CISPR 16-1-4:2019/AMD1:2020

CISPR 16-1-4 ®
Edition 4.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
INT ERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
C OMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES

AMENDMENT 1
AMENDEMENT 1
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
Spécifications des méthodes et des appareils de mesure des perturbations
radioélectriques et de l'immunité aux perturbations radioélectriques –
Partie 1-4: Appareils de mesure des perturbations radioélectriques et de
l'immunité aux perturbations radioélectriques – Antennes et emplacements
d'essai pour les mesures des perturbations rayonnées

CISPR 16-1-4:2019-01/AMD1:2020-06(en-fr)

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CISPR 16-1-4 ®
Edition 4.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
INT ERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE

C OMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES

AMENDMENT 1
AMENDEMENT 1
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

Spécifications des méthodes et des appareils de mesure des perturbations

radioélectriques et de l'immunité aux perturbations radioélectriques –

Partie 1-4: Appareils de mesure des perturbations radioélectriques et de

l'immunité aux perturbations radioélectriques – Antennes et emplacements

d'essai pour les mesures des perturbations rayonnées

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.100.10; 33.100.20 ISBN 978-2-8322-8450-6

– 2 – CISPR 16-1-4:2019/AMD1:2020
© IEC 2020
FOREWORD
This amendment has been prepared by subcommittee CISPR A: Radio-interference
measurements and statistical methods, of IEC technical committee CISPR: International special
committee on radio interference.
The text of this amendment is based on the following documents:
FDIS Report on voting
CIS/A/1316/FDIS CIS/A/1320/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.
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.

_____________
3.2 Abbreviated terms
Add the following new abbreviated terms to the existing list:
DRH double ridged horn
XP cross polarization
PDF probability density function

4.5.5 Cross-polar response of antenna
Delete, in the first sentence of the existing last paragraph, the cross-reference to [21].

© IEC 2020
4.7 Special antenna arrangements – large-loop antenna system
Replace the first sentence of the third paragraph with the following new sentence:
The EUT shall be positioned in the centre of the LLAS on a non-conductive support table.

Replace the third sentence of the third paragraph with the following new sentence:
Guidelines for routing of EUT cables are given in C.3 and Figure C.6.

Add, after the existing third paragraph, the following new paragraph:
The LLAS may be placed in any environment. Placement inside a shielded room, SAC, FAR, or
weather-protected OATS is permitted. Placement in a shielded environment is recommended
to eliminate ambient signals allowing for better sensitivity to EUT emissions. A minimum
distance of 0,5 m between the LLAS and any metallic plane is recommended. The validation of
the LLAS shall be performed at the location where the LLAS measurements normally take place
to take into account the effect of the environment (see C.4).

Replace, in the NOTE, "Correction factors" with "Conversion factors".

C.3 Construction of a large-loop antenna (LLA)
Replace the existing third paragraph with the following paragraph:
The standard diameter of each LLA is defined as D = 2 m (i.e. the reference diameter). If
necessary, e.g. in the case of a large EUT, D may be increased. However, in the frequency
range up to 30 MHz, the maximum diameter allowed is 4 m. Further increase of the diameter
can result in non-reproducible resonances of the LLAS response at the high-frequency end of
the measuring range. The validation method specified in C.4 applies for LLAS loops with
diameters of 2 m, 3 m, or 4 m.

Replace the second sentence of the seventh paragraph "The insertion loss of the current probe
shall be sufficiently low (see NOTE 1)." with "The insertion impedance of the current probe
should be sufficiently low (see NOTE)."
Delete the existing NOTE 1 and NOTE 2.

– 4 – CISPR 16-1-4:2019/AMD1:2020
© IEC 2020
Add, between the seventh and eighth paragraphs, the following new NOTE:
NOTE To obtain a flat frequency response for each LLA at the lower end of the 9 kHz to 30 MHz frequency range,
the resistive part of the insertion impedance, R , of the current probe is designed to be much smaller than 2π f L at
c c
f = 9 kHz, where L represents the inductance of the current probe. In addition, R + R is to be less than or equal to
c c i
X /10 = (2π f L)/10 at 9 kHz, where R is the resistance of the inner conductor of the loop and L is the loop inductance.
i i
This inductance is about 1,5 µH/m along the circumference; thus, for each standard LLA whose diameter is 2 m,
X ≈ 0,5 Ω at f = 9 kHz.
i
Add, at the end of the existing text (before Figure C.1), the following new paragraph:
To avoid unwanted capacitive coupling between the EUT and the LLAS, the distance between
the EUT and components of the LLAS shall be at least 0,10 times the loop diameter. Particular
attention should be paid to the leads of an EUT. Cables shall be routed together and leave the
test volume in the same octant of the LLAS, no closer than 0,4 m to any of the LLAS loops (see
Figure C.6).
C.4 Validation of an LLA
Replace the existing title of this clause with the following new title:
C.4 Validation of the LLAS
Replace the first paragraph of this clause with the following three new paragraphs:
The validation of the LLAS shall be carried out by measuring the current induced in each of the
three LLAs by means of the LLAS verification dipole connected to a 50 Ω RF generator, as
described in C.5. The magnetic field emitted by the dipole allows verification of the magnetic
field sensitivity of the LLAS. The electric field emitted by the LLAS verification dipole is intended
to verify that the electric field sensitivity of the LLAS is sufficiently low.
The validation of an LLAS shall be performed at the site where the LLAS measurements
normally take place. This is to account for the effect of the floor, walls, and similar objects or
surfaces in the specific environment of the LLAS.
Validation measurements shall be performed at least at the following frequencies: 9 kHz,
100 kHz, 1 MHz, 2 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz, 25 MHz, and 30 MHz.

Replace the existing second and third paragraphs with the following new paragraphs:
The induced current shall be measured as a function of frequency in the range of 9 kHz to
30 MHz at the eight positions of the LLAS verification dipole shown in Figure C.7. During this
measurement, the LLAS verification dipole shall be in the plane of the LLA under test.
In each of the eight positions, the measured validation factor, expressed in dB(Ω) as
20 lg(V /I ), where V is the open circuit voltage of the RF generator and I is the measured
go I go I
current, shall not deviate by more than ±3 dB from the applicable reference validation factor
given in Figure C.8 and Table C.1.

© IEC 2020
Delete the existing fourth paragraph.

Add, before Figure C.7, three new paragraphs as follows:
The reference validation factors given in Figure C.8 and Table C.1 are valid for an LLAS with
circular loops having diameters of D = 2 m, 3 m, or 4 m.
Tabular values of the curves presented in Figure C.8 are given in Table C.1. These tabular
values shall be used for the LLAS validation.
Background material and the equations for calculating the reference validation factors are given
in CISPR TR 16-3:2020 [23].
Figure C.7 – The eight positions of the LLAS verification dipole during validation of an
LLA
Replace the existing figure with the following new figure:

Figure C.7 – The eight positions of the LLAS verification
dipole during validation of an LLA

– 6 – CISPR 16-1-4:2019/AMD1:2020
© IEC 2020
Figure C.8 – Validation factor for an LLA of 2 m diameter
Replace the existing figure, including its title, with the following new figure:

Figure C.8 – Reference validation factors for
...