CISPR 16-1-4:2007/AMD1:2007

Amendment 1 - Specification for radio disturbance and immunity measuring apparatus and methods - Part 1-4: Radio disturbance and immunity measuring apparatus - Ancillary equipment - Radiated disturbances

Amendement 1 - 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 - Matériels auxiliaires - Perturbations rayonnées

General Information

• Status: Published
• Publication Date: 15-Oct-2007
• ICS: 33.100.10 - Emission
• ICS: 33.100.20 - Immunity
• Technical Committee: CIS/A - Radio-interference measurements and statistical methods
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 27-Apr-2010

Relations

• Amends: CISPR 16-1-4:2007 - Specification for radio disturbance and immunity measuring apparatus and methods - Part 1-4: Radio disturbance and immunity measuring apparatus - Ancillary equipment - Radiated disturbances
• Effective Date: 05-Sep-2023
• Revised: 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
• Effective Date: 05-Sep-2023

Standards Content (Sample)

CISPR 16-1-4
Edition 2.0 2007-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
COMITÉ 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 – Ancillary
equipment – Radiated disturbances
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 – Matériels auxiliaires –
Perturbations rayonnées
CISPR 16-1-4 A1:2007
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CISPR 16-1-4
Edition 2.0 2007-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
COMITÉ 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 – Ancillary
equipment – Radiated disturbances

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 – Matériels auxiliaires –
Perturbations rayonnées
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
S
CODE PRIX
ICS 33.100.10; 33.100.20 ISBN 2-8318-9312-7

– 2 – CISPR 16-1-4 Amend. 1 © IEC:2007

FOREWORD
This amendment has been prepared by subcommittee A of CISPR: Radio-interference

measurements and statistical methods.

The text of this amendment is based on the following documents:

FDIS Report on voting
CISPR/A/750/FDIS CISPR/A/760/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 maintenance result 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.
_____________
INTRODUCTION
In this amendment, the use of a balanced dipole antenna (the CISPR tuned dipole) as a
physical reference for radiated emission measurements in the frequency range between
30 MHz and 300 MHz is deleted. It is replaced by the requirement that in this frequency range
the quantity to be measured is the electric field strength that can be determined using
different types of antennas, provided that the antenna factor and the associated uncertainty
are known.
This fundamental change of measurand in the frequency range between 30 MHz and 300 MHz
was subject to thorough investigations and discussion within CISPR A, and brings it into line
with the measurand that already applies in the rest of the frequency range 9 kHz to 1 GHz,
and indeed above 1 GHz. The decision for this change has been supported by the results of a
questionnaire. More details on the rationale for the decision to introduce the ‘electric field’
measurand instead of the CISPR reference dipoles can be found in the CISPR Maintenance

Cycle Report CISPR/A/541/MCR.
CISPR/A/541/MCR explains that the need for a CISPR reference dipole no longer exists, due
to improvements in the calibration of antennas used for EMC compliance testing and the
increased implementation of quality systems in test and calibration laboratories in accordance
with ISO 17025. Moreover, Clause 4 of CISPR 16-1-4 covers the frequency range 9 kHz to
1 GHz, yet a reference antenna is only specified in the range 30 MHz to 300 MHz, which
seems to make this frequency range an exception to the general rule.
In other words, most measurements of physical quantities are made with an instrument that is
traceable to national standards. There is no need for measurement of electric field strength in
the frequency range 30 MHz to 300 MHz to deviate from this, especially when application of
such a physical reference antenna may give a greater uncertainty to the intended measurand
than a regular calibrated broadband antenna. Moreover, these days, the CISPR reference
dipole is rarely used in practice because it is impractical from a operational point of view (time
consuming). The new measurand is the field strength as defined by the limit level in dBμV/m

CISPR 16-1-4 Amend. 1 © IEC:2007 – 3 –

and as required by the method of measurement. If various operators follow the same

measurement method, involving calibrated antennas, a high degree of reproducibility is

ensured.
A consequence of using the tuned dipole antenna as a reference is that the antenna

uncertainties in CISPR 16-4-2 require the field strength measured by a broadband antenna to

be referred to the field strength that would have been measured had a tuned dipole been

used. The ramifications would be dependent on the difference in radiation patterns and

mutual coupling of a dipole compared to a broadband antenna (including height dependence

of antenna factor). This practice can actually result in larger EMC measurement uncertainties
than if the field strength were derived from the traceably calibrated broadband antenna. The

relating of the behaviour of the commonly used broadband antenna to the extremely rarely

used tuned dipole in the notes to the uncertainty budget in CISPR 16-4-2, requires specialist
knowledge to understand.
Page 3
CONTENTS
Add, on page 5, to the list of tables the titles of the new figures as follows:
Figure 20 – Schematic of radiation from EUT reaching an LPDA antenna directly and via
ground reflections on a 3 m site, showing the half beamwidth, ϕ, at the reflected ray
Figure 21 – Definition of the reference planes inside the test jig
Figure 22 – Example of a 50 Ω adaptor construction in the vertical flange of the jig
Figure 23 – Example of a matching adaptor with balun or transformer
Figure 24 – Example of a matching adaptor with resistive matching network
Figure 25 – The four configurations for the TRL calibration

Page 15
3 Terms and definitions
3.5
antenna
Replace the existing Note 2 by the following new note:
NOTE 2 This term covers various devices such as the wire antenna, free-space-resonant dipole and hybrid
antenna.
3.8
site attenuation
Replace, on page 17, the existing text with the following:
Site attenuation is defined as the minimum site insertion loss measured between two
polarization-matched antennas located on a test site when one antenna is moved vertically
over a specified height range and the other is set at a fixed height.

– 4 – CISPR 16-1-4 Amend. 1 © IEC:2007

3.9
test antenna
Delete the existing definition 3.9, and replace it with the following new definition of site

insertion loss:
3.9
site insertion loss
the loss between a pair of antennas placed at specified positions on a test site, when a direct

electrical connection between the generator output and receiver input is replaced by

transmitting and receiving antennas placed at the specified positions

3.12
quasi-free space test-site
Replace the existing wording of this definition with the following:
facility for radiated emission measurements, or antenna calibration, that is intended to
achieve free-space conditions. Unwanted reflections from the surroundings are kept to a
minimum in order to satisfy the site acceptance criterion applicable to the radiated emission
measurement or antenna calibration procedure being considered
Add, after definition 3.13, the following new definitions:
3.14
cross-polar response
measure of the rejection by the antenna of the cross-polarised field, when the antenna is
rotated in a uniform electromagnetic field
3.15
hybrid antenna
conventional wire-element log-periodic dipole array (LPDA) antenna with boom lengthened at
the open-circuit end to add one broadband dipole (e.g., biconical or bow-tie), such that the
infinite balun (boom) of the LPDA serves as a voltage source for the broadband dipole.
Typically a common-mode choke is used at this end of the boom to minimize parasitic
(unintended) RF currents on the outer conductor of the coaxial cable flowing into the receiver
3.16
low uncertainty antenna
good quality robust biconical or LPDA antenna, whose antenna factor is reproducible to better
than ±0,5 dB, used for the measurement of E-field strength at a defined point in space
NOTE It is further described in A.2.2.

3.17
semi-anechoic chamber
SAC
shielded enclosure, in which five of the six internal surfaces are lined with radio-frequency-
energy absorbing material (i.e., RF absorber), which absorbs electromagnetic energy in the
frequency range of interest, and the bottom horizontal surface is a conducting ground plane
for use with OATS test set-ups
3.18
common mode absorption device
CMAD
a device that may be applied on cables leaving the test volume in radiated emission
measurements to reduce the compliance uncertainty

CISPR 16-1-4 Amend. 1 © IEC:2007 – 5 –

3.19
insertion loss
the loss arising from the insertion of a device into a transmission line, expressed as the ratio

of voltages immediately before and after the point of insertion of a device under test, before

and after the insertion. It is equal to the inverse of the transmission S-parameter, |1/S |
3.20
reflection coefficient
the ratio of a common quantity to both the reflected and incident travelling waves. Hence, the

voltage reflection coefficient is defined as the ratio of the complex voltage of the reflected

wave to the complex voltage of the incident wave. The voltage reflection coeffici
...