CISPR 11:2015
(Main)Industrial, scientific and medical equipment - Radio-frequency disturbance characteristics - Limits and methods of measurement
Industrial, scientific and medical equipment - Radio-frequency disturbance characteristics - Limits and methods of measurement
CISPR 11:2015 applies to industrial, scientific and medical electrical equipment operating in the frequency range 0 Hz to 400 GHz and to domestic and similar appliances designed to generate and/or use locally radio-frequency energy. This standard covers emission requirements related to radio-frequency (RF) disturbances in the frequency range of 9 kHz to 400 GHz. Measurements need only be performed in frequency ranges where limits are specified in Clause 6. For ISM RF applications in the meaning of the definition found in the ITU Radio Regulations (see Definition 3.13), this standard covers emission requirements related to radio-frequency disturbances in the frequency range of 9 kHz to 18 GHz. Requirements for ISM RF lighting equipment and UV irradiators operating at frequencies within the ISM frequency bands defined by the ITU Radio Regulations are contained in this standard. Equipment covered by other CISPR product and product family emission standards are excluded from the scope of this standard. This sixth edition cancels and replaces the fifth edition published in 2009 and its Amendment 1 published in 2010. It constitutes a technical revision. It introduces and permits type testing on components of power electronic equipment, systems and installations. Its emission limits apply now to low voltage (LV) a.c. and d.c. power ports, irrespective of the direction of power transmission. Several limits were adapted to the practical test conditions found at test sites. They are also applicable now to power electronic ISM RF equipment used for wireless power transfer (WPT), for instant power supply and charging purposes. The limits in the range 1 GHz to 18 GHz apply now to CW-type disturbances and to fluctuating disturbances in a similar, uniform and technology-neutral way. For these measurements, two alternative methods of measurement are available, the traditional log-AV method and the new APD method. It has the status of a Product Family EMC standard in accordance with IEC Guide 107, Electromagnetic compatibility - Guide to the drafting of electromagnetic compatibility publications (2014).
Appareils industriels, scientifiques et médicaux - Caractéristiques de perturbations radioélectriques - Limites et méthodes de mesure
La CISPR 11:2015 s'applique aux appareils industriels, scientifiques et électromédicaux fonctionnant dans la plage de fréquences de 0 Hz à 400 GHz, ainsi qu'aux appareils domestiques et similaires conçus pour produire et/ou utiliser, dans un espace réduit, de l'énergie radioélectrique. La présente norme couvre les exigences d'émission relatives aux perturbations radioélectriques dans la plage de fréquences de 9 kHz à 400 GHz. Les mesurages sont seulement nécessaires dans les plages de fréquences dans lesquelles les limites sont spécifiées à l'Article 6. Pour les applications industrielles, scientifiques et médicales (ISM) à fréquences radioélectriques, au sens de la définition fournie par le Règlement des radiocommunications de l'UIT (voir Définition 3.13), la présente Norme couvre les exigences d'émission relatives aux perturbations à fréquences radioélectriques dans la plage de fréquence comprise entre 9 kHz et 18 GHz. Les exigences relatives aux appareils d'éclairage ISM à fréquences radioélectriques et aux générateurs de rayonnement UV fonctionnant dans les bandes de fréquences ISM définies par le Règlement des radiocommunications de l'UIT sont spécifiées dans la présente Norme. Les installations couvertes par d'autres normes de produits du CISPR et d'autres normes d'émission de famille de produits n'entrent pas dans le domaine d'application de la présente norme. Cette sixième édition annule et remplace la cinquième édition parue en 2009 et son Amendement 1 paru en 2010. Cette édition constitue une révision technique. Elle introduit et permet des essais de type sur des composants d'appareils, de systèmes et d'installations électroniques d'alimentation. Ses limites d'émission s'appliquent désormais aux accès d'alimentation en courant alternatif et en courant continu à basse tension (BT), quel que soit le sens de la transmission d'énergie. Plusieurs limites ont été adaptées aux conditions d'essai pratiques déterminées sur les sites d'essai. Elles s'appliquent désormais également aux appareils ISM à fréquences radioélectriques électroniques de puissance utilisés pour le transfert de puissance sans fil (WPT), l'alimentation électrique instantanée et les besoins de la mise en charge. Les limites dans la plage comprise entre 1 GHz et 18 GHz s'appliquent désormais aux perturbations de type à ondes entretenues et aux perturbations fluctuantes de manière similaire, uniforme et neutre d'un point de vue technique. Pour ces mesurages, deux autres méthodes de mesure sont disponibles: la méthode Log-AV traditionnelle et la nouvelle méthode APD. Elle a le statut d'une norme de famille de produits en CEM, conformément au Guide 107 de l'IEC, Compatibilité électromagnétique - Guide pour la rédaction des publications sur la compatibilité électromagnétique (2014).
General Information
Relations
Standards Content (Sample)
CISPR 11 ®
Edition 6.0 2015-06
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
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.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
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.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 21 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 16 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.
IEC publications search - webstore.iec.ch/advsearchform IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 67 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
CISPR 11 ®
Edition 6.0 2015-06
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.100.10 ISBN 978-2-8322-2742-8
– 2 – CISPR 11:2015 RLV © IEC 2015
CONTENTS
FOREWORD . 8
INTRODUCTION . 11
1 Scope . 12
2 Normative references . 12
3 Terms and definitions . 13
4 Frequencies designated for ISM use . 16
5 Classification of ISM equipment . 17
5.1 Separation into groups . 17
5.2 Division into classes . 17
5.3 Information Documentation for the user . 17
6 Limits of electromagnetic disturbances . 18
6.1 General . 18
6.2 Group 1 equipment measured on a test site . 18
6.2.1 Limits of terminal disturbance voltage for conducted disturbances . 18
6.2.2 Limits of electromagnetic radiation disturbance. 21
6.3 Group 2 equipment measured on a test site . 22
6.3.1 Limits of terminal disturbance voltage for conducted disturbances . 22
6.3.2 Limits of electromagnetic radiation disturbance. 24
6.4 Group 1 and group 2 class A equipment measured in situ . 31
6.4.1 Limits of terminal disturbance voltage for conducted disturbances . 31
6.4.2 Limits of electromagnetic radiation disturbance. 31
7 Measurement requirements . 33
7.1 General . 33
7.2 Ambient noise . 33
7.3 Measuring equipment . 34
7.3.1 Measuring instruments. 34
7.3.2 Artificial mains network (AN) . 35
7.3.3 Voltage probe . 35
7.3.4 Antennas . 36
7.3.5 Artificial hand . 36
7.4 Frequency measurement . 36
7.5 Configuration of equipment under test. 37
7.5.1 General . 37
7.5.2 Interconnecting cables . 39
7.5.3 Connection to the electricity supply network on a test site . 40
7.6 Load conditions of equipment under test . 42
7.6.1 General . 42
7.6.2 Medical equipment . 43
7.6.3 Industrial equipment . 44
7.6.4 Scientific, laboratory and measuring equipment . 45
7.6.5 Microwave cooking appliances . 45
7.6.6 Other equipment in the frequency range 1 GHz to 18 GHz . 45
7.6.7 Single and multiple-zone induction cooking appliances .
7.6.7 Electric welding equipment . 46
7.6.8 ISM RF lighting equipment . 47
7.6.9 Medium voltage (MV) and high voltage (HV) switchgear . 47
7.6.10 Grid connected power converters . 47
7.7 Recording of test-site measurement results . 47
7.7.1 General . 47
7.7.2 Conducted emissions . 48
7.7.3 Radiated emissions . 48
8 Special provisions for test site measurements (9 kHz to 1 GHz) . 48
8.1 Ground planes . 48
8.2 Measurement of mains terminal disturbance voltage conducted disturbances . 48
8.2.1 General . 48
8.2.2 Measurements on grid connected power converters . 49
8.2.3 Handheld equipment which are normally operated without an earth
connection . 53
8.3 Radiation test site for 9 kHz to 1 GHz . 54
8.3.1 General . 54
8.3.2 Validation of the radiation test site (9 kHz to 1 GHz) . 55
8.3.3 Disposition of equipment under test (9 kHz to 1 GHz) . 55
8.3.4 Radiation measurements (9 kHz to 1 GHz) . 55
8.4 Alternative radiation test sites for the frequency range 30 MHz to 1 GHz . 55
9 Radiation measurements: 1 GHz to 18 GHz . 56
9.1 Test arrangement . 56
9.2 Receiving antenna . 56
9.3 Validation and calibration of test site . 56
9.4 Measuring procedure . 56
9.4.1 General . 56
9.4.2 Operating conditions of the EUT . 57
9.4.3 Preliminary measurement . 57
9.4.4 Final measurement . 58
10 Measurement in situ . 59
11 Safety precautions for emission measurements on ISM RF equipment . 60
12 Assessment of conformity of equipment .
12.1 General .
12.2 Statistical assessment of compliance of series produced equipment .
12.3 Equipment in small-scale production .
12.4 Equipment produced on an individual basis .
12.5 Measurement uncertainty . 61
13 Figures and flowcharts .
Annex A (informative) Examples of equipment classification . 62
Annex B (informative) Precautions to be taken in the use of a spectrum analyzer (see
7.3.1) . 64
Annex C (normative) Measurement of electromagnetic radiation disturbance in the
presence of signals from radio transmitters . 65
Annex D (informative) Propagation of interference from industrial radio-frequency
equipment at frequencies between 30 MHz and 300 MHz . 66
Annex E (informative) Recommendations of CISPR for protection of certain radio
services in particular areas . 67
E.1 Introduction General . 67
E.2 Recommendations for protection of safety-related radio services . 67
– 4 – CISPR 11:2015 RLV © IEC 2015
E.3 Recommendations for protection of specific sensitive radio services . 67
Annex F (informative) Frequency bands allocated for safety-related radio services . 68
Annex G (informative) Frequency bands allocated for sensitive radio services . 69
Annex H (informative) Statistical assessment of series produced equipment against
the requirements of CISPR standards . 71
H.1 Significance of a CISPR limit . 71
H.2 Type tests . 71
H.3 Statistical assessment of series produced equipment . 71
H.3.1 Assessment based on a general margin to the limit . 71
H.3.2 Assessment based on the non-central t-distribution . 72
H.3.3 Assessment based on the binomial distribution . 74
H.3.4 Equipment produced on an individual basis . 74
Annex I (normative) Artificial Network (AN) for the assessment of disturbance
voltages at d.c. power ports of semiconductor power converters . 75
I.1 General information and purpose . 75
I.2 Structures for a DC-AN . 75
I.2.1 AN suitable for measurement of unsymmetrical mode (UM) disturbances . 75
I.2.2 AN suitable for measurement of common mode (CM) and differential
mode (DM) disturbances . 75
I.2.3 AN suitable for measurement of UM, CM and DM disturbances . 76
I.3 Employment of DC-ANs for compliance measurements . 76
I.3.1 General . 76
I.3.2 Pseudo V-AN . 76
I.3.3 Delta-AN . 76
I.4 Normative technical requirements for the DC-AN . 77
I.4.1 Parameters and associated tolerances in the range 150 kHz to 30 MHz . 77
I.4.2 Parameters and associated tolerances in the range 9 kHz to 150 kHz . 78
I.5 Examples of practical implementations of DC-ANs . 78
Annex J (informative) Measurements on Grid Connected Power Converters (GCPC) –
Setups for an effective test site configuration . 81
J.1 General information and purpose . 81
J.2 Setup of the test site . 81
J.2.1 Block diagram of test site . 81
J.2.2 DC power supply . 82
J.2.3 AC power source . 82
J.2.4 Other components . 83
J.3 Other test setups . 83
J.3.1 Configuration comprising laboratory AC power source and resistive load . 83
J.3.2 Configuration in case of reverse power flow to the AC mains . 84
Annex K (informative) Test site configuration and instrumentation – Guidance on
prevention of saturation effects in mitigation filters of transformer-less power
converters during type tests according to this standard. 86
K.1 General information and purpose . 86
K.2 Recommendations for avoidance of saturation effects in the range 9 kHz to
150 kHz . 87
K.3 Detailed advice . 87
K.3.1 General . 87
K.3.2 Insert of series inductors (or common mode chokes) in the laboratory's
d.c. power supply chain . 88
K.3.3 Employment of additional common mode decoupling capacitors at the
interface between the AE port of the DC-AN and the laboratory d.c.
power supply port allocated in the test environment . 89
K.4 Background information . 90
Bibliography . 92
Figure 4 1 – Circuit for disturbance voltage measurements on mains supply (see 7.3.3) . 35
Figure 6 2 – Artificial hand, RC element (see 7.3.5) . 36
Figure 3 – Example for a typical cable arrangement for measurements of radiated
disturbances in 3 m separation distance, Table-top EUT . 38
Figure 4 – Example for a typical test set up for measurement of conducted and/or
radiated disturbances from a floor standing EUT, 3D view . 39
Figure 3 5 – Disposition of medical (capacitive type) and dummy load (see 7.6.2.1) . 43
Figure 6 – Typical arrangement for measurement of conducted disturbances at LV d.c.
power ports with the DC-AN used as termination and decoupling unit to the laboratory
d.c. power source . 51
Figure 7 – Typical arrangement for measurement of conducted disturbances at LV d.c.
power ports with the DC-AN used as termination and voltage probe . 51
Figure 8 – Typical arrangement for measurement of conducted disturbances at LV d.c.
power ports with the DC-AN used as voltage probe and with a current probe – 2D
diagram . 52
Figure 9 – Typical arrangement for measurement of conducted disturbances at LV d.c.
power ports with a DC-AN used as voltage probe and with a current probe – 3D
diagram . 53
Figure 1 10 – Test site . 54
Figure 2 11 – Minimum size of metal ground plane . 54
Figure 5 12 – Decision tree for the measurement of emissions from 1 GHz to 18 GHz
of class B, group 2 ISM equipment operating at frequencies above 400 MHz . 57
Figure H.1 – An example of possible difficulties . 74
Figure I.1 – Practical implementation of a 150 Ω DC-AN suitable for measurement of
UM disturbances (Example) . 78
Figure I.2 – Practical implementation of a 150 Ω DC-AN suitable for measurement of
CM and DM disturbances (Example, see also Figure A.2 in CISPR 16-1-2:2014) . 79
Figure I.3 – Practical implementation of a 150 Ω DC-AN suitable for measurement of
UM, or CM and DM disturbances (Example 1) . 79
Figure I.4 – Practical implementation of a 150 Ω DC-AN suitable for measurement of
UM, or CM and DM disturbances (Example 2) . 80
Figure I.5 – Practical implementation of a 150 Ω DC-AN suitable for measurement of
UM, or CM and DM disturbances (Example 3) . 80
Figure J.1 – Setup of the test site (Case 1) – 2D diagram . 81
Figure J.2 – Setup of the test site (Case 1) – 3D diagram . 82
Figure J.3 – Setup of the test site (Case 2) – 2D diagram . 83
Figure J.4 – Setup of the test site (Case 2) – 3D diagram . 84
Figure J.5 – Setup of the test site (Case 3) – 2D diagram . 85
Figure J.6 – Setup of the test site (Case 3) – 3D diagram . 85
Figure K.1 – Flow of the common mode RF current at test site configuration level . 88
Figure K.2 – Blocking of flow of common mode RF current by insert of series inductors . 89
Figure K.3 – Blocking of flow of common mode RF current by employment of
additional CM decoupling capacitors . 89
– 6 – CISPR 11:2015 RLV © IEC 2015
Figure K.4 – CM termination impedance at the EUT port of a DC-AN – Magnitude-
versus-frequency characteristic in the range 3 kHz to 30 MHz, Example . 90
Figure K.5 – Prevention of saturation of mitigation filters by use of additional
decoupling capacitors . 91
Figure K.6 – Change in the resonant frequency caused by the increase and decrease
in the decoupling capacitor's capacitance . 91
Figure K.7 – DC-AN circuit example where capacitance of blocking capacitors of the
LC decoupling circuit can be increased or decreased . 91
Table 1 – Frequencies in the radio-frequency (RF) range designated by ITU for use as
fundamental ISM frequencies . 16
Table 2 – Mains terminal Disturbance voltage limits for class A group 1 equipment
measured on a test site (a.c. mains power port) . 19
Table 3 – Limits for conducted disturbances of class A group 1 equipment measured
on a test site (d.c. power port) . 20
Table 3 4 – Mains terminal Disturbance voltage limits for class B group 1 equipment
measured on a test site (a.c. mains power port) . 20
Table 5 – Disturbance voltage limits for class B group 1 equipment measured on a test
site (d.c. power port) . 20
Table 4 6 – Electromagnetic radiation disturbance limits for class A group 1 equipment
measured on a test site . 21
Table 5 7 – Electromagnetic radiation disturbance limits for class B group 1 equipment
measured on a test site . 22
Table 6 8 – Mains terminal Disturbance voltage limits for class A group 2 equipment
measured on a test site (a.c. mains power port) . 23
Table 7 9 – Mains terminal Disturbance voltage limits for class B group 2 equipment
measured on a test site (a.c. mains power port) . 23
Table 8 – Mains terminal disturbance voltage limits for induction cooking appliances .
Table 9 10 – Electromagnetic radiation disturbance limits for class A group 2
equipment measured on a test site . 26
Table 10 11 – Electromagnetic radiation disturbance limits for class A EDM and arc
welding equipment measured on a test site . 27
Table 11 12 – Electromagnetic radiation disturbance limits for class B group 2
equipment measured on a test site . 27
Table 12 – Limits of the magnetic field strength for induction cooking appliances
intended for commercial use .
Table 13 – Limits of the magnetic field induced current in a 2 m loop antenna for
induction cooking appliances for domestic use .
Table 14 13 – Electromagnetic radiation disturbance peak limits for group 2 equipment
producing CW type disturbances and operating at frequencies above 400 MHz . 29
Table 15 – Electromagnetic radiation disturbance peak limits for class B group 2
equipment producing fluctuating disturbances other than CW and operating at
frequencies above 400 MHz .
Table 16 14 – Electromagnetic radiation disturbance weighted limits for class B
group 2 equipment producing fluctuating disturbances other than CW and operating at
frequencies above 400 MHz . 29
–1
Table 15 – Electromagnetic radiation disturbance APD level corresponding to 10
limits for class B group 2 equipment operating at frequencies above 400 MHz . 30
Table 17 16 – Electromagnetic radiation disturbance limits for class A group 1
equipment measured in situ . 31
Table 18 17 – Electromagnetic radiation disturbance limits for class A group 2
equipment measured in situ . 32
Table 18 – Frequency sub-ranges to be used for weighted measurements . 59
Table E.1 – Limits for electromagnetic radiation disturbances for in situ measurements
to protect specific safety-related radio services in particular areas . 67
Table H.1 – General margin to the limit for statistical evaluation . 71
Table H.2 – The non-central t-distribution factor k as a function of the sample size n . 73
Table H.3 – Application of the binomial distribution . 74
Table I.1 – Parameters and associated tolerances in the range 150 kHz to 30 MHz . 77
Table I.2 – Parameters and associated tolerances in the range 9 kHz to 150 kHz . 78
– 8 – CISPR 11:2015 RLV © IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
_____________
INDUSTRIAL, SCIENTIFIC AND MEDICAL EQUIPMENT –
RADIO-FREQUENCY DISTURBANCE CHARACTERISTICS –
LIMITS AND METHODS OF MEASUREMENT
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC 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.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition. A vertical bar appears in the margin wherever a change
has been made. Additions are in green text, deletions are in strikethrough red text.
International Standard CISPR 11 has been prepared by CISPR Subcommittee B: Interference
relating to industrial, scientific and medical radio-frequency apparatus, to other (heavy)
industrial equipment, to overhead power lines, to high voltage equipment and to electric
traction.
This sixth edition cancels and replaces the fifth edition published in 2009 and its
Amendment 1 published in 2010. It constitutes a technical revision.
It introduces and permits type testing on components of power electronic equipment, systems
and installations. Its emission limits apply now to low voltage (LV) a.c. and d.c. power ports,
irrespective of the direction of power transmission. Several limits were adapted to the
practical test conditions found at test sites. They are also applicable now to power electronic
ISM RF equipment used for wireless power transfer (WPT), for instant power supply and
charging purposes. The limits in the range 1 GHz to 18 GHz apply now to CW-type
disturbances and to fluctuating disturbances in a similar, uniform and technology-neutral way.
For these measurements, two alternative methods of measurement are available, the
traditional log-AV method and the new APD method.
For measurements at LV d.c. power ports of power electronic equipment, a modern
implementation of the 150 Ω Delta-network specified in CISPR 16-1-2 has been made
available.
This International Standard CISPR 11 has the status of a Product Family EMC standard in
accordance with IEC Guide 107, Electromagnetic compatibility – Guide to the drafting of
electromagnetic compatibility publications (2014).
The text of this standard is based on the following documents:
FDIS Report on voting
CISPR/B/628/FDIS CISPR/B/631/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website 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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
– 10 – CISPR 11:2015 RLV © IEC 2015
The main content of this standard is based on CISPR Recommendation No. 39/2 given below:
RECOMMENDATION No. 39/2
Limits and methods of measurement of electromagnetic disturbance characteristics
of industrial, scientific and medical (ISM) radio-frequency equipment
The CISPR
CONSIDERING
a) that ISM RF equipment is an important source of disturbance;
b) that methods of measuring such disturbances have been prescribed by the CISPR;
c) that certain frequencies are designated by the International Telecommunication Union
(ITU) for unrestricted radiation from ISM equipment,
RECOMMENDS
that the latest edition of CISPR 11 be used for the application of limits and methods of
measurement of ISM equipment.
INTRODUCTION
This CISPR publication contains, amongst common requirements for the control of RF
disturbances from equipment intended for use in industrial, scientific, and medical (ISM)
electrical applications, specific requirements for the control of RF disturbances caused by ISM
RF applications in the meaning of the definition of the International Telecommunication Union
(ITU), see also Definition 3.13 in this International Standard. CISPR and ITU share their
responsibility for the protection of radio services in respect of the use of ISM RF applications.
The CISPR is concerned with the control of RF disturbances from ISM RF applications by
means of an assessment of these disturbances either at a standardised test site or, for an
individual ISM RF application which cannot be tested at such a site, at its place of operation.
Consequently, this CISPR Publication covers requirements for conformity assessment of both,
equipment assessed by means of type tests at standardised test sites or of individual
equipment under in situ conditions.
The ITU is concerned with the control of RF disturbances from ISM RF applications during
normal operation and use of the respective equipment at its place of operation (see
Definition 1.15 in the ITU Radio Regulations). There, use of radio-frequency energy
decoupled from the ISM RF application by radiation, induction or capacitive coupling is
restricted to the location of that individual application.
This CISPR publication contains, in 6.3, the essential emission requirements for an
assessment of RF disturbances from ISM RF applications at standardised test sites. These
requirements allow for type testing of ISM RF applications operated at frequencies up to
18 GHz. It further contains, in 6.4, the essential emission requirements for an in situ
assessment of RF disturbances from individual ISM RF applications in the frequency range up
to 18 1 GHz. All requirements were established in close collaboration with the ITU and enjoy
approval of the ITU.
However, for operation and use of several types of ISM RF applications the manufacturer,
installer and/or customer should be aware of additional national provisions regarding possible
licensing and particular protection needs of local radio services and applications. Depending
on the country concerned, such additional provisions may apply to individual ISM RF
applications operated at frequencies outsides designated ISM bands (see Table 1). They also
may apply to ISM RF applications operated at frequencies above 18 GHz. For the latter type
of applications, local protection of radio services and appliances requires an accomplishment
of the conformity assessment by application of the relevant national provisions in the
frequency range above 18 GHz in accordance with vested interests of the ITU and national
administrations. These additional national provisions may apply to spurious emissions,
emissions appearing at harmonics of the operation frequency, and to wanted emissions at the
operation frequency allocated outside a designated ISM band in the frequency range above
18 GHz.
Recommendations of CISPR for the protection of radio services in particular areas are found
in Annex E of this International Standard.
Definition 1.15 of the ITU Radio Regulations reads as follows:
1.15 industrial, scientific and medical (ISM) applications (of radio frequency energy):
Operation of equipment or appliances designed to generate and use locally radio frequency
energy for industrial, scientific, medical, domestic or similar purposes, excluding applications
in the field of telecommunications.
[ITU Radio Regulations Volume 1: 2012 – Chapter I, Definition 1.15]
– 12 – CISPR 11:2015 RLV © IEC 2015
INDUSTRIAL, SCIENTIFIC AND MEDICAL EQUIPMENT –
RADIO-FREQUENCY DISTURBANCE CHARACTERISTICS –
LIMITS AND METHODS OF MEASUREMENT
1 Scope
This International Standard applies to industrial, scientific and medical electrical equipment
operating in the frequency range 0 Hz to 400 GHz and to domestic and similar appliances
designed to generate and/or use locally radio-frequency energy.
This standard covers emission requirements related to radio-frequency (RF) disturbances in
the frequency range of 9 kHz to 400 GHz. Measurements need only be performed in
frequency ranges where limits are specified in Clause 6.
For ISM RF applications in the meaning of the definition found in the ITU Radio Regulations
(see Definition 3.13), this standard covers emission requirements related to radio-frequency
disturbances in the frequency range of 9 kHz to 18 GHz.
NOTE Emission requirements for induction cooking appliances are specified in CISPR 14-1 [1] .
Requirements for ISM RF lighting apparatus equipment and UV irradiators operating at
frequencies within the ISM frequency bands defined by the ITU Radio Regulations are
contained in this standard.
Equipment covered by other CISPR product and product family emission standards are
excluded from the scope of this standard.
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.
CISPR 16-1-1:2006 2010, Specification for radio disturbance and immunity measuring
apparatus and methods – Part 1-1: Radio disturbance and immunity measuring apparatus –
Measuring apparatus
CISPR 16-1-1:2010/AMD 1:2006 2010
CISPR 16-1-1:2010/AMD 2:2007 2014
CISPR 16-1-2:2003 2014, Specification for radio disturbance and immunity measuring
apparatus and methods – Part 1-2: Radio disturbance and immunity measuring apparatus –
Ancillary equipment – Conducted disturbances Coupling devices for conducted disturbance
measurements
Amendment 1 (2004)
Amendment 2 (2006)
CISPR 1
...
CISPR 11 ®
Edition 6.0 2015-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
INT ERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
C OMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES
Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
Appareils industriels, scientifiques et médicaux – Caractéristiques de
perturbations radioélectriques – Limites et méthodes de mesure
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 l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
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.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing more than 30 000 terms and
Technical Specifications, Technical Reports and other definitions in English and French, with equivalent terms in 15
documents. Available for PC, Mac OS, Android Tablets and additional languages. Also known as the International
iPad. Electrotechnical Vocabulary (IEV) online.
IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a More than 60 000 electrotechnical terminology entries in
variety of criteria (reference number, text, technical English and French extracted from the Terms and Definitions
committee,…). It also gives information on projects, replaced clause of IEC publications issued since 2002. Some entries
and withdrawn publications. have been collected from earlier publications of IEC TC 37,
77, 86 and CISPR.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: csc@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) 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 IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.
Catalogue IEC - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
Application autonome pour consulter tous les renseignements
Le premier dictionnaire en ligne de termes électroniques et
bibliographiques sur les Normes internationales,
électriques. Il contient plus de 30 000 termes et définitions en
Spécifications techniques, Rapports techniques et autres
anglais et en français, ainsi que les termes équivalents dans
documents de l'IEC. Disponible pour PC, Mac OS, tablettes
15 langues additionnelles. Egalement appelé Vocabulaire
Android et iPad.
Electrotechnique International (IEV) en ligne.
Recherche de publications IEC - www.iec.ch/searchpub
Glossaire IEC - std.iec.ch/glossary
Plus de 60 000 entrées terminologiques électrotechniques, en
La recherche avancée permet de trouver des publications IEC
en utilisant différents critères (numéro de référence, texte, anglais et en français, extraites des articles Termes et
comité d’études,…). Elle donne aussi des informations sur les Définitions des publications IEC parues depuis 2002. Plus
projets et les publications remplacées ou retirées. certaines entrées antérieures extraites des publications des
CE 37, 77, 86 et CISPR de l'IEC.
IEC Just Published - webstore.iec.ch/justpublished
Service Clients - webstore.iec.ch/csc
Restez informé sur les nouvelles publications IEC. Just
Published détaille les nouvelles publications parues. Si vous désirez nous donner des commentaires sur cette
Disponible en ligne et aussi une fois par mois par email. publication ou si vous avez des questions contactez-nous:
csc@iec.ch.
CISPR 11 ®
Edition 6.0 2015-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
INT ERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
C OMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES
Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
Appareils industriels, scientifiques et médicaux – Caractéristiques de
perturbations radioélectriques – Limites et méthodes de mesure
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.100.10 ISBN 978-2-8322-2707-7
– 2 – CISPR 11:2015 © IEC 2015
CONTENTS
FOREWORD . 7
INTRODUCTION . 10
1 Scope . 11
2 Normative references . 11
3 Terms and definitions . 12
4 Frequencies designated for ISM use . 15
5 Classification of equipment . 16
5.1 Separation into groups . 16
5.2 Division into classes . 16
5.3 Documentation for the user . 16
6 Limits of electromagnetic disturbances . 17
6.1 General . 17
6.2 Group 1 equipment measured on a test site . 17
6.2.1 Limits for conducted disturbances . 17
6.2.2 Limits of electromagnetic radiation disturbance. 20
6.3 Group 2 equipment measured on a test site . 21
6.3.1 Limits for conducted disturbances . 21
6.3.2 Limits of electromagnetic radiation disturbance. 22
6.4 Group 1 and group 2 class A equipment measured in situ . 27
6.4.1 Limits for conducted disturbances . 27
6.4.2 Limits of electromagnetic radiation disturbance. 28
7 Measurement requirements . 30
7.1 General . 30
7.2 Ambient noise . 30
7.3 Measuring equipment . 31
7.3.1 Measuring instruments. 31
7.3.2 Artificial network (AN) . 31
7.3.3 Voltage probe . 32
7.3.4 Antennas . 32
7.3.5 Artificial hand . 33
7.4 Frequency measurement . 33
7.5 Configuration of equipment under test. 33
7.5.1 General . 33
7.5.2 Interconnecting cables . 36
7.5.3 Connection to the electricity supply network on a test site . 37
7.6 Load conditions of equipment under test . 39
7.6.1 General . 39
7.6.2 Medical equipment . 40
7.6.3 Industrial equipment . 41
7.6.4 Scientific, laboratory and measuring equipment . 41
7.6.5 Microwave cooking appliances . 42
7.6.6 Other equipment in the frequency range 1 GHz to 18 GHz . 42
7.6.7 Electric welding equipment . 42
7.6.8 ISM RF lighting equipment . 42
7.6.9 Medium voltage (MV) and high voltage (HV) switchgear . 42
7.6.10 Grid connected power converters . 42
7.7 Recording of test-site measurement results . 43
7.7.1 General . 43
7.7.2 Conducted emissions . 43
7.7.3 Radiated emissions . 43
8 Special provisions for test site measurements (9 kHz to 1 GHz) . 44
8.1 Ground planes . 44
8.2 Measurement of conducted disturbances . 44
8.2.1 General . 44
8.2.2 Measurements on grid connected power converters . 45
8.2.3 Handheld equipment which are normally operated without an earth
connection . 49
8.3 Radiation test site for 9 kHz to 1 GHz . 49
8.3.1 General . 49
8.3.2 Validation of the radiation test site (9 kHz to 1 GHz) . 50
8.3.3 Disposition of equipment under test (9 kHz to 1 GHz) . 50
8.3.4 Radiation measurements (9 kHz to 1 GHz) . 51
8.4 Alternative radiation test sites for the frequency range 30 MHz to 1 GHz . 51
9 Radiation measurements: 1 GHz to 18 GHz . 51
9.1 Test arrangement . 51
9.2 Receiving antenna . 51
9.3 Validation and calibration of test site . 51
9.4 Measuring procedure . 52
9.4.1 General . 52
9.4.2 Operating conditions of the EUT . 52
9.4.3 Preliminary measurement . 53
9.4.4 Final measurement . 53
10 Measurement in situ . 55
11 Safety precautions for emission measurements on ISM RF equipment . 55
12 Measurement uncertainty . 55
Annex A (informative) Examples of equipment classification . 56
Annex B (informative) Precautions to be taken in the use of a spectrum analyzer (see
7.3.1) . 58
Annex C (normative) Measurement of electromagnetic radiation disturbance in the
presence of signals from radio transmitters . 59
Annex D (informative) Propagation of interference from industrial radio-frequency
equipment at frequencies between 30 MHz and 300 MHz . 60
Annex E (informative) Recommendations of CISPR for protection of certain radio
services in particular areas . 61
E.1 General . 61
E.2 Recommendations for protection of safety-related radio services . 61
E.3 Recommendations for protection of specific sensitive radio services . 61
Annex F (informative) Frequency bands allocated for safety-related radio services . 62
Annex G (informative) Frequency bands allocated for sensitive radio services . 63
Annex H (informative) Statistical assessment of series produced equipment against
the requirements of CISPR standards . 65
H.1 Significance of a CISPR limit . 65
H.2 Type tests . 65
– 4 – CISPR 11:2015 © IEC 2015
H.3 Statistical assessment of series produced equipment . 65
H.3.1 Assessment based on a general margin to the limit . 65
H.3.2 Assessment based on the non-central t-distribution . 66
H.3.3 Assessment based on the binomial distribution . 68
H.3.4 Equipment produced on an individual basis . 68
Annex I (normative) Artificial Network (AN) for the assessment of disturbance
voltages at d.c. power ports of semiconductor power converters . 69
I.1 General information and purpose . 69
I.2 Structures for a DC-AN . 69
I.2.1 AN suitable for measurement of unsymmetrical mode (UM) disturbances . 69
I.2.2 AN suitable for measurement of common mode (CM) and differential
mode (DM) disturbances . 69
I.2.3 AN suitable for measurement of UM, CM and DM disturbances . 70
I.3 Employment of DC-ANs for compliance measurements . 70
I.3.1 General . 70
I.3.2 Pseudo V-AN . 70
I.3.3 Delta-AN . 70
I.4 Normative technical requirements for the DC-AN . 71
I.4.1 Parameters and associated tolerances in the range 150 kHz to 30 MHz . 71
I.4.2 Parameters and associated tolerances in the range 9 kHz to 150 kHz . 72
I.5 Examples of practical implementations of DC-ANs . 72
Annex J (informative) Measurements on Grid Connected Power Converters (GCPC) –
Setups for an effective test site configuration . 75
J.1 General information and purpose . 75
J.2 Setup of the test site . 75
J.2.1 Block diagram of test site . 75
J.2.2 DC power supply . 76
J.2.3 AC power source . 76
J.2.4 Other components . 77
J.3 Other test setups . 77
J.3.1 Configuration comprising laboratory AC power source and resistive load . 77
J.3.2 Configuration in case of reverse power flow to the AC mains . 78
Annex K (informative) Test site configuration and instrumentation – Guidance on
prevention of saturation effects in mitigation filters of transformer-less power
converters during type tests according to this standard. 80
K.1 General information and purpose . 80
K.2 Recommendations for avoidance of saturation effects in the range 9 kHz to
150 kHz . 81
K.3 Detailed advice . 81
K.3.1 General . 81
K.3.2 Insert of series inductors (or common mode chokes) in the laboratory's
d.c. power supply chain . 82
K.3.3 Employment of additional common mode decoupling capacitors at the
interface between the AE port of the DC-AN and the laboratory d.c.
power supply port allocated in the test environment . 83
K.4 Background information . 84
Bibliography . 86
Figure 1 – Circuit for disturbance voltage measurements on mains supply . 32
Figure 2 – Artificial hand, RC element . 33
Figure 3 – Example for a typical cable arrangement for measurements of radiated
disturbances in 3 m separation distance, Table-top EUT . 35
Figure 4 – Example for a typical test set up for measurement of conducted and/or
radiated disturbances from a floor standing EUT, 3D view . 36
Figure 5 – Disposition of medical (capacitive type) and dummy load . 40
Figure 6 – Typical arrangement for measurement of conducted disturbances at LV d.c.
power ports with the DC-AN used as termination and decoupling unit to the laboratory
d.c. power source . 46
Figure 7 – Typical arrangement for measurement of conducted disturbances at LV d.c.
power ports with the DC-AN used as termination and voltage probe . 47
Figure 8 – Typical arrangement for measurement of conducted disturbances at LV d.c.
power ports with the DC-AN used as voltage probe and with a current probe – 2D
diagram . 48
Figure 9 – Typical arrangement for measurement of conducted disturbances at LV d.c.
power ports with a DC-AN used as voltage probe and with a current probe – 3D
diagram . 48
Figure 10 – Test site . 50
Figure 11 – Minimum size of metal ground plane . 50
Figure 12 – Decision tree for the measurement of emissions from 1 GHz to 18 GHz of
group 2 equipment operating at frequencies above 400 MHz . 52
Figure H.1 – An example of possible difficulties . 68
Figure I.1 – Practical implementation of a 150 Ω DC-AN suitable for measurement of
UM disturbances (Example) . 72
Figure I.2 – Practical implementation of a 150 Ω DC-AN suitable for measurement of
CM and DM disturbances (Example, see also Figure A.2 in CISPR 16-1-2:2014) . 73
Figure I.3 – Practical implementation of a 150 Ω DC-AN suitable for measurement of
UM, or CM and DM disturbances (Example 1) . 73
Figure I.4 – Practical implementation of a 150 Ω DC-AN suitable for measurement of
UM, or CM and DM disturbances (Example 2) . 74
Figure I.5 – Practical implementation of a 150 Ω DC-AN suitable for measurement of
UM, or CM and DM disturbances (Example 3) . 74
Figure J.1 – Setup of the test site (Case 1) – 2D diagram . 75
Figure J.2 – Setup of the test site (Case 1) – 3D diagram . 76
Figure J.3 – Setup of the test site (Case 2) – 2D diagram . 77
Figure J.4 – Setup of the test site (Case 2) – 3D diagram . 78
Figure J.5 – Setup of the test site (Case 3) – 2D diagram . 79
Figure J.6 – Setup of the test site (Case 3) – 3D diagram . 79
Figure K.1 – Flow of the common mode RF current at test site configuration level . 82
Figure K.2 – Blocking of flow of common mode RF current by insert of series inductors . 83
Figure K.3 – Blocking of flow of common mode RF current by employment of
additional CM decoupling capacitors . 83
Figure K.4 – CM termination impedance at the EUT port of a DC-AN – Magnitude-
versus-frequency characteristic in the range 3 kHz to 30 MHz, Example . 84
Figure K.5 – Prevention of saturation of mitigation filters by use of additional
decoupling capacitors . 85
Figure K.6 – Change in the resonant frequency caused by the increase and decrease
in the decoupling capacitor's capacitance . 85
Figure K.7 – DC-AN circuit example where capacitance of blocking capacitors of the
LC decoupling circuit can be increased or decreased . 85
– 6 – CISPR 11:2015 © IEC 2015
Table 1 – Frequencies in the radio-frequency (RF) range designated by ITU for use as
fundamental ISM frequencies . 15
Table 2 – Disturbance voltage limits for class A group 1 equipment measured on a test
site (a.c. mains power port) . 18
Table 3 – Limits for conducted disturbances of class A group 1 equipment measured
on a test site (d.c. power port) . 19
Table 4 – Disturbance voltage limits for class B group 1 equipment measured on a test
site (a.c. mains power port) . 19
Table 5 – Disturbance voltage limits for class B group 1 equipment measured on a test
site (d.c. power port) . 19
Table 6 – Electromagnetic radiation disturbance limits for class A group 1 equipment
measured on a test site . 20
Table 7 – Electromagnetic radiation disturbance limits for class B group 1 equipment
measured on a test site . 21
Table 8 – Disturbance voltage limits for class A group 2 equipment measured on a test
site (a.c. mains power port) . 22
Table 9 – Disturbance voltage limits for class B group 2 equipment measured on a test
site (a.c. mains power port) . 22
Table 10 – Electromagnetic radiation disturbance limits for class A group 2 equipment
measured on a test site . 24
Table 11 – Electromagnetic radiation disturbance limits for class A EDM and arc
welding equipment measured on a test site . 25
Table 12 – Electromagnetic radiation disturbance limits for class B group 2 equipment
measured on a test site . 25
Table 13 – Electromagnetic radiation disturbance peak limits for group 2 equipment
operating at frequencies above 400 MHz . 26
Table 14 – Electromagnetic radiation disturbance weighted limits for group 2
equipment operating at frequencies above 400 MHz . 27
–1
Table 15 – Electromagnetic radiation disturbance APD level corresponding to 10
limits for class B group 2 equipment operating at frequencies above 400 MHz . 27
Table 16 – Electromagnetic radiation disturbance limits for class A group 1 equipment
measured in situ . 28
Table 17 – Electromagnetic radiation disturbance limits for class A group 2 equipment
measured in situ . 29
Table 18 – Frequency sub-ranges to be used for weighted measurements . 54
Table E.1 – Limits for electromagnetic radiation disturbances for in situ measurements
to protect specific safety-related radio services in particular areas . 61
Table H.1 – General margin to the limit for statistical evaluation . 65
Table H.2 – The non-central t-distribution factor k as a function of the sample size n . 67
Table H.3 – Application of the binomial distribution . 68
Table I.1 – Parameters and associated tolerances in the range 150 kHz to 30 MHz . 71
Table I.2 – Parameters and associated tolerances in the range 9 kHz to 150 kHz . 72
INTERNATIONAL ELECTROTECHNICAL COMMISSION
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
_____________
INDUSTRIAL, SCIENTIFIC AND MEDICAL EQUIPMENT –
RADIO-FREQUENCY DISTURBANCE CHARACTERISTICS –
LIMITS AND METHODS OF MEASUREMENT
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC 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 CISPR 11 has been prepared by CISPR Subcommittee B: Interference
relating to industrial, scientific and medical radio-frequency apparatus, to other (heavy)
industrial equipment, to overhead power lines, to high voltage equipment and to electric
traction.
This sixth edition cancels and replaces the fifth edition published in 2009 and its
Amendment 1 published in 2010. It constitutes a technical revision.
It introduces and permits type testing on components of power electronic equipment, systems
and installations. Its emission limits apply now to low voltage (LV) a.c. and d.c. power ports,
irrespective of the direction of power transmission. Several limits were adapted to the
practical test conditions found at test sites. They are also applicable now to power electronic
ISM RF equipment used for wireless power transfer (WPT), for instant power supply and
charging purposes. The limits in the range 1 GHz to 18 GHz apply now to CW-type
disturbances and to fluctuating disturbances in a similar, uniform and technology-neutral way.
– 8 – CISPR 11:2015 © IEC 2015
For these measurements, two alternative methods of measurement are available, the
traditional log-AV method and the new APD method.
For measurements at LV d.c. power ports of power electronic equipment, a modern
implementation of the 150 Ω Delta-network specified in CISPR 16-1-2 has been made
available.
This International Standard CISPR 11 has the status of a Product Family EMC standard in
accordance with IEC Guide 107, Electromagnetic compatibility – Guide to the drafting of
electromagnetic compatibility publications (2014).
The text of this standard is based on the following documents:
FDIS Report on voting
CISPR/B/628/FDIS CISPR/B/631/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website 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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
The main content of this standard is based on CISPR Recommendation No. 39/2 given below:
RECOMMENDATION No. 39/2
Limits and methods of measurement of electromagnetic disturbance characteristics
of industrial, scientific and medical (ISM) radio-frequency equipment
The CISPR
CONSIDERING
a) that ISM RF equipment is an important source of disturbance;
b) that methods of measuring such disturbances have been prescribed by the CISPR;
c) that certain frequencies are designated by the International Telecommunication Union
(ITU) for unrestricted radiation from ISM equipment,
RECOMMENDS
that the latest edition of CISPR 11 be used for the application of limits and methods of
measurement of ISM equipment.
– 10 – CISPR 11:2015 © IEC 2015
INTRODUCTION
This CISPR publication contains, amongst common requirements for the control of RF
disturbances from equipment intended for use in industrial, scientific, and medical electrical
applications, specific requirements for the control of RF disturbances caused by ISM RF
applications in the meaning of the definition of the International Telecommunication Union
(ITU), see also Definition 3.13 in this International Standard. CISPR and ITU share their
responsibility for the protection of radio services in respect of the use of ISM RF applications.
The CISPR is concerned with the control of RF disturbances from ISM RF applications by
means of an assessment of these disturbances either at a standardised test site or, for an
individual ISM RF application which cannot be tested at such a site, at its place of operation.
Consequently, this CISPR Publication covers requirements for conformity assessment of both,
equipment assessed by means of type tests at standardised test sites or of individual
equipment under in situ conditions.
The ITU is concerned with the control of RF disturbances from ISM RF applications during
normal operation and use of the respective equipment at its place of operation (see
Definition 1.15 in the ITU Radio Regulations). There, use of radio-frequency energy
decoupled from the ISM RF application by radiation, induction or capacitive coupling is
restricted to the location of that individual application.
This CISPR publication contains, in 6.3, the essential emission requirements for an
assessment of RF disturbances from ISM RF applications at standardised test sites. These
requirements allow for type testing of ISM RF applications operated at frequencies up to
18 GHz. It further contains, in 6.4, the essential emission requirements for an in situ
assessment of RF disturbances from individual ISM RF applications in the frequency range up
to 1 GHz. All requirements were established in close collaboration with the ITU and enjoy
approval of the ITU.
However, for operation and use of several types of ISM RF applications the manufacturer,
installer and/or customer should be aware of additional national provisions regarding possible
licensing and particular protection needs of local radio services and applications. Depending
on the country concerned, such additional provisions may apply to individual ISM RF
applications operated at frequencies outsides designated ISM bands (see Table 1). They also
may apply to ISM RF applications operated at frequencies above 18 GHz. For the latter type
of applications, local protection of radio services and appliances requires an accomplishment
of the conformity assessment by application of the relevant national provisions in the
frequency range above 18 GHz in accordance with vested interests of the ITU and national
administrations. These additional national provisions may apply to spurious emissions,
emissions appearing at harmonics of the operation frequency, and to wanted emissions at the
operation frequency allocated outside a designated ISM band in the frequency range above
18 GHz.
Recommendations of CISPR for the protection of radio services in particular areas are found
in Annex E of this International Standard.
Definition 1.15 of the ITU Radio Regulations reads as follows:
1.15 industrial, scientific and medical (ISM) applications (of radio frequency energy):
Operation of equipment or appliances designed to generate and use locally radio frequency
energy for industrial, scientific, medical, domestic or similar purposes, excluding applications
in the field of telecommunications.
[ITU Radio Regulations Volume 1: 2012 – Chapter I, Definition 1.15]
INDUSTRIAL, SCIENTIFIC AND MEDICAL EQUIPMENT –
RADIO-FREQUENCY DISTURBANCE CHARACTERISTICS –
LIMITS AND METHODS OF MEASUREMENT
1 Scope
This International Standard applies to industrial, scientific and medical electrical equipment
operating in the frequency range 0 Hz to 400 GHz and to domestic and similar appliances
designed to generate and/or use locally radio-frequency energy.
This standard covers emission requirements related to radio-frequency (RF) disturbances in
the frequency range of 9 kHz to 400 GHz. Measurements need only be performed in
frequency ranges where limits are specified in Clause 6.
For ISM RF applications in the meaning of the definition found in the ITU Radio Regulations
(see Definition 3.13), this standard covers emission requirements related to radio-frequency
disturbances in the frequency range of 9 kHz to 18 GHz.
NOTE Emission requirements for induction cooking appliances are specified in CISPR 14-1 [1] .
Requirements for ISM RF lighting equipment and UV irradiators operating at frequencies
within the ISM frequency bands defined by the ITU Radio Regulations are contained in this
standard.
Equipment covered by other CISP
...
CISPR 11 ®
Edition 6.1 2016-06
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
COMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES
Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
Appareils industriels, scientifiques et médicaux – Caractéristiques de
perturbations radioélectriques – Limites et méthodes de mesure
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 l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
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.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 15 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.
IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: csc@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) 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 IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.
Catalogue IEC - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
Application autonome pour consulter tous les renseignements
Le premier dictionnaire en ligne de termes électroniques et
bibliographiques sur les Normes internationales,
électriques. Il contient 20 000 termes et définitions en anglais
Spécifications techniques, Rapports techniques et autres
et en français, ainsi que les termes équivalents dans 15
documents de l'IEC. Disponible pour PC, Mac OS, tablettes
langues additionnelles. Egalement appelé Vocabulaire
Android et iPad.
Electrotechnique International (IEV) en ligne.
Recherche de publications IEC - www.iec.ch/searchpub
Glossaire IEC - std.iec.ch/glossary
La recherche avancée permet de trouver des publications IEC
65 000 entrées terminologiques électrotechniques, en anglais
en utilisant différents critères (numéro de référence, texte,
et en français, extraites des articles Termes et Définitions des
comité d’études,…). Elle donne aussi des informations sur les
publications IEC parues depuis 2002. Plus certaines entrées
projets et les publications remplacées ou retirées.
antérieures extraites des publications des CE 37, 77, 86 et
CISPR de l'IEC.
IEC Just Published - webstore.iec.ch/justpublished
Restez informé sur les nouvelles publications IEC. Just Service Clients - webstore.iec.ch/csc
Published détaille les nouvelles publications parues. Si vous désirez nous donner des commentaires sur cette
Disponible en ligne et aussi une fois par mois par email. publication ou si vous avez des questions contactez-nous:
csc@iec.ch.
CISPR 11 ®
Edition 6.1 2016-06
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
COMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES
Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
Appareils industriels, scientifiques et médicaux – Caractéristiques de
perturbations radioélectriques – Limites et méthodes de mesure
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.100.10 ISBN 978-2-8322-3483-9
CISPR 11 ®
Edition 6.1 2016-06
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
COMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES
Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
Appareils industriels, scientifiques et médicaux – Caractéristiques de
perturbations radioélectriques – Limites et méthodes de mesure
– 2 – CISPR 11:2015+AMD1:2016 CSV
© IEC 2016
CONTENTS
FOREWORD . 7
INTRODUCTION . 10
Introduction to Amendment 1 . 11
1 Scope . 12
2 Normative references. 12
3 Terms and definitions . 13
4 Frequencies designated for ISM use . 16
5 Classification of equipment . 17
5.1 Separation into groups . 17
5.2 Division into classes . 17
5.3 Documentation for the user . 18
6 Limits of electromagnetic disturbances . 18
6.1 General . 18
6.2 Group 1 equipment measured on a test site . 19
6.2.1 Limits for conducted disturbances . 19
6.2.2 Limits of electromagnetic radiation disturbance . 22
6.3 Group 2 equipment measured on a test site . 23
6.3.1 Limits for conducted disturbances . 23
6.3.2 Limits of electromagnetic radiation disturbance . 25
6.4 Group 1 and group 2 class A equipment measured in situ . 30
6.4.1 Limits for conducted disturbances . 30
6.4.2 Limits of electromagnetic radiation disturbance . 31
7 Measurement requirements . 33
7.1 General . 33
7.2 Ambient noise . 33
7.3 Measuring equipment . 34
7.3.1 Measuring instruments . 34
7.3.2 Artificial network (AN) . 34
7.3.3 Voltage probe . 35
7.3.4 Antennas . 35
7.3.5 Artificial hand . 36
7.4 Frequency measurement . 37
7.5 Configuration of equipment under test . 37
7.5.1 General . 37
7.5.2 Interconnecting cables . 41
7.5.3 Connection to the electricity supply network on a test site . 42
7.6 Load conditions of equipment under test . 44
7.6.1 General . 44
7.6.2 Medical equipment . 44
7.6.3 Industrial equipment . 46
7.6.4 Scientific, laboratory and measuring equipment . 46
7.6.5 Microwave cooking appliances . 46
7.6.6 Other equipment in the frequency range 1 GHz to 18 GHz . 46
7.6.7 Electric welding equipment . 47
7.6.8 ISM RF lighting equipment . 47
© IEC 2016
7.6.9 Medium voltage (MV) and high voltage (HV) switchgear . 47
7.6.10 Grid connected power converters . 47
7.7 Recording of test-site measurement results . 48
7.7.1 General . 48
7.7.2 Conducted emissions . 48
7.7.3 Radiated emissions . 48
8 Special provisions for test site measurements (9 kHz to 1 GHz) . 48
8.1 Ground planes . 48
8.2 Measurement of conducted disturbances . 49
8.2.1 General . 49
8.2.2 Measurements on grid connected power converters . 49
8.2.3 Handheld equipment which are normally operated without an earth
connection . 54
8.3 Radiation test site for OATS and SAC for measurements in the range 9 kHz
to 1 GHz . 54
8.3.1 General . 54
8.3.2 Validation of the radiation test site (9 kHz to 1 GHz) . 55
8.3.3 Disposition of equipment under test (9 kHz to 1 GHz) . 55
8.3.4 Radiation measurements (9 kHz to 1 GHz) . 56
8.4 Alternative radiation test sites for the frequency range 30 MHz to 1 GHz . 56
8.5 FAR for measurements in the range 30 MHz to 1 GHz . 56
9 Radiation measurements: 1 GHz to 18 GHz . 57
9.1 Test arrangement . 57
9.2 Receiving antenna . 57
9.3 Validation and calibration of test site . 57
9.4 Measuring procedure . 57
9.4.1 General . 57
9.4.2 Operating conditions of the EUT . 58
9.4.3 Preliminary measurement . 58
9.4.4 Final measurement . 59
10 Measurement in situ . 60
11 Safety precautions for emission measurements on ISM RF equipment . 61
12 Measurement uncertainty . 61
Annex A (informative) Examples of equipment classification . 62
Annex B (informative) Precautions to be taken in the use of a spectrum analyzer (see
7.3.1) . 64
Annex C (normative) Measurement of electromagnetic radiation disturbance in the
presence of signals from radio transmitters . 65
Annex D (informative) Propagation of interference from industrial radio-frequency
equipment at frequencies between 30 MHz and 300 MHz . 66
Annex E (informative) Recommendations of CISPR for protection of certain radio
services in particular areas . 67
E.1 General . 67
E.2 Recommendations for protection of safety-related radio services . 67
E.3 Recommendations for protection of specific sensitive radio services . 67
Annex F (informative) Frequency bands allocated for safety-related radio services . 68
Annex G (informative) Frequency bands allocated for sensitive radio services . 69
Annex H (informative) Statistical assessment of series produced equipment against
the requirements of CISPR standards . 71
– 4 – CISPR 11:2015+AMD1:2016 CSV
© IEC 2016
H.1 Significance of a CISPR limit . 71
H.2 Type tests . 71
H.3 Statistical assessment of series produced equipment . 71
H.3.1 Assessment based on a general margin to the limit . 71
H.3.2 Assessment based on the non-central t-distribution . 72
H.3.3 Assessment based on the binomial distribution . 74
H.3.4 Equipment produced on an individual basis . 75
Annex I (normative) Artificial Network (AN) for the assessment of disturbance
voltages at d.c. power ports of semiconductor power converters . 76
I.1 General information and purpose . 76
I.2 Structures for a DC-AN . 76
I.2.1 AN suitable for measurement of unsymmetrical mode (UM) disturbances . 76
I.2.2 AN suitable for measurement of common mode (CM) and differential
mode (DM) disturbances . 76
I.2.3 AN suitable for measurement of UM, CM and DM disturbances . 77
I.3 Employment of DC-ANs for compliance measurements . 77
I.3.1 General . 77
I.3.2 Pseudo V-AN . 77
I.3.3 Delta-AN . 77
I.4 Normative technical requirements for the DC-AN . 78
I.4.1 Parameters and associated tolerances in the range 150 kHz to 30 MHz . 78
I.4.2 Parameters and associated tolerances in the range 9 kHz to 150 kHz . 79
I.5 Examples of practical implementations of DC-ANs . 79
Annex J (informative) Measurements on Grid Connected Power Converters (GCPC) –
Setups for an effective test site configuration . 82
J.1 General information and purpose . 82
J.2 Setup of the test site . 82
J.2.1 Block diagram of test site . 82
J.2.2 DC power supply . 83
J.2.3 AC power source . 83
J.2.4 Other components . 84
J.3 Other test setups . 84
J.3.1 Configuration comprising laboratory AC power source and resistive load . 84
J.3.2 Configuration in case of reverse power flow to the AC mains . 85
Annex K (informative) Test site configuration and instrumentation – Guidance on
prevention of saturation effects in mitigation filters of transformer-less power
converters during type tests according to this standard . 87
K.1 General information and purpose . 87
K.2 Recommendations for avoidance of saturation effects in the range 9 kHz to
150 kHz . 88
K.3 Detailed advice . 88
K.3.1 General . 88
K.3.2 Insert of series inductors (or common mode chokes) in the laboratory's
d.c. power supply chain . 89
K.3.3 Employment of additional common mode decoupling capacitors at the
interface between the AE port of the DC-AN and the laboratory d.c.
power supply port allocated in the test environment . 90
K.4 Background information . 91
Bibliography . 93
© IEC 2016
Figure 1 – Circuit for disturbance voltage measurements on mains supply . 35
Figure 2 – Artificial hand, RC element . 37
Figure 3 – Example for a typical cable arrangement for measurements of radiated
disturbances in 3 m separation distance, Table-top EUT . 39
Figure 4 – Example for a typical test set up for measurement of conducted and/or
radiated disturbances from a floor standing EUT, 3D view . 40
Figure 5 – Disposition of medical (capacitive type) and dummy load . 45
Figure 6 – Typical arrangement for measurement of conducted disturbances at LV d.c.
power ports with the DC-AN used as termination and decoupling unit to the laboratory
d.c. power source . 51
Figure 7 – Typical arrangement for measurement of conducted disturbances at LV d.c.
power ports with the DC-AN used as termination and voltage probe . 52
Figure 8 – Typical arrangement for measurement of conducted disturbances at LV d.c.
power ports with the DC-AN used as voltage probe and with a current probe – 2D
diagram . 53
Figure 9 – Typical arrangement for measurement of conducted disturbances at LV d.c.
power ports with a DC-AN used as voltage probe and with a current probe – 3D
diagram . 53
Figure 10 – Test site . 55
Figure 11 – Minimum size of metal ground plane . 55
Figure 12 – Decision tree for the measurement of emissions from 1 GHz to 18 GHz of
group 2 equipment operating at frequencies above 400 MHz . 58
Figure H.1 – An example of possible difficulties . 74
Figure I.1 – Practical implementation of a 150 Ω DC-AN suitable for measurement of
UM disturbances (Example) . 79
Figure I.2 – Practical implementation of a 150 Ω DC-AN suitable for measurement of
CM and DM disturbances (Example, see also Figure A.2 in CISPR 16-1-2:2014) . 80
Figure I.3 – Practical implementation of a 150 Ω DC-AN suitable for measurement of
UM, or CM and DM disturbances (Example 1) . 80
Figure I.4 – Practical implementation of a 150 Ω DC-AN suitable for measurement of
UM, or CM and DM disturbances (Example 2) . 81
Figure I.5 – Practical implementation of a 150 Ω DC-AN suitable for measurement of
UM, or CM and DM disturbances (Example 3) . 81
Figure J.1 – Setup of the test site (Case 1) – 2D diagram . 82
Figure J.2 – Setup of the test site (Case 1) – 3D diagram . 83
Figure J.3 – Setup of the test site (Case 2) – 2D diagram . 84
Figure J.4 – Setup of the test site (Case 2) – 3D diagram . 85
Figure J.5 – Setup of the test site (Case 3) – 2D diagram . 86
Figure J.6 – Setup of the test site (Case 3) – 3D diagram . 86
Figure K.1 – Flow of the common mode RF current at test site configuration level . 89
Figure K.2 – Blocking of flow of common mode RF current by insert of series inductors . 90
Figure K.3 – Blocking of flow of common mode RF current by employment of
additional CM decoupling capacitors . 90
Figure K.4 – CM termination impedance at the EUT port of a DC-AN – Magnitude-
versus-frequency characteristic in the range 3 kHz to 30 MHz, Example . 91
Figure K.5 – Prevention of saturation of mitigation filters by use of additional
decoupling capacitors . 92
Figure K.6 – Change in the resonant frequency caused by the increase and decrease
in the decoupling capacitor's capacitance . 92
– 6 – CISPR 11:2015+AMD1:2016 CSV
© IEC 2016
Figure K.7 – DC-AN circuit example where capacitance of blocking capacitors of the
LC decoupling circuit can be increased or decreased . 92
Table 1 – Frequencies in the radio-frequency (RF) range designated by ITU for use as
fundamental ISM frequencies . 17
Table 2 – Disturbance voltage limits for class A group 1 equipment measured on a test
site (a.c. mains power port) . 20
Table 3 – Limits for conducted disturbances of class A group 1 equipment measured
on a test site (d.c. power port) . 21
Table 4 – Disturbance voltage limits for class B group 1 equipment measured on a test
site (a.c. mains power port) . 21
Table 5 – Disturbance voltage limits for class B group 1 equipment measured on a test
site (d.c. power port) . 21
Table 6 – Electromagnetic radiation disturbance limits for class A group 1 equipment
measured on a test site . 22
Table 7 – Electromagnetic radiation disturbance limits for class B group 1 equipment
measured on a test site . 23
Table 8 – Disturbance voltage limits for class A group 2 equipment measured on a test
site (a.c. mains power port) . 24
Table 9 – Disturbance voltage limits for class B group 2 equipment measured on a test
site (a.c. mains power port) . 25
Table 10 – Electromagnetic radiation disturbance limits for class A group 2 equipment
measured on a test site . 27
Table 11 – Electromagnetic radiation disturbance limits for class A EDM and arc
welding equipment measured on a test site . 28
Table 12 – Electromagnetic radiation disturbance limits for class B group 2 equipment
measured on a test site . 28
Table 13 – Electromagnetic radiation disturbance peak limits for group 2 equipment
operating at frequencies above 400 MHz . 29
Table 14 – Electromagnetic radiation disturbance weighted limits for group 2
equipment operating at frequencies above 400 MHz . 30
–1
Table 15 – Electromagnetic radiation disturbance APD level corresponding to 10
limits for class B group 2 equipment operating at frequencies above 400 MHz . 30
Table 16 – Electromagnetic radiation disturbance limits for class A group 1 equipment
measured in situ . 31
Table 17 – Electromagnetic radiation disturbance limits for class A group 2 equipment
measured in situ . 32
Table 18 – Frequency sub-ranges to be used for weighted measurements . 60
Table E.1 – Limits for electromagnetic radiation disturbances for in situ measurements
to protect specific safety-related radio services in particular areas . 67
Table H.1 – General margin to the limit for statistical evaluation . 72
Table H.2 – The non-central t-distribution factor k as a function of the sample size n . 73
Table H.3 – Application of the binomial distribution . 75
Table I.1 – Parameters and associated tolerances in the range 150 kHz to 30 MHz . 78
Table I.2 – Parameters and associated tolerances in the range 9 kHz to 150 kHz . 79
© IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
_____________
INDUSTRIAL, SCIENTIFIC AND MEDICAL EQUIPMENT –
RADIO-FREQUENCY DISTURBANCE CHARACTERISTICS –
LIMITS AND METHODS OF MEASUREMENT
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC 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.
This consolidated version of the official IEC Standard and its amendment has been
prepared for user convenience.
CISPR 11 edition 6.1 contains the sixth edition (2015-06) [documents CISPR/B/628/FDIS
and CISPR/B/631/RVD] and its amendment 1 (2016-06) [documents CISPR/B/627/CDV and
CISPR/B/639A/RVC].
In this Redline version, a vertical line in the margin shows where the technical content is
modified by amendment 1. Additions are in green text, deletions are in strikethrough red
text. A separate Final version with all changes accepted is available in this publication.
– 8 – CISPR 11:2015+AMD1:2016 CSV
© IEC 2016
International Standard CISPR 11 has been prepared by CISPR Subcommittee B: Interference
relating to industrial, scientific and medical radio-frequency apparatus, to other (heavy)
industrial equipment, to overhead power lines, to high voltage equipment and to electric
traction.
This sixth edition introduces and permits type testing on components of power electronic
equipment, systems and installations. Its emission limits apply now to low voltage (LV) a.c.
and d.c. power ports, irrespective of the direction of power transmission. Several limits were
adapted to the practical test conditions found at test sites. They are also applicable now to
power electronic ISM RF equipment used for wireless power transfer (WPT), for instant power
supply and charging purposes. The limits in the range 1 GHz to 18 GHz apply now to CW-type
disturbances and to fluctuating disturbances in a similar, uniform and technology-neutral way.
For these measurements, two alternative methods of measurement are available, the
traditional log-AV method and the new APD method.
For measurements at LV d.c. power ports of power electronic equipment, a modern
implementation of the 150 Ω Delta-network specified in CISPR 16-1-2 has been made
available.
This International Standard CISPR 11 has the status of a Product Family EMC standard in
accordance with IEC Guide 107, Electromagnetic compatibility – Guide to the drafting of
electromagnetic compatibility publications (2014).
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of the base publication and its amendment 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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
© IEC 2016
The main content of this standard is based on CISPR Recommendation No. 39/2 given below:
RECOMMENDATION No. 39/2
Limits and methods of measurement of electromagnetic disturbance characteristics
of industrial, scientific and medical (ISM) radio-frequency equipment
The CISPR
CONSIDERING
a) that ISM RF equipment is an important source of disturbance;
b) that methods of measuring such disturbances have been prescribed by the CISPR;
c) that certain frequencies are designated by the International Telecommunication Union
(ITU) for unrestricted radiation from ISM equipment,
RECOMMENDS
that the latest edition of CISPR 11 be used for the application of limits and methods of
measurement of ISM equipment.
– 10 – CISPR 11:2015+AMD1:2016 CSV
© IEC 2016
INTRODUCTION
This CISPR publication contains, amongst common requirements for the control of RF
disturbances from equipment intended for use in industrial, scientific, and medical electrical
applications, specific requirements for the control of RF disturbances caused by ISM RF
applications in the meaning of the definition of the International Telecommunication Union
(ITU), see also Definition 3.13 in this International Standard. CISPR and ITU share their
responsibility for the protection of radio services in respect of the use of ISM RF applications.
The CISPR is concerned with the control of RF disturbances from ISM RF applications by
means of an assessment of these disturbances either at a standardised test site or, for an
individual ISM RF application which cannot be tested at such a site, at its place of operation.
Consequently, this CISPR Publication covers requirements for conformity assessment of both,
equipment assessed by means of type tests at standardised test sites or of individual
equipment under in situ conditions.
The ITU is concerned with the control of RF disturbances from ISM RF applications during
normal operation and use of the respective equipment at its place of operation (see
Definition 1.15 in the ITU Radio Regulations). There, use of radio-frequency energy
decoupled from the ISM RF application by radiation, induction or capacitive coupling is
restricted to the location of that individual application.
This CISPR publication contains, in 6.3, the essential emission requirements for an
assessment of RF disturbances from ISM RF applications at standardised test sites. These
requirements allow for type testing of ISM RF applications operated at frequencies up to
18 GHz. It further contains, in 6.4, the essential emission requirements for an in situ
assessment of RF disturbances from individual ISM RF applications in the frequency range up
to 1 GHz. All requirements were established in close collaboration with the ITU and enjoy
approval of the ITU.
However, for operation and use of several types of ISM RF applications the manufacturer,
installer and/or customer should be aware of additional national provisions regarding possible
licensing and particular protection needs of local radio services and applications. Depending
on the country concerned, such additional provisions may apply to individual ISM RF
applications operated at frequencies outsides designated ISM bands (see Table 1). They also
may apply to ISM RF applications operated at frequencies above 18 GHz. For the latter type
of applications, local protection of radio services and appliances requires an accomplishment
of the conformity assessment by application of the relevant national provisions in the
frequency range above 18 GHz in accordance with vested interests of the ITU and national
administrations. These additional national provisions may apply to spurious emissions,
emissions appearing at harmonics of the operation frequency, and to wanted emissions at the
operation frequency allocated outside a designated ISM band in the frequency range above
18 GHz.
Recommendations of CISPR for the protection of radio services in particular areas are found
in Annex E of this International Standard.
Definition 1.15 of the ITU Radio Regulations reads as follows:
1.15 industrial, scientific and medical (ISM) applications (of radio frequency energy):
Operation of equipment or appliances designed to generate and use locally radio frequency
energy for industrial, scientific, medical, domestic or similar purpos
...
CISPR 11 ®
Edition 6.2 2019-01
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
COMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES
Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
Appareils industriels, scientifiques et médicaux – Caractéristiques de
perturbations radioélectriques – Limites et méthodes de mesure
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 l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
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 corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and definitions clause of
IEC publications issued between 2002 and 2015. Some
IEC Customer Service Centre - webstore.iec.ch/csc entries have been collected from earlier publications of IEC
If you wish to give us your feedback on this publication or TC 37, 77, 86 and CISPR.
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) 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 IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.
Recherche de publications IEC - Electropedia - www.electropedia.org
webstore.iec.ch/advsearchform Le premier dictionnaire d'électrotechnologie en ligne au
La recherche avancée permet de trouver des publications IEC monde, avec plus de 22 000 articles terminologiques en
en utilisant différents critères (numéro de référence, texte, anglais et en français, ainsi que les termes équivalents dans
comité d’études,…). Elle donne aussi des informations sur les 16 langues additionnelles. Egalement appelé Vocabulaire
projets et les publications remplacées ou retirées. Electrotechnique International (IEV) en ligne.
IEC Just Published - webstore.iec.ch/justpublished Glossaire IEC - std.iec.ch/glossary
Restez informé sur les nouvelles publications IEC. Just 67 000 entrées terminologiques électrotechniques, en anglais
Published détaille les nouvelles publications parues. et en français, extraites des articles Termes et définitions des
Disponible en ligne et une fois par mois par email. publications IEC parues entre 2002 et 2015. Plus certaines
entrées antérieures extraites des publications des CE 37, 77,
Service Clients - webstore.iec.ch/csc 86 et CISPR de l'IEC.
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
sales@iec.ch.
CISPR 11 ®
Edition 6.2 2019-01
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
COMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES
Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
Appareils industriels, scientifiques et médicaux – Caractéristiques de
perturbations radioélectriques – Limites et méthodes de mesure
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.100.10 ISBN 978-2-8322-6461-4
CISPR 11 ®
Edition 6.2 2019-01
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
COMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES
Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
Appareils industriels, scientifiques et médicaux – Caractéristiques de
perturbations radioélectriques – Limites et méthodes de mesure
– 2 – CISPR 11:2015+AMD1:2016
+AMD2:2019 CSV © IEC 2019
CONTENTS
FOREWORD . 8
INTRODUCTION . 11
Introduction to Amendment 1 . 12
Introduction to the Amendment 2 . 12
1 Scope . 15
2 Normative references . 15
3 Terms and definitions . 16
4 Frequencies designated for ISM use . 19
5 Classification of equipment . 20
5.1 Separation into groups . 20
5.2 Division into classes . 20
5.3 Documentation for the user . 21
6 Limits of electromagnetic disturbances . 21
6.1 General . 21
6.2 Group 1 equipment measured on a test site . 22
6.2.1 Limits for conducted disturbances . 22
6.2.2 Limits of electromagnetic radiation disturbance. 25
6.3 Group 2 equipment measured on a test site . 28
6.3.1 Limits for conducted disturbances . 28
6.3.2 Limits of electromagnetic radiation disturbance. 29
6.4 Group 1 and group 2 class A equipment measured in situ . 36
6.4.1 Limits for conducted disturbances . 36
6.4.2 Limits of electromagnetic radiation disturbance. 36
7 Measurement requirements . 39
7.1 General . 39
7.2 Ambient noise . 39
7.3 Measuring equipment . 40
7.3.1 Measuring instruments. 40
7.3.2 Artificial network (AN) . 40
7.3.3 Voltage probe . 41
7.3.4 Antennas . 41
7.3.5 Artificial hand . 42
7.4 Frequency measurement . 43
7.5 Configuration of equipment under test. 43
7.5.1 General . 43
7.5.2 Interconnecting cables . 47
7.5.3 Connection to the electricity supply network on a test site . 48
7.6 Load conditions of equipment under test . 50
7.6.1 General . 50
7.6.2 Medical equipment . 50
7.6.3 Industrial equipment . 52
7.6.4 Scientific, laboratory and measuring equipment . 52
7.6.5 Microwave cooking appliances . 52
7.6.6 Other equipment in the frequency range 1 GHz to 18 GHz . 52
7.6.7 Electric welding equipment . 53
+AMD2:2019 CSV © IEC 2019
7.6.8 ISM RF lighting equipment . 53
7.6.9 Medium voltage (MV) and high voltage (HV) switchgear . 53
7.6.10 Grid connected power converters . 53
7.7 Recording of test-site measurement results . 54
7.7.1 General . 54
7.7.2 Conducted emissions . 54
7.7.3 Radiated emissions . 54
8 Special provisions for test site measurements (9 kHz to 1 GHz) . 54
8.1 Ground planes . 54
8.2 Measurement of conducted disturbances . 55
8.2.1 General . 55
8.2.2 Measurements on grid connected power converters . 55
8.2.3 Handheld equipment which are normally operated without an earth
connection . 60
8.3 Radiation test sites for OATS and SAC for measurements in the range 9 kHz
to 1 GHz . 60
8.3.1 General . 60
8.3.2 Validation of the radiation test site (9 kHz to 1 GHz) . 61
8.3.3 Disposition of equipment under test (9 kHz to 1 GHz) . 61
8.3.4 Radiation measurements (9 kHz to 1 GHz) . 62
8.4 Alternative radiation test sites for the frequency range 30 MHz to 1 GHz . 62
8.5 FAR for measurements in the range 30 MHz to 1 GHz . 62
9 Radiation measurements: 1 GHz to 18 GHz . 63
9.1 Test arrangement . 63
9.2 Receiving antenna . 63
9.3 Validation and calibration of test site . 63
9.4 Measuring procedure . 63
9.4.1 General . 63
9.4.2 Operating conditions of the EUT . 64
9.4.3 Preliminary Peak measurements . 65
9.4.4 Final Weighted measurements . 66
10 Measurement in situ . 69
11 Safety precautions for emission measurements on ISM RF equipment . 69
12 Measurement uncertainty . 69
Annex A (informative) Examples of equipment classification . 71
Annex B (informative) Precautions to be taken in the use of a spectrum analyzer (see
7.3.1) . 73
Annex C (normative) Measurement of electromagnetic radiation disturbance in the
presence of signals from radio transmitters . 74
Annex D (informative) Propagation of interference from industrial radio-frequency
equipment at frequencies between 30 MHz and 300 MHz . 75
Annex E (informative) Recommendations of CISPR for protection of certain radio
services in particular areas . 76
E.1 General . 76
E.2 Recommendations for protection of safety-related radio services . 76
E.3 Recommendations for protection of specific sensitive radio services . 76
Annex F (informative) Frequency bands allocated for safety-related radio services . 77
Annex G (informative) Frequency bands allocated for sensitive radio services . 78
– 4 – CISPR 11:2015+AMD1:2016
+AMD2:2019 CSV © IEC 2019
Annex H (informative) Statistical assessment of series produced equipment against
the requirements of CISPR standards . 80
H.1 Significance of a CISPR limit . 80
H.2 Type tests . 80
H.3 Statistical assessment of series produced equipment . 80
H.3.1 Assessment based on a general margin to the limit . 80
H.3.2 Assessment based on the non-central t-distribution . 81
H.3.3 Assessment based on the binomial distribution . 83
H.3.4 Equipment produced on an individual basis . 84
Annex I (normative) Artificial Network (AN) for the assessment of disturbance
voltages at d.c. power ports of semiconductor power converters . 85
I.1 General information and purpose . 85
I.2 Structures for a DC-AN . 85
I.2.1 AN suitable for measurement of unsymmetrical mode (UM) disturbances . 85
I.2.2 AN suitable for measurement of common mode (CM) and differential
mode (DM) disturbances . 85
I.2.3 AN suitable for measurement of UM, CM and DM disturbances . 86
I.3 Employment of DC-ANs for compliance measurements . 86
I.3.1 General . 86
I.3.2 Pseudo V-AN . 86
I.3.3 Delta-AN . 86
I.4 Normative technical requirements for the DC-AN . 87
I.4.1 Parameters and associated tolerances in the range 150 kHz to 30 MHz . 87
I.4.2 Parameters and associated tolerances in the range 9 kHz to 150 kHz . 88
I.5 Examples of practical implementations of DC-ANs . 88
Annex J (informative) Measurements on Grid Connected Power Converters (GCPC) –
Setups for an effective test site configuration . 91
J.1 General information and purpose . 91
J.2 Setup of the test site . 91
J.2.1 Block diagram of test site . 91
J.2.2 DC power supply . 92
J.2.3 AC power source . 92
J.2.4 Other components . 93
J.3 Other test setups . 93
J.3.1 Configuration comprising laboratory AC power source and resistive load . 93
J.3.2 Configuration in case of reverse power flow to the AC mains . 94
Annex K (informative) Test site configuration and instrumentation – Guidance on
prevention of saturation effects in mitigation filters of transformer-less power
converters during type tests according to this standard . 96
K.1 General information and purpose . 96
K.2 Recommendations for avoidance of saturation effects in the range 9 kHz to
150 kHz . 97
K.3 Detailed advice . 97
K.3.1 General . 97
K.3.2 Insert of series inductors (or common mode chokes) in the laboratory's
d.c. power supply chain . 98
K.3.3 Employment of additional common mode decoupling capacitors at the
interface between the AE port of the DC-AN and the laboratory d.c.
power supply port allocated in the test environment . 99
+AMD2:2019 CSV © IEC 2019
K.4 Background information . 100
Bibliography . 102
Figure 1 – Circuit for disturbance voltage measurements on mains supply . 41
Figure 2 – Artificial hand, RC element . 43
Figure 3 – Example for a typical cable arrangement for measurements of radiated
disturbances in 3 m separation distance, Table-top EUT . 45
Figure 4 – Example for a typical test set up for measurement of conducted and/or
radiated disturbances from a floor standing EUT, 3D view . 46
Figure 5 – Disposition of medical (capacitive type) and dummy load . 51
Figure 6 – Typical arrangement for measurement of conducted disturbances at LV d.c.
power ports with the DC-AN used as termination and decoupling unit to the laboratory
d.c. power source . 57
Figure 7 – Typical arrangement for measurement of conducted disturbances at LV d.c.
power ports with the DC-AN used as termination and voltage probe . 58
Figure 8 – Typical arrangement for measurement of conducted disturbances at LV d.c.
power ports with the DC-AN used as voltage probe and with a current probe – 2D
diagram . 59
Figure 9 – Typical arrangement for measurement of conducted disturbances at LV d.c.
power ports with a DC-AN used as voltage probe and with a current probe – 3D
diagram . 59
Figure 10 – Test site . 61
Figure 11 – Minimum size of metal ground plane . 61
Figure 12 – Decision tree for the measurement of emissions from 1 GHz to 18 GHz of
group 2 equipment operating at frequencies above 400 MHz . 64
Figure H.1 – An example of possible difficulties . 83
Figure I.1 – Practical implementation of a 150 Ω DC-AN suitable for measurement of
UM disturbances (Example) . 88
Figure I.2 – Practical implementation of a 150 Ω DC-AN suitable for measurement of
CM and DM disturbances (Example, see also Figure A.2 in CISPR 16-1-2:2014) . 89
Figure I.3 – Practical implementation of a 150 Ω DC-AN suitable for measurement of
UM, or CM and DM disturbances (Example 1) . 89
Figure I.4 – Practical implementation of a 150 Ω DC-AN suitable for measurement of
UM, or CM and DM disturbances (Example 2) . 90
Figure I.5 – Practical implementation of a 150 Ω DC-AN suitable for measurement of
UM, or CM and DM disturbances (Example 3) . 90
Figure J.1 – Setup of the test site (Case 1) – 2D diagram . 91
Figure J.2 – Setup of the test site (Case 1) – 3D diagram . 92
Figure J.3 – Setup of the test site (Case 2) – 2D diagram . 93
Figure J.4 – Setup of the test site (Case 2) – 3D diagram . 94
Figure J.5 – Setup of the test site (Case 3) – 2D diagram . 95
Figure J.6 – Setup of the test site (Case 3) – 3D diagram . 95
Figure K.1 – Flow of the common mode RF current at test site configuration level . 98
Figure K.2 – Blocking of flow of common mode RF current by insert of series inductors . 99
Figure K.3 – Blocking of flow of common mode RF current by employment of
additional CM decoupling capacitors . 99
Figure K.4 – CM termination impedance at the EUT port of a DC-AN – Magnitude-
versus-frequency characteristic in the range 3 kHz to 30 MHz, Example . 100
– 6 – CISPR 11:2015+AMD1:2016
+AMD2:2019 CSV © IEC 2019
Figure K.5 – Prevention of saturation of mitigation filters by use of additional
decoupling capacitors . 101
Figure K.6 – Change in the resonant frequency caused by the increase and decrease
in the decoupling capacitor's capacitance . 101
Figure K.7 – DC-AN circuit example where capacitance of blocking capacitors of the
LC decoupling circuit can be increased or decreased . 101
Table 1 – Frequencies in the radio-frequency (RF) range designated by ITU for use as
fundamental ISM frequencies . 20
Table 2 – Disturbance voltage limits for class A group 1 equipment measured on a test
site (a.c. mains power port) . 23
Table 3 – Limits for conducted disturbances of class A group 1 equipment measured
on a test site (d.c. power port) . 24
Table 4 – Disturbance voltage limits for class B group 1 equipment measured on a test
site (a.c. mains power port) . 24
Table 5 – Disturbance voltage limits for class B group 1 equipment measured on a test
site (d.c. power port) . 25
Table 6 – Electromagnetic radiation disturbance limits for class A group 1 equipment
measured on a test site . 27
Table 7 – Electromagnetic radiation disturbance limits for class B group 1 equipment
measured on a test site . 27
Table 8 – Disturbance voltage limits for class A group 2 equipment measured on a test
site (a.c. mains power port) . 29
Table 9 – Disturbance voltage limits for class B group 2 equipment measured on a test
site (a.c. mains power port) . 29
Table 10 – Electromagnetic radiation disturbance limits for class A group 2 equipment
measured on a test site . 31
Table 11 – Electromagnetic radiation disturbance limits for class A EDM and arc
welding equipment measured on a test site . 32
Table 12 – Electromagnetic radiation disturbance limits for class B group 2 equipment
measured on a test site . 33
Table 13 – Electromagnetic radiation disturbance peak limits for group 2 equipment
operating at frequencies above 400 MHz . 34
Table 14 – Electromagnetic radiation disturbance weighted limits for group 2
equipment operating at frequencies above 400 MHz . 35
–1
Table 15 – Electromagnetic radiation disturbance APD level corresponding to 10
limits for class B group 2 equipment operating at frequencies above 400 MHz . 36
Table 16 – Electromagnetic radiation disturbance limits for class A group 1 equipment
measured in situ . 37
Table 17 – Electromagnetic radiation disturbance limits for class A group 2 equipment
measured in situ . 38
Table 18 – Frequency sub-ranges to be used for weighted measurements .
Table 19 – Applicability of measurements at d.c. power ports . 25
Table 20 – Frequency sub-ranges to be used for weighted measurements . 68
Table E.1 – Limits for electromagnetic radiation disturbances for in situ measurements
to protect specific safety-related radio services in particular areas . 76
Table H.1 – General margin to the limit for statistical evaluation . 81
Table H.2 – The non-central t-distribution factor k as a function of the sample size n . 82
Table H.3 – Application of the binomial distribution . 84
+AMD2:2019 CSV © IEC 2019
Table I.1 – Parameters and associated tolerances in the range 150 kHz to 30 MHz . 87
Table I.2 – Parameters and associated tolerances in the range 9 kHz to 150 kHz . 88
– 8 – CISPR 11:2015+AMD1:2016
+AMD2:2019 CSV © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
_____________
INDUSTRIAL, SCIENTIFIC AND MEDICAL EQUIPMENT –
RADIO-FREQUENCY DISTURBANCE CHARACTERISTICS –
LIMITS AND METHODS OF MEASUREMENT
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC 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.
This consolidated version of the official IEC Standard and its amendments has been
prepared for user convenience.
CISPR 11 edition 6.2 contains the sixth edition (2015-06) [documents CISPR/B/628/FDIS
and CISPR/B/631/RVD], its amendment 1 (2016-06) [documents CISPR/B/627/CDV and
CISPR/B/639A/RVC] and its amendment 2 (2019-01) [documents CIS/B/715A/FDIS and CIS/
B/719/RVD].
In this Redline version, a vertical line in the margin shows where the technical content is
modified by amendments 1 and 2. Additions are in green text, deletions are in
strikethrough red text. A separate Final version with all changes accepted is available in
this publication.
+AMD2:2019 CSV © IEC 2019
International Standard CISPR 11 has been prepared by CISPR Subcommittee B: Interference
relating to industrial, scientific and medical radio-frequency apparatus, to other (heavy)
industrial equipment, to overhead power lines, to high voltage equipment and to electric
traction.
This sixth edition introduces and permits type testing on components of power electronic
equipment, systems and installations. Its emission limits apply now to low voltage (LV) a.c.
and d.c. power ports, irrespective of the direction of power transmission. Several limits were
adapted to the practical test conditions found at test sites. They are also applicable now to
power electronic ISM RF equipment used for wireless power transfer (WPT), for instant power
supply and charging purposes. The limits in the range 1 GHz to 18 GHz apply now to CW-type
disturbances and to fluctuating disturbances in a similar, uniform and technology-neutral way.
For these measurements, two alternative methods of measurement are available, the
traditional log-AV method and the new APD method.
For measurements at LV d.c. power ports of power electronic equipment, a modern
implementation of the 150 Ω Delta-network specified in CISPR 16-1-2 has been made
available.
This International Standard CISPR 11 has the status of a Product Family EMC standard in
accordance with IEC Guide 107, Electromagnetic compatibility – Guide to the drafting of
electromagnetic compatibility publications (2014).
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of the base publication and its amendments will
remain unchanged until the 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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
– 10 – CISPR 11:2015+AMD1:2016
+AMD2:2019 CSV © IEC 2019
The main content of this standard is based on CISPR Recommendation No. 39/2 given below:
RECOMMENDATION No. 39/2
Limits and methods of measurement of electromagnetic disturbance characteristics
of industrial, scientific and medical (ISM) radio-frequency equipment
The CISPR
CONSIDERING
a) that ISM RF equipment is an important source of disturbance;
b) that methods of measuring such disturbances have been prescribed by the CISPR;
c) that certain frequencies are designated by the International Telecommunication Union
(ITU) for unrestricted radiation from ISM equipment,
RECOMMENDS
that the latest edition of CISPR 11 be used for the application of limits and methods of
measurement of ISM equipment.
+AMD2:2019 CSV © IEC 2019
INTRODUCTION
This CISPR publication contains, amongst common requirements for the control of RF
disturbances from equipment intended for use in industrial, scientific, and medical electrical
applications, specific requirements for the control of RF disturbances caused by ISM RF
applications in the meaning of the definition of the International Telecommunication Union
(ITU), see also Definition 3.13 in this International Standard. CISPR and ITU share their
responsibility for the protection of radio services in respect of the use of ISM RF applications.
The CISPR is concerned with the control of RF disturbances from ISM RF applications by
means of an assessment of these disturbances either at a standardised test site or, for an
individual ISM RF application which cannot be tested at such a site, at its place of operation.
Consequently, this CISPR Publication covers requirements for conformity assessment of both,
equipment assessed by means of type tests at standardised test sites or of individual
equipment under in situ conditions.
The ITU is concerned with the control of RF disturbances from ISM RF applications during
normal operation and use of the respective equipment at its place of operation (see
Definition 1.15 in the ITU Radio Regulations). There, use of radio-frequency energy
decoupled from the ISM RF application by radiation, induction or capacitive coupling is
restricted to the location of that individual application.
This CISPR publication contains, in 6.3, the essential emission requirements for an
assessment of RF disturbances from ISM RF applications at standardised test sites. These
requirements allow for type testing of ISM RF applications operated at frequencies up to
18 GHz. It further contains, in 6.4, the essential emission requirements for an in situ
assessment of RF disturbances from individual ISM RF applications in the frequency range up
to 1 GHz. All requirements were established in close collaboration with the ITU and enjoy
approval of the ITU.
However, for operation and use of several types of ISM RF applications the manufacturer,
installer and/or customer should be aware of additional national provisions regarding possible
licensing and particular protection needs of local radio services and applications. Depending
on the country concerned, such additional provisions may apply to individual ISM RF
applications operated at frequencies outsides designated ISM bands (see Table 1). They also
may apply to ISM RF applications operated at frequencies above 18 GHz. For the latter type
of applications, local protection of radio services and appliances requires an accomplishment
of the conformity assessment by application of the relevant national provisions in the
frequency range above 18 GHz in accordance with vested interests of the ITU and national
administrations. These additional national provisions may apply to spurious emissions,
emissions appearing at harmonics of the operation frequency, and to wanted emissions at the
operation frequency allocated outside a designated ISM band in the frequency range above
18 GHz.
Recommendations of CISPR for the protection of radio services in particular areas are foun
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...