Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

इंटरनेट मानक

“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda

“Invent a New India Using Knowledge”

“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru

“Step Out From the Old to the New”

“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan

“The Right to Information, The Right to Live”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam

“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 11408 (2006): Information technology - Unrecorded 12.7mm (0.5 in) wide magnetic tape ror information interchange- 32 ftpmm (800 ftpi) NRZ1,126 ftpmm ( 3 200 ft[o) phaseencoded and 356 ftpmm ( 9 042 ftpi), NRZ1 [LITD 16:Computer Hardware, Peripherals and Identification Cards]

IS 11408:2006lSO/lEC 1864:1992

Indian Standard

INFORMATION TECHNOLOGY — UNRECORDED12.7 mm (0.5 in) WIDE MAGNETIC TAPE FORINFORMATION INTERCHANGE — 32 ftpmm

(800 ftpi), NRZI, 126 ftpmm (3 200 ftpi) PHASEENCODED AND 356 ftpmm (9 042 ftpi), NRZI

( First Revision)

ICS 681.327.636

@ BIS 2006

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

~~y 2006 Price Group 7

Computer Hardware Sectional Committee, LTD 37

NATIONAL FOREWORD

This Indian Standard (First Revision) which is identical with lSO/tEC 1864 :1992 ‘Informationtechnology — Unrecorded 12,7 mm (0,5 in) wide magnetic tape for information interchange — 32 ftpmm(800 ftpi), NRZ1, 126 ftpmm (3 200 ftpi) phase encoded and 356 ftpmm (9 042 ftpi), NRZ1’ issuedby the International Organization for Standardization (ISO) and International ElectrotechnicalCommission ([EC) jointly, was adopted by the Bureau of ,Indian Standards on the recommendationsof the Computer -Hardware Sectional Committee and approval of the Electronics and InformationTechnology Division Council.

This standard was originally published in 1986 and was identical with lSO/lEC 1864:1984 and has nowbeen revised to align it with the latest lSO/lEC Publication.

The text of the lSO/lEC Standard has been approved as suitable for publication as an Indian Standardwithout deviations. Certain conventions are, however, not identical to those used in the Indian Standards.Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should beread as ‘Indian Standard’.

b) Comma ( , ) has been used as a decimal marker while in Indian Standards, the current practiceis to use a point ( . ) as the decimal marker.

In this adopted standard, reference appears to certain International Standards for which Indian Standardsalso exist. The corresponding Indian Standards which are to be substituted in their places are listedbelow along with their degree-of equivalence for the editions indicated:

International Standard

ISO 468:1982 Surface roughness —Parameters, their values and generalrules for specifying requirements

ISO 1863 : 1990 Informationprocessing — 9-track, 12,7 mm(0,5 in) wide magnetic tape forinformation interchange using NRZ1at 32 ftpmm (800 ftpi) — 32 cpmm(800 cpi)

lSO/lEC 3788 : 1990 Informationprocessing — 9-track, 12,7 mm(0,5 in) wide magnetic tape forinformation interchange using phaseencoding at 126 ftpmm (3 200 ftpi),63 cpmm (1 600 cpi)

ISO 5652 : 1984 Informationprocessing — 9-lrack, 12,7 mm(0.5 in) wide magnetic tape forinformation interchange — Formatand recording, using group codingat 246 cpmm (6 250 cpi)

Corresponding Indian Standard

Is 3073 : 1967 Assessment ofsurface roughness

Is 11409 : 2006 Informationprocessing — 9-track, 12.7 mm(0.5 in) wide magnetic tape forinformation interchange using NRZIat 32 ftpmm (800 ftpi) -32 cpmm(800 cpi)

Is 11410 : 2006 Informationprocessing — 9-track, 12.7 mm(0.5 in) wide magnetic tape forinformation interchange using phaseencoding at 126 ftpmm (3 200 ftpi),63 cpmm (1 600 cpi)

IS 11411 :1986 Specification for9-track, 12.7 mm wide magnetictape format and recording, usinggroup coding at 246 cpmm forinformation processing

Degree of Equivalence

Technically Equivalent

identical

do

do

( Continuedon thiticover)

IS 1148: ~WISOIIEC 18M :1992

Indian Standard

INFORMATION TECHNOLOGY — UNRECORDED

12.7 mm (0.5 in) WIDE MAGNETIC TAPE FORINFORMATION INTERCHANGE — 32 ftpmm

(800 ftpi), NRZI, 126 ftpmm (3 200 ftpi) PHASEENCODED AND 356 ftpmm (9 042 ftpi), NRZI

( First Revision)

1 Scope

This International Standard specifies the character-istics of 12,7 mm (0,5 in) wide magnetic tape withreel, to enable magnetic and mechanical inter-changeability of such tape between informationprocessing systems.

This International Standard applies solely to mag-netic tape for digital recording using the NRZImethod of recording at 32 Rpmm and 356 ftpmm(800 ttpi and 9042 Rpi) or the phase-encodedmethod of recording at 126 flpmm (3 200 ftpi) inwhich the direction of magnetization is nominallylongitudinal.

NOTE 1 Some numeric values in the.Sl andlor Imperialmeasurement system in this International Standard havebeen rounded off and therefore are consistent with, butnot exactly equal to, each other. Either system may beused, but the two should be neither intermixed nor re-converted. The original design was made using the lm-peri al measurement system.

2 Normative references

The following standards contain provisions which,through referenca in this tefi, constitute provisionsof this International Standard. At the time of publi-cation, the editions indicated were valid. All stan-dards are subject to revision, and parties toagreements based on this International Standardare encouraged to investigate the possibility of ap-plying the most recent editions of the standards in-dicated below. Members of IEC and ISO maintainregisters of currently valid International Standards.

ISO 209-1:1989, Wrought a/uminium and a/uminiumalloys — Chemical composition and forms of prod-ucts — Part 1: Chemical composition.

ISO 468:1982, Surface roughness – Parameters, theirvalues and genera/ rules for speci~ingrequirements.

ISO 1863:1990, Information processing – &track, 12,7mm (0,5 in) wide magnetic tape for informationinterchange using NRZ 1 at 32 ftpmm (8W ftpi) — 32cpmm (800 cpi).

lSO/lEC 3788:1990, /formation processing – 9-track,12,7 mm (0,5 in) wide magnetic tape for informationinterchange using phase encoding at 126 fipmm (32~ ffpi), 63 cpmm (1 600 cpi).

ISO 5652:1984, Information processing – 9-Track,12,7 mm (0.5 in) wide magnetic tape for informationinterchange — Format and recording, using groupcoding at 246 cpmm (6 250 cpi).

ISO 6098:1984, Information processing – Self-loadingcartridges for 12,7 mm (0.5 in) wide magnetic tape.

ASTM D 2000, Rubber products in automotive appli-cations, classification system for.

3 Deflnitlons

For the purposes of this International Siandard, thefollowing definitions apply.

3.1 magnetic tape: A tape that will accept and ret-ain the magnetic signals intended for input, outputand storage purposes on computers and associatedequipment.

3.2 Master Standard Reference Tape: A tape selec-ted as the standard for sig~al amplitude.

NOTE 2 A Master Standard Reference Tape has beenestablished at the US Nationa{ Institute of Standards and

1

Is 114M : amlSO/lEC 1884:1992

Twhnolgy (NIST) for the physical rmding densities of32 ftpmm (800 ftpi) and 126 ftpmm (3 200 ftpi).

A further Master Standard Refereme Tape has been es-tablished at the NIST for the physical rwording density

. of 356 ftpmm (9 W2 Rpi).

3.3 S-ndary Standard Reference Tape: A tape forwhich the magnetic characteristics are known andstated in relation to that of the Master StandardReference Tape. It is intended that these be used forcalibrating tertiary reference tapes for use in routinecalibration. See annex B.

NOTE 3 S=ondary Standard Reference Tapes areavailable from the NIST, Office of Standards ReferenceMaterials, Room 205, Building 202, National Institute ofStandards Technology, Gaithersburg, MD 20899, USA,under the following part numbers

SRM 3200 for 32 ftpmm (800 ftpi) and 126 ftpmm(3 200 ftpi)

SRM 6250 for 358 ftpmm (9 M2 ftpi)

3.4 Average Signal AmplWde: The average peak-t~peak value of the signal output to the read headwhen measured over a minimum of 76 mm (3,0 in)of tape.

3.5 Typical Field: In the plot of the Average SignalAmplitude against the recording field at the speci-fied physical recording density, it is the minimumfield that causes an Average Signal Amplitude equalto 95 ‘A of the maximum Average Signal Amplitude.

3.6 Reference Field: The typical field of the MasterStandard Reference Tape at the specified physicalrecording density.

3.7 Standard Reference Current The current thatproduces the Reference Field.

Traceability to the Standard Reference Current isprovided by the calibration factor(s) supplied witheach Secondav Standard Reference Tape.

3.8 Test R=ordlng Current The current that is ktimes the Standard Reference Current, where kequals:

2,0 to 2,2 at 32 ftpmm (800 ftpi)

1,75 to 1,85 at 126 ftpmm (3 200 ftpi)

1,35 to 1,45 at 356 flpmm (9 042 flpi)

3.9 Standard Reference Amplitude; SRA: The Aver-age Signal Amplitude from the Master StandardReference Tape when it is recorded with the appro-priate Test Recording Current at one of the specifiedphysical recording densities.

Traceability to-the Standard Reference Amplitude isprovided by the calibration factor(s) supplied witheach Secondary Standard Reference Tape.

3.10 reference edge: The edge furthest from anobserver when the tape is lying flat with the mag-netic surface uppermost and the direction of move-ment for recording is from Iefi to right.

3.11 In+on*t An operating condition in whioh themagnetic surface of a tape is in contact with a mag-netic head.

3.12 track: A longitudinal area on a tape alongwhich a series of magnetic signals may be recorded.

3.13 row: Nine transversely-related locations (onein each track) in which bits are recorded.

3.14 poaltlon of flux transition: That point whichexhibits the maximum free-space flux densitynormal to the tape surface.

3.15 physical recording densi~. The number of re-corded flux transitions per unit length of track(ftpmm or ftpi).

3.16 data densi~ The number of data charactersstored per unit length of tape (cpmm or cpi).

3.17 resistance per square: The surface resistanceof a square area of any size measured betweenelectrodes placed along two opposite sides of thesquare. The unit of measurement is the ohm.

3.18 oxide coating to brass and chrome: The re-sistance of the tape oxide coating to motion on brass(chrome).

3.19 oxide coating to tape back surface: The re-sistance of the tape oxide coating to motion on thetape back surface.

3.20 tape back surface to stainless steel: The re-sistance of the tape back surface to motion onstainless steel.

3.21 rubber to tape back surface: The resistance ofthe tape back surface to motion on rubber.

4 Environment

The conditions specified below refer to the ambientconditions in the test or computer room and not tothose within the tape drive equipment.

4.1 Testing environment

Unless otherwise stated, all measurements madeon a tape to check compliance with the require-ments of this International Standard and all tests

2

Is llW :2006lSOflEC lW : W92

prescribed for a tape in this International Standardshall be carried out under the environmental con-ditions of 23 “C * 2 “C (73 ‘F + 4 ‘F) and relativehumidity 40 YOto 60 ‘A, after at least 24 h of con-ditioning in the same environment.,

4.2 Operating environment

The operating temperature shall be within the range16 “C to 32 ‘C (60 ‘F to 90 ‘F) and the relative hu-midity 20 ‘/0 to 80 ‘/0. Operation near the extremesof these ranges can result in degraded performance.The wet bulb temperature shall not exceed 25 ‘C(78 “F).

4.3 Storage environment

During storage, it is recommended that the tapesare kept within the following conditions:

4.3.1 Unrecorded tape

temperature: 5 ‘C to 48 ‘C (40 ‘F to 120 ‘F)

relative humidity: 20 ‘/0 to 80 ‘/0

wet bulb temperature: not greater than(80 “F)

4.3.2 Recorded tape

temperature: 5 “C to 32 ‘C (40 ‘F to 90 ‘F)

relative humidity: 20 ‘/0 to 80 ‘A

wet bulb tem~erature: not areater than(80 “F) “

5 Characteristics

5.1 Material

of the tape

26 ‘C

26 ‘C

The tape shall consist of a base material (orientedpolyethylene terephthalate film or its equivalent)coated on one side with a slrong yet flexible layerof ferromagnetic material dispersed in a suitablebinder. If the tape is also coated on the rear surface,the coating shall be non-ferromagnetic.

5.2 Width

The width of the tape shall be 12,7 1$~ mm(0,500 ~$~ in).

5.3 Total tape thickness

The total tape thickness, at any point, shall be0,048 mm * 0,008 mm (0,001 9 in + 0,0003 in).

5.4 Base material thickness

The base material thickness shall be 0,038 mm(0,001 5 in) nominal.

5.5 Coating thtckness

The coating thickness shall not exceed 0,015 mm(0,000 6 in).

5.6 Length

The normal minimum length of tape is 732 m(2 400 ft) splice-free. ~ the length of the tape is lessthan 732 m (2 400 ft), the actual length shall bestated. Maximum tape length is limited by thickness,E -value (see 5.7), moment of inertia and reel di-mensions.

‘5.7 E vatue

T+e E value is the radial distance by which the reetflanges extend beyond the outermost layer of a tapewhich has been wound at a tension of 2 N to 3,6 N(7 ozf to 13 OZO on the specified reel. The minimumE value shall be 3,2 mm (0,125 in).

When the tape is used with a self-loading cartridge(see ISO 6098), the E value shall satisfy:

6,3 mm (0,25 in) < E < 15,9.mm (0,625 in)

5.8 Elastoplastic properties

The elastoplastic -properties of the tape -shall besuch that when the tape is subjected to a tension of30 N {108 ozft for a period of 3 min under any com-binatkn of temperature and relative humidity withinthe ranges of 10WC to 50 ‘C (50 ‘F to 122 “F) and20 YO to 80 YO relative humidity, the permanentelongation measured with negligible tension after asecond 3 min interval is less than 1,0 ‘/0.

5.9 Longttudlnal curvature

There shall be a minimum radius of curvature for theedge of the tape, defined and tested by allowing a1 m (36 in) length of the tape to unroll and assumeits natural curvature on a flat surface. The minimumradius shall be 33 m (108 ft). If measured over an arcof a circle, this corresponds to a deviation of3,8 mm (1/8 in) from a 1 m “(36 in) chord.

5.10 Tape wind

Tape shall be wound, with its magnetic surface to-ward the reel hub, in a clockwise direction; i.e. whenthe reel is viewed from the front, the loose end of thetape hangs from the right side of the reel. Tape shallbe wound wdh a tension of 2 N to 3,6 N (7 ozf to13 oz~ (see figure 2).

3

IS 11408:2006lSO/lEC 1864:1992

5.11 Magnetic properties

The magnetic properties of the tape are not definedhere by B-H loops or similar parameters, but are

. defined by the testing procedures given in 5.13 and5.15.

5.12 Test density \

For the purpose of testing tape in accordance withthis International Standard, the physical recordingdensity shall be 32 ftpmm, 126 ftpmm or 356 ftpmm(800 ftpi, 3200 ftpi or 9042 ftpi). The flux transitionsshall be uniformly spaced. The flux transition spac-ing and the track configuration shall conform toISO 1863, ISO 3788’ or ISO 5652 as appropriate.

5.13 Typical Field

The Typical Field ofwithin ~ 20 ‘/0 of therecording density

the tape under tist shall beReference Field for a physicalof 32 ftpmm (800 ftpi) or

126 ftpmrn (3 200 ~~) and within * 15 ?. of the Ref-erence Field for a physical recording density of356 ftpmm (9 042 ftpi).

5.14 Average Signal Amplitude

When read back on a system, each channel of whichhas been calibrated relative to the SRA, the AverageSignal Amplitude shall be within+.,$~” % of the SRAat 32 ftpmm (800 ftpl), within _,. /0 at 126 ftpmm(3 200 ftpi) and within .* 40 ‘A at 356 ftpmm(9 042 ftpi).

This test shall be conducted on the read-while-writepass for both tapes.

NOTE 4 It has been observed that the Average SignalAmplitude level at 356 ftpmm (9 042 ftpi) can vary alongthe length of tape. This effect is termed “tilt” and is thesubject of an investigation to determine its magnitude.Results indicate that a variation of 20 YOcan be expected.The effect of such variations is included in the specifiedtolerance on Average Signal Amplitudes.

5.15 Ease of erasure

When a tape has been recorded according to any ofthe conditions specified in 5.13 and then passedthrough a longitudinal unidirectional steady field of79500 A/m (1 000 Oe), the remaining Average Sig-nal Amplitude shall not exceed 4 ‘/0 of the SRA forthat density.

The erasure field shall be reasonably uniform, suchas that in the middle of a solemid.

5.16 Test for mlsslng pulses and extra pulses

These tests shall be Carried out in the in-contactcondition and over the entire tested area, whichshall extend from ‘0,2 m (8 in) before the BOT re-flective marker to 3,0 m (10 ft) beyond the EOT re-flective marker (see figure 1).

When performing the tests in 5.16.1 and 5.16.2, theoutput or resultant signal shall be measured on thesame relative pass for both th$ Master StandardReference Tape and the tape under test, i.e. read-while-write or read-on-first-pass-after-write. TheSRA shall be measured at the appropriate density.

5.16,1 Missing pulses

When a tape has been recorded on all tracks asspecified in 5.12 and 5.13, and is played back on asystem, each channel of which has been calibratedas

a)

b)

c)

In 5.14, a missing pulse snail De eltner:

at 32 ftpmm (800 ftpi), any signal from any trackhaving a base-tmpeak amplitude Iess’than 50 YOof half the SRA;

at 126 ffpmm (3 200 ftpi), any pair of consecutiveoutput pulses from any track together having apeak-to-peak amplitude less than 35 % of theSRA;

at 356 ftpmm (9 042 ftpi), any signal from anytrack having a base-to-peak amplitude less than35 ‘A of half the SRA;

‘5.16.2 Etira pulses

Following DC-erasure of the tape on the machineused for conducting the missing pulse test as de-scribed in 5.16.1, any signal from any track whenmeasured base-to-peak which exceeds 10 ‘A of halfthe SRA shall be an extra pulse.

5.16.3 Allowable number of missing pulses andextra pulses

The allowable number of missing pulses and of ex-tra pulses is not specified by this InternationalStandard, but is a matter for agreement betweeninterchange parties.

NOTE 5 It is considered impractical to specify thisnumber for the following reasons

a)

b)

the pe~formance of test equipment for magnetic tapeis not uniform but depends on such things as tapetension, head d~ign, and the method of guidanceemployed;

different machines and systems of programming varyin their ability to tolerate missing and extra pulses ontapes.

4

5.17 Reflective markers

Islla:mwlSOflEC 1-:1992

5.20 Resistance

Each reel of tape shall be furnished with two photo-reflective markers, each consisting of, or equivalentto, a transparent plastic base with a metallic (for

>example, vaporized aluminium) coating sandwichedbetween the base and a thin layer of low cold flowthermal setting adhesive.

Reflective markers shall be placed on the side of thetape which does not carry the magnetic surface, andthey shall be on opposite edges of the tape with thebeginning-of-tape reflective marker (BOT) on thereference edge.

Th-ewidth of the markers shall be 4,8 mm * 0,5 mm(0,19 in * 0,02 in).

The length of the markers shall be 28 mm * 5 mm(1,1 in * 0!2 in).

The thickness of the markers, measured afler theirapplication to the tape, shall be not greater than0,020 mm (0,000 8 in).

The beginning-of-tape reflective marker (BOT) shallbe placed 4,9 m * 0,6 m (16 fi ~ 2 ft) from the be-ginning of the tape and the endof-tape marker (EOT)shall be placed 7,6 ‘~~ m (25 ‘~~ ft) from the endof the tape and such that the tested area is at least720,6 m (2 363 ft) in length.

The distance from the outer edge of a marker to theadjacent edge of the tape shall be 0,8 mm max.(0,031 in max.) and the marker shall not protrudebeyond the edge of the tape.

The markers shall be free of wrinkles and excessiveadhesive.

FRQIRR \\ is deg\rab\e that the thinnest markers beemployed which perform satisfactorily in minimizing thed&tmt/on of the /ayers of tape adjacent to them.

5.18 Cupping

Cupping is the departure across the width of tapefrom a flat surface. The maximum cupping of a6,35 mm (0,25 in) long length of tape shall not ex-ceed 0,25 mm (0,010 in) when placed concave sidedown on a smooth, flat surface. The time betweencuttimg and the measurement should be 1 h.

5.19 Opacity

Opacity is a characteristic which limits the amountof transmission of light through the tape. The tapeopacity shall not be less than 95 ‘/0 over the wave-length range from 0,4 pm to 1,5pm (16 pin to59 pin).

The electrical resistance of the magnetic surfaceshall be within the range of 5 x 105 Q to 5 x 108 Q.

5.21 Reflectivity

5.21.1 Marker reflactt~

The photoreflective marker shall possess areflectivity of at least 90 ‘/0 compared to a referencestandard, at a 60” angle of incidence of light andover the range of wavelengths from 0,4 pm to1,5 pm (16 pin to 59 pin).

The reference standard shall be constructed from apiece of aluminium A1-Mg 1 Si Cu (see ISO 209-1)with a flat face dimension of 30 mm (1,2 in) by5 mm (0,20 in) with a surface @ughness R. (arith-metical mean -deviation) between 01008 ym(0,32 pin) and 0,016 pm (0,63 pin) (see ISO 468). Thestandard should be resurfaced periodically to pre-vent a reflectivity shift due to oxidation.

5.21.2 Tape backing refltitity

The tape backing shall possess a reflectivity not ex-ceeding 30 ‘/0 of that of the reference standard whenmeasured under the conditions specified In 5.21.1.

5.22 Dynamic frktlonal characterlstka

The force specified in 5.22.1.1, 5.22.2.1, 5.22.3.1 and5.22.4.1 shall be the sum of the forces exerted by the65 g (2,3 OZ) mass and the dynamic friction.

5.22,1 Oxide coating to brass and chrome

5.22,1.1 Requirement

The force shall be 1,28 N max. (4,6 ozf max.).

5.22.1.2 procedure

The sample shall be puiled at 50 mm (2 in) per min-ute over a brass (chrome) cylinder (9@degree wrap)of diameter 25 mm (1 in) with a 65 g (2,3 OZ) masson the other end of the tape, The force versus time(or force versus distance) shall be plotted. Particularattention should .be given to keeping the samplesclean and maintaining the brass (chrome) cylinderfinish [0,13 pm to 0,26pm (5 pin to 10 pin)peak-to-peak].

5.22,2 Oxide coating to tape back surface

5.22.2.1 Requirement

The force shall be 0,78 N min. (2,8 ozf min.).

5

IS 11408:2006!SO/lEC 1864:1992

5.22.2.2 Procedure

The oxide-coated surface of the sample shall bepulled at 50mm (2in)_per minute over a cylinder

, (90-degree wrap) of dhmeter 25 mm (1 in) coveredwith one layer of the same tape, back surface up. A65 g (2,3 OZ) mass shall be suspended on the freeend of the tape. The force versus time (or force ver-sus distance) shall be plotted.

5.22.3 Tape back surface to stainless steel

5.22.3.1 Requirement

The force shall be 0,83

5.22.3.2 Procedure

N max. (3,0 ozf max.).

The sample shall be pulled at 50 mm (2 in) per min-ute over a stainless steel cylinder (90-degree wrap)of diameter 25 mm (1 in) with a 65 g (2,3 OZ) masson the other end of the tape. The force versus time(or force versus distance) shall be plotted. Particularattention should be given to keeping the samplesclean and maintaining the stainless steel cylinderfinish [0,13 pm to 0,26pm (5 pin to 10 pin)peak-to-peak].

5,22.4 Rubber to tape back surface

5,22.4.1 Requirement

The force shall be 0,78 N min. (2,8 ozf min.).

5.22.4.2 Procedure

The sample shall be pulled at 50 mm (2 in) per min-ute over a rubber-coated cylinder (9@degree wrap)with a 65 g .(2,3 OZ) mass on the other end of thetape.

The cylinder construction shall consist of a stainlesssteel inner cylinder 25 mm (1 in) in diameter and18 mm (0,75 in) in length (a centre core convenientfor mounting is optional) to which a 5 mm (0,2 in)coating of rubber is vulcanized. This rubber shall betype BG830, in accordance with ASTM D 2000.

The force versus time (or force versus distance)shall be plotted.

6 Reel

6.1 Description

In figure 3, a reel in accordance with this inter-national Standard is shown for illustrative purposes.The reel shall comprise a hub and two flanges. Thefront flange shall exhibit a circular relieved area.The rear flange shall exhibit a circular groove for a

write-enable ring. All dimensions and tolerancesspecified in table 1 apply both to empty reels andreels wound with tape.

6.2 Construction

6.2.1 Cross-sectIon

Reels shall be constructed such, that any cross-section taken through the central axis of the reelconforms to the cross-section shown in figure 3. Thering groove may have a recess to accommodate thewrite-enable ring tab as an option. This recess shallnot interfere with normal tape transport operation.

6.2,2 Symmetry of reel

Reels shall not be symmetrical, the flanges differingfrom each other as to the presence or absence of arelieved area or the write-enable ring groove, whichshall be adjacent to the mounting pedestal for coF-rect machine operation.

‘6.2,3 Hub and flanges

Hub and flanges need not be integral, but may beseparate parts at the manufacturer’s discretion aslong as no relative movement between parts canoccur and all requirements of this InternationalStandard are met.

6.2.4 Outside surface of flanges

Bosses, ribs, or raised designs are permitted on theoutside surface of the flanges, provided that they donot extend beyond the cross-hatched envelope ofsection A-A shown in figure 3.

6.3 Deslgnatlon

The reel specified by this International Standardshall be designated by: Size 27.

6.4 Dimensions

6.4.1 Reference surface

The axial dimensions are referred to a referencesurface U.

This reference surface U shall be used for reelmounting. It is a circular surface defined by diam-eters A and D on the rear flange (see 6.4.2 and6.4.5.1).

6,4.2 Inside diameter of the hub

The inside diameter A of the hub shall be

93,68 ~$~~ mm (3,688 ~\&5 in)

6

6.4.3 Overall diameter of the flanges

The overall diameter B of the flanges shall be

. 266,70 ~~$~ mm (10,5 ~j~~~ in)

6,4.4 Outside diameter of the hub

The outside diameter C of the hub shall be

-130,18 mm (5,125 in)

The tolerance on this dimension shall be

In ranges N: + 0,20 mm (A 0,~8 in)

In range JW.* 0,13 mm (* 0,005 m)

6.4.5 Dimensions of the groove for the wtie-enablering

6.4.5.1 The inside diameter D of the groovebe

98,42 mm ~ 0,13 mm (3,875 in * 0,005 in)

shall

6.4.5.2 The outside diameter E of the groove shallbe

111,46 mm ~ 0,13 mm (4,388 in + 0,005 in)

6.4.5.3 The angle a of the wall of the groove withthe axis of the reel shall be

4° t 15’

6.4.5.4 The depth F of the groove shall be

6,35 +0,25_.o,m mm (0,25 ~$~ in)

6.4.6 Distances of the flange surfaces from thereference surface

The thickness of the flange portion of the reels maybe varied, but shall fall entirely within the cross-hatched envelopes defined by dimensions Jf, .~r, Kf,K, and M.

6,4.6.1 The distance J, of the inside surface of thefront flange from the reference surface U shall be

15,8 ~~~~mm (0,622 ~~%~in)

6,4.6.2 The distance Jr of the inside surface of therear flange from the reference surface U shall be

2,46 ~~~~ mm (0;097 ~~fi in)

IS 11408:2006lSO/IEC 1864:1992

6.4.6.3 The distance K, of the outside surface of thefront flange from the reference surface U shall be

21,54 mm max. (0,848 in max.)

6.4.6.4 The distance K, of the outside surface of therear flange from the reference surface U shall be

2,03 mm max. (0,080 in max.)

6.4.7 Relieved area of the front flange

6.4,7.1 The diameter 1. of the relieved area of thefront flange shall be

104,78 mm min. (4,125 in min.)

6,4.7.2 The distance M of the bottom surface of therelieved area from the reference sutiace U -shatl be

18,24 mm + 0,13 mm (0,718 in & 0,W5 in)

6.4,8 Relieved area of-the -outer surfaces of theflanges

-6,4,8,1 At their outer rim, the outside surfaces ofthe flanges shall be relieved over a length 7 of

4,00 mm min. (0,157 in min.)

6,4,8.2 The distance Sf of the surface of the frontflange within this relieved area from the referencesurface U shall be

19,12 mm max. (0,753 in max.)

6.4,8.3 The distance S, of the surface of the rearflange within this relieved area from the -referencesurface U shall be

‘0,76 mm max. (0,030 in max.)

6.4.8.4 The edges of the flanges shall be roundedand have the following radii:

inner edges: RI = 0,89 mm min. (0,035 in min.)

outer edges: RO= 0,38 mm min. (0,015 in min.)

6,4.9 Relations between dimensions

6.4.9.1 Relation between dimensions A and C

The outside cylindrical surface of the hub shall beconcentric with the bore of the hub within 0,50 mm(0,02 in) Total Indicator Reading (TIR).

7

IS 11408:2006lSO/lEC 1864:1992

6,4.9.2 Relation between dimension Canal the 6.7 Manufadurer’s reel identificationreference surface U

The manufacturer’s identification may be placed onWithin ranges N, the perpendicularity of the outside the reel.

. cytindricat surface and the reference surface U shattbe within 6.8 Interchange label

0,100 mm (0,004 in) A tabetting area or card hotder may be provided on

Within range W, it shall be within the front flange. Adhesive labels, if employed, shatlbe of a type which teave no residue when removed

0,065 mm (0,003 in) and their addition shatt not increase the dimensionof the flange beyond the cross-hatched envetope of

The nominat tength of ranges N shatl be section A-A shown in figure 3.

1,5 mm (0,06 in) 6.9 Write-enable ring

6.5 Other physical charaderlstlcs 6.9,1 Outer sutiace

6.5.1 Moment of Inertia When instatled in the write-enable ring groove, theouter surface of the write-enable ring shatt not

The moment of inertia of the tape and reel combinedprotrude above the mounting reference surface (U)

shalt not exceed 10,3 g.m2 (562 oz.in2). In general,within a radius of 54,03 mm (2,127 in).

this witt require a reel whose-moment of inefiia doesnot exceed 2,71 g.m2 (148 oz.in2). 6,9.2 Tab

6,5.2 Rigidity of the hubThe write-enabte ring shall have a tab to facilitateremoval from the groove.

Dimension A shall not be reduced to less than93,6 mm (3,685 in) when the reel is fully loaded with

6.9.3 Construction

tape wound at a constant tension of 3,6 N (13 029. Dimensions and materials used shalt be such thatthe write-enabte ring can be inserted and removed

6.6 Identification of ownership with reasonable effort and remain inserted duringnormat use. Furthermore, the ring shatl be con-

An identification area shalt be provided on the front strutted so as not to interfere with normal tapeflange of the reet for ownership identification. transport performance.

Is llW :2009lSO/lEC 1-:1992

.( o12,7mm-:,1 mm OSM -0,004 In)

\

kHubend

Testedarea 720,6m* (2 363tt -)

0,8mmma~(0.03~ max.]

lqll >---,\ll‘-:II

[

.-IIEOT

0,8max.{0,03mx.) IIIII

RetlMflve MTRet&encedge

- mmendma*es

1- 3m(Wttl J30.5m ~0 f~ I7,6m i 25 ttJw I 1-

4.9m*O#m(%ft*2tt)

0,W8 m * O,W mm(0,001 9In•0,0003 Iti

Figura 1 – Tap charahdstics

~ Ma~tlc emfnce

Flgurs 2 - Ta@ wlndlng

9

IS 11408:2006BO/lEC 1864:1992

I

Rmr flanm view

A-A x..

II

t I1

1 -1 l– -1 -1

1

He 0,100 mm(0,004Id

L u@0,~5 mm(0,003Id

B-r

Jr

Kt u

(Ttiera*~g envel~)

Figure 3 – Reel charactedstics

10

Is 11408:2008lSO/lEC 1884:1992

Tabla 1 - Raal dlmanslnn------ . . ---- . ..... ... .. ...

Dimensions in millimetres Dimensions in inches

Nominal Tolerance Symbol Nornlnal Tolerenm

93,68 +0,13–0,03 A 3,@8+O,m–0,003

266,70 +O,a-O,n B 10,5+0,01

130,18 (m* 0,20 c 5,125 (~ 1:008(w* 0,13 (w* 0,M5

98,42 * 0,13 D 3,875 * 0,005

111,46 * 0,13 E 4,388 * 0,005

‘6,35 +O,n-0,00 F 0,25+0,010-0,000

15,8 +O,M-0,19 rf 0,622+O,m-O,m

2,46 +0,13–O,w J, 0,097 .W,m-O,m

21,54 Maximum K~ 0,848 Maximum

2,03 Maximum K, 0,080 Maximum

104,78 Minimum L 4,125 Minimum

18,24 * 0,13 M 0,718 * 0,005

1,5 not applicable N 0,06 not applicable

0,38 Minimum & 0,015 Minimum

“0,89 Minimum RI 0,035 Minimum

0,76 Maximum v‘&r 0,030 Maximum

“19,12 Maximum v‘f 0,753 Maximum

4,00 Minimum r 0,157 Minimum

10,34 not applicable w 0,405 “not applicable

Angle in degrees

4° * 15’ a 4“ * 15’

11

IS 11408:2006lSO/lEC 1864:1992

Annex A

(normative)

Reels confoming to the first edition of this international Standard

The reels defined in the first edition (1975) of this d) The maximum distance Kr between the rearInternational Standard differ in certain aspects from flange outside surface and the mounting surfacethe reels defined in this edition. These are: is 2,03 mm (0,080 in) at all points and does not

need to be reduced to 0,76 mm (0,03 in) over thea) B = 266,7 mm & 0,51 mm (10,5 in * 0,020 in) distance T as now specified by Sr

b) R, and ROwere not specified.The new requirements are to enable self-loading

c) The maximum distance ~ (M+ Kf in the first cartridges to be used and are within the require-

edition) between the front flange outside surface ments of the first edition (1975).and mounting surface is 21,54 mm (0,848 in) atall points and does not need to be reduced to Reels conforming to the first edition are suitable for19,12 mm (0,753 in) over the distance T, as now data interchange provided that they are not usedspecified by S,. together with self-loading cartridges.

12

IS 11408:2006lSO/lEC 1864:1992

Annex B(normative)

Procedure for the use of an SRM magnetic tape

6.4 Stabilization of the test system

Switch on the test system and allow a minimum ofone hour for the temperature of the components tostabilize so that the amplifier gains will remain sta-ble during the following operations.

The test system shall remain switched on until alloperations have been completed.

6.2 Procedure for the calibration of thetest system

9.2.1 To minimise the use of the SRM tape, andthe risk of damage to it, test the system for correctoperation using a tape other than the SRM tape.

B.2.2 The SRM tape shall be bulk erased prior touse.

B.2.3 Load the SRM tape and make one forwardand one reverse pass at normal speed to re-tensionthe tape.

NOTE 7 An SRM tape should not be wound at highspeed.

B.2.4 Make a complete forward read-while-writepass with the SRM tape and plot the saturationcurve (see figure B.1), that is, the curve of AverageSignal Amplitude versus write current.

Writing shall commence at the beginning of thecalibrated portion of the SRMtape.

For an SRM 3200 tape, writing shall commence92 m (300 ft) after the BOT marker.

For an SRM 6250 tape, writing shall commence305 m (1 .000 ft) after the BOT marker.

Partial passes shall not be made with an SRM tape.

B.2.5 Rewind the SRM tape at normal speed.

B.2.6 Determine the maximum Average SignalAmplitude from the saturation curve.

B.2.7 Determine -/,. the minimum write current re-quired to give an Average Signal Amplitude equalto 95 ‘A of the value determined in B.2.6.

11 is the current required to produce on the testsystem the Typical Field for the particular SRM tape.

8.2.8 Multiply 11 by the current calibration factor,CC, provided with the SRM tape, to obtain 12(but seeannex C).

12 is the write current required to produce the Ref-erence Field on the test system. It is the StandardReferen- Current (see 3.7). The Reference Field isthe Typical Field of the Master Standard ReferenceTape (3,6).

B.2.9 Multiply 12 by the factor K to obtain 13, theTest Recording Current for the user’s test system.

For SRM 3200 used at a recording density of32 ftpmm (800 ftpi), K= 2,1.

For SRM 3200 used at a recording density of126 fipmm (3 200 ftpi), K= 1,8.

For SRM 6250 used at a recording density -of356 fipmm (9 042 ftpi), K= 1,4.

B.2.1O Determine the Average Signal AmplitudeA, produced by the SRM tape at the write currentla.

B.2.11 Multiply Al by the amplitude correctionfactor C,, provided with the SRM tape, to obtain AZ(but see annex C).

A2 is the SRA on the test system.

6.3 Procedure for calibrating a tehla~tape

B.3.1 The tediary tape shall be bulk erased priorto use.

B.3.2 Load the tertia~ tape and make one forwardand one reverse pass at the normal tape speed tore-tension the tape.

13

IS 11408:2006lSO/lEC 1864:1992

Al

\

Write~t

Figure B.1 – Saturation cume of SRM tape on user’s test system

Some types of tape give a significant rise in theoutput signal amplitude with usage. [f such a typeof tape is to be used as a tertia~ tape, additionalforward and reverse passes shall be made until therise in signal amplitude per pass is less than0,05 OA.

As a guide, an SRM tape-is subjected to 4G completepasses to EOT and back to BOT prior to calibration,

6.3.3 Make a complete forward read-while-writepass, ignoring at least the first 12,5 m (50 R) of tapewhere there could be a significant change in outputwith distance along the tape, and plot the saturationcurve.

6.3.4 Rewind the tertia~ tape at normal speed.

6.3.5 Determine the maximum Average SignalAmplitude.

B.3.6 Determine ltl, the minimum write current re-quired to give an Average Signal Amplitude equalto 95 ‘A of the value determined in B.3.5.

The current calibration factor for the tetiiary taperelative to the Master Standard Reference tape shallbe calculated from the ratio:

B.3.7 Determine At,, the Average Signal Amplit~deat the write current 13.

The amplitude calibration factor for the tertiary taperelative to the Master Standard Tape shall be cal-culated from the ratio:

NOTE 8 It may be desirable to re-run the SRM tape atthe conclusion of the above operations to verify the sta-bility of the test system, However, the SRM tape shouldnot be run more than necessary since its output signalamplitude will rise with usage.

14

IS 11408:2006lSO/lEC 1864:1992

Annex C

(informative)

Derivation of calibration factore CC and C.

SRM tapes supplied prior to the adoption, in 1989,of the procedure in annex B were not provided withcalibration factors C= and C=. Such SRM tapes wereprovided with saturation curves for the MasterStandard Reference Tape and for the particular SRMas measured on the NIST test system.

CC and Ca are derived from these curves as follows.

C.f Derivation of CC

-Cl.1 From the saturation curve for the MasterStandard Reference Tape determine i,, which is theminimum write current required on the NIST systemto give the amplitude units equal to 95 YO of themaximum amplitude units.

1, is the Standard Reference Current.

C.1.2 From the saturation curve for the SRM tapedetermine ft. which is the minimum write currentrequired on the NIST system to give the amplitudeunits equal to 95 ‘/0 of the maximum amplitude units.

The current lt is “that required to produce, on theNIST system, the Typical Field for the SRM tape.

C.1.3 Cc is the ratio

C.2 Derivation of C.

C.2.1 Multiply 1, by the value of K appropriate tothe physical recording density being used to give theTest Recording Current on-the NIST system.

C.2.2 From the saturation curve for the MasterStandard Reference Tape determine the SRA, whichis the amplitude at the Test Recording Current.

C.2.3 From the saturation curve for the SRM tape,determine the amplitude at the Test Recording Cur-rent.

C.2.4 Ca is the ratio

SRAoutput of the SRM at the Test Recording Current

15

( Continued from second cover)

The technical committee responsible for the preparation of this standard has reviewed the provisions of

the following International Standards and has decided that they are acceptable for use in conjunctionwith this sta-ndard:

International Standard

ISO 209-1 :1989

ISO 6098:1984

ASTM D 2000

Title

Wrought aluminium and aluminium alloys — Chemical composition and forms

of products — Part 1 : Chemical composition

Information processing — Self-loading cartridges for 12,7 mm (0,5 in) wide

magnetic tape

Rubber products in automotive applications, classification system for

i

Bureau of Indian Standards

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goods and attending to connected matters in the country.

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This Indian Standard has been developed from Doc : LTD 37 (1975).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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