1、BRITISH STANDARD AEROSPACE SERIES BS EN 2499:1990 Specification for Computer output microfiche (COM) A6 microfiche This European Standard EN2499 has the status of a British Standard. UDC 629.7.651.925.004.4:778.14.071BSEN2499:1990 This British Standard was published under the authority ofthe Board o
2、f BSI and comes intoeffect on 28September1990 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/-/1 Draft for comment 84/76076 DC ISBN 0 580 18677 6 Cooperating organizations The European Committee for Standardization, under whose supervision this
3、European Standard was prepared, comprises the national standards organizations of the following Western European countries. Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation Cenmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito, r.y. France Associati
4、on franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Ireland National Standards Authority of Ireland Italy Ente Nazionale Italiano di Unificazione Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund P
5、ortugal Instituto Portugus da Qualidade Spain Institute Espaol de Normalizacin Sweden Standardiseringskommissionen i Sverige Switzerland Association suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd. No. Date of issue CommentsBSEN2499:1990 B
6、SI 01-2000 i Contents Page Cooperating organizations Inside front cover National foreword ii Brief history 2 Text of EN 2499 3 National appendix A Inside back cover National appendix B Inside back coverBSEN2499:1990 ii BSI 01-2000 National foreword This British Standard has been prepared under the d
7、irection of the Aerospace Standards Policy Committee and is the English language version of EN2499“Aerospace series. Computer output microfiche (COM) A6 microfiche” published by the European Committee for Standardization (CEN). EN2499 was produced as a result of international discussion in which the
8、 UK took an active part. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages
9、 This document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2to4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside f
10、ront cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN2499 April1987 UDC629.7.651.925.004.4:778.14.071 Key words: Reproduction, recording characteristics, photographic recording, technical drawings, microfilm, micrographics, files, document storage, computer output microfiches. English vers
11、ion Aerospace series Computer output microfiche (COM) A6 microfiche Srie arospatiale Composition en sortie dordinateur sur microforme (COM) Microfiche A6 Luft- und Raumfahrt Com-Film (Computer Output Microfilm) Mikroplanfilm A6 This European Standard was accepted by CEN on12 August1986. CEN members
12、are bound to comply with the requirements of CEN Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on appli
13、cation to the CEN Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to CEN Central Secretariat h
14、as the same status as the official versions. CEN members are the national standards organizations of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Ireland, Italy, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN European Committee for Standardization Co
15、mit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels CEN1987 Copyright reserved to all CEN members Ref No. EN2499:1987 EEN2499:1987 BSI 01-2000 2 Brief history This European Standard has been prepared by the European Association of Aero
16、space Constructors (AECMA). After enquiries and votes carried out in accordance with the rules of this Association it has successively received the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN. According to the Com
17、mon CEN/CENELEC Rules, the following countries are bound to implement this European Standard: Belgium, France, Germany, Italy, Netherlands, Spain, United Kingdom. Contents Page Brief history 2 0 Introduction 3 1 Scope and field of application 3 2 Reference 3 3 Composition 3 4 Duplicates 3 Figure 4EN
18、2499:1987 BSI 01-2000 3 0 Introduction Computer output microfiche is used for storing, distributing and filing data originating from data processing systems or procedures by directly transferring and recording the data on microfiche without intermediate carrier (e.g.paper). 1 Scope and field of appl
19、ication This standard specifies the deviations from ISO5126 1)necessary for aerospace application. It shall be applied for filming data (e.g.alpha-numeric data processing output) on A6 microfiche in order to ensure uniform presentation of the microform for the exchange of information in the aerospac
20、e industry. 2 Reference ISO 5126:1980, Micrographics Computer output microfiche (COM) Microfiche A6. 3 Composition 3.1 Reduction ratio The reduction ratio of1:48 (nominal value) shall be used for filming. 3.2 Frame arrangement The arrangement corresponds to the arrangement of images No.5 of ISO5126:
21、 18 columns 15 rows =270 frames Each frame shall be identified with the corresponding alpha-numeric coordinates. Indication of the coordinates in the margins or at the bottom of the title area is optional. 3.3 Image sequence The images shall be arranged in vertical image sequence (saw tooth form). T
22、he first microimage is located at the top left corner of the grid. Subsequent microimages appear in sequence from top to bottom and form left to right, advancing by columns (seeFigure). 4 Duplicates 4.1 Film Diazo film is recommended for duplicates. 4.2 Image polarity Duplicates shall have light lin
23、es and characters on a dark background (negative appearing image). 4.3 Generation For the exchange of information between organisations, only duplicates (2nd generation) made directly from the camera film should be used. 4.4 Title area Duplicates with a colour backed title area are not suitable for
24、further duplication. 1) Consequently, the data not given in this standard is to be obtained from ISO5126.EN2499:1987 4 BSI 01-2000 Figure BSEN2499:1990 BSI 01-2000 National appendix A The United Kingdom participation in the preparation of this European Standard was entrusted by the Aerospace Standar
25、ds Policy Committee (ACE/-) to Technical Committee ACE/-/1 upon which the following bodies were represented: British Airways Civil Aviation Authority (Airworthiness Division) Ministry of Defence Society of British Aerospace Companies Ltd. National appendix B The British Standard corresponding to ISO
26、5126 referred to in clause 2 is BS5644 “Specification for computer output microfiche (COM), A6 size”.BS EN 2499:1990 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on sta
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