IEC 61000-6-4:2018

IEC 61000-6-4 ®
Edition 3.0 2018-02
REDLINE VERSION
INTERNATIONAL
STANDARD
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BASIC EMC PUBLICATION
Electromagnetic compatibility (EMC) –
Part 6-4: Generic standards – Emission standard for industrial environments

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IEC 61000-6-4 ®
Edition 3.0 2018-02
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
BASIC EMC PUBLICATION
Electromagnetic compatibility (EMC) –

Part 6-4: Generic standards – Emission standard for industrial environments

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.100.10 ISBN 978-2-8322-5388-5

– 2 – IEC 61000-6-4:2018 RLV © IEC 2018

CONTENTS
FOREWORD . 4
INTRODUCTION . 2
1 Scope and object . 7
2 Normative references . 8
3 Terms, definitions and abbreviated terms . 9
3.1 Terms and definitions. 9
3.2 Abbreviated terms . 10
4 Conditions during testing . 12
5 Product documentation . 13
6 Applicability . 13
7 Measurement uncertainty . 13
8 Compliance with this document . 15
9 Emission requirements . 15
Application of limits in tests for conformity of equipment in series production.
Annex A (informative) Testing of DC powered systems . 20
Annex B (informative) Further information on measurements using a FAR . 22
B.1 General . 22
B.2 Analysis . 22
B.2.1 Theoretical analysis of simple radiators . 22
B.2.2 Limitations with the basic model . 23
B.2.3 Measurements on an EUT . 26
B.2.4 Derivation of limits . 27
B.3 Requirements . 28
Bibliography . 29

Figure 1 – Examples of ports . 9
Figure B.1 – Geometrical optics model for OATS measurements . 22
Figure B.2 – Field attenuation between two half-wave dipoles above ground plane with
fixed transmit antenna height and variable receive antenna height . 23
Figure B.3 – Equivalent circuit diagram of a typical EUT . 24
Figure B.4 – 10 m distance, horizontal polarization, calculated differences for an
electrically short straight wire above the ground plane on an OATS compared with a
FAR (E – E ) . 24
OATS FAR
Figure B.5 – 10 m distance, vertical polarization, calculated differences for an
electrically short straight wire above the ground plane on an OATS compared with a
FAR (E – E ) . 25
OATS FAR
Figure B.6 – 3 m distance, horizontal polarization, calculated differences for an
electrically short straight wire above the ground plane on an OATS compared with a
FAR (E – E ) . 25
OATS FAR
Figure B.7 – 3 m distance, vertical polarization, calculated differences for an
electrically short straight wire above the ground plane on an OATS compared with a
FAR (E – E ) . 26
OATS FAR
Figure B.8 – Differences of the horizontal polarised emission of the small EUT with
mains lead in the 3 m FARs and on 10 m OATS . 27

Table 1 − Emission .
Table 1 – Test arrangements of EUT . 12
Table 2 – Required highest frequency for radiated measurement . 16
Table 3 – Requirements for radiated emissions – enclosure port. 17
Table 4 – Requirements for conducted emissions – low voltage AC mains port . 18
Table 5 – Requirements for conducted emissions – wired network port . 18
Table A.1 – Proposed requirements for conducted emissions – DC power port . 20
Table A.2 – Conducted testing of DC powered equipment . 21
Table B.1 – Proposed requirements for radiated emissions, FAR . 28

– 4 – IEC 61000-6-4:2018 RLV © IEC 2018

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROMAGNETIC COMPATIBILITY (EMC) –

Part 6-4: Generic standards –
Emission standard for industrial environments

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
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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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 IEC 61000-6-4 has been prepared by CISPR subcommittee H: Limits
for the protection of radio services.
This third edition cancels and replaces the second edition published in 2006 and
Amendment 1:2010 This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) possible future requirements on DC ports;
b) possible future radiated polarity specific emission limits within a FAR;
c) the definition of which average detector is used for emission measurements at frequencies
above 1GHz and that results using a peak detector are acceptable for all measurements;
d) the definition of different EUT test arrangements.
The text of this International Standard is based on the following documents:
FDIS Report on voting
CIS/H/339A/FDIS CIS/H/350/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
It forms Part 6-4 of the IEC 61000 series of standards. It has the status of a basic EMC
publication in accordance with IEC Guide 107.
A list of all parts in the CISPR 61000 series, published under the general title Electromagnetic
compatibility, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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.
– 6 – IEC 61000-6-4:2018 RLV © IEC 2018

INTRODUCTION
IEC 61000 is published in separate parts according to the following structure:
Part 1: General
General considerations (introduction, fundamental principles)
Definitions, terminology
Part 2: Environment
Description of the environment
Classification of the environment
Compatibility levels
Part 3: Limits
Emission limits
Immunity limits (insofar as they do not fall under the responsibility of the product
committees)
Part 4: Testing and measurement techniques
Measurement techniques
Testing techniques
Part 5: Installation and mitigation guidelines
Installation guidelines
Mitigation methods and devices
Part 6: Generic standards
Part 9: Miscellaneous
Each part is further subdivided into several parts published either as International Standards
or technical reports/specifications, some of which have already been published as sections.
Others will be published with the part number followed by a dash and a second number
identifying the subdivision (example: IEC 61000-6-1).

ELECTROMAGNETIC COMPATIBILITY (EMC) –

Part 6-4: Generic standards –
Emission standard for industrial environments

1 Scope and object
This part of IEC 61000 for EMC emission requirements applies to electrical and electronic
apparatus intended for use in industrial environments as described below.
Emission requirements in the frequency range 0 Hz to 400 GHz are covered. No
measurement needs to be performed at frequencies where no requirement is specified.
This generic EMC emission standard is applicable if no relevant dedicated product or product-
family EMC emission standard exists.
This standard applies to a apparatus intended to be connected to a power network supplied
from a high or medium voltage transformer dedicated to the supply of an installation feeding
manufacturing or similar plant, and intended to operate in or in proximity to industrial locations,
as described below. This standard applies also to apparatus, which is battery operated and
intended to be used in industrial locations.
The environments encompassed by this standard are industrial, both indoor and outdoor.
Industrial locations are in addition characterised by the existence of one or more of the
following examples:
1)
– industrial, scientific and medical (ISM) ) apparatus;
– heavy inductive or capacitive loads that are frequently switched;
– high currents and associated magnetic fields.
The object of this standard is to define the emission test requirements for apparatus defined
in the scope in relation to continuous and transient, conducted and radiated disturbances.
The emission requirements have been selected so as to ensure that disturbances generated
by apparatus operating normally in industrial locations do not exceed a level that could
prevent other apparatus from operating as intended. Fault conditions of apparatus are not
taken into account. Not all disturbance phenomena have been included for testing purposes in
this standard but only those considered as relevant for the equipment covered by this
standard. These requirements represent essential electromagnetic compatibility emission
requirements.
This part of IEC 61000 for emission requirements applies to electrical and electronic
equipment intended for use within the environment existing at industrial (see 3.1.12) locations.
This document does not apply to equipment that fall within the scope of IEC 61000-6-3.
The environments encompassed by this document cover both indoor and outdoor locations.
___________
1)
As defined in CISPR 11.
– 8 – IEC 61000-6-4:2018 RLV © IEC 2018

Emission requirements in the frequency range 9 kHz to 400 GHz are covered in this document
and have been selected to provide an adequate level of protection of radio reception in the
defined electromagnetic environment. No measurement needs to be performed at frequencies
where no requirement is specified. These requirements are considered essential to provide an
adequate level of protection to radio services.
Not all disturbance phenomena have been included for testing purposes but only those
considered relevant for the equipment intended to operate within the environments included
within this document.
Requirements are specified for each port considered.
This generic EMC emission standard is to be used where no applicable product or product-
family EMC emission standard is available.
NOTE 1 Safety considerations are not covered by this document.
NOTE 2 In special cases, situations will arise where the levels specified in this document will not offer adequate
protection; for example where a sensitive receiver is used in close proximity to an apparatus equipment. In these
instances, special mitigation measures may have to be employed.
NOTE 3 Disturbances generated in fault conditions of equipment are not covered by this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60050-161, International Electrotechnical Vocabulary – Chapter 161: Electromagnetic
compatibility
IEC 61000-4-20:2010, Electromagnetic compatibility (EMC) – Part 4-20: Testing and
measurement techniques – Emission and immunity testing in transverse electromagnetic
(TEM) waveguide
CISPR 11:2015, Industrial, scientific and medical (ISM) radio-frequency equipment – Electro-
magnetic Radio-frequency disturbance characteristics – Limits and methods of measurement
CISPR 11:2015/AMD1:2016
CISPR 14-1:2016, Electromagnetic compatibility – Requirements for household appliances,
electric tools and similar apparatus – Part 1: Emission
CISPR 16-1-1:2015, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 1-1: Radio disturbance and immunity measuring apparatus – Measuring
apparatus
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 Coupling devices for conducted disturbances measurements
CISPR 16-1-4:2010, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 1-4: Radio disturbance and immunity measuring apparatus – Antennas
and test sites for radiated disturbance measurements
CISPR 16-1-4:2010/AMD1:2012
CISPR 16-1-4:2010/AMD2:2017
CISPR 16-1-6:2014, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 1-6: Radio disturbance and immunity measuring apparatus – EMC
antenna calibration
CISPR 16-1-6:2014/AMD1:2017
CISPR 16-2-1:2003 2014, Specification for radio disturbance and immunity measuring
apparatus and methods – Part 2-1: Methods of measurement of disturbances and immunity –
Conducted disturbance measurements
CISPR 16-2-1:2014/AMD1:2017
CISPR 16-2-3:2016, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 2-3: Methods of measurement of disturbances and immunity – Radiated
disturbance measurements
CISPR 16-4-2:2011, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 4-2: Uncertainties, statistics and limit modelling – Uncertainty in EMC
measurements Measurement instrumentation uncertainty
CISPR 16-4-2:2011/AMD1:2014
CISPR 22, Information technology equipment – Radio disturbance characteristics – Limits and
methods of measurement
CISPR 32:2015, Electromagnetic compatibility of multimedia equipment – Emission
requirements
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-161 and the
following apply.
NOTE Definitions related to EMC and to relevant phenomena are given in IEC 60050-161 and in other IEC and
CISPR publications.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
port
particular physical interface of the specified apparatus equipment with the external
electromagnetic environment
Note 1 to entry: See Figure 1.
EUT
Wired network port Low voltage AC mains port
Enclosure port
DC power port
IEC
Figure 1 – Examples of ports
– 10 – IEC 61000-6-4:2018 RLV © IEC 2018

3.1.2
enclosure port
physical boundary of the apparatus equipment which electromagnetic fields may radiate
through or impinge on
3.1.3
cable port
port at which a conductor or a cable is connected to the apparatus equipment
Note 1 to entry: Examples are signal, wired network, control and power ports.
3.1.4
telecommunications/ wired network port
point of connection for voice, data and signalling transfers intended to interconnect widely-
dispersed systems via such means as by direct connection to a single-user or multi-user
telecommunications networks (e.g. public switched telecommunications networks (PSTN)
integrated services digital networks (ISDN), x-type digital subscriber lines (xDSL), etc.), local
area networks (e.g. Ethernet, Token Ring, etc.) and similar networks)
Note 1 to entry: Examples of these include CATV, PSTN, ISDN, xDSL, LAN and similar networks.
Note 2 to entry: These ports may support screened or unscreened cables and may also carry AC or DC power
where this is an integral part of the telecommunication specification.
Note 3 to entry: A port generally intended for interconnection of components of an ITE system under test (e.g. RS-
232,RS-485, field buses in the scope of IEC 61158, IEEE Standard 1284 (parallel printer), Universal Serial Bus
(USB), IEEE Standard 1394 (“Fire Wire”), etc.) and used in accordance with its functional specifications (e.g. for
the maximum length of cable connected to it), is not considered to be a telecommunications wired network port.
Note 4 to entry: In previous editions of this document and many product standards, this port was defined as a
telecommunications or network port.
3.1.5
power port
port at which a conductor or cable carrying the primary electrical power needed for the
operation (functioning) of an apparatus or associated apparatus is connected to the apparatus
for the connection of the equipment to the primary electrical power supply
3.1.6
public mains network
electricity lines to which all categories of consumers have access and which are operated by
a supply or distribution undertaking for the purpose of supplying electrical energy
3.1.7
low voltage
LV
low tension
voltage having a value below a conventionally adopted limit
a set of voltage levels used for the distribution of electricity and whose upper limit is generally
accepted to be 1 000 V AC or 1 500 V DC
NOTE For the distribution of AC electric power, the upper limit is generally accepted to be 1 000 V.
[SOURCE: IEC 60050-601:1985, 601-01-26, modified – addition of the words "or 1 500 V DC"]
3.1.8
DC distribution network
local supply network in the infrastructure of a site or building intended for use by one or more
different types of equipment and providing power independent of the public mains network
Note 1 to entry: Connection to a remote local battery is not regarded as a DC distribution network, if such a link
comprises only power supply for a single piece of equipment.

3.1.9
low voltage AC mains port
port used to connect to the low voltage AC mains supply network to power the equipment
Note 1 to entry: Equipment with a DC power port is considered low voltage AC mains powered if it is powered
from an AC/DC power converter.
Note 2 to entry: The low voltage AC mains supply could be public or non-public.
3.1.10
highest internal frequency F
x
highest fundamental frequency generated or used within the EUT, or the highest frequency at
which it operates
3.1.11
small equipment
equipment, either positioned on a table top or standing on the floor which, including its cables
fits in a cylindrical test volume of 1,2 m in diameter and 1,5 m above the ground plane
Note 1 to entry: These dimensions are currently under discussion in CISPR.
3.1.12
industrial location
location characterized by a separate power network, supplied from a high- or medium-voltage
transformer, dedicated for the supply of the installation
Note 1 to entry: Industrial locations can generally be described by the existence of an installation with one or
more of the following characteristics:
• items of equipment installed and connected together and working simultaneously;
• significant amount of electrical power generated, transmitted and/or consumed;
• frequent switching of heavy inductive or capacitive loads;
• high currents and associated magnetic fields;
• presence of industrial, high power scientific and medical (ISM) equipment (for example, welding machines).
The electromagnetic environment at an industrial location is predominantly produced by the equipment and
installation present at the location. There are types of industrial locations where some of the electromagnetic
phenomena appear in a more severe degree than in other installations.
Example locations include metalworking, pulp and paper, chemical plants, car production, farm building, high-
voltage areas of airports
Note 2 to entry: The connection between location and electromagnetic environment is given in 3.1.13.
3.1.13
electromagnetic environment
totality of electromagnetic phenomena existing at a given location
Note 1 to entry: In general, the electromagnetic environment is time-dependent and its description may need a
statistical approach.
Note 2 to entry: It is very important not to confuse the electromagnetic environment and the location itself.
[SOURCE IEC 60050-161:1990, 161-01-01, modified – Note 2 to entry has been added.]
3.2 Abbreviated terms
AAN Asymmetric Artificial Network
AC Alternating Current
AMN Artificial Mains Network
CATV Cable TV network
DC Direct Current
– 12 – IEC 61000-6-4:2018 RLV © IEC 2018

DSL Digital Subscriber Line
EUT Equipment Under Test
FAR Fully Anechoic Room
FSOATS Free Space Open Area Test Site
ISDN Integrated Services Digital Network
ITE Information Technology Equipment
LAN Local Area Network
MME Multi Media Equipment
OATS Open Area Test Site
PSTN Public Switched Telephone Network
SAC Semi Anechoic Chamber
TEM Transverse Electromagnetic Mode
USB Universal Serial Bus
xDSL Generic term for all types of DSL technology
4 Conditions during testing
The EUT shall be tested in the operating mode producing the largest emission in the frequency
band being investigated, e.g. based on limited pre-tests and measured, consistent with normal
applications. The configuration of the test sample shall be varied to achieve maximum
emission consistent with typical applications and installation practice. Pre-testing may be
used to reduce test time.
If the apparatus EUT is part of a system, or can be connected to auxiliary apparatus
associated equipment, the apparatus EUT shall be tested while connected to the minimum
representative configuration of auxiliary apparatus associated equipment necessary to
exercise the ports in a similar manner to that described in CISPR 11 and or CISPR 22 32.
The EUT shall be arranged in accordance with the requirements of Table 1.
Table 1 – Test arrangements of EUT
Intended operational Test arrangement Remarks
arrangement(s) of EUT
Table-top only Table-top
Floor-standing only Floor-standing
Can be floor-standing or table-top Table-top
Rack mounted In a rack or table-top
Other, for example wall mounted, Table-top With normal orientation
ceiling mounted, handheld, body
If the equipment is designed to be
worn
mounted on a ceiling, the downward-
facing portion of the EUT may be
oriented facing upward.
If a physical hazard would be caused by testing the device on a table-top, then it can be tested as floor standing
and the test report shall document the decision and justification.

In cases where a manufacturer's specification requires external filtering and/or shielding
devices or measures that are clearly specified in the user's manual, the test requirements of
this document shall be applied with the specified devices or measures in place.

The configuration and mode of operation during the measurements shall be precisely noted in
the test report. If the apparatus EUT has a large number of similar ports or ports with many
similar connections, a sufficient number shall be selected to simulate actual operating
conditions and to ensure that all the different types of termination are covered.
The measurements shall be carried out at one single set of parameters within the operating
ranges of temperature, humidity and atmospheric pressure specified for the product and at the
rated supply voltage, unless otherwise indicated in the basic standard. The relevant
conditions shall be recorded in the test report.
Where applicable, additional information on EUT configuration can be found in CISPR 16-2-1,
CISPR 16-2-3, CISPR 11 or CISPR 32 as referenced in Table 3 to Table 5.
5 Product documentation
The purchaser/user/installer shall be informed within the product documentation if special
measures have to be taken to achieve compliance. One example would be the need to use of
shielded or special cables.
6 Applicability
The application of measurements for emission(s) depends on the particular apparatus
equipment, its configuration, its ports, its technology and its operating conditions.
Measurements shall be applied to the relevant ports of the apparatus equipment according to
the requirements defined in Table 1 3 to Table 5. Measurements shall only be carried out
where the relevant ports exist.
It may be determined from consideration of the electrical characteristics and usage of
particular apparatus equipment that some of the measurements are inappropriate and
therefore unnecessary. In such a case it is required that the decision and justification not to
measure shall be recorded in the test report.
7 Measurement uncertainty
The results of measurements of emissions from ITE shall reference the measurement
instrumentation uncertainty considerations contained in CISPR 16-4-2.
Determining compliance with the limits in this standard shall be based on the results of the
compliance measurement, not taking into account measurement instrumentation uncertainty.
However measurement uncertainty of the measurement instrumentation and its associated
connections between the various instruments in the measurement chain shall be calculated
and both the measurement results and the calculated uncertainty shall appear in the test
report.
– 14 – IEC 61000-6-4:2018 RLV © IEC 2018

Table 1 − Emission
Port Frequency range Limits Basic standard Applicability note Remarks
1) 30 MHz – 230 MHz CISPR 16-2-3 See Note 1. May be measured
40 dB(µV/m) Quasi-peak at 10 m
Enclosure port – Open area 230 MHz – 1 000 MHz at 30 m distance
47 dB(µV/m) Quasi-peak at 10 m

test site or semi-anechoic using the limits
method decreased by 10
dB.
2) 0,15 MHz – 0,5 MHz CISPR 16-2-1, 7.4.1 See Note 2.
79 dB(µV) quasi-peak
Low voltage AC mains port
CISPR 16-1-2, 4.3
66 dB(µV)average
0,5 MHz – 30 MHz 73 dB(µV) quasi-peak

60 dB(µV) average
3) 0,15 MHz – 0,5 MHz CISPR 22 See Notes 3, 4 and 5.
97 dB(µV) – 87 dB(µV) quasi-peak

Telecommunications/netwo
84 dB(µV) – 74 dB(µV) average
rk port
53 dB(µA) – 43 dB(µA) quasi-peak
40 dB(µA) – 30 dB(µA) average
0,5 MHz – 30 MHz See Notes 3 and 5.
87 dB(µV) quasi-peak
74 dB(µV) average
43 dB(µA) quasi-peak
30 dB(µA) average
NOTE 1 If the internal emission source(s) is operating at a frequency below 9 kHz then measurements need only to be performed up to 230 MHz.
NOTE 2 Impulse noise (clicks) which occur less than five times per minute is not considered. For clicks appearing more often than 30 times per minute the limits
apply. For clicks appearing between 5 and 30 times per minute, a relaxation of the limits is allowed of 20 log 30/N dB (where N is the number of clicks per minute).
Criteria for separated clicks may be found in CISPR 14-1.
NOTE 3 At transitional frequencies the lower limit applies.
NOTE 4 The limits decrease linearly with the logarithm of the frequency in the range 0,15 MHz to 0,5 MHz.
NOTE 5 The current and voltage disturbance limits are derived for use with an impedance stabilization network (ISN) which presents a common mode
(asymmetric mode) impedance of 150 Ω to the telecommunication port under test (conversion factor is 20 log 150 / l = 44 dB).
– 15 – IEC 61000-6-4:2018 RLV © IEC 2018

Where guidance for the calculation of the instrumentation uncertainty of a measurement is
specified in CISPR 16-4-2 this shall be followed, and for these measurements the
determination of compliance with the limits in this document shall take into consideration the
measurement instrumentation uncertainty in accordance with CISPR 16-4-2. Calculations to
determine the measurement result and any adjustment of the test result required when the
test laboratory uncertainty is larger than the value for U given in CISPR 16-4-2 shall be
cispr
included in the test report.
8 Compliance with this document
Where this document gives options for testing particular requirements with a choice of test
methods, compliance can be shown against any of the relevant test methods, using the
specific limits with the restrictions provided in the relevant tables clauses. For example, floor
standing shall be assessed against table clause 3.1, considering table clause 3.2 is limited to
small equipment and table clause 3.3 is limited to table top equipment.
In any situation where it is necessary to retest the equipment the test method originally
chosen shall be used in order to ensure consistency of the results.
Equipment which fulfils the requirements across the frequency ranges specified in Table 3 to
Table 5 in this document is deemed to fulfil the requirements in the entire frequency range
from 9 kHz to 400 GHz.
Measurements do not need to be performed at frequencies where no limits are specified.
NOTE CISPR TR 16-4-3 provides guidance on the applicability of limits to series produced equipment.
9 Emission requirements
The emission requirements for apparatus equipment covered by this document are given on a
port by port basis and defined in Table 3 to Table 5. Annex A is provided for information
purposes only and lists proposed limits for DC power ports.
The measurements shall be conducted in a well-defined and reproducible manner and
performed in any order.
The measurements may be performed in any order.
The description of the measurement, the measurement instrumentation, the measurement
methods, and the measurement set-up to be used are given in the standards, which are
referred to in Table 1 3 to Table 5. These standards are not repeated here, however
modifications or additional information needed for the practical application of the
measurements are given in this document.
The contents of the standards referenced in the tables are not repeated here, however
modifications or additional information needed for the practical application of the
measurements are given in this standard.
The following shall be taken into account during the application of the measurements defined
in Table 3 to Table 5.
• At transitional frequencies, the lower limit applies.
• Where the limit value varies over a given frequency range, it changes linearly with respect
to the logarithm of the frequency.
• The test site shall be validated for the measurement distance chosen.

– 16 – IEC 61000-6-4:2018 RLV © IEC 2018

• Where the table clause defines more than one detector, then the measurements shall be
performed using both types of detector. Results obtained using a peak detector may be
used instead of the other defined detectors.
• Where a different measurement distance is chosen, other than the reference distance
defined in the limit column of Table 3, the limits shall be offset based upon the following
formula:
new limit = defined limit – 20 log (measurement distance/reference distance)
The unit of metres shall be used for distance and dB(µV/m) for the limits.
With regard to each table clause, the measurements shall be performed at only one
distance.
• For radiated emission measurements, Table 2 shows the highest frequency up to which
radiated emission measurements shall be performed based up the value of F .
x
Table 2 – Required highest frequency for radiated measurement
Highest internal frequency Highest measured frequency
(F )
x
F ≤ 108 MHz 1 GHz
x
108 MHz < F ≤ 500 MHz 2 GHz
x
5 GHz
500 MHz < F ≤ 1 GHz
x
F > 1 GHz 5 × F up to a maximum of 6 GHz
x x
NOTE 1 Where the highest internal frequency is not known, tests are performed up to 6 GHz.
NOTE 2 F is defined in 3.1.10.
x
• For emission measurements above 1 GHz, the peak detector limits shall not be applied to
disturbances produced by arcs or sparks that are high voltage breakdown events. Such
disturbances arise when devices contain or control mechanical switches that control
current in inductors, or when devices contain or control subsystems that create static
electricity (such as paper handling devices). The average limits apply to disturbances from
arcs or sparks, and both peak and average limits will apply to other disturbances from
such devices.
• For radiated emission measurements using a FSOATS, FAR or SAC, the measurement
distance is the horizontal distance between the vertical projections of the calibration point
of the receiving antenna and the boundary of the EUT. The boundary of the EUT is the
smallest imaginary circular periphery around the most compact arrangement of the EUT,
using typical spacing.
• Where this document specifies the use of an average detector, the linear average detector
defined in Clause 6 of CISPR 16-1-1:2015 shall be used.
NOTE In the measurement specifics columns of Table 3 to Table 5, where relevant, the format is as follows:
characteristic, basic standard, clause. For example, from table clause 3.1, Instrumentation, CISPR 16-1-1:2015,
Clause 4.
– 17 – IEC 61000-6-4:2018 RLV © IEC 2018

Table 3 – Requirements for radiated emissions – enclosure port
Limits
dB(µV/m)
Frequency
Table Test Measurement
a
range Limitations and restrictions
a
Detector /
clause facility specifics
MHz
measurement
distance
3.1 OATS or 30 to 230 40 Instrumentation, Allowed measurement distances:
SAC Quasi-peak / CISPR 16-1-1, Clause 4 3 m, 5 m, 10 m or 30 m
10 m
Antennas, For equipment meeting the size
230 to 1 000 47 CISPR 16-1-4, 4.5 criterion defined in 3.1.11, the
measurements may be performed
Quasi-peak /
Test site,
at the 3 m distance. Note this size
10 m
CISPR 16-1-4, Clause 5
criterion is currently under
discussion.
Method,
CISPR 16-2-3, 7.3
For measurement distances less
than 30 m, the receiving antenna
height shall be varied between 1 m
to 4 m, else 1 m to 6 m shall be
used. Additional guidance on the
test method can be found in
CISPR 16-2-3, 7.3 and Clause 8.
3.2 TEM 30 to 230 40 IEC 61000-4-20 Only applicable to battery powered
Quasi-peak / n/a equipment not intended to have
external cables attached.
230 to 1 000 47
Restricted to equipment complying
Quasi-peak / n/a
with the definition of small
equipment within 6.2 in IEC 61000-
4-20.
3.3 FAR 30 to 230 52 to 45 Instrumentation, Restricted to table top equipment,
Quasi-peak / CISPR 16-1-1, Clause 4 and floor-standing equipment
3 m which can be placed on table
Antennas,
during the test.
230 to 1 000 52 CISPR 16-1-4, 4.5
Allowed measurement distances:
Quasi-peak /
Test site,
3 m, 5 m or 10 m
3 m
CISPR 16-1-4, 5.4.7
The limitations on EUT size in
Method,
CISPR 16-2-3 apply.
CISPR 16-2-3, 7.4.
3.4 FSOATS 1 000 to 76 Instrumentation, Allowed measurement distances:
3 000 Peak / 3 m CISPR 16-1-1, Clauses 5 3 m, 5 m or 10 m.
OATS and 6
Other faciliti
...