1、BRITISH STANDARD AEROSPACE SERIES BS EN 3475-808:2002 Cables, electrical, aircraft use Test methods Part 808: Cross-talk The European Standard EN 3475-808:2002 has the status of a British Standard ICS 49.060 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 3475-808:2002 Th
2、is British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 25 June 2002 BSI 25 June 2002 ISBN 0 580 39895 1 National foreword This British Standard is the o
3、fficial English language version of EN 3475-808:2002. The UK participation in its preparation was entrusted by Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology, to Subcommittee, ACE/6/2, Aerospace Cables, which has the responsibility to: A list of organizations repr
4、esented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Corresp
5、ondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not
6、of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulga
7、te them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 4, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication
8、 Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN3475808 June2002 ICS49.060 Englishversion AerospaceseriesCables,electrical,aircraftuseTest methodsPart808:Crosstalk SriearospatialeCbleslectriquesusage aronautiqueMthodesdessaisPartie808:Diaphonie LuftundRaumfahrtElektrischenLei
9、tungenfrLuftfahrt VerwendungPrfverfahrenTeil808:Nebensprechen ThisEuropeanStandardwasapprovedbyCENon1March2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbi
10、bliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifi
11、edtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEE
12、FORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN3475808:2002EEN3475808:2002(E) 2 Foreword Thisdocument(EN3475808:2002)hasbe
13、enpreparedbytheEuropeanAssociationofAerospace Manufacturers(AECMA). AfterenquiriesandvotescarriedoutinaccordancewiththerulesofthisAssociation,thisStandardhas receivedtheapprovaloftheNationalAssociationsandtheOfficialServicesofthemembercountriesof AECMA,priortoitspresentationtoCEN. ThisEuropeanStanda
14、rdshallbegiventhestatusofanationalstandard,eitherbypublicationofanidentical textorbyendorsement,atthelatestbyDecember2002,andconflictingnationalstandardsshallbe withdrawnatthelatestbyDecember2002. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesa
15、reboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark, Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway, Portugal,Spain,Sweden,SwitzerlandandtheUnitedKingdom.EN3475808:2002(E) 3 1 Scope Thisstandardspecifiesmethodsformeasuringthecrosstalk
16、ofacable(multicorecables). ItshallbeusedtogetherwithEN3475100. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreferenceprovisionsfromotherpublications. Thesenormativereferencesarecitedattheappropriateplacesinthetextandthepublicationsarelisted hereafter.Fordatedreferences,subse
17、quentamendmentstoorrevisionsofanyofthesepublicationsapplyto thisEuropeanStandardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthe latesteditionofthepublicationreferredtoapplies. EN3475100 AerospaceseriesCables,electrical,aircraftuseTestmethodsPart100:General 3 Preparationofspecim
18、ens Theseshallbestripped,preparedandconnectedtothemeasuringdevices. 4 Methods Unlessotherwiseindicatedintheproductstandard,themeasurementshallbetakenona10mcablesection, connectedasshowninfigures1and2. Figure1CrosstalkmeasurementMeasurementinasymmetricmode 2EN3475808:2002(E) 4 Figure2Crosstalkmeasure
19、mentMeasurementinsymmetricmode Eachpairshallbeconnectedateachendtoaresistorequivalenttothespecifiedcharacteristicimpedance Z o ofthepair. Connectionsshallbeasshortaspossiblesoastominimizetheinteractionoftheends. TheemittivepairissuppliedbyageneratorGatafrequencyofwhichtheoutputimpedanceisascloseas p
20、ossibletothecharacteristicimpedance Z o ofthepairs. Measure,usinghighinputimpedancevoltmeter(e.g.oscilloscope): thevoltageattheinputoftheemittivepair U 1 ; thevoltageatthegeneratorsideofapairnexttotheemittivepair(nearendcrosstalk) U 2 ; thevoltageattheendremotefromthegeneratorofapairnexttotheemittiv
21、epair(farendcrosstalk) U 3 . Nearendcrosstalkattenuationisequalto 20 2 1 lg U U ,indecibels Farendcrosstalkattenuationisequalto 20 1 lg 3 U U ,indecibels 5 Requirement Thenearendandfarendcrosstalkattenuationvaluesshallbeabovethevaluesspecifiedintheproduct standard,inthebandindicated. 2BS EN 3475-808
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