IEC 61000-4-3:2006/AMD2:2010

IEC 61000-4-3 ®
Edition 3.0 2010-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BASIC EMC PUBLICATION
PUBLICATION FONDAMENTALE EN CEM
AMENDMENT 2
AMENDEMENT 2
Electromagnetic compatibility (EMC) –
Part 4-3: Testing and measurement techniques – Radiated, radio-frequency,
electromagnetic field immunity test

Compatibilité électromagnétique (CEM) –
Partie 4-3: Techniques d'essai et de mesure – Essai d'immunité aux champs
électromagnétiques rayonnés aux fréquences radioélectriques

IEC 61000-4-3:2006/A2:2010
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IEC 61000-4-3 ®
Edition 3.0 2010-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BASIC EMC PUBLICATION
PUBLICATION FONDAMENTALE EN CEM
AMENDMENT 2
AMENDEMENT 2
Electromagnetic compatibility (EMC) –
Part 4-3: Testing and measurement techniques – Radiated, radio-frequency,
electromagnetic field immunity test

Compatibilité électromagnétique (CEM) –
Partie 4-3: Techniques d'essai et de mesure – Essai d'immunité aux champs
électromagnétiques rayonnés aux fréquences radioélectriques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
F
CODE PRIX
ICS 33.100.20 ISBN 978-2-88910-373-7
– 2 – 61000-4-3 Amend. 2 © IEC:2010
FOREWORD
This amendment has been prepared by subcommittee 77B: High frequency phenomena, of
IEC technical committee 77: Electromagnetic compatibility.
The text of this amendment is based on the following documents:
FDIS Report on voting
77B/626/FDIS 77B/629/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base 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• withdrawn,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.
_____________
CONTENTS
Add the title of Annex J as follows:
Annex J (informative) Measurement uncertainty due to test instrumentation

Add, after Annex I, the following new Annex J:

61000-4-3 Amend. 2 © IEC:2010 – 3 –
Annex J
(informative)
Measurement uncertainty due to test instrumentation

J.1 General
This annex gives information related to measurement uncertainty (MU) of the test level setting
according to the particular needs of the test method contained in the main body of the
standard. Further information can be found in [1, 2] .
This annex shows an example of how an uncertainty budget can be prepared based upon
level setting. Other parameters of the disturbance quantity such as modulation frequency and
modulation depth, harmonics produced by the amplifier may also need to be considered in an
appropriate way by the test laboratory. The methodology shown in this annex is considered to
be applicable to all parameters of the disturbance quantity.
The uncertainty contribution for field homogeneity including test site effects is under
consideration.
J.2 Uncertainty budgets for level setting
J.2.1 Definition of the measurand
The measurand is the hypothetical test electric field strength (without an EUT) at the point of
the UFA selected according to the process of 6.2.1 step a) and 6.2.2 step a) of this standard.
J.2.2 MU contributors of the measurand
The following influence diagram (see Figure J.1) gives an example of influences upon level
setting. It applies to both calibration and test processes and it should be understood that the
diagram is not exhaustive. The most important contributors from the influence diagram have
been selected for the uncertainty budget Tables J.1 and J.2. As a minimum, the contributions
listed in Tables J.1 and J.2 shall be used for the calculation of the uncertainty budgets in
order to get comparable budgets for different test sites or laboratories. It is noted that a
laboratory may include additional contributors in the calculation of the MU, on the basis of its
particular circumstances.
___________
Figures in square brackets refer to the reference documents in Clause J.4.

– 4 – 61000-4-3 Amend. 2 © IEC:2010

Antenna location and
Power meter (PM)
absorber placement
Field probe
calibration Anisotropy
Distance of EUT front
Mismatch
Frequency from antenna during test
Linearity
PM - directional coupler
interpolation error
Uncertainty in
level setting
Stability and drift
Mismatch
Power amplifier (PA)
of signal generator
antenna - PA
short and long
term stability
Software
Field disturbance
PA compression
“window” caused by movable objects
(e.g. camera)
IEC  431/10
Figure J.1 – Example of influences upon level setting
J.2.3 Calculation examples for expanded uncertainty
It shall be recognized that the contributions that apply for calibration and for test may not be
the same. This leads to different uncertainty budgets for each process.
In this basic standard, the field inside the chamber is calibrated before the test upon an EUT.
Depending on the test setup, several contributors may not be a factor in calculating MU.
Examples include those that are compensated by level control of the amplifier output power or
that remain unchanged between calibration and test (e.g. mismatch between antenna and
amplifier).
The field probe and the power monitoring instrumentation (repeatability rather than absolute
measurement accuracy and linearity) are not included in the level control of the amplifier
output power and their contributions shall be considered in evaluating MU.
Tables J.1 and J.2 give examples of an uncertainty budget for level setting. The uncertainty
budget consists of two parts, the uncertainty for calibration and the uncertainty for test.
Table J.1 – Calibration process
Symbol Uncertainty Source X U(x ) Unit Distribution Divisor u(x ) Unit c u (y) Unit u (y)
i i i i i i
FP Field probe calibration 1,7 dB normal k =2 2 0,85 dB 1 0,85 dB 0,72
PM Power meter 0,3 dB rect 1,73 0,17 dB 1 0,17 dB 0,03
c
PA PA rapid gain variation 0,2 dB rect 1,73 0,12 dB 1 0,12 dB 0,01
c
SW
SW levelling precision 0,6 dB rect 1,73 0,35 dB 1 0,35 dB 0,12
c
u (y)
Σ 0,88
i
Σu (y) 0,94
√ i
Expanded uncertainty U(y) (CAL ) k =2 1,88 dB

61000-4-3 Amend. 2 © IEC:2010 – 5 –
Table J.2 – Level setting
Symbol Uncertainty Source X U(x ) Unit Distribution Divisor u(x ) Unit c u (y) Unit u (y)
i i i i i i
CAL Calibration 1.88 dB normal k =2 2.00 0.94 dB 1 0.94 dB 0.89
Antenna location variation
AL and absorber placement 0.38 dB k = 1 1 0.38 dB 1 0.38 dB 0.14
a)
Power meter
PM 0.3 dB rect 1.73 0.17 dB 1 0.17 dB 0.03
t
PA PA rapid gain variation 0.2 dB rect 1.73 0.12 dB 1 0.12 dB 0.01
t
SW SW levelling precision 0.6 dB rect 1.73 0.35 dB 1 0.35 dB 0.12
t
SG Signal generator stability 0.13 dB rect 1.73 0.08 dB 1 0.08 dB 0.01
u (y)
Σ
i 1.20
√Σu (y)
1.10
i
Expanded uncertainty U(y) k = 2 2.19 dB

a)
If a level control of the signal generator output level based on a power meter is used, the PM enters into the
t
table, otherwise the stability and drift of the signal generator as well as the power amplifier have to be taken
into account. In this example, the power amplifier does not contribute to the uncertainty budget because it is
part of the power amplifier output control, therefore it is sufficient to consider the power meter contribution.
J.2.4 Explanation of terms
FP is a combination of calibration uncertainty, field probe unbalance (anisotropy), field probe
frequency response and temperature sensitivity. Normally this data can be obtained from the
probe data sheet and/or calibration certificate.
PM is the uncertainty of the power meter, including its sensors, taken from either the
c
manufacturer’s specification (and treated as a rectangular distribution) or a calibration
certificate (and treated as a normal distribution). If the same power meter is used for both
calibration and test, this contribution can be reduced to the repeatability and linearity of the
power meter. This approach is applied within the table.
PA is including the uncertainty derived from rapid gain variation of the power amplifier after
c
the steady status has been reached.
SW is the uncertainty derived from the discrete step size of the frequency generator and
c
software windows for level setting during the calibration process. The software window can
usually be adjusted by the test laboratory.
CAL is the expanded uncertainty associated with the calibration process.
AL is the uncertainty derived from removal and replacement of the antenna and absorbers.
Referring to ISO/IEC Guide 98-3, the antenna location variation and absorber placement are
type A contributions, that is their uncertainty can be evaluated by statistical analysis of s
...