SIST EN 55020:2007

SLOVENSKI STANDARD
01-september-2007
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SIST EN 55020:2003
SIST EN 55020:2003/A1:2004
SIST EN 55020:2003/A2:2005
SIST EN 55020:2003/IS2:2007
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Sound and television broadcast receivers and associated equipment - Immunity
characteristics - Limits and methods of measurement
Ton- und Fernseh-Rundfunkempfänger und verwandte Geräte der
Unterhaltungselektronik - Störfestigkeitseigenschaften - Grenzwerte und Prüfverfahren
Récepteurs de radiodiffusion et de télévision et équipements associés - Caractéristiques
d'immunité - Limites et méthodes de mesure
Ta slovenski standard je istoveten z: EN 55020:2007
ICS:
33.100.20 Imunost Immunity
33.160.01 Avdio, video in avdiovizualni Audio, video and audiovisual
sistemi na splošno systems in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 55020
NORME EUROPÉENNE
January 2007
EUROPÄISCHE NORM
ICS 33.100.20 Supersedes EN 55020:2002 + A1:2003 + A2:2005
+ IS1:2007 + IS2:2007
English version
Sound and television broadcast receivers
and associated equipment -
Immunity characteristics -
Limits and methods of measurement
(CISPR 20:2006)
Récepteurs de radiodiffusion et de Ton- und Fernseh-Rundfunkempfänger
télévision et équipements associés - und verwandte Geräte der
Caractéristiques d'immunité - Unterhaltungselektronik -
Limites et méthodes de mesure Störfestigkeitseigenschaften -
(CISPR 20:2006) Grenzwerte und Prüfverfahren
(CISPR 20:2006)
This European Standard was approved by CENELEC on 2006-12-01. 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, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the 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

© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 55020:2007 E
- 2 - EN 55020:2007
Foreword
The text of document CISPR/I/200/FDIS, future edition 6 of CISPR 20, prepared by CISPR SC I,
Electromagnetic compatibility of information technology equipment, multimedia equipment and receivers,
was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 55020 on
2006-12-01.
This European Standard supersedes EN 55020:2002 (+ corrigendum September 2005) + A1:2003
(+ corrigendum September 2005) + A2:2005 + IS1:2007 + IS2:2007.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2007-09-01
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2009-12-01
with the EN have to be withdrawn
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and covers essential requirements of
EC Directives 89/336/EEC, 2004/108/EC and 1999/5/EC. See Annex ZZ.
Annexes ZA and ZZ have been added by CENELEC.
__________
Endorsement notice
The text of the International Standard CISPR 20:2006 approved by CENELEC as a European Standard
without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
CISPR 22 NOTE  Harmonized as EN 55022:2006 (modified).
CISPR 24 NOTE  Harmonized as EN 55024:1998 (modified).
__________
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

1) 2)
CISPR 16-1-3 - Specification for radio disturbance and EN 55016-1-3 2006
immunity measuring apparatus and methods
Part 1-3: Radio disturbance and immunity
measuring apparatus - Ancillary equipment -
Disturbance power
1)
IEC 60050-161 - International Electrotechnical Vocabulary - -
(IEV)
Chapter 161: Electromagnetic compatibility

3)
IEC 60268-1 1985 Sound system equipment HD 483.1 S2 1989
Part 1: General
1) 2)
IEC 61000-4-2 - Electromagnetic compatibility (EMC) EN 61000-4-2 1995
Part 4-2: Testing and measurement
techniques - Electrostatic discharge immunity
test
1) 2)
IEC 61000-4-3 - Electromagnetic compatibility (EMC) EN 61000-4-3 2006
Part 4-3 : Testing and measurement
techniques - Radiated, radio-frequency,
electromagnetic field immunity test

1) 2)
IEC 61000-4-4 - Electromagnetic compatibility (EMC) EN 61000-4-4 2004
Part 4-4: Testing and measurement
techniques - Electrical fast transient/burst
immunity test
IEC 61672-1 2002 Electroacoustics - Sound level meters EN 61672-1 2003
Part 1: Specifications
ETS 300 158 1992 Satellite Earth Stations and Systems (SES) - - -
Television Receive Only (TVRO-FSS)
Satellite Earth Stations operating in the 11/12
GHz FSS bands
ETS 300 249 1993 Satellite Earth Stations and Systems (SES) - - -
Television Receive-Only (TVRO) equipment
used in the Broadcasting Satellite Service
(BSS)
1)
Undated reference.
2)
Valid edition at date of issue.
3)
HD 483.1 S2 includes A1 to IEC 60268-1.

- 4 - EN 55020:2007
Publication Year Title EN/HD Year
1)
ITU-R - Measurement of audio-frequency noise - -
Recommendation voltage level in sound broadcasting
BS 468-4
ITU-R 1986 Nomenclature and description of colour bar - -
Recommendation signals
BT.471-1
1)
ITU-R - Methodology for the subjective assessment of - -
Recommendation the quality of television pictures
BT.500-10
1)
ITU-T - Transmission performance of television - -
Recommendation circuits designed for use in international
J.61 connections
Annex ZZ
(informative)
Coverage of Essential Requirements of EC Directives
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and within its scope the standard covers the
essential requirements as given in Article 4(b) of the EC Directive 89/336/EEC and Annex I Article 1(b) of
the EC Directive 2004/108/EC, and the essential requirements of Article 3.1(b) (immunity only) of the EC
Directive 1999/5/EC.
Compliance with this standard provides one means of conformity with the specified essential
requirements of the Directives concerned.
WARNING: Other requirements and other EC Directives may be applicable to the products falling within
the scope of this standard.
__________
COMMISSION
CISPR
ÉLECTROTECHNIQUE
INTERNATIONALE
INTERNATIONAL
Sixième édition
ELECTROTECHNICAL
Sixth edition
2006-11
COMMISSION
COMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
Récepteurs de radiodiffusion et
de télévision et équipements associés –
Caractéristiques d’immunité –
Limites et méthodes de mesure
Sound and television broadcast
receivers and associated equipment –
Immunity characteristics –
Limits and methods of measurement
© IEC 2006 Droits de reproduction réservés ⎯ Copyright - all rights reserved
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électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
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Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
CODE PRIX
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МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue

CISPR 20 © IEC:2006 – 3 –
CONTENTS
FOREWORD.11

1 Scope and object.15
2 Normative references .17
3 Terms, definitions and abbreviations .17
3.1 Terms and definitions .17
3.2 Abbreviations .23
4 Immunity requirements .23
4.1 Performance criteria .23
4.2 Applicability.27
4.3 Immunity requirements for the antenna input connector.27
4.4 Immunity requirements for audio connectors .43
4.5 Immunity requirements for AC mains power connectors.45
4.6 Requirements for immunity to RF voltages .45
4.7 Immunity requirements for the enclosure port .49
5 Immunity measurements.57
5.1 General conditions during testing .57
5.2 Performance assessment .59
5.3 Measurement of input immunity.63
5.4 Measurement of immunity to RF voltage (common mode) at antenna terminal.65
5.5 Measurement of screening effectiveness .69
5.6 Measurement of electrical transients .71
5.7 Measurement of immunity to induced voltages .71
5.8 Measurement of immunity from radiated fields.77
5.9 Measurement of electrostatic discharge.83
6 Interpretation of CISPR immunity limits .83
6.1 Significance of a CISPR limit.83
6.2 Compliance with limits on a statistical basis .83

Annex A (normative) Specification of the test-TV-set .103
Annex B (normative) Specification of filters and weighting network .105
Annex C (normative)  Specification of coupling units and of low-pass filter .109
Annex D (normative) Matching networks and mains stop filter.123
Annex E (normative) Construction information for the open stripline and for the mains
and loudspeaker band-stop filter .127
Annex F (normative) Calibration of the open stripline.139
Annex G (normative) Ferrite core sizes and materials .145
Annex H (informative) Frequency bands .147
Annex I (normative)  Broadcast receivers for digital signals .149
Annex J (informative)  Specification of the wanted signal.157
Annex K (informative)  Objective evaluation of picture quality .167

Bibliography.175

CISPR 20 © IEC:2006 – 5 –
Figure 1 – Examples of ports .23
Figure 2 – Audio power output measurement .85
Figure 3 – Measuring set-up for input immunity measurement of sound broadcast
receivers.85
Figure 4 – Measuring set-up for input immunity measurement of television receivers
and video tape equipment.87
Figure 5 – General principle of the current injection method.89
Figure 6 – Measurement principle for the immunity from conducted currents.91
Figure 7 – Measuring set-up for the screening effectiveness.93
Figure 8 – Measurement of immunity from induced voltages at mains input,
headphones, speakers, audio output, audio input .95
Figure 9 – Example of the arrangement of an open stripline TEM device in combination
with absorbing plates inside a screened room with dimensions of 3 m x 3,5 m .97
Figure 10 – Measurement of the immunity of broadcast receivers from radiated fields
in the frequency range 0,15 MHz to 150 MHz in an open stripline .99
Figure 11 – Measurement of the immunity from RF e.m. field, keyed carrier, using a
dummy GSM portable telephone .101
Figure B.1 – Band-pass filter 0,5 kHz to 3 kHz.105
Figure C.1 – Coupling unit type AC (for coaxial antenna input) .115
Figure C.2 – Coupling unit type MC (for mains lead) .117
Figure C.3 – Coupling unit type LC (for loudspeaker leads) .119
Figure C.4 – Coupling unit type Sr with load resistances.119
Figure C.5 – Measuring set-up to check the insertion loss of the coupling units in the
frequency range 30 MHz to 150 MHz .121
Figure D.1 – RC network for audio inputs (RC ) .123
i
Figure D.2 – RC network for audio outputs (RC ) .123
o
Figure D.3 – Mains stop filter (MSF) .125
Figure E.1 – Open stripline TEM device, basic configuration with matching network
and terminating impedance .127
Figure E.2 – Overview of an open stripline TEM device.129
Figure E.3 – Constructional details of an open stripline, TEM device .131
Figure E.4 – Supplementary constructional details of the open stripline TEM device.133
Figure E.5 – Matching network MN .133
Figure E.6 – Terminating impedance TI .133
Figure E.7 – Band-stop filter type MBS circuit (for mains connection) .135
Figure E.8 – Band-stop filter type LBS (for loudspeaker connection) .137
Figure F.1 – Circuit arrangement for calibration of the measuring set-up.141
Figure F.2 – Example of additional arrangement for enquiry of the calibration curve .143
Figure F.3 – Calibration curve.143
Figure K.1 – Measuring set-up for objective picture evaluation for EUT equipped with
a display .173
Figure K.2 – Measuring set-up for objective picture evaluation for EUT without a
display.173

CISPR 20 © IEC:2006 – 7 –
Table 1 – Survey (non exhaustive) of receiver and associated equipment types,
including the appropriate parts of multifunction equipment .19
Table 2 – Antenna port .29
Table 3 – Limits of input immunity from unwanted signals outside the FM range (see
also 5.3.1.2 for the wanted signal) .29
Table 4 – Limits of input immunity from unwanted signals inside the FM range (see
also 5.3.1.3 for the wanted signal) .31
Table 5 – Limits of input immunity of television receivers for systems B, G and I .33
Table 5a – Limits of input immunity of television receivers for system L .35
Table 5b – Limits of input immunity of television receivers for systems D-SECAM, K-
SECAM (used in Russia).35
Table 5c – Limits of input immunity of television receivers for systems PAL D/K (used
in central Europe) .37
Table 5d – Limits of input immunity of television receivers for system M-NTSC with a
58,75 MHz IF video carrier (used in Japan).37
Table 6 – Limits of input immunity of television receivers .39
Table 7 – Limits of input immunity of satellite television receivers .39
Table 7a – Limits of input immunity of satellite television receivers (Used in Japan,
Korea) .41
Table 8 – Limits of immunity to RF voltages (common mode) of antenna terminals .41
Table 8a – Limits of screening effectiveness of the coaxial antenna terminals .43
Table 9 – Loudspeakers/headphone output port.43
Table 10 – Audio input/output port (excluding loudspeaker and headphone) .45
Table 11 – Power input port .45
Table 12 – Limits of immunity to RF voltages of mains, loudspeaker and headphone
terminals.47
Table 13 – Limits of immunity to RF voltages of audio input and output terminals
(except loudspeaker and headphone terminals) .47
Table 14 – Additional unwanted signal frequencies to be excluded in tests on sound
and television reception functions. .49
Table 15 – Enclosure port.49
Table 16 – Limits of immunity to ambient electromagnetic fields of FM reception
functions of sound receivers .51
Table 17 – Limits of immunity to ambient electromagnetic fields of television receivers
operating in the reception function .53
Table 18 – Limits of immunity to ambient electromagnetic fields of video tape
equipment in the playback mode.55
Table 19 – Limits of immunity to ambient electromagnetic fields of equipment with
audio or video functions.55
Table 20 – Limits of immunity to ambient electromagnetic fields of camcorders in the
playback mode.57
Table 21 – Function of the connections in Figure 8 .75
Table 22 – Measurement conditions for the test of immunity from conducted voltages .75

CISPR 20 © IEC:2006 – 9 –
Table 23 – Measurement conditions for the test of immunity from radiated fields .81
Table G.1 – Ferrite core sizes and materials.145

CISPR 20 © IEC:2006 – 11 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION

INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
_____________
SOUND AND TELEVISION BROADCAST RECEIVERS
AND ASSOCIATED EQUIPMENT –
IMMUNITY CHARACTERISTICS –
LIMITS AND METHODS OF MEASUREMENT

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard CISPR 20 has been prepared by CISPR, subcommittee I:
Electromagnetic compatibility of information technology equipment, multimedia equipment and
receivers.
This sixth edition of CISPR 20 cancels and replaces the fifth edition published in 2002, its
Amendment 1 (2002) and Amendment 2 (2004).
The document CISPR/I/200/FDIS, circulated to the National Committees as Amendment 3, led
to the publication of the new edition.

CISPR 20 © IEC:2006 – 13 –
The text of this standard is based on the second edition, Amendment 1, Amendment 2 and the
following documents:
FDIS Report on voting
CISPR/I/200/FDIS CISPR/I/216/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of the base publication and its amendments will
remain unchanged until the maintenance result date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
CISPR 20 © IEC:2006 – 15 –
SOUND AND TELEVISION BROADCAST RECEIVERS
AND ASSOCIATED EQUIPMENT –
IMMUNITY CHARACTERISTICS –
LIMITS AND METHODS OF MEASUREMENT

1 Scope and object
This standard for immunity requirements applies to television broadcast receivers, sound
broadcast receivers and associated equipment intended for use in the residential, commercial
and light industrial environment.
This standard describes the methods of measurement and specified limits applicable to sound
and television receivers and to associated equipment with regard to their immunity
characteristics to disturbing signals.
This standard is also applicable to the immunity of outdoor units of direct to home (DTH)
satellite receiving systems for individual reception.
NOTE 1 Receiving systems for collective reception, in particular cable distribution head ends (Community
Antenna Television, CATV) and community reception systems (Master Antenna Television, MATV) are covered by
IEC 60728-2.
NOTE 2 Broadcast receivers for digital signals are covered by Annex I and Annex J.
Immunity requirements are given in the frequency range 0 Hz to 400 GHz. Radio-frequency
tests outside the specified frequency bands or concerning other phenomena than given in this
standard are not required.
The objective of this standard is to define the immunity test requirements for equipment
defined in the scope in relation to continuous and transient, conducted and radiated
disturbances including electrostatic discharges.
These test requirements represent essential electromagnetic immunity requirements.
Test requirements are specified for each port (enclosure or connector) considered.
NOTE 3 This standard does not specify electrical safety requirements for equipment such as protection against
electric shocks, unsafe operation, insulation co-ordination and related dielectric tests.
NOTE 4 In special cases, situations will arise where the level of disturbances may exceed the levels specified in
this standard e.g. where a hand-held transmitter is used in proximity to an equipment. In these instances special
mitigation measures may have to be employed.
The environments encompassed by this standard are residential, commercial and light-
industrial locations, both indoor and outdoor. The following list, although not comprehensive,
gives an indication of locations which are included:
– residential properties, e.g. houses, apartments, etc.;
– retail outlets, e.g. shops, supermarkets, etc.;
– business premises, e.g. offices, banks, etc.;
– areas of public entertainment, e.g. cinemas, public bars, dance halls, etc.;
– outdoor locations, e.g. petrol stations, car parks, amusement and sports centres, etc.;
– light-industrial locations e.g. workshops, laboratories, service centres, etc.;
– car and boat.
CISPR 20 © IEC:2006 – 17 –
Locations which are characterized by their mains power being supplied directly at low voltage
from the public mains are considered to be residential, commercial or light industrial.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
CISPR 16-1-3, Specification for radio disturbance and immunity measuring apparatus and
methods - Part 1-3: Radio disturbance and immunity measuring apparatus - Ancillary
equipment - Disturbance power
IEC 60050(161), International Electrotechnical Vocabulary (IEV) – Chapter 161: Electro-
magnetic compatibility
IEC 60268-1:1985, Sound system equipment – Part 1: General
IEC 61000-4-2, Electromagnetic compatibility (EMC) – Part 4-2: Testing and measurement
techniques – Electrostatic discharge immunity test. Basic EMC Publication
IEC 61000-4-3, Electromagnetic compatibility (EMC) – Part 4-3: Testing and measurement
techniques – Radiated, radio-frequency, electromagnetic field immunity test. Basic EMC
Publication
IEC 61000-4-4, Electromagnetic compatibility (EMC) – Part 4-4: Testing and measurement
techniques – Electrical fast transient/burst immunity test. Basic EMC Publication
IEC 61672-1:2002, Electroacoustics – Sound level meters – Part 1: Specifications
ETS 300 158:1992, Satellite Earth Stations and Systems (SES) – Television Receive Only
(TVRO-FSS) Satellite Earth Stations operating in the 11/12 GHz FSS bands
ETS 300 249:1993, Satellite Earth Stations and Systems (SES) – Television Receive-Only
(TVRO) equipment used in the Broadcasting Satellite Service (BSS)
ITU-R BS.468-4, Measurement of audio-frequency noise voltage level in sound broadcasting
ITU-R BT.471-1:1986, Nomenclature and description of colour bar signals
ITU-R BT.500-10, Methodology for the subjective assessment of the quality of television
pictures
ITU-T J.61, Transmission performance of television circuits designed for use in international
connections
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this standard, the definitions contained in IEC 60050(161) as well as the
following apply.
A non-exhaustive overview of equipment to which the standard is applicable is given in
Table 1. The terminology and abbreviations of Table 1 are also used in other tables.

CISPR 20 © IEC:2006 – 19 –
Table 1 – Survey (non exhaustive) of receiver and associated equipment types,
including the appropriate parts of multifunction equipment
Intended for mains
powering and portable with
external power connection
Battery powered
facility
portable, without
Equipment external power Car radio
With a Without a
connection
connection connection
facility (portable)
facility for an facility for
external an external
antenna antenna
Sound FM FM radio ant. FM radio Portable radio Car radio FM
broadcast PC FM tuner
receivers card
(radio)
LW, MW, SW (AM) AM radio ant. AM radio Car radio AM
(including
PC AM tuner
satellite
card
receivers)
Television broadcast receivers (TV) TV antenna TV Portable TV Car TV
(including satellite receivers) PC TV tuner
card
Associated Video tape/disc With tuner Ass. video Ass. video Portable ass.
equipment equipment tuner Tuner video
(ass.) (recording and/ antenna
or play-back)
Without Ass. video
tuner
Audio tape/disc equipment Ass. audio Portable ass.
audio
Other, e.g. audio amplifiers, Ass. other Portable ass.
decoders, electronic organs other, e.g. infrared
devices
3.1.1
sound receivers
appliances intended for the reception of sound broadcast and similar services for terrestrial,
cable and satellite transmissions; these sound receivers can be digital receivers with digital
incoming signals or receivers with digital processing of digital or analogue incoming signals
3.1.2
television receivers
appliances intended for the reception of television broadcast and similar services for
terrestrial, cable and satellite transmissions; these TV receivers can be digital receivers with
digital incoming signals or receivers with digital processing of digital or analogue incoming
signals
NOTE 1 Modular units which are part of sound or television receiving systems, like tuners, frequency converters,
modulators, etc. are considered to be sound or television receivers respectively.
NOTE 2 Tuners may be provided with a broadcast-satellite-receiving stage and with demodulators, decoders,
demultiplexers, D/A converters, encoders (e.g. NTSC, PAL or SECAM encoders) etc.
NOTE 3 Frequency converters may be provided with a broadcast-satellite-receiving stage and with devices which
convert the signals to other frequency bands.
NOTE 4 Receivers, tuners, or frequency converters may be tuneable or may only be able to receive a fixed
frequency.
CISPR 20 © IEC:2006 – 21 –
3.1.3
associated equipment
appliance either intended to be connected directly to sound or television receivers, or to
generate or to reproduce audio or visual information; excluded are information technology
equipment even if they are intended to be connected to a television broadcast receiver
NOTE Information technology equipment is defined in CISPR 22.
3.1.4
multifunction equipment
appliances in which two or more functions are provided in the same unit, for instance
television reception, radio reception, digital clock, tape-recorder or disc player etc.
3.1.5
disturbance signal
an unwanted signal which may degrade radio reception or cause malfunction in equipment;
specific unwanted signals are simulating disturbance signals, generated under laboratory
conditions
3.1.6
immunity
ability to maintain a specified performance when the equipment is subjected to disturbance
(unwanted) signals of specified levels
NOTE In this standard the specified performance is:
− a specified sound signal-to-interference ratio and/or
− no greater than just perceptible degradation of the picture when a wanted signal and an unwanted signal occur
simultaneously.
3.1.7
input immunity
immunity from unwanted signal voltages present at the antenna input terminal
3.1.8
immunity from conducted voltages
immunity from unwanted signal voltages present at the equipment terminals for audio and
mains input and audio output
3.1.9
immunity from conducted currents
immunity from unwanted signal (common mode) currents present in cables connected to the
equipment
3.1.10
immunity from radiated fields
immunity from unwanted electromagnetic fields present at the equipment
3.1.11
screening effectiveness
characteristic of a coaxial connector terminal to attenuate the transfer of internal voltages into
external fields and vice versa
3.1.12
port
particular interface of the specified apparatus with the external electromagnetic environment
(see Figure 1)
CISPR 20 © IEC:2006 – 23 –
3.1.13
enclosure port
physical boundary of the apparatus through which electromagnetic fields may radiate or
impinge
Enclosure port
AC/DC power input port RF input/output port

Control port
Loudspeaker/ Equipment
headphone output port under test Antenna input port

Video input/output port Audio input/output port

IEC  446/02
Figure 1 – Examples of ports
3.2 Abbreviations
AC/DC Alternate Current/Direct Current
AFC Automatic Frequency Control
AM Amplitude Modulation
BSS Broadcast Satellite System
CATV Community Antenna Television
CD Compact Disc
DTH Direct To Home (satellite receiving systems)
e.m. Electromagnetic (field)
e.m.f. Electro-motive-force
ESD Electrostatic Discharge
EUT Equipment Under Test
FM Frequency Modulation
FSS Fixed Satellite System
GSM Global System for Mobile Communications
ITU-R International Telecommunication Union – Radiocommunications
LW, MW and SW Long Wave, Medium Wave and Short Wave
MATV Master Antenna Television
PC Personal Computer
RF Radio Frequency
r.m.s. Root-mean-square
TEM Transverse Electromagnetic (cell)
4 Immunity requirements
4.1 Performance criteria
4.1.1 Performance criterion A
The equipment shall continue to operate as intended during the test.
No change of actual operating state (for example change of channel) is allowed as a result of
the application of the test.
CISPR 20 © IEC:2006 – 25 –
Multifunction equipment shall for each function meet the relevant requirements.
Evaluation is carried out for audio and video functions.
The equipment is supposed to operate as intended if the criteria of 4.1.1.1 and/or 4.1.1.2 are
fulfilled.
4.1.1.1 Evaluation of audio quality
Unless otherwise specified in this standard, the criterion of compliance with the requirement is
a wanted to unwanted audio signal ratio of ≥40 dB at a wanted audio signal level of 50 mW, or
at another audio signal level specified by the manufacturer.
If the S/N ratio is less than 43 dB, the performance criterion for audio assessment is the
actual S/N ratio minus 3 dB.
In this case, at the beginning of the audio quality evaluation the actual S/N ratio is measured
and noted in the test report as reference value.
For AM sound receivers the criterion is ≥26 dB at 50 mW.
For AM and FM car radios and for broadcast receiver cards for computers the criterion is
≥26 dB at 500 mW.
4.1.1.2 Evaluation of picture quality
In the evaluation of picture interference the wanted test signal produces a standard picture (in
the case of video tape equipment on the screen of the test-tv-set) and the unwanted signal
produces a degradation of the picture. The degradation may be in a number of forms, such as
a superposed pattern, disturbance of synchronization, geometrical distortion, loss of picture
contrast, of colour, etc.
The criterion of compliance with the requirement is just perceptible degradation by
observation of the picture. The screen shall be observed under normal viewing conditions
(brightness 15 lx to 20 lx), at a viewing distance of six times the height of the screen.
The picture quality can also be evaluated by using objective measurement methods; one such
method is described in Annex K.
In the case of video tape equipment the test criteria relate to the picture, assessed on a test-
tv-set, which is connected to the video output terminal of the equipment.
4.1.2 Performance criterion B
The equipment shall continue to operate as intended after the test. No loss of function is
allowed after the test when the apparatus is used as intended, but failures which are
recovered automatically but which cause temporary delay in processing, are permissible. No
change of actual operating state for example change of channel or stored data and settings is
allowed as a result of the application of the test. During the test, degradation of performance
is allowed.
CISPR 20 © IEC:2006 – 27 –
4.2 Applicability
Tests are applied at the relevant connectors and enclosure port of the equipment according to
4.3 through 4.7. Tests shall only be carried out where the relevant port(s) or function exist. If
more than one specific function exists, for example audio functions, then all these functions
shall be tested.
It may be determined from consideration of the electrical characteristics and usage of a
particular equipment that some of the tests are inappropriate and therefore unnecessary. In
such a case it is required that the decision not to test and the rationale leading to this
decision shall be recorded in the test report.
4.2.1 Multifunction equipment
Multifunction equipment which is subjected simultaneously to different clauses of this
standard and/or other standards shall be tested with each function operating in isolation, if
this can be achieved without modifying the equipment internally. The equipment thus tested
shall be deemed to have complied with the requirements of all clauses/standards when each
function has satisfied the requirements of the relevant clause/standard.
For equipment for which it is not practical to test with each function operating in isolation, or
where the isolation of a particular function would result in the equipment being unable to fulfil
its primary function, the equipment shall be deemed to have complied if the relevant
provisi
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