Bsi bs en 21864 1994 (2000) iso iec 1864 1992

BRITISH STANDARD BS EN 21864 1994 ISO/IEC 1864 1992 Implementation of EN 21864 1993 Information technology — Unrecorded 12,7 mm (0 5 in) wide magnetic tape for information interchange — 32 ftpmm (800[.]

This British Stan ard was

publshed u der the

The folowing BSI reference

relates to the work on this

stan ard:

Commite reference IST/ 4

Draft for comment 9 /63 8 DC

ISBN 0 5 0 2 1 8 X

The European Commit e for Electrotechnical Stand rdization ( CEN), under

whose superv ision this European Stand rd was prep red, comprises the

national stand rds org anizations of the folowing cou tries:

Austria Oester eichis hes Normu g sinstitut

Belg ium Institut belg e de normalsation

Finland Suomen Stand rdisoimisl ito, r.y

France Association fançaise de normal sation

Germany Deuts hes Institut für Normu g e.V

Gre ce Hel enic Org anization for Stand rdization

I eland Tech olog ical Institute of I eland

I eland National Stand rds Authority of I eland

Italy Ente Nazionale Italano di Unificazione

Luxembourg Inspection du Trav ai et des Mines

Netherlands Nederlands Normalsatie-nstitu t

Portug al Instituto Portug uès d Quald de

Sp in Asociación Esp ñola de Normal zación y Certificación

Sweden Stand rdisering skommis ionen i Sv erig e

Switz rland Association suis e de normal sation

United King dom British Stand rds Institution

Am endm ents is ued sinc publ cation

National foreword

This British Stand rd reproduces v erb tim EN2 8 4:19 3 and implements it as

the UK national stand rd

This British Stand rd is publ shed u der the direction of the Information

Sy stems Tech olog y Stand rds Pol cy Commit e whose Tech ical Commit e

IST/ 4 has the responsibi ty to:

— aid enquirer to u der tand the text;

— present to the responsible international commit e any enquiries on

interpretation, or proposals for chang e, and ke p UK interests informed;

— monitor related international and European dev elopments and promulg ate

them in the UK

BS EN2 8 4:19 4 super edes BS EN2 8 4:19 1, which is withdrawn

NOT International an Euro e n Stan ards, as wel as o er e s stan ards,are a aia le fom

Customer Services, Publcations.BSI, Linford W ood, Miton Ke nes,MK1 6L

A British Stand rd do s not purport to include al the neces ary prov isions of a

contract User of British Stand rds are responsible for their cor ect a pl cation

Com pl anc with a British Standard do s not of itselfc nfer im munity

f om leg al obl g ations

Summ ary of pag es

This document comprises a font cov er, an inside f ont cov er, p g es i andi,

theEN title p g e, p g e 2, the ISO/ IEC title p ge, p g es i to iv , p g es1 to13

anda b ck cov er

This stand rd has be n up ated ( se cop rig ht d te) and ma hav e ha

amendments incorporated.This wi be indicated in the amendment ta le on the

inside f ont cov er

NORME EUROPÉENNE

Novemb r 1 9

Des riptor : Data proces ing , information interhang e, ma netic ta es, v irgin medium, characteristic , dimensions,

inter hang a i ty, codification

Eng lish ver ion

( ISO/ IEC 18 4:1 9 )

Technolog ie de l’information — Bande

mag nétique vierg e de1 ,7 mm ( 0.5in)de larg e,

pour l’echang e d’information —

Unb s hrie enes 1 ,7mm ( 0.5 in) breites

Mag netband für den

Datenaustaus h b i3 , 1 6 und3 6

Flus wechsel/ mm ( 80 , 320 und9042

Flus wechel/ in)

( ISO/ IEC 18 4:19 2)

This European Stand rd was a prov ed b CEN on19 3-1 -25 CEN member

are bou d to comply with the CEN/ CENELEC Internal Reg ulations which

stipulate the conditions for g iv ing this European Stand rd the status of a

national stand rd without any alteration

Up-to-d te lsts and bibl og ra hical references concerning such national

stand rds ma be obtained on a plcation to the Central Sec etariat or to any

CEN member

This European Stand rd exists in thre oficial v er ions ( Eng lish, French,

German) A v er ion in any other lang uag e ma e b translation u der the

responsibi ity of a CEN member into its own lang uag e and notified to the

Central Sec etariat has the same status as the oficial v er ions

CEN member are the national stand rds bodies of Austria, Belg ium,

Denmark, Finland, France, Germany , Gre ce, I eland, I eland, Italy ,

Luxembourg , Netherlands, Norway , Portug al, Sp in,Sweden, Switz rland and

UnitedKing dom

European Commit e for Stand rdization

Comité Europé n de Normalsation

Europ is hes Komite für Normu g

Central Se retariat: rue de Stas art 3 , B- 10 0 Brus els

©19 3 Copy rig ht reserv ed to CEN member

Ref No EN 2 8 4:19 3 E

For word

On the proposal of the CEN Central Sec etariat, the

Tech ical Board decided to submit the

InternationalStand rd, Infr ma tion te hnology —

Unr ecor d ed12,7mm (0.5in) wid e ma gnetc ta pe fr

inf r ma tion inter cha nge —32ftpmm (800ftpi) ,

NR Z1,12 ftpmm (3200ftpi pha se encod ed

a nd3 6ftpmm (9042ftpi) , NR Z1

( ISO/IEC 18 4:19 2), to the formal v ote The result

of the formal v ote was positiv e

For the time being , this document exists only in

Eng lish

This European Stand rd shal be g iv en the status of

a national stand rd, either b publ cation of an

identical text or b endor ement, at the latest b

Ma 19 4, and conflcting national stand rds shal

be withdrawn at the latest b Ma 19 4

In ac ord nce with the CEN/CENELEC Internal

Reg ulations, the fol owing cou tries are bou d to

implement this European Stand rd: Austria,

Belg ium, Denmark, Finland, France, Germany ,

Gre ce, I eland, I eland, Italy , Luxembourg ,

Netherlands, Norway , Portug al, Sp in, Sweden,

Switz rland and UnitedKing dom

Annex B ( normativ e) Procedure for the use of an SRM mag netic ta e 1

Annex C ( informativ e) Deriv ation of calbration factor C

cand C

a

1

Fig ure B.1 — Saturation curv e of SRM ta e on user’s test sy stem 1

For word

ISO ( the International Org anization for Stand rdization) and IEC

( the International Electrotech ical Commis ion) form the specialz d sy stem for

worldwide stand rdization National bodies that are member of ISO or IEC

p rticip te in the dev elopment of International Stand rds throug h tech ical

commit e s esta l shed b the respectiv e org anization to deal with p rticular

fields of tech ical activ ity ISO and IEC technical commit e s cola orate in

fields of mutual interest Other international org anizations, g ov ernmental and

non-g ov ernmental, in laison with ISO and IEC, also take p rt in the work

In the field of information tech olog y , ISO and IEC hav e esta lshed a joint

tech ical commit e , ISO/ IEC JTC1 Draft International Stand rds a opted b

the joint technical commit e are cir ulated to national bodies for v oting

Publ cation as an International Stand rd requires a prov al b at least7 % of

the national bodies casting a v ote

International Stand rd ISO/ IEC18 4 was prep red b Joint Tech ical

Commit e ISO/IEC JTC1, Inf r ma tion te h ology, S b-Commit e SC1 ,

Flexible ma gnetc med ia f r d igia l d a ta inter cha nge

This fourth edition cancels and replaces the third edition ( ISO18 4:19 5), of

which it constitutes a tech ical rev ision

Annex A andAnnex B form an integ ral p rt of this International Stand rd

Annex C is for information only

1 Scope

This International Stand rd specifies the

characteristic of1 ,7mm ( 0,5in) wide mag netic

ta e with re l, to ena le mag netic and mechanical

inter hang ea i ty of such ta e betwe n information

proces ing sy stems

This International Stand rd a pl es solely to

mag netic ta e for dig ital recording using the NRZ1

method of recording at32ftpmm and3 6ftpmm

( 80 ftpi and90 2 ftpi or the phase-encoded

method of recording at1 6ftpmm ( 320 ftpi in

which the direction of mag netization is nominaly

long itudinal

NOT 1 Some n meric v lues in the SI an / or Imp rial

me surement system in this International Stan ard ha e b en

rou ded of an therefore are consistent with, but not e actly

e ual to, e ch other Either system ma b used,but the two

should b neither intermix d nor reconv rted The original

design was made using the Imp rial me surement system

2 Norm ative ref rences

The folowing stand rds contain prov isions which,

throug h reference in this text, constitute prov isions

of this International Stand rd At the time of

publ cation, the editions indicated were v al d All

stand rds are subject to rev ision, and p rties to

ag re ments b sed on this International Stand rd

are encourag ed to inv estig ate the pos ibi ity of

a ply ing the most recent editions of the stand rds

indicated below Member of IEC and ISO maintain

reg ister of cur ently v al d International Stand rds

ISO 20 -1:19 9, Wr ought a l uminium a nd

a l uminium a ll oys — Chemica l composiion a nd

f r ms o pr od ucts — Pa r t 1: Chemica l composi ion

ISO 4 8:19 2, Sur fa ce r ough e s — Pa r a meter s,

their va lue a nd gener a l r ules fr spe ifing

r equir ements

ISO 18 3:19 0, Inf r ma tion

pr oc s ing — 9-tr a ck, 12,7mm (0,5in) wid e

ma gnet c ta pe fr inf r ma tion inter cha nge using

NR Z1 a t3 ftpmm (80 ftpi —3 cpmm (80 cpi)

ISO/IEC 3 8 :19 0, Inf r ma tion

pr oc s ing — 9-tr a ck, 12,7mm (0,5in) wid e

ma gnet c ta pe fr inf r ma tion inter cha nge using

pha se encod ing

a t 12 ftpmm (3200 ftpi) ,6 cpmm ( 60 cpi)

ISO 5 52:19 4, Inf r ma tion

pr oc s ing — 9-Tr a ck, 12,7mm (0.5in) wid e

ma gnet c ta pe fr inf r ma tion inter cha nge —

For ma t a nd r ecor d ing, using gr oup cod ing

a t246cpmm (62 0 cpi

ISO 6 9 :19 4, Inf r ma tion pr oc s ing —

Self-loa d ing ca r tr id ge f r12,7mm (0.5in) wid e

ma gnet c ta pe

ASTM D 20 0, R ub er pr od ucts in a utomot ve

a pplica tions, cla ssifica tion system f r

3 Definitions

For the purposes of this International Stand rd, the

fol owing definitions a ply

3.1

m ag netic ta e

a ta e that wi ac ept and retain the mag netic

sig nals intended for input, output and storag e

purposes on computer and as ociated equipment

3.2

m aster standard referenc tape

a ta e selected as the stand rd for sig nal ampl tude

N T 2 A Master Stan ard Reference Ta e has b en

esta lshed at the US National Institute of Stan ards an

Tech olo y (NIST) for the physical recording densities

of3 ftpmm (8 0ftpi an 1 6ftpmm (32 0ftpi

a further Master Stand rd Reference Ta e has be n

esta lshed at the NIST for the phy sical recording

density of3 6ftpmm ( 90 2ftpi

3.3

se ond ry standard referenc ta e

a ta e for which the mag netic characteristic are

k own and stated in relation to that of the Master

Stand rd Reference Ta e It is intended that these

be used for cal brating tertiary reference ta es for

use in routine cal bration Se Annex B

N T 3 Secon ary Stan ard Reference Ta es are a aia le

fom the NIST,Ofice of Stan ards Reference Materials,

Ro m2 5,Buiding2 2,National Institute of Stan ards

Tech olo y,Gaitherburg , MD2 8 9, USA, u der the folowing

a erag e sig nal am pl tude

the av erag e peak-to-peak v alue of the sig nal output

to the rea hea when measured ov er a minimum

of7 mm ( 3,0in) ofta e

3.5

ty ical field

in the plot of the Av erag e Sig nal Ampl tude ag ainst

the recording field at the specified phy sical

recording density , it is the minimum field that

causes an Av erag e Sig nal Ampl tude equal to9 %

of the ma imum Av erag e Sig nal Ampltude

3.6

referenc field

the ty pical field of the Master Stand rd Reference

Ta e at the specified physical recording density

3.7

standard referenc cur ent

the cur ent that produces the Reference Field

tracea i ty to the Stand rd Reference Cur ent is

prov ided b the calbration factor( s) sup l ed with

each Second ry Stand rd Reference Ta e

3.8

test re ording cur ent

the cur ent that is k times the Stand rd Reference

Cur ent, where k equals:

2,0 to 2,2 at 32 ftpmm ( 80 ftpi

1,7 to 1,8 at 1 6 ftpmm ( 320 ftpi

1,3 to 1,4 at 3 6 ftpmm ( 90 2 ftpi

3.9

standard referenc am pl tude; SRA

the Av erag e Sig nal Ampltude fom the Master

Stand rd Reference Ta e when it is recorded with

the a propriate Test Recording Cur ent at one of

the specified phy sical recording densities

tracea i ty to the Stand rd Reference Ampl tude is

prov ided b the calbration factor( s) sup l ed with

each Second ry Stand rd Reference Ta e

3.10

referenc edg e

the edg e furthest f om an observ er when the ta e is

ly ing flat with the mag netic sur ace up ermost and

the direction of mov ement for recording is f om left

to rig ht

3.1

in-c ntact

an operating condition in which the mag netic

sur ace of a ta e is in contact with a mag netic hea

3.12

track

a long itudinal area on a ta e along which a series of

mag netic sig nals ma be recorded

3.13

row

nine transv er ely -related locations ( one in each

track) in which bits are recorded

3.14

position of flux transition

that point which exhibits the ma imum f e -sp ce

flux density normal to the ta e surace

3.15

physical re ording density

the n mber of recorded flux transitions per u it

leng th of track ( ftpmm or ftpi

resistanc per square

the sur ace resistance of a square area of any siz

measured betwe n electrodes placed along two

op osite sides of the square The u it of

measurement is the ohm

3.18

oxide c ating to bras and chrom e

the resistance of the ta e oxide coating to motion on

bras ( chrome)

3.19

oxide c ating to tape b ck sur ac

the resistance of the ta e oxide coating to motion on

the ta e b ck surace

3.2

ta e b ck sur ac to stainles ste l

the resistance of the ta e b ck surace to motion on

The conditions specified below refer to the ambient

conditions in the test or computer ro m and not to

those within the ta e driv e equipment

4.1 Testing environment

Unles otherwise stated, al measurements ma e on

a ta e to check compl ance with the requirements of

this International Stand rd and al tests pres ribed

for a ta e in this International Stand rd shal be

car ied out u der the env ironmental conditions

of23°C±2°C ( 73°F±4°F) and relativ e

h midity4 % to6 %, after at least24h of

conditioning in the same env ironment

4.2 Operating environm ent

The operating temperature shal be within the

rang e16°C to32°C ( 60°F to9 °F) and the relativ e

h midity20% to8 % Operation near the

extremes of these rang es can result in deg ra ed

per ormance The wet bulb temperature shal not

exce d25°C ( 78°F)

4.3 Storag e environment

During storag e, it is recommended that the ta es

are kept within the folowing conditions:

The ta e shal consist of a b se material ( oriented

poly ethy lene terephthalate fim or its equiv alent)

coated on one side with a strong y et flexible lay er of

fer omag netic material disper ed in a suita le

binder.I the ta e is also coated on the rear sur ace,

the coating shal be non-fer omag netic

5.4 Base material thicknes

The b se material thick es shal be0,0 8mm

The normal minimum leng th of ta e

is7 2m ( 24 0ft) spl ce-fe I the leng th of the

ta e is les than7 2 m ( 2 4 0ft), the actual leng th

shal be stated Ma imum ta e leng th is lmited b

thick es , E v alue ( se 5.7), moment of inertia and

re l dimensions

5.7 E v lue

The E v alue is the ra ial distance b which the re l

flang es extend bey ond the outermost lay er of a ta e

which has be n wound at a tension

of2 N to3,6N ( 7o f to13o f) on the specified re l

The minimum E v alue shal be3,2mm ( 0,1 5in)

W hen the ta e is used with a self- oa ing cartridg e

( se ISO6 9 ), the E v alue shal satis y :

6,3mm ( 0,25in) u E u15,9mm ( 0,625in)

5.8 Elastoplastic properties

The elastoplastic properties of the ta e shal be such

that when the ta e is subjected to a tension

of3 N ( 10 o f) for a period of3min u der any

combination of temperature and relativ e h midity

within the rang es of10°C to5 °C ( 50°F to1 2 °F)

and20% to8 % relative h midity , the permanent

elong ation measured with neg lig ible tension after a

second3min interv al is les than1,0%

5.9 Long itudinal curv ture

There shal be a minimum ra ius of curv ature for

the edg e of the ta e, defined and tested b al owing

a1 m ( 36in) leng th of the ta e to u rol and as ume

its natural curv ature on a flat sur ace The

minimum ra ius shal be3 m ( 10 ft).I measured

ov er an ar ofa cir le, this cor esponds to a

dev iation of3,8mm ( 1/8in) fom a1m ( 36in)

chord

5.10 Ta e wind

Ta e shal be wound, with its mag netic surace

toward the re l h b, in a clockwise direction;

i.e when the re l is v iewed f om the font, the lo se

end of the ta e hang s f om the rig ht side of the re l

Ta e shal be wound with a tension

of2 N to3,6N ( 7o f to13o f) ( se Fig ure 2)

5.1 Mag netic properties

The mag netic properties of the ta e are not defined

here b B-H lo ps or simi ar p rameter , but are

defined b the testing procedures g iv en in5.13

and5.15

5.12 Test density

For the purpose of testing ta e in ac ord nce with

this International Stand rd, the phy sical recording

density shal be32 ftpmm,1 6ftpmm

or3 6ftpmm ( 80 ftpi, 320 ftpi or90 2ftpi.The

flux transitions shal be u iformly sp ced The flux

transition sp cing and the track config uration shal

conform to ISO18 3, ISO3 8 or ISO5 52 as

a propriate

5.13 Ty ical Field

The Ty pical Field of the ta e u der test shal be

within±20% of the Reference Field for a phy sical

recording density of32 ftpmm ( 80 ftpi

or1 6ftpmm ( 320 ftpi and within±15% of the

Reference Field for a phy sical recording density