IEC 61326-1:2012

Electrical equipment for measurement, control and laboratory use - EMC requirements - Part 1: General requirements

IEC 61326-1:2012 specifies requirements for immunity and emissions regarding electromagnetic compatibility (EMC) for electrical equipment, operating from a supply or battery of less than 1 000 V a.c. or 1 500 V d.c. or from the circuit being measured. Equipment intended for professional, industrial-process, industrial-manufacturing and educational use is covered by this part. This second edition cancels and replaces the first edition, published in 2005. It constitutes a technical revision. The significant technical changes with respect to the previous edition are:
- the immunity test levels and performance criteria have been reviewed;
- requirements for portable test and measurement equipment have been clarified and amended;
- the description of the electromagnetic environments has been improved.

Matériel électrique de mesure, de commande et de laboratoire - Exigences relatives à la CEM - Partie 1: Exigences générales

IEC 61326-1:2012 énonce les exigences relatives à l'immunité et aux émissions concernant la compatibilité électromagnétique (CEM) pour les matériels électriques fonctionnant à partir d'une source d'alimentation ou d'une batterie inférieure à 1 000 V en courant alternatif ou 1 500 V en courant continu ou à partir du circuit mesuré. Elle concerne les équipements prévus pour un usage professionnel, pour les processus industriels et pour l'enseignement. Cette deuxième édition annule et remplace la première édition parue en 2005. Elle constitue une révision technique. Les modifications techniques significatives par rapport à l'édition antérieure sont:
- les niveaux d'essai d'immunité et les critères de performance ont été revus;
- les exigences concernant le matériel d'essai et de mesure portatif ont été clarifiées et modifiées;
- la description des environnements électromagnétiques a été améliorée.

General Information

• Status: Published
• Publication Date: 09-Jul-2012
• ICS: 17.220.20 - Measurement of electrical and magnetic quantities
• ICS: 25.040.40 - Industrial process measurement and control
• ICS: 33.100.20 - Immunity
• Technical Committee: SC 65A - System aspects
• Drafting Committee: WG 4 - TC 65/SC 65A/WG 4
• Current Stage: DELPUB - Deleted Publication
• Start Date: 26-Oct-2020
• Completion Date: 30-Mar-2018

Relations

• Revises: IEC 61326-1:2005 - Electrical equipment for measurement, control and laboratory use - EMC requirements - Part 1: General requirements
• Effective Date: 05-Sep-2023
• Revises: IEC 61326-1:2005/COR1:2008 - Corrigendum 1 - Electrical equipment for measurement, control and laboratory use - EMC requirements - Part 1: General requirements
• Effective Date: 05-Sep-2023
• Revises: IEC 61326-1:2005/COR2:2010 - Corrigendum 2 - Electrical equipment for measurement, control and laboratory use - EMC requirements - Part 1: General requirements
• Effective Date: 05-Sep-2023
• Revised: IEC 61326-1:2020 - Electrical equipment for measurement, control and laboratory use - EMC requirements - Part 1: General requirements
• Effective Date: 05-Sep-2023

Overview

IEC 61326-1:2012 - "Electrical equipment for measurement, control and laboratory use – EMC requirements – Part 1: General requirements" - specifies electromagnetic compatibility (EMC) requirements for immunity and emissions of electrical equipment operating from supplies below 1 000 V a.c. or 1 500 V d.c., or from the circuit being measured. This second edition (2012) replaces the 2005 edition and provides a technical update that clarifies requirements for portable test and measurement equipment, revises immunity test levels and performance criteria, and improves the description of electromagnetic environments.

Key topics and technical requirements

• Scope and equipment types: Applies to equipment for measurement and test, control, laboratory use, and related accessories intended for professional, industrial-process, industrial-manufacturing and educational environments.
• EMC test plan: Defines how to prepare and document tests including EUT (equipment under test) configuration, composition and assembly, I/O ports, auxiliary equipment, cabling and earthing, operation modes, environmental conditions and EUT software.
• Immunity requirements: Specifies immunity tests and conditions (including environmental and operational prerequisites), and revised performance criteria (A, B, C) that describe acceptable functional degradation and recovery.
• Emissions requirements: Sets measurement conditions and references emission limits (drawn from relevant IEC/CISPR publications) to limit interference with nearby equipment.
• Portable equipment: Annex A details immunity test requirements for portable test and measurement instruments powered from batteries or the measured circuit.
• Documentation and reporting: Requirements for test results, test reports and instructions for use (user documentation should include EMC-related information and limitations).

Applications and who uses it

IEC 61326-1 is intended for:

• Design and EMC engineers developing sensors, laboratory instruments, controllers, measurement systems and test equipment.
• Manufacturers preparing products for industrial, laboratory or educational markets.
• EMC test laboratories and compliance teams performing immunity and emissions testing and producing conformity reports.
• System integrators, procurement and quality managers specifying EMC compliance and assessing equipment suitability for particular electromagnetic environments.
• Technical writers producing user manuals with EMC instructions and installation guidance.

Practical uses include product development and validation, pre-compliance and full compliance testing, procurement specifications, installation guidance for industrial sites, and harmonizing EMC behavior across measurement and control systems.

Related standards

• IEC 61000-2-5 (electromagnetic environment descriptions)
• Relevant CISPR and IEC emission standards referenced for specific limits
• Other parts of the IEC 61326 series for equipment-specific requirements

Keywords: IEC 61326-1, EMC requirements, electromagnetic compatibility, immunity, emissions, test plan, measurement equipment, portable test equipment, laboratory instruments.

Standards Content (Sample)

IEC 61326-1 ®
Edition 2.0 2012-07
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
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
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from

either IEC or IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,

please contact the address below or your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les

microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.

Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette
publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

IEC Central Office Tel.: [phone]
3, rue de Varembé Fax: [phone]
CH-1211 Geneva 20 [e-mail]
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

Useful links:
IEC publications search - www.iec.ch/searchpub Electropedia - www.electropedia.org
The advanced search enables you to find IEC publications The world's leading online dictionary of electronic and
by a variety of criteria (reference number, text, technical electrical terms containing more than 30 000 terms and
committee,…). definitions in English and French, with equivalent terms in
It also gives information on projects, replaced and additional languages. Also known as the International
withdrawn publications. Electrotechnical Vocabulary (IEV) on-line.

IEC Just Published - webstore.iec.ch/justpublished Customer Service Centre - webstore.iec.ch/csc
Stay up to date on all new IEC publications. Just Published If you wish to give us your feedback on this publication
details all new publications released. Available on-line and or need further assistance, please contact the
also once a month by email. Customer Service Centre: [e-mail].

A propos de la CEI
La Commission Electrotechnique Internationale (CEI) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications CEI
Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possédez
l’édition la plus récente, un corrigendum ou amendement peut avoir été publié.

Liens utiles:
Recherche de publications CEI - www.iec.ch/searchpub Electropedia - www.electropedia.org
La recherche avancée vous permet de trouver des Le premier dictionnaire en ligne au monde de termes
publications CEI en utilisant différents critères (numéro de électroniques et électriques. Il contient plus de 30 000
référence, texte, comité d’études,…). termes et définitions en anglais et en français, ainsi que
Elle donne aussi des informations sur les projets et les les termes équivalents dans les langues additionnelles.
publications remplacées ou retirées. Egalement appelé Vocabulaire Electrotechnique
International (VEI) en ligne.
Just Published CEI - webstore.iec.ch/justpublished
Service Clients - webstore.iec.ch/csc
Restez informé sur les nouvelles publications de la CEI.
Just Published détaille les nouvelles publications parues. Si vous désirez nous donner des commentaires sur
Disponible en ligne et aussi une fois par mois par email. cette publication ou si vous avez des questions
contactez-nous: [e-mail].
IEC 61326-1 ®
Edition 2.0 2012-07
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
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; 19.080; 25.040.40; 33.100 ISBN 978-2-8322-0207-4

IEC 61326-1 ®
Edition 2.0 2012-07
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
– 2 – 61326-1 © IEC:2012
CONTENTS
FOREWORD . 4

INTRODUCTION . 6

1 Scope . 7

2 Normative references . 8

3 Terms and definitions . 9

4 General . 11

5 EMC test plan . 12
5.1 General . 12
5.2 Configuration of EUT during testing . 12
5.2.1 General . 12
5.2.2 Composition of EUT . 12
5.2.3 Assembly of EUT . 12
5.2.4 I/O ports . 12
5.2.5 Auxiliary equipment . 12
5.2.6 Cabling and earthing (grounding) . 12
5.3 Operation conditions of EUT during testing . 13
5.3.1 Operation modes . 13
5.3.2 Environmental conditions . 13
5.3.3 EUT software during test . 13
5.4 Specification of functional performance . 13
5.5 Test description . 13
6 Immunity requirements . 13
6.1 Conditions during the tests . 13
6.2 Immunity test requirements . 13
6.3 Random aspects. 16
6.4 Performance criteria . 17
6.4.1 General . 17
6.4.2 Performance criterion A . 17
6.4.3 Performance criterion B . 17
6.4.4 Performance criterion C . 17
7 Emission requirements . 17

7.1 Conditions during measurements . 17
7.2 Emission limits . 18
8 Test results and test report . 18
9 Instructions for use . 18
Annex A (normative) Immunity test requirements for portable test and measurement
equipment powered by battery or from the circuit being measured . 19
Bibliography . 20

Figure 1 – Examples of ports . 11

Table 1 – Immunity test requirements for equipment intended to be used in a basic
electromagnetic environment . 14
Table 2 – Immunity test requirements for equipment intended to be used in an
industrial electromagnetic environment . 15

61326-1 © IEC:2012 – 3 –
Table 3 – Immunity test requirements for equipment intended to be used in a

controlled electromagnetic environment . 16

Table A.1 – Immunity test requirements for portable test and measurement equipment . 19

– 4 – 61326-1 © IEC:2012
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 second edition cancels and replaces the first edition, published in 2005. This edition
constitutes a technical revision.
The significant technical changes with respect to the previous edition are as follows:
– the immunity test levels and performance criteria have been reviewed;
– requirements for portable test and measurement equipment have been clarified and
amended;
– the description of the electromagnetic environments has been improved.

61326-1 © IEC:2012 – 5 –
The text of this standard is based on the following documents:

FDIS Report on voting
65A/628/FDIS 65A/637/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.

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 publication will remain unchanged until
the stability 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.
– 6 – 61326-1 © IEC:2012
INTRODUCTION
Instruments and equipment within the scope of this standard 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
standard 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 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 within IEC 61326-2 series. These should be read in conjunction with the IEC 61326-1
requirements.
61326-1 © IEC:2012 – 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 a.c. or 1 500 V d.c. 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 may 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 standard takes precedence over the corresponding generic
EMC standards.
The following equipment is covered by this standard.
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.

– 8 – 61326-1 © IEC:2012
c) Electrical laboratory equipment

This is equipment which measures, indicates monitors or analyses substances, or is used

to prepare materials, and includes In Vitro Diagnostic (IVD) equipment. This equipment

may also be used in areas other than laboratories, for example self-test IVD equipment

may be used in the home.
Equipment within the scope of this standard might be operated in different electromagnetic

environments; depending on the electromagnetic environment different emission and immunity

test requirements are applicable.

This standard 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.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60050 (all parts), International Electrotechnical Vocabulary (available at
)
IEC 61000-3-2:2005, Electromagnetic compatibility (EMC) – Part 3-2: Limits – Limits for
harmonic current emissions (equipment input current ≤ 16 A per phase)
Amendment 1:2008
Amendment 2:2009
IEC 61000-3-3:2008, 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 61000-3-11:2000, 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 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 measure-
ment techniques – Electrostatic discharge immunity test
IEC 61000-4-3:2006, Electromagnetic compatibility (EMC) – Part 4-3: Testing and measure-
ment techniques – Radiated, radio-frequency, electromagnetic field immunity test
Amendment 1:2007
Amendment 2:2010
61326-1 © IEC:2012 – 9 –
IEC 61000-4-4:2004, Electromagnetic compatibility (EMC) – Part 4-4: Testing and measure-

ment techniques – Electrical fast transient/burst immunity test

Amendment 1:2010
IEC 61000-4-5:2005, Electromagnetic compatibility (EMC) – Part 4-5: Testing and measure-

ment techniques – Surge immunity test

IEC 61000-4-6:2008, Electromagnetic compatibility (EMC) – Part 4-6: Testing and measure-

ment techniques – Immunity to conducted disturbances, induced by radio-frequency fields

IEC 61000-4-8:2009, Electromagnetic compatibility (EMC) – Part 4-8: Testing and measure-

ment techniques – Power frequency magnetic field immunity test
IEC 61000-4-11:2004, Electromagnetic compatibility (EMC) – Part 4-11: Testing and measure-
ment techniques – Voltage dips, short interruptions and voltage variations immunity tests
CISPR 11:2009, Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
Amendment 1:2010
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-161 as well
as the following apply.
3.1
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;
– 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.

3.2
class A equipment
equipment suitable for use in all establishments other than domestic and those directly
connected to a low voltage power supply network which supplies buildings used for domestic
purposes
[SOURCE: derived from CISPR 11:2009, 5.3]
3.3
class B equipment
equipment suitable for use in domestic establishments and in establishments directly
connected to a low voltage power supply network which supplies buildings used for domestic
purposes
[SOURCE: derived from CISPR 11:2009, 5.3]

– 10 – 61326-1 © IEC:2012
3.4
controlled electromagnetic environment

environment usually characterized by recognition and control of EMC threats by users of the

equipment or by design of the installation

3.5
d.c. distribution network
local d.c. electricity supply network in the infrastructure of a certain site or building intended

for connection to the d.c. power port of any type of equipment

3.6
enclosure port
physical boundary of equipment through which electromagnetic fields may radiate or impinge
3.7
functional performance
operational performance characteristics specified by the manufacturer of the equipment,
defining the ability of equipment to achieve the intended functions
3.8
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)
3.9
laboratory
test and measurement area
area that is specifically used for analysis, testing and servicing and where equipment is
operated by trained personnel
3.10
long-distance lines
lines within a building which are longer than 30 m, or which leave the building (including lines
of outdoor installations)
3.11
port
any particular interface of the specific device 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.

61326-1 © IEC:2012 – 11 –
Enclosure port
AC power port
EUT
DC power port I/O port
IEC  1277/12
Figure 1 – Examples of ports
3.12
portable (measuring) instrument
measuring instrument designed to be easily carried by hand and to be connected and
disconnected by the user
[SOURCE: IEC 60050-300:2001, 312-02-18]
3.13
type test
conformity test made on one or more items representative of the production
[SOURCE: IEC 60050-151:2001, 151-16-16]
4 General
Equipment and systems within the scope of this standard can be subjected to various kinds of
electromagnetic disturbances, conducted by power, measurement or control lines, or 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 and individual devices of a system within the scope of this standard 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 standard 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.
The manufacturer shall give information that emissions, which exceed the levels required by
this standard, can occur when equipment is connected to a test object.
NOTE 1 Higher immunity levels, different number of tests and different performance criteria 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.
NOTE 2 In special cases, for example when highly susceptible equipment is being used in close proximity,
additional mitigation measures may have to be employed to reduce the influencing electromagnetic emission
further below the specified limits.
NOTE 3 The manufacturer may elect to perform all tests either on a single EUT or more than one. The testing
sequence is optional.
– 12 – 61326-1 © IEC:2012
5 EMC test plan
5.1 General
An EMC test plan shall be established prior to testing. It shall contain, as a minimum, the

elements given in 5.2 to 5.5.
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 devices, 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. 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.

If not otherwise specified in more specific parts of the IEC 61326 series, electrostatic
discharges shall not be applied to inner pins of plug-in ports or cable connectors (but to
connected connectors accessible during the intended use of the EUT).
5.2.5 Auxiliary equipment
When a variety of devices is provided for use with the EUT, at least one of each type of
device shall be selected to simulate actual operating conditions. Auxiliary devices 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.

61326-1 © IEC:2012 – 13 –
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.

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.
5.3.3 EUT software during test
The software used for simulating the different modes of operation shall be documented. This
software shall represent the estimated worst-case operating mode for normal application.
5.4 Specification of functional performance
For immunity tests, functional performance for each operating mode and test shall be
specified; where possible, as quantitative values.
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 standard. The contents of 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 standard, but only
those which are considered as most critical.
6 Immunity requirements
6.1 Conditions during the tests
The configuration and modes of operation during the tests shall be precisely noted in the test
report.
Tests shall be applied to the relevant ports in accordance with Tables 1 or 2 or 3, as
applicable.
The tests shall be conducted in accordance with the basic standards. The tests shall be
carried out one at a time. If additional measures not described in the basic standards are
required, these measures 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.
– 14 – 61326-1 © IEC:2012
Table 3 gives the immunity requirements for equipment intended to be used in a controlled

electromagnetic environment.
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

intended to be used in a basic electromagnetic environment

Perform-
Basic
Port Phenomenon Test value ance
standard
criterion
Enclosure Electrostatic discharge (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
3 V/m (1,4 GHz to 2 GHz) A
1 V/m (2,0 GHz to 2,7 GHz) A
f
3 A/m (50 Hz, 60 Hz)
Power frequency magnetic field IEC 61000-4-8 A
AC power Voltage dip IEC 61000-4-11 0 % during half cycle B
0 % during 1 cycle B
(including protective  e
C
70 % during 25/30 cycles
earth)
e
Short interruptions
IEC 61000-4-11 0 % during 250/300 cycles
C
Burst
IEC 61000-4-4 1 kV (5/50 ns, 5 kHz)
B
a) b)
Surge
0,5 kV /1 kV
IEC 61000-4-5
B
Conducted RF
IEC 61000-4-6 3 V (150 kHz to 80 MHz)
A
d, g
DC power Burst IEC 61000-4-4 1 kV(5/50 ns, 5 kHz) B

(including protective B
a b
Surge IEC 61000-4-5 0,5 kV /1 kV
earth)
A
Conducted RF IEC 61000-4-6 3 V (150 kHz to 80 MHz)
d
I/O signal/control Burst IEC 61000-4-4 0,5 kV (5/50 ns, 5 kHz) B

(including functional
B
b, c
earth ) Surge IEC 61000-4-5 1 kV

A
d
Conducted RF IEC 61000-4-6 3 V (150 kHz to 80 MHz)
I/O signal/control Burst IEC 61000-4-4 1 kV(5/50 ns, 5 kHz) B
connected directly
a b
to mains supply Surge IEC 61000-4-5 0,5 kV /1 kV B

Conducted RF IEC 61000-4-6 3 V (150 kHz to 80 MHz) A
a
Line to line.
b
Line to ground.
c
Only in the case of long-distance lines (see 3.10).
d
Only in the case of lines >3 m.

e
For example “25/30 cycles" means "25 cycles for 50 Hz test" or "30 cycles for 60 Hz test”.
f
Only to magnetically sensitive equipment. CRT display interference is allowed above 1 A/m.
g
DC connections between parts of equipment/system which are not connected to a d.c. distribution network are
treated as I/O signal/control ports.

61326-1 © IEC:2012 – 15 –
Table 2 – Immunity test requirements for equipment intended
to be used in an industrial electromagnetic environment

Port Phenomenon Basic standard Test value Perform-

ance
criterion
Enclosure Electrostatic discharge (ESD) IEC 61000-4-2 4 kV contact discharge B

8 kV air discharge B
Electromagnetic field IEC 61000-4-3 10 V/m (80 MHz to 1 GHz) A

3 V/m (1,4 GHz to 2 GHz) A
1 V/m (2,0 GHz to 2,7 GHz) A
e
Power frequency magnetic field IEC 61000-4-8 30 A/m (50 Hz, 60 Hz) A
AC power Voltage dip IEC 61000-4-11 0 % during 1 cycle B
g
C
40 % during 10/12 cycles
(including
g C
70 % during 25/30 cycles
protective earth)
C
g
Short interruptions IEC 61000-4-11 0 % during 250/300 cycles

B
Burst IEC 61000-4-4
2 kV(5/50 ns, 5 kHz)
B
a b
Surge IEC 61000-4-5
1 kV /2 kV
A
f
Conducted RF IEC 61000-4-6
3 V (150 kHz to 80 MHz)
f
DC power Burst IEC 61000-4-4 2 kV (5/50 ns, 5 kHz) B
a b
(including Surge IEC 61000-4-5 1 kV /2 kV B
protective earth)
f
Conducted RF IEC 61000-4-6 3 V (150 kHz to 80 MHz) A
d
I/O signal/ control Burst IEC 61000-4-4 1 kV (5/50 ns, 5 kHz) B
(including functional
b, c
Surge IEC 61000-4-5 1 kV B
earth)
d, f
Conducted RF IEC 61000-4-6 3 V (150 kHz to 80 MHz) A
I/O signal/ control Burst IEC 61000-4-4 2 kV (5/50 ns, 5 kHz) B
connected directly
a b
Surge IEC 61000-4-5 1 kV /2 kV B
to mains supply
f
Conducted RF IEC 61000-4-6 3 V (150 kHz to 80 MHz) A

a
Line to line.
b
Line to ground.
c
Only in the case of long-distance lines (see 3.10).
d
Only in the case of lines > 3 m.
e
Only to magnetically sensitive equipment. CRT display interference is allowed above 1 A/m.
f
DC connections between parts of equipment/system which are not connected to a d.c. distribution network are
treated as I/O signal/control ports.
g
For example “25/30 cycles" means "25 cycles for 50 Hz test" or "30 cycles for 60 Hz test”.

– 16 – 61326-1 © IEC:2012
Table 3 – Immunity test requirements for equipment intended
to be used in a controlled electromagnetic environment

Port Phenomenon Basic standard Test value Performan

ce
criterion
Enclosure Electrostatic discharge (ESD) IEC 61000-4-2 4 kV contact discharge B

8 kV air discharge B
Electromagnetic field IEC 61000-4-3 1 V/m (80 MHz to 1 GHz) A

1 V/m (1,4 GHz to 2 GHz) A
1 V/m (2,0 GHz to 2,7 GHz) A
AC power Voltage dip IEC 61000-4-11 0 % during half cycle B
(including Burst IEC 61000-4-4 1 kV (5/50 ns, 5 kHz) B
protective earth)
a b
Surge IEC 61000-4-5 0,5 kV /1 kV B
Conducted RF IEC 61000-4-6 1 V (150 kHz to 80 MHz) A
c, d
DC power Burst IEC 61000-4-4 1 kV (5/50 ns, 5 kHz) B
(including Surge IEC 61000-4-5 Not required -
protective earth)
Conducted RF IEC 61000-4-6 1 V (150 kHz to 80 MHz) A
c
I/O signal/ control Burst IEC 61000-4-4 0,5 kV (5/50 ns, 5 kHz) B
(including
Surge IEC 61000-4-5 Not required -
functional earth)
c
Conducted RF IEC 61000-4-6 1 V (150 kHz to 80 MHz) A
a
Line to line.
b
Line to ground.
c
Only in the case of lines >3 m.
d
DC connections between parts of equipment/system which are not connected to a d.c. distribution network are
treated as I/O signal/control ports.

The manufacturer shall state that equipment fulfilling the requirements in Table 3 is designed
to operate in a controlled electromagnetic environment, i.e. where RF transmitters such as
mobile telephones may not be used in close proximity.
NOTE In general, analysis, test and service laboratories have controlled EM environments, and personnel in
these areas are usually trained to be able to interpret results. Such environments normally contain equipment
which requires protection by devices like Uninterruptible Power Supplies (UPS), filters, or surge suppressers.
Hence, the test values shown in Table 3 are relaxed from those in Table 1.
6.3 Random aspects
The duration of each test and/or the number of tests shall be sufficient to ensure that the
performance criterion is met consistently. Due care shall be taken to avoid a false test pass
due to random effects (for example, due to a timing relationship between the test stimulus and
the operation of the EUT).
NOTE This is of particular concern for EUTs with functionality that can be defined or controlled by software or
firmware.
For instance, in the case of electrostatic discharge testing of a digital device, the EUT should
be exposed to at least 10 discharges at each polarity, test point and test level to exclude
random effects. In case of burst testing, it may be advisable to extend the testing time to more
than 1 min.
61326-1 © IEC:2012 – 17 –
6.4 Performance criteria
6.4.1 General
The general principles (performance criteria) for the evaluation of the immunity test results
are the following.
6.4.2 Performance criterion A
The equipment shall continue to operate as intended during and after the test. No degradation

of performance or loss of function is allowed below a performance level specified by the

manufacturer, when the equipment is used as intended. The performance level may be

replaced by a permissible loss of performance. If the minimum performance level or the
permissible performance loss is not specified by the manufacturer, either of these may be
derived from the product description and documentation and what the user may reasonably
expect from the equipment if used as intended.
6.4.3 Performance criterion B
The equipment shall continue to operate as intended after the test. No degradation of
performance or loss of function is allowed below a performance level specified by the
manufacturer, when the equipment is used as intended. The performance level may be
replaced by a permissible loss of performance. During the test, degradation of performance is
however allowed. No change of actual operating state or stored data is allowed. If the
minimum performance level or the permissible performance loss is not specified by the
manufacturer, either of these may be derived from the product description and documentation
and what the user may reasonably expect from the equipment if used as intended.
EXAMPLE 1 A data tran
...

IEC 61326-1 ®
Edition 2.0 2012-07
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
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les
microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.
Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette
publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

IEC Central Office Tel.: [phone]
3, rue de Varembé Fax: [phone]
CH-1211 Geneva 20 [e-mail]
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

Useful links:
IEC publications search - www.iec.ch/searchpub Electropedia - www.electropedia.org
The advanced search enables you to find IEC publications The world's leading online dictionary of electronic and
by a variety of criteria (reference number, text, technical electrical terms containing more than 30 000 terms and
committee,…). definitions in English and French, with equivalent terms in
It also gives information on projects, replaced and additional languages. Also known as the International
withdrawn publications. Electrotechnical Vocabulary (IEV) on-line.

IEC Just Published - webstore.iec.ch/justpublished Customer Service Centre - webstore.iec.ch/csc
Stay up to date on all new IEC publications. Just Published If you wish to give us your feedback on this publication
details all new publications released. Available on-line and or need further assistance, please contact the
also once a month by email. Customer Service Centre: [e-mail].

A propos de la CEI
La Commission Electrotechnique Internationale (CEI) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications CEI
Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possédez
l’édition la plus récente, un corrigendum ou amendement peut avoir été publié.

Liens utiles:
Recherche de publications CEI - www.iec.ch/searchpub Electropedia - www.electropedia.org
La recherche avancée vous permet de trouver des Le premier dictionnaire en ligne au monde de termes
publications CEI en utilisant différents critères (numéro de électroniques et électriques. Il contient plus de 30 000
référence, texte, comité d’études,…). termes et définitions en anglais et en français, ainsi que
Elle donne aussi des informations sur les projets et les les termes équivalents dans les langues additionnelles.
publications remplacées ou retirées. Egalement appelé Vocabulaire Electrotechnique
International (VEI) en ligne.
Just Published CEI - webstore.iec.ch/justpublished
Service Clients - webstore.iec.ch/csc
Restez informé sur les nouvelles publications de la CEI.
Just Published détaille les nouvelles publications parues. Si vous désirez nous donner des commentaires sur
Disponible en ligne et aussi une fois par mois par email. cette publication ou si vous avez des questions
contactez-nous: [e-mail].
IEC 61326-1 ®
Edition 2.0 2012-07
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
PRICE CODE
INTERNATIONALE
CODE PRIX S
ICS 17.220; 19.080; 25.040.40; 33.100 ISBN 978-2-83220-207-4

– 2 – 61326-1 © IEC:2012
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 8
3 Terms and definitions . 9
4 General . 11
5 EMC test plan . 12
5.1 General . 12
5.2 Configuration of EUT during testing . 12
5.2.1 General . 12
5.2.2 Composition of EUT . 12
5.2.3 Assembly of EUT . 12
5.2.4 I/O ports . 12
5.2.5 Auxiliary equipment . 12
5.2.6 Cabling and earthing (grounding) . 12
5.3 Operation conditions of EUT during testing . 13
5.3.1 Operation modes . 13
5.3.2 Environmental conditions . 13
5.3.3 EUT software during test . 13
5.4 Specification of functional performance . 13
5.5 Test description . 13
6 Immunity requirements . 13
6.1 Conditions during the tests . 13
6.2 Immunity test requirements . 13
6.3 Random aspects. 16
6.4 Performance criteria . 17
6.4.1 General . 17
6.4.2 Performance criterion A . 17
6.4.3 Performance criterion B . 17
6.4.4 Performance criterion C . 17
7 Emission requirements . 17
7.1 Conditions during measurements . 17
7.2 Emission limits . 18
8 Test results and test report . 18
9 Instructions for use . 18
Annex A (normative) Immunity test requirements for portable test and measurement
equipment powered by battery or from the circuit being measured . 19
Bibliography . 20

Figure 1 – Examples of ports . 11

Table 1 – Immunity test requirements for equipment intended to be used in a basic
electromagnetic environment . 14
Table 2 – Immunity test requirements for equipment intended to be used in an
industrial electromagnetic environment . 15

61326-1 © IEC:2012 – 3 –
Table 3 – Immunity test requirements for equipment intended to be used in a
controlled electromagnetic environment . 16
Table A.1 – Immunity test requirements for portable test and measurement equipment . 19

– 4 – 61326-1 © IEC:2012
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 second edition cancels and replaces the first edition, published in 2005. This edition
constitutes a technical revision.
The significant technical changes with respect to the previous edition are as follows:
– the immunity test levels and performance criteria have been reviewed;
– requirements for portable test and measurement equipment have been clarified and
amended;
– the description of the electromagnetic environments has been improved.

61326-1 © IEC:2012 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
65A/628/FDIS 65A/637/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.
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 publication will remain unchanged until
the stability 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.
– 6 – 61326-1 © IEC:2012
INTRODUCTION
Instruments and equipment within the scope of this standard 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
standard 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 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 within IEC 61326-2 series. These should be read in conjunction with the IEC 61326-1
requirements.
61326-1 © IEC:2012 – 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 a.c. or 1 500 V d.c. 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 may 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 standard takes precedence over the corresponding generic
EMC standards.
The following equipment is covered by this standard.
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.

– 8 – 61326-1 © IEC:2012
c) Electrical laboratory equipment
This is equipment which measures, indicates monitors or analyses substances, or is used
to prepare materials, and includes In Vitro Diagnostic (IVD) equipment. This equipment
may also be used in areas other than laboratories, for example self-test IVD equipment
may be used in the home.
Equipment within the scope of this standard might be operated in different electromagnetic
environments; depending on the electromagnetic environment different emission and immunity
test requirements are applicable.
This standard 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.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60050 (all parts), International Electrotechnical Vocabulary (available at
)
IEC 61000-3-2:2005, Electromagnetic compatibility (EMC) – Part 3-2: Limits – Limits for
harmonic current emissions (equipment input current ≤ 16 A per phase)
Amendment 1:2008
Amendment 2:2009
IEC 61000-3-3:2008, 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 61000-3-11:2000, 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 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 measure-
ment techniques – Electrostatic discharge immunity test
IEC 61000-4-3:2006, Electromagnetic compatibility (EMC) – Part 4-3: Testing and measure-
ment techniques – Radiated, radio-frequency, electromagnetic field immunity test
Amendment 1:2007
Amendment 2:2010
61326-1 © IEC:2012 – 9 –
IEC 61000-4-4:2004, Electromagnetic compatibility (EMC) – Part 4-4: Testing and measure-
ment techniques – Electrical fast transient/burst immunity test
Amendment 1:2010
IEC 61000-4-5:2005, Electromagnetic compatibility (EMC) – Part 4-5: Testing and measure-
ment techniques – Surge immunity test
IEC 61000-4-6:2008, Electromagnetic compatibility (EMC) – Part 4-6: Testing and measure-
ment techniques – Immunity to conducted disturbances, induced by radio-frequency fields
IEC 61000-4-8:2009, Electromagnetic compatibility (EMC) – Part 4-8: Testing and measure-
ment techniques – Power frequency magnetic field immunity test
IEC 61000-4-11:2004, Electromagnetic compatibility (EMC) – Part 4-11: Testing and measure-
ment techniques – Voltage dips, short interruptions and voltage variations immunity tests
CISPR 11:2009, Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
Amendment 1:2010
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-161 as well
as the following apply.
3.1
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;
– 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.
3.2
class A equipment
equipment suitable for use in all establishments other than domestic and those directly
connected to a low voltage power supply network which supplies buildings used for domestic
purposes
[SOURCE: derived from CISPR 11:2009, 5.3]
3.3
class B equipment
equipment suitable for use in domestic establishments and in establishments directly
connected to a low voltage power supply network which supplies buildings used for domestic
purposes
[SOURCE: derived from CISPR 11:2009, 5.3]

– 10 – 61326-1 © IEC:2012
3.4
controlled electromagnetic environment
environment usually characterized by recognition and control of EMC threats by users of the
equipment or by design of the installation
3.5
d.c. distribution network
local d.c. electricity supply network in the infrastructure of a certain site or building intended
for connection to the d.c. power port of any type of equipment
3.6
enclosure port
physical boundary of equipment through which electromagnetic fields may radiate or impinge
3.7
functional performance
operational performance characteristics specified by the manufacturer of the equipment,
defining the ability of equipment to achieve the intended functions
3.8
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)
3.9
laboratory
test and measurement area
area that is specifically used for analysis, testing and servicing and where equipment is
operated by trained personnel
3.10
long-distance lines
lines within a building which are longer than 30 m, or which leave the building (including lines
of outdoor installations)
3.11
port
any particular interface of the specific device 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.

61326-1 © IEC:2012 – 11 –
Enclosure port
AC power port
EUT
DC power port I/O port
IEC  1277/12
Figure 1 – Examples of ports
3.12
portable (measuring) instrument
measuring instrument designed to be easily carried by hand and to be connected and
disconnected by the user
[SOURCE: IEC 60050-300:2001, 312-02-18]
3.13
type test
conformity test made on one or more items representative of the production
[SOURCE: IEC 60050-151:2001, 151-16-16]
4 General
Equipment and systems within the scope of this standard can be subjected to various kinds of
electromagnetic disturbances, conducted by power, measurement or control lines, or 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 and individual devices of a system within the scope of this standard 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 standard 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.
The manufacturer shall give information that emissions, which exceed the levels required by
this standard, can occur when equipment is connected to a test object.
NOTE 1 Higher immunity levels, different number of tests and different performance criteria 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.
NOTE 2 In special cases, for example when highly susceptible equipment is being used in close proximity,
additional mitigation measures may have to be employed to reduce the influencing electromagnetic emission
further below the specified limits.
NOTE 3 The manufacturer may elect to perform all tests either on a single EUT or more than one. The testing
sequence is optional.
– 12 – 61326-1 © IEC:2012
5 EMC test plan
5.1 General
An EMC test plan shall be established prior to testing. It shall contain, as a minimum, the
elements given in 5.2 to 5.5.
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 devices, 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. 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.
If not otherwise specified in more specific parts of the IEC 61326 series, electrostatic
discharges shall not be applied to inner pins of plug-in ports or cable connectors (but to
connected connectors accessible during the intended use of the EUT).
5.2.5 Auxiliary equipment
When a variety of devices is provided for use with the EUT, at least one of each type of
device shall be selected to simulate actual operating conditions. Auxiliary devices 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.

61326-1 © IEC:2012 – 13 –
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.
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.
5.3.3 EUT software during test
The software used for simulating the different modes of operation shall be documented. This
software shall represent the estimated worst-case operating mode for normal application.
5.4 Specification of functional performance
For immunity tests, functional performance for each operating mode and test shall be
specified; where possible, as quantitative values.
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 standard. The contents of 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 standard, but only
those which are considered as most critical.
6 Immunity requirements
6.1 Conditions during the tests
The configuration and modes of operation during the tests shall be precisely noted in the test
report.
Tests shall be applied to the relevant ports in accordance with Tables 1 or 2 or 3, as
applicable.
The tests shall be conducted in accordance with the basic standards. The tests shall be
carried out one at a time. If additional measures not described in the basic standards are
required, these measures 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.
– 14 – 61326-1 © IEC:2012
Table 3 gives the immunity requirements for equipment intended to be used in a controlled
electromagnetic environment.
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
intended to be used in a basic electromagnetic environment
Perform-
Basic
Port Phenomenon Test value ance
standard
criterion
Enclosure Electrostatic discharge (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
3 V/m (1,4 GHz to 2 GHz) A
1 V/m (2,0 GHz to 2,7 GHz) A
f
3 A/m (50 Hz, 60 Hz)
Power frequency magnetic field IEC 61000-4-8 A
AC power Voltage dip IEC 61000-4-11 0 % during half cycle B
0 % during 1 cycle B
(including protective  e
C
70 % during 25/30 cycles
earth)
e
Short interruptions
IEC 61000-4-11 0 % during 250/300 cycles
C
Burst
IEC 61000-4-4 1 kV (5/50 ns, 5 kHz)
B
a) b)
Surge
0,5 kV /1 kV
IEC 61000-4-5
B
Conducted RF
IEC 61000-4-6 3 V (150 kHz to 80 MHz)
A
d, g
DC power Burst IEC 61000-4-4 1 kV(5/50 ns, 5 kHz) B

(including protective B
a b
Surge IEC 61000-4-5 0,5 kV /1 kV
earth)
A
Conducted RF IEC 61000-4-6 3 V (150 kHz to 80 MHz)
d
I/O signal/control Burst IEC 61000-4-4 0,5 kV (5/50 ns, 5 kHz) B

(including functional
B
b, c
earth ) Surge IEC 61000-4-5 1 kV

A
d
Conducted RF IEC 61000-4-6 3 V (150 kHz to 80 MHz)
I/O signal/control Burst IEC 61000-4-4 1 kV(5/50 ns, 5 kHz) B
connected directly
a b
to mains supply Surge IEC 61000-4-5 0,5 kV /1 kV B

Conducted RF IEC 61000-4-6 3 V (150 kHz to 80 MHz) A
a
Line to line.
b
Line to ground.
c
Only in the case of long-distance lines (see 3.10).
d
Only in the case of lines >3 m.

e
For example “25/30 cycles" means "25 cycles for 50 Hz test" or "30 cycles for 60 Hz test”.
f
Only to magnetically sensitive equipment. CRT display interference is allowed above 1 A/m.
g
DC connections between parts of equipment/system which are not connected to a d.c. distribution network are
treated as I/O signal/control ports.

61326-1 © IEC:2012 – 15 –
Table 2 – Immunity test requirements for equipment intended
to be used in an industrial electromagnetic environment
Port Phenomenon Basic standard Test value Perform-
ance
criterion
Enclosure Electrostatic discharge (ESD) IEC 61000-4-2 4 kV contact discharge B
8 kV air discharge B
Electromagnetic field IEC 61000-4-3 10 V/m (80 MHz to 1 GHz) A
3 V/m (1,4 GHz to 2 GHz) A
1 V/m (2,0 GHz to 2,7 GHz) A
e
Power frequency magnetic field IEC 61000-4-8 30 A/m (50 Hz, 60 Hz) A
AC power Voltage dip IEC 61000-4-11 0 % during 1 cycle B
g
C
40 % during 10/12 cycles
(including
g C
70 % during 25/30 cycles
protective earth)
C
g
Short interruptions IEC 61000-4-11 0 % during 250/300 cycles

B
Burst IEC 61000-4-4
2 kV(5/50 ns, 5 kHz)
B
a b
Surge IEC 61000-4-5
1 kV /2 kV
A
f
Conducted RF IEC 61000-4-6
3 V (150 kHz to 80 MHz)
f
DC power Burst IEC 61000-4-4 2 kV (5/50 ns, 5 kHz) B
a b
(including Surge IEC 61000-4-5 1 kV /2 kV B
protective earth)
f
Conducted RF IEC 61000-4-6 3 V (150 kHz to 80 MHz) A
d
I/O signal/ control Burst IEC 61000-4-4 1 kV (5/50 ns, 5 kHz) B
(including functional
b, c
Surge IEC 61000-4-5 1 kV B
earth)
d, f
Conducted RF IEC 61000-4-6 3 V (150 kHz to 80 MHz) A
I/O signal/ control Burst IEC 61000-4-4 2 kV (5/50 ns, 5 kHz) B
connected directly
a b
Surge IEC 61000-4-5 1 kV /2 kV B
to mains supply
f
Conducted RF IEC 61000-4-6 3 V (150 kHz to 80 MHz) A

a
Line to line.
b
Line to ground.
c
Only in the case of long-distance lines (see 3.10).
d
Only in the case of lines > 3 m.
e
Only to magnetically sensitive equipment. CRT display interference is allowed above 1 A/m.
f
DC connections between parts of equipment/system which are not connected to a d.c. distribution network are
treated as I/O signal/control ports.
g
For example “25/30 cycles" means "25 cycles for 50 Hz test" or "30 cycles for 60 Hz test”.

– 16 – 61326-1 © IEC:2012
Table 3 – Immunity test requirements for equipment intended
to be used in a controlled electromagnetic environment
Port Phenomenon Basic standard Test value Performan
ce
criterion
Enclosure Electrostatic discharge (ESD) IEC 61000-4-2 4 kV contact discharge B
8 kV air discharge B
Electromagnetic field IEC 61000-4-3 1 V/m (80 MHz to 1 GHz) A
1 V/m (1,4 GHz to 2 GHz) A
1 V/m (2,0 GHz to 2,7 GHz) A
AC power Voltage dip IEC 61000-4-11 0 % during half cycle B
(including Burst IEC 61000-4-4 1 kV (5/50 ns, 5 kHz) B
protective earth)
a b
Surge IEC 61000-4-5 0,5 kV /1 kV B
Conducted RF IEC 61000-4-6 1 V (150 kHz to 80 MHz) A
c, d
DC power Burst IEC 61000-4-4 1 kV (5/50 ns, 5 kHz) B
(including Surge IEC 61000-4-5 Not required -
protective earth)
Conducted RF IEC 61000-4-6 1 V (150 kHz to 80 MHz) A
c
I/O signal/ control Burst IEC 61000-4-4 0,5 kV (5/50 ns, 5 kHz) B
(including
Surge IEC 61000-4-5 Not required -
functional earth)
c
Conducted RF IEC 61000-4-6 1 V (150 kHz to 80 MHz) A
a
Line to line.
b
Line to ground.
c
Only in the case of lines >3 m.
d
DC connections between parts of equipment/system which are not connected to a d.c. distribution network are
treated as I/O signal/control ports.

The manufacturer shall state that equipment fulfilling the requirements in Table 3 is designed
to operate in a controlled electromagnetic environment, i.e. where RF transmitters such as
mobile telephones may not be used in close proximity.
NOTE In general, analysis, test and service laboratories have controlled EM environments, and personnel in
these areas are usually trained to be able to interpret results. Such environments normally contain equipment
which requires protection by devices like Uninterruptible Power Supplies (UPS), filters, or surge suppressers.
Hence, the test values shown in Table 3 are relaxed from those in Table 1.
6.3 Random aspects
The duration of each test and/or the number of tests shall be sufficient to ensure that the
performance criterion is met consistently. Due care shall be taken to avoid a false test pass
due to random effects (for example, due to a timing relationship between the test stimulus and
the operation of the EUT).
NOTE This is of particular concern for EUTs with functionality that can be defined or controlled by software or
firmware.
For instance, in the case of electrostatic discharge testing of a digital device, the EUT should
be exposed to at least 10 discharges at each polarity, test point and test level to exclude
random effects. In case of burst testing, it may be advisable to extend the testing time to more
than 1 min.
61326-1 © IEC:2012 – 17 –
6.4 Performance criteria
6.4.1 General
The general principles (performance criteria) for the evaluation of the immunity test results
are the following.
6.4.2 Performance criterion A
The equipment shall continue to operate as intended during and after the test. No degradation
of performance or loss of function is allowed below a performance level specified by the
manufacturer, when the equipment is used as intended. The performance level may be
replaced by a permissible loss of performance. If the minimum performance level or the
permissible performance loss is not specified by the manufacturer, either of these may be
derived from the product description and documentation and what the user may reasonably
expect from the equipment if used as intended.
6.4.3 Performance criterion B
The equipment shall continue to operate as intended after the test. No degradation of
performance or loss of function is allowed below a performance level specified by the
manufacturer, when the equipment is used as intended. The performance level may be
replaced by a permissible loss of performance. During the test, degradation of performance is
however allowed. No change of actual operating state or stored data is allowed. If the
minimum performance level or the permissible performance loss is not specified by the
manufacturer, either of these may be derived from the product description and documentation
and what the user may reasonably expect from the equipment if used as intended.
EXAMPLE 1 A data transfer is controlled/checked by parity check or by other means. In the case of
malfunctioning, such as caused by a lightning strike, the data transfer will be repeated automatically. The reduced
data transfer rate at this time is acceptable.
EXAMPLE 2 During testing, an analogue function value may deviate. After the test, the deviation vanishes.
EXAMPLE 3 In the case of a monitor used only for man-machine monitoring, it is acceptable that some
degradation takes place for a short time, such as flashes during the burst application.
EXAMPLE 4 An intended change of the operating state is allowed if self-recoverable.
6.4.4 Performance criterion C
Temporary loss of function is allowed, provided the function is self-recoverable or can be
restored by the operation of the controls.
EXAMPLE 1 In the case of an interruption in the mains longer than the specified buffer time, the power supply
unit of the equipment is switched off. The switch-on may be automatic or carried
...