EN 60244-10-1993 en Methods of Measurement for Radio Transmitters Part 10 Methods of Measurement for Television Transmitters and Transposers Employing Insertion Test Signals《无线电发射.pdf

1、 - m 3404583 OOBbSbL 2YT m EUROPEAN STANDARD EN 60244-10 NORME EUROPENNE EUROPISCHE NORM April 1993 UDC 62 1.397.6: 62 1.31 7 Supersedes HD 236.10 S1 : 1988 Descriptors: Radio transmitters, television, insertion signals, measurements, requirements English version Methods of measurement for radio tra

2、nsmitters Part 10 : Methods of measurement for television transmitters and transposers employing insertion test signals (IEC 244-10 : 1986) Mthodes de mesure applicables aux metteurs radiolectriques Dixime partie : Mthodes de mesure applicables aux metteurs et rmetteurs de tlvision, et utilisant les

3、 signaux dinsertion MeBverfahren fr Funksender %il 10: MeBverfahren fr Fernsehsender und-umsetzer mit Prfzeilensignalen (IEC 244-10 : 1986) (CE1 244-10 : 1986) This European Standard .was approved by CENELEC on 1993-03-09. CENELEC members are bound to comply with the CENKENELEC Internal Regulations

4、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 Europ

5、ean 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 t

6、he 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 Comit Europen de

7、Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Centrai Secretariat: rue de Stassart 35, B-1050 Brussels O 1993 Copyright reserved to CENELEC members Ref. No. EN 60244-10 : 1993 E 3404583 008bSb2 L8b W Page 2 EN 60244-10 : 1993 Foreword At the request of 72nd %chnical

8、 Board, HD 236.10 S1 : 1988 (IEC 244-10 : 1986) was submitted to the CENELEC voting procedure for conveision into a European Standard. The text of the International Standard was approved by CENELEC as EN 60244-10 on 9 March 1993. The folowing dates were fixed: - latest date of publication of an iden

9、tical national standard (dop) 1994-06-01 - latest date of withdrawa of conflicting national standards (dow) - Annexes designated normative are part of the body of the standard. in this standard, annex ZA is normative. = 3404583 0086563 O12 Page 3 EN 60244-10 : 1993 CONTENTS Page INTRODUCTION 4 Claus

10、e 1 . Scope 4 . 2 . Object 4 SECTION ONE . TEST SIGNALS AND LINE SELECTION . 3 . Introduction 4 5 . Line selection 6 6 6 . 4 . Insertion test signals 5 Content of the active picture period SECTION Two . GENERAL CONDITIONS OF MEASUREMENT AND INITIAL ADJUSTMENT OF THE EQUIPMENT 7 . Manual and automati

11、c methods of measurement . 6 8 . Measuring arrangement . 7 9 . Conditions of operation . 7 10 . Adjustment of the VSB demodulator . 7 11 . 12 . 13 . 14 . 15 . 16 . 17 . 18 . 19 . 20 . 21 . 22 . 23 . 24 . 25 . 26 . 27 . SECTION THREE . MEASUREMENT OF PERFORMANCE CHARACTERISTICS Conformity with other

12、standards . Luminance bar amplitude error g Synchronizing pulse amplitude error 9 Luminance bar tilt 10 Base-line distortion . 11 2T pulse/bar ratio error . 11 2T pulse shape distortion 12 Amplitude/video-frequency characteristic 12 Chrominance-luminance gain inequality . 13 Chrominance-luminance de

13、lay inequality 13 Luminance non-linearity 14 Chrominance non-linearity 15 Differential gain . 15 Differential phase 16 Chrominance-luminance cross-talk 16 Random noise at blanking level 17 In-band intermodulation 17 9 BmLImwm 19 20 FIGURES . 27 APPENDIX A . CCIR Recommendation 473-3 41 APPENDIX B .

14、Excerpt of CCIR Recommendation 567-1 45 APPENDIX C . List of references to Reports and Recommendations of the CCIR . . Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications 46 = 3404583 008b5b4 T5 m fige 4 EN 60244-10

15、: 1993 METHODS OF MEASUREMENT FOR RADIO TRANSMITTERS Part 10: Methods of measurement for television transmitters and transposers employing insertion test signals INTRODUCTION This standard is one of a series of parts of IEC Publication 244: Methods of Measurement for Radio Transmitters, describing r

16、ecommended methods of measurement for assessing the performance of radio transmitters. In this standard reference is made to other parts of IEC Publication 244, especially Publication 244-5: Part 5: Measurements Particular to Transmitters and Transposers for Monochrome and Colour Televi- sion, and P

17、ublication 244-9: Part 9: Transposers for Monochrome and Colour Television. 1. scope This standard applies to television transmitters and transposers operating in accordance with television systems for monochrome andcolour transmission employing 625 or 525 lines as described in CCIR publications. Fo

18、r details of the characteristics of the various systems, see the CCIR Report i mentioned in Appendix C. 2. Ob for System L, without taking into account the chrominance sub-carrier. 3, Characteristics of the video signal at the output of the demodulator Uno = nominal value of the luminance bar amplit

19、ude, i.e. the voltage between blanking level and nominal white reference U0 = the value to which the voltage between zero-carrier and blanking level is to be adjusted, so that Uno = U, level, Uso = nominal value of the synchronizing pulse amplitude, Le. the voltage between blanking level and nominal

20、 synchro- nizing level. 4. Insertion test signals A representative range of insertion test signals is shown in Figures 1 to 8. For ease of reference they are indicated by roman numerals. The test signals I to IV for 625-line systems are given in Figures 1 to 4, pages 37 and 38. Figures 5 and 6, page

21、 39, show the test signals V and VI for 525-line systems. The test signals I to VI are based on the CCIR Recommendation reproduced in Appendix A, .to which reference should be made for further details. The test signais VI1 and VI11 are included for the measurement of certain characteristics not incl

22、uded in the CCIR Recommendation. Test signal VII, shown in Figure 7, page 40, is used for measuring the in-band intermodulation products caused by intermodulation between the vision and sound carriers and the sideband component corresponding to the chrominance subcarrier in 625-line equipment, parti

23、cularly for transmitters and transposers employing common amplification of the vision and sound channels. A similar test signal may be used for testing 525-line equipment. m 3404583 008b5bb 821 m Page 6 EN 60244-10 : 1993 Test signal VIII, shown in Figure 8, page 41, comprising a signal at blanking

24、level for the full line interval, is used for measuring noise in 625-line equipment. A similar test signal may be used for testing 525-line equipment. 5. Line selection For out-of-programme service tests, the test signals may be, in principle, inserted in any line in For tests during programme servi

25、ce, the lines selected for the test signals should be in accordance the field-blanking interval. with relevant CCIR Recommendations and Reports (see Appendix C, reference (41). 6. Content of the active picture period It is assumed that all insertion test signals are simultaneously present on the sel

26、ected lines of the field-blanking interval. Because the measurement result may depend on the picture content of the other lines, the average signal level during in-programme measurements shall be stated in the presentation of results. Out-of-programme measurements may be made for different values of

27、 average picture level with the luminance level of the active picture lines successively adjusted to correspond to an “all-black picture” and an “all-white picture”, and, if required, also to a “mid-grey picture”. This shall also be stated in the presentation of results. SECTION TWO - GENERAL CONDIT

28、IONS OF MEASUREMENT AND INITIAL ADJUSTMENT OF THE EQUIPMENT 7. Manual and automatic methods of measurement Measurements with insertion test signals can be made either “manually” by means of discrete items of test equipment, such as an oscilloscope, noise meter, etc., or “automatically” by using an i

29、nsertion test signal analyzer. The analyzer continually scans sequentially the selected performance characteristics and may provide a digital read-out and give an indication when the measured values exceed a predetermined threshold (for example, see the CCIR Reports 5 and 6 mentioned in Appendix C).

30、 The advantages of the automatic method include: - reduction of measuring time, - greater measurement accuracy for most characteristics, - the possibility of recording on paper or tape. Except where a distinction is made in particular clauses between manual and automatic methods of measurement, the

31、measurement procedures given in this standard are valid for both methods. However, although in the case of automatic measurements the procedure is carried out automati- cally by the insertion test signal analyzer, the various steps are described as if they were performed manually. When an automatic

32、method of measurement is used, the analyzer will indicate the mean value of the Characteristic measured and the presentation of results shail state the period over which the results are averaged. m 3404583 0086567 768 m Page 7 EN 60244-10 : 1993 8. Measuring arrangement The measuring arrangement sho

33、wn in Figure 9, page 42, comprises the following items of equip- ment: - For out-of-programme tests, a video test signal generator capable of delivering a composite video signal, including the colour burst, in accordance with the television standard concerned. - An insertion test signal generator, c

34、apable of delivering the insertion test signals given in Clause 4 - A vestigial-sideband (VSB) demodulator provided with “zero-carrier reference”, preferably of above. the type employing switchable synchronous/envelope detection. Envelope detection should preferably be used for the measurement of di

35、fferential phase. If envelope detection is also used for the measurement of other characteristics, any errors due to quadrature distortion should be taken into account (for example, see the CCIR Report 7 men- tioned in Appendix C). - An insertion test signal analyzer for the automatic method of meas

36、urement, or an oscilloscope with line selector for the manual method of measurement. - In addition, for the measurement of transposers, a test transmitter capable of delivering mod- ulated vision and sound signals in accordance with the television standard concerned. In this case, the overall perfor

37、mance of the combination of test transmitter and demodulator, excluding the transposer, must be known and allowed for. See, for example, PODEMSKI and also Part E of the CCIR Recommendation 2 mentioned in Appendix C. 9. Conditions of operation The transmitter or transposer shall be set up to its rate

38、d output conditions and tested under the general conditions of operation appropriate to the equipment concerned in accordance with I E C Publication 244-5 or 244-9. 10. Adjustment of the VSB demodulator 10.1 Introduction Insertion test signal analyzers are normally calibrated for measurements on a c

39、omposite video signal of standard level in video distribution networks, for example the signal at the input of a transmitter. The reference voltage employed for all measurements is that voltage corresponding to the nominal value of the luminance bar (or picture) amplitude of the video signal, i.e. 7

40、14 mV for Systems M and N and 700 mV for all other systems. If the analyzer is used for the measurement of the signal at the output of a demodulator, the latter shall be adjusted as set out in Sub-clause 10.2 below, so that the voltage between blanking level and nominal white reference level at the

41、demodulator output is equal to the reference voltage, Le. the nominal luminance bar amplitude at the transmitter input. As, unless otherwise stated, the measurement procedures given in this standard are applicable to both automatic and manual methods of measurement, the adjustment procedure describe

42、d in Sub- clause 10.2 shall also be used in the latter case. 3404583 0086568 bT4 Page 8 EN 60244-10 : 1993 10.2 Adjustment procedure The procedure described below applies both to systems employing positive modulation and also to systems employing negative modulation of the vision signal. a) Connect

43、the output of the VSB demodulator to an oscilloscope. b) Set the video test signal generator to provide an “all black” picture. c) By means of the “zero-carrier reference” of the demodulator and its output level control, adjust the voltage between blanking level and zero-carrier to the value of U. g

44、iven in Table I for the television standard concerned or to the value calculated from the formula 10.3a given below. 10.3 Example of calculation of U. and of demodulator output signai waveform and blanking level stated in the CCIR Report i mentioned in Appendix C. The values of U0 shown in Table I a

45、re based on the nominal values, di and d2, of peak white level In the case of an equipment specification requiring another value of di and/or - blanking level coincides with the horizontal axis through level reference point “0%” of the - the peak of the 2T pulse falls on the horizontal line through

46、level reference point “100%”; graticule; - the half-amplitude points of the 2T pulse are symmetrically disposed about the vertical axis c) State whether the waveform is within the specified K-rating tolerance, or state the measured through time reference point “O”. . K-rating factor. 17.3 Measuremen

47、t procedure for an automatic method of measurement This sub-clause is still under consideration because at the present time the results of automatic methods of measurement do not correspond with those obtained by manual methods. 18. 18.1 18.2 Ampiitudehideo-frequency characteristic Introduction The

48、amplitudehideo frequency characteristic is determined by measuring the ratio between (1) the peak-to-peak amplitude of each sine-wave signal at the different video frequencies in section C2 of the demodulated test signal II or VI and (2) the peak-to-peak amplitude of the reference luminance signal i

49、n section Cl when test signal II is used, or half the peak-to-peak amplitude when test signal VI is used. luminance signal. Alternatively, the luminance bar in section B2 of test signals I or V may be taken as the reference Measurement procedure a) Select test signal II for 625-line systems or test signai VI for 525-line systems. b) Measure the peak-to-peak amplitude UCi between the midduration points of the reference luminance signal in section CI. c) Measure the peak-to-peak amplitude Uc2 at the mid-duration point of each sine-wave signal i