BS EN 3475-805-2002 Aerospace series - Cables electrical aircraft use - Test methods - Characteristic impedance《航空航天系列 飞行器用电缆 试验方法 特性阻抗》.pdf

上传人:eveningprove235 文档编号:550761 上传时间:2018-12-09 格式:PDF 页数:8 大小:126.21KB
下载 相关 举报
BS EN 3475-805-2002 Aerospace series - Cables electrical aircraft use - Test methods - Characteristic impedance《航空航天系列 飞行器用电缆 试验方法 特性阻抗》.pdf_第1页
第1页 / 共8页
BS EN 3475-805-2002 Aerospace series - Cables electrical aircraft use - Test methods - Characteristic impedance《航空航天系列 飞行器用电缆 试验方法 特性阻抗》.pdf_第2页
第2页 / 共8页
BS EN 3475-805-2002 Aerospace series - Cables electrical aircraft use - Test methods - Characteristic impedance《航空航天系列 飞行器用电缆 试验方法 特性阻抗》.pdf_第3页
第3页 / 共8页
BS EN 3475-805-2002 Aerospace series - Cables electrical aircraft use - Test methods - Characteristic impedance《航空航天系列 飞行器用电缆 试验方法 特性阻抗》.pdf_第4页
第4页 / 共8页
BS EN 3475-805-2002 Aerospace series - Cables electrical aircraft use - Test methods - Characteristic impedance《航空航天系列 飞行器用电缆 试验方法 特性阻抗》.pdf_第5页
第5页 / 共8页
亲,该文档总共8页,到这儿已超出免费预览范围,如果喜欢就下载吧!
资源描述

1、BRITISH STANDARD AEROSPACE SERIES BS EN 3475-805:2002 Cables, electrical, aircraft use Test methods Part 805: Characteristic impedance The European Standard EN 3475-805:2002 has the status of a British Standard ICS 49.060 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 34

2、75-805:2002 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 39909 5 National foreword This British Sta

3、ndard is the official English language version of EN 3475-805:2002. 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 orga

4、nizations 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 Sta

5、ndards 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 Stan

6、dard does 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 development

7、s and 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

8、. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN3475805 June2002 ICS49.060 Englishversion AerospaceseriesCables,electrical,aircraftuseTest methodsPart805:Characteristicimpedance SriearospatialeCbleslectriquesusage aronautiqueMthodesdessaisPartie805:Impdance caractristique LuftundRaum

9、fahrtElektrischenLeitungenfrLuftfahrt VerwendungPrfverfahrenTeil805:Wellenwiderstand ThisEuropeanStandardwasapprovedbyCENon20January2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalt

10、eration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberi

11、ntoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnited

12、Kingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN3475805:2002EEN3475805:2002(E) 2 Foreword Thisdoc

13、ument(EN3475805:2002)hasbeenpreparedbytheEuropeanAssociationofAerospace Manufacturers(AECMA). AfterenquiriesandvotescarriedoutinaccordancewiththerulesofthisAssociation,thisStandardhas receivedtheapprovaloftheNationalAssociationsandtheOfficialServicesofthemembercountriesof AECMA,priortoitspresentatio

14、ntoCEN. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidentical textorbyendorsement,atthelatestbyDecember2002,andconflictingnationalstandardsshallbe withdrawnatthelatestbyDecember2002. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganization

15、softhefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark, Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway, Portugal,Spain,Sweden,SwitzerlandandtheUnitedKingdom.EN3475805:2002(E) 3 1 Scope Thisstandardspecifiesmetho

16、dsformeasuringthecharacteristicimpedanceofacable. ItshallbeusedtogetherwithEN3475100. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreferenceprovisionsfromotherpublications. Thesenormativereferencesarecitedattheappropriateplacesinthetextandthepublicationsarelisted hereafter.F

17、ordatedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplyto thisEuropeanStandardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthe latesteditionofthepublicationreferredtoapplies. EN3475100 AerospaceseriesCables,electrical,aircraftuseTestmethodsPart100:Genera

18、l EN3475804 AerospaceseriesCables,electrical,aircraftuseTestmethodsPart804:Velocityof propagation 3 Preparationofspecimens Theseshallbestrippedandpreparedforconnectiontothemeasuringdevice. 4 Methods 4.1 MethodA:measurementwithimpedancebridgeoncoaxialcable Lengthofsample: 3m Equipment:impedancemeasur

19、ingbridge Frequency:asindicatedintheproductstandard Measuringprinciple:theinputimpedanceofthesampleshallbemeasuredfirstwithitsendinopencircuit (Z co )andthenwithitsendinshortcircuit(Z cc ). Thecharacteristicimpedanceofthecableshallbecalculatedfromthesetwomeasurementsusingthe followingformula: cc co

20、c Z . Z Z = 4.2 MethodB:reflectometermeasurementoncoaxialcable Themeasurementshallbetakenusingthesameequipmentandonthesamesampleasforthevelocityof propagation,connectedinthesamewayaccordingtoEN3475804. ThecharacteristicimpedanceZ c ofthecableshallbecalculatedfromthereflectioncoefficientshownonthe os

21、cilloscopescreenusingtheformula: r - r + = 1 1 Z Z o c sothatZ o =valueinohmsofcharacteristicimpedanceincommonmode.EN3475805:2002(E) 4 Measurementof r shallbetakenonemetrefromthecableinput( t/3). Figure1 4.3 MethodC:shieldedsymmetriccablemeasurement Thecharacteristicimpedanceofthecableatthespecified

22、frequencyshallbederivedfromtheinput impedanceofalengthofcablewhenitsfarendisputinopenandshortcircuit,usingthefollowingformula: cc co c Z . Z Z = (1) Z co andZ cc shallbederivedfromthereflectioncoefficients r co and r cc attheinputofthelengthofcable, usingthefollowingformulas: co co b co 1 1 . Z Z r

23、- r + = (2) co cc b cc 1 1 . Z Z r - r + = (3) InwhichZ b isthecharacteristicimpedanceofthetestsetupattheplacewherethecableisconnected. 4.3.1 Apparatus Avectorielnetworkanalyserabletomakereflexionmeasurementononeportdevices Abalunwith: 1) coaxialportmatchedtothecharacteristicimpedanceZ c ofthenetwor

24、kanalyser; 2) symmetricalportwithcharacteristicimpedanceZ b =75 W . Seefigure2. Figure2EN3475805:2002(E) 5 4.3.2 Measurementprocedure Calibration Thescatteringparametersofthebalunshallbederivedfromthereflectioncoefficientsmeasuredatthe coaxialportofthebalunwhenitssymmetricalportisloadedasitfollows:

25、opencircuit r symco shortcircuit r symcc matchedZ b =75Wr symad bythefollowingformulas: s 11 = r symad (4) co sym cc sym co sym cc sym ad sym 2 s 22 r - r r - r - r = (5) s 12 .s 21 =( r symad - r symcc)(1s 22 )( 6 ) 4.3.3 Measurements Thevaluesofthereflectioncoefficientsatthecoaxialportofthebalunsh

26、allbemeasuredwiththe symmetricalportloadedbythelengthofcabletobemeasured,whenitsfarendisasitfollows: opencircuit r co shortcircuit r cc Thevaluesofthereflectionfactorattheinputofthecableshallbederivedfromtheabovevaluesbythe followingformulas: cc cc cc s s( s)s. s 11 22 11 12 21 = - -+ r r co co cc s

27、 s( s)s. s 11 22 11 12 21 = - -+ r r Z co andZ cc arederivedfromtheformulasgivenin(2)and(3). Z c isderivedfromtheformulagivenin(1). 5 Requirement Thecharacteristicimpedanceshallbewithinthelimitsindicatedintheproductstandard.BS EN 3475-805:2002 BSI 389 Chiswick High Road London W4 4AL BSI British Sta

28、ndards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British

29、Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the tec

30、hnical committee responsible, the identity of which can be found on the inside front cover. Tel: +44 (0)20 8996 9000. Fax: +44 (0)20 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying

31、standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: +44 (0)20 8996 9001. Fax: +44 (0)20 8996 7001. Email: ordersbsi-. Standards are also available from the BSI website at http:/www.bsi-. In response to orders for international

32、 standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical

33、Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel: +44 (0)20 8996 7111. Fax: +44 (0)20 8996 7048. Email: infobsi-. Subscribing members of BSI are kept up to date with stan

34、dards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel: +44 (0)20 8996 7002. Fax: +44 (0)20 8996 7001. Email: membershipbsi-. Information regarding online access to British Standards via

35、British Standards Online can be found at http:/www.bsi- Further information about BSI is available on the BSI website at http:/www.bsi-. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Exc

36、ept as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclude the free use, in

37、 the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. Details and advice can be obtained from the Copyright & Licensing Manager. Tel: +44 (0)20 8996 7070. Fax: +44 (0)20 8996 7553. Email: copyrightbsi-.

展开阅读全文
相关资源
猜你喜欢
相关搜索

当前位置:首页 > 标准规范 > 国际标准 > BS

copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
备案/许可证编号:苏ICP备17064731号-1