1、Fibres and cables, optical, aircraft use Test methods Part 508: Torsion The European Standard EN 3745-508:2002 has the status of a British Standard ICs 49.060 BS EN 3745-50812002 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 3745-508:2002 Amd. No. National foreword Thi
2、s 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/6/10, Aerospace - fibre optic systems and equipment, which has the responsibi
3、lity to: EN 3745-508:2002. 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 25 June 2002 - - aid enquirers to understand the text;
4、 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 represented on this subcommi
5、ttee 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 Correspondence Index”, or
6、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 of itself confer im
7、munity 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. OBSI 25 June 2002 ISBN
8、O 580 39901 X EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3745-508 June 2002 ICs 49.060 English version Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 508: Torsion Srie arospatiale - Fibres et cbles optiques usage aronautique - Mthodes dessais - Partie 508
9、: Torsion Luft- und Raumfahrt - Faseroptische Leitungen fr Luftfahrzeuge - Prfverfahren -Teil 508: Torsion This European Standard was approved by CEN on 1 March 2002 CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Stand
10、ard 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 exists in three official versions (English, French, Ge
11、rman). 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 bodies of Austria, Belgium, Czech Republic, Denmark, Fi
12、nland, 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 NORMALISATION Management Centre: rue de Stassart, 36 B-1050
13、 Brussels O 2002 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3745-508:2002 E EN 3745-508:2002 (E) Foreword This document (EN 3745-508:2002) has been prepared by the European Association of Aerospace Manufacturers (AECMA). After
14、 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. This European Standard shall be given the status of a
15、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 Regulations, the national standards organizations of the followi
16、ng 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 United Kingdom. 2 EN 3745-508:2002 (E) 1 Scope This s
17、tandard specifies a method of checking the resistance to damage under torsion of an optical cable for aerospace applications. 2 Normatives references This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appr
18、opriate 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. For undated references the latest edition of the publi
19、cation referred to applies. EN 2591-100 Aerospace series - Elements of electrical and optical connection - Test methods - Part 100: General 1) EN 3745-100 Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 100: General 2) EN 3745-201 Aerospace series - Fibres and cable
20、s, optical, aircraft use - Test methods - Part 201 : Visual examination EN 3745-301 Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 301 : Attenuation EN 3745-505 Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 505: Tensile strength
21、2) 3 Preparation of specimens 3.1 The specimens shall be terminated with a connecting system allowing connection to the Light Launch System (LLS) and Light Detection System (LDS) as defined in EN 2591-100. If not yet at standard test conditions, the specimens shall be subjected to standard test cond
22、itions and stabilized at these conditions for 24 h as defined in EN 3745-100. 3.2 Unless specified in the technical specification, the following details shall be stated: - type and length of cable; - number of cycles if not 100; - load to be applied; - maximum permissible variation of attenuation; -
23、 maximum value of insertion loss; - minimum value of the pulling test of the specimen at the end of the torsion test; - distance (i) between the rotating grip and the fixed grip. 1) Published as AECMA Prestandard at the date of publication of this standard 2) In preparation at the date of publicatio
24、n of this standard 3 EN 3745-508:2002 (E) 4 Apparatus The apparatus shall comprise: - a Light Launch System (LLS) as defined in EN 2591-100; - a Light Detection System (LDS) as defined in EN 2591-100; - a test setup capable of applying the torsion load required by the test specification. A typical a
25、rrangement is shown in figure 1. I Rotation of the cable I One cycle * 360“ 1 Specimen Moving support 4-J Weight Figure 1 5 Method 5.1 Procedure - Install the cable in the test equipment, at a zero angle of torsion. - Connect the specimen to LLS and LDS. - Zero the LDS. Unless otherwise stated in th
26、e product standard, the following test shall apply : - the cable shall be rotated first 360“ in one direction then at 720“ in the opposite direction. It shall then be returned to the starting position (360“ in the first direction). This defines one cycle; - the number of cycles shall be 100; - the c
27、yclic rate shall be 6 cycles/min. The attenuation (EN 3745-301, method C) shall be monitored throughout the test. 5.2 Final measurements and requirements - EN 3745-201 - EN 3745-505 4 BS EN 3745-50812002 B SI 389 Chiswick High Road London W4 4AL BSI -British Standards Institution BSI is the independ
28、ent 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 Standards should make sure that they p
29、ossess 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 technical committee responsible, the iden
30、tity 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 standards Orders for all BSI, internat
31、ional and foreign standards publications should be addressed to Customer Services. Tel: +44 (0)20 8996 9001. Fax: +44 (0)20 8996 7001. Email: ordersmsi-. Standards are also available from the BSI website at http :/www.bsi-. In response to orders for international standards, it is BSI policy to suppl
32、y 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 Help to Exporters Service. Various BS
33、I electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel: +44 (0)20 8996 71 11. Fax: +44 (0)20 8996 7048. Email: infosi-. Subscribing members of BSI are kept up to date with standards developments and receive substa
34、ntial 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: member shipmsi-global. com. Information regarding online access to British Standards via British Standards Online
35、can be found at http :/www.bsi- Further information about BSI is available on the BSI website at ht tp :/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. Except as permitted under
36、 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 the course of impl
37、ementing the standard, ofnecessary details such as symbols, and size, type or grade designations. Ifthese 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 fkom the Copyright & Licensing Manager. Tel: +44 (0)20 8996 7070. Fax: +44 (0)20 8996 7553. Email: cop yrighmsi-global .com.
