SIST EN 60094-3:1999

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Magnetic tape sound recording and reproducing systems -- Part 3: Methods of measuring the characteristics of recording and reproducing equipment for sound on magnetic tape (IEC 60094-3:1979 + A1:1980 + A2:1988)Systeme für Tonaufzeichnung und -wiedergabe auf Magnetband -- Teil 3: Meßverfahren zur Bestimmung der Eigenschaften von Aufnahme- und WiedergabegerätenSystèmes d'enregistrement et de lecture du son sur bandes magnétiques -- Partie 3: Méthodes de mesure des caractéristiques des matériels d'enregistrement et de lecture du son sur bandes magnétiquesMagnetic tape sound recording and reproducing systems -- Part 3: Methods of measuring the characteristics of recording and reproducing equipment for sound on magnetic tape33.160.30Avdio sistemiAudio systemsICS:Ta slovenski standard je istoveten z:EN 60094-3:1996SIST EN 60094-3:1999en01-april-1999SIST EN 60094-3:1999SLOVENSKI
STANDARD



SIST EN 60094-3:1999



SIST EN 60094-3:1999



SIST EN 60094-3:1999



SIST EN 60094-3:1999



SIST EN 60094-3:1999



IEC•NORMECEIINTERNATIONALEIECINTERNATIONAL94-3STAN DARDPremière éditionFirst edition1979Systèmes d'enregistrement et de lecture du sonsur bandes magnétiquesTroisième partie:Méthodes de mesure des caractéristiques desmatériels d'enregistrement et de lecture du sonsur bandes magnétiquesMagnetic tape sound recording andreproducing systemsPart 3:Methods of measuring the characteristics ofrecording and reproducing equipment forsound on magnetic tape© CEI 1979 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 l'accord écrit de l'éditeur.in writing from the publisherBureau central de la Commission Electrotechnique Internationale 3, rue de Varembé Genève SuisseCommission Electrotechnique Internationale CODE PRIXInternational Electrotechnical Commission PRICE CODEMenHnyHapomiaR 3neerporexHH4ecnan HOMHCCHAPour prix, voir catalogue en vigueurFor price, see current catalogueTSIST EN 60094-3:1999



— 3 --CONTENTSPageFOREWORD 5PREFACE 5SECTION ONE — INTRODUCTIONClause1.Scope 92.Object 9SECTION Two — GENERAL NOTES ON MEASUREMENTS3.Information to be supplied by manufacturer of equipment94.Identification 95.Technical description 116.Mechanical characteristics117.Electrical characteristics138.Rated conditions139.Performance claims 17SECTION THREE — PRECAUTIONS TO BE TAKEN DURING MEASUREMENTS10.Conditions of measurement 23SECTION FOUR — METHODS OF MEASUREMENT11.Measurement of mechanical parameters2512.Measurement of electrical parameters33SIST EN 60094-3:1999



Document60A(Central Office)43Document60A(Central Office)47AustraliaAustriaBelgiumCanadaDenmarkEgyptFinlandFranceGermanyHungaryItalyJapanNetherlandsPortugalRomaniaSouth Africa(Republic of)XXXXxxxXxxXXXx5INTERNATIONAL ELECTROTECHNICAL COMMISSIONMAGNETIC TAPE SOUND RECORDING AND REPRODUCING SYSTEMSPart 3 : Methods of measuring the characteristics of recording and reproducingequipment for sound on magnetic tapeFOREWORD1)The formal decisions or agreements of the IEC on technical matters, prepared by Technical Committees on which all theNational Committees having a special interest therein are represented, express, as nearly as possible, an internationalconsensus of opinion on the subjects dealt with.2)They have the form of recommendations for international use and they are accepted by the National Committees in thatsense.3)In order to promote international unification, the I EC expresses the wish that all National Committees should adoptthe text of the IEC recommendation for their national rules in so far as national conditions will permit. Any divergencebetween the I EC recommendation and the corresponding national rules should, as far as possible, be clearly indicatedin the latter.PREFACEThis standard has been prepared by Sub-Committee 60A, Sound Recording, of IEC Technical Committee No. 60,Recording.A first draft was discussed at the meeting held in Paris in 1975. As a result of this meeting, a draft, Document 60A(CentralOffice)43, was submitted to the National Committees for approval under the Six Months' Rule in July 1976.Amendments, Document 60A(Central Office)47, were submitted to the National Committees for approval under theTwo Months' Procedure in September 1977.The following countries voted explicitly in favour of publication:SIST EN 60094-3:1999



7Document60A(Central Office)43Document60A(Central Office)47SpainxxSwedenxxSwitzerlandxxTurkeyxxUnion of SovietSocialist RepublicsxxUnited KingdomxxUnited States of AmericaxxIEC Publication 94 and its supplements are under revision. The new IEC Publication 94 will be issued in severalparts, of which this Part 3 is one.It will have the following parts:Part 1: General conditions and requirementsGeneral; electrical requirements for the magnetic tape recording and reproducing systems; mechanical requirements forthe magnetic tape; tape identification; programme identification (based on IEC Publication 94 [1968], Third edition).Part 2: Calibration tapesMinimum requirements for calibration tape for making adjustments and comparative assessments of the reproducingperformance (First edition 1975).Part 3: Methods of measuring the characteristics of recording and reproducing equipment for sound on magnetic tape (objectof this standard)Part 4: Mechanical magnetic tape propertiesCharacteristics to be specified and relevant methods of measurement. Equipment to be used to determine the mechanicalproperties of magnetic tapes (in preparation).Part 5: Electrical magnetic tape propertiesCharacteristics to be specified, methods of measurement and equipment to be used for the determination of the electricalproperties of magnetic tape for analogue sound recording and reproduction (in preparation).Part 6: Reel-to-reel systemsMechanical requirements and dimensions, including reels, hubs and relevant track allocations (in preparation).Part 7: Cassette for commercial tape records and domestic useMechanical requirements and dimensions, including track allocation (in preparation, based on IEC Publication 94A,First edition 1972).Part 8: Eight-track magnetic tape cartridge for commercial tape records and domestic useMechanical requirements and dimensions, including track allocation (in preparation, based on IEC Publication 94B,First edition 1974).Part 9: Magnetic tape cartridge for professional useMechanical requirements and dimensions, including track allocation (in preparation).Other IEC publications quoted in this standard:Publications Nos. 38:IEC Standard Voltages.65:Safety Requirements for Mains Operated Electronic and Related Apparatus for Householdand Similar General Use.263:Scales and Sizes for Plotting Frequency Characteristics and Polar Diagrams.268-1: Sound System Equipment, Part 1: General.268-3: Part 3: Sound System Amplifiers.268-15: Part 15: Preferred Matching Values for the Interconnection of Sound System Components.386:Method of Measurement of Speed Fluctuations in Sound Recording and ReproducingEquipment.651:Sound Level Meters.SIST EN 60094-3:1999



-9—MAGNETIC TAPE SOUND RECORDING AND REPRODUCING SYSTEMSPart 3 : Methods of measuring the characteristics of recording and reproducingequipment for sound on magnetic tapeSECTION ONE — INTRODUCTION1.ScopeThis standard applies to recording and reproducing equipment for sound on magnetic tape(reel-to-reel, cassette and cartridge) for both professional and domestic applications, and will bereferred to as "equipment" throughout this standard.This standard does not apply to special purpose equipment such as high speed duplicators,artificial reverberation recorders or dictation machines not employing the reel-to-reel, cassette orcartridge principle. This standard excludes all aspects of safety, which are to be found in I E CPublication 65, Safety Requirements for Mains Operated Electronic and Related Apparatus forHousehold and Similar General Use. It also excludes magnetic tape properties, which are to befound in IEC Publications 94-4 and 94-5 (in preparation).2.ObjectThe object of this standard is to list and define parameters affecting the performance of recordingand reproducing equipment for sound on magnetic tape, and to establish conditions and agreedmethods of measurement of these parameters.SECTION TWO — GENERAL NOTES ON MEASUREMENTS3.Information to be supplied by manufacturer of equipmentThe information required is listed in this section. It falls into two distinct categories:—mandatory information to be clearly shown on the equipment, indicated by an "A" on theright-hand side of the page;—optional information to be given separately, e.g. in an instruction manual relating to and suppliedwith the equipment.It is essential that mandatory information outside the scope of this standard (e.g. aspects ofsafety — IEC Publication 65) shall also be given in the correct location.4. IdentificationName of manufacturer or supplierCountry of manufactureModel or type number (variants, if any, to be stated)AASIST EN 60094-3:1999



— 11 —5.Technical descriptionAll parameters in this clause are subject to verification only. For the purpose of this clause, an"adjustable" control shall be deemed to be one that is readily accessible to the user when the equip-ment is in its intended use. Its adjustment shall necessitate neither relocation of the equipment northe dismantling of any of its parts.6.Mechanical characteristics6.1 Space and support requirements during operation of equipmentCharacteristicsUnitsMinimum heightmmMinimum widthmmMinimum depthmmOperating positionhorizontal, vertical or otherTotal masskg6.2 Tape carrier and tapeUnitsType of tape carrier (e.g. cassette, cartridgeor reel-to-reel)Type of reel (e.g. Type II)Maximum reel diameter without overhangmmMaximum reel diameter with overhangmmTape widthmm6.3 Tape transport systemUnitRated speed(s)cm/sANote. — On multispeed equipment, the speeds may be marked with the first two digits of the rated speed, e.g. therated speed of 9.53 cm/s may be shown as "9.5". For single-speed cassette and cartridge equipment, thespeed need not be marked on the equipment but shall be stated in the instruction manual.Adjustable tape speed on:Record/reproduce.Fast forward.Rewind.Adjustable tape tension:Between capstans.On supply reel.On take-up reel.Number of motors.Type of capstan (e.g. single or multiple capstan).Reversible tape drive (record/reproduce).Type of capstan drive motor(s).SIST EN 60094-3:1999



— 13 —Special facilities:Automatic stop.Automatic reverse.Remote start.Remote stop.Cueing/Pause device.Remote fast forward.Remote fast reverse.Adjustable tape path.Capstan drive motor(s) synchronizable to electric power supply frequency.6.4 Tape headsCombined or separate erase/record/reproduce heads.Combined or separate bias heads.Adjustable azimuth.Adjustable zenith.Adjustable track alignment.Number of tracks.Maximum number of tracks on intended tape width.Magnetic head material.7.Electrical characteristics7.1 Reproducing dataMaximum number of simultaneous reproducing channels.Number of reproducing channels.Reproducing characteristic(s) (e.g. I E C).Adjustable gain.Adjustable balance.Adjustable equalization.Type of noise reduction system.Automatic gain control.7.2 Recording dataMaximum number of simultaneous recording channels.Number of recording channels.Adjustable gain.Adjustable balance.Adjustable equalization.Type of noise reduction system.Automatic gain control.Adjustable bias current.8.Rated conditionsFor convenience in specifying how tape recorders are to be set up for measurement or verification,it is necessary to define certain rated conditions under which measurements shall be made. Further-more, some of these rated conditions must be related to a specified calibration or reference tape.SIST EN 60094-3:1999



— 15 —The following ratings are basic to the methods of measurement specified in this standard:Rated environmental conditions.Rated power supply.Rated recording level.Rated load impedance.Rated source impedance.Rated input electromotive force (e.m.f.).Rated output voltage.Rated bias setting.To obtain the correct conditions for measurement, the above-mentioned ratings shall be takenfrom the manufacturer's specification. These ratings themselves are not subject to measurement butthey constitute the basis for measuring the other characteristics.In order to achieve maximum interchangeability of equipment from different manufacturers, andin order to simplify the work of testing authorities, it is desirable that rated conditions should bestandardized so far as is possible.For the guidance of equipment manufacturers, preferred values or ranges are given in squarebrackets following each parameter.8.1 Rated environmental conditionsUnitsAmbient temperature20 +15 °CRelative humidity60 ± 15Air pressure 000 ± 10 000 PaMinimum stabilization time of equipment atambient temperature.8.2 Rated power supplyUnitsType of supply(ies) (e.g. a.c.)Agsee IECVolta e sAPublication 38* V Frequency(ies)HzA8.3 Interface dataSpecified calibration tape.Specified reference tape.Manufacturer and identification details of tape housing(cassette and cartridge equipment only).Rated bias setting for specified reference tape.* IEC Standard Voltages.SIST EN 60094-3:1999



— 17 —UnitsRated load impedance(s) R.*S2Rated recording leveldBThe recording level specified by the manufacturer:The level shall be specified in decibels above or below thelevel of the level section of the specified calibration tapedBRated output voltage(s) Uo*VThe r.m.s. output voltage across the rated load impedancewhen reproducing a tape recorded at the rated recordinglevel. This parameter specifies the setting of adjustablereproduce gain controls.Rated source impedance(s) Ri*S2Rated source e.m.f.(s) Ui*mVThe r.m.s. source electromotive force in series with the ratedsource impedance which, when recording at the rated biassetting on the specific reference tape, produces a magnetic.flux identical to the rated recording level.This parameter specifies the setting of adjustable record gaincontrols.9. Performance claimsThe performance claimed shall be based on the equipment operating under the rated conditionsspecified in Clause 8. Unless otherwise specified in Sub-clauses 9.1 or 9.2 (for example maximum orminimum values), a tolerance shall be allocated to each parameter.If a manufacturer claims rated power supply voltage tolerances exceeding ±10%, then the charac-teristics to be specified shall also be stated for the upper and lower limits of these tolerances.If variations in frequency of the rated power supply, within tolerances specified by the manu-facturer, have any significant influence on the characteristics to be specified, then these charac-teristics shall also be stated for the upper and lower limits of the claimed frequency tolerances.If harmonics in a.c. power supply or ripple in a d.c. power supply, within limits specified by themanufacturer, have any significant influence on the characteristics to be specified, then those charac-teristics shall also be stated for the upper limit of the claimed tolerance of harmonic or ripple content.* For preferred values, see IEC Publication 268-15, Sound System Equipment, Part 15: Preferred Matching Valuesfor the Interconnection of Sound System Components.SIST EN 60094-3:1999



Maximum power consumptionVA, W12.1A— 19 —9.1 Mechanical performance claimsFor methods ofmeasurement,Unitssee sub-clausesRecord/reproduce speedcm/s11.1.1Record/reproduce speed drift%11.1.2Record/reproduce speed fluctuation (wow and flutter):%11.1.3maximum weightedmaximum unweightedSteady-state tape tension:11.2— at record/reproduce speed; maximum N, minimum NN— at maximum spooling speed; maximum N,minimum NNMaximum start time to record/reproduce speeds11.3.1Maximum stop time from record/reproduce speeds11.3.2Maximum stop time from maximum spooling speeds11.3.3Maximum fast spooling time for maximum tape lengths11.3.49.2 Electrical performance claims9.2.1 General performanceFor methods ofmeasurement,Unitssee sub-clause9.2.2 Reproducing performanceFor methods ofmeasurement,Unitssee sub-clausesMaximum deviation from flat reproducing response withinspecified frequency range using specified calibration tape.This information should preferably be in graph formGraphor dB12.2.1Signal/noise ratio (electronic noise)12.2.2UnweighteddBWeighteddBOctaveGraphThird-octaveGraphVoltage output level at specified total harmonic distortion(preferably at 1% and 5%)dB12.2.3SIST EN 60094-3:1999



— 21 —For methods ofmeasurement,Unitssee sub-clausesUnbalance of output (for balanced output only)dB12.2.4Output impedance (for all outputs separately)S212.2.5Power output level of equipment with built-in loudspeakeramplifier at specified total harmonic distortion (prefer-ably at 1% and 5%)dB12.2.6Reproduce channel unbalancedB12.2.79.2.3 Overall performanceFor methods ofmeasurement,Unitssee sub-clausesMaximum deviation of overall characteristic from flatreproducing response within specified frequency rangeusing specified reference tape.This information should preferably be in graph formGraphor dB12.3.1Signal/noise ratio using specified reference tape12.3.2UnweighteddBWeighteddBOctaveGraphThird-octaveGraphSeparation between neighbouring tracksdB and/orGraph12.3.3Erasing attenuationdB12.3.4Overall channel unbalancedB12.3.5Third harmonic distortiondB12.3.69.2.4 Recording performanceFor methods ofmeasurement,Unitssee sub-clausesMaximum deviation from specified recording charac-teristics within specified frequency range using specifiedreference tape.This information should preferably be in graph formGraphor dB12.4.1Minimum source e.m.f.V12.4.2Maximum source e.m.f.V12.4.3Unbalance of input (for balanced input only)dB12.4.4Input impedance (Z) (for all inputs separately)S212.4.5SIST EN 60094-3:1999



— 23 —SECTION THREE — PRECAUTIONS TO BE TAKEN DURING MEASUREMENTS10. Conditions of measurement10.1 Unless otherwise stated in the relevant methods of measurement clauses, the rated conditionsspecified in Clause 8 shall strictly apply.10.2 Unless permanently connected, all noise reduction and automatic gain control circuits shall berendered inoperative.Note. — Methods of measurement on equipment with noise reduction and/or automatic gain control circuits areunder consideration.10.3 Performance parameters of the equipment shall be measured either:a)on the equipment as received from the manufacturer, orb)after setting the adjustable controls listed in Clause 5 to give a performance that is as close aspossible to the claimed performance listed in Clause 9.10.4 The testing authority shall:a) report which adjustable controls were set before measurement;b) report any changes or repairs to the equipment, which had to be carried out before performancemeasurements were made;c) report any deviations from the parameters specified in Clause 8;d) ensure that, before measurement is commenced, the test apparatus:1)has reached stability;2)does not load the equipment so as to affect the parameters to be measured;3)shall have an effective sensitivity which is independent of frequency;4)shall have an accuracy which is at least ten times that of the required accuracy of the measure-ments to be made;e) ensure that parts of the equipment near or in contact with the tape are maintained clean anddemagnetized before measurements are made;f) make no changes whatever to the equipment between start and finish of all measurements, unlessspecifically laid down in the relevant methods of measurement clause.10.5 Graphs should be drawn with frequencies in hertz as abscissae on a logarithmic scale, and outputin decibels as ordinates on a linear scale according to the recommendations of IEC Publication 263,Scales and Sizes for Plotting Frequency Characteristics and Polar Diagrams.SIST EN 60094-3:1999



— 25 —SECTION FOUR — METHODS OF MEASUREMENTIt is essential that the provisions specified in Clause 10 be strictly observed, unless otherwisestated.11. Measurement of mechanical parameters11.1 Record/reproduce speedFor a given equipment, it is assumed that its speed characteristics in the record and reproducemodes are identical. For this reason, methods of measurements are given for the determination ofspeed characteristics when the equipment is in the reproduce mode only.Standard record/reproduce (tape) speeds are listed in Part 1 of IEC Publication 94.11.1.1 Mean deviation from standardized reproduce speedThis sub-clause applies only to equipment without an adjustable record/reproduce speed controlunless tested as received from manufacture. The supply and take-up reels should be approximatelyhalf full.DefinitionIf : Av = mean deviation from standardized reproduce speedvm = measured reproduce speedv° = standard reproduce speedAy: vm — v‰ x 100V°Method AThe time taken (t in seconds) for a given length of tape (1 in centimetres) to pass a fixed point onthe equipment in the reproduce mode is measured by means of a timing device. The length I ismeasured with tape under the steady-state tension determined by the method of Sub-clause 11.2.ResultAv. 1/t — l'‰ x 100%v°Method BA tape carrying a sinusoidal signal which, when reproduced at the relevant standard speed, wouldresult in a reproduced frequency f° Hz, is played on the equipment in the reproduce mode.The reproduced frequency fm Hz is measured by means of a digital frequency meter.Note. — It is recommended that Jo = 3 150 Hz.ResultAy: fI"f° f° x 100%Method CA tape provided with visible lines, which are perpendicular to the tape edges and which are spacedat a distance of d cm apart, is played on the equipment in the reproduce mode while being illuminatedby a light source emitting n flashes per second. The length 1 is measured with the tape under theSIST EN 60094-3:1999



— 27 —steady-state tension determined by the method of Sub-clause 11.2. The number of apparent linesper second (KN) passing a fixed point is counted. If the apparent lines move in the direction of tapetravel, N is positive; if they move in the opposite direction, N is negative.It is assumed that the actual line spacing (d) is chosen so that the apparent lines are stationarywhen the tape travels at standard speed. Moreover, for ease of observation, it is desirable that theapparent line spacing, be greater than 0.3 cm. For the given tape speed, the factor K depends on thevalues chosen for n and d.In the following table, n and d are chosen so that the factor K is unity. If other values of n and d(n' and d') have to be used, they should be simple multiples or sub-multiples of n and d. They arerelated to K as follows:Kn x d' n' x d'It should be noted that the apparent line spacing will be inversely proportional to the factor K.Vo(cm/s)50 Hz power supplies60 Hz power suppliesKndnd(flashes/s)(cm)(flashes/s)(cm)76.22000.38102400.3175138.11000.38101200.3175119.05500.3810600.317519.53250.3810300.317514.7612.50.3810150.31751Resultt1 v: N x 100%nNote. — Other methods of measurement are under consideration.11.1.2 Reproduce speed driftDefinitionThe slow variation in speed caused by the simultaneous variation of tape length on the supply andtake-up reels when the equipment is in the reproduce mode.MethodFor the measurement on reel-to-reel equipment, the largest permissible reels shall be used. A fullreel is placed on the supply spindle, and an empty reel is placed on the take-up spindle of the equip-ment. A full track sinusoidal signal at the beginning of the full reel is played in the reproduce mode,and the reproduced frequency, fi Hz, is measured.Supply and take-up reels are then interchanged, and the sinusoidal signal is reproduced again,this time resulting in a reproduced frequency of f2 Hz.Note. — It is recommended that the sinusoidal signal, when reproduced at the relevant standard speed, results in areproduced frequency of 3150 Hz.ResultDrift: 2( fi — f2) x 100%f2Notes 1.— Methods A, B and C of Sub-clause 11.1.1 may also be adapted to measure this parameter.2. — Measurement methods of cassette and cartridge equipment are under consideration.SIST EN 60094-3:1999



— 29 —11.1.3 Reproduce speed fluctuation (wow and flutter)Speed fluctuations are measured and expressed in accordance with the requirements of IECPublication 386, Method of Measurement of Speed Fluctuations in Sound Recording and Repro-ducing Equipment.11.2 Steady-state tape tension (reel-to-reel equipment only)Maximum diameter reels shall be used and measurements taken at the beginning, the middle andthe end of a full supply reel. Measurements shall be taken between supply reel and capstan, capstanand take-up reel, and, where applicable, between capstans. The maximum and minimum valuesof these six (nine where applicable) readings are quoted for reproduced speed and steady-statemaximum spooling speed.DefinitionThe tension of the tape, when it travels at uniform speed.Method AA section of tape from each location specified above is, in turn, passed over an idler roller carriedby a rod connected to a dynamometer, and is pulled out until the included angle of the tape is 120°.The dynamometer is read.Note. — For some designs of dynamometer, the included tape angle need not be 120°.ResultThe dynamometer reading is the steady-state tape tension. Maximum and minimum steady-statetensions are quoted for reproduce speed and for steady-state maximum spooling speed.Note. — Methods of measurement for cassette and cartridge equipment are under consideration.11.3 Maximum start and stop timesFor reel-to-reel equipment, maximum diameter reels shall be used; for cartridge and cassetteequipment, the type of cartridge or cassette and the type of tape shall be specified. Measurementsare taken at the beginning, the middle and the end of a full supply reel. The maximum of thesemeasurements shall be quoted.11.3.1 Maximum start time to record/reproduce speedDefinitionThe maximum time that has elapsed between the operation of the starting device and the tapespeed being increased from zero to a reproduce speed that gives a wow and flutter reading which istwice the steady-state value.MethodA test frequency of 3 150 Hz recorded on the equipment throughout the full reel of tape shall bereproduced on the equipment from the beginning, the middle and the end of the supply reel. Thereproduced test signals shall be fed to a frequency discriminator centred on 3 150 Hz and the outputfrom the discriminator fed to a graphic recorder. The time taken from the operation of the startingdevice to when the trace on the recorder assumes a steady value is noted.SIST EN 60094-3:1999



— 31 —ResultThe maximum time shall be quoted.Note. — The characteristics of the frequency discriminator are under consideration.11.3.2 Maximum stop time from record/reproduce speedDefinitionThe maximum time that has elapsed between the operating of the stopping device and the tapereaching zero speed.MethodWhilst playing at reproduce speed, the stopping device shall be operated. The time taken betweenoperating the stopping device and the tape stopping shall be measured by means of a chronometer.The measurement shall be carried out at the beginning, the middle and the end of a full supply reel.ResultThe maximum time shall be quoted.11.3.3 Maximum stop time for maximum spooling speedDefinitionThe maximum time that has elapsed between the operation of the stopping device and the tapespeed being reduced from maximum spooling speed to zero.MethodWhile spooling the tape at maximum speed, the stopping device shall be operated. The time takenbetween operating the stopping device and the tape stopping shall be measured by means of achronometer. The measurement shall be carried out at the beginning, the middle and the end of atape from a full supply reel. Measurements shall be made in both directions of travel.ResultThe maximum time shall be quoted.11.3.4 Maximum fast spooling timeDefinitionThe maximum time taken for a full maximum diameter reel of a specified tape to be spooled atmaximum speed.MethodFor this measurement, reels of maximum diameter of tape shall be used. The time taken for theentire length of tape to be conveyed from one reel to the other at maximum spooling speed is measuredby means of a chronometer for forward and reverse directions.ResultThe maximum time for the specified tape shall be quoted.SIST EN 60094-3:1999



— 33 —11.4 Track configuration for multi-track headsDefinitionThe correct configuration required to reproduce tapes recorded with the track configurationsspecified in IEC Publication 94 (Parts 6 to 9).MethodA reel of magnetic tape demagnetized by means of a bulk eraser is installed on the equipment undertest. On a definite section of the tape, recording of all necessary tracks is carried out. Recording isaccomplished with rated recorded level specified by a manufacturer of equipment at referencefrequency. Then the recorded section of a tape is developed in suspension of carbonyl iron powder,afterwards position and dimensions of the recorded tracks are measured by means of an instrumentalmicroscope.ResultPosition and dimensions of magnetic track shall correspond to the relevant IEC publications.12. Measurement of electrical parameters12.1. Maximum power consumptionDefinitionThe maximum power that the equipment can draw from the electric supply.MethodThe current (A) taken from the electric supply shall be measured by means of an ammeter to anaccuracy of ±3% when the equipment is operating under maximum voltage and load conditions.ResultMaximum power consumption: I x maximum voltage.For a.c. supplies the result is quoted in voltamperes, for d.c. supplies it is quoted in watts. Themode (e.g. fast sp
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