1、BRITISH STANDARDBS EN 3745-705:2007Aerospace series Fibres and cables, optical, aircraft use Test methods Part 705: Contrast measurementICS 49.060g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3
2、g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 3745-705:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2008 BSI 2008ISBN 978 0 580 53160 6National forewordThis British Standard is the UK implementation of EN 3745-705:2007.T
3、he 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 secreta
4、ry.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 STANDARDN
5、ORME EUROPENNEEUROPISCHE NORMEN 3745-705December 2007ICS 49.060English VersionAerospace series - Fibres and cables, optical, aircraft use - Testmethods - Part 705: Contrast measurementSrie arospatiale - Fibres et cbles optiques usagearonautique - Mthodes dessais - Partie 705 : Mesure decontrasteLuft
6、- und Raumfahrt - Faseroptische Leitungen frLuftfahrzeuge - Prfverfahren - Teil 705: KontrastmessungThis European Standard was approved by CEN on 25 July 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the
7、 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 CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German)
8、. A version in any other language made by translationunder the responsibility of 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 Republi
9、c, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMAL
10、ISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3745-705:2007: EEN 3745-705:2007 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative ref
11、erences 4 3 Terms and definitions .4 4 Preparation of samples .4 5 Test equipment 5 6 Process .6 BS EN 3745-705:2007EN 3745-705:2007 (E) 3 Foreword This document (EN 3745-705:2007) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enq
12、uiries 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 CEN. This European Standard shall be given the status of a nation
13、al standard, either by publication of an identical text or by endorsement, at the latest by June 2008, and conflicting national standards shall be withdrawn at the latest by June 2008. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent right
14、s. 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 implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Cze
15、ch Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 3745-705:2007EN 3745-705:2007 (E) 4 1
16、Scope This standard specifies the process to be applied for measuring different colour densities of cable identification markings. It is designed to define a reproducible process of contrast value determination. 2 Normative references The following referenced documents are indispensable for the appl
17、ication 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. ISO 7724-1, Paints and varnishes Colorimetry Part 1: Principles CIE 15, Colorimetry 1)3 Terms and definitions For
18、the purposes of this document, the following terms and definitions apply. 3.1 contrast ratio of reflecting light (here: reflecting light of cable identification marking and cable surface) 3.2 illuminance reflection of visible light 3.3 measuring range maximum effective range of measurement 4 Prepara
19、tion of samples The cable samples shall be identified in compliance with applicable manufacturing instruction using the power density specified in the technical specification. The surfaces of the cable samples shall be clean and without damage. The identification markings to be measured shall even b
20、e in colour and shall have sharply defined marking edges i.e. marks are correctly focussed. Before starting measurements clean the surfaces with a soft, lint-free cloth to avoid distortion of test results by a roughened surface or “deposits“. 1) Published by CIE Central Bureau - Kegelgasse 27 - A-10
21、30 Wien - Austria. BS EN 3745-705:2007EN 3745-705:2007 (E) 5 5 Test equipment 5.1 Components of the measuring device The measuring device comprises a photometer, lighting equipment and a cable handling device. The whole set-up shall be designed to ensure that test results are not falsified by extern
22、al influences. The photometer installation shall be stable and free from vibrations, and influences by external light and reflections from scattered light shall be excluded. 5.2 Equipment colour The device for handling cable samples and accessories shall be designed in matt black colour to absorb sc
23、attered light. 5.3 Illuminance Illuminance shall be determined with a calibrated electrical photometer. The manufacturer instructions concerning the measuring probe work range and operating instructions shall be observed. Measuring sensitivity of the photometer shall be in conformity with CIE-public
24、ation 15. 5.4 Diameter of measuring spot The admissible diameter of the measuring spot shall not exceed 75 % of the marking size (X and Y dimension). Measuring tolerance of the photometer shall be diameter of measuring spot). The contrast is calculated as follows: K = %100max.min.max.LLL )(where K i
25、s the contrast; L is the light intensity. 6.5 Requirement The contrast value as determined between cable identification marking and cable surface shall conform to the specifications of the corresponding product standard. BS EN 3745-705:2007BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards I
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