1、BRITISH STANDARDBS EN 3745-412:2005Aerospace series Fibres and cables, optical, aircraft use Test methods Part 412: Humidity resistanceICS 49.060g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g
2、37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 3745-412:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 February 2008 BSI 2008ISBN 978 0 580 55667 8National forewordThis British Standard is the UK implementation of EN 3745-412:2005
3、. The UK participation in its preparation was entrusted by Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology, to Panel ACE/6/-/10, Aerospace Fibre optic systems and equipment.A list of organizations represented on this committee can be obtained on request to its secr
4、etary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDA
5、RDNORME EUROPENNEEUROPISCHE NORMEN 3745-412November 2005ICS 49.060English VersionAerospace series - Fibres and cables, optical, aircraft use - Testmethods - Part 412: Humidity resistanceSrie arospatiale - Fibres et cbles optiques usagearonautique - Mthodes dessais - Partie 412 : Rsistance lhumiditLu
6、ft- und Raumfahrt - Faseroptische Leitungen frLuftfahrzeuge - Prfverfahren - Teil 412: Bestndigkeitgegen FeuchtigkeitThis European Standard was approved by CEN on 19 September 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving thi
7、s EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (Engl
8、ish, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech
9、 Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALI
10、SATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3745-412:2005: E2 Contents Foreword 3 1 Scope .4 2 Normative references .4 3 Preparation
11、of specimens 4 4 Apparatus 4 5 Method .5 EN 3745-412:20053 Foreword This European Standard (EN 3745-412:2005) has been prepared by the European Association of Aerospace Manufacturers - Standardization (AECMA-STAN). After enquiries and votes carried out in accordance with the rules of this Associatio
12、n, this Standard has re-ceived 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 national standard, either by publication of an identical text or by endorsement
13、, at the latest by May 2006, and conflicting national standards shall be withdrawn at the latest by May 2006. 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
14、all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Den-mark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, I
15、reland, Italy, Latvia, Lithuania, Luxem-bourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 3745-412:20054 1 Scope This standard specifies a method for checking the resistance optical fibre to differing levels of humidity. 2
16、Normative references The following referenced documents are indispensable for the application of this document. For dated refer-ences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2591-100, Aerospace seri
17、es 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: General1)EN 3745-201, Aerospace series Fibres and cables, optical, aircraft use Test methods Part 201: Visual examination EN 3
18、745-301, Aerospace series Fibres and cables, optical, aircraft use Test methods Part 301: Attenuation 3 Preparation of specimens 3.1 Specimen shall be prepared as specified in the product standard. If not at standard test conditions, the specimens shall be subjected to standard test conditions and s
19、tabilized at these conditions for 24 h as defined in EN 3745-100. The specimen shall be coiled with a bend radius not smaller than the specified storage radius. 3.2 Unless otherwise indicated in the technical specification the following details shall be specified: type of cable/fibre; number or leng
20、th of specimen if different from (10 1) mm; number of temperature humidity cycles, if not 56; specified storage radius; maximum residual attenuation after removal from bending test set-up. 4 Apparatus A Light Launch System (LLS) as defined in EN 2591-100. A Light Detector System (LDS) as defined in
21、EN 2591-100. 1) In preparation at the date of publication of this standard. EN 3745-412:20055 A test chamber designed so that its temperature and relative humidity are controlled. Condensed water from chamber walls or ceiling shall not drip on the specimens. 5 Method 5.1 Procedure For each specimen
22、perform the following procedure: The attenuation shall be monitored throughout the test in accordance with EN 3745-301, method C. Connect the specimen to the LLS and the LDS. Place the specimen in the test chamber. Perform the following phases: Phase 1: within 2 h, the temperature of the test chambe
23、r shall be uniformly raised to (65 3) C and the relative humidity increased to (95 23+) %. Phase 2: the above conditions shall be maintained for 6 h. Phase 3: within 16 h, the temperature shall be uniformly reduced to (38 4) C while the relative humid-ity is maintained as high as possible and shall
24、not decrease below 85 %. These three phases (see Figure 1) constitute one cycle. Perform the specified number of cycles. 5.2 Final measurements and requirements After removing each specimen from the test equipment, allow the specimen to recover to standard conditions, measure the attenuation in acco
25、rdance with EN 3745-301, method C. Examine each test specimen for damage in accordance with EN 3745-201: Visual examination. The attenuation shall not exceed the specified value. EN 3745-412:20056 Key 1 Initial conditions 2 Relative humidity (95 23+) % 3 Relative humidity min. 85 % 4 1stphase 5 2ndp
26、hase 6 3rdphase 7 1stcycle 8 2ndcycle Figure 1 EN 3745-412:2005blankBS EN 3745-412:2005BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the int
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