SIST EN 60843-1:1999

Helical-scan video tape cassette system using 8 mm magnetic tape - 8 mm Video -- Part 1: General specifications

Applies to magnetic video recording and/or playback with 8 mm tape cassettes on two-head helical-scan video cassette recorders, suitable for the recording and/or playback of monochrome as well as colour television signals. Defines the electrical and mechanical characteristics of equipment which will provide for interchangeability of recorded cassettes, including the ability to reproduce recordings made on both types of magnetic tapes defined in section 2. Related to 525 line / 60 field or 625 line / 50 field systems, NTSC and PAL respectively.

Video-Bandkassettensystem mit Schrägspuraufzeichnung auf Magnetband 8 mm - 8 mm Video -- Teil 1: Allgemeine Festlegungen

Système de magnétoscope à cassette à balayage hélicoïdal utilisant la bande magnétique de 8 mm - Vidéo de 8 mm -- Partie 1: Généralités

S'applique à l'enregistrement et/ou à la lecture de signaux vidéo sur bande magnétique avec des cassettes de bande de 8 mm sur des magnétoscopes à deux têtes à défilement hélicoïdal convenant à l'enregistrement et/ ou à la lecture de signaux de télévision noir et blanc aussi bien que de signaux de télévision couleur. Défini les caractéristiques électriques et mécaniques de l'équipement qui permettra l'interchangeabilité des cassettes, comprenant la possibilité de reproduire les enregistrements faits sur les deux types de bandes magnétiques définis dans la section 2. Se rapporte respectivement aux systèmes NTSC 525 lignes/60 trames, ou PAL 625 lignes/50 trames.

Helical-scan video tape cassette system using 8 mm magnetic tape - 8 mm Video -- Part 1: General specifications (IEC 60843-1:1993)

General Information

• Status: Published
• Publication Date: 31-Mar-1999
• ICS: 33.160.40 - Video systems
• Technical Committee: AVM - Audio, video and multimedia systems and equipment
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Apr-1999
• Due Date: 01-Apr-1999
• Completion Date: 01-Apr-1999
• Ref Project: EN 60843-1:1994 - Helical-scan video tape cassette system using 8 mm magnetic tape - 8 mm Video - Part 1: General specifications

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Helical-scan video tape cassette system using 8 mm magnetic tape - 8 mm Video -- Part 1: General specifications (IEC 60843-1:1993)Video-Bandkassettensystem mit Schrägspuraufzeichnung auf Magnetband 8 mm - 8 mm Video -- Teil 1: Allgemeine FestlegungenSystème de magnétoscope à cassette à balayage hélicoïdal utilisant la bande magnétique de 8 mm - Vidéo de 8 mm -- Partie 1: GénéralitésHelical-scan video tape cassette system using 8 mm magnetic tape - 8 mm Video -- Part 1: General specifications33.160.40Video sistemiVideo systemsICS:Ta slovenski standard je istoveten z:EN 60843-1:1994SIST EN 60843-1:1999en01-april-1999SIST EN 60843-1:1999SLOVENSKI
STANDARD



SIST EN 60843-1:1999



SIST EN 60843-1:1999



SIST EN 60843-1:1999



SIST EN 60843-1:1999



SIST EN 60843-1:1999



SIST EN 60843-1:1999



NORMEINTERNATIONALEINTERNATIONALSTANDARDCEIIEC843-1Deuxième éditionSecond edition1993-12Système de magnétoscope à cassetteà balayage hélicoïdal utilisant la bandemagnétique de 8 mm - Vidéo 8 mmPartie 1:GénéralitésHelical-scan video tape cassettesystem using 8 mm magnetic tape -8 mm videoPart 1:General specifications© CEI 1993 Droits de reproduction réservés — Copyright — all rights reservedAucune partie de cette publication ne peut être reproduite niNo part of this publication may be reproduced or utilizedutilisée sous quelque forme que ce soit et par aucun procédé,in any form or by any means, electronic or mechanical,électronique ou mécanique, y compris la photocopie et lesincluding photocopying and microfilm, without permissionmicrofilms, sans raccord écrit de réditeur.in writing from the publisherBureau central de la Commission Electrotechnique Internationale 3, rue de Varembé Genève SuisseTéléfax: [phone]e-mail: inmail(C1^Iec.chIEC web site http://www.iec.chIEC1111Commission Electrotechnique InternationaleInternational Electrotechnical CommissionMex ayHapo,HaR 3neKTpoTexHN4ecnaR HOMHCCHR•CODE PRIX XAPRICE CODEPour prix, voir catalogue en vigueurFor price, see current catalogueSIST EN 60843-1:1999



843-1 © I EC: 1993– 3 –CONTENTSPageFOREWORD 11ClauseSECTION 1: GENERAL1.1 Scope and object 131.2 Normative references 131.3 Environmental conditions
13SECTION 2: VIDEO TAPE2.1 Types of magnetic tape and reference tape
152.2 Physical properties of the tape 152.2.1Magnetic tape width 152.2.2 Magnetic tape width fluctuation 152.2.3 Magnetic tape thickness
152.2.4 Transparency of the magnetic tape 152.3 Magnetic properties of the tape 152.4 Recording characteristics of the tape 172.4.1Video characteristics of the tape
172.4.2Auxiliary audio characteristics 19SECTION 3: VIDEO TAPE CASSETTE3.1 Mechanical parameters 213.1.1Dimensions of the cassette
213.1.2 Datum planes Z, X and Y 213.1.3 Tape winding
213.1.4 Window and label 213.1.5Withdrawal force
213.1.6 Support areas A, B, C and D 213.1.7 Cassette holding areas
213.1.8Incorrect insertion protection 233.1.9Accidental erasure protection 233.1.10 Recognition holes
233.1.11 Changer grip 233.1.12 Lid
233.1.13 Reels
253.1.14 Reel spring 25SIST EN 60843-1:1999



843-1 ©IEC: 1993- 5 -ClausePage3.2 Magnetic tape length 273.3 Leader and trailer tape
273.3.1Automatic stop 273.3.2Dimensions of the leader and trailer tape 273.3.3 Transparency of the leader and trailer tape
273.3.4Splicing 273.4 Cassette designation
27SECTION 4: VIDEO CASSETTE RECORDERS4.1 Tape speed 514.1.1525 line - 60 field system 514.1.2625 line - 50 field system 514.2 Drum diameter 514.3 Tape tension
514.4 Inclined azimuth angle 514.5 Track configuration and dimensions
51SECTION 5: RECORDING CHARACTERISTICS OF THE VIDEO SIGNAL5.1 Video recording system
575.1.1Block diagram for video recording
575.1.2 Frequency spectrum allocation of recording signals
595.2 Recording of the luminance component 615.2.1Luminance filter 615.2.2 Pre-emphasis and clipping 615.2.3Modulation characteristics
635.2.4FM high-pass filter
655.2.5 Recording current
655.3 Recording of the chrominance component 655.3.1Recording method 655.3.2 Pre-emphasis 655.3.3 Conversion method 675.3.4Recording equalization 695.3.5Recording current
695.3.6 Colour burst amplitude
695.3.7 Time difference between luminance and chrominance
69SIST EN 60843-1:1999



843-1 © IEC: 1993- 7 -SECTION 6: RECORDING CHARACTERISTICS OF THE AUDIO SIGNALClausePage6.1 Audio recording system
716.2 FM audio signal recording 716.2.1Carrier frequency
716.2.2 Reference deviation 716.2.3 Maximum deviation
716.2.4 Recording FM signal channel bandwidth
716.2.5Recording current
716.2.6 Noise reduction
736.2.7 Others 736.3 PCM audio signal recording 736.3.1Audio signal format 736.3.2 PCM signal format
736.3.3 PCM signal train 936.3.4Error correction
936.3.5Error detection 956.3.6 Modulation
956.3.7 Recording conditions
956.3.8 Noise reduction
976.4 Audio signal recording on the auxiliary audio track 976.4.1Reference level
976.4.2 Playback equalization 976.4.3Noise reduction
976.5 Noise reduction system
976.5.1Specifications for FM and PCM audio 976.5.2Specifications for AUX audio 103SECTION 7: CHARACTERISTICS OF THE TRACKING SYSTEM7.1Tracking pilot signal recording 1057.1.1Tracking pilot signal frequencies
1057.1.2Recording current
1077.2Recording head positioning pilot signal recording (optional) 1077.2.1The burst pilot signal write and read area
1077.2.2The burst pilot signal frequency 1097.2.3Recording current
109SIST EN 60843-1:1999



843-1 ©IEC: 1993- 9 -SECTION 8: AUXILIARY TRACK FOR CUEClausePage8.1Recording on auxiliary cue track 109Annex A - Reference tape and sub-reference tape 111Figures 29Tables
51SIST EN 60843-1:1999



843-1 © IEC: 1993-11 -INTERNATIONAL ELECTROTECHNICAL COMMISSIONHELICAL-SCAN VIDEO TAPE CASSETTESYSTEM USING 8 mm MAGNETIC TAPE - 8 mm VIDEOPart 1: General specificationsFOREWORD1)The IEC (International Electrotechnical Commission) is a worldwide organization for standardizationcomprising all national electrotechnical committees (IEC National Committees). The object of the IEC is topromote international cooperation on all questions concerning standardization in the electrical andelectronic fields. To this end and in addition to other activities, the IEC publishes International Standards.Their preparation is entrusted to technical committees; any IEC National Committee interested inthe subject dealt with may participate in this preparatory work. International, governmental andnon-governmental organizations liaising with the IEC also participate in this preparation. The IECcollaborates closely with the International Organization for Standardization (ISO) in accordance withconditions determined by agreement between the two organizations.2)The formal decisions or agreements of the IEC on technical matters, prepared by technical committees onwhich all the National Committees having a special interest therein are represented, express, as nearly aspossible, an international consensus of opinion on the subjects dealt with.3)They have the form of recommendations for international use published in the form of standards, technicalreports or guides and they are accepted by the National Committees in that sense.4)In order to promote international unification, IEC National Committees undertake to apply IEC InternationalStandards transparently to the maximum extent possible in their national and regional standards. Anydivergence between the IEC Standard and the corresponding national or regional standard shall be clearlyindicated in the latter.International Standard IEC 843-1 has been prepared by sub-committee 60B: Video recor-ding, of IEC technical committee 60: Recording.This second edition cancels and replaces the first edition published in 1987 andconstitutes a technical revision.The text of this standard is based on the following documents:DISReport on Voting60B(CO)14860B(CO)166Full information on the voting for the approval of this standard can be found in the reporton voting indicated in the above table.IEC 843 consists of the following parts, under the general title: Helical-scan video tapecassette system using 8 mm magnetic tape - 8 mm videoPart 1: General specifications-Part 2: PCM multi-track audio system-Part 3: High-band specifications for 8 mm video - Hi 8Annex A is for information only.SIST EN 60843-1:1999



843-1 © I EC: 1993- 13 -HELICAL-SCAN VIDEO TAPE CASSETTESYSTEM USING 8 mm MAGNETIC TAPE - 8 mm VIDEOPart 1: General specificationsSECTION 1: GENERAL1.1 Scope and objectThis part of IEC 843 applies to magnetic video recording and/or playback with 8 mm tapecassettes on two-head helical-scan video cassette recorders, suitable for the recordingand/or playback of monochrome as well as colour television signals.The object of this part is to define the electrical and mechanical characteristics ofequipment which will provide for interchangeability of recorded cassettes. This will includethe ability to reproduce recordings made on both types of magnetic tapes defined insection 2. The requirements given are related to 525 line - 60 field or 625 line - 50 fieldsystems, NTSC and PAL respectively.1.2 Normative referencesThe following normative document contains provisions which, though reference in this text,constitute provisions of this part of IEC 843. At the time of publication, the editionindicated was valid. All normative documents are subject to revision, and parties toagreements based on this part of IEC 843 are encouraged to investigate the possibility ofapplying the most recent edition of the normative document indicated below. Members ofIEC and ISO maintain registers of currently valid International Standards.IEC 843-2: 1993, Helical-scan video tape cassette system using 8 mm magnetic tape -8 mm video - Part 2: PCM multi-track audio systemsIEC 843-3: 1993,.Helical-scan video tape cassette system using 8 mm magnetic tape -8 mm video - Part 3: High-band specifications for 8 mm video - Hi 8IEC 1105: 1991, Reference tapes for video tape recorder systems1.3 Environmental conditionsTests and measurements made on the system to check the requirements of this standardshall be carried out under the following conditions:Temperature:20 °C ± 1°CRelative humidity:(50 ± 2) %Air pressure:86 kPa to 106 kPaConditioning before testing: 24 hSIST EN 60843-1:1999



843-1 © IEC: 1993- 15 -SECTION 2: VIDEO TAPE2.1 Types of magnetic tape and reference tapeThe 8 mm video tape exists in two types: type A and type B.Type A is a metal powder tape or its equivalent, the characteristics of which are referredto as type A reference (see annex A).Type B is a metal evaporated tape or its equivalent, the characteristics of which arereferred to as type B reference (see annex A).The performance of reference tapes is specified in IEC 1105.The reference tapes are intended as reference only for video and audio characteristicsspecified in 2.4.2.2 Physical properties of the tape2.2.1 Magnetic tape widthThe width of the magnetic tape shall be 8,000 mm ± 0,010 mm.2.2.2 Magnetic tape width fluctuationThe fluctuation of the magnetic tape width shall be no more than 0,006 mm peak-to-peak.2.2.3 Magnetic tape thicknessThe thickness of the magnetic tape shall be:13,0 gm ± 1,0 gm(10,0 gm ± 0,8 gm) (under consideration)2.2.4 Transparency of the magnetic tapeThe transparency of the magnetic tape for 800 nm - 900 nm wavelength light shall be lessthan 5 %.2.3 Magnetic properties of the tapeThe magnetic properties of the magnetic tape, such as coercivity, remanence andmagnetic orientation, are not specified.The compatibility of tapes of the same type shall be maintained by the characteristics ofthe tape specified in 2.4.SIST EN 60843-1:1999



843-1 ©IEC: 1993-17 -2.4 Recording characteristics of the tapeAll measurements are to be made in comparison to the reference tape as described in 2.1,whereby the reference values are taken as the 0 dB point.2.4.1 Video characteristics of the tape2.4.1.1RF optimum recording currentThe RF optimum recording current shall be 0 dB ± 2 dB at 5 MHz.The RF optimum recording current is the RF recording current necessary to obtain themaximum output signal level during playback. It shall be expressed in decibels as the ratiorelative to the RF reference recording current.The RF reference recording current is the RF optimum recording current of the referencetape.2.4.1.2RF output levelThe RF output level shall be:For luminance:greater than -3 dB at 5 MHz.For chrominance: greater than -2 dB at 0,75 MHz andless than - 20 dB for 3,5 MHz spurious level relative to 5 MHz.a)Luminance outputThe luminance output is the playback level of the 5 MHz signal recorded at the RFreference recording current. It shall be expressed in decibels as the ratio relative to the(see 2.4.1.1) luminance output of the reference tape.b)Chrominance outputThe output level of the 0,75 MHz signal played back from the tape which 5,0 MHz and0,75 MHz signals have been recorded in a superposed manner shall be measuredunder the following conditions.5 MHz recording current:The RF reference recording current at 5 MHz.0,75 MHz recording current:The current of the reference tape at which 3,5 MHz spurious level is -22 dB relative to theplayback level of the 5 MHz signal.The chrominance output is then defined as the ratio, expressed in decibels, of the outputlevel of the 0,75 MHz signal played back from the tape to be tested to that from thereference tape.2.4.1.3 RF frequency responseThe RF frequency response D of the video signal shall be between +3 dB and -2 dB.SIST EN 60843-1:1999



843-1 ©IEC: 1993- 19 -The playback output levels of the 2,0 MHz signal and the 5,0 MHz signal which arerecorded at the RF reference recording current of the respective frequencies shall bemeasured.The RF frequency response is defined by D.D = d - dowhere d is the relative value in dB of the playback output level of the 5,0 MHz signal tothat of the 2,0 MHz signal for the tape to be tested, and do is the same for the referencetape.2.4.2 Auxiliary audio characteristics2.4.2.1SensitivityThe sensitivity of the AUX audio signal specified in 6.4 shall be greater than -3 dB at1 kHz:The playback output level of the 1 kHz signal shall be measured, with a recording made ata reference recording level and at a reference bias current.Audio sensitivity is defined as the ratio, expressed in decibels, of the playback output levelat 1 kHz of the tape to be tested to that of the reference tape.Reference bias current:The reference bias current is the bias current necessary to obtain the maximum playbackoutput level from the reference tape on which the 1 kHz signal has been recorded at aconstant recording level lower than the reference recording level.Reference recording level:The reference recording level is the input level of 1 kHz for the reference tape and at thereference bias current, which results in. 3rd harmonic distortion of 3 %.2.4.2.2ErasabilityThe erasability of the AUX audio signal shall be greater than 55 dB at 1 kHz.A signal of 1 kHz shall be recorded on the tape to be tested at the reference bias currentand at a recording level 10 dB higher than the reference recording level.A portion of the above-mentioned recording shall be erased. The erasing current used inthe erasability measurement shall be 2 dB higher than the erasing current necessary toobtain an erasability of 55 dB for the reference tape. The erasability is expressed as theratio in decibels of the playback output level of the non-erased portion to the residualplayback output level of the erased portion.SIST EN 60843-1:1999



843-1 © IEC: 1993- 21 -SECTION 3: VIDEO TAPE CASSETTE3.1 Mechanical parameters3.1.1 Dimensions of the cassetteThe dimensions necessary to permit interchangeability of cassettes shall be in accordancewith figures 1 to 17, pages 29 to 49, and table 1.3.1.2 Datum planes Z, X and YDatum plane Z shall be determined by datum areas A, B and C, indicated in figure 3,page 33, by hatching. Datum plane X shall be orthogonal to datum plane Z and shall runthrough the centre of datum hole A and datum hole B, as shown in figure 3.Datum plane Y shall be orthogonal to both datum plane X and datum plane Z and shall runthrough the centre of datum hole A as shown in figure 3.3.1.3 Tape windingThe magnetic coating on the tape shall face out of the cassette. The direction of tapetravel is from left to right, i.e. from supply reel and outside on to the take-up reel as shownin figure 4, page 35.3.1.4 Window and labelPart of the reels shall be visible somewhere within the cross-hatched area shown infigure 1, page 29. The window through which a part of the reels can be seen shall notextend beyond the height of the cassette. The label shall not extend beyond the height ofthe cassette.3.1.5 Withdrawal forceThe attachment of the leader and trailer tape to the hub shall be capable of withstanding aforce of 10 N. The manner of attachment is a matter of the manufacturer's own individualchoice.3.1.6 Support areas A, B, C and DSupport areas A, B and C in figure 3 shall be coplanar with datum areas A, B and C,respectively, within ±0,1 mm. Support area D shall be coplanar with datum plane Z within±0,15 mm. The support area is suppressed 0,5 mm from the edge of the cassette.3.1.7 Cassette holding areasThe cassette shall be supported by the recorder and/or player unit in the hatched areashown in figure 1.SIST EN 60843-1:1999



843-1 © IEC: 1993– 23 –3.1.8 Incorrect insertion protectionThe cassette shall be provided with the channel, recess and incline shown in figure 1,page 29, to protect it from being wrongly inserted in three directions.3.1.9 Accidental erasure protectionThe cassette shall be provided with a mechanism allowing the user to open and close theaccidental erasure protection hole as desired. When the accidental erasure protection holeis open, it will be impossible to record on the cassette. When the accidental erasureprotection hole is closed, it will be possible to record the cassette. The mechanism shallbe constructed so that it can withstand a force of 0,5 N (see figure 2, page 31). Theaccidental erasure protection hole on the upper shell may be either closed or open at themanufacturer's discretion.3.1.10 Recognition holesThe cassette shall be provided with five recognition holes on the lower shell as shown infigure 2. Recognition hole 1 shall be used to distinguish tape type A from tape type B. Theclosed hole shall signify type A. The open hole shall signify type B. Recognition holes 2and 3 shall be used for distinguishing tape thickness. Hole 2 shall be closed for tape13 pm thick and open for tape 10 pm thick. The use of hole 3 has not been defined indetail. Use of recognition holes 4 and 5 is under consideration.The holes will remain closed until their use is decided. Recognition holes 1 to 5 on theupper shell may be either closed or open at the manufacturer's discretion. A closedrecognition hole shall be constructed so that it can withstand a force of 0,5 N.3.1.11 Changer gripThe cassette shall be provided with two changer grips for an automatic changing machineas shown in figure 1.3.1.12 Lid3.1.12.1Lid structurea)The lid is in two pieces, the main section and the smaller auxiliary section.b)Pivot A of the main section shall be positioned 0,55 mm from datum plane X and7,5 mm from datum plane Z (see figure 10, page 43).c)The main lid revolves around pivot A. The auxiliary section slides along the camand around pivot B so that neither section extends above a plane maximum 22,3 mmfrom and parallel to datum plane Z with the lid open (see figure 11, page 43).d)Pivot B of the auxiliary section shall be positioned in the sockets inside the mainsection 10,1 mm from pivot A of the main section in the. X direction and 7 mm fromdatum plane Z (see figure 10). The socket of the main section may be positionedanywhere in the Y direction and anywhere outside plane D in figure 12, page 45, whenthe lid is closed.SIST EN 60843-1:1999



843-1g IEC: 1993- 25 -e)The maximum permissible rotation radius when the lid is open is 14,9 mm. Thismeans the maximum permissible height when the lid is open is 22,5 mm (seefigure 11).f)When the lid is open, surface D of the main section (see figure 13, page 47) shall bewithin 5° 1: datum plane X.g)The length of the upper side of the auxiliary section has not been specified.h)The light window in the main section shall be aligned with the light window in theshell when the lid is open.3.1.12.2 Automatic lockingThe lid shall unlock automatically when the cassette is inserted into a recorder and/orplayer and lock automatically when the cassette is ejected.3.1.12.3 Force needed to unlock the lidThe lid shall be unlocked by causing the unlocking lever to move in the X-X, Z-Z or Y-Ydirection, as illustrated in figure 8, page 41. The force needed to unlock the lid shall not begreater than 0,25 N in the Y-direction (see figure 16, page 49).3.1.12.4 Force needed to open the lidThe maximum force needed to open the lid shall be 1,0 N (see figure 17, page 49).3.1.13 Reels3.1.13.1Dimensions of the reelsThe dimensions of reels and the relationship between the reel and reel table are shown infigures 5 and 6, page 37. Within the range of maximum 0,7 mm, the height of the stopperis a matter of the manufacturer's own individual choice.3.1.13.2Locking the reelThe reels shall lock when the cassette is removed from the recorder and/or player in orderto prevent the tape loosening during storage or transportation. When the cassette is in therecorder and/or player, the reels shall be unlocked automatically with the release of thereel lock (see figure 7, page 39). The maximum force needed to release the reel lock shallbe 1,0 N in the Y-direction (see figure 15, page 49).3.1.14 Reel springThe reels shall be held in position in the cassette by a reel spring with a force of 0,4 Nto 0,8 N (see figure 6).SIST EN 60843-1:1999



843-1 ©IEC: 1993- 27 -3.2 Magnetic tape lengthThe length of the magnetic tape shall be determined by the following formula:60 1L = (1 + 0,005) Vt x (T+ 2) x± o m1 000whereVt is the tape speed in millimetres per secondT is the playable time in minutes3.3 Leader and trailer tape3.3.1 Automatic stopWhen the leader or trailer tape passes behind the light window (see figure 13, page 47),the recorder and/or player shall stop automatically (for the light path, see figure 4,page 35).3.3.2 Dimensions of the leader and trailer tapeThe length of the leader and trailer tape shall be 80 mm ± 10 mm as shown in figure 14,page 47. The width of the leader and trailer tape shall be 8 mm ± 0,02 mm. The thicknessof the leader and trailer tape shall be sufficient to allow the tape to withstand a tension of10 N.3.3.3 Transparency of the leader and trailer tapeThe transparency of the leader and trailer tape shall be 60 % or more, measured in thesame way as the transparency of the magnetic tape (see 2.2.4).3.3.4 SplicingThe splice shall withstand a tension of 10 N. The splicing tape shall be no more than13 mm long.3.4 Cassette designationThe following type name shall be used uniformly to identify 8 mm video cassettes:Type of magnetic tapeTelevision systemType AType B525 line – 60 fieldP6 - TE6- T625 line – 50 fieldP5 - TE5 - Twhere T is the playable time in minutes.SIST EN 60843-1:1999



Incorrect insertionprotection recess Z-ZIncorrect insertionprotection incline Y-YDatum plane XMrnChanger gripChan1,5(12).Datum plane Y• Incorrect insertion channel X-XNote 4843-1 © IEC: 1993- 29 -=Datum plane Z2 ± 0,22,5 ---Tolerances unless otherwise specified30>_L:±0,150?L>30':±0,15100>_L>50 :'±0,2Angle: ± 1°Datum plane XNote 3Section A-ANote 5Section B-B1EC 151193Dimensions in millimetresNOTES1 Some part of this window must be in the cross-hatched area. The window shall not extend beyond theheight of the cassette.2 The cassette shall be supported by the recorder and/or player unit in the hatched area.3Indication of accidental erasure protection may be placed in this area at the manufacturer's discretion.4Rear label may be attached in this optional recessed area.5 Dimension C shall be no more than 8,4 mm from datum plane X as illustrated so that the lid opener doesnot touch point D on the upper shell when the lid is open.Figure 1 - Appearance of the video cassette (top and side view)SIST EN 60843-1:1999



*Datum hole B1Datum hole A+0,050 3oMouth^ R 2,3+0,3 ^O 6,5 o Datum plane XoCh +I'ln.+tCV'CO.^.'1 ^.M,CÀ•^:M Cn'Datum hole D cr):^ 't.^ cNo\3,50A •^^ dM+111^^I.'111111Vint.,116,Recognition hole: 0 3.C^)1,5coRecognition hole 503 DAccidental erasure /protection holeRecognition hole 146,2±0,1(72,6) (76,7)79(79,2)89,4 ± 0,1(82)95Recognition hole 4Recognition hole 32,3 Recognition hole 2^. *For datum holes B,Dabove formation is possibleSection B-B'Section C-C;843-1 Oo 1 EC: 1993-31 -Datum plane Y79,7Direction levelRemovable pieceSection D-DfEC 152/93Dimensions in millimetresNOTE - The mechanism of accidental erasure protection shall be constructed so that it can withstand aforce of 0,5 N applied in the direction of the arrow.Figure 2 - Appearance of the video cassette (bottom view)SIST EN 60843-1:1999



SupportedocoDatum areDatum heSupported arireao^A0 5-`---area ADatum'.Datum area B^I^^,-,illcDatum hole/ADatum hole B__^.:C:^:v2:/116::•#.%^$44.4 •^r••••.,^••^^^^^^^O^''^i^io•=•°--' -'-11^_^ôkir101I►^0,5^10115,5111111M\7^•• •.!•!•!a Cle Cea^!.^`^•'i^^i.^^^,*,i':!i'i'i.♦ ^ ••.^^0 ••'i'i.^•.••►'^^,• ^^'^►.^^.^'^!:^•'.!•^•!.!•!•••^4_^^^^^^^^^.^•••••^•r^^^^,•^^^.^•iii^^IL.^♦•••^^ ^•!^h':••T0.WC'^:64,5Supported area DSupported area BDatum plane X843-1 © IEC: 1993- 33 -Datum plane Y68 ± 0.10 6Datum area for measurementIEC 153193Dimensions in millimetresFigure 3 - Datum areas and supported areasSIST EN 60843-1:1999



Datum plane XDatum plane YR 1,5Datum plane YTapeNote 4R3Lc)ôThis corner ispreferably roundedType 1Type 2Details of ADatum plane X843-1 © IEC: 1993– 35 –IEC 154/93Dimensions in millimetresNOTES1Dimensions marked with` are nominal values specifying the tape path.2 Maximum diameter of wound magnetic tape including leader and trailer tape.3Refer to figure 13, page 47, for height of light path.4Forms type 1 and type 2 are possible.Figure 4 – Internal structure, tape path and light path (top view)SIST EN 60843-1:1999



0 45,1 0.5Note 1Max. 0,6iO16 0Nm018 0-0,1(+)IEC 155193843-1 © IEC: 1993– 37 –Dimensions in millimetresNOTES1Ratchet for reel lock of the upper part of the reel is at the manufacturer's discretion.2 Minimum depth 9,4 mm of reel driving hole shall be effective at diameter 6,5 mm +0,08 mm.0Figure 5 – Reel of the cassette
Tape centre
Er)oDatum plane ZMaximum reel table areaXmReel table support areaIEC 156/93Dimensions in millimetresNOTES1Height of reel table.2Stopper to prevent reel from slipping into shell.3Reel spring pressure shall be within 0,4 N to 0,8 N when the height of the reel table support area is0,6 mm ± 0,2 mm from datum plane Z.Figure 6 – Relationship between the reel and reel tableSIST EN 60843-1:1999



Locked position843-1 © IEC: 1993– 39 –Locked positionIEC 157/93Dimensions in millimetresNOTES1Clearance between reel lock and inside of shell shall be minimum 0,5 mm when the release pin islocated at 41,75 mm from datum plane X.2 The end of the reel lock shall remain outside the reel area 46,3 mm in diameter, when the release pin islocated at 41,75 mm from datum plane X.Figure 7 – Reel lock and releaseSIST EN 60843-1:1999



.-r^^±1►'___^ilk \^\\\\\\\\\^:^^:^^^tJaralNote 3X(C2Lid lock!EC 158193Dimensions in millimetresDatum plane X •Release leverNote 2I[Y-Y] —^Release lever843-1 ©IEC: 1993-41 -0,5Datum plane Xz Tape`Y11,2 1 '!.- OcoShellNOTES1When release lever is in the hatched area, the lid lock can be released.2 The lid lock can be released in Y-Y direction by inserting release lever from the side of the cassette andmoving to X-X direction.3The lid lock release lever insertion area.4Dimensions marked with * are nominal values.Figure 8 - Lid lock and releaseSIST EN 60843-1:1999



Datum plane ZIEC 159/93NOTE - Dimensions marked with * are nominal values.Figure 9 — Maximum size of lid (side view)Datum plane XFigure 10 — Lid structureLid rotating.Tape to auxilliary lidclearence at last 1,0Max. R 14,9843-1 © IEC: 1993— 43 —Datum plane XMax. 7,7Dimensions in millimetresIEC 160/93IEC 161/93Dimensions in millimetresFigure 11 — Lid configuration when rotating and when openSIST EN 60843-1:1999



Datum plane XPlane D//%///,,Datum plane X=13,8 ± 0,3Section B-B843-1 © IEC: 1993- 45 -Datum plane YMin. 66,8Datum plane ZMax. 1,2(Bottom view)',/,/ff///,(///Dimensions in millimetresNote — Dimensions marked with * are nominal values(Front view)a511.•§4.h.'4.1MMI IMax. 1,2Min. 66,8Datum plane Z -1694s. 14,8^Datum plane Y(Bottom view)IEC 162/93Dimensions in millimetresFigure 12 - Minimum space for recorder and/or player loading mechanismSIST EN 60843-1:1999



Lid openerSurface DMagnetic tape5 , Splicing tape!Magnetic tape-Splicing tape.cpRecording sideRecording sideIEC 164193843-1 © IEC: 1993—47-Datum plane XDatum plane ZIEC 163193Dimensions in millimetresFigure 13 - Light path and light windowDimensions in millimetresFigure 14 - Leader and trailer tapeSIST EN 60843-1:1999



843-1 ©IEC: 1993- 49 -Figure 15 - Force needed to unlock the reel lockFigure 16 - Force needed to unlock the lid lockFigure 17- Force needed to open the lidSIST EN 60843-1:1999



843-1 © IEC: 1993-51 -Table 1 - General tolerances for various dimensions of video tape cassette(except those for which tolerances are otherwise specified)DimensionTolerance0 ...