1、BRITISH STANDARDBS EN 3745-203:2008Aerospace series Fibres and cables, optical, aircraft use Test methods Part 203: Cable dimensionsICS 49.060g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g
2、60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 3745-203:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 May 2008 BSI 2008ISBN 978 0 580 53158 3National forewordThis British Standard is the UK implementation of EN 3745-203:2008. The UK
3、 participation in its preparation was entrusted to Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provi
4、sions 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 STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3745-203April 2008ICS 49.060English Ver
5、sionAerospace series - Fibres and cables, optical, aircraft use - Testmethods - Part 203: Cable dimensionsSrie arospatiale - Fibres et cbles optiques usagearonautique - Mthodes dessais - Partie 203 :Dimensions des cblesLuft- und Raumfahrt - Faseroptische Leitungen frLuftfahrzeuge - Prfverfahren - Te
6、il 203: Mae LeitungenThis European Standard was approved by CEN on 23 June 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bib
7、liographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility o
8、f a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland
9、, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1
10、050 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3745-203:2008: E2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Preparation of specimens.4 4 Apparatus .4 5 Method 5 6 Final measurements and requiremen
11、ts.5 BS EN 3745-203:20083 Foreword This document (EN 3745-203:2008) has been prepared by the Aerospace and Defence Industries 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 app
12、roval of the National Associations and the Official Services of the member countries of ASD, 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, at the latest by October 2008, and con
13、flicting national standards shall be withdrawn at the latest by October 2008. 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 all such patent rights. Accordin
14、g to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
15、Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 3745-203:20084 1 Scope This standard specifies a method of measuring the dimensions of fibre optic cables. It shall be used together with EN 3745
16、-100. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 3745-100, Aerospa
17、ce series Fibres and cables, optical, aircraft use Test methods Part 100: General. 1)3 Preparation of specimens 3.1 Dimensions 3.1.1 Tube and jacket Each sample shall consist of a cross-sectional slice of insulation from the cable. The sample should be cut and then be placed under the measuring equi
18、pment with the plane of cut perpendicular to the optical axis. 3.1.2 Tight buffer Prepare a sample of a minimum of 3 m in length. 3.2 Mass Prepare a sample of a minimum of 1 m in length. 4 Apparatus 4.1 Buffer and jacket dimensions The measurements shall be carried out either with a profile projecto
19、r, or measuring microscope or equivalent apparatus having at least 10 magnification. Readings shall be taken to 2 decimal places and an estimated 3 decimal places with a specified thickness less than 0,5 mm. 4.2 Mass The mass and length of the specimen shall be determined with an apparatus having an
20、 accuracy of at least 1 %. 1) Published as ASD Prestandard at the date of publication of this standard. BS EN 3745-203:20085 5 Method 5.1 Buffer and external diameter Measure the outside diameter (OD) of the specimen in at least three locations approximately one meter apart. Each measurement shall c
21、onsist of two micrometer readings taken at 90 from each other. 5.2 Buffer tube and jacket thickness and concentricity 5.2.1 The sample shall be placed under the measuring equipment with the plane of cut perpendicular to the optical axis. The radial thickness shall be measured and recorded at the thi
22、nnest and thickest points. 5.2.2 The concentricity shall be expressed as 100 times the ratio of the minimum radial thickness to the maximum radial thickness. 5.3 Mass The measurement shall be made on a specimen whose length shall be given in the technical specification. 6 Final measurements and requ
23、irements 6.1 Buffer dimensions 6.1.1 Tight buffer The characteristics shall conform to requirements given in the technical specification or the product standard. 6.1.2 Loose tube The characteristics shall conform to the requirements given in the technical specification or the product standard. The m
24、inimum value of the concentricity shall conform to the requirements given in the technical specification or the product standard. 6.2 External diameter The external diameter, minimum radial thickness, maximum radial thickness and concentricity shall conform to that stated in the product standard. No
25、ne of the individual readings shall exceed the maximum specified value defined in product standard. 6.3 Mass The mass of the cable, expressed in kg/km, shall conform to the value given in the product standard. BS EN 3745-203:2008BS EN 3745-203:2008BSI389 Chiswick High RoadLondonW4 4ALBSI British Sta
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