1、BSI Standards PublicationCable assemblies, cables, connectors and passive microwave components Screeningattentuation measurement by the reverberation chamber methodBS EN 61726:2015National forewordThis British Standard is the UK implementation of EN 61726:2015. It is identical to IEC 61726:2015. It
2、supersedes BS EN 61726:2000 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee EPL/46, Cables, wires and waveguides, radio frequency connectors and accessories for communication and signalling.A list of organizations represented on this committee can be ob
3、tained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 77406 5ICS 33.120.10; 33.120.30Com
4、pliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 November 2015.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 61726:2015EUROP
5、EAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61726 November 2015 ICS 33.120.10; 33.120.30 Supersedes EN 61726:2000 English Version Cable assemblies, cables, connectors and passive microwave components - Screening attenuation measurement by the reverberation chamber method (IEC 61726:2015) Cbles,
6、cordons, connecteurs et composants hyperfrquence passifs - Mesure de laffaiblissement dcran par la mthode de la chambre rverbrante (IEC 61726:2015) Konfektionierte Kabel, Kabel, Steckverbinder und passive Mikrowellenbauteile - Messung der Schirmdmpfung mit dem Strahlungskammerverfahren (IEC 61726:20
7、15) This European Standard was approved by CENELEC on 2015-10-13. 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 bibliographi
8、cal 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 responsibi
9、lity 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, F
10、ormer Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotech
11、nical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No
12、. EN 61726:2015 E BS EN 61726:2015EN 61726:2015 2 European foreword The text of document 46/551/FDIS, future edition 3 of IEC 61726, prepared by IEC/TC 46 “Cables, wires, waveguides, R.F. connectors, R.F. and microwave passive components and accessories“ was submitted to the IEC-CENELEC parallel vot
13、e and approved by CENELEC as EN 61726:2015. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2016-07-13 latest date by which the national standards conflicting with the do
14、cument have to be withdrawn (dow) 2018-10-13 This document supersedes EN 61726:2000. 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. E
15、ndorsement notice The text of the International Standard IEC 61726:2015 was approved by CENELEC as a European Standard without any modification. BS EN 61726:2015EN 61726:2015 3 Annex ZA (normative) Normative references to international publications with their corresponding European publications The
16、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
17、 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 TS 621
18、53-4-1 - Metallic communication cable test methods - Part 4-1: Electromagnetic compatibility (EMC) - Introduction to electromagnetic screening measurements - - IEC 61000-4-21 - Electromagnetic compatibility (EMC) - Part 4-21: Testing and measurement techniques - Reverberation chamber test methods EN
19、 61000-4-21 - IEC 61196-1 - Coaxial communication cables - Part 1: Generic specification - General, definitions and requirements - - BS EN 61726:2015 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 reverberati
20、on 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
21、 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
22、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
23、 (informative) Example of a calibrator 14 Bibliography 16 Figure 1 Example of a test set-up . 7 Figure B.1 Basic construction details 14 BS EN 61726:2015IEC 61726:2015 IEC 2015 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ CABLE ASSEMBLIES, CABLES, CONNECTORS AND PASSIVE MICROWAVE COMPONENTS SCREENI
24、NG 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
25、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 referre
26、d 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 th
27、is 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 internation
28、al 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 e
29、fforts 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 Public
30、ations 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. I
31、ndependent 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)
32、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 cost
33、s (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 applica
34、tion 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 technic
35、al 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 desig
36、n 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. BS EN 61726:2015 4 IEC 61726:2015 IEC 2015 The text of this s
37、tandard 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, P
38、art 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
39、 a revised edition, or amended. A bilingual version of this publication may be issued at a later date. BS EN 61726:2015IEC 61726:2015 IEC 2015 5 CABLE ASSEMBLIES, CABLES, CONNECTORS AND PASSIVE MICROWAVE COMPONENTS SCREENING ATTENUATION MEASUREMENT BY THE REVERBERATION CHAMBER METHOD 1 Scope The req
40、uirements 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 relevan
41、t 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 b
42、y 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
43、 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 normative
44、ly 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 specific
45、ation General, definitions and requirements IEC TS 62153-4-1, Metallic communication cable test methods Part 4-1: Electromagnetic compatibility (EMC) Introduction to electromagnetic screening measurements IEC 61000-4-21, Electromagnetic compatibility (EMC) Part 4-21: Testing and measurement techniqu
46、es Reverberation chamber test methods 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 61196-1 and IEC 61000-4-21 apply. 4 Basic description of the reverberation chamber method The reverberation chamber method for measurement of the screening attenuat
47、ion of microwave components consists of exposing the device under test (DUT) to an almost homogeneous and isotropic electromagnetic field and then measuring the signal level induced into the device. BS EN 61726:2015 6 IEC 61726:2015 IEC 2015 These conditions are achieved by the use of a shielded enc
48、losure, which acts as an oversized cavity (in terms of wavelength), with a high quality factor. Its boundary conditions are continuously agitated by a rotating reflective surface (mode stirrer), mounted within the chamber, which enables the field to approach homogeneous and isotropic conditions duri
49、ng one revolution. Electromagnetic power is fed to the chamber by means of an input or transmitting antenna. The strength of the field inside the chamber is measured through a reference antenna. The ratio of the injected power (input antenna) to the received power (reference antenna) is the insertion loss of the cavity. The insertion loss is strongly frequency dependent and is also dependent on the quality factor of the cavity. More detailed explanation on the measurement facility ca
