1、ANSI INCITS 40-1993 (R2003)(formerly ANSI X3.40-1993 (R1998)for Information Systems Unrecorded Magnetic Tapefor Information Interchange(9-Track 800 CPI, NRZI; 1600 CPI, PE;and 6250 CPI, GCR)Approved July 19, 1993American National Standards Institute, Inc.SecretariatComputer and Business Equipment Ma
2、nufacturers AssociationAmerican National Standardfor Information Systems Unrecorded Magnetic Tapefor Information Interchange(9-Track 800 CPI, NRZI; 1600 CPI, PE;and 6250 CPI, GCR)ANSIX3.40-1993Revision ofANSI X3.40-1983AmericanNationalStandardApproval of an American National Standard requires review
3、 by ANSI that therequirements for due process, consensus, and other criteria for approval havebeen met by the standards developer.Consensus is established when, in the judgment of the ANSI Board of StandardsReview, substantial agreement has been reached by directly and materiallyaffected interests.
4、Substantial agreement means much more than a simplemajority, but not necessarily unanimity. Consensus requires that all views andobjections be considered, and that a concerted effort be made toward theirresolution.The use of American National Standards is completely voluntary; their existencedoes no
5、t in any respect preclude anyone, whether he has approved the standardsor not, from manufacturing, marketing, purchasing, or using products, processes,or procedures not conforming to the standards.The American National Standards Institute does not develop standards and will inno circumstances give a
6、n interpretation of any American National Standard.Moreover, no person shall have the right or authority to issue an interpretation ofan American National Standard in the name of the American National StandardsInstitute. Requests for interpretations should be addressed to the secretariat orsponsor w
7、hose name appears on the title page of this standard.CAUTION NOTICE: This American National Standard may be revised orwithdrawn at any time. The procedures of the American National StandardsInstitute require that action be taken periodically to reaffirm, revise, or withdrawthis standard. Purchasers
8、of American National Standards may receive currentinformation on all standards by calling or writing the American National StandardsInstitute.Published byAmerican National Standards Institute11 West 42nd Street, New York, New York 10036Copyright 1993 by Information Technology Industry Council (ITI)A
9、ll rights reserved.No part of this publication may be reproduced in anyform, in an electronic retrieval system or otherwise,without prior written permission of ITI, 1250 Eye Street NW,Washington, DC 20005.Printed in the United States of AmericaContentsPageiForeword .iii1 Scope and purpose.11.1 Scope
10、 11.2 Purpose .11.3 Conformance .22 Normative reference .23 Definitions24 General requirements .34.1 Material .34.2 Operation, storage, and test environments 34.3 Control devices and attachments 34.4 Tape wind 55 Tape physical requirements 55.1 Dimensions55.2 E value 55.3 Tensile yield force 55.4 Ta
11、pe integrity failure.55.5 Dynamic frictional characteristics65.6 Cupping .75.7 Residual elongation75.8 Curvature.75.9 Electrical resistance .85.10 Moment of inertia (full reel).85.11 Opacity85.12 Abrasivity.105.13 Inhibitor tape105.14 Tape/tape drive interface105.15 Peel adhesion 105.16 Back surface
12、 reflectivity105.17 Stiffness 116 Tape magnetic requirements .116.1 Output .116.2 Dropout (signal) .11ii6.3 Drop-in (noise) .126.4 Ease of erasure127 Tape reel requirements .127.1 Reel profile 127.2 Dimension M 127.3 Dimension limits.127.4 Flange envelope.127.5 Hub and flange relation.127.6 Bosses,
13、ribs, or raised designs137.7 Reel material137.8 Reel symmetry .137.9 Hub concentricity137.10 Write-enable ring groove dimension137.11 Dimension A and C limits137.12 Moment of inertia .13Table1 Tape reel envelope dimensions and angles14Figures1 Usable recording area 42 Applications of strip electrode
14、s to magnetic tape specimens.93 Circuit for measuring specimen resistance.94 Tape reel15AnnexA Bibliography .16PageiiiForewordThis standard, which is a revision of American National Standard forInformation systems Unrecorded magnetic tape for information inter-change (9-Track 200 and 800 CPI, NRZI;
15、1600 CPI, PE; and 6250 CPI,GCR), ANSI X3.40-1983, presents the minimum requirements for the physi-cal and magnetic interchangeability for 1/2-inch-wide magnetic tape andreels to be used for information processing systems, communication sys-tems, and associated equipment utilizing American National S
16、tandard forInformation systems Coded character sets 7-bit american national stan-dard code for information interchange (7-bit ASCII), ANSI X3.4-1986. Thisstandard deals solely with magnetic tape for digital recording and supportsand complements related American National Standards on recorded mag-net
17、ic tape for information interchange, for recording at 800 characters perinch (CPI) using nonreturn-to-zero change on ones (NRZI) recording tech-niques, at 1600 characters per inch using phase-encoded (PE) recordingtechniques, and at 6250 characters per inch using group-coded recording(GCR) technique
18、s.Technical Committee X3B5 on Digital Magnetic Tape, which developed thisstandard, consisted of a number of experienced and qualified specialistson the recording of digital information on magnetic tape. This standardincorporates suggestions for improvement and corrections to the textbrought to the a
19、ttention of the committee since the last revision was pub-lished. In the development of this standard, careful consideration wasgiven to current practices, existing equipment and supplies, and the broad-est possible acceptance, and to providing a basis for future improvement inthe use of the medium.
20、 This standard was approved as an American National Standard by ANSI onJuly 19, 1993.This standard contains one informative annex, which is not considered partof the standard.Requests for interpretation, suggestions for improvement or addenda, ordefect reports are welcome. They should be sent to the
21、 X3 Secretariat,Computer and Business Equipment Manufacturers Association, 1250 EyeStreet, NW, Suite 200, Washington, DC 20005.This standard was processed and approved for submittal to ANSI byAccredited Standards Committee on Information Processing Systems, X3.Committee approval of the standard does
22、 not necessarily imply that allcommittee members voted for its approval. At the time it approved thisstandard, the X3 Committee had the following members:James D. Converse, ChairmanDonald C. Loughry, Vice-ChairmanJoanne Flanagan, Administrative SecretaryOrganization Represented Name of Representativ
23、eAmerican Nuclear SocietyGeraldine C. MainSally Hartzell (Alt.)AMP IncorporatedEdward R. KellyCharles Brill (Alt.)AT AmericanNational Standard recorded magnetic tape forinformation interchange (1600 CPl, PE), ANSIX3.39-1986; and American National Standardrecorded magnetic tape for information inter-
24、change (6250 CPl, group-coded recording),ANSl X3.54-1986.1.2 PurposeThis standard defines the requirements andsupporting test methods necessary to ensureinterchange at acceptable performance levels.It is distinct from a specification in that it delin-eates a minimum of restrictions consistent withco
25、mpatibility in interchange transactions.The performance levels contained in this stan-dard represent the minimum acceptable levelsof performance for interchange purposes.They therefore represent the performance lev-els that the interchanged items should meetor surpass during their useful life and th
26、usdefine end-of-life criteria for interchange pur-poses. The performance levels in this stan-dard are not intended to be employed as sub-stitutes for purchase specifications.Wherever feasible, quantitative performancelevels that shall be met or exceeded in orderto comply with this standard are given
27、. In allcases, including those in which quantitativelimits for requirements falling within the scopeof this standard are not stated but left toagreement between interchange parties, stan-dard test methods and measurement proce-dures shall be used to determine such limits.U.S. customary units are the
28、 original dimen-sions in this standard. Conversions of toler-anced dimensions from customary U.S. engi-neering units (similar to British Imperial Units)and centimeter-gram-second electromagneticunits (cgs-emu). Conversion of these units tothe International System of Units units (SI)has been incorpor
29、ated in this standardaccording to Method A as described inAmerican National Standard Metric practice,ANSl/lEEE 268-1982, and in International1American National Standardfor Information Systems Unrecorded Magnetic Tapefor Information Interchange(9-Track 800 CPI, NRZI; 1600 CPI, PE;and 6250 CPI, GCR)AM
30、ERICAN NATIONAL STANDARD ANSI X3.40-19933.4 physical recording density: The num-ber of recorded flux transitions per unit lengthof track, e.g., flux transitions per inch (ftpi),flux transitions per millimeter (ftpmm).3.5 data density: The number of data char-acters stored per unit length of tape, e.
31、g.,characters per inch (cpi), characters per mil-limeter (cpmm).3.6 amplitude reference tape: The ampli-tude reference tape used to establish thestandard reference amplitude when it isrecorded with continuous ONEs at the densityunder consideration (NIST AmplitudeReference Tapes SRM 3200 and SRM6250)
32、.NOTE A master standard amplitude referencetape has been established at the NationalInstitute of Standards and Technology (NIST) forthe physical recording densities of 800 ftpi (32ftpmm) and 3200 ftpi (126 ftpmm). Secondaryamplitude reference tapes are available fromNIST under the part number SRM 32
33、00. A master standard amplitude reference tape hasbeen established at the NIST for the physicalrecording density of 9042 ftpi (356 ftpmm).Secondary amplitude reference tapes are avail-able from NIST under the part number SRM 6250. For ordering information, please contact Officeof Standard Reference
34、Materials, Room 205,Building 202, National Institute of Standards andTechnology, Gaithersburg, MD 20899.3.7 standard reference current: For anyspecified recording density, the standard ref-erence current (Ir) is the minimum currentapplied to the amplitude reference tape thatcauses an output signal a
35、mplitude equal to95% of the maximum output signal.3.8 standard measurement current: Forthe amplitude reference tape, the standardmeasurement current (Im) and the standardreference current (Ir) at the various recordingdensities, in flux transitions per inch (ftpi) andflux transitions per millimeter (
36、ftpmm), shallbe as given in the following table:Recording density ratio nftpi ftpmm Im/Ir800 32 2.0 to 2.23200 126 1.75 to 1.859042 356 1.3 to 1.53.9 standard reference amplitude: Theaverage peak-to-peak output signal amplitudederived from the amplitude reference tapeStandard for Toleranced dimensio
37、ns Conversion from inches into millimetres andvice versa, ISO 370-1975. Method A, asdescribed in ANSl/lEEE 268-1982, should beused to achieve economy unless a require-ment for absolute assurance of fit justifies useof Method B. In the national standards of ISOmember bodies, additional rounding may b
38、edone to produce “preferred” values. Thesevalues should lie within or close to the originaltolerance.Except as indicated, interchange parties com-plying with the applicable standards should beable to achieve compatibility without the needfor additional exchange of technical information.1.3 Conforman
39、ceA 1/2-inch-wide unrecorded magnetic tapeconforms to this standard if it satisfies allmandatory requirements of this standard.2 Normative referenceThe following standard contains provisionswhich, through reference in this text, consti-tute provisions of this American NationalStandard. At the time o
40、f publication, the edi-tions indicated were valid. All standards aresubject to revision, and parties to agreementbased on this American National Standard areencouraged to investigate the possibility ofapplying the most recent editions of the stan-dards indicated below.ANSI X3.4-1986, Information sys
41、tems Coded character sets 7-bit american nation-al standard code for information interchange(7-bit ASCII)3 Definitions3.1 back surface: The surface of the tapeopposite the magnetic coating.3.2 beginning-of-tape (BOT) marker: Aphotoreflective marker placed on the tape forthe purpose of indicating the
42、 beginning of therecording area.3.3 end-of-tape (EOT) marker: A photore-flective marker placed on the tape for the pur-pose of indicating the end of the recordingarea.ANSI X3.40-19932ANSI X3.40-1993when it is recorded at the standard measure-ment current on the NIST measurement sys-tem at the densit
43、y under consideration.4 General requirements4.1 MaterialThe tape shall consist of a base material (ori-ented polyethylene terephthalate film or itsequivalent), coated on one side with a strong,yet flexible, layer of ferromagnetic materialdispersed in a suitable binder. The back sur-face shall be equ
44、ivalent to polyethyleneterephthalate in performance. If the tape iscoated on the back surface, the coating shallbe nonferromagnetic.4.2 Operation, storage, and test environ-ments4.2.1 OperationThe operating temperature shall be within therange 60F to 90F (16C to 32C), and therelative humidity (RH) 2
45、0% to 80%. The wet-bulb reading shall not exceed 78F (25C).The temperature and humidity range of 65Fto 75F (18C to 24C) and 40% to 60% RH isrecommended for optimum performance.Operation outside these ranges may result indegraded performance.4.2.2 Storage4.2.2.1 Unrecorded tapeThe storage temperature
46、 shall be within therange 40F to 120F (5C to 48C) and therelative humidity 20% to 80%. The wet-bulbreading shall not exceed 80F (26C).4.2.2.2 Recorded tapeThe storage environment shall be the same asfor unrecorded tape except that the maximumstorage temperature is 90F (32C).4.2.3 TestUnless otherwis
47、e stated, all measurementsshall be performed under the following ambi-ent conditions after the tape to be tested hasbeen subjected to these conditions for at least24 hours: temperature: 73F 5F (23C 2C);relative humidity: 50% 10%.4.3 Control devices and attachments4.3.1 Photoreflective markersEach re
48、el of tape shall be furnished with tworeflective markers, consisting of (or equivalentto) a transparent plastic base with a vaporizedaluminum coating sandwiched between thebase and a thin layer of low-cold-flow adhe-sive. Dimensions and placement of the reflec-tive markers shall be as shown in figur
49、e 1.4.3.2 Marker reflectivity4.3.2.1 DefinitionThe percent reflectivity possessed by a reflec-tive photosense marker, compared to a refer-ence, at an angle of incidence of light of 60degrees.4.3.2.2 RequirementThe photoreflective marker shall have at least90% of the reflectivity of the reference.4.3.2.3 ProcedureThe test procedure for marker reflectivity shallbe as follows:a) Provide a reflectivity reference of 6061-T6 aluminum with a flat dimension of 1.1 in 0.2 in (28 mm 5 mm) by 0.19 in 0.02in (4.8 mm 0.5 mm) with a s
