BS EN 3745-705-2007 Aerospace series — nFibres and cables noptical aircraft use — nTest methods — nPart 705 Contrast measurement n《航空航天系列 飞行器用光纤和光缆 试验方法 对比度测量》.pdf

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1、Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 07/07/2008 04:25, Uncontrolled Copy, (c) BSIg49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58T

2、est methods Part 705: Contrast measurementICS 49.060Aerospace series Fibres and cables, optical, aircraft use BRITISH STANDARDBS EN 3745-705:2007BS EN 3745-705:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 07/07/2008 04:25, Uncontrolled Copy, (c) BSIThis British Standard was published u

3、nder the authority of the Standards Policy and Strategy Committee on 31 March 2008 BSI 2008ISBN 978 0 580 53160 6Amendments/corrigenda issued since publicationDate Commentscontract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal

4、 obligations.National forewordThis British Standard is the UK implementation of EN 3745-705:2007.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 equipme

5、nt.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 provisions of a EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3745-705December 2007ICS 49.060English VersionAerospace series - Fibre

6、s and cables, optical, aircraft use - Testmethods - Part 705: Contrast measurementSrie arospatiale - Fibres et cbles optiques usagearonautique - Mthodes dessais - Partie 705 : Mesure decontrasteLuft- und Raumfahrt - Faseroptische Leitungen frLuftfahrzeuge - Prfverfahren - Teil 705: KontrastmessungTh

7、is 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 status of a national standard without any alteration. Up-to-date lists and bibliographical references

8、 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 of a CEN member into its

9、 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, Italy, Latvia, Lithua

10、nia, 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-1050 Brussels 2007 CEN A

11、ll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3745-705:2007: ELicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 07/07/2008 04:25, Uncontrolled Copy, (c) BSIEN 3745-705:2007 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative refere

12、nces 4 3 Terms and definitions .4 4 Preparation of samples .4 5 Test equipment 5 6 Process .6 BS EN 3745-705:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 07/07/2008 04:25, Uncontrolled Copy, (c) BSIEN 3745-705:2007 (E) 3 Foreword This document (EN 3745-705:2007) has been prepared by th

13、e 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 approval of the National Associations and the Official Services of the member countries of ASD

14、, 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 June 2008, and conflicting national standards shall be withdrawn at the latest by June 2008. Attention is drawn

15、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. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following

16、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, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,

17、 Spain, Sweden, Switzerland and the United Kingdom. BS EN 3745-705:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 07/07/2008 04:25, Uncontrolled Copy, (c) BSIEN 3745-705:2007 (E) 4 1 Scope This standard specifies the process to be applied for measuring different colour densities of cable

18、 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 application of this document. For dated references, only the edition cited applies. For undated references, t

19、he 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 the purposes of this document, the following terms and definitions apply. 3.1 contrast ratio of reflectin

20、g 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 Preparation of samples The cable samples shall be identified in compliance with applicable manufacturing instruc

21、tion 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 be in colour and shall have sharply defined marking edges i.e. marks are correctly focussed. Before starti

22、ng 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-1030 Wien - Austria. BS EN 3745-705:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 07/07/2008 0

23、4:25, Uncontrolled Copy, (c) BSIEN 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 external inf

24、luences. 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 scattere

25、d 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-publication

26、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 is the

27、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. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 07/07/2008 04:25, Uncontrolled

28、 Copy, (c) BSIBS EN BSILicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 07/07/2008 04:25, Uncontrolled Copy, (c) BSI389 Chiswick High RoadLondonW4 4AL3745-705:2007BSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the

29、UK view on standards in Europe and at the international level. It is incorporated by Royal Charter.RevisionsBritish Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions.It is the constant aim of BSI to improve

30、 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 identity of which can be found on the inside front cover. Tel: +44 (0)20 8996 9000. Fa

31、x: +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 standardsOrders for all BSI, international and foreign standards publications should be addressed to Customer Services. Te

32、l: +44 (0)20 8996 9001. Fax: +44 (0)20 8996 7001. Email: ordersbsi-. Standards are also available from the BSI website at http:/www.bsi-.In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless

33、 otherwise requested.Information on standardsBSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its produc

34、ts and services. Contact the Information Centre. Tel: +44 (0)20 8996 7111. Fax: +44 (0)20 8996 7048. Email: infobsi-.Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefit

35、s contact Membership Administration. Tel: +44 (0)20 8996 7002. Fax: +44 (0)20 8996 7001. Email: membershipbsi-.Information regarding online access to British Standards via British Standards Online can be found at http:/www.bsi- information about BSI is available on the BSI website at http:/www.bsi-.

36、CopyrightCopyright 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 the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitt

37、ed 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 implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these 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 from the Copyright & Licensing Manager. Tel: +44 (0)20 8996 7070. Fax: +44 (0)20 8996 7553. Email: copyrightbsi-.

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