1、BRITISH STANDARD BS EN 21864:1994 ISO/IEC 1864:1992 Implementation of EN 21864:1993 Information technology Unrecorded12,7mm (0.5in) wide magnetic tape for information interchange 32ftpmm (800 ftpi) NRZ1,126ftpmm (3200ftpi) phase encoded and356ftpmm (9042ftpi) NRZ1 The European Standard EN 21864:1993
2、 has the status of a British Standard UDC 681.327.636BS EN21864:1994 This British Standard was published under the authorityofthe StandardsBoardand comes into effect on 15June1994 BSI 01-2000 The following BSI reference relates to the work on this standard: Committee reference IST/4 Draft for commen
3、t 91/63785 DC ISBN 0 580 23178 X Cooperating organizations The European Committee for Electrotechnical Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: Austria Oesterreichisches Normungsinst
4、itut Belgium Institut belge de normalisation Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito, r.y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Iceland Technological Institute of Icelan
5、d Ireland National Standards Authority of Ireland Italy Ente Nazionale Italiano di Unificazione Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus da Qualidade Spain Asociacin Espaola de Normal
6、izacin y Certificacin Sweden Standardiseringskommissionen i Sverige Switzerland Association suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd. No. Date CommentsBS EN21864:1994 BSI 01-2000 i Contents Page Cooperating organizations Inside fron
7、t cover National foreword ii Foreword 2 Foreword iii Text of ISO/IEC 1864 1BS EN21864:1994 ii BSI 01-2000 National foreword This British Standard reproduces verbatim EN21864:1993 and implements it as the UK national standard. This British Standard is published under the direction of the Information
8、Systems Technology Standards Policy Committee whose Technical Committee IST/4 has the responsibility to: aid enquirers to understand the text; present to the responsible international committee any enquiries on interpretation, or proposals for change, and keep UK interests informed; monitor related
9、international and European developments and promulgate them in the UK. BS EN21864:1994 supersedes BS EN21864:1991, which is withdrawn. NOTEInternational and European Standards, as well as overseas standards, are available from Customer Services, Publications. BSI, Linford Wood, Milton Keynes, MK146L
10、E. 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 This document compris
11、es a front cover, an inside front cover, pagesi andii, theEN title page, page 2, the ISO/IEC title page, pages ii to iv, pages1 to13 anda 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 ins
12、ide front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN21864 November1993 UDC681.327.636 Supersedes EN21864:1991 Descriptors: Data processing, information interchange, magnetic tapes, virgin medium, characteristics, dimensions, interchangeability, codification English version Informatio
13、n technology Unrecorded12,7mm (0.5in) wide magnetic tape for information interchange 32ftpmm (800ftpi), NRZ1,126ftpmm (3200ftpi) phase encoded and356ftpmm (9042ftpi), NRZ1 (ISO/IEC1864:1992) Technologie de linformation Bande magntique vierge de12,7mm (0.5in) de large, pour lechange dinformation 32ft
14、pmm (800ftpi), NRZ1,126 ftpmm (3200ftpi) par codage de phase et 356ftpmm (9042ftpi), NRZ1 (ISO/IEC 1864:1992) Informationstechnik Unbeschriebenes12,7mm (0.5in) breites Magnetband fr den Datenaustausch bei32,126 und356 Flusswechsel/mm (800,3200 und9042 Flusswechel/in) (ISO/IEC 1864:1992) This Europea
15、n Standard was approved by CEN on1993-11-25. CEN members are bound to comply with the CEN/CENELEC 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
16、 such national standards may be obtained on application to the 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 langu
17、age and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and U
18、nitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1993 Copyright reserved to CEN members Ref. No. EN 21864:1993 EEN21864:1993 BSI 01-2000 2 Foreword On the proposal of the CE
19、N Central Secretariat, the Technical Board decided to submit the InternationalStandard, Information technology Unrecorded12,7mm (0.5in) wide magnetic tape for information interchange 32ftpmm (800ftpi), NRZ1,126ftpmm (3200ftpi) phase encoded and356ftpmm (9042ftpi), NRZ1 (ISO/IEC 1864:1992), to the fo
20、rmal vote. The result of the formal vote was positive. For the time being, this document exists only in English. 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 May1994, and conflicting national s
21、tandards shall be withdrawn at the latest by May1994. In accordance with the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,
22、 Portugal, Spain, Sweden, Switzerland and UnitedKingdom.ISO/IEC1864:1992(E) ii BSI 01-2000 Contents Page Foreword iii 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Environment 2 5 Characteristics of the tape 3 6 Reel 6 Annex A (normative) Reels conforming to the first edition of this Internat
23、ional Standard 11 Annex B (normative) Procedure for the use of an SRM magnetic tape 11 Annex C (informative) Derivation of calibration factors C cand C a 12 Figure 1 Tape characteristics 8 Figure 2 Tape winding 8 Figure 3 Reel characteristics 9 Figure B.1 Saturation curve of SRM tape on users test s
24、ystem 12 Table 1 Reel dimensions 10ISO/IEC1864:1992(E) BSI 01-2000 iii Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC p
25、articipate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governm
26、ental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC1. Draft International Standards adopted by the joint technical committee are circulated to national bodie
27、s for voting. Publication as an International Standard requires approval by at least75% of the national bodies casting a vote. International Standard ISO/IEC1864 was prepared by Joint Technical Committee ISO/IEC JTC1, Information technology, Sub-Committee SC11, Flexible magnetic media for digital da
28、ta interchange. This fourth edition cancels and replaces the third edition (ISO1864:1985), of which it constitutes a technical revision. Annex A andAnnex B form an integral part of this International Standard. Annex C is for information only.iv blankISO/IEC1864:1992(E) BSI 01-2000 1 1 Scope This Int
29、ernational Standard specifies the characteristics of12,7mm (0,5in) wide magnetic tape with reel, to enable magnetic and mechanical interchangeability of such tape between information processing systems. This International Standard applies solely to magnetic tape for digital recording using the NRZ1
30、method of recording at32ftpmm and356ftpmm (800ftpi and9042ftpi) or the phase-encoded method of recording at126ftpmm (3200ftpi) in which the direction of magnetization is nominally longitudinal. NOTE 1Some numeric values in the SI and/or Imperial measurement system in this International Standard have
31、 been rounded off and therefore are consistent with, but not exactly equal to, each other. Either system may be used, but the two should be neither intermixed nor reconverted. The original design was made using the Imperial measurement system. 2 Normative references The following standards contain p
32、rovisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate th
33、e possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 209-1:1989, Wrought aluminium and aluminium alloys Chemical composition and forms of products Part 1: Chemical composition. I
34、SO 468:1982, Surface roughness Parameters, their values and general rules for specifying requirements. ISO 1863:1990, Information processing 9-track,12,7mm (0,5in) wide magnetic tape for information interchange using NRZ1 at32ftpmm (800 ftpi) 32 cpmm (800 cpi). ISO/IEC 3788:1990, Information process
35、ing 9-track,12,7mm (0,5in) wide magnetic tape for information interchange using phase encoding at 126 ftpmm (3200 ftpi),63 cpmm (1600 cpi). ISO 5652:1984, Information processing 9-Track,12,7mm (0.5in) wide magnetic tape for information interchange Format and recording, using group coding at246cpmm (
36、6250 cpi). ISO 6098:1984, Information processing Self-loading cartridges for12,7mm (0.5in) wide magnetic tape. ASTM D 2000, Rubber products in automotive applications, classification system for. 3 Definitions For the purposes of this International Standard, the following definitions apply. 3.1 magne
37、tic tape a tape that will accept and retain the magnetic signals intended for input, output and storage purposes on computers and associated equipment 3.2 master standard reference tape a tape selected as the standard for signal amplitude NOTE 2A Master Standard Reference Tape has been established a
38、t the US National Institute of Standards and Technology (NIST) for the physical recording densities of32ftpmm (800ftpi) and126ftpmm (3200ftpi). a further Master Standard Reference Tape has been established at the NIST for the physical recording density of356ftpmm (9042ftpi) 3.3 secondary standard re
39、ference tape a tape for which the magnetic characteristics are known and stated in relation to that of the Master Standard Reference Tape. It is intended that these be used for calibrating tertiary reference tapes for use in routine calibration. SeeAnnex B NOTE 3Secondary Standard Reference Tapes ar
40、e available from the NIST, Office of Standards Reference Materials, Room205, Building202, National Institute of Standards Technology, Gaithersburg, MD20899, USA, under the following part numbers: SRM 3200 for32ftpmm (800ftpi) and126ftpmm (3200ftpi) SRM 6250 for356ftpmm (9042ftpi) 3.4 average signal
41、amplitude the average peak-to-peak value of the signal output to the read head when measured over a minimum of76mm (3,0in) of tape 3.5 typical field in the plot of the Average Signal Amplitude against the recording field at the specified physical recording density, it is the minimum field that cause
42、s an Average Signal Amplitude equal to95% of the maximum Average Signal Amplitude 3.6 reference field the typical field of the Master Standard Reference Tape at the specified physical recording densityISO/IEC1864:1992(E) 2 BSI 01-2000 3.7 standard reference current the current that produces the Refe
43、rence Field traceability to the Standard Reference Current is provided by the calibration factor(s) supplied with each Secondary Standard Reference Tape 3.8 test recording current the current that is k times the Standard Reference Current, where k equals: 2,0 to 2,2 at 32 ftpmm (800 ftpi) 1,75 to 1,
44、85 at 126 ftpmm (3200 ftpi) 1,35 to 1,45 at 356 ftpmm (9042ftpi) 3.9 standard reference amplitude; SRA the Average Signal Amplitude from the Master Standard Reference Tape when it is recorded with the appropriate Test Recording Current at one of the specified physical recording densities traceabilit
45、y to the Standard Reference Amplitude is provided by the calibration factor(s) supplied with each Secondary Standard Reference Tape 3.10 reference edge the edge furthest from an observer when the tape is lying flat with the magnetic surface uppermost and the direction of movement for recording is fr
46、om left to right 3.11 in-contact an operating condition in which the magnetic surface of a tape is in contact with a magnetic head 3.12 track a longitudinal area on a tape along which a series of magnetic signals may be recorded 3.13 row nine transversely-related locations (one in each track) in whi
47、ch bits are recorded 3.14 position of flux transition that point which exhibits the maximum free-space flux density normal to the tape surface 3.15 physical recording density the number of recorded flux transitions per unit length of track (ftpmm or ftpi) 3.16 data density the number of data charact
48、ers stored per unit length of tape (cpmm or cpi) 3.17 resistance per square the surface resistance of a square area of any size measured between electrodes placed along two opposite sides of the square. The unit of measurement is the ohm 3.18 oxide coating to brass and chrome the resistance of the t
49、ape oxide coating to motion on brass (chrome) 3.19 oxide coating to tape back surface the resistance of the tape oxide coating to motion on the tape back surface 3.20 tape back surface to stainless steel the resistance of the tape back surface to motion on stainless steel 3.21 rubber to tape back surface the resistance of the tape back surface to motion on rubber 4 Environment The conditions specified below refer to the ambient conditions in the test or computer room and not to those within the tape drive equi
