IEC 61726:2015
(Main)Cable assemblies, cables, connectors and passive microwave components - Screening attenuation measurement by the reverberation chamber method
Cable assemblies, cables, connectors and passive microwave components - Screening attenuation measurement by the reverberation chamber method
IEC 61726:2015 describes the measurement of screening attenuation by the reverberation chamber test method, sometimes named mode stirred chamber, suitable for virtually any type of microwave component and having no theoretical upper frequency limit. It is only limited toward low frequencies due to the size of the test equipment, which is frequency-dependent and is only one of several methods of measuring screening attenuation. For the purpose of this standard, examples of microwave components are waveguides, phase shifters, diplexers/multiplexers, power dividers/combiners etc. This third edition cancels and replaces the second edition, published in 1999. This edition constitutes a technical revision. It takes into account the latest developments in the design of reverberation chambers as described in IEC 61000-4-21, which is also referencing this standard as a possible test method. Furthermore, an alternative measurement procedure is added which is able to reduce the measurement time needed.
Câbles, cordons, connecteurs et composants hyperfréquence passifs - Mesure de l'affaiblissement d'écran par la méthode de la chambre réverbérante
L'IEC 61726:2015 décrit la mesure de l'affaiblissement d'écran par la méthode d'essai de la chambre réverbérante, parfois appelée «chambre à brassage de modes». Elle convient pour pratiquement n'importe quel type de composants hyperfréquence et n'a, en théorie, pas de limite supérieure de fréquence. Elle est simplement limitée vers les fréquences basses en raison de la taille de l'équipement d'essai qui dépend de la fréquence. Elle ne constitue qu'une des méthodes de mesure de l'affaiblissement d'écran.
Pour les besoins de la présente norme, des exemples de composants hyperfréquence sont les guides d'ondes, les déphaseurs, les diplexeurs/multiplexeurs, les répartiteurs/combineurs de puissance, etc.
Cette troisième édition annule et remplace la seconde édition, publiée en 1999. La présente édition constitue une révision technique.
Elle tient compte des dernières évolutions dans la conception des chambres réverbérantes, décrites dans l'IEC 61000-4-21, qui fait également référence à la présente norme en tant que méthode d'essai possible. De plus, une procédure de mesure alternative est ajoutée, permettant de réduire le temps de mesure nécessaire.
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IEC 61726 ®
Edition 3.0 2015-09
INTERNATIONAL
STANDARD
Cable assemblies, cables, connectors and passive microwave components –
Screening attenuation measurement by the reverberation chamber 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
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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.
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77, 86 and CISPR.
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IEC 61726 ®
Edition 3.0 2015-09
INTERNATIONAL
STANDARD
Cable assemblies, cables, connectors and passive microwave components –
Screening attenuation measurement by the reverberation chamber method
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.120.10; 33.120.30 ISBN 978-2-8322-2893-7
– 2 – IEC 61726:2015 © IEC 2015
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions. 5
4 Basic description of the reverberation chamber method . 5
5 Measurement of the screening attenuation of the device under test (DUT) . 6
6 Description of the test set-up . 6
6.1 Reverberation chamber . 6
6.2 Mode stirrer . 7
6.3 Antennas. 7
6.4 Test equipment . 7
6.5 Device under test (DUT) . 7
6.6 Linking devices . 8
7 Measurement procedure . 8
7.1 General . 8
7.2 Measurement of the DUT . 9
7.2.1 General . 9
7.2.2 Standard measurement . 9
7.2.3 Fast measurement . 9
7.3 Measurement of the insertion loss of the cavity . 10
7.4 Control of the test set-up . 10
7.4.1 Dynamic range . 10
7.4.2 Insertion loss of the chamber . 11
7.4.3 Measurement of a calibrator . 11
7.4.4 Measurement of lossy DUT . 11
7.5 Revolution speed of the mode stirrer . 11
7.6 Test frequencies . 11
7.7 Voltage standing wave ratio (VSWR) . 12
8 Evaluation of the test results . 12
Annex A (informative) Relationship between transfer impedance and screening
attenuation . 13
Annex B (informative) Example of a calibrator . 14
Bibliography . 16
Figure 1 – Example of a test set-up . 7
Figure B.1 – Basic construction details . 14
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CABLE ASSEMBLIES, CABLES, CONNECTORS AND PASSIVE
MICROWAVE COMPONENTS –
SCREENING ATTENUATION MEASUREMENT BY THE
REVERBERATION CHAMBER 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 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 61726 has been prepared by IEC technical committee 46: Cables,
wires, waveguides, R.F. connectors, R.F. and microwave passive components and
accessories.
This third edition cancels and replaces the second edition, published in 1999. This edition
constitutes a technical revision.
It takes into account the latest developments in the design of reverberation chambers as
described in IEC 61000-4-21, which is also referencing this standard as a possible test method.
Furthermore, an alternative measurement procedure is added which is able to reduce the
measurement time needed.
– 4 – IEC 61726:2015 © IEC 2015
The text of this standard is based on the following documents:
FDIS Report on voting
46/551/FDIS 46/569/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.
The committee has decided that the contents of this 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.
A bilingual version of this publication may be issued at a later date.
CABLE ASSEMBLIES, CABLES, CONNECTORS AND PASSIVE
MICROWAVE COMPONENTS –
SCREENING ATTENUATION MEASUREMENT BY THE
REVERBERATION CHAMBER METHOD
1 Scope
The requirements of modern electronic equipment have indicated a demand for a method for
testing screening attenuation of microwave components over their whole frequency range.
Convenient test methods exist for low frequencies and components of regular shape. These
test methods are described in the relevant IEC product specifications (e.g.
IEC 62153-4-3). For higher frequencies and for components of irregular shape, a new test
method has become necessary and such a test method is described in this International
Standard.
This International Standard describes the measurement of screening attenuation by the
reverberation chamber test method, sometimes named mode stirred chamber, suitable for
virtually any type of microwave component and having no theoretical upper frequency limit. It is
only limited toward low frequencies due to the size of the test equipment, which is frequency-
dependent and is only one of several methods of measuring screening attenuation.
For the purpose of this standard, examples of microwave components are waveguides, phase
shifters, diplexers/multiplexers, power dividers/combiners etc.
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 61196-1, Coaxial communication cables – Part 1: Generic specification –
...
IEC 61726 ®
Edition 3.0 2015-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Cable assemblies, cables, connectors and passive microwave components –
Screening attenuation measurement by the reverberation chamber method
Câbles, cordons, connecteurs et composants hyperfréquence passifs – Mesure
de l'affaiblissement d'écran par la méthode de la chambre réverbérante
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.
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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 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 16 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. 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 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
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IEC 61726 ®
Edition 3.0 2015-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Cable assemblies, cables, connectors and passive microwave components –
Screening attenuation measurement by the reverberation chamber method
Câbles, cordons, connecteurs et composants hyperfréquence passifs – Mesure
de l'affaiblissement d'écran par la méthode de la chambre réverbérante
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.120.10; 33.120.30 ISBN 978-2-8322-4922-2
– 2 – IEC 61726:2015 © IEC 2015
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions. 5
4 Basic description of the reverberation chamber method . 5
5 Measurement of the screening attenuation of the device under test (DUT) . 6
6 Description of the test set-up . 6
6.1 Reverberation chamber . 6
6.2 Mode stirrer . 7
6.3 Antennas. 7
6.4 Test equipment . 7
6.5 Device under test (DUT) . 7
6.6 Linking devices . 8
7 Measurement procedure . 8
7.1 General . 8
7.2 Measurement of the DUT . 9
7.2.1 General . 9
7.2.2 Standard measurement . 9
7.2.3 Fast measurement . 9
7.3 Measurement of the insertion loss of the cavity . 10
7.4 Control of the test set-up . 10
7.4.1 Dynamic range . 10
7.4.2 Insertion loss of the chamber . 11
7.4.3 Measurement of a calibrator . 11
7.4.4 Measurement of lossy DUT . 11
7.5 Revolution speed of the mode stirrer . 11
7.6 Test frequencies . 11
7.7 Voltage standing wave ratio (VSWR) . 12
8 Evaluation of the test results . 12
Annex A (informative) Relationship between transfer impedance and screening
attenuation . 13
Annex B (informative) Example of a calibrator . 14
Bibliography . 16
Figure 1 – Example of a test set-up . 7
Figure B.1 – Basic construction details . 14
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CABLE ASSEMBLIES, CABLES, CONNECTORS AND PASSIVE
MICROWAVE COMPONENTS –
SCREENING ATTENUATION MEASUREMENT BY THE
REVERBERATION CHAMBER 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 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 61726 has been prepared by IEC technical committee 46: Cables,
wires, waveguides, R.F. connectors, R.F. and microwave passive components and
accessories.
This bilingual version (2017-10) corresponds t
...
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