance with CISPR 16-1-2.
[SOURCE: IEC 60050-161:1990, 161-04-27, modified – A note to entry has been added.]
3.2
auxiliary equipment
AE
equipment necessary to provide the equipment under test (EUT) with the signals required for
normal operation and equipment to verify the performance of the EUT
3.3
common mode impedance
asymmetrical mode impedance between a cable attached to a port and the reference ground
plane (RGP)
Note 1 to entry: This note applies to the French language only.
3.4
coupling network
electrical circuit for transferring energy from one circuit to another with a defined impedance
Note 1 to entry: Coupling and decoupling devices can be integrated into one box (coupling/decoupling network
(CDN)) or they can be in separate networks.
3.5
coupling/decoupling network
CDN
electrical circuit incorporating the functions of both the coupling and decoupling networks
3.6
coupling/decoupling network for differential mode coupling
CDND
electrical circuit incorporating the functions of both the coupling and decoupling networks that
injects the signal primarily in differential mode
3.7
decoupling network
decoupling device
electrical circuit for preventing test signals applied to the EUT from affecting other devices,
equipment or systems that are not under test
3.8
differential mode impedance
symmetrical mode impedance between L and N of an AC mains port
3.9
longitudinal conversion loss
LCL
measure, in a one- or two-port network, of the degree of unwanted transverse (symmetric
mode) signal produced at the terminals of the network due to the presence of a longitudinal
(asymmetric mode) signal on the connecting leads
Note 1 to entry: LCL is a ratio expressed in dB.
[SOURCE: ITU-T O.9:1999, 4.1, modified – The definition has been rephrased and the
parentheses have been added.]

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