SIST EN 60244-10:1999

Methods of measurement for radio transmitters -- Part 10: Methods of measurement for television transmitters and transposers employing insertion test signals

Applies to television transmitters and transposers operating in accordance with television systems for monochrome and colour transmission employing 625 or 525 lines as described in CCIR publications. Deals with the application of insertion test signal measurement to television transmitters and transposers. This method of measurement is useful for checking the line time performance of the transmitters or transposers during programme service and provides a convenient method of testing transmission performance stability during acceptance tests. May also be used as an alternative means of carrying out some of the line time measurements described in EN 60244-5 and 60244-9.

Meßverfahren für Funksender -- Teil 10: Meßverfahren für Fernsehsender und -umsetzer mit Prüfzeilensignalen

Méthodes de mesure applicables aux émetteurs radioélectriques -- Partie 10: Méthodes de mesure applicables aux émetteurs et réémetteurs de télévision, et utilisant les signaux d'insertion

S'applique aux émetteurs et réémetteurs de télévision qui fonctionnent conformément aux normes utilisées par la télévision en noir et blanc, et en couleur, à 525 ou 625 lignes, décrites dans les publications du CCIR. Traite de l'application, aux émetteurs et réémetteurs de télévision, de la méthode utilisant les signaux d'insertion. Cette méthode est utile pour le contrôle de la qualité de l'émission d'un émetteur ou d'un réémetteur pendant la transmission d'un programme et constitue une méthode pratique d'essai de la qualité de transmission pendant les essais de recette. Peut également remplacer certaines méthodes pour mesurer certaines caractéristiques de durée de ligne, décrites dans les EN 60244-5 et 60244-9.

Methods of measurement for radio transmitters - Part 10: Methods of measurement for television transmitters and transposers employing (IEC 60244-10:1986)

General Information

• Status: Published
• Publication Date: 31-Dec-1998
• ICS: 33.060.20 - Receiving and transmitting equipment
• Technical Committee: RZV - Radiocommunication
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jan-1999
• Due Date: 01-Jan-1999
• Completion Date: 01-Jan-1999
• Ref Project: EN 60244-10:1993 - Methods of measurement for radio transmitters - Part 10: Methods of measurement for television transmitters and transposers employing insertion test signals

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 60244-10:1999
01-januar-1999
Methods of measurement for radio transmitters - Part 10: Methods of
measurement for television transmitters and transposers employing (IEC 60244-
10:1986)
Methods of measurement for radio transmitters -- Part 10: Methods of measurement for
television transmitters and transposers employing insertion test signals
Meßverfahren für Funksender -- Teil 10: Meßverfahren für Fernsehsender und -umsetzer
mit Prüfzeilensignalen
Méthodes de mesure applicables aux émetteurs radioélectriques -- Partie 10: Méthodes
de mesure applicables aux émetteurs et réémetteurs de télévision, et utilisant les
signaux d'insertion
Ta slovenski standard je istoveten z: EN 60244-10:1993
ICS:
33.060.20 Sprejemna in oddajna Receiving and transmitting
oprema equipment
SIST EN 60244-10:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 60244-10:1999

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SIST EN 60244-10:1999

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SIST EN 60244-10:1999

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SIST EN 60244-10:1999

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SIST EN 60244-10:1999

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SIST EN 60244-10:1999
NORME CEI
INTERNATIONALE IEC
60244-10
INTERNATIONAL
Première édition
STAN DARD
First edition
1986-01
Méthodes de mesure applicables aux
émetteurs radioélectriques
Dixième partie:
Méthodes de mesure applicables aux émetteurs et
réémetteurs de télévision, et utilisant les signaux
d'insertion
Methods of measurement for radio transmitters
Part 10:
Methods of measurement for television
transmitters and transposers employing
insertion test signals
© IEC 1986 Droits réservés
de reproduction — Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque forme que ce soit et par aucun any form or by any means, electronic or mechanical,
procédé, électronique ou mécanique, y compris la photo- including photocopying and microfilm, without permission in
copie et les microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: [phone] e-mail: [e-mail] IEC web site http: //www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
X
PRICE CODE
International Electrotechnical Commission
IEC
McH Pour prix, voir catalogue en vigueur
• For price, see current catalogue

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SIST EN 60244-10:1999
244-10 © I E C 1986 — 3 —
CONTENTS
Page
5
FOREWORD
PREFACE 5
7
INTRODUCTION
Clause
1. Scope 7
Object 7
2.
SECTION ONE — TEST SIGNALS AND LINE SELECTION
3. Introduction 7
4. Insertion test signals 9
11
5. Line selection
Content of the active picture period 11
6.
SECTION Two - GENERAL CONDITIONS OF MEASUREMENT AND INITIAL ADJUSTMENT OF THE EQUIPMENT
7. Manual and automatic methods of measurement 11
13
8. Measuring arrangement
13
9. Conditions of operation
13
10. Adjustment of the VSB demodulator
SECTION THREE — MEASUREMENT OF PERFORMANCE CHARACTERISTICS
11. Conformity with other standards 17
12. Luminance bar amplitude error 17
17
13. Synchronizing pulse amplitude error
14. Luminance bar tilt 19
21
15. Base-line distortion
21
16. 2T pulse/bar ratio error
17. 2T pulse shape distortion 23
18. Amplitude/video-frequency characteristic 23
25
19. Chrominance-luminance gain inequality
20. Chrominance-luminance delay inequality 25
27
21. Luminance non-linearity
29
22. Chrominance non-linearity
29
23. Differential gain
31
24. Differential phase
25. Chrominance-luminance cross-talk 31
33
26. Random noise at blanking level
27. In-band intermodulation 33
BIBLIOGRAPHY 36
FIGURES 37
APPENDIX A - CCIR Recommendation 473-3 45
APPENDIX B - Excerpt of CCIR Recommendation 567-1 73
APPENDIX C - List of references to Reports and Recommendations of the CCIR 81

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SIST EN 60244-10:1999
244-10 © I E C 1986 — 5 —
INTERNATIONAL ELECTROTECHNICAL COMMISSION
METHODS OF MEASUREMENT
FOR RADIO TRANSMITTERS
Part 10: Methods of measurement for television transmitters and transposers
employing insertion test signals
FOREWORD
1) The formal decisions or agreements of the IEC on technical matters, prepared by Technical Committees on which all the
National Committees having a special interest therein are represented, express, as nearly as possible, an international consensus
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 that sense.
3) In order to promote international unification, the IEC expresses the wish that all National Committees should adopt the text of
the IEC recommendation for their national rules in so far as national conditions will permit. Any divergence between the I E C
recommendation and the corresponding national rules should, as far as possible, be clearly indicated in the latter.
PREFACE
This standard has been prepared by Sub-Committee 12C: Transmitting Equipment, of I E C Technical
Committee No. 12: Radiocommunications.
The text of this standard is based upon the following documents:
Six Months' Rule Report on Voting
12C(CO)171 12C(CO)179
Further information can be found in the Report on Voting indicated in the table above.
The following IEC publications are quoted in this standard:

Publications Nos. 244: Methods of Measurement for Radio Transmitters.
244-5 (1971): Part 5: Measurements Particular to Transmitters and Transposers for Monochrome and
Colour Television.
244-5B (1975): Second Supplement to Publication 244-5. Sections Five and Six.
Amendment No. 1 (1978).
244-5C (1977): Third Supplement to Publication 244-5. Section Seven - Unwanted Modulation, Including
Hum, Noise and Intermodulation.
244-9 (1982): Part 9: Transposers for Monochrome and Colour Television.

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SIST EN 60244-10:1999
— 7 —
244-10 © I E C 1986
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 I E C Publication 244: Methods of Measurement for Radio
Transmitters, describing recommended methods of measurement for assessing the performance of radio
transmitters.
In this standard reference is made to other parts of I E C Publication 244, especially Publication 244-5:
Part 5: Measurements Particular to Transmitters and Transposers for Monochrome and Colour Televi-
sion, and Publication 244-9: Part 9: Transposers for Monochrome and Colour Television.
For the titles of other parts of Publication 244, refer to the inside of the back cover of this publication.
1. Scope
This standard applies to television transmitters and transposers operating in accordance with
television systems for monochrome and colour transmission employing 625 or 525 lines as described
in CCIR publications. For details of the characteristics of the various systems, see the CCIR
Report [1] mentioned in Appendix C.
2. Object
This standard deals with the application of insertion test signal measurement to television trans-
mitters and transposers.
This method of measurement is useful for checking the line time performance of the transmitters
or transposers during programme service and provides a convenient method of testing transmis-
sion performance stability during acceptance tests. It may also be used as an alternative means of
carrying out some of the line time measurements as described in I E C Publication 244-5 or 244-9
(including supplements).
SECTION ONE - TEST SIGNALS AND LINE SELECTION
3. Introduction
Test signals inserted on selected lines in the field-blanking interval of the composite video sign al
are termed "insertion test signals" and may be inserted by an appropriate instrument, for example
an insertion test signal generator.

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TABLE I
Characteristics of the video signals at the transmitter input and demodulator output for different
television standards
625-line systems 525-line systems
Un= 700mV Un= 714mV
Us =300mV 1) Us=286mV1)
B, G, H, K 1 D,K I L M,N
S (%) 10 12.5 or 15 20 100 10
1
82
%)2) 75 75 76 30 75
(
U0 (mV) 808 840 or 875 950 300 824
3)
(mV) 700 700 700 700 714
Lino
Uso (mV) 269 275
280 or 292 300 300
1) Characteristics of the video signal at the input of the (test) transmitter
Un= nominal value of the luminance bar amplitude,
U, = nominal value of the synchronizing pulse amplitude.
2) Characteristics of the vision signal at the output of the transmitter (or transposer)
S l = nominal peak white level in percentage of peak carrier*,
62 = nominal blanking level in percentage of peak carrier*.
* In accordance with the CCIR Report [1] mentioned in Appendix C; for System L, without taking into account the
chrominance sub-carrier.
3) Characteristics of the video signal at the output of the demodulator
U„o = nominal value of the luminance bar amplitude, i.e. the voltage between blanking level and nominal white reference
level,
U0 = the value to which the voltage between zero-carrier and blanking level is to be adjusted, so that U„o = U,,,
Uso = nominal value of the synchronizing pulse amplitude, i.e. the voltage between blanking level and nominal 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 Ito IV for 625-line systems are given in Figures 1 to 4, pages 37 and 38.
Figures 5 and 6, page 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 signals VII and VIII are included for the measurement of certain characteristics not
included 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, particularly 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.

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SIST EN 60244-10:1999
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Test signal VIII, shown in Figure 8, page 41, comprising a signal at blanking 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
the field-blanking interval.
For tests during programme service, the lines selected for the test signals should be in accordance
with relevant CCIR Recommendations and Reports (see Appendix C, reference [4]).
Content of the active picture period
6.
It is assumed that all insertion test signals are simultaneously present on the selected 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 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 CONDITIONS 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
insertion 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).
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 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 method of measurement is used, the analyzer will indicate the mean value of
the characteristic measured and the presentation of results shall state the period over which the
results are averaged.

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SIST EN 60244-10:1999
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E C 1986
8. Measuring arrangement
The measuring arrangement shown 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, capable of delivering the insertion test signals given in Clause 4
above.
- A vestigial-sideband (VSB) demodulator provided with "zero-carrier reference", preferably of
the type employing switchable synchronous/envelope detection.
Envelope detection should preferably be used for the measurement of differential phase. If
envelope detection is also used for the measurement of other characteristics, any errors due to
[7]
quadrature distortion should be taken into account (for example, see the CCIR Report men-
tioned in Appendix C).
- An insertion test signal analyzer for the automatic method of measurement, 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 performance 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 rated 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 composite 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. 714 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 demodulator output is equal to the reference voltage, i. e. 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 described in Sub-
clause 10.2 shall also be used in the latter case.

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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 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 Uo given 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 Uo and of demodulator output signal waveform
The values of U0 shown in Table I are based on the nominal values, CS and V2, of peak white level
I
and blanking level stated in the CCIR Report [1] mentioned in Appendix C.
In the case of an equipment specification requiring another value of ô 1 and/or 82 within the
tolerances stated in the CCIR Report, the value of U 0 shall be calculated from the formula:
a2
(10.3 a)
Uo = a Un
_ 61
U
where n is the nominal value of the luminance bar amplitude.
The nominal value of the synchronizing pulse amplitude at the demodulator output is equal to:
100 -(S L)n
2
(10.3b)
Uso=
S^
82 —
For example, substituting 8 1 = 10%, (52 73% and U = 700 mV yields Uo = 811 mV and
= n
Uso = 300 mV, and results in the demodulator output signal waveform shown in the figure below
for a television transmitter with negative modulation, which is adjusted in accordance with Sub-
clause 10.2 above and shows a slight synchronizing pulse amplitude error.
(mV)
(%)
Zero carrier level
811
0– (Uo)
(S 1
) 10- 700 (1.40 = U„)
White reference level
(nominal value)
--Zero carrier reference pulse
Blanking level
(b2) 73
Synchronizing level
(nominal value)
300
100 — - Ws()
413/85
Note. - Except for Systems I and L, the values of S I and (52 given in Table I result in the nominal amplitude, U so, of the
s
synchronizing pulse at the demodulator output to be different from the nominal value U at the transmitter input
(i.e. 300 mV for all systems, except Systems M and N where U s = 284 mV).
In the case of automatic methods of measurement, this will give rise to a synchronizing pulse amplitude error which
is also present when the amplitude of the synchronizing pulse is correct. This fixed error may be taken into account
by calculating the actual error in accordance with Item d) of Sub-clause 13.2.

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SIST EN 60244-10:1999
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SECTION THREE - MEASUREMENT OF PERFORMANCE CHARACTERISTICS
11. Conformity with other standards
In this standard the definition of each performance characteristic to be measured by a particular
test signal is given in the introduction to each measurement procedure. Generally these definitions
are in accordance with CCIR Recommendations, for example, reference [3] of Appendix C. In some
instances indicated by a note accompanying the particular introduction, the characteristics are also
defined in I E C Publications 244-5 and 244-9. The note will explain any divergencies between the
definitions and the measurement results obtained.
12. Luminance bar amplitude error
12.1 Introduction
The luminance bar amplitude error is the difference between the actual luminance bar amplitude
and its nominal value, expressed as a percentage of the nominal value.
The sign of the error is positive if the bar amplitude is greater than the nominal value.
12.2 Measurement procedure
a) Select test signal I for 625-line systems or test signal V for 525-line systems.
b) Measure the difference in level between points b 1 and and record this value U,,2 in mV.
b2,
c) Calculate the error from the expression:
100 U'' U U° (°lo) (12.2a)
„
where U is the nominal value of the luminance bar amplitude given in Table I.
n
Note. - For television systems with negative modulation the nominal amplitude of the residual carrier should correspond to
nominal white reference level.
The residual carrier error, expressed as a percentage of the nominal peak amplitude of the vision carrier, may be
calculated by multiplying the luminance bar amplitude error according to Item c) above with a constant equal to
Un
(12.2b)
Uo + Uso
where Uo and Uso are the values given in Table I or calculated from the formulae 10.3a and 10.3b.
13. Synchronizing pulse amplitude error
13.1 Introduction
The synchronizing pulse amplitude error is the difference between the actual amplitude of the
synchronizing pulse and its nominal value, expressed as a percentage of the nominal value.
The sign of the error is positive if the synchronizing pulses are larger than the nominal value.

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13.2 Measurement procedure
a) Select test signal I for 625-line systems or test signal V for 525-line systems.
b)
Measure the difference in level between points b 8 and b9, and record this value U8 , 9 in mV.
c) If a manual method of measurement is used, calculate the error from the formula:
us, U Uso
So = 100
(%) (13.2a)
so
where Uso
is the nominal value of the synchronizing pulse amplitude at the output of the demo-
dulator given in Table I or calculated from the formula 10.3b.
d) In the case of an automatic method of measurement, the analyzer will give the error as a
percentage of the nominal value (Us)
of the synchronizing pulse amplitude at the input of the
transmitter, according to the formula:
US
S = 100 U8' (%) (13.2b)
U S
In those cases where Uso is not equal to Us, correct this value with the aid of the formula:

So Ûsô (S + 100) — 100 (%)
(13.2c)
14. Luminance bar tilt
14.1 Introduction
The luminance bar tilt is the difference between the level of the luminance bar (section
B2) at
point b3
of the demodulated test signals I or V, 1 after the half-amplitude point of its leading
edge, and the level at point b4, 1 µs before the nominal half-amplitude point of its trailing edge,
expressed as a percentage of the luminance bar amplitude.
Note. - The value of 1 µs is in accordance with CCIR Recommendation [3] mentioned in Appendix C. However, when
excessive ringing is present a value of 1.5 µs would be preferable in order to improve the accuracy of the measure-
ment.
The sign of the bar tilt is positive if the level of the luminance bar at point ba is higher than the
level at point b3.
Except for System I, the measurements are made with the bandwidth of the demodulated video
signal limited by the network described in Clause 5 of Appendix B,
or by an equivalent filter.
14.2 Measurement procedure
a) Select test signal I
for 625-line systems or test signal V for 525-line systems.
b) Measure the difference in level,
U3 , between points b 3 and ba.
a,
c)
Calculate the bar tilt from the expression:
U3 ,a
100 (%) (14.2)
L%1, 2

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15. Base-line distortion
15.1 Introduction
Base-line distortion is expressed as the difference between the level at point b7 of the demodulated
test signals I or V, 1 ps after the half-amplitude point of the trailing edge of the luminance bar
(section B 2), and the level at reference point b 1, expressed as a percentage of the luminance
bar amplitude.
The sign of the base-line distortion is positive if the level at point b7 is higher than the level at
point b,.
The measurements are made with the bandwidth of the demodulated video signal limited by
the network described in Clause 5 of Appendix B, or by an equivalent filter, as for example for
System I.
15.2 Measurement procedure
a) Select test signal I for 625-line systems or test signal V for 525-line systems.
b) Measure the difference in level, U 1,7 , between points b, and b7.
c) Calculate the distortion from the expression:
100 U''' (%) (15.2)
U1,2
16. 2T pulse/bar ratio error
16.1 Introduction
The 2T sine-squared pulse/bar ratio error is the difference between the amplitudes of the 2T
pulse (section B 1) and the luminance bar (section B 2) of the demodulated test signals I or V,
expressed as a percentage of the luminance bar amplitude. The amplitude of the 2T pulse is the
difference between the level at point b11 and the level at reference point b7.
The sign of the error is positive if the amplitude of the 2T pulse is greater than the luminance bar
amplitude.
Some measuring equipment may indicate the 2T pulse/bar ratio itself, rather than the error.
16.2 Measurement procedure
Select test signal I for 625-line systems or test signal V for 525-line systems.
a)
b) Measure the amplitude of the 2 T pulse, U7,11 , between points b„ and b7.
c) Calculate the error from the expression:
11 - U1, 2
U7,
1 00 (%) (16.2)
U1, 2

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SIST EN 60244-10:1999
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17. 2T pulse shape distortion
17.1 Introduction
2T pulse shape distortion relates to the departure of the 2T pulse from its ideal shape. The per-
K,
formance with respect to this type of distortion is normally given in terms of a rating factor, for
which numerical limits are assigned in the equipment specification. It is measured by means of an
appropriate graticule for the relevant television standard and equipment specification.
17.2 Measurement procedure for a manual method of measurement
a) Select test signal I for 625-line systems or test signal V for 525-line systems on the oscillo-
scope.
b) Employ the oscilloscope graticule shown in Figure 10, page 43, and adjust the oscilloscope so
that:
- the sweep velocity corresponds to the time scale of the graticule;
- blanking level coincides with the horizontal axis through level reference point "0%" of the
graticule;
- the peak of the 2T pulse falls on the horizontal line through level reference point "100%";
- the half-amplitude points of the 2T pulse are symmetrically disposed about the vertical axis
through time reference point "0".
State whether the waveform is within the specified K-rating tolerance, or state the measured
c)
K-rating factor.
17.3 Measurement 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. Amplitude/video-frequency characteristic
18.1 Introduction
The amplitude/video 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 in section C 1 when test signal II is used, or half the peak-to-peak amplitude when
test sign
al VI is used.
Alternatively, the luminance bar in section B2 of test signals I or V may be taken as the reference
luminance signal.
18.2 Measurement procedure
a) Select test signal II for 625-line systems or test signal VI for 525-line systems.
b) Measure the peak-to-peak amplitude Uc i between the mid-duration points of the reference
luminance signal in section C1.
c) Measure the peak-to-peak amplitude at the mid-duration point of each sine-wave signal
Uc2
in section
C2, for each frequency up to the highest in accordance with the television standard
concerned.

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d) For each frequency of the sine-wave signal, calculate the ratio
for 625-line systems:
20 log (dB) or 20 log (18.2a)
U1,z (dB)
U1c^ 0.6
for 525-line systems:
z
20 log U (dB) or 20 log U (dB) (18.2b)
c l
zz
e) Tabulate the ratios as a function of video frequency.
19. Chrominance-luminance gain inequality
19.1 Introduction
Chrominance
-luminance gain inequality is the difference between the peak-to-peak amplitude
of the chrominance signal in section 1 or Gy (or in section
G G) of the demodulated test signal IV
(or VI) and the amplitude of a reference luminance signal, expressed as a percentage of this ampli-
tude.
The amplitude of the reference luminance signal is equal to the amplitude of the luminance bar in
section B2 of test signal I when test signal IV is used, and is equal to 0.8 times the amplitude of the
luminance bar in section B2 of test signal V when test signal VI is used.
The sign of the gain inequality is positive if the amplitude of the chrominance signal is greater
than that of the luminance bar.
19.2 Measurement procedure
a) Select test signal IV for 625-line systems or test signal VI for 525-line systems.
b) Measure the peak-to-peak amplitude of the chrominance signal in section G 1 or G2 for
U5
625-line systems, or in section G for 525-lines systems, at the time defined by point b5.
c) Measure the amplitude of the luminance bar, U1 ,
z, as previously described.
d) Calculate the gain inequality from the expressions
Us – U1,z
for 625-line systems: 100 (010) (19.2a)
.f Y
z
Us — 0.8 U1, z
for 525-line systems: 100 (To) (19.2b)
0.8
U1,z
Alternatively, the chrominance/luminance
gain inequality may be determined by using the
manual method of measurement described in Sub-
...