IEC 62153-4-12:2009

IEC 62153-4-12 ®
Edition 1.0 2009-08
INTERNATIONAL
STANDARD
colour
inside
Metallic communication cable test methods –
Part 4-12: Electromagnetic compatibility (EMC) – Coupling attenuation or
screening attenuation of connecting hardware – Absorbing clamp method

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.

IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: inmail@iec.ch
Web: 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.
ƒ Catalogue of IEC publications: www.iec.ch/searchpub
The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,…).
It also gives information on projects, withdrawn and replaced publications.
ƒ IEC Just Published: www.iec.ch/online_news/justpub
Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available
on-line and also by email.
ƒ Electropedia: www.electropedia.org
The world's leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions
in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical
Vocabulary online.
ƒ Customer Service Centre: www.iec.ch/webstore/custserv
If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service
Centre FAQ or contact us:
Email: csc@iec.ch
Tel.: +41 22 919 02 11
Fax: +41 22 919 03 00
IEC 62153-4-12 ®
Edition 1.0 2009-08
INTERNATIONAL
STANDARD
colour
inside
Metallic communication cable test methods –
Part 4-12: Electromagnetic compatibility (EMC) – Coupling attenuation or
screening attenuation of connecting hardware – Absorbing clamp method

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
M
ICS 33.100; 33.120.20 ISBN 978-2-88910-639-4
– 2 – 62153-4-12 © IEC:2009(E)
CONTENTS
FOREWORD.3

1 Scope.5
2 Normative references.5
3 Terms and definitions .5
4 Test method .5
4.1 Equipment .5
4.1.1 General .5
4.1.2 Balun requirements.6
4.1.3 Test head and extension cable requirements.7
4.1.4 Impedance matching.8
4.2 Test sample.8
4.2.1 Length of the extension cables.8
4.2.2 Tested length.8
4.2.3 Preparation of extension cable and test head .8
4.2.4 Balanced connecting hardware.8
4.3 Calibration procedure .9
4.4 Test set-up .9
4.4.1 General .9
4.4.2 Test set-up verification.10
4.5 Measuring procedure .11
5 Expression of test results.11
6 Test report.11
6.1 General .11
6.2 Evaluation of test results.11

Figure 1 – Measurement of surface wave at near end of connecting hardware .6
Figure 2 – Termination of extension cables.9
Figure 3 – Test set-up for a near end measurement of connecting hardware.10
Figure 4 – Test set-up for a near end measurement of connecting hardware.10
Figure 5 – Typical measurement of screened connecting hardware.12
Figure 6 – Typical measurement of an unscreened balanced connecting hardware .13
Figure 7 – Typical measurement of a screened balanced connecting hardware .13

Table 1 – Balun performance characteristics (30 MHz to 1 GHz).7

62153-4-12 © IEC:2009(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
METALLIC COMMUNICATION CABLE TEST METHODS –

Part 4-12: Electromagnetic compatibility (EMC) –
Coupling attenuation or screening attenuation
of connecting hardware – Absorbing clamp method

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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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 62153-4-12 has been prepared by IEC technical committee 46:
Cables, wires, waveguides, R.F. connectors, R.F. and microwave passive components and
accessories.
The text of this standard is based on the following documents:
CDV Report on voting
46/312/CDV 46/328/RVC
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 is to be read in conjunction with IEC 62153-4-5 (2006).

– 4 – 62153-4-12 © IEC:2009(E)

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 62153 series, under the general title: Metallic communication cable
test methods, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until the
maintenance result 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.
A bilingual version may be issued at a later date.

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 publication using a colour printer.

62153-4-12 © IEC:2009(E) – 5 –
METALLIC COMMUNICATION CABLE TEST METHODS –

Part 4-12: Electromagnetic compatibility (EMC) –
Coupling attenuation or screening attenuation
of connecting hardware – Absorbing clamp method

1 Scope
This part of IEC 62153 details the method of test to determine the coupling attenuation or
screening attenuation for connecting hardware used in analogue and digital communication
systems. The test method details means to test one part of a connecting hardware (e. g. wall
outlet or plug alone) as well as testing a mated pair of connecting hardware.
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 60050-726, International Electrotechnical Vocabulary – Chapter 726: Transmission lines
and waveguides
IEC 61196-1, Coaxial communication cables – Part 1: Generic specification – General,
definitions and requirements
IEC 62153-4-5:2006, Metallic communication cables test methods – Part 4-5: Electromagnetic
compatibility (EMC) – Coupling or screening attenuation – Absorbing clamp method
ITU-T Recommendation G.117:1996, Transmission aspects of unbalance about earth
ITU-T Recommendation O.9:1999, Measuring arrangements to assess the degree of unbalance
about earth
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-726 and
IEC 61196-1 apply.
In this document, connecting hardware is defined as a complete connecting device including
compensating or matching networks (if any), connectors and cable terminations.
4 Test method
4.1 Equipment
4.1.1 General
See 5.1.1 of IEC 62153-4-5, and Figure 1 below.

– 6 – 62153-4-12 © IEC:2009(E)
The connecting hardware under test shall be terminated using the termination method and a
cable type for which it is constructed. If only one part of the connecting hardware is under test,
a test head shall be used to mate the part under test.
600 cm ± 10 cm
300 cm ± 5 cm 300 cm ± 5 cm
IEC  1342/09
Key
0 signal generator, output impedance Z
1 connecting hardware under test,
8 absorber (ferrite tube) of the clamp,
nominal characteristic impedance Z
operational attenuation > 10 dB
2 outer circuit of connecting hardware
9 absorber (or second clamp), operational
attenuation > 10 dB
under test, impedance Z2
10 termination of the far end extension cable
3 absorbing clamp, impedance Z
terminating the connecting hardware
4 measuring receiver
11 shield of signal generator and balun if needed
5 balun (if applicable)
for high dynamic range
6 current transformer of the clamp
12 reflector plate
7 measuring receiver cable (use the same
13 extension cable terminating the connecting
h
...