EN 3475-804-2002 en Aerospace Series - Cables Electrical Aircraft Use - Test Methods - Part 804 Velocity of Propagation《航空航天系列 飞机用电缆 测试方法 第804部分 传导速度》.pdf

《EN 3475-804-2002 en Aerospace Series - Cables Electrical Aircraft Use - Test Methods - Part 804 Velocity of Propagation《航空航天系列 飞机用电缆 测试方法 第804部分 传导速度》.pdf》由会员分享，可在线阅读，更多相关《EN 3475-804-2002 en Aerospace Series - Cables Electrical Aircraft Use - Test Methods - Part 804 Velocity of Propagation《航空航天系列 飞机用电缆 测试方法 第804部分 传导速度》.pdf（6页珍藏版）》请在麦多课文档分享上搜索。

1、BRITISH STANDARD AEROSPACE SERIES Cables, electrical, aircraft use Test methods Part 804: Velocity of propagation The European Standard EN 3475-804:2002 has the status of a British Standard ICs 49.060 BS EN 3475-80412002 WkNb A%“ U- rn% E rn NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY C

2、OPYRIGHT LAW $ 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 promulgate them in the UK. - A list of organizations represented on this subcommi

3、ttee can be obtained on request to its secretary. Cros s-r e ferenc es 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 Correspondence Index”, or b

4、y 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 ofitself confer immu

5、nity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 and 3 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. I

6、Date I Comments O BSI 25 June 2002 ISBN O 580 39910 9 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3475-804 June 2002 ICs 49.060 English version Aerospace series - Cables, electrical, aircraft use - Test methods - Part 804: Velocity of propagation Srie arospatiale - Cbles lectriques usage ar

7、onautique - Mthodes dessais - Partie 804: Vitesse de propagation Luft- und Raumfahrt - Elektrischen Leitungen fr Luftfahrt Verwendung - Prfverfahren -Teil 804: Ausbreitungsgeschwindigkeit This European Standard was approved by CEN on 20 January 2002 CEN members are bound to comply with the CENKENELE

8、C Internal Regulations which stipulate 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 m

9、ember. This European Standard exists 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 member

10、s are the national standards bodies 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

11、NORMUNG COMIT EUROPEN DE NORMALISATION 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 3475-804:2002 E EN 3475-80412002 (E) Foreword This document (EN 3475-804:2002) has

12、 been prepared by the European 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, prio

13、r 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 December 2002, and conflicting national standards shall be withdrawn at the latest by December 2002. According to the

14、CENKENELEC Internal Regulations, 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, Spai

15、n, Sweden, Switzerland and the United Kingdom. 2 EN 3475-80412002 (E) 1 Scope This standard specifies a method for measuring the velocity of propagation in a cable. It shall be used together with EN 3475-100. 2 Normative references This European Standard incorporates by dated or undated reference pr

16、ovisions from other publications. 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 i

17、t by amendment or revision. 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 for connection to the measu

18、ring device. 4 Method A real time reflectometer shall be used, delivering a reference signal, the rise time of which is equal to or less than 150 ps, fitted at the output to a precision coaxial air line, with a characteristic impedance of Z, (accuracy 1 %), and to an oscilloscope. The measurement sh

19、all be taken on a sample with a length of (3 f 0,Ol) m. The sample shall be prepared for the test so as to minimise mismatch at the cable input (using an appropriate connector or the shortest possible connections). The other end of the cable shall be open circuit. The sample shall be connected to th

20、e coaxial air line as follows: - coaxial cable; Centre and outer conductors connected to their counterparts in the coaxial air line. - symmetrical cables; Measurement in differential mode: each conductor of the pair shall be connected to one of the conductors of the coaxial air line; any screens sha

21、ll not be connected. The velocity of propagation in the cable shall be calculated from the measurement of propagation time t for go and return of the signal in the sample, by the formula: where : V is expressed in kilometres per second t is expressed in nanoseconds 5 The velocity of propagation shal

22、l be within the limits specified in the product standard. Req u i remen t 3 BS EN 3475-80412002 B SI 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 standards in Europ

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