SIST EN 60244-12-1:1999
(Main)Methods of measurement for radio transmitters -- Part 12: Guideline for drawing up descriptive leaflets for transmitters and transposers for sound and television broadcasting -- Characteristics to be specified
Methods of measurement for radio transmitters -- Part 12: Guideline for drawing up descriptive leaflets for transmitters and transposers for sound and television broadcasting -- Characteristics to be specified
Applies to manufacturers' descriptive leaflets providing information on transmitters and transposers for sound and television broadcasting. Lays down uniform methods of expressing the performance characteristics of transmitters and transposers for sound and television broadcasting. Lists the essential characteristics and technical information needed for the appraisal and comparison of equipment. Provides, where appropriate, cross-references to standardized methods of measurement for the performance characteristics listed.
Meßverfahren für Funksender -- Teil 12: Anleitung zur Erstellung von Datenblättern für Funksender und Umsetzer für Fernseh- und Tonrundfunk -- Anzugebende Kennwerte
Méthodes de mesure applicables aux émetteurs radioélectriques -- Partie 12: Guide de rédaction des feuilles de spécification des émetteurs et des réemetteurs de télévision et de radiodiffusion sonore -- Caractéristiques à spécifier
S'applique aux feuilles de spécification rédigées par les fabricants, donnant des informations sur les émetteurs et les réémetteurs de télévision et de radiodiffusion sonore. Etablit des modes uniformes d'indication des caractéristiques fonctionnelles des émetteurs et des réémetteurs de télévision et de radiodiffusion sonore. Donne la liste des informations techniques et des caractéristiques essentielles nécessaires à l'évaluation et à la comparaison des matériels. Indique, lorsque cela convient, les références des méthodes de mesure normalisées qui correspondent aux caractéristiques énumérées.
Methods of measurement for radio transmitters - Part 12: Guideline for drawing up descriptive leaflets for transmitters and transposers for sound and television broadcasting - Characteristic to be specified (IEC 60244-12-1:1989)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 60244-12-1:1999
01-januar-1999
Methods of measurement for radio transmitters - Part 12: Guideline for drawing up
descriptive leaflets for transmitters and transposers for sound and television
broadcasting - Characteristic to be specified (IEC 60244-12-1:1989)
Methods of measurement for radio transmitters -- Part 12: Guideline for drawing up
descriptive leaflets for transmitters and transposers for sound and television
broadcasting -- Characteristics to be specified
Meßverfahren für Funksender -- Teil 12: Anleitung zur Erstellung von Datenblättern für
Funksender und Umsetzer für Fernseh- und Tonrundfunk -- Anzugebende Kennwerte
Méthodes de mesure applicables aux émetteurs radioélectriques -- Partie 12: Guide de
rédaction des feuilles de spécification des émetteurs et des réemetteurs de télévision et
de radiodiffusion sonore -- Caractéristiques à spécifier
Ta slovenski standard je istoveten z: EN 60244-12-1:1993
ICS:
33.060.20 Sprejemna in oddajna Receiving and transmitting
oprema equipment
SIST EN 60244-12-1:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 60244-12-1:1999
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SIST EN 60244-12-1:1999
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SIST EN 60244-12-1:1999
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SIST EN 60244-12-1:1999
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SIST EN 60244-12-1:1999
NORME CEI
INTERNATIONALE IEC
INTERNATIONAL 60244-12-1
Première édition
STAN DARD
First edition
1989-08
Méthodes de mesure applicables aux
émetteurs radioélectriques
Douzième partie:
Guide de rédaction des feuilles de spécification
des émetteurs et des réémetteurs de télévision
et de radiodiffusion sonore —
Caractéristiques à spécifier
Methods of measurement for radio transmitters
Part 12:
Guideline for drawing up descriptive leaflets
for transmitters and transposers for sound
and television broadcasting —
Characteristics to be specified
© IEC 1989 Droits de reproduction
réservés — 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: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http: //www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
S
PRICE CODE
International Electrotechnical Commission
IEC
MemiayHaponHaR 3neKTpoTexHH4ecnan HOMHCCHA
Pour prix, voir catalogue en vigueur
•
• For price, see current catalogue
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SIST EN 60244-12-1:1999
244-12-1©IEC — 3 —
CONTENTS
Page
FOREWORD 5
PREFACE 5
7
INTRODUCTION
Clause
7
1 . Scope
7
2. Object
7
3. General notes on the format of the leaflet
SECTION ONE — GENERAL CHARACTERISTICS APPLICABLE
TO ALL CATEGORIES OF TRANSMITTERS AND TRANSPOSERS
9
4. Introduction
9
5. Characteristics
SECTION Two — PERFORMANCE CHARACTERISTICS FOR
TELEVISION TRANSMITTERS
6. Introduction 19
Characteristics of the vision section 19
7.
8. Characteristics of the sound section 25
SECTION THREE — PERFORMANCE CHARACTERISTICS FOR
TELEVISION TRANSPOSERS
9. Introduction 27
27
10. Characteristics of the vision channel
11. Characteristics of the sound channel 33
SECTION FOUR — PERFORMANCE CHARACTERISTICS FOR TRANSMITTERS
FOR FM SOUND BROADCASTING
12. Introduction 33
13. Characteristics 33
SECTION FIVE — PERFORMANCE CHARACTERISTICS FOR
AMPLITUDE—MODULATED SOUND TRANSMITTERS
14. Introduction 37
15. Characteristics 37
SECTION SIX — PERFORMANCE CHARACTERISTICS FOR
TRANSPOSERS FOR FM SOUND BROADCASTING
16. Introduction 41
17. Characteristics 41
SECTION SEVEN — PERFORMANCE CHARACTERISTICS FOR
VESTIGIAL—SIDEBAND DEMODULATORS
(Under consideration)
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244-12-1 ©IEC — 5 —
INTERNATIONAL ELECTROTECHNICAL COMMISSION
METHODS OF MEASUREMENT
FOR RADIO TRANSMITTERS
Part 12: Guideline for drawing up descriptive leaflets for transmitters
and transposers for sound and television broadcasting —
Characteristics to be specified
FOREWORD
1)
The formal decisions or agreements of the I EC 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 I EC expresses the wish that all National Committees should adopt the text of
the I EC recommendation for their national rules insofar as national conditions will permit. Any divergence between the I EC
recommendation and the corresponding national rules should, as far as possible, be clearly indicated in the latter.
4)
The I EC has not laid down any procedure concerning marking as an indication of approval and has no responsibility when an
item of equipment is declared to comply with one of its recommendations.
PREFACE
This standard has been prepared by Sub-Committee 12C: Transmitting equipment, of I EC Technical Committee No. 12:
Radiocom m un ications.
The text of this standard is based on the following documents:
Six Months' Rule Reports on Voting
Two Months' Procedure Reports on Voting
12C(CO)185
12C(CO)194 12C(CO)196
12C(CO)202
12C(CO)188 12C(CO)198
12C(CO)204 12C(CO)208
12C(CO)189
12C(CO)199
12C(CO)190
12C(CO)200
12C(CO)191 12C(CO)201
12C(CO)205
12C(CO)210
Further information can be found in the Repo rts on Voting indicated in the table above.
The following I EC publications are quoted in this standard:
Publications Nos.
215 (1987): Safety requirements for radio transmitting equipment.
244:
Methods of measurement for radio transmitters.
244-1 (1968): Part
l: General conditions of measurement, frequency, output power and power
consumption.
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.
244-11 (1989):
Part 11: Transposers for FM sound broadcasting.
244-12-2 (1989): Guideline for drawing up desc
riptive leaflets or transmitters and transposers for sound and
television broadcasting — Specification sheets (being printed).
864-1 (1986):
Standardization of interconnections between broadcasting transmitters or transmitter
systems and supervisory equipment, Pa rt
1: Interface standards for systems using
dedicated interconnections.
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SIST EN 60244-12-1:1999
IEC
244-12-1 © — 7
METHODS OF MEASUREMENT
FOR RADIO TRANSMITTERS
Part 12: Guideline for drawing up descriptive leaflets for transmitters
and transposers for sound and television broadcasting —
Characteristics to be specified
INTRODUCTION
As an interim measure and in order to ease the updating of references made to publications dealing
with methods of measurement with clauses of this standard, tables initially belonging to sections of
the different documents composing this standard are published in IEC Publication 244-12-2:
Specification sheets.
This standard is one of a series of parts of IEC Publication 244,
describing recommended methods of
measurement for assessing the performance of radio transmitters and shall be used in conjunction with
IEC Publication 244-12-2
regularly updated while dedicated pa rts of I EC Publication 244
are currently
being revised.
1. Scope
This standard applies to the manufacturer's desc
riptive leaflets providing information on
transmitters and transposers for sound and television broadcasting.
2. Object
The standard is intended:
— to lay down uniform methods of expressing
the
performance characteristics of transmitters and
transposers for sound and television broadcasting;
— to list the essential characteristics and technical information needed for the appraisal and
comparison of equipment;
—
to provide, where appropriate, cross references to standardized methods of measurement for the
performance characteristics listed.
Leaflets prepared in accordance with this standard need not form but may form part of
instruction manuals supplied with the equipment.
3. General notes on the format of the leaflet
Two categories of characteristics are specified as follows:
— general characteristics applicable to all categories of transmitters and transposers;
—
performance characteristics specific to a particular type of equipment, e.g. a television trans-
mitter or a transposer for frequency-modulated sound broadcasting.
The general characteristics cover electrical and other characteristics which can have an effect on
the performance of the equipment; they shall include the following technical information:
a) functional descri
ption of the various items of equipment including block diagrams, where
appropriate;
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244-12-1
layout of the equipment and constructional details, including dimensions and weights, of the
b)
individual items and ancillary equipment required for normal operation;
figures about cooling and means and quality of coolant;
c)
characteristics affecting the environment, e.g. heat dissipation in the transmitter room and
d)
acoustic noise;
type designation of the equipment and individual items, where applicable;
e)
number and type designation of thermionic tubes used in power stages.
J
Some characteristics and/or technical information may not be appropriate to all types of
equipment, e.g. low power transmitters.
Additional characteristics, other than those mentioned in this standard, may be included in a
particular leaflet.
As far as practicable, the definitions given in this standard are in accordance with those of the
s of I EC Publication 244. It should be noted, however, that the definitions are intended
various part
for the guidance of authors and should not in general appear in the actual leaflets.
SECTION ONE — GENERAL CHARACTERISTICS APPLICABLE
TO ALL CATEGORIES OF TRANSMITTERS AND TRANSPOSERS
4. Introduction
The general characteristics described in this section are listed in Table I of I EC Publica-
tion 244-12-2.
Where appropriate, reference is made in Table I to the standardized methods of measurement
and test signals described in other I EC publications.
5. Characteristics
5.1 Transmission system
The transmission system(s) the transmitter or transposer is capable of handling shall be stated
and be designated in accordance with the latest issue of the relevant CCIR Recommendation or
Report, e.g.:
— 624;
for television: CCIR Repo rt
— for FM sound broadcasting: CCIR Recommendation 450;
— for AM sound broadcasting: CCIR Repo rt 458.
5.2 Frequency range
The frequency range refers to the frequency band (or bands) in which the transmitter or
transposer is capable of operating.
The following details shall be specified:
— the lower and upper limits of the frequency band (or bands), expressed in kHz or MHz;
— information on any frequency dependent components or sub-assemblies in the equipment that
shall be replaced or modified to cover the above specified frequency range;
rive may be used
— the way in which the carrier frequency is generated and whether an external d
instead;
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244-12-1 ©IEC — 11 —
for transposers, the frequency range for reception and for transmission, together with any input
—
and output frequency combinations which shall be avoided;
— if applicable, the switching time (min. and max.) for a frequency change for transmitters which
rt wave
operate in different bands or in different frequencies within a band (see sho
transmitters).
Carrier frequency stability
5.3
er frequency stability shall be specified as the difference, expressed in Hz between the
The carri
highest and the lowest value of carrier frequency during the following periods of time:
1 h for short-term stability, and
—
— six months for long-term stability.
riers shall be given. For a
For a television transmitter, the stability of both sound and vision car
transposer, the frequency transposition stability shall be given.
5.4 Intermediate frequencies
If the modulation or conversion process is carried out at intermediate frequencies, the inter-
mediate frequency or frequencies shall be stated.
5.5 Rated output power (rated output power range)
ge) is the power (or the range of the power) that
The rated output power (or rated output power r an
the transmitter or transposer shall deliver at its output under specified conditions of operation.
The rated output power, expressed in W or kW, shall be stated as follows:
— for television transmitters and transposers: the peak envelope power of the vision signal;
er;
— for FM sound transmitters and transposers: the power of the unmodulated car ri
rier;
— for double-sideband AM sound transmitters: the power of the unmodulated car
— for single-sideband AM sound transmitters: the peak envelope power.
In this last case, the degree of carrier reduction, expressed in dB relative to peak envelope power,
shall also be specified.
5.6 Nominal load impedance
The nominal load impedance, i.e. the nominal value of the radio-frequency impedance into
which the transmitter or transposer shall deliver its rated output power, shall be specified.
5.7 Load impedance mismatch
The voltage standing wave ratio presented by the radio-frequency load impedance mismatch
concerns both:
the maximum V.S.W.R. up to which the transmitter or transposer is capable of operating within
a)
the performance specifications;
b) the maximum V.S.W.R. for which the transmitter or transposer is capable of operating without
damage or without the intervention of a protective device.
Both values shall be specified.
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Nominal input impedance
5.8
The nominal input impedance, i.e. the nominal value of the impedance presented at the input
connector (or connectors) of the transmitter or transposer, shall be specified in ohms, balanced or
unbalanced.
If a high-impedance audio-frequency input is used, the reactive pa rt of the impedance shall also
be given.
Nominal input impedance mismatch
5.9
The nominal input impedance mismatch relates to the mismatch measured at the input connec-
tor (or connectors) for any frequency within the audio-frequency or video-frequency bandwidth, or
the radio-frequency channel bandwidth. It is expressed in terms of the ratio of the incident wave to
the reflected wave.
The minimum value of this ratio shall be stated in decibels.
5.10 Nominal input voltage
The nominal input voltage together with the input impedance on which this normal input voltage
appears (see note), i.e. the nominal value of the voltage at the input connector (or connectors), shall
be specified as follows:
— for audio-frequency signals: the r.m.s. value of a sinusoidal si gnal at a specified frequency, in
mV or dB (mV), for maximum modulation (or rated deviation);
— for video-frequency signals: the peak-to-peak voltage of the si gnal between synchronizing level
and white reference level in V (usually IV);
— for the radio-frequency signals at the input of a transposer: the r.m.s., in mV or dB (mV), of
a sinusoidal signal at a specified vision carrier frequency, with an amplitude corresponding to
the peak envelope voltage of the vision si gnal.
Note. — Refer to values defined in Sub-clause 5.8.
5.11 Input voltage range
The input voltage range is the range of voltages at the input connector (or connectors) within
which the transmitter or transposer can be adjusted to meet the performance specifications.
The upper and lower limits of the input voltage range shall be specified in dB above and below the
nominal input voltage as defined in Sub-clause 5.10.
5.12 Spurious emissions
Spurious emission of any spurious components (such as harmonics, intermodulation products
resulting from the presence of other transmissions and other unwanted components) at frequencies
which are outside the necessary bandwidth and the level of which may be reduced without affecting
the wanted transmission.
The maximum value of power of the spurious components at the transmitter or transposer output
shall be specified and, preferably, be expressed in dB below rated output power.
5.13
Out-of-band emissions
See the relevant sections of this standard.
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5.14 Cabinet radiation
Cabinet radiation concerns any harmful or interfering radiation from the transmitter or
transposer at any frequency originating from sources other than the radio-frequency load.
a) Harmful radiation
Under consideration.
b) Interfering radiation
Under consideration.
5.15 Environmental conditions
a) Ambient temperature
The lower and upper limits of the two temperature ranges within which the transmitter or
transposer, together with such ancillary equipment as is necessary to maintain the transmitter in
normal operation (see Note), is capable of:
operating within the performance specifications, and
1)
2) continuing to function, shall be specified in degrees Celsius.
Where appropriate, additional temperature ranges shall be given for ancillaries located outside
the building.
Note. — Ancillary equipment includes heat exchangers, cooling systems, etc.
b) Relative humidity
The maximum value of relative humidity at which the transmitter or transposer is capable of
operating within the performance specifications, or may remain switched off for indefinite
periods without danger or damage to its component pa rts, shall be stated.
c) Air cooling inlet temperature and relative humidity of the air ,
In the case of air-cooled transmitters or transposers, the temperature limits and the relative
b) above, and
humidity in the inlet air shall be specified for the conditions given in Items a) and
be expressed in the form as given in those items.
d) Altitude
The maximum altitude at which the transmitter or transposer is capable of operating within the
performance specifications shall be stated and be given in metres above sea level.
5.16 Type of primary power supply
The following details shall be given regarding the type of primary power supply:
a)
whether the transmitter or transposer is to operate on d.c. or a.c.;
b) for d.c., which pole of the power supply is earthed;
c) for a.c., whether the supply mains is single-phase or three-phase;
d)
for a three-phase supply, whether a three-wire or a four-wire system is required and, in the latter
case, also whether the neutral is earthed or not in the transmitter or transposer.
5.17
Voltage and frequency of the primary power supply
The following characteristics of the a.c. or d.c. power supply and the tolerances within which
the transmitter or transposer is capable of meeting the performance specifications, shall be
specified:
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a) the nominal value of the voltage, together with the maximum positive and negative tolerances
on this value, expressed as percentages;
If the output power deviates from its rated value when the voltage differs from its nominal value,
this shall be stated and be expressed in dB for both the upper and lower voltage limits;
b) for an a.c. supply, if applicable, the largest deviation from the instantaneous value of the
fundamental wave for any pa
rt of the curve shall be expressed in percentage as I EC Publica-
tion 244-1 recommends;
c)
for a three-phase supply, the voltage unbalance, i.e. the maximum r.m.s. value of both the
negative-sequence component and zero-sequence component, expressed as a percentage of the
r.m.s. value of the positive-sequence component;
d)
the nominal value of the frequency of the supply system and the maximum positive and negative
tolerances, expressed in Hz;
e) for a d.c. supply, the maximum peak-to-peak a.c. component, expressed as a percentage of the
nominal d.c. voltage.
5.18 Power consumption
The power consumption (or input active power) of the transmitter or transposer for normal
operation, including the power absorbed by the ancillary equipment, shall be specified in W or kW
and be given for different conditions of modulation and for different car rier frequencies within the
frequency range of the transmitter, the equipment being adjusted to deliver its rated output
power.
5.19 Power factor
The power factor, i.e. the ratio of the input active power to the input apparent power, shall be
stated as a decimal part of unity and be given for the modulating conditions mentioned in Sub-
clause 5.18.
5.20
Additional information relating to the supply mains
If applicable, the following additional information shall be given:
a)
interference voltages on the supply mains caused by the transmitter or transposer;
b) immunity to transients on the supply mains.
5.21 Safety standards
If the equipment complies with I EC Publication 215, it will be sufficient to state this. If it does
not, the measures taken in the transmitter, transposer and the ancillary equipment to protect
personnel from hazards shall be clearly stated.
5.22 Protection against atmospheric discharges
Under consideration.
5.23
Interface facilities for supervisory equipment
A list of commands and indications for supervisory equipment shall be given together with the
interface techniques used, with reference to I EC Publication 864-1.
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Connectors characteristics
5.24
The type, sex and characteristic impedance of the signal input(s) and r.f. output(s) of the
transmitter shall be listed.
SECTION TWO — PERFORMANCE CHARACTERISTICS FOR
TELEVISION TRANSMITTERS
Introduction
6.
In addition to the general characteristics described in Section One, the performance characteris-
tics given in this section shall be included in leaflets relating to television transmitters.
The characteristics mentioned below are listed in Table II of I EC Publication 244-12-2, where
reference is made to the standardized methods of measurement and test signals described in other
I E C publications.
7. Characteristics of the vision section
7.1
Amplitude/radio-frequency characteristic
The amplitude/radio-frequency characteristic is the relationship between the amplitude and the
frequency of both sideband components which are produced when the transmitter is modulated
with a sinusoidal signal of constant amplitude and va riable frequency, superimposed on a
luminance signal of a constant level.
Note. — The amplitude/radio-frequency characteristic is sometimes referred to as "sideband characteristic" or "sideband
response".
The maximum variation in amplitude, expressed in dB relative to the amplitude at a certain
reference frequency, shall be specified in the form of a table or graph, together with the reference
er.
frequency, expressed in MHz relative to the frequency of the vision car ri
7.2
Amplitude/video-frequency characteristic
The amplitude/video-frequency characteristic is the relationship between the peak-to-peak
amplitude and frequency of the demodulated vision signal, which is produced when the transmitter
is modulated with a sinusoidal signal of constant amplitude and va riable frequency, superimposed
on a luminance signal of a constant level.
Note. — The amplitude/video-frequency characteristic is sometimes referred to as "overall video-frequency characteristic"
or "overall video-frequency response".
The maximum variation in amplitude, expressed in dB relative to the amplitude at a certain
reference frequency, shall be specified in the form of a table or graph, together with the reference
video frequency used.
7.3 Group-delay/video-frequency characteristic
The group-delay/video-frequency characteristic is the relationship between the va riation of
group-delay and frequency of the demodulated vision signal, which is produced when the
transmitter is modulated with a sinusoidal signal of constant amplitude and va riable frequency,
superimposed on a luminance signal of a constant level.
The maximum va
riation in group-delay, expressed in nanoseconds relative to the group-delay at
a certain reference frequency, shall be specified in the form of a table or graph without the receiver
pre-correction being in operation. The reference video frequency shall be stated.
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244-12-1 ©
Luminance bar tilt
7.4
The luminance bar tilt is the difference between the amplitudes of the luminance bar 1 µs after the
half-amplitude point of its leading edge and 1 µs before the half-amplitude point of its trailing
edge.
The maximum value of bar tilt, expressed in percentage of the luminance bar amplitude or in
terms of the rating factor K for the line-time bar response, shall be stated together with the test
signal used.
2T pulse/bar ratio or ratio error
7.5
The 2T pulse/bar ratio is the ratio between the amplitude of the 2T pulse and the luminance bar.
The 2T pulse/bar ratio error is the difference between this ratio and unity.
Either of the two expressions shall be given in percentage or in terms of the rating factor K for
maximum error.
2T pulse shape distortion
7.6
The 2T pulse shape distortion relates to the departure of the 2T pulse from its ideal shape.
The limit shall be specified as a rating factor K in accordance with the television standard
concerned and may be measured on an oscilloscope fitted with an appropriate graticule.
7.7 Field-time bar tilt
The field-time bar tilt is the difference between the amplitude of the field-time bar 250 µs
after the half-amplitude point of its leading edge and 250 µs before the half-amplitude point of its
trailing edge.
The maximum value of bar tilt shall be specified and be expressed in percentage of the field-time
bar amplitude or in terms of the rating factor K for the field-time bar response.
7.8 Variation of output power
Vari
ation of output power is the change of the peak envelope power of the vision signal due to a
variation in picture content.
The maximum variation of output power shall be specified in dB for a constant value of the
mains voltage.
7.9 Variation of blanking level
Variation of blanking level is the change of blanking level due to:
a) a variation in picture content;
b) a variation of the blanking level of the video input signal;
c) hum or noise superimposed on the video input signal.
The maximum variation of blanking level shall be specified in percentage of the peak envelope
amplitude of the vision signal for a constant value of the mains voltage.
The vari and the peak-to-peak voltage of the super-
ation of blanking level mentioned in Item b)
imposed hum or noise mentioned in Item
c) shall be stated as well.
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Luminance non-linearity
7.10
The luminance non-linearity or amplitude distortion of the luminance signal relates to the change
in amplitude of the luminance signal as a function of luminance amplitude.
The luminance non-linearity shall be specified as the minimum value of the ratio between the
smallest and largest riser of a five-riser staircase waveform extending from blanking level to white
reference level. Alternatively, the difference between this ratio and unity may be specified. Either of
the two expressions shall be given in percentage.
7.11 Differential gain
Differential gain relates to the change in amplitude of the chrominance sub-carrier due to a
riation in amplitude of the associated luminance signal.
va
The maximum and the minimum value of the chrominance sub-carrier amplitude relative to the
amplitude at blanking level shall be specified in percentage. From these two values all other
expressions mentioned in I EC Publication 244-5 can be easily derived.
The level of the sub-carrier at blanking level and the levels within which the amplitude of the
luminance signal is varied shall also be stated.
7.12 Differential phase
Differential phase is the maximum change in phase of the
chrominance sub-carrier signal relative
to the phase of this signal at blanking level, due to a va riation in amplitude of the associated
luminance signal.
The maximum absolute value of the differential phase shall be specified in degrees, together with
the amplitude of the chrominance sub-carrier at the blanking level and the levels within which the
amplitude of the luminance signal is varied.
7.13 Chrominance-luminance crosstalk
Chrominance-luminance crosstalk relates to the change in amplitude of the luminance signal as a
function of the amplitude of the associated chrominance signal.
The chrominance-luminance crosstalk shall be specified as the maximum change in amplitude of
the luminance signal, expressed in percentage of the amplitude from blankin
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