CISPR 11:2024

CISPR 11 ®
Edition 7.0 2024-02
COMMENTED VERSION
INTERNATIONAL
STANDARD
colour
inside
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
PRODUCT FAMILY EMC STANDARD
Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
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CISPR 11 ®
Edition 7.0 2024-02
COMMENTED VERSION
INTERNATIONAL
STANDARD
colour
inside
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
PRODUCT FAMILY EMC STANDARD
Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.100.10 ISBN 978-2-8322-8316-5
– 2 – CISPR 11:2024 CMV © IEC 2024
CONTENTS
FOREWORD .7
INTRODUCTION . 10
1 Scope . 14
2 Normative references . 14
3 Terms, definitions and abbreviated terms . 16
3.1 Terms and definitions . 16
3.2 Abbreviated terms . 21
4 Frequencies designated for ISM use . 22
5 Classification of equipment . 23
5.1 Separation into groups . 23
5.2 Division into classes . 23
5.3 Documentation for the user . 23
6 Limits of electromagnetic disturbances . 24
6.1 General . 24
6.2 Group 1 equipment measured on a test site . 24
6.2.1 Limits for conducted disturbances . 24
6.2.2 Limits of electromagnetic radiation disturbance . 29
6.3 Group 2 equipment measured on a test site . 32
6.3.1 Limits for conducted disturbances . 32
6.3.2 Limits of electromagnetic radiation disturbance . 33
6.4 Group 1 and group 2 class A equipment measured in situ . 39
6.4.1 Limits for conducted disturbances . 39
6.4.2 Limits of electromagnetic radiation disturbance . 39
7 Measurement requirements . 42
7.1 General . 42
7.2 Ambient noise . 42
7.3 Measuring equipment . 43
7.3.1 Measuring instruments. 43
7.3.2 Artificial network (AN) . 43
7.3.3 Voltage probe . 44
7.3.4 Antennas . 44
7.3.5 Artificial hand . 45
7.4 Frequency measurement. 46
7.5 Configuration of equipment under test . 46
7.5.1 General . 46
7.5.2 Interconnecting EUT cables and components . 49
7.5.3 Connection to the electricity supply network on a test site . 50
7.5.4 Measurements of robots . 53
7.6 Load conditions of the EUT . 57
7.6.1 General . 57
7.6.2 Medical equipment . 57
7.6.3 Industrial equipment . 59
7.6.4 Scientific, laboratory and measuring equipment . 59
7.6.5 Microwave cooking appliances . 59
7.6.6 Other equipment in the frequency range 1 GHz to 18 GHz . 59
7.6.7 Electric welding equipment . 60

7.6.8 ISM RF lighting equipment . 60
7.6.9 Medium voltage (MV) and high voltage (HV) switchgear . 60
7.6.10 Grid connected power converters . 60
7.6.11 Robots . 61
7.7 Recording of test-site measurement results . 61
7.7.1 General . 61
7.7.2 Conducted emissions. 62
7.7.3 Radiated emissions . 62
8 Special provisions for test site measurements (9 kHz to 1 GHz) . 62
8.1 Ground planes . 62
8.2 Measurement of conducted disturbances . 62
8.2.1 General . 62
8.2.2 Measurements on grid connected power converters . 63
8.2.3 Handheld equipment which is normally operated without an earth
connection . 68
8.3 OATS and SAC for measurements in the range 9 kHz to 1 GHz . 68
8.3.1 General . 68
8.3.2 Validation of the radiation test site (9 kHz to 1 GHz) . 69
8.3.3 Disposition of equipment under test (9 kHz to 1 GHz) . 69
8.3.4 Radiation measurements (9 kHz to 1 GHz) . 70
8.4 Alternative radiation test sites for the frequency range 30 MHz to 1 GHz . 70
8.5 FAR for measurements in the range 30 MHz to 1 GHz . 70
9 Radiation measurements: 1 GHz to 18 GHz . 70
9.1 Test arrangement . 70
9.2 Receiving antenna . 71
9.3 Validation and calibration of test site . 71
9.4 Measuring procedure . 71
9.4.1 General . 71
9.4.2 Operating conditions of the EUT (group 2 equipment only) . 72
9.4.3 Peak measurements (group 2 equipment only) . 72
9.4.4 Weighted measurements (group 2 equipment only) . 73
10 Measurement in situ . 74
11 Safety precautions for emission measurements on ISM RF equipment . 75
12 Measurement uncertainty . 75
Annex A (informative) Examples of equipment classification . 76
A.1 General . 76
A.2 Group 1 equipment . 76
A.2.1 General Group 1 equipment . 76
A.2.2 Detailed Group 1 equipment . 76
A.3 Group 2 equipment . 77
A.3.1 General Group 2 equipment . 77
A.3.2 Detailed Group 2 equipment . 77
Annex B (informative) Precautions to be taken in the use of a spectrum analyzer
(see 7.3.1) .
Annex B (normative) Measurement of electromagnetic radiation disturbance in
the presence of signals from radio transmitters . 79
Annex D (informative) Propagation of interference from industrial radio-frequency
equipment at frequencies between 30 MHz and 300 MHz .

– 4 – CISPR 11:2024 CMV © IEC 2024
Annex C (informative) Recommendations of CISPR for protection of certain radio
services in particular areas . 81
C.1 General . 81
C.2 Recommendations for protection of safety-related radio services . 81
C.3 Recommendations for protection of specific sensitive radio services . 83
Annex F (informative) Frequency bands allocated for safety-related radio services. 71
Annex G (informative) Frequency bands allocated for sensitive radio services . 72
Annex H (informative) Statistical assessment of series produced equipment against
the requirements of CISPR standards . 74
Annex I (normative) Artificial Network (AN) for the assessment of disturbance
voltages at d.c. power ports of semiconductor power converters . 79
Annex D (informative) Measurements on Grid Connected Power Converters (GCPC) –
Setups for an effective test site configuration . 100
D.1 General information and purpose . 100
D.2 Setup of the test site . 100
D.2.1 Block diagram of test site . 100
D.2.2 DC power supply . 101
D.2.3 AC power source . 101
D.2.4 Other components . 102
D.3 Other test setups . 102
D.3.1 Configuration comprising laboratory AC power source and resistive load . 102
D.3.2 Configuration with reverse power flow into the AC mains . 104
Annex E (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. 106
E.1 General information and purpose . 106
E.2 Recommendations for avoidance of saturation effects in the range 9 kHz to
150 kHz . 107
E.3 Detailed advice . 107
E.3.1 General . 107
E.3.2 Insert of series inductors (or common mode chokes) in the laboratory's
DC power supply chain . 108
E.3.3 Employment of additional common mode decoupling capacitors at
the interface between the AE port of the DC-AN and the laboratory DC
power supply port allocated in the test environment . 109
E.4 Background information . 110
Annex F (normative) Additional requirements for equipment with radio functionality . 113
F.1 Configuration of the EUT during emission tests. 113
F.2 Radiated emissions . 113
F.3 Conducted emissions . 113
Bibliography . 115
List of comments . 118

Figure 1 – Circuit for disturbance voltage measurements on mains supply . 44
Figure 2 – Artificial hand, RC element . 46
Figure 3 – Example for a typical cable arrangement for measurements of radiated
disturbances in 3 m separation distance, Table-top EUT. 48
Figure 4 – Example for a typical test set up for measurement of conducted and/or
radiated disturbances from a floor standing EUT, 3D view . 49

Figure 5 – EUT boundary determination for radiated disturbance measurements of
robots with extendable/moving arm . 53
Figure 6 – Example of a typical test setup for conducted disturbance measurement on
a floor-standing robot system . 54
Figure 7 – Example of a typical test setup for radiated disturbance measurement on a
floor-standing robot system . 55
Figure 8 – Example of a typical test setup for conducted disturbance measurement on
a combination robot system . 56
Figure 9 – Example of a typical test setup for radiated disturbance measurement on a
combination robot system . 57
Figure 10 – Disposition of medical equipment (capacitive type) and dummy load . 58
Figure 11 – Typical arrangement for measurement of conducted disturbances at LV DC
power ports with the DC-AN used as termination and decoupling unit to the laboratory
DC power source . 65
Figure 12 – Typical arrangement for measurement of conducted disturbances at LV DC
power ports with the DC-AN used as termination and voltage probe . 66
Figure 13 – Typical arrangement for measurement of conducted disturbances at LV DC
power ports with the DC-AN used as voltage probe and with a current probe – 2D
diagram . 67
Figure 14 – Typical arrangement for measurement of conducted disturbances at LV DC
power ports with a DC-AN used as voltage probe and with a current probe – 3D
diagram . 67
Figure 15 – Radiation test site . 69
Figure 16 – Minimum size of metal ground plane . 69
Figure 17 – Decision tree for the measurement of emissions from 1 GHz to 18 GHz of
group 2 equipment operating at frequencies above 400 MHz . 72
Figure D.1 – Setup of the test site (Case 1) – 2D diagram Test setup for Case 1
(schematic) . 100
Figure D.2 – Setup of the test site (Case 1) – 3D diagram Test setup for Case 1 (3D view) 101
Figure D.3 – Setup of the test site (Case 2) – 2D diagram Test setup for Case 2
(schematic) . 103
Figure D.4 – Setup of the test site (Case 2) – 3D diagram Test setup for Case 2 (3D view) 103
Figure D.5 – Setup of the test site (Case 3) – 2D diagram Test setup for Case 3
(schematic) . 104
Figure D.6 – Setup of the test site (Case 3) – 3D diagram Test setup for Case 3 (3D view) 105
Figure E.1 – Flow of the common mode RF current at test site configuration level . 108
Figure E.2 – Blocking of flow of common mode RF current by insert of series inductors . 109
Figure E.3 – Blocking of flow of common mode RF current by employment of additional
CM decoupling capacitors . 109
Figure E.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 . 110
Figure E.5 – Prevention of saturation of mitigation filters by use of additional decoupling
capacitors . 111
Figure E.6 – Change in the resonant frequency caused by the increase and decrease in
the decoupling capacitor's capacitance . 111
Figure E.7 – DC-AN circuit example where capacitance of blocking capacitors of the LC
decoupling circuit can be increased or decreased . 112
Table 1 – Frequencies in the radio-frequency (RF) range designated by ITU for use as
fundamental ISM frequencies . 22

– 6 – CISPR 11:2024 CMV © IEC 2024
Table 2 – Disturbance voltage limits for class A group 1 equipment measured on a test
site (AC mains power port) . 26
Table 3 – Limits for conducted disturbances of class A group 1 equipment measured on
a test site (DC power port). 27
Table 4 – Disturbance voltage limits for class B group 1 equipment measured on a test
site (AC mains power port) . 27
Table 5 – Disturbance voltage limits for class B group 1 equipment measured on a test
site (DC power port) . 28
Table 6 – Applicability of measurements at DC power ports . 28
Table 7 – Limits for conducted disturbances measured on a test site (wired network
port) . 29
Table 8 – Electromagnetic radiation disturbance limits for class A group 1 equipment
measured on a test site . 30
Table 9 – Electromagnetic radiation disturbance limits for class B group 1 equipment
measured on a test site . 30
Table 10 – Required highest frequency for radiated measurements . 31
Table 11 – Electromagnetic radiation disturbance limits for group 1 equipment measured
on a test site . 32
Table 12 – Disturbance voltage limits for class A group 2 equipment measured on a test
site (AC mains power port) . 33
Table 13 – Disturbance voltage limits for class B group 2 equipment measured on a test
site (AC mains power port) . 33
Table 14 – Electromagnetic radiation disturbance limits for class A group 2 equipment
measured on a test site . 35
Table 15 – Electromagnetic radiation disturbance limits for class A EDM and arc welding
equipment measured on a test site . 36
Table 16 – Electromagnetic radiation disturbance limits for class B group 2 equipment
measured on a test site . 37
Table 17 – Electromagnetic radiation disturbance peak limits for group 2 equipment
operating at frequencies above 400 MHz . 38
Table 18 – Electromagnetic radiation disturbance weighted limits for group 2 equipment
operating at frequencies above 400 MHz . 38
–1
Table 19 – Electromagnetic radiation disturbance APD level corresponding to 10 limits
for class B group 2 equipment operating at frequencies above 400 MHz . 39
Table 20 – Electromagnetic radiation disturbance limits for class A group 1 equipment
measured in situ . 40
Table 21 – Electromagnetic radiation disturbance limits for class A group 2 equipment
measured in situ . 41
Table 22 – Operation modes for fixed robots . 61
Table 23 – Operation modes for mobile robots . 61
Table 24 – Frequency subranges to be used for weighted measurements . 73
Table C.1 – Limits for electromagnetic radiation disturbances for in situ measurements
to protect specific safety-related radio services in particular areas . 81
Table C.2 – Frequency bands allocated for safety-related radio services. 82
Table C.3 – Frequency bands allocated for sensitive radio services . 84
Table F.1 – Disturbance voltage and current limits for group 1 and group 2 equipment
measured on a test site (antenna port) . 114

INTERNATIONAL ELECTROTECHNICAL COMMISSION
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
_____________
INDUSTRIAL, SCIENTIFIC AND MEDICAL EQUIPMENT –
RADIO-FREQUENCY DISTURBANCE CHARACTERISTICS –
LIMITS AND METHODS OF MEASUREMENT

FOREWORD
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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
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
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the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
This commented version (CMV) of the official standard CISPR 11:2024 edition 7.0 allows
the user to identify the changes made to the previous
CISPR 11:2015+AMD1:2016+AMD2:2019 CSV edition 6.2. Furthermore, comments from
CISPR Subcommittee B experts are provided to explain the reasons of the most relevant
changes, or to clarify any part of the content.
A vertical bar appears in the margin wherever a change has been made. Additions are in
green text, deletions are in strikethrough red text. Experts' comments are identified by a
blue-background number. Mouse over a number to display a pop-up note with the
comment.
This publication contains the CMV and the official standard. The full list of comments is
available at the end of the CMV.

– 8 – CISPR 11:2024 CMV © IEC 2024
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 seventh edition cancels and replaces the sixth edition published in 2015,
Amendment 1:2016 and Amendment 2:2019. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) introduction of limits for radiated disturbances in the frequency range above 1 GHz for
group 1 equipment in line with the requirements given in the generic emission standards;
b) introduction of limits for conducted disturbances on the wired network port in line with the
requirements given in the generic emission standards;
c) introduction of requirements for equipment which incorporates radio transmit/receive
functions;
d) introduction of definitions for various types of robots;
e) consideration of some particular conditions when measuring robots, such as measurement
setups and operating modes of robots.
The text of this document is based on the following documents:
Draft Report on voting
CIS/B/831/FDIS CIS/B/837/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
This document 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 committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
IMPORTANT – The "colour inside" logo on the cover page of this document 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 document 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 11:2024 CMV © IEC 2024
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 3.1.18 in this document. CISPR and ITU share their responsibilities 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 (2020)). 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 can apply to individual ISM RF
applications operated at frequencies outside designated ISM bands (see Table 1). They also
may can 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 C of this document.
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 11:2024 CMV © IEC 2024
Introduction to Amendment 1
This Amendment introduces the fully-anechoic room (FAR) for measurements of the disturbance
field strength in the range 30 MHz to 1 GHz on equipment in the scope of CISPR 11.
It contains the complete set of requirements for measurement of radiated disturbances from
equipment fitting into the validated test volume of a given FAR. It specifies a separation distance
of 3 m and restricts use of the FAR to measurements on table-top equipment.
At the moment the FAR can be used:
• for measurements on table-top equipment fitting into the validated test volume of the given
FAR,
• for a separation distance of 3 m only, and
• if the FAR was validated according to CISPR 16-1-4.
The limits for class A and class B group 1 equipment in this CDV base on the limits in the
generic emission standards IEC 61000-6-3:2006/AMD 1 (2010) and
IEC 61000-6-4:2006/AMD 1 (2010). The limits for class A and class B group 2 equipment were
derived using the same approximation formula as used when deriving the limits for the generic
emission standards in mid of the years 2000 to 2010. CISPR/H/104/INF, published in 2005,
gives detailed explanations how these limits for the FAR were derived.
More detailed background information is still found in CISPR/B/627/CDV.
CISPR/B WG1 in October 2015
Introduction to the Amendment 2
This AMD 2 combines the contents of two fragments which have been circulated as
CIS/B/688/CDV (f2) and CIS/B/697/CDV (f3).
Fragment 2: Requirements for semiconductor power converters (SPC)
CISPR 11 Ed. 6.1 needs to be supplemented with further information for full inclusion of type
test requirements for SPCs specified hereafter. These requirements apply only to the following
types of equipment:
a) power conversion equipment intended for assembly into photovoltaic power generating
systems, such as grid connected power converters (GCPCs) and d.c. to d.c. converters,
b) GCPCs intended for assembly into energy storage systems.
Fragment 3: Improvement of repeatability for measurements in the frequency range 1-18 GHz
Based on the comments from the National Committees on CIS/B/662/DC, CIS/B/WG1 decided
on its meeting in Hangzhou 2016 to amend the test procedure for group 2 equipment in the
frequency range 1 to 18 GHz for the following reasons:
a) CISPR 11 allows final measurements on group 2 equipment operating at frequencies above
400 MHz with two different weighting functions, the traditional “LogAV detector” with a video
bandwidth of 10 Hz and the new APD method, where the Amplitude Probability Distribution
is evaluated.
With the alignment of emission requirements for sources of fluctuating emissions with those
generating CW-type emissions (Fraction 4 of the last general maintenance of CISPR 11) for
most of the frequency range 1 to 18 GHz the peak detector is used mostly for preliminary

measurements, while the number of final measurements with the LogAV detector has been
increased from 2 frequencies to max. 7 frequencies.
In parallel, with fraction 3, the APD detector has been introduced,
...