IEC 62333-2:2006/AMD1:2015

IEC 62333-2 ®
Edition 1.0 2015-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
A MENDMENT 1
AM ENDEMENT 1
Noise suppression sheet for digital devices and equipment –
Part 2: Measuring methods
Plaque réduisant le bruit des dispositifs et appareils numériques –
Partie 2: Méthodes de mesure
IEC 62333-2:2006-05/AMD1:2015-08(en-fr)

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IEC 62333-2 ®
Edition 1.0 2015-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
A MENDMENT 1
AM ENDEMENT 1
Noise suppression sheet for digital devices and equipment –

Part 2: Measuring methods
Plaque réduisant le bruit des dispositifs et appareils numériques –

Partie 2: Méthodes de mesure
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.100.10 ISBN 978-2-8322-2802-9

– 2 – IEC 62333-2:2006/AMD1:2015
© IEC 2015
FOREWORD
This amendment has been prepared by IEC technical committee 51: Magnetic components
and ferrite materials.
The text of this amendment is based on the following documents:
CDV Report on voting
51/1068/CDV 51/1088/RVC
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• withdrawn,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.
_____________
4 Measuring methods
Add, after 4.4, the following new subclause, new tables and new figures:
4.5 Line-decoupling ratio: R
dl
4.5.1 General
This standard has provided for the measuring method of
① the intra-decoupling ratio (R ),
da
② the inter-decoupling ratio (R ),
de
③ the transmission attenuation power ratio (R ) and
tp
④ the radiation suppression ratio (R ) in 4.1 to 4.4.
rs
Subclause 4.5 provides
⑤ the line-decoupling ratio (R ).
dl
The diagrammatic illustration of each noise suppression effect is shown in the following
Table 9 and Figure 17.
© IEC 2015
Table 9 – Noise suppression effect classified as noise path and NSS position
Victim Near field coupling Conduction Radiation
Part (component) Line
Line Far
plane field
Same Opposite Line in
Agressor side side vicinity
① ② ⑤
Part
Intra- Inter- Line
(component)
③ ④
decoupling decoupling decoupling
Transmission Radiation
⑤
attenuation suppression
Line
⑥ Line ⑦
decoupling
Chassis
Cable, FPC ④
⑤
③
③
PCB
Victim
Aggressor
(part)
⑥
②
⑤ Line
⑦
①
Aggressor
Victim
decoupling
Victim Aggressor
PCB
(line) (line)
IEC
Figure 17 – Noise path
4.5.2 Principle
The following method is applied to evaluate the reduction of coupling between a line and (a)
part(s) on both sides of the NSS, from 100 MHz to 6 GHz.
A test fixture for this evaluation is constructed with a micro-strip line (MSL) and a magnetic
loop antenna as shown in Figure 18. The test fixture is aimed to simulate an electromagnetic
interference observed frequently in electronic equipments. The MSL and the antenna
correspond to a noise source, the aggressor, and a receiver, the victim, respectively.
The antenna and the NSS are set up at the centre of the MSL as shown in Figure 19. Two
coupling factors of the loop antenna to the MSL with the NSS and without the NSS are
measured in dB. The line-decoupling ratio R is given in terms of dB as the difference of the
dl
two factors.
Permeability of the NSS modifies the magnetic field in its vicinity which can be applied to
reduce noise coupling between the MSL and the antenna. At the high frequency range where
the imaginary part of the permeability is dominant, the noise can be effectively absorbed due
to the magnetic loss of the NSS.

– 4 – IEC 62333-2:2006/AMD1:2015
© IEC 2015
Network
analyzer
Receiver
(victim)
Loop
Magnetic
antenna
flux
•
Micro-strip
Noise source RF ⊗
line
(aggressor) current
IEC
Figure 18 – A test fixture for line decoupling measurement
4.5.3 Apparatus
Figure 19 shows the schematic diagram of the measurement set-up for the line-decoupling
ratio.
Bottom centre
of loop
Lift off h = 2
Elevation θ
Offset S = 3
Azimuth θ
IEC
Key
h is the lift off between the lower edge of the loop antenna and the surface of the MSL substrate,
θ is the elevation angle of the loop antenna surface from the horizontal plane,
θ is the azimuth angle of the loop antenna and transverse direction of the MSL,
S is the centre offset of the loop antenna and the MSL.
Figure 19 – Schematic diagram of MSL and loop antenna set-up
4.5.3.1 Loop antenna
A small loop antenna defined in 4.1.2.1 shall be used.
4.5.3.2 Micro-strip line
The dimensions of the micro-strip line are shown in Table 10. One end of the MSL shall be
connected to the network analyzer via an SMA type connector, and the other end of the MSL

© IEC 2015
shall be connected to termination load of 50 Ω via an SMA type connector. The VSWR of the
MSL terminated with the other end shall be smaller than 1,2.
Table 10 – Dimensions of the MSL
Length Width Thickness Material
mm mm mm
b
Substrate 100 ± 0,8 50 ± 0,8 1,6 PTFE/Glass
a
Strip conductor Cu
100 ± 0,15 4,4 ± 0,05 0,018
a
Typically, but in any case < 21 µm.
b
ε = 2,2 to 2,6.
r
The antenna MSL and NSS configuration are shown in Figure 20. The dimensions of the loop
antenna are specified as shown in Table 11.
Offset S
Magnetic
Antenna φ
flux
a
NSS
RF
current
IEC
Key
φ is the average diameter of the loop antenna.
a
Figure 20 – NSS, loop antenna and magnetic flux configuration
Table 11 – Dimensions of loop antenna
Lift off h Angle θ Angle θ Offset S
Diameter φ
1 2
a
mm mm radian radian mm
a b
2,0 ± 0,2 3,0 ± 0,2 ≤ π/18 ≤ π/2 3,0±0,2
a
≤ 10°
b
≤ 90°
The frequency response required between the loop antenna and the MSL shall be in
accordance with 4.1.2.1, however, the antenna and the MSL are within a fixed position as
shown in Figure 18.
4.5.3.3 Network analyzer
A vector network analyzer shall be operated in accordance with 4.1.2.2.
4.5.4 Test sample
4.5.4.1 Dimension
The dimensions of the test sample for measuring R are shown in Table 12.
dl
h
– 6 – IEC 62333-2:2006/AMD1:2015
© IEC 2015
Table 12 – Dimensions of the test sample
Length L Width W
mm mm
20±0,5 ≥ 20
NOTE Any thickness of the test sample can be used in this measurement (provided the condition h = (2,0±0,2)
mm is maintained) as the thickness of the test sample depends on the sample formation.
The measurement is not sensitive to the maximum width of the test sample.

4.5.4.2 Attachment method on the test fixture
The test sample should be put and fixed as shown in 4.3.4.2.
4.5.5 Procedure
The arrangements of the antenna, MSL and test sample are shown in Tables 10 to 12, and
also Figures 19 and 20.
4.5.5.1 Measurement system set-up
The measurement apparatus and the test sample(s) should be prepared in accordance with
4.5.3 and 4.5.4 in advance. A calibration of the network analyzer should be done at the end of
the connectors of coaxial cables connected to the test fixture. Connect one connector to the
MSL, and the other connector to the antenna.
4.5.5.2 Reference measurement
Measure the S data as a reference, S .
21 21R
4.5.5.3 Test sample measurement
The test sample should be placed on the test fixture in accordance with 4.5.4. Measure the
S data as a sample characteristic. The measured value is then called S .
21 21M
4.5.5.4 Calculation of R
dl
R shall be calculated by using the following formula:
dl
R = S – S [dB]
dl 21R 21M
where
S is the transmission characteristics (S ) without the test sample.
21R 21
S is the transmission characteristics (S ) with the test sample.
21M 21
4.5.6 Expression of results
The following items shall be expressed.
a) R ;
dl
b) attachment condition of the test sample;
c) thickness of the test sample.

_____________
– 8 – IEC 62333-2:2006/AMD1:2015
© IEC 2015
AVANT-PROPOS
Le présent amendement a été établi par le comité d'études 51 de l'IEC: Composants
magnétiques et ferrites.
Le texte de cet amendement est issu des documents suivants:
CDV Ra
...