1、BRITISH STANDARD AEROSPACE SERIES Cables, electrical, aircraft use Test methods Part 801 : Capacitance per unit length The European Standard EN 3475-801:2002 has the status ofa British Standard ICs 49.060 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 3475-801 12002 BS
2、EN 3475-801 12002 Amd. No. National foreword This British Standard is the official English language version of The UKparticipation in its preparation was entrusted by Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology, to Subcommittee ACE/6/2, Aerospace - Cables, whic
3、h has the responsibility to: EN 3475-801 :2002. Date Comments 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 3 July 2002 - - aid enquirers to
4、understand the text; present to the responsible internationalA3uropean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations represen
5、ted on this subcommittee can be obtained on request to its secretary. Cros s-r e fer en ces 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 Corres
6、pondence 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
7、 of itself confer immunity from legal obligations. 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. O B
8、SI 3 July 2002 ISBN O 580 39961 3 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3475-801 June 2002 ICs 49.060 English version Aerospace series - Cables, electrical, aircraft use - Test methods - Part 801 : Capacitance per unit length Srie arospatiale - Cbles lectriques usage aronautique - Mth
9、odes dessais - Partie 801: Capacit linique Luft- und Raumfahrt - Elektrischen Leitungen fr Luftfahrt Verwendung - Prfverfahren - Teil 801: Betriebskapazitt This European Standard was approved by CEN on 20 January 2002 CEN members are bound to comply with the CENKENELEC Internal Regulations which sti
10、pulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. This European Standard ex
11、ists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bod
12、ies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALI
13、SATION Management Centre: rue de Stassart, 36 B-1050 Brussels O 2002 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3475-801:2002 E EN 3475-801 :2002 (E) Foreword This document (EN 3475-801 :2002) has been prepared by the European
14、 Association of Aerospace Manufacturers (AECMA). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN.
15、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 December 2002, and conflicting national standards shall be withdrawn at the latest by December 2002. According to the CENKENELEC Internal Regulation
16、s, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the
17、 United Kingdom 2 EN 3475-801 :2002 (E) 1 Scope This standard specifies a method for measuring the capacitance per unit length of a cable. It shall be used together with EN 3475-100. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other public
18、ations. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision
19、. For undated references the latest edition of the publication referred to applies. EN 3475-100 Aerospace series - Cables, electrical, aircraft use - Test methods - Part 100: General 3 Preparation of specimens These shall be stripped and prepared so as to give the measurements between the different
20、points specified in 4. 4 Method Capacitance per unit length shall be measured on a sample of a length of one metre or more, at a frequency between 800 Hz and 1 O00 Hz, to an accuracy of I 1 %. 4.1 Coaxial structure The capacitance shall be measured between the inner and outer conductors. 4.2 Unscree
21、ned pair The capacitance shall be measured between the two conductors. 3 EN 3475-801 :2002 (E) 4.3 Screened pair Perform the following measurements: Ca : Capacitance between element 1 and element 2 connected to screening _ _ _ _ _ _ - cb : Capacitance between element 2 and element 1 connected to scr
22、eening Cc : Capacitance between element 1 and element 2 joined and screening _-_ These capacitances shall be expressed in picofarads. The effective capacitance per unit length of the pair, expressed in picofarads per metre, is obtained from the form u la: where L is the length of the sample expresse
23、d in metres. 4.4 If the pairs are individually screened, the method described in 4.1 shall be used for each pair. If the pairs have no individual screening, the method in 4.3 shall be used, connecting to the screening all wires not belonging to the pair being tested. Case of a multipair cable 5 Req
24、u i remen t The effective capacitance per unit length, expressed in picofarads per metre, shall lie between the limits indicated in the product standard. 4 BS EN 3475-801 12002 B SI 389 Chiswick High Road London W4 4AL BSI -British Standards Institution BSI is the independent national body responsib
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