SIST EN IEC 61326-1:2021

SLOVENSKI STANDARD
01-september-2021
Nadomešča:
SIST EN 61326-1:2013
Električna oprema za merjenje, nadzor in laboratorijsko uporabo - Zahteve za
elektromagnetno združljivost (EMC) - 1. del: Splošne zahteve (IEC 61326-1:2020)
Electrical equipment for measurement, control and laboratory use - EMC requirements -
Part 1: General requirements (IEC 61326-1:2020)
Elektrische Mess-, Steuer-, Regel- und Laborgeräte - EMV-Anforderungen - Teil 1:
Allgemeine Anforderungen (IEC 61326-1:2020)
Matériel électrique de mesure, de commande et de laboratoire - Exigences relatives à la
CEM - Partie 1: Exigences générales (IEC 61326-1:2020)
Ta slovenski standard je istoveten z: EN IEC 61326-1:2021
ICS:
19.080 Električno in elektronsko Electrical and electronic
preskušanje testing
33.100.01 Elektromagnetna združljivost Electromagnetic compatibility
na splošno in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61326-1

NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2021
ICS 25.040.40; 17.220.20; 33.100.20 Supersedes EN 61326-1:2013 and all of its amendments
and corrigenda (if any)
English Version
Electrical equipment for measurement, control and laboratory
use - EMC requirements - Part 1: General requirements
(IEC 61326-1:2020)
Matériel électrique de mesure, de commande et de Elektrische Mess-, Steuer-, Regel- und Laborgeräte - EMV-
laboratoire - Exigences relatives à la CEM - Partie 1: Anforderungen - Teil 1: Allgemeine Anforderungen
Exigences générales (IEC 61326-1:2020)
(IEC 61326-1:2020)
This European Standard was approved by CENELEC on 2020-11-30. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre 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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61326-1:2021 E

European foreword
The text of document 65A/975/FDIS, future edition 3 of IEC 61326-1, prepared by SC 65A "System
aspects" of IEC/TC 65 "Industrial-process measurement, control and automation" was submitted to the
IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 61326-1:2021.
The following dates are fixed:
• latest date by which the document has to be implemented (dop) 2021-12-04
at national level by publication of an identical national
standard or by endorsement
• latest date by which the national standards conflicting with (dow) 2024-06-04
the document have to be withdrawn
This document supersedes EN 61326-1:2013 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association.
Endorsement notice
The text of the International Standard IEC 61326-1:2020 was 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:
IEC 60359 NOTE Harmonized as EN 60359
IEC 61000-6-1:2016 NOTE Harmonized as EN IEC 61000-6-1:2019 (not modified)
IEC 61000-6-2:2016 NOTE Harmonized as EN IEC 61000-6-2:2019 (not modified)
IEC 61010 (series) NOTE Harmonized as EN IEC 61010 (series)
IEC 61326-2 (series) NOTE Harmonized as EN 61326-2 (series)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 1 Where an International Publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-161 1990 International Electrotechnical Vocabulary. - -
Chapter 161: Electromagnetic compatibility
+ A1 1997  - -
+ A2 1998  - -
+ A3 2014  - -
+ A4 2014  - -
+ A5 2015  - -
+ A6 2016  - -
+ A7 2017  - -
+ A8 2018  - -
IEC 61000-3-2 2018 Electromagnetic compatibility (EMC) – Part EN IEC 61000-3-2 2019
3-2: Limits – Limits for harmonic current
emissions (equipment input current ≤16 A
per phase)
IEC 61000-3-3 2013 Electromagnetic compatibility (EMC) - Part EN 61000-3-3 2013
3-3: Limits - Limitation of voltage changes,
voltage fluctuations and flicker in public
low-voltage supply systems, for equipment
with rated current ≤16 A per phase and not
subject to conditional connection
+ A1 2017  + A1 2019
IEC 61000-3-11 2017 Electromagnetic compatibility (EMC) – Part EN IEC 61000-3-11 2019
3-11: Limits – Limitation of voltage
changes, voltage fluctuations and flicker in
public low-voltage supply systems –
Equipment with rated current ≤75 A and
subject to conditional connection
Publication Year Title EN/HD Year
IEC 61000-3-12 2011 Electromagnetic compatibility (EMC) - Part EN 61000-3-12 2011
3-12: Limits - Limits for harmonic currents
produced by equipment connected to
public low-voltage systems with input
current >16 A and ≤75 A per phase
IEC 61000-4-2 2008 Electromagnetic compatibility (EMC) - Part EN 61000-4-2 2009
4-2: Testing and measurement techniques
- Electrostatic discharge immunity test
IEC 61000-4-3 2006 Electromagnetic compatibility (EMC) - Part EN 61000-4-3 2006
4-3 : Testing and measurement techniques
- Radiated, radio-frequency,
electromagnetic field immunity test
+ A1 2007  + A1 2008
+ A2 2010  + A2 2010
IEC 61000-4-4 2012 Electromagnetic compatibility (EMC) - Part EN 61000-4-4 2012
4-4: Testing and measurement techniques
- Electrical fast transient/burst immunity
test
IEC 61000-4-5 2014 Electromagnetic compatibility (EMC) - Part EN 61000-4-5 2014
4-5: Testing and measurement techniques
- Surge immunity test
+ A1 2017  + A1 2017
IEC 61000-4-6 2013 Electromagnetic compatibility (EMC) - Part EN 61000-4-6 2014
4-6: Testing and measurement techniques
- Immunity to conducted disturbances,
induced by radio-frequency fields
IEC 61000-4-8 2009 Electromagnetic compatibility (EMC) - Part EN 61000-4-8 2010
4-8: Testing and measurement techniques
- Power frequency magnetic field immunity
test
IEC 61000-4-11 2020 Electromagnetic compatibility (EMC) - Part EN IEC 61000-4-11 2020
4-11: Testing and measurement
techniques - Voltage dips, short
interruptions and voltage variations
immunity tests for equipment with input
current up to 16 A per phase
CISPR 11 (mod) 2015 Industrial, scientific and medical equipment EN 55011 2016
- Radio-frequency disturbance
characteristics - Limits and methods of
measurement
+ A1 2016  + A1 2017
- -  + A11 2020
+ A2 2019  + A2 2021
IEC 61326-1 ®
Edition 3.0 2020-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical equipment for measurement, control and laboratory use –

EMC requirements –
Part 1: General requirements
Matériel électrique de mesure, de commande et de laboratoire –

Exigences relatives à la CEM –

Partie 1: Exigences générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20; 25.040.40; 33.100.20 ISBN 978-2-8322-8947-1

– 2 – IEC 61326-1:2020 © IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 8
3 Terms, definitions and abbreviations . 9
3.1 Terms and definitions . 9
3.2 Abbreviations . 12
4 General . 12
5 EMC test plan . 12
5.1 General . 12
5.2 Configuration of EUT during testing . 13
5.2.1 General . 13
5.2.2 Composition of EUT . 13
5.2.3 Assembly of EUT . 13
5.2.4 I/O PORTS . 13
5.2.5 AUXILIARY EQUIPMENT . 13
5.2.6 Cabling and earthing (grounding) . 13
5.3 Operation conditions of EUT during testing . 13
5.3.1 Operation modes . 13
5.3.2 Environmental conditions . 14
5.3.3 EUT software during test . 14
5.4 Specification of FUNCTIONAL PERFORMANCE . 14
5.5 Test description . 14
6 Immunity requirements . 14
6.1 Conditions during the tests. 14
6.2 Immunity test requirements . 14
6.3 Random aspects . 17
6.4 Performance criteria . 18
6.4.1 General . 18
6.4.2 Performance criterion A . 18
6.4.3 Performance criterion B . 18
6.4.4 Performance criterion C . 18
7 Emission requirements . 19
7.1 Conditions during measurements . 19
7.2 Emission limits . 19
8 Test results and test report . 19
9 Instructions for use . 20
Annex A (normative) Immunity test requirements for PORTABLE TEST AND MEASUREMENT
EQUIPMENT powered by battery or from the circuit being measured . 21
Annex B (informative) Guide for analysis and assessment for electromagnetic
compatibility. 22
B.1 General . 22
B.2 Risk analysis. 22
B.3 Risk assessment . 22
Bibliography . 24

IEC 61326-1:2020 © IEC 2020 – 3 –
Figure 1 – Examples of ports . 11

Table 1 – Immunity test requirements for equipment intended to be used in a BASIC
ELECTROMAGNETIC ENVIRONMENT . 15
Table 2 – Immunity test requirements for equipment intended to be used in an
INDUSTRIAL ELECTROMAGNETIC ENVIRONMENT . 16
Table 3 – Immunity test requirements for equipment intended to be used in a
CONTROLLED ELECTROMAGNETIC ENVIRONMENT . 17
Table A.1 – Immunity test requirements for PORTABLE TEST AND MEASUREMENT
EQUIPMENT . 21

– 4 – IEC 61326-1:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL EQUIPMENT FOR MEASUREMENT,
CONTROL AND LABORATORY USE –
EMC REQUIREMENTS –
Part 1: General requirements
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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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 IEC 61326-1 has been prepared by subcommittee 65A: System
aspects, of IEC technical committee 65: Industrial-process measurement, control and
automation.
This third edition cancels and replaces the second edition, published in 2012. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
– the immunity test levels and performance criteria have been reviewed;
– requirements for portable test and measurement equipment have been clarified and
amended;
IEC 61326-1:2020 © IEC 2020 – 5 –
– the description of the electromagnetic environments has been improved.
The text of this International Standard is based on the following documents:
FDIS Report on voting
65A/975/FDIS 65A/985/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
In this document, the following print types are used:
• Terms used throughout this document which have been defined in Clause 3: SMALL
CAPITALS
A list of all parts of the IEC 61326 series under the general title Electrical equipment for
measurement, control and laboratory use – EMC requirements, can be found on the IEC
website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 6 – IEC 61326-1:2020 © IEC 2020
INTRODUCTION
Instruments and equipment within the scope of this document may often be geographically
widespread and hence operate under a wide range of environmental conditions.
The limitation of undesired electromagnetic emissions ensures that no other equipment
installed nearby is unduly influenced by the equipment under consideration. The limits are
more or less specified by, and therefore taken from, IEC and International Special Committee
on Radio Interference (CISPR) publications.
However, the equipment should function without undue degradation in an electromagnetic
environment typical for the locations where it is intended to be operated. In this respect, the
document specifies three different types of electromagnetic environment and the levels for
immunity. More detailed information about issues related to electromagnetic environments are
given in IEC TR 61000-2-5. Special risks, involving for example nearby or direct lightning
strikes, circuit-breaking, or exceptionally high electromagnetic radiation in close proximity, are
not covered.
Complex electric and/or electronic systems should require EMC planning in all phases of their
design and installation, taking into consideration the electromagnetic environment, any
special requirements, and the severity of failures.
This part of IEC 61326 specifies the EMC requirements that are generally applicable to all
equipment within its scope. For certain types of equipment, these requirements will be
supplemented or modified by the special requirements of one, or more than one, particular
part IEC 61326-2 (all parts). These should be read in conjunction with the IEC 61326-1
requirements.
IEC 61326-1:2020 © IEC 2020 – 7 –
ELECTRICAL EQUIPMENT FOR MEASUREMENT,
CONTROL AND LABORATORY USE –
EMC REQUIREMENTS –
Part 1: General requirements
1 Scope
This part of IEC 61326 specifies requirements for immunity and emissions regarding electro-
magnetic compatibility (EMC) for electrical equipment, operating from a supply or battery of
less than 1 000 V AC or 1 500 V DC or from the circuit being measured. Equipment intended
for professional, industrial-process, industrial-manufacturing and educational use is covered
by this part. It includes equipment and computing devices for
– measurement and test;
– control;
– LABORATORY use;
– accessories intended for use with the above (such as sample handling equipment),
intended to be used in industrial and non-industrial locations.
Computing devices and assemblies and similar equipment within the scope of information
technology equipment (ITE) and complying with applicable ITE EMC standards can be used in
systems within the scope of this part of IEC 61326 without additional testing, if they are
suitable for the intended electromagnetic environment.
It is generally considered that this product family standard takes precedence over the
corresponding generic EMC standards.
The following equipment is covered by this document.
a) Electrical measurement and test equipment
This is equipment which, by electrical means, measures, indicates or records one or more
electrical or non-electrical quantities, also non-measuring equipment such as signal
generators, measurement standards, power supplies and transducers.
b) Electrical control equipment
This is equipment which controls one or more output quantities to specific values, with
each value determined by manual settings, by local or remote programming, or by one or
more input variables. This includes industrial process measurement and control (IPMC)
equipment, which consists of devices such as:
– process controllers and regulators;
– programmable controllers;
– power supply units for equipment and systems (centralized or dedicated);
– analogue/digital indicators and recorders;
– process instrumentation;
– transducers, positioners, intelligent actuators, etc.
c) Electrical LABORATORY equipment, including In Vitro Diagnostic (IVD) medical equipment
This is equipment used to prepare or analyse materials, or measure, indicate or monitor
physical quantities. This equipment might also be used in areas other than laboratories.

– 8 – IEC 61326-1:2020 © IEC 2020
d) Equipment a), b) or c) as above when being equipped with components having radio
functionality, for example for wireless communication.
Equipment within the scope of this document might be operated in different electromagnetic
environments; depending on the electromagnetic environment different emission and immunity
test requirements are applicable.
This document considers three types of electromagnetic environments:
• BASIC ELECTROMAGNETIC ENVIRONMENT;
• INDUSTRIAL ELECTROMAGNETIC ENVIRONMENT;
• CONTROLLED ELECTROMAGNETIC ENVIRONMENT.
Corresponding immunity test requirements are described in Clause 6.
In terms of emission requirements, equipment shall be classified in Class A or Class B
equipment, as per the requirements and procedure of CISPR 11. The corresponding emission
requirements are described in Clause 7.
The specified emission and immunity requirements aim at achieving electromagnetic
compatibility between equipment covered in this document and other equipment that might
operate at locations with electromagnetic environments considered in this document.
Guidance for an assessment concerning the risk for achieving EMC is given in Annex B.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements 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 60050-161:1990, International Electrotechnical Vocabulary (IEV) – Part 161:
Electromagnetic compatibility
IEC 60050-161:1990/AMD1:1997
IEC 60050-161:1990/AMD2:1998
IEC 60050-161:1990/AMD3:2014
IEC 60050-161:1990/AMD4:2014
IEC 60050-161:1990/AMD5:2015
IEC 60050-161:1990/AMD6:2016
IEC 60050-161:1990/AMD7:2017
IEC 60050-161:1990/AMD8:2018
(available at )
IEC 61000-3-2:2018, Electromagnetic compatibility (EMC) – Part 3-2: Limits – Limits for
harmonic current emissions (equipment input current ≤16 A per phase)
IEC 61000-3-3:2013, Electromagnetic compatibility (EMC) – Part 3-3: Limits – Limitation of
voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for
equipment with rated current ≤16 A per phase and not subject to conditional connection
IEC 61000-3-3:2013/AMD1:2017
IEC 61000-3-11:2017, Electromagnetic compatibility (EMC) – Part 3-11: Limits – Limitation of
voltage changes, voltage fluctuations and flicker in public low-voltage supply systems –
Equipment with rated current ≤75 A and subject to conditional connection

IEC 61326-1:2020 © IEC 2020 – 9 –
IEC 61000-3-12:2011, Electromagnetic compatibility (EMC) – Part 3-12: Limits – Limits for
harmonic currents produced by equipment connected to public low-voltage systems with input
current >16 A and ≤75 A per phase
IEC 61000-4-2:2008, Electromagnetic compatibility (EMC) – Part 4-2: Testing and
measurement techniques – Electrostatic discharge immunity test
IEC 61000-4-3:2006, Electromagnetic compatibility (EMC) – Part 4-3: Testing and
measurement techniques – Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-3:2006/AMD1:2007
IEC 61000-4-3:2006/AMD2:2010
IEC 61000-4-4:2012, Electromagnetic compatibility (EMC) – Part 4-4: Testing and measure-
ment techniques – Electrical fast transient/burst immunity test
IEC 61000-4-5:2014, Electromagnetic compatibility (EMC) – Part 4-5: Testing and
measurement techniques – Surge immunity test
IEC 61000-4-5:2014/AMD1:2017
IEC 61000-4-6:2013, Electromagnetic compatibility (EMC) – Part 4-6: Testing and
measurement techniques – Immunity to conducted disturbances, induced by radio-frequency
fields
IEC 61000-4-8:2009, Electromagnetic compatibility (EMC) – Part 4-8: Testing and
measurement techniques – Power frequency magnetic field immunity test
IEC 61000-4-11:2020, Electromagnetic compatibility (EMC) – Part 4-11: Testing and
measurement techniques – Voltage dips, short interruptions and voltage variations immunity
tests for equipment with input current up to 16 A per phase
CISPR 11:2015, Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
CISPR 11:2015/AMD1:2016
CISPR 11:2015/AMD2:2019
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-161 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
basic electromagnetic environment
environment existing at locations characterized by being supplied directly at low voltage from
the public mains network
EXAMPLES
– residential properties, for example houses, apartments;
– retail outlets, for example shops, supermarkets;
– business premises, for example offices, banks;

– 10 – IEC 61326-1:2020 © IEC 2020
– areas of public entertainment, for example cinemas, public bars, dance halls;
– outdoor locations, for example petrol stations, car parks, amusement and sports centres;
– light-industrial locations, for example workshops, laboratories, service centres.
3.1.2
class A equipment
equipment suitable for use in all locations other than those allocated in residential
environments and those directly connected to a low voltage power supply network which
supplies buildings used for domestic purposes
[SOURCE: derived from CISPR 11:2015, 5.2]
3.1.3
class B equipment
equipment suitable for use in locations in residential environments and in establishments
directly connected to a low voltage power supply network which supplies buildings used for
domestic purposes
[SOURCE: derived from CISPR 11:2015, 5.2]
3.1.4
controlled electromagnetic environment
environment usually characterized by recognition and control of EMC threats by users of the
equipment or by design of the installation
3.1.5
enclosure port
physical boundary of equipment through which electromagnetic fields may radiate or impinge
3.1.6
functional performance
operational performance characteristics defining the ability of equipment to achieve the
intended functions
Note 1 to entry: Characteristics can be based on the related technical documentation.
3.1.7
industrial electromagnetic environment
environment existing at locations characterized by a separate power network, in most cases
supplied from a high- or medium-voltage transformer, dedicated for the supply of installations
feeding manufacturing or similar plants with one or more of the following conditions:
– frequent switching of heavy inductive or capacitive loads;
– high currents and associated magnetic fields;
– presence of Industrial, Scientific and Medical (ISM) equipment (for example, welding
machines)
3.1.8
laboratory
test and measurement area that is specifically used for analysis, testing and servicing and
where equipment is operated by trained personnel
3.1.9
long-distance lines
lines within a building which are longer than 30 m, or which leave the building (including lines
of outdoor installations)
IEC 61326-1:2020 © IEC 2020 – 11 –
3.1.10
port
any particular interface of the specific equipment or system with the external electromagnetic
environment
EXAMPLE See Figure 1 for an example of Equipment Under Test (EUT).
Note 1 to entry: I/O PORTS are input, output or bi-directional, measurement, control, or data PORTS.
Note 2 to entry: Within this document, PORTS intended to be connected with earth potential for functional reasons
(functional earth PORTS) are considered as I/O PORTS.
Note 3 to entry: Within this document, the protective earth PORT (if any) is considered as part of the POWER PORT.

Figure 1 – Examples of ports
3.1.11
power port
port at which a conductor or cable, carrying the electrical input/output power needed for the
operation (functioning), is connected to the equipment
3.1.12
portable test and measurement equipment
test and/or measuring equipment designed to be easily carried by hand and to be connected
and disconnected by the user
3.1.13
type test
conformity test made on one or more items representative of the production
[SOURCE: IEC 60050-151:2001, 151-16-16]
3.1.14
auxiliary equipment
equipment necessary to provide the equipment under test (EUT) with the signals required for
normal operation and equipment to verify the performance of the EUT
3.1.15
performance level
specified operation of equipment under conditions of intended use
3.1.16
degradation (in performance)
an undesired departure in the operational performance of any device, equipment or system
from its intended performance
Note 1 to entry: The term "degradation" can apply to temporary or permanent failure.
[SOURCE: IEC 60050-161:1990, 161-01-19]

– 12 – IEC 61326-1:2020 © IEC 2020
3.1.17
loss of performance
operation of equipment outside a specified PERFORMANCE LEVEL
3.1.18
loss of function
operation of equipment with one (or more) of the equipment’s function unusable
3.2 Abbreviations
AE AUXILIARY EQUIPMENT
EMC electromagnetic compatibility
ESD electrostatic discharge
EUT equipment under test
I/O input/output
RF radio frequency
UPS uninterruptable power supply
4 General
Equipment and systems within the scope of this document can be subjected to various kinds
of electromagnetic disturbances, sources of which include power, measurement or control
lines or those radiated from the environment. The types and levels of disturbances depend on
the particular conditions in which the systems, subsystems or equipment are installed and
operated.
Equipment within the scope of this document can also be a source of electromagnetic
disturbances over a wide frequency range. These disturbances can be conducted through
power and signal lines, or be directly radiated, and can affect the performance of other
equipment, or influence the external electromagnetic environment.
For emissions, the objective of the requirements given in this document is to ensure that the
disturbances generated by the equipment and systems, when operated normally, do not
exceed a level which could prevent other systems from operating as intended. The emission
limits are considered in 7.2.
NOTE 1 Higher immunity levels than those specified can be necessary for particular applications (for example,
when reliable operation of the equipment is essential for safety) or when the equipment is intended for use in
harsher electromagnetic environments. Also, additional tests and different performance criteria can be necessary
for particular applications.
NOTE 2 In special cases, for example when highly susceptible equipment is being used near the EUT, additional
mitigation measures could have to be employed to reduce the influencing electromagnetic emission further below
the specified limits.
The manufacturer may select to perform all tests on either a single EUT or divide the tests
among multiple EUTs. If the latter, each test result shall be traceable to the EUT tested. The
testing sequence is optional.
5 EMC test plan
5.1 General
An EMC test plan shall be established prior to testing. At a minimum, it shall contain the
elements defined in 5.2 to 5.5.

IEC 61326-1:2020 © IEC 2020 – 13 –
It may be determined from consideration of the electrical characteristics and usage of a
particular item of equipment that some tests are inappropriate and therefore unnecessary. In
such cases, the decision not to test shall be recorded in the EMC test plan.
5.2 Configuration of EUT during testing
5.2.1 General
Measurement, control and LABORATORY equipment often consists of systems with no fixed
configuration. The kind, number and installation of different subassemblies within the equip-
ment may vary from system to system. Thus, it is reasonable, and also recommended, not to
test every possible arrangement.
To realistically simulate EMC conditions (related both to emission and immunity), the
equipment assembly shall represent a typical installation as specified by the manufacturer.
Such tests shall be carried out as TYPE TESTS under normal conditions as specified by the
manufacturer.
5.2.2 Composition of EUT
All equipment, racks, modules, boards, etc. significant to EMC and belonging to the EUT shall
be documented. If relevant, the software version shall be documented.
5.2.3 Assembly of EUT
If an EUT has a variety of internal and external configurations, the TYPE TESTS shall be made
with one or more typical configurations that represent normal use in the intended
environment. All types of modules shall be tested at least once. The rationale for this
selection shall be documented in the EMC test plan.
5.2.4 I/O PORTS
Where there are multiple I/O PORTS, which are all of the same type, connecting a cable to just
one of those PORTS is sufficient, provided that it can be shown that the additional cables
would not affect the results significantly.
5.2.5 AUXILIARY EQUIPMENT
When a variety of equipment is provided for use with the EUT, at least one of each type of
equipment shall be selected to simulate actual operating conditions. AUXILIARY EQUIPMENT
may be simulated.
5.2.6 Cabling and earthing (grounding)
The cables and earth (ground) shall be connected to the EUT in accordance with the
manufacturer's specifications. There shall be no additional earth connections.
5.3 Operation conditions of EUT during testing
5.3.1 Operation modes
A selection of representative operation modes shall be made, taking into account that not all
functions, but only the most typical functions of the electronic equipment can be tested. The
estimated worst-case operating modes for normal application shall be selected.

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5.3.2 Environmental conditions
The tests shall be carried out within the manufacturer’s specified environmental operating
range (for example, ambient temperature, humidity, atmospheric pressure), and within the
rated ranges of supply voltage and frequency. The requirements of IEC 61000-4-2 for
environmental conditions shall take precedence over those of the EUT specification
(for example the humidity requirements for ESD).
5.3.3 EUT software during test
The software/firmware and its version used for the operation of the EUT shall be documented.
This software shall represent the estimated worst-case operating mode for normal application.
FUNCTIONAL PERFORMANCE
5.4 Specification of
For immunity tests, FUNCTIONAL PERFORMANCE for each operating mode and test shall be
specified, where possible, as quantitative values, as well as for non-operational states such
as ‘standby’ or ‘battery charging’, when an unintended change of state could occur through
electromagnetic disturbances. If that is not possible, the FUNCTIONAL PERFORMANCE should be
described in the test plan with supporting justification.
5.5 Test description
Each test to be applied shall be specified in the EMC test plan. The description of the tests,
the test methods, the characteristics of the tests, and the test set-ups are given in the basic
standards, which are referred to in 6.2 and 7.2. Additional information needed for the practical
implementation of the tests is given in this document. The contents of the referenced
standards need not be reproduced in the test plan. In some cases, the EMC test plan shall
specify the application in detail.
NOTE Not all known disturbance phenomena have been specified for testing purposes in this document, but only
those which are considered as most critical.
6 Immunity requirements
6.1 Conditions during the tests
The configuration of the EUT and the modes of operation used during the execution of each
test shall be precisely noted in the test report.
Tests shall be applied to the relevant PORTS in accordance with Table 1, Table 2 or Table 3.
The tests shall be conducted in accordance with the basic standards listed in the relevant
table for one phenomenon at a time. If additional test conditions or configurations not
described in the basic standards are required, these conditions or configurations, and their
rationale, shall be documented in the test report.
6.2 Immunity test requirements
Table 1 gives the immunity requirements for equipment intended to be used in a BASIC
ELECTROMAGNETIC ENVIRONMENT.
Table 2 gives the immunity requirements for equipment intended to be used in an INDUSTRIAL
ELECTROMAGNETIC ENVIRONMENT.
Table 3 gives the immunity requirements for equipment intended to be used in a CONTROLLED
ELECTROMAGNETIC ENVIRONMENT.
IEC 61326-1:2020 © IEC 2020 – 15 –
Annex A gives the immunity requirements for PORTABLE TEST AND MEASUREMENT EQUIPMENT
that is powered by battery or from the circuit being measured.
The performance criteria A, B, and C that are mentioned in the following tables are described
in 6.4.
Table 1 – Immunity test requirements for equipment
BASIC ELECTROMAGNETIC ENVIRONMENT
intended to be used in a
Perform-
PORT Phenomenon Basic standard Test value ance
criterion
ENCLOSURE ESD IEC 61000-4-2 ±4 KV contact discharge B
±8 KV air discharge B
Electromagnetic field IEC 61000-4-3 3 V/m (80 MHz to 1 GHz; A
a
1,4 GHz to 6 GHz)
Power frequency IEC 61000-4-8 3 A/m (50 Hz, 60 Hz) A
b
magnetic field
AC power Burst IEC 61000-4-4 ±1 kV (5 kHz or 100 kHz) B
(including
Surge IEC 61000-4-5 ±0,5 kV line-to-line B
protective earth) ±1 kV line-to-ground B
Conducted RF IEC 61000-4-6 3 V (150 kHz to 80 MHz) A
Voltage dip IEC 61000-4-11 0 % during half cycle B
0 % during 1 cycle B
c
70 % during 25/30 cycles C
c
Short interruptions IEC 6
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