1、EU ROPEAN STAN DAR 0 NORME EUROPEENNE EUROPISCHE NORM EN 2499 April 1987 UDC 629.7. 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
2、ion Aerospace series Computer output microfiche (COM) A6 microfiche -.D- Srie arospatiale Luft- und Raumfahrt Composition en sortie dordinateur sur microforme (COM) Microfiche A6 Com-Film (Computer Output Microfilm) Mikroplanfilm A6 This European Standard wasaccepted by CEN on 19136-08-1 2. CEN memb
3、ersare bound to comply with the requirements of GEN Internal Regulations which stipulate the conditioncfcx yiving thisEuiopean Standia!he statusof a nationalstandardwithout my slteri(tion. Up-to-date lists and bihliographical references concerning such national standards may be obtained on applicati
4、on 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 has t
5、he same status as the official versions. CEgmembers are the national standards organizations of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Ireland, Italy, Netherlands, Norway, Portugal, Spain, Sweden, Switzerlmd and United Kingdom. CEN European Committee for Standardization Coniitd
6、 Europen de Normalisation Europisches Komitee fr Normung Central Secretariat : Rue Brderode 2, 6-1 O00 Bruxelles CEN 1987Copyright reserved to all CEN members Ref. N! EN 2499 : 1987 E b CEN EN*2499 87 3404589 0002383 8 M EN 2499 Page 2 Brief history This draft European Standard hac been prepared by
7、the European Association of Aerospace Constructors (XECbA). 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 presentat
8、ion to C.E.N. According to the Common CEN/CENELEC Rules, following countries are bound to implement this European Standard: *$ .i. .P Belgium, France, Germany, Italy, Netherlands, Spain, United Kingdom. c CEN EN*2499 87 3409589 0002382 T W EN 2499 Page 3 O Introduction Computer output microfiche is
9、used for storing, distributing and filing data originating from data processing systems or procedures by directly transferring and recordhg the data on microfiche without intermediate carrier (e.g. paper). 1 Scope and field of application This standard specifies the deviations from IS0 5126) necessa
10、ry for aerospace application. microfiche in order to ensure uniform presentation of the microform for the exchange of informatiori in the aerospace industry. . It shall be applied for filming data (e.9. alpha-riumeric data processing outpiit) on AG .-ri 2 Reference SO 51 26.1980 Micrographics - Comp
11、uter output microfiche (COM) - Microfiche k6. 3 Composition 3.1 Reduction ratio The reduction ratio of 1 : 48 (nominal value) shall be used for filming. 3.2 Frame airangement The arrangement corresponds to the arrangement of images N. 5 of IS0 5126 : - 18 colurrips x 15 rows. = 270 frames Each frame
12、 shall be identified with the corresponding alpha-numeric coorainates. Indicatioli of the coordinates in the margins or at ?he bottom of the title area is optional. 3.3 Image sequence The images shall be rianged in verticcl image sequence (saw tooth form).The first microimage is located at the top l
13、eft corner of the grid. Subsequent microimages appear in sequence from top to bottom and form left to right, advancing by columns (see Figuro), 1) Consequently, the data not given in this standard is to be obtained fram IS0 5126. CEN EN*K2977 87 390L1589 0002383 1 I EN 2499 Page 4 4 Duplicires 4.1 F
14、ilm Ihzo film is recommended for duplicates. 4.2 linage polarity Dupiicates shall hap lislit lines and characters on i; drk background (negative - appParing image). 4.3 Generation . For the exchange of inforrnation between organisations, only duplicates (2nd generation) ruade directly from rhe camera fiim should be used. ! 4.4 Title area Duplicates with a coiour backed title area are not suitable for further duplication.
