1、BRITISH STANDARD AEROSPACE SERIES BS EN 3475-807:2002 Cables, electrical, aircraft use Test methods Part 807: Transfer impedance The European Standard EN 3475-807:2002 has the status of a British Standard ICS 49.060 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 3475-807
2、:2002 This 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 39896 X National foreword This British Standard
3、is the official English language version of EN 3475-807:2002. 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 organizati
4、ons represented 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
5、 Correspondence 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 d
6、oes not 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
7、promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 5 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date
8、 CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN3475807 June2002 ICS49.060 Englishversion AerospaceseriesCables,electrical,aircraftuseTest methodsPart807:Transferimpedance SriearospatialeCbleslectriquesusage aronautiqueMthodesdessaisPartie807:Impdance detransfert LuftundRaumfahrtElektrisch
9、enLeitungenfrLuftfahrt VerwendungPrfverfahrenTeil807: Kupplungswiderstand ThisEuropeanStandardwasapprovedbyCENon1March2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptoda
10、telistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlangu
11、ageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROP
12、EANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN3475807:2002EEN3475807:2002(E) 2 Foreword Thisdocument(EN347580
13、7:2002)hasbeenpreparedbytheEuropeanAssociationofAerospace Manufacturers(AECMA). AfterenquiriesandvotescarriedoutinaccordancewiththerulesofthisAssociation,thisStandardhas receivedtheapprovaloftheNationalAssociationsandtheOfficialServicesofthemembercountriesof AECMA,priortoitspresentationtoCEN. ThisEu
14、ropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidentical textorbyendorsement,atthelatestbyDecember2002,andconflictingnationalstandardsshallbe withdrawnatthelatestbyDecember2002. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowin
15、g countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark, Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway, Portugal,Spain,Sweden,SwitzerlandandtheUnitedKingdom.EN3475807:2002(E) 3 1 Scope Thisstandardspecifiesmethodsformeasuring
16、thetransferimpedanceofacable. ItshallbeusedtogetherwithEN3475100. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreferenceprovisionsfromotherpublications. Thesenormativereferencesarecitedattheappropriateplacesinthetextandthepublicationsarelisted hereafter.Fordatedreferences,su
17、bsequentamendmentstoorrevisionsofanyofthesepublicationsapplyto thisEuropeanStandardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthe latesteditionofthepublicationreferredtoapplies. EN3475100 AerospaceseriesCables,electrical,aircraftuseTestmethodsPart100:General 3 Preparationofspe
18、cimens Theseshallbestrippedandpreparedforconnectiontothemeasuringdevicerequiredforthemethod chosen. 4 Methods 4.1 MethodA:cableleakagemethod Simplemethodvalidupto10 5 W /mand10MHz Placethelen gthoftestcable (approximately1m)inasealedcopper boxwithtwoleadthrou ghsasshownin figure1(dimensions500mm 660
19、mm). Theleadthrou ghsforthe generatorand microvoltmeterdetectorareasshownin figure2. Sothat: V g = thegeneratorvoltageafterthe attenuator(inputtocable) V = voltagedetected Z o = valueinohmsofcharacteristic impedanceincommonmode L = lengthofcableinmetres;therefore: Z V.Z V.L T o g = Figure1EN3475807:
20、2002(E) 4 Formulticorecables,thetwoconductorsshallbe connectedtoeachotheratbothends. Formultiscreenedcables,theseshallbeconnected toeachotheratbothends. Figure2 Thetestcableshallbeconnectedviaitscharacteristicimpedance Z o . Selectageneratorwiththeclosestpossibleimpedanceto Z o . 4.2 MethodB:methodo
21、fsusceptiblecable Validuptof= ,where: f isthefrequency,inmegahertz L isthecablelength,inmetres Theconductorsinsidethescreening,thetransferimpedanceofwhichisspecifiedintheproductstandard, shallbeconnectedtogetheratbothends(figure3). Figure3 G isavariablefrequencypowergenerator. V isaselectivevoltmete
22、r(fieldintensitymeter)withinputimpedance Z 1 . Thevalueof I ext. isobtainedeitherbydirectmeasurementusingaclamponcurrenttesterorbymeasuring U 1 ,bytheformula: I ext. = U 1 R R isapowerlimitingresistor U 1 isthegeneratoroutputvoltage 30 LEN3475807:2002(E) 5 Theshortcircuitedelementsareconsideredinthe
23、samewayastheconductorofacoaxialcable.See figure4. Thelengthofthecableinsidethecoppertubeis L. Thetransferimpedanceofthecablescreening Z T isdefinedbythefollowingtheoreticalformula: Z. T = 1 int. ext . L V I Figure4 inwhich V int. istheinterferencevoltageappearingbetweentheconductorandthescreening. 5
24、 Requirement Thetransferimpedancevalues Z T shallbebelowthevaluesspecifiedintheproductstandard.BS EN 3475-807:2002 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on s
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