EN 3475-802-2009 en Aerospace series - Cables electrical aircraft use - Test methods - Part 802 Capacitance unbalance《航空航天系列 飞机用电缆 测试方法 第802部分 电容不平衡量》.pdf

《EN 3475-802-2009 en Aerospace series - Cables electrical aircraft use - Test methods - Part 802 Capacitance unbalance《航空航天系列 飞机用电缆 测试方法 第802部分 电容不平衡量》.pdf》由会员分享，可在线阅读，更多相关《EN 3475-802-2009 en Aerospace series - Cables electrical aircraft use - Test methods - Part 802 Capacitance unbalance《航空航天系列 飞机用电缆 测试方法 第802部分 电容不平衡量》.pdf（10页珍藏版）》请在麦多课文档分享上搜索。

1、BS EN3475-802:2009ICS 49.06NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDAerospace series Cables, electrical,aircraft use TestmethodsPart 802: Capacitance unbalance0This British Standardwas published under theauthority of the StandardsPolicy and StrategyCommit

2、tee on 31 March2009 BSI 2009ISBN 978 0 580 62409 4Amendments/corrigenda issued since publicationDate CommentsBS EN 3475-802:2009National forewordThis British Standard is the UK implementation of EN 3475-802:2009. Itsupersedes BS EN 3475-802:2002 which is withdrawn.The UK participation in its prepara

3、tion was entrusted to TechnicalCommittee ACE/6, Aerospace avionic electrical and fibre optictechnology.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are re

4、sponsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.BS EN 3475-802:2009EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3475-802February 2009ICS 49.060 Supersedes EN 3475-802:2002 English VersionAerospace series - Cables, electrical,

5、 aircraft use - Testmethods - Part 802: Capacitance unbalanceSrie arospatiale - Cbles lectriques usagearonautique - Mthodes dessais - Partie 802:Dsquilibre de capacitLuft- und Raumfahrt - Elektrische Leitungen frLuftfahrtverwendung - Prfverfahren - Teil 802:KapazittsdifferenzThis European Standard w

6、as approved by CEN on 11 July 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such natio

7、nalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and noti

8、fied to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta

9、, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitatio

10、n in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3475-802:2009: EBS EN 3475-802:2009EN 3475-802:2009 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Preparation of specimens .44 Apparatus .45 Method 46 Requirement .6BS EN 3475-802:2009EN 3475-802

11、:2009 (E) 3 Foreword This document (EN 3475-802:2009) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the N

12、ational Associations and the Official Services of the member countries of ASD, prior to its presentation to CEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2009, and conflicting nation

13、al standards shall be withdrawn at the latest by August 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes

14、 EN 3475-802:2002. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Icelan

15、d, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 3475-802:2009EN 3475-802:2009 (E) 4 1 Scope This standard specifies a method for measuring the capacitance unbalance f

16、or digital data transmission cable (within a pair or quad). It shall be used together with EN 3475-100. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the

17、latest edition of the referenced document (including any amendments) applies. EN 3475-100, Aerospace series Cables, electrical, aircraft use Test methods Part 100: General EN 3475-801, Aerospace series Cables, electrical, aircraft use Test methods Part 801: Capacitance per unit length 3 Preparation

18、of specimens These shall be stripped and prepared for connection to the measuring device. 4 Apparatus The capacitance shall be measured with an unbalance bridge at a frequency of (1 000 100) Hz. Various types of automatic or semiautomatic equipment may also be used. 5 Method 5.1 Screened pair capaci

19、tance unbalance Capacitance shall be measured as indicated in EN 3475-801. The length of the sample shall be 3 m or more. Capacitance unbalance as a percentage shall be determined from the following formula: cbabac) (2) (4100CCCCCD+= 5.2 Screened quad capacitance unbalance pair to pair Pair to pair

20、capacitance unbalance is illustrated in Figure 1, where 1 and 2 represent the two conductors of a pair and 3 and 4 represent the two conductors of another pair. The length of the sample shall be at least 100 m or more. Capacitance unbalance pair to pair per unit of length shall be determined from th

21、e following formula: Cpp = C13+ C24 C23 C14BS EN 3475-802:2009EN 3475-802:2009 (E) 5 Use the following formula if measured length is other than 100 metres: /100LcCppCpp= where Cpp is the unbalance in picofarads corrected to 100 metres; Cpp is the unbalance of cable length (m); Lc is the cable length

22、 (m). Figure 1 5.3 Screened quad capacitance unbalance pair to ground Pair to ground capacitance unbalance is illustrated in Figure 2, where 1 and 2 represent the two conductors of a pair and 3 and 4 represent the two conductors of another pair (in case of multi pair cable, all other pairs in cable

23、shall be connected together and grounded). The length of the sample shall be at least 100 m or more. Capacitance unbalance pair to ground per unit of length shall be determined from the following formula: Cpg = C10 C20Used the following formula if measured length is other than 100 metres: )/100(LcCp

24、gCpg= where Cpg is the unbalance in picofarads corrected to 100 metres; Cpg is the unbalance of cable length (m); Lc is the cable length (m). C24C23C14213 4C13BS EN 3475-802:2009EN 3475-802:2009 (E) 6 Figure 2 6 Requirement The value obtained shall not exceed the values specified in the product stan

25、dard. 3412C10C20BS EN 3475-802:2009This page has been intentionally left blank BS EN3475-802:2009BSI GroupHeadquarters 389Chiswick High Road,London, W4 4AL, UKTel +44 (0)20 8996 9001Fax +44 (0)20 8996 - British Standards InstitutionBSI is the independent national body responsible for preparing Brit

26、ishStandards. It presents the UK view on standards in Europe and at theinternational level. It is incorporated by Royal Charter.RevisionsBritish Standards are updated by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments oreditions.It is the con

27、stant aim of BSI to improve the quality of our products and services.We would be grateful if anyone finding an inaccuracy or ambiguity while usingthis British Standard would inform the Secretary of the technical committeeresponsible, the identity of which can be found on the inside front cover. Tel:

28、+44 (0)20 8996 9000. Fax: +44 (0)20 8996 7400.BSI offers members an individual updating service called PLUS which ensuresthat subscribers automatically receive the latest editions of standards.Buying standardsOrders for all BSI, international and foreign standards publications should beaddressed to

29、Customer Services. Tel: +44 (0)20 8996 9001. Fax: +44 (0)20 89967001 Email: You may also buy directly using a debit/creditcard from the BSI Shop on the Website http:/ response to orders for international standards, it is BSI policy to supply theBSI implementation of those that have been published a

30、s British Standards,unless otherwise requested.Information on standardsBSI provides a wide range of information on national, European andinternational standards through its Library and its Technical Help to ExportersService. Various BSI electronic information services are also available whichgive de

31、tails on all its products and services. Contact Information Centre. Tel:+44 (0)20 8996 7111 Fax: +44 (0)20 8996 7048 Email: Subscribing members of BSI are kept up to date with standards developmentsand receive substantial discounts on the purchase price of standards. For detailsof these and other be

32、nefits contact Membership Administration. Tel: +44 (0)208996 7002 Fax: +44 (0)20 8996 7001 Email: Information regarding online access to British Standards via British StandardsOnline can be found at http:/ information about BSI is available on the BSI website at http:/.CopyrightCopyright subsists in

33、 all BSI publications. BSI also holds the copyright, in theUK, of the publications of the international standardization bodies. Except aspermitted under the Copyright, Designs and Patents Act 1988 no extract maybe reproduced, stored in a retrieval system or transmitted in any form or by anymeans ele

34、ctronic, photocopying, recording or otherwise without prior writtenpermission from BSI.This does not preclude the free use, in the course of implementing the standard,of necessary details such as symbols, and size, type or grade designations. Ifthese details are to be used for any other purpose than implementation then theprior written permission of BSI must be obtained.Details and advice can be obtained from the Copyright and Licensing Manager.Tel: +44 (0)20 8996 7070 Email: