IEC_61917__1988.pdf

TECHNICALREPORTIEC61917First edition1998-06Cables,cable assemblies and connectors Introduction to electromagnetic(EMC)screening measurementsCbles,cordons et connecteurs Introduction aux mesures de blindage lectromagntiqueReference numberIEC 61917:1998(E)Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-NumberingAs from 1 January 1997 all IEC publications are issued with a designation in the60000 series.Consolidated publicationsConsolidated versions of some IEC publications including amendments areavailable.For example,edition numbers 1.0,1.1 and 1.2 refer,respectively,to thebase publication,the base publication incorporating amendment 1 and the basepublication incorporating amendments 1 and 2.Validity of this publicationThe technical content of IEC publications is kept under constant review by the IEC,thus ensuring that the content reflects current technology.Information relating to the date of the reconfirmation of the publication is availablein the IEC catalogue.Information on the subjects under consideration and work in progress undertaken bythe technical committee which has prepared this publication,as well as the list ofpublications issued,is to be found at the following IEC sources:IEC web site*Catalogue of IEC publicationsPublished yearly with regular updates(On-line catalogue)*IEC BulletinAvailable both at the IEC web site*and as a printed periodicalTerminology,graphical and letter symbolsFor general terminology,readers are referred to IEC 60050:InternationalElectrotechnical Vocabulary(IEV).For graphical symbols,and letter symbols and signs approved by the IEC forgeneral use,readers are referred to publications IEC 60027:Letter symbols to beused in electrical technology,IEC 60417:Graphical symbols for use on equipment.Index,survey and compilation of the single sheets and IEC 60617:Graphical symbolsfor diagrams.*See web site address on title page.Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-TECHNICALREPORT TYPE 3IEC61917First edition1998-06Cables,cable assemblies and connectors Introduction to electromagnetic(EMC)screening measurementsCbles,cordons et connecteurs Introduction aux mesures de blindage lectromagntique Commission Electrotechnique Internationale International Electrotechnical CommissionPRICE CODE IEC 1998 Copyright-all rights reservedNo part of this publication may be reproduced or utilized in any form or by any means,electronic ormechanical,including photocopying and microfilm,without permission in writing from the publisher.International Electrotechnical Commission3,rue de Varemb Geneva,SwitzerlandTelefax:+41 22 919 0300e-mail:inmailiec.ch IEC web site http:/www.iec.chNFor price,see current catalogueCopyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-2 61917 IEC:1998(E)CONTENTSPageFOREWORD.3Clause1 Scope and object.52 Reference documents.53 Electromagnetic phenomena.54 The intrinsic screening parameters of short cables.74.1 Surface transfer impedance,ZT.74.2 Capacitive coupling admittance,Yc.74.3 Injecting with arbitrary cross-sections.94.4 Reciprocity and symmetry.94.5 Arbitrary load conditions.95Long cables coupled transmission lines.96Transfer impedance of a braided-wire outer conductor or screen.167Test possibilities.217.1 Measuring the transfer impedance of coaxial cables.217.2 Measuring the transfer impedance of cable assemblies.227.3 Measuring the transfer impedance of connectors.22Annex A List of symbols.25Annex B Bibliography.27Annex C Additional reading.29Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-61917 IEC:1998(E)3 INTERNATIONAL ELECTROTECHNICAL COMMISSION_CABLES,CABLE ASSEMBLIES AND CONNECTORS INTRODUCTION TO ELECTROMAGNETIC(EMC)SCREENING MEASUREMENTSFOREWORD1)The IEC(International Electrotechnical Commission)is a worldwide organization for standardization comprisingall national electrotechnical committees(IEC National Committees).The object of the IEC is to promoteinternational co-operation on all questions concerning standardization in the electrical and electronic fields.Tothis end and in addition to other activities,the IEC publishes International Standards.Their preparation isentrusted to technical committees;any IEC National Committee interested in the subject dealt with mayparticipate in this preparatory work.International,governmental and non-governmental organizations liaisingwith the IEC also participate in this preparation.The IEC collaborates closely with the International Organizationfor Standardization(ISO)in accordance with conditions determined by agreement between the twoor