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1、BRITISH STANDARD AEROSPACE SERIES BS EN 2499:1990 Specification for Computer output microfiche (COM) A6 microfiche This European Standard EN 2499 has the status of a British Standard. UDC 629.7.651.925.004.4:778.14.071 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 17:26:19 GMT+00:00 2006, U
2、ncontrolled Copy, (c) BSI BS EN 2499:1990 This British Standard was published under the authority of the Board of BSI and comes into effect on 28 September 1990 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/-/1 Draft for comment 84/76076 DC ISB
3、N 0 580 18677 6 Cooperating organizations The European Committee for Standardization, under whose supervision this European Standard was prepared, comprises the national standards organizations of the following Western European countries. AustriaOesterreichisches Normungsinstitut BelgiumInstitut bel
4、ge de normalisation CenmarkDansk Standardiseringsraad FinlandSuomen Standardisoimisliito, r.y. FranceAssociation franaise de normalisation GermanyDeutsches Institut fr Normung e.V. GreeceHellenic Organization for Standardization IrelandNational Standards Authority of Ireland ItalyEnte Nazionale Ital
5、iano di Unificazione NetherlandsNederlands Normalisatie-instituut NorwayNorges Standardiseringsforbund PortugalInstituto Portugus da Qualidade SpainInstitute Espaol de Normalizacin SwedenStandardiseringskommissionen i Sverige SwitzerlandAssociation suisse de normalisation United KingdomBritish Stand
6、ards Institution Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 17:26:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 2499:1990 BSI 01-2000i Contents Page Cooperating organizationsInside front cover National forewordii Bri
7、ef history2 Text of EN 24993 National appendix AInside back cover National appendix BInside back cover Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 17:26:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 2499:1990 ii BSI 01-2000 National foreword This British Standard has been prepared u
8、nder the direction of the Aerospace Standards Policy Committee and is the English language version of EN 2499 “Aerospace series. Computer output microfiche (COM) A6 microfiche” published by the European Committee for Standardization (CEN). EN 2499 was produced as a result of international discussion
9、 in which the 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. Sum
10、mary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 4, 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 ta
11、ble on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 17:26:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2499 April 1987 UDC 629.7.651.925.004.4:778.14.071 Key words: Reproduction, recording characteristics, photog
12、raphic recording, technical drawings, microfilm, micrographics, files, document storage, computer output microfiches. English version Aerospace series Computer output microfiche (COM) A6 microfiche Srie arospatiale Composition en sortie dordinateur sur microforme (COM) Microfiche A6 Luft- und Raumfa
13、hrt Com-Film (Computer Output Microfilm) Mikroplanfilm A6 This European Standard was accepted by CEN on 12 August 1986. CEN members 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
14、 without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application 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 l
15、anguage made by translation under the responsibility of a CEN member into its own language and notified to CEN Central Secretariat has the same status as the official versions. CEN members are the national standards organizations of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Irelan
16、d, Italy, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels CEN 1987 Copyright reserved to all CEN members Ref
17、 No. EN 2499:1987 E Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 17:26:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 2499:1987 BSI 01-2000 2 Brief history This European Standard has been prepared by the European Association of Aerospace Constructors (AECMA). After enquiries and votes ca
18、rried 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 Common CEN/CENELEC Rules, the following countries are bound
19、 to implement this European Standard: Belgium, France, Germany, Italy, Netherlands, Spain, United Kingdom. Contents Page Brief history2 0Introduction3 1Scope and field of application3 2Reference3 3Composition3 4Duplicates3 Figure4 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 17:26:19 GMT+0
20、0:00 2006, Uncontrolled Copy, (c) BSI EN 2499:1987 BSI 01-20003 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 carrie
21、r (e.g. paper). 1 Scope and field of application This standard specifies the deviations from ISO 51261) 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
22、the exchange of information in the aerospace industry. 2 Reference ISO 5126:1980, Micrographics Computer output microfiche (COM) Microfiche A6. 3 Composition 3.1 Reduction ratio The reduction ratio of 1 : 48 (nominal value) shall be used for filming. 3.2 Frame arrangement The arrangement corresponds
23、 to the arrangement of images No. 5 of ISO 5126: 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 arrang
24、ed in vertical image sequence (saw tooth form). The 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 (see Figure). 4 Duplicates 4.1 Film Diazo film is recommended for duplicates.
25、4.2 Image polarity Duplicates shall have light lines 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 wit
26、h a colour backed title area are not suitable for further duplication. 1) Consequently, the data not given in this standard is to be obtained from ISO 5126. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 17:26:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 2499:1987 4 BSI 01-2000 Figure Li
27、censed Copy: sheffieldun sheffieldun, na, Thu Nov 02 17:26:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 2499:1990 BSI 01-2000 National appendix A The United Kingdom participation in the preparation of this European Standard was entrusted by the Aerospace Standards Policy Committee (ACE/-) to
28、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 5126 referred to in clause 2 i
29、s BS 5644 “Specification for computer output microfiche (COM), A6 size”. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 17:26:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 2499:1990 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent nation
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38、hese details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel: 020 8996 7070. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 17:26:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI