1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 3745-405:2012Aerospace series Fibres andcables, optical, aircraft use Test methodsPart 405: Low/High temperature bend testBS EN 3745-405:2012 BRITISH STANDARDNational forew
2、ordThis British Standard is the UK implementation of EN 3745-405:2012.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/6, Aerospace avionic electrical and fibre optictechnology.A list of organizations represented on this committee can beobtained on request to its secre
3、tary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 77588 8ICS 49.060Compliance with a British Standard cannot confe
4、r immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 July 2012.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3745-405 July 2012 ICS 49.090 English Versi
5、on Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 405: Low/High temperature bend test Srie arospatiale - Fibres et cbles optiques usage aronautique - Mthodes dessais - Partie 405: Essai de courbure aux tempratures basse/haute Luft- und Raumfahrt - Faseroptische Lei
6、tungen fr Luftfahrzeuge - Prfverfahren - Teil 405: Biegeprfung bei niedriger/hoher Temperatur This European Standard was approved by CEN on 23 March 2012. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the st
7、atus 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 CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French,
8、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 CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cro
9、atia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
10、United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3745-405
11、:2012: EBS EN 3745-405:2012EN 3745-405:2012 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Preparation of specimens .44 Apparatus .55 Method 6BS EN 3745-405:2012EN 3745-405:2012 (E) 3 Foreword This document (EN 3745-405:2012) has been prepared by the Aerospace and Defence Industrie
12、s 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 National Associations and the Official Services of the member countries of ASD, prior to its presentation to CE
13、N. 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 January 2013, and conflicting national standards shall be withdrawn at the latest by January 2013. Attention is drawn to the possibility that som
14、e 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. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to impl
15、ement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania
16、, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 3745-405:2012EN 3745-405:2012 (E) 4 1 Scope This European Standard specifies a method of determining the attenuation variation of an optical cable during mechanical bending under load at the maximum and minimum op
17、erating temperatures. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced documen
18、t (including any amendments) applies. EN 2591-100, Aerospace series Elements of electrical and optical connection Test methods Part 100: General EN 3745-100, Aerospace series Fibres and cables, optical, aircraft use Test methods Part 100: General EN 3745-201, Aerospace series Fibres and cables, opti
19、cal, aircraft use Test methods Part 201: Visual examination EN 3745-301, Aerospace series Fibres and cables, optical, aircraft use Test methods Part 301: Attenuation 3 Preparation of specimens 3.1 If not at the standard test conditions, the specimens shall be subjected to standard test conditions an
20、d stabilized at these conditions for 24 h as defined in EN 3745-100. 3.2 The following details shall be specified if not already included in the product standard: The number and length of specimens; The upper and lower temperatures at which test is carried out; The mandrel diameter and number of wra
21、ps; The maximum permissible variation in attenuation; The required loads to be applied during the test; The wavelengths to be measured. BS EN 3745-405:2012EN 3745-405:2012 (E) 5 4 Apparatus 4.1 The apparatus shall comprise: A Light Launch System (LLS) as defined in EN 2591-100; A Light Detection Sys
22、tem (LDS) as defined in EN 2591-100; A test fixture suitable for attaching the specimen with weights to a rotating mandrel; A suitable environmental chamber capable of meeting the specified temperatures 2 C. A typical arrangement is shown in Figure 1. Key 1 Fibre optic cable 2 Loads 3 Mandrel 4 Wind
23、ing direction 5 LLS 6 LDS Figure 1 BS EN 3745-405:2012EN 3745-405:2012 (E) 6 5 Method 5.1 Procedure 1) Connect the specimen to the LLS and LDS. 2) Place specimen in the environmental chamber and attach the specimen to the mandrel, in preparation for winding. 3) Attach loads to source and detection e
24、nd of cable. 4) Measure the initial optical transmittance measurements at wavelengths according to the applicable product standard to establish a reference. 5) Condition the specimen for four (4) hours at the low temperature test condition specified in the applicable product standard. 6) Measure the
25、 optical transmittance values at the end of the four (4) hours conditioning at the low temperature test condition prior to winding on the mandrel. 7) After the four (4) hours conditioning period and while the cable is still at the test temperature, wind cable two turns on to the mandrel using a stea
26、dy rate of two turns per minute. While specimen is still wrapped on the mandrel measure the optical transmittance. 8) Unwind the specimen and measure the optical transmittance. 9) Allow the specimen to come to room temperature. 10) Repeat steps 5) through to 9) at the high temperature test condition
27、 specified in the applicable product standard. 5.2 Final measurements and requirements The difference in attenuation of the conditioned specimen before and after mandrel winding at both temperatures shall be less than the specified value in the applicable product standard. Perform a visual examinati
28、on according to EN 3745-201. This page deliberately left blankBSI is the independent national body responsible for preparing British Standards and other standards-related publications, information and services. It presents the UK view on standards in Europe and at the international level. BSI is inc
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