IEC 61000-4-39:2017

IEC 61000-4-39 ®
Edition 1.0 2017-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
BASIC EMC PUBLICATION
PUBLICATION FONDAMENTALE EN CEM
Electromagnetic compatibility (EMC) –
Part 4-39: Testing and measurement techniques – Radiated fields in close
proximity – Immunity test
Compatibilité électromagnétique (CEM) –
Partie 4-39: Techniques d'essai et de mesure – Champs rayonnés à proximité –
Essai d'immunité
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IEC 61000-4-39 ®
Edition 1.0 2017-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
BASIC EMC PUBLICATION
PUBLICATION FONDAMENTALE EN CEM

Electromagnetic compatibility (EMC) –

Part 4-39: Testing and measurement techniques – Radiated fields in close

proximity – Immunity test
Compatibilité électromagnétique (CEM) –

Partie 4-39: Techniques d'essai et de mesure – Champs rayonnés à proximité –

Essai d'immunité
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.100.20 ISBN 978-2-8322-4082-3

– 2 – IEC 61000-4-39:2017  IEC 2017

CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 10
2 Normative references . 10
3 Terms, definitions and abbreviated terms . 11
3.1 Terms and definitions . 11
3.2 Abbreviated terms . 12
4 General . 13
5 Test levels . 14
5.1 General . 14
5.2 Test frequencies . 14
5.3 Test levels in the frequency range of 9 kHz to 150 kHz . 15
5.4 Test levels in the frequency range of 150 kHz to 26 MHz . 16
5.5 Test levels in the frequency range of 26 MHz to 380 MHz . 16
5.6 Test levels in the frequency range of 380 MHz to 6 GHz . 16
6 Test equipment . 18
6.1 Magnetic field immunity . 18
6.1.1 General . 18
6.1.2 Magnetic field immunity 9 kHz to 150 kHz . 18
6.1.3 Magnetic field immunity 150 kHz to 26 MHz . 19
6.2 Radiated RF field immunity . 19
6.2.1 Field generating devices, 26 MHz to 380 MHz . 19
6.2.2 Field generating devices, 380 MHz to 6 GHz . 19
7 Test setup . 20
7.1 Magnetic field immunity . 20
7.1.1 Test facility . 20
7.1.2 Arrangement of equipment under test . 20
7.1.3 Test method using radiating loop . 22
7.2 Radiated RF field immunity . 22
7.2.1 Test facility . 22
7.2.2 Arrangement of equipment under test . 22
8 Test procedure . 23
8.1 General . 23
8.2 Climatic conditions . 23
8.3 Electromagnetic conditions . 24
8.4 Arrangement and operating modes of the EUT . 24
8.5 Magnetic field immunity . 24
8.5.1 Level setting procedure 9 kHz to 150 kHz . 24
8.5.2 Level setting procedure 150 kHz to 26 MHz . 24
8.5.3 Execution of the test . 25
8.6 Radiated RF field immunity . 27
8.6.1 Level setting procedure . 27
8.6.2 Execution of test . 27
9 Evaluation of test results . 30

10 Test report . 30
Annex A (normative) TEM horn antenna . 32
A.1 General . 32
A.2 Frequency range . 32
A.3 VSWR . 32
A.4 Field distribution . 32
A.5 General design for TEM horn antenna . 34
Annex B (informative) Test frequencies, levels and modulations . 36
B.1 General . 36
B.2 Magnetic emitters in the range from 9 kHz to 26 MHz . 36
B.3 Radio services in the range from 26 MHz to 6 GHz . 36
Annex C (informative) In situ testing . 39
C.1 General . 39
C.2 Test procedure . 39
C.3 Test report . 39
Bibliography . 40

Figure 1 – Overview showing the test methods that could be used for evaluating
equipment immunity to disturbances from RF transmitters . 13
Figure 2 – Close-proximity test methods addressed in this document . 14
Figure 3 – Definition of the 80 % amplitude-modulated (AM) test level and the
waveshapes occurring at the output of the signal generator . 15
Figure 4 – Example of the pulse-modulated (50 % duty cycle, 217 Hz) test level and
the waveshapes occurring at the output of the signal generator . 17
Figure 5 – Example of equipment testing on floor-standing EUT using radiating loop
antenna – Frequency range 9 kHz to 150 kHz (100 mm x 100 mm window size) . 21
Figure 6 – Example of equipment testing on floor-standing EUT using radiating loop
antenna – Frequency range 150 kHz to 26 MHz (80 mm x 80 mm window size) . 21
Figure 7 – Principle of equipment testing on floor-standing EUT using TEM horn
antenna . 23
Figure 8 – Radiating loop level setting . 25
Figure 9 – Principle of equipment testing with radiating loop . 26
Figure 10 – Example of the test pattern using a 300 mm x 300 mm window size for the
uniform area . 28
Figure 11 – Arrangement of level setting . 29
Figure 12 – Example of TEM horn antenna orientations . 30
Figure A.1 – Example of field uniformity verification setup . 33
Figure A.2 – Field uniformity measurement setup . 34
Figure A.3 – Example of field uniformity at 1,5 GHz (simulated) for TEM horn antenna
having an aperture dimension of 205 mm x 205 mm . 34
Figure A.4 – Example of general design principle of TEM horn antenna . 35

Table 1 – Test levels for inhomogeneous magnetic fields, 9 kHz to 150 kHz . 15
Table 2 – Test levels for inhomogeneous magnetic fields, 150 kHz to 26 MHz . 16
Table 3 – Test levels for RF fields from transmitters used in close proximity, 380 MHz
to 6 GHz . 17

– 4 – IEC 61000-4-39:2017  IEC 2017
Table 4 – Definition of window size and test distance . 22
Table 5 – Maximum frequency steps size, magnetic field immunity test . 26
Table B.1 – Guidance on test levels of certain RF wireless communications equipment . 37

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROMAGNETIC COMPATIBILITY (EMC) –

Part 4-39: Testing and measurement techniques –
Radiated fields in close proximity –
Immunity test
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-
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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
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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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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61000-4-39 has been prepared by subcommittee 77B: High
frequency phenomena, of IEC technical committee 77: Electromagnetic compatibility.
It forms Part 4-39 of the IEC 61000 series. It has the status of a basic EMC publication in
accordance with IEC Guide 107.
The text of this standard is based on the following documents:
FDIS Report on voting
77B/769/FDIS 77B/772/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.

– 6 – IEC 61000-4-39:2017  IEC 2017
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 61000 series, published under the general title Electromagnetic
compatibility (EMC), can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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.
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 (in so far 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 as technical specifications or technical reports, 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).
Particular considerations for IEC 61000-4-39
This part of IEC 61000 is an international standard which gives immunity requirements and
test procedures related to radiated disturbances caused by radio-frequency fields from
devices used in close proximity.
It is impossible to ignore that the everyday electromagnetic environment has greatly changed.
Not long ago, handheld, frequency-modulated (FM) transceivers for business, public safety,
and amateur radio communications represented the predominant RF applications. Distribution
was limited (for example, by licenses) and in most cases the radiating antennas were outside
buildings to get a high efficiency. The situation changed once technology allowed the
manufacturing of compact wireless phones with low weight and a reasonable price. Wireless
services (DECT, mobile phones, UMTS/WiFi/WiMAX/ Bluetooth® , baby monitors, etc.) have
___________
Bluetooth is the trade name of a product supplied by Bluetooth SIG This information is given for the
convenience of users of this document and does not constitute an endorsement by IEC of this product.
Equivalent products may be used if they can be shown to lead to the same results.

– 8 – IEC 61000-4-39:2017  IEC 2017
come into widespread use and acceptance. Recognizing the fact that equipment for these new
technologies could have the antenna inside the building and even inside the device housing
and be omnipresent in nearly any setting including at work, in the home and in public
transportation creates new situations for exposure of equipment to RF energy.
With the new digital technologies, the traditional modulation methods of AM and FM has given
way to digital modulations with a variety of different amplitude and bandwidth characteristics.
While overall time-averaged transmit power levels might have generally decreased over time
due to improved network density and migration of services, the maximum possible (peak
pulse) power levels in other bands have increased significantly. Moreover, the incorporation
of multiple transmitting antennas (to support for example WiFi and Bluetooth links), evolving
form factors, higher bit rates to facilitate data transfer and Internet access and the use of
wireless headsets have resulted in a more complex and diverse pattern of use and exposure.
Increased portability of transmitting devices has also drastically reduced the separation
distance between sources of radiated RF energy and equipment likely to be disturbed by that
energy.
It should be expected that the wireless technology revolution will continue to evolve with new
applications using increasingly higher microwave frequencies.
Immunity testing according to existing standards, such as IEC 61000-4-3, 61000-4-20, 61000-
4-21 and 61000-4-22, may not be suitable to assess compatibility with the complex electric
and magnetic fields generated by RF emitters located in close proximity (for example, within a
few centimetres) of the surface of electronic equipment. The power levels required for the
higher disturbance intensities associated with such very small separation distances may make
application of some of the existing test standards quite challenging or cost prohibitive.
New technologies use also magnetic fields. The fields are inhomogeneous and vary
appreciably in both magnitude and direction over a region of space. Typically they can be
generated by motors, power transformers, switching power supplies, higher-powered
electronic article surveillance (EAS) gates or transmitters of radio-frequency identification
(RFID) systems, inductive charging systems and near field communication (NFC) devices.
The fields from such sources decrease rapidly as the distance from the source increases.
Because these new technologies use a very large range of the frequency spectrum it is
necessary to use different test methods which consider the physical behavior of magnetic
coupling in the lower frequency range and the more electrical based characteristic in the
higher frequency range. Additionally, the widely diverging physical and electrical
characteristics of equipment types that may be affected by portable transmitters in close
proximity, as well as the applications for which such equipment is used, indicate a need for
multiple test methods.
At present this document covers magnetic field disturbance sources in the frequency range 9
kHz to 26 MHz.In the frequency range 26 MHz to 380 MHz no testing is yet defined. In the
frequency range 380 MHz to 6 GHz testing using a TEM horn antenna is defined. It has been
argued that especially in the frequency range above 380 MHz the specified test methods do
not take into consideration the possible variations in field impedance from real life close
proximity transmitters, which may represent sources having field impedances far below the far
field impedance of 377 Ω (predominantly magnetic field sources) and far above 377 Ω
(predominantly electrical field sources). In the frequency range above 380 MHz the signal
wavelength is such that the reactive nearfield from the source begins at only a few
centimeters from the source (around approximately 0,1 λ). At this distance the field
impedance approximates more and more to the far field impedance of 377 Ω. The TEM horn
antenna represents a field source which is not far from 377 Ω.

Activities are ongoing to identify antenna types that can be characterised by field impedance
and radiation pattern over a specified illumination window size, which for the ease of testing
should be as large as possible and should preferably cover a large frequency range. Antenna
types that are not covered by manufacturer’s intellectual property rights, and which can be
unambiguously characterised by for instance near field scanning or numerical model
characterisation, are preferred for the present basic standard.

– 10 – IEC 61000-4-39:2017  IEC 2017
ELECTROMAGNETIC COMPATIBILITY (EMC) –

Part 4-39: Testing and measurement techniques –
Radiated fields in close proximity –
Immunity test
1 Scope
This part of IEC 61000 specifies immunity requirements for electrical and electronic
equipment when it is exposed to radiated electromagnetic energy from RF transmitters used
in close proximity. It establishes test levels and the required test procedures. The applicable
frequency range is 9 kHz to 6 GHz. Fixed-installation equipment being exposed to portable
transmitting devices, mobile equipment exposed to fixed transmitting devices and mobile
equipment exposed to other mobile transmitting devices are considered.
The object of this document is to establish a common reference for evaluating the immunity
requirements of electrical and electronic equipment that is exposed to radiated, RF
electromagnetic fields from sources at close distances. It is understood that this part of
IEC 61000 does not replace general immunity requirements of electrical and electronic
equipment to radiated electromagnetic energy as given in IEC 61000-4-3 and other parts of
IEC 61000 and that it is only applicable if an equipment or system is exposed to disturbance
sources in close proximity.
In the context of this document, “close proximity” generally refers to a separation distance
between the source and victim equipment of less than or equal to 200 mm for frequencies
greater than 26 MHz and 500 mm for frequencies lower than 26 MHz.
The test methods documented in this part of IEC 61000 describe consistent methods to
assess the immunity of an equipment or system against a defined phenomenon in the
respective frequency range. Product committees would consider the applicability of the test
and then if necessary select the applicable test method depending on the EUT, frequency
range, disturbance source, etc.
NOTE As described in IEC Guide 107, this is a basic EMC publication for use by product committees of the IEC.
As also stated in Guide 107, the IEC product committees are responsible for determining whether this immunity
test standard should be applied or not, and if applied, they are responsible for determining the appropriate test
levels and performance criteria. TC 77 and its sub-committees are prepared to co-operate with product committees
in the evaluation of the value of particular immunity tests for their products.
This document deals with immunity tests related to RF magnetic and electromagnetic fields
from any source used in close proximity to other electrical or electronic equipment or systems.
This document is an independent test method. Other test methods should not be used as
substitutes for claiming compliance with 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 (IEV) – Part 161: Electromagnetic
compatibility (available at www.electropedia.org)

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.
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
NOTE Where the terms “voltage” and “current” are used in this document, they mean the r.m.s. values of an
alternating or direct voltage or current unless stated otherwise.
3.1.1
electromagnetic compatibility
EMC
ability of equipment to function satisfactorily in its electromagnetic environment without
introducing intolerable electromagnetic disturbances to anything in that environment
[SOURCE: IEC 60050-161:1990, 161-01-07]
3.1.2
electromagnetic disturbance
any electromagnetic phenomenon which can degrade the performance of a device, equipment
or system or adversely affect living or inert matter.
Note 1 to entry: An electromagnetic disturbance can be electromagnetic noise, an unwanted signal or a change in
the propagation medium itself.
[SOURCE: IEC 60050-161:1990, 161-01-05]
3.1.3
(electromagnetic) emission
phenomenon by which electromagnetic energy emanates from a source
[SOURCE: IEC 60050-161:1990, 161-01-08]
3.1.4
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.
[SOURCE: IEC 60050-161:1990, 161-01-01]
3.1.5
far field
that region of the electromagnetic field of an antenna wherein the predominant components of
the field are those which represent a propagation of energy and wherein the angular field
distribution is essentially independent of the distance from the antenna
Note 1 to entry: In the far field region, all the components of the electromagnetic field decrease in inverse
proportion to the distance from the antenna.
Note 2 to entry: For a broadside antenna having a maximum overall dimension D which is large compared to the
wavelength λ, the far field region is commonly taken to exist at distances greater than 2D /λ, from the antenna in
the direction of maximum radiation.

– 12 – IEC 61000-4-39:2017  IEC 2017
[SOURCE: IEC 60050-712:1992, 712-02-02, modified – the word "region" has been removed
from the term.]
3.1.6
field strength
electric or magnetic component of the field
Note 1 to entry: Field strength may be expressed as V/m or A/m.
Note 2 to entry: For measurements made in the near field, the term "electric field strength" or "magnetic field
strength" is used according to whether the resultant electric or magnetic field, respectively, is measured. In this
field region, the relationship between the electric and magnetic field strength and distance is complex and difficult
to predict, being dependent on the specific configuration involved. Inasmuch as it is not generally feasible to
determine the time and space phase relationship of the various components of the complex field, the power flux
density of the field is similarly indeterminate.
3.1.7
immunity (to a disturbance)
ability of a device, equipment or system to perform without degradation in the presence of an
electromagnetic disturbance
[SOURCE: IEC 60050-161:1990, 161-01-20]
3.1.8
immunity test level
the level of a test signal used to simulate an electromagnetic disturbance when performing an
immunity test
[SOURCE: IEC 60050-161:1990, 161-04-41]
3.1.9
reactive near field (region)
near field
that region of space immediately surrounding an antenna, where the predominant components
of the electromagnetic field are those which represent an exchange of reactive energy
between the antenna and the surrounding medium
[SOURCE: IEC 60050-712:1992, 712-02-01, modified – in the term, "induction field (region)"
has been replaced by "near field".]
3.1.10
polarisation
orientation of the electric field vector of a radiated field
3.1.11
radio frequency
RF
frequency in the portion of the electromagnetic spectrum that is between the audio-frequency
portion and the infrared portion and that is useful for radio transmission
3.2 Abbreviated terms
For the purposes of this document, the following abbreviated terms apply.
CDMA Code division multiple access
DECT Digital Enhanced Cordless Telecommunication
EAS Electronic article surveillance
EUT Equipment under test
FRS Family radio service
GMRS General mobile radio service
GSM Global system for mobile communication
iDEN integrated digital enhanced network
LTE Long term evolution
NFC Near field communication
RFID Radio-frequency identification
TEM transverse electromagnetic
TETRA Trans-European trunked radio
UMTS Universal Mobile Telecom System
VSWR Voltage standing wave ratio
WiMAX Worldwide interoperability for microwave access
WLAN Wireless local area network
4 General
Immunity of EUTs to disturbances from RF transmitters can be tested using several different
methods, including those described in IEC 61000-4-3, IEC 61000-4-20, IEC 61000-4-21,
IEC 61000-4-22 and this part of IEC 61000, as shown in Figure 1. This part of IEC 61000
describes test methods unique to the situation in which the transmitter is used in close
proximity to the EUT and the case of inhomogeneous magnetic fields (see Figure 2). In this
context, “close proximity” generally refers to separation distances between the transmitter and
the equipment of 200 mm or less for RF fields (frequencies greater than 26 MHz) and 500 mm
for magnetic fields (frequencies lower than 26 MHz). Fixed-installation equipment being
exposed to portable transmitting devices, mobile equipment exposed to fixed transmitting
devices and mobile equipment exposed to other mobile transmitting devices are considered.
RF test methods
Reverberation TEM horn antenna
chamber IEC 61000-4-39
IEC 61000-4-21
Semi-anechoic
chamber or fully
anechoic room TEM waveguides
IEC 61000-4-3 IEC 61000-4-20
IEC 61000-4-22
IEC
Figure 1 – Overview showing the test methods that could be used for evaluating
equipment immunity to disturbances from RF transmitters

– 14 – IEC 61000-4-39:2017  IEC 2017
IEC 61000-4-39 test methods
Inhomogeneous Radiated RF fields Radiated RF fields
magnetic fields (26 MHz to 380 MHz) (380 MHz to 6 GHz)

120 mm loop 100 mm loop Under TEM horn
9 kHz to 150 kHz 150 kHz to 26 MHz consideration antenna

IEC
Figure 2 – Close-proximity test methods addressed in this document
5 Test levels
5.1 General
The electromagnetic disturbances considered in this document are limited to continuous
narrowband signals (which may be pulse- or amplitude-modulated by up to 1 kHz) but do not
include disturbance signals that are basically transient or impulsive in nature (as, for instance,
electromagnetic pulse). The frequencies or frequency bands to be selected for testing are
limited to those where intentional RF emitting devices actually operate.
The test level applied during testing should be selected in accordance with the expected
maximum output power of the transmitting device and the likely, or specified, separation
distance between its transmitting antenna and the equipment subject to the disturbance
created by the transmitting device. Additional information can be found in Annex B.
5.2 Test frequencies
It is not intended that the test be applied continuously over the entire frequency range
covered by this document. Rather, the frequency ranges to be tested shall be defined (for
example by the product committees) according to those frequencies where interference from
intentional transmitters in close proximity is expected to occur.
The applied test signal shall be stepped within each frequency range, according the following
conditions:
a) Frequency stepping is defined using linear steps in the frequency range below 26 MHz
(see Table 5 in 8.5.3).
b) Above 26 MHz the frequency steps are defined as 1 % of actual frequency, unless testing
is performed in specific radio transmission bands.
c) Additionally testing at spot frequencies may be performed at any frequency/frequencies of
interest.
d) If the testing is performed in a specific radio transmission band, the starting point for the
frequency steps is chosen as the center frequency of the selected range. Testing is then
performed at the step frequencies higher than the center frequency using step sizes of 1 %
of the actual frequency. Testing is also performed at frequencies lower than the center
frequency using step sizes of -1 % of actual frequency.

It is recommended to analyse potentially sensitive frequencies (for example clock frequencies)
separately, provided that these frequencies are within the frequency range to be tested.
5.3 Test levels in the frequency range of 9 kHz to 150 kHz
Test levels for inhomogeneous magnetic fields in the frequency range of 9 kHz to 150 kHz are
given in Table 1.
Table 1 – Test levels for inhomogeneous magnetic fields, 9 kHz to 150 kHz
Level Test field strength
A/m
1 1
2 3
3 10
4 30
X Special
NOTE X is an open test level and the associated field strength can
be any value. This level can be given in the product standard.

The test levels given in Table 1 are the amplitudes of the unmodulated carrier signal for level
setting. For testing of equipment, this carrier signal is 80 % amplitude modulated with a 1 kHz
sinewave to simulate actual disturbance sources (see Figure 3 and Clause B.2). Details of
how the test is performed are given in Clause 8.
NOTE Product committees can select alternative modulation schemes for equipment under test.
3 3
V
maximum rms
2 2
V
rms
V
1 rms 1
0 0
–1 –1
–2 –2
–3 –3
IEC IEC
a) Unmodulated RF signal b) Modulated RF signal 80% AM
V = 2,82 V V = 5,09 V
p-p p-p
V = 1,00 V V = 1,15 V
rms rms
V = 1,80 V
maximum rms
Figure 3 – Definition of the 80 % amplitude-modulated (AM) test level and the
waveshapes occurring at the output of the signal generator
V
p-p
V
p-p
– 16 – IEC 61000-4-39:2017  IEC 2017
5.4 Test levels in the frequency range of 150 kHz to 26 MHz
Test levels for inhomogeneous fields in the frequency range of 150 kHz to 26 MHz are given
in Table 2.
Table 2 – Test levels for inhomogeneous magnetic fields, 150 kHz to 26 MHz
Level Test field strength
A/m
1 0,1
2 0,3
3 1
4 3
X Special
NOTE X is an open test level and the associated field strength can
be any value. This level can be given in the product standard.

NOTE The test levels in Table 2 differ from Table 1 since they are based on the types of equipment and services
that create disturbances in the two different frequency ranges.
Annex B is intended to provide guidance on the selection of test levels (see also the last
paragraph of 5.1).
The test levels given in Table 2 are the amplitudes of the unmodulated carrier signal for level
setting. For testing of equipment this carrier signal is modulated using pulse modulation (see
Figure 4 and Clause B.2
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