BS-EN-61237-3-1995 IEC-61237-3-1995.pdf

BRITISH STANDARD BS EN 61237-3:1995 IEC 1237-3: 1995 (Incorporating corrigendum April 1995) Broadcast video tape recorders Methods of measurement Part 3: Electrical measurements for analogue component video signals The European Standard EN 61237-3:1995 has the status of a British Standard Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:27:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61237-3:1995 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 November 1995 © BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference EPL/60 Draft for comment 91/03063 DC ISBN 0 580 24679 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee EPL/60, Recording, upon which the following bodies were represented: Association of Professional Recording Services Limited Audio Engineering Society British Broadcasting Corporation British Kinematograph, Sound and Television Society British Tape Industry Association Federation of the Electronics Industry ITV Association (ITVA) National Council for Educational Technology (NCET) Royal Photographic Society Royal Television Society Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:27:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61237-3:1995 © BSI 11-1999i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN 61237-35 List of referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:27:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61237-3:1995 ii © BSI 11-1999 National foreword This British Standard has been prepared by Technical Committee and is the English language version of EN 61237-3:1995 Broadcast video tape recorders Methods of measurement Part 3: Electrical measurements for analogue component video signals, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 1237-3:1995 including the corrigendum of April 1995, published by the International Electrotechnical Commission (IEC). It is envisaged that BS EN 61237 will consist of the following parts: Part 1: Mechanical measurements; Part 2: Electrical measurements of analogue component video signals; Part 3: Electrical measurements of analogue component video signals; Part 4: Measurements of audio performance; Part 5: Electrical measurements of digital composite video signals and digital audio signals; Part 6: Electrical measurements of digital component video signals and digital audio signals. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International StandardCorresponding British Standard EN 60961:1994 (IEC 961:1993) BS EN 60961:1994 Specification for helical-scan video tape cassette system using 12.65 mm (0.5 in) magnetic tape on type L EN 61105:1993 (IEC 1105:1991) BS EN 61105:1994 Specification for reference tapes for video tape recorder systems HD 439 S1:1983 (IEC 698:1981) BS 6311:1982 Methods for measuring television tape machine parameters Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 32, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:27:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 61237-3 February 1995 UDC 621.397.452:621.317.08 Descriptors: Electroacoustics, video recording, recording apparatus, video tape recorders, radiocommunications, electrical measurements, video signals, analogue signals English version Broadcast video tape recorders Methods of measurement Part 3: Electrical measurements for analogue component video signals (IEC 1237-3:1995) Magnétocopes de radiodiffusion Méthodes de mesure Partie 3: Mesures électriques pour les signaux vidéo analogiques à composantes (CEI 1237-3:1995) Videobandgeräte für den Rundfunk Meßverfahren Teil 3: Elekrische Messungen für Videosignale mit analogen Komponenten (IEC 1237-3:1995) This European Standard was approved by CENELEC on 1994-03-08. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels © 1995 Copyright reserved to CENELEC members Ref. No. EN 61237-3:1995 E Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:27:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61237-3:1995 © BSI 11-1999 2 Foreword The text of document 60B(CO)160 + 160A, future edition 1 of IEC 1237-3, prepared by SC 60B, Video recording, of IEC TC 60, Recording, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61237-3 on 1994-03-08. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. Annexes designated “informative” are given for information only. In this standard, Annex ZA is normative and Annex A is informative. Annex ZA has been added by CENELEC. latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement(dop) 1996-02-01 latest date by which the national standards conflicting with the EN have to be withdrawn(dow) 1996-02-01 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:27:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61237-3:1995 © BSI 11-19993 Contents Page Foreword2 1Scope and object5 2Normative references5 3General5 4Test conditions6 5Measuring methods and test signals6 5.1Manual and automatic methods of measurement6 5.2Measurement of differences between adjacent tracks (fields/segments)6 5.3Procedure of measurement6 5.4Test signals6 6Measurement of characteristics8 6.1Luminance bar amplitude error8 6.2Synchronizing pulse amplitude error8 6.3Bar tilt9 6.4Pulse/bar ratio error9 6.5Pulse shape distortion10 6.6Amplitude/video-frequency characteristic10 6.7Chrominance-luminance gain inequality11 6.8Chrominance-luminance delay inequality11 6.9Line-time non-linearity12 6.10 High-frequency non-linearity12 6.11 High-frequency intermodulation13 6.12 Crosstalk between channels13 6.13 Luminance random noise14 6.14 Chrominance random noise15 6.15 Group delay15 6.16 FM characteristic frequencies15 6.17 Jitter16 6.18 Velocity errors17 6.19 Moiré18 6.20 Noise reduction18 6.21 Coder alignment18 6.22 Power-supply interference18 Annex A (informative) Bibliography32 Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications32 Page Figure 1 Test signal I: Waveform of video signals for 100/0/100/0 colour bars19 Figure 2 Test signal II: five-riser staircase signals for the luminance a) and chrominance b) channels20 Figure 3 Test signal III: Full-amplitude sawtooth signals for line-time non-linearity and signal-to-randoms noise measurements in the luminance a) and chrominance b) channels21 Figure 4 Test signal IV: Multiburst test signals for the luminance channel a) and the colour-difference channels b)22 Figure 5 Test signal V: Line-rate sweep signal with 60 % of full amplitude and approximately 6 MHz upper frequency limit in luminance a) and 3 MHz in chrominance channels b)23 Figure 6 Test signal VI: Pulse and bar signal elements for measurements in the luminance channel a) and colour-difference channels b)24 Figure 7 Test signal VII: Multipulse signal for luminance channel a) and chrominance channel b); T = 100 ns25 Figure 8 Test signal VIII: Sinusoid signal for colour-difference/luminance delay and gain measurements26 Figure 9 Test signal IX: Noise-coring measurement in luminance a) and colour-difference b) channels27 Figure 10 Test signal X: Test signals for measurement of HF non-linearity and HF intermodulation28 Figure 11 Example of oscilloscope graticule for the measurement of 2T and 5T pulse-shape distortion29 Figure 12 Example of high-frequency intermodulation measured with test signal X30 Figure 13 Measurement of group delay from the shape of a 20T or 40T pulse of test signal VII31 Table 1 Nominal signal amplitudes for 625-line and 525-line standards7 Table 2 Signal arrangements and parameters for crosstalk measurements14 Table 3 Test signals for measurement of FM characteristic frequencies16 Table 4 Trigger slope and measuring slope for measurement of jitter between channels using test signal I17 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:27:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 blank Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:27:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61237-3:1995 © BSI 11-19995 1 Scope and object This part of IEC 1237 describes the test signals and measurement methods for equipment mainly dedicated to record/playback of analogue component TV signals on magnetic tape on reels or in cassettes. It may also be applied for measuring methods for general use in television production and transmission. The allowable tolerances for the rated values for acceptable performance are not given in this standard, but may be derived from appropriate system specifications, manufacturers specifications, etc. The necessary reference and calibration tapes are either mentioned in the specific IEC Publication of the equipment under test or included in IEC 1105 (reference tapes) and IEC technical report 1295 (calibration tapes) 11). The methods are applicable to acceptance tests, performance comparisons and, as far as possible, to routine checks. The principal object of this document is to describe the methods of measurement, test signals and procedures which may apply to characteristics of video recording/playback machines mainly intended for professional use. The measuring methods described hereafter do not directly concern home equipment and it would appear that some will be difficult to apply to them. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 1237. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of IEC 1237 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 961:1993, Helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic tape on type L. IEC 1105:1991, Reference tapes for video tape recorder systems. ITU-R Recommendation 471-1:1990, Nomenclature and description of colour bar signals. (Vol. XI-1) ITU-R Recommendation 567-3:1990, Transmission performance of television circuits designed for use in international connections. (Vol. XII) ITU-R Recommendation 601-2:1990, Encoding parameters of digital television for studios. (Vol. XI-1) ITU-R Recommendation 656:1986, Interfaces for digital component video signals in 525-line and 625-line television systems. (Vol. XI-1) 3 General To ensure that the results obtained at a specific time at a specific place are comparable to other measurements, it is advisable to specify the test signals, measuring devices and types of tapes used together with results obtained. Since measurements of television tape machines on the basis of a single test-line per field may not be fully representative of the full-field performance (see 5.1 and 5.2), they may give results which differ from those obtained or calculated with full-field test signals. Therefore it is necessary to additionally specify the measuring method: single line measurement (line number); block measurement (start-line, step-by-step line(s), number of steps); full-field measurement. Additionally, it should be stated if the selection of lines coincides with a single record/playback head only. 1) Figures in square brackets refer to Annex A, Bibliography. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:27:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61237-3:1995 6 © BSI 11-1999 4 Test conditions If not otherwise stated all measurements shall be carried out at the following atmospheric conditions: 5 Measuring methods and test signals 5.1 Manual and automatic methods of measurement If automatic measuring apparatus is designed to give reliable results under the special conditions of television tape playback as e.g. drop-out, jitter, noise, time-base errors, suppression of vertical blanking interval or insufficient head-to-tape contact, a significant improvement in measurement speed, accuracy and comparability of results can be achieved. Therefore preference was given to measurement methods which can be carried out by automatic measuring equipment or which are suitable for automatic measuring techniques. Except where a distinction is made in particular clauses between manual and automatic methods of measurement, the measurement procedures given in this standard are valid for both methods. However, although in the case of automatic measurements the procedure is carried out automatically by the test signal analyzer, the various steps are described as if they were performed manually. 5.2 Measurement of differences between adjacent tracks (fields/segments) All currently standardized recording formats make use of segmented recording techniques. The length of the segments (tracks) varies between approximately 16