EN 55022:2010

SLOVENSKI STANDARD
01-marec-2011
1DGRPHãþD
SIST EN 55022:2007
SIST EN 55022:2007/A1:2008
SIST EN 55022:2007/A2:2011
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Information technology equipment - Radio disturbance characteristics - Limits and
methods of measurement
Einrichtungen der Informationstechnik - Funkstöreigenschaften - Grenzwerte und
Messverfahren
Appareils de traitement de l'information - Caractéristiques des perturbations
radioélectriques - Limites et méthodes de mesure
Ta slovenski standard je istoveten z: EN 55022:2010
ICS:
33.100.10 Emisija Emission
35.020 Informacijska tehnika in Information technology (IT) in
tehnologija na splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 55022
NORME EUROPÉENNE
December 2010
EUROPÄISCHE NORM
ICS 33.100.10 Supersedes EN 55022:2006 + A1:2007 + A2:2010

English version
Information technology equipment -
Radio disturbance characteristics -
Limits and methods of measurement
(CISPR 22:2008, modified)
Appareils de traitement de l'information - Einrichtungen der Informationstechnik -
Caractéristiques des perturbations Funkstöreigenschaften -
radioélectriques - Grenzwerte und Messverfahren
Limites et méthodes de mesure (CISPR 22:2008, modifiziert)
(CISPR 22:2008, modifiée)
This European Standard was approved by CENELEC on 2010-12-01. 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, Croatia, 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

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 55022:2010 E
Foreword
The text of the International Standard CISPR 22:2008, prepared by CISPR SC I, "Electromagnetic
compatibility of information technology equipment, multimedia equipment and receivers", together with
common modifications prepared by the Technical Committee CENELEC TC 210, "Electromagnetic
compatibility (EMC)", was submitted to the Unique Acceptance Procedure and was approved by
CENELEC as EN 55022 on 2010-12-01.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN 55022:2006 + A1:2007 + FprA2:2009.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2011-12-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2013-12-01

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 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 22:2008 was approved by CENELEC as a European
Standard with agreed common modifications as given below.
COMMON MODIFICATIONS
4 Classification of ITE
4.2 Class A ITE
st
Replace the 1 paragraph by:
Class A ITE is a category of all other ITE which satisfies the class A ITE limits but not the class B ITE
limits. The following warning shall be included in the instructions for use:

8 General measurement conditions
8.4 Operation of the EUT
st
Delete the final sentence in the 1 paragraph so that it reads:
The operational conditions of the EUT shall be determined by the manufacturer according to the typical
use of the EUT with respect to the expected highest level of emission. The determined operational mode
and the rationale for the conditions shall be stated in the test report.

- 3 - EN 55022:2010
nd
Replace the last sentence of original 2 paragraph by:
Any mechanical activities should be performed.

9 Method of measurement of conducted disturbance at mains terminals and
telecommunication ports
9.5 EUT arrangement
9.5.1 General
Replace the final paragraph with:
Where this standard gives options for testing particular requirements with a choice of test methods,
compliance can be shown against any of the test methods using the appropriate limit.

NOTE In any situation where the equipment is re-tested, the test method originally chosen should be used in
order to seek consistency of the results.

9.5.2 Tabletop equipment arrangement
In the last line of item a), add "Figure 4", before "Figure 5".

9.6.3.1 Voltage measurement at balanced telecommunication ports intended for connection to
unscreened balanced pairs
Add the following paragraph at the end of the subclause:
Where normal functioning cannot be achieved because of the impact of the ISN on the EUT, the
measurement shall be carried out using the method given in 9.6.3.5.

Annex G
Delete Annex G.
Annex ZA
Update the references to the following CISPR publications:
Publication Year Title EN/HD Year
CISPR 16-1-1 Specification for radio disturbance and immunity EN 55016-1-1 2007
A1 measuring apparatus and methods - A1 2007
Part 1-1: Radio disturbance and immunity
measuring apparatus - Measuring apparatus
CISPR 16-1-4 Specification for radio disturbance and immunity EN 55016-1-4 2007
measuring apparatus and methods -
Part 1-4: Radio disturbance and immunity
measuring apparatus - Ancillary equipment -
Radiated disturbances
Add the following references:
Publication Year Title EN/HD Year
CISPR 16-2-3 2003 Specification for radio disturbance and immunity EN 55016-2-3 2004
A1 2005 measuring apparatus and methods - A1 2005
Part 2-3: Methods of measurement of
disturbances and immunity – Radiated
disturbance measurements
___________
- 5 - EN 55022:2010
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 essential requirements as given in Annex I Article 1(a) of the EC Directive
2004/108/EC, and essential requirements of Article 3.1(b) (emission 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.
______________
CISPR 22
Edition 6.0 2008-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
COMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES
Information technology equipment – Radio disturbance characteristics –
Limits and methods of measurement

Appareils de traitement de l'information – Caractéristiques des perturbations
radioélectriques – Limites et méthodes de mesure

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XC
CODE PRIX
ICS 33.100.10 ISBN 2-8318-9960-5
SC CIS/I/Publication CISPR 22 (2008), Sixth edition/I-SH 01
INFORMATION TECHNOLOGY EQUIPMENT –
RADIO DISTURBANCE CHARACTERISTICS –
LIMITS AND METHODS OF MEASUREMENT

INTERPRETATION SHEET 1
This interpretation sheet has been prepared by CISPR subcommittee I: Electromagnetic
compatibility of information technology equipment, multimedia equipment and receivers, of
IEC technical committee CISPR: International special committee on radio interference.
The text of this interpretation sheet is based on the following documents:
ISH Report on voting
CISPR/I/299/ISH CISPR/I/312/RVD

Full information on the voting for the approval of this interpretation sheet can be found in the
report on voting indicated in the above table.
___________
Introduction:
th
At the CISPR SC I plenary, held on the 27 October 2007, a decision was taken to set the
maintenance date for CISPR 22, Edition 6 to 2012. As a result the work identified within
CISPR/I/279/MCR will not be started for the time being. At the subsequent meeting of CISPR
SC I WG3 it was decided that certain items within the MCR would benefit now from further
clarification and an interpretation sheet would be helpful to users of the standard, with the
intent of including this information in a future amendment to the standard.
This information does not change the standard; it serves only to clarify the points noted.
CISPR SC I WG3 hopes that these clarifications will be of use to users and especially
laboratories testing to CISPR 22, Edition 6.0. The document is based on the comments
received on CISPR/I/290/DC.
Interpretation:
1. Selection of Average detector
CISPR 22 defines limits for radiated emissions at frequencies between 1 GHz and 6 GHz with
respect to both average and peak detectors. CISPR 16-1-1 defines two types of Average
detector for use above 1 GHz. For the limits given in CISPR 22 the appropriate average
detector is the linear average detector defined in 6.4.1 of CISPR 16-1-1:2006 with its
Amendments 1:2006 and 2:2007.
October 2009 ICS 33.100.10
2. Measurement of conducted emissions on cabinets containing multiple items of
equipment
Where the EUT is a cabinet or rack that contains multiple items of equipment that are
powered from an AC power distribution strip and where the AC power distribution strip is an
integral part of the EUT as declared by the manufacturer, the AC power line conducted
emissions should be measured on the input cable of power distribution strip that leaves the
cabinet or rack, not the power cables from the individual items of equipment. This is
consistent with the requirements in 9.5.1 paragraph 1 and sub paragraph c).

___________
October 2009 ICS 33.100.10
– 2 – CISPR 22 © IEC:2008
CONTENTS
FOREWORD.5
INTRODUCTION.7
1 Scope and object .8
2 Normative references.8
3 Definitions .9
4 Classification of ITE.10
4.1 Class B ITE .11
4.2 Class A ITE .11
5 Limits for conducted disturbance at mains terminals and telecommunication ports.11
5.1 Limits of mains terminal disturbance voltage .11
5.2 Limits of conducted common mode (asymmetric mode) disturbance
at telecommunication ports .12
6 Limits for radiated disturbance .13
6.1 Limits below 1 GHz.13
6.2 Limits above 1 GHz .13
7 Interpretation of CISPR radio disturbance limit .14
7.1 Significance of a CISPR limit .14
7.2 Application of limits in tests for conformity of equipment in series production.14
8 General measurement conditions.15
8.1 Ambient noise.15
8.2 General arrangement.15
8.3 EUT arrangement .18
8.4 Operation of the EUT.20
9 Method of measurement of conducted disturbance at mains terminals and
telecommunication ports .21
9.1 Measurement detectors .21
9.2 Measuring receivers .21
9.3 Artificial mains network (AMN) .21
9.4 Ground reference plane .22
9.5 EUT arrangement .22
9.6 Measurement of disturbances at telecommunication ports.24
9.7 Recording of measurements .28
10 Method of measurement of radiated disturbance .28
10.1 Measurement detectors .28
10.2 Measuring receiver below 1 GHz.28
10.3 Antenna below 1 GHz .28
10.4 Measurement site below 1 GHz.29
10.5 EUT arrangement below 1 GHz.30
10.6 Radiated emission measurements above 1 GHz.30
10.7 Recording of measurements .30
10.8 Measurement in the presence of high ambient signals.31
10.9 User installation testing.31
11 Measurement uncertainty.31
Annex A (normative) Site attenuation measurements of alternative test sites .42
Annex B (normative) Decision tree for peak detector measurements.48

CISPR 22 © IEC:2008 – 3 –
Annex C (normative) Possible test set-ups for common mode measurements .49
Annex D (informative) Schematic diagrams of examples of impedance stabilization
networks (ISN) .56
Annex E (informative) Parameters of signals at telecommunication ports .65
Annex F (informative) Rationale for disturbance measurements and methods on
telecommunications ports.68
Annex G (informative) Operational modes for some types of ITE .77
Bibliography .78

Figure 1 – Test site .32
Figure 2 – Minimum alternative measurement site .33
Figure 3 – Minimum size of metal ground plane .33
Figure 4 – Example test arrangement for tabletop equipment (conducted and radiated
emissions) (plan view).34
Figure 5 – Example test arrangement for tabletop equipment (conducted emission
measurement - alternative 1a).35
Figure 6 – Example test arrangement for tabletop equipment (conducted emission
measurement – alternative 1b) .35
Figure 7 – Example test arrangement for tabletop equipment (conducted emission
measurement – alternative 2) .36
Figure 8 – Example test arrangement for floor-standing equipment (conducted emission
measurement) .37
Figure 9 – Example test arrangement for combinations of equipment (conducted
emission measurement) .38
Figure 10 – Example test arrangement for tabletop equipment (radiated emission
measurement).38
Figure 11 – Example test arrangement for floor-standing equipment (radiated emission
measurement) .39
Figure 12 – Example test arrangement for floor-standing equipment with vertical riser
and overhead cables (radiated and conducted emission measurement) .40
Figure 13 – Example test arrangement for combinations of equipment (radiated
emission measurement) .41
Figure A.1 – Typical antenna positions for alternate site NSA measurements.45
Figure A.2 – Antenna positions for alternate site measurements for minimum
recommended volume .46
Figure B.1 – Decision tree for peak detector measurements .48
Figure C.1 – Using CDNs described in IEC 61000-4-6 as CDN/ISNs .50
Figure C.2 – Using a 150 Ω load to the outside surface of the shield ("in situ CDN/ISN") .51
Figure C.3 – Using a combination of current probe and capacitive voltage probe with a
table top EUT.52
Figure C.4 – Calibration fixture.54
Figure C.5 – Flowchart for selecting test method .55
Figure D.1 − ISN for use with unscreened single balanced pairs .56
Figure D.2 − ISN with high longitudinal conversion loss (LCL) for use with either one or
two unscreened balanced pairs .57
Figure D.3 − ISN with high longitudinal conversion loss (LCL) for use with one, two,
three, or four unscreened balanced pairs.58

– 4 – CISPR 22 © IEC:2008
Figure D.4 − ISN, including a 50 Ω source matching network at the voltage measuring
port, for use with two unscreened balanced pairs.59
Figure D.5 − ISN for use with two unscreened balanced pairs .60
Figure D.6 − ISN, including a 50 Ω source matching network at the voltage measuring
port, for use with four unscreened balanced pairs .61
Figure D.7 − ISN for use with four unscreened balanced pairs .62
Figure D.8 − ISN for use with coaxial cables, employing an internal common mode
choke created by bifilar winding an insulated centre-conductor wire and an insulated
screen-conductor wire on a common magnetic core (for example, a ferrite toroid).62
Figure D.9 − ISN for use with coaxial cables, employing an internal common mode
choke created by miniature coaxial cable (miniature semi-rigid solid copper screen or
miniature double-braided screen coaxial cable) wound on ferrite toroids .63
Figure D.10 − ISN for use with multi-conductor screened cables, employing an internal
common mode choke created by bifilar winding multiple insulated signal wires and an
insulated screen-conductor wire on a common magnetic core (for example, a ferrite
toroid) .63
Figure D.11 − ISN for use with multi-conductor screened cables, employing an internal
common mode choke created by winding a multi-conductor screened cable on ferrite
toroids .64
Figure F.1 – Basic circuit for considering the limits with defined TCM impedance of 150 Ω.71
Figure F.2 – Basic circuit for the measurement with unknown TCM impedance .71
Figure F.3 – Impedance layout of the components used in Figure C.2.73
Figure F.4 – Basic test set-up to measure combined impedance of the 150 Ω and
ferrites .74

Table 1 – Limits for conducted disturbance at the mains ports of class A ITE.
Table 2 – Limits for conducted disturbance at the mains ports of class B ITE.12
Table 3 – Limits of conducted common mode (asymmetric mode) disturbance
at telecommunication ports in the frequency range 0,15 MHz to 30 MHz for class A
equipment.12
Table 4 – Limits of conducted common mode (asymmetric mode) disturbance at
telecommunication ports in the frequency range 0,15 MHz to 30 MHz for class B
equipment.12
Table 5 – Limits for radiated disturbance of class A ITE at a measuring distance of 10 m.13
Table 6 – Limits for radiated disturbance of class B ITE at a measuring distance of 10 m.13
Table 7 – Limits for radiated disturbance of Class A ITE at a measurement distance of 3 m.13
Table 8 – Limits for radiated disturbance of Class B ITE at a measurement distance of 3 m.14
Table 9 – Acronyms used in figures.32
Table A.1 – Normalized site attenuation (A (dB)) for recommended geometries with
N
broadband antennas .44
Table F.1 – Summary of advantages and disadvantages of the methods described in
Annex C.69

CISPR 22 © IEC:2008 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
__________
INFORMATION TECHNOLOGY EQUIPMENT –
RADIO DISTURBANCE 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 22 has been prepared by CISPR subcommittee I:
Electromagnetic compatibility of information technology equipment, multimedia equipment and
receivers.
This sixth edition of CISPR 22 cancels and replaces the fifth edition published in 2005, its
Amendment 1 (2005) and Amendment 2 (2006).This edition constitutes a minor revision.
The document CISPR/I/265/FDIS, circulated to the National Committees as Amendment 3, led
to the publication of the new edition.

– 6 – CISPR 22 © IEC:2008
The text of this standard is based on the fifth edition, Amendment 1, Amendment 2 and the
following documents:
FDIS Report on voting
CISPR/I/265/FDIS CISPR/I/271/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 22 © IEC:2008 – 7 –
INTRODUCTION
The scope is extended to the whole radio-frequency range from 9 kHz to 400 GHz, but limits
are formulated only in restricted frequency bands, which is considered sufficient to reach
adequate emission levels to protect radio broadcast and telecommunication services, and to
allow other apparatus to operate as intended at reasonable distance.

– 8 – CISPR 22 © IEC:2008
INFORMATION TECHNOLOGY EQUIPMENT –
RADIO DISTURBANCE CHARACTERISTICS –
LIMITS AND METHODS OF MEASUREMENT

1 Scope and object
This International Standard applies to ITE as defined in 3.1.
Procedures are given for the measurement of the levels of spurious signals generated by the
ITE and limits are specified for the frequency range 9 kHz to 400 GHz for both class A and
class B equipment. No measurements need be performed at frequencies where no limits are
specified.
The intention of this publication is to establish uniform requirements for the radio disturbance
level of the equipment contained in the scope, to fix limits of disturbance, to describe methods
of measurement and to standardize operating conditions and interpretation of results.
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.
IEC 60083:2006, Plugs and socket-outlets for domestic and similar general use standardized in
member countries of IEC
IEC 61000-4-6:2003, Electromagnetic compatibility (EMC) – Part 4-6: Testing and
measurement techniques – Immunity to conducted disturbances, induced by radio-frequency
fields
Amendment 1 (2004)
Amendment 2 (2006)
CISPR 11:2003, Industrial, scientific, and medical (ISM) radio-frequency equipment – Electro-
magnetic disturbance characteristics – Limits and methods of measurement
Amendment 1 (2004)
CISPR 13:2001, Sound and television broadcast receivers and associated equipment – Radio
disturbance characteristics – Limits and methods of measurement
Amendment 1 (2003)
Amendment 2 (2006)
CISPR 16-1-1:2006, Specification for radio disturbance and immunity measuring apparatus and
methods – Part 1-1: Radio disturbance and immunity measuring apparatus – Measuring
apparatus
Amendment 1 (2006)
Amendment 2 (2007)
___________
There exists a consolidated edition 2.2 (2006) including edition 2.0, its Amendment 1 (2004) and its
Amendment 2 (2006).
There exists a consolidated edition 4.1 (2004) including edition 4.0 and its Amendment 1 (2004).
There exists a consolidated edition 4.2 (2006) including edition 4.0, its Amendment 1 (2003) and its
Amendment 2 (2006).
There exists a consolidated edition 2.2 (2007) including edition 2.0, its Amendment 1 (2006) and its
Amendment 2 (2007).
CISPR 22 © IEC:2008 – 9 –
CISPR 16-1-2:2003, Specification for radio disturbance and immunity measuring apparatus and
methods – Part 1-2: Radio disturbance and immunity measuring apparatus – Ancillary
equipment – Conducted disturbances
Amendment 1 (2004)
Amendment 2 (2006)
CISPR 16-1-4:2007, Specification for radio disturbance and immunity measuring apparatus and
methods – Part 1-4: Radio disturbance and immunity measuring apparatus – Ancillary
equipment – Radiated disturbances
CISPR 16-2-3:2006, Specification for radio disturbance and immunity measuring apparatus and
methods – Part 2-3: Methods of measurement of disturbances and immunity – Radiated
disturbance measurements
CISPR 16-4-2:2003, Specification for radio disturbance and immunity measuring apparatus and
methods – Part 4-2: Uncertainties, statistics and limit modelling – Uncertainty in EMC
measurements
3 Definitions
For the purposes of this document the following definitions apply:
3.1
information technology equipment (ITE)
any equipment:
a) which has a primary function of either (or a combination of) entry, storage, display,
retrieval, transmission, processing, switching, or control, of data and of telecommunication
messages and which may be equipped with one or more terminal ports typically operated
for information transfer;
b) with a rated supply voltage not exceeding 600 V.
It includes, for example, data processing equipment, office machines, electronic business
equipment and telecommunication equipment.
Any equipment (or part of the ITE equipment) which has a primary function of radio trans-
mission and/or reception according to the ITU Radio Regulations are excluded from the scope
of this publication.
NOTE Any equipment which has a function of radio transmission and/or reception according to the definitions of
the ITU Radio Regulations should fulfil the national radio regulations, whether or not this publication is also valid.
Equipment, for which all disturbance requirements in the frequency range are explicitly formul-
ated in other IEC or CISPR publications, are excluded from the scope of this publication.
3.2
equipment under test (EUT)
representative ITE or functionally interactive group of ITE (system) which includes one or more
host unit(s) and is used for evaluation purposes
3.3
host unit
part of an ITE system or unit that provides the mechanical housing for modules, which may
contain radio-frequency sources, and may provide power distribution to other ITE. Power
distribution may be a.c., d.c., or both between the host unit(s) and modules or other ITE
___________
There exists a consolidated edition 1.2 (2006) including edition 1.0, its Amendment 1 (2004) and its
Amendment 2 (2006).
There exists a consolidated edition 2.1 (2008) including edition 2.0 and its Amendment 1 (2007).

– 10 – CISPR 22 © IEC:2008
3.4
module
part of an ITE which provides a function and may contain radio-frequency sources
3.5
identical modules and ITE
modules and ITE produced in quantity and within normal manufacturing tolerances to a given
manufacturing specification
3.6
telecommunications/network port
point of connection for voice, data and signalling transfers intended to interconnect widely-
dispersed systems via such means as direct connection to multi-user telecommunications
networks (e.g. public switched telecommunications networks (PSTN) integrated services digital
networks (ISDN), x-type digital subscriber lines (xDSL), etc.), local area networks (e.g.
Ethernet, Token Ring, etc.) and similar networks
NOTE A port generally intended for interconnection of components of an ITE system under test (e.g. RS-232,
IEEE Standard 1284 (parallel printer), Universal Serial Bus (USB), IEEE Standard 1394 (“Fire Wire”), etc.) and used
in accordance with its functional specifications (e.g. for the maximum length of cable connected to it), is not
considered to be a telecommunications/network port under this definition.
3.7
multifunction equipment
information technology equipment in which two or more functions subject to this standard
and/or to other standards are provided in the same unit
NOTE Examples of information technology equipment include
– a personal computer provided with a telecommunication function and/or broadcast reception function;
– a personal computer provided with a measuring function, etc.
3.8
total common mode impedance
TCM impedance
impedance between the cable attached to the EUT port under test and the reference ground
plane
NOTE The complete cable is seen as one wire of the circuit, the ground plane as the other wire of the circuit. The
TCM wave is the transmission mode of electrical energy, which can lead to radiation of electrical energy if the cable
is exposed in the real application. Vice versa, this is also the dominant mode, which results from exposition of the
cable to external electromagnetic fields.
3.9
arrangement
physical layout of the EUT that includes connected peripherals/associated equipment within the
test area
3.10
configuration
mode of operation and other operational conditions of the EUT
3.11
associated equipment
AE
apparatus needed to help exercise the EUT. The associated equipment may be physically
located outside the test area
4 Classification of ITE
ITE is subdivided into two categories denoted class A ITE and class B ITE.

CISPR 22 © IEC:2008 – 11 –
4.1 Class B ITE
Class B ITE is a category of apparatus which satisfies the class B ITE disturbance limits.
Class B ITE is intended primarily for use in the domestic environment and may include:
– equipment with no fixed place of use; for example, portable equipment powered by built-in
batteries;
– telecommunication terminal equipment powered by a telecommunication network;
– personal computers and auxiliary connected equipment.
NOTE The domestic environment is an environment where the use of broadcast radio and television receivers may
be expected within a distance of 10 m of the apparatus concerned.
4.2 Class A ITE
Class A ITE is a category of all other ITE which satisfies the class A ITE limits but not the class
B ITE limits. Such equipment should not be restricted in its sale but the following warning shall
be included in the instructions for use:
Warning
This is a class A product. In a domestic environment this product may cause radio inter-
ference in which case the user may be required to take adequate measures.
5 Limits for conducted disturbance at mains terminals
and telecommunication ports
The equipment under test (EUT) shall meet the limits in Tables 1 and 3 or 2 and 4, as appli-
cable, including the average limit and the quasi-peak limit when using, respectively, an average
detector receiver and quasi-peak detector receiver and measured in accordance with the
methods described in Clause 9. Either the voltage limits or the current limits in Table 3 or 4, as
applicable, shall be met except for the measurement method of C.1.3 where both limits shall
be met. If the average limit is met when using a quasi-peak detector receiver, the EUT shall be
deemed to meet both limits and measurement with the average detector receiver is
unnecessary.
If the reading of the measuring receiver shows fluctuations close to the limit, the reading shall
be observed for at least 15 s at each measurement frequency; the higher reading shall be
recorded with the exception of any brief isolated high reading which shall be ignored.
5.1 Limits of mains terminal disturbance voltage
Table 1 – Limits for conducted disturbance at the mains ports
of class A ITE
Limits
Frequency range
dB(μV)
MHz
Quasi-peak Average
0,15 to 0,50 79 66
0,50 to 30 73 60
NOTE The lower limit shall apply at the transition frequency.

– 12 – CISPR 22 © IEC:2008
Table 2 – Limits for conducted disturbance at the mains ports
of class B ITE
Limits
Frequency range
dB(μV)
MHz
Quasi-peak Average
0,15 to 0,50 66 to 56 56 to 46
0,50 to 5 56 46
5 to 30 60 50
NOTE 1 The lower limit shall apply at the transition frequencies.
NOTE 2 The limit decreases linearly with the logarithm of the frequency in the
range 0,15 MHz to 0,50 MHz.
5.2 Limits of conducted common mode (asymmetric mode) disturbance
)
at telecommunication ports
Table 3 – Limits of conducted common mode (asymmetric mode) disturbance
at telecommunication ports in the frequency range 0,15 MHz to 30 MHz
for class A equipment
Voltage limits Current limits
Frequency range
dB (μV) dB (μA)
MHz
Quasi-peak Average Quasi-peak Average
0,15 to 0,5 97 to 87 84 to 74 53 to 43 40 to 30
0,5 to 30 87 74 43 30
NOTE 1 The limits decrease linearly with the logarithm of the frequency in the range 0,15 MHz to
0,5 MHz.
NOTE 2 The current and voltage disturbance limits are derived for use with an impedance stabilization
network (ISN) which presents a common mode (asymmetric mode) impedance of 150 Ω to the
telecommunication port under test (conversion factor is 20 log 150 / I = 44 dB).
Table 4 – Limits of conducted common mode (asymmetric mode) disturbance
at telecommunication ports in the frequency range 0,15 MHz to 30 MHz
for class B equipment
Voltage limits Current limits
Frequency range
dB(μV) dB(μA)
MHz
Quasi-peak Average Quasi-peak Average
0,15 to 0,5 84 to 74 74 to 64 40 to 30 30 to 20
0,5 to 30 74 64 30 20
NOTE 1 The limits decrease linearly with the logarithm of the frequency in the range 0,15 MHz to 0,5 MHz.
NOTE 2 The current and voltage disturbance limits are derived for use with an impedance stabilization network
(ISN) which presents a common mode (asymmetric mode) impedance of 150 Ω to the telecommunication port
under test (conversion factor is 20 log 150 / I = 44 dB).
___________
)
See 3.6.
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