CISPR 11:2015/AMD2:2019

CISPR 11 ®
Edition 6.0 2019-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
INT ERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
C OMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES

AMENDMENT 2
AMENDEMENT 2
Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement

Appareils industriels, scientifiques et médicaux – Caractéristiques de
perturbations radioélectriques – Limites et méthodes de mesure

CISPR 11:2015-06/AMD2:2019-01(en-fr)

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CISPR 11 ®
Edition 6.0 2019-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
INT ERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE

C OMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES

AMENDMENT 2
AMENDEMENT 2
Industrial, scientific and medical equipment – Radio-frequency disturbance

characteristics – Limits and methods of measurement

Appareils industriels, scientifiques et médicaux – Caractéristiques de

perturbations radioélectriques – Limites et méthodes de mesure

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.100.10 ISBN 978-2-8322-6379-2

– 2 – CISPR 11:2015/AMD2:2019 © IEC 2019
FOREWORD
This amendment 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.
The text of this amendment is based on the following documents:
FDIS Report on voting
CIS/B/715A/FDIS CIS/B/719/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 website under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
_____________
Introduction to the amendment
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, but only with the
traditional 2 final frequencies (one in the range 1 GHz to 2.4 GHz and one in the range
2,5 GHz to 18 GHz).
The number of final frequencies to be measured should be aligned for both weighting
functions.
b) During practical measurements cases have been observed, where the critical frequency
changed between preliminary and final measurement by more than 5 MHz. The range of
10 MHz for weighted measurements (±5 MHz from highest peak emission) seems
therefore not always to be sufficient.
An extension of this frequency range seems advisable and could increase the repeatability.
In the range 11,7 to 12,7 GHz, an EUT fails immediately if one peak exceeds the limit of
73 dB[µV/m]. Observations on a big number of different microwave ovens have shown that
during the final measurement (at least 2 min) such peaks may occur very seldom, and with a
very short duration, and an estimated overall duration of less than 1 % of the measuring time.
A state-of-the-art digital communication service should be able to tolerate such peaks.
Meanwhile, in countries where broadcasting systems, which are already standardized and
widely spread and is difficult to avoid disturbance by such peaks, are under operation,
additional limits could be separately introduced as necessary.
c) The repeatability of the peak measurement on microwave ovens is poor. Moreover, the
sheer height of the highest peak emission, without information on its duration and
repetition rate, provides very limited information on the real disturbance potential.
Measurements with both of the weighting methods have a significantly better repeatability and
should, by their physical nature, give a better judgement for the disturbing potential of the
EUT on digital radio services.
d) The conditions for preliminary and final measurements became ambiguous in Edition 6.0
(CISPR 11:2015), particularly regarding the required test time. Furthermore, it has been
found that, in some cases, a duration of 20 s for the preliminary peak measurement may
not be enough. To further increase the repeatability, WG1 decided not to divide the peak
measurements anymore into preliminary and final measurements, but to require a 2-
minute max hold peak measurement at every azimuth.
CISPR SC/B WG1 agreed to present the following proposals to the National Committees:
1) Define the same 7 final frequency ranges for the APD method as already defined for the
LogAV method (detector).
2) Extend the frequency range for the final weighted measurement to 20 MHz.
For the APD method this would mean to measure on 5 final frequencies, the critical frequency
itself, +/− 5 MHz and +/− 10 MHz.
For the LogAV detector, the requirement remains to perform for the final measurements at
least 5 consecutive sweeps in max hold mode. The test time increases accordingly, and
coverage of the fluctuations is the same as before.

– 4 – CISPR 11:2015/AMD2:2019 © IEC 2019
3) Change the peak limit in Table 13 to a constant value of 70 dB[µV/m] throughout the
frequency range and replace the requirement of a final peak measurement in the range
11,7 GHz to 12,7 GHz by a requirement of an additional weighted measurement at the
frequency of the highest peak emission in this range. This may lead to a maximum of
8 final weighted measurements.
4) Discard the distinction between preliminary and final peak measurements and make
instead the peak measurements on all azimuths for 2 minutes.

3 Terms and definitions
Add, after the existing definition 3.22 in CISPR 11:2015/AMD1:2016, the following new term
and definition:
3.23
power conversion equipment
electrical device converting one form of electrical power to another form of electrical power
with respect to voltage, current, frequency, phase and the number of phases
[SOURCE: IEC 62920:2017 3.3]
6.2.1.1 General
Replace the last paragraph by the following new paragraph:
The limits for the LV d.c. power ports specified hereafter apply only to the following types of
equipment:
a) power conversion equipment intended for assembly into photovoltaic power generating
systems;
b) grid connected power converters (GCPCs) intended for assembly into energy storage
systems.
6.2.1.3 Frequency range 150 kHz to 30 MHz
Add the following new paragraph and the new Table 19 after Table 5:
For measurements at LV d.c. power ports, the applicability criteria in accordance with
Table 19 apply.
– 6 – CISPR 11:2015/AMD2:2019 © IEC 2019
Table 19 – Applicability of measurements at d.c. power ports
Cable length L Class B group 1 equipment Class A group 1 equipment
L < 3 m No measurements are required No measurement are required
For measurements, the limits in Table 5 For measurements, the limits in Table 3
a)
apply apply
The frequency range for measurement starts The frequency range for measurement starts
3 m ≤ L < 30 m
at a frequency equal to: at a frequency equal to:
f(MHz) = 60/L f(MHz) = 60/L
For measurements, the limits in Table 5 For measurements, the limits in Table 3
L ≥ 30 m
a)
apply apply
L: maximum length of a cable (in metres) connected to an LV d.c. power port, and provided with the product or
as specified by manufacturer. Where no maximum cable length is specified, L shall be considered as longer
than 30 m.
This table applies unless specific conditions
...