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![Page 1: How to perform conducted immunity measurements according ... · How to perform conducted immunity measurements according to 61000-4-6 and how to validate the setup ... 1.2 Interpretation](https://reader033.fdocuments.in/reader033/viewer/2022051602/5ae4d3137f8b9a495c8f0f60/html5/thumbnails/1.jpg)
How to perform conducted immunity measurements
according to 61000-4-6 and how to validate the setup
Frédéric Pythoud, Emrah Tas EMC Europe 2016
(5. to 9. of September)
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Agenda
1. Introduction on electromagnetic fields
2. Principles of conducted immunity testing
3. The setup and important issues
4. Validating with the METAS Round-Robin test device
5. Conclusion
09/09/2016 METAS 2
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09/09/2016 METAS 3
1.1 Maxwell’s equations
Faraday’s induction law
Ampere-Maxwell law
Electrostatic law
Equation of magnetism
t
HErot
jt
EHrot
Ediv
0Hdiv
d
rr
crrtrjA
,
4
Equations
Solution
ArotH
dtjHrotEt
1
Retarded magnetic
vector potential
currents
James Clerk Maxwell (1831–1879)
distances
Time dependence
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09/09/2016 METAS 4
1.2 Interpretation
Electric currents Electromagnetic
Waves Electric currents
E
H
i1
i2
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09/09/2016 METAS 5
Immunity testing is important.
2.1 Immunity testing
The mobile phone might disturb
an electric/electronic equipment Disturbance
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09/09/2016 METAS 6
2.2 Coupling mechanisms of em-waves
Shield
control
cable
currents
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09/09/2016 METAS 7
2.3 Coupling to the enclosure and to cables
Coupling mostly of short
wavelength
(wavelength < 3 m)
Frequency > 80 MHz
Coupling mostly longer wavelength
(wavelength > 3 m)
Frequency < 80 MHz
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09/09/2016 METAS 8
Fields are produced by antennas:
For small wavelength (< 3 m), small antennas (< 3 m)
For large wavelengths (> 3 m), large antennas (> 3m)
2.4 How fields are produced
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09/09/2016 METAS 9
2.5 Basic idea of conducted immunity testing
Inject the current
directly on the cables
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09/09/2016 METAS 10
Coupling-Decoupling Networks
EM-clamps
Current probes
Direct injection (on shield)
2.6 Devices to inject current on the cables
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09/09/2016 METAS 11
3.1 The experimental setup
Equipment
Under
Test AE AE
AE
AE
Decoupling
Decoupling
Decoupling
Decoupling 150 Ω
Generator
A current has to flow
through the EUT
Isolation
IEC 61000-4-6 Standard
“ Testing and measurement techniques –
immunity to conducted disturbances,
induced by radio-frequency fields”
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09/09/2016 METAS 12
Adapted coupling
Adapted decoupling
Signal level calibration
Correct parameters on generator
Amplifier not in compression
Correct isolation
3.2 Important points
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09/09/2016 METAS 13
3.3 Possible source of errors illustrated
Equipment
Under
Test AE AE
AE
AE
Decoupling
Decoupling
Decoupling
Decoupling 150 Ω
Generator
Isolation
• Correct level setting
• No compression
• Correct parameters
80% Modulation
• Proper coupling
• and decoupling
• Correct cable
length
• Proper coupling
• and decoupling
• Decoupling only
• Proper isolation
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09/09/2016 METAS 14
Special developed «EUT» to be tested
4.1 Checking the testing capabilities with a round robin test device
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09/09/2016 METAS 15
Recording of the current on all interfaces during testing
Information is stored on a Micro SD card in CSV file format
Data logs are evaluated with Mathematica /MATLAB
The device can also simulate errors (red light in front)
4.2 Typical capabilities of test device
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09/09/2016 METAS 16
7 signal channels used for current level measurements
Special current clamp for frequency counting
Data logging and frequency information with Arduino boards
4.3 Device Architecture and Characteristics
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09/09/2016 METAS 17
4.4 The device is useful for identifying incorrect testing
Open Circuit
No 150 Ω
Outstanding overview of the device in the
EMC Europe 2016 presentation / proceedings:
“Proficiency Testing for Conducted Immunity with a new Round Robin Test Device”
Emrah Tas et al.
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09/09/2016 METAS 18
Conducted immunity testing according to
IEC 61000-4-6 is not straightforward.
It requires:
• Adapted equipment
• Proper calibration
• Know-how to build up the setup
5.1 Conclusion
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09/09/2016 METAS 19
The Round Robin test device developed within the scope of
this project offers a unique way to check the testing capabilities
of the laboratory
It is useful for
• Accreditation (ISO 17025)
• Teaching purposes
• To identify faulty components
Note: ISO 17025 requires inter-laboratory testing (see clause 5.9.1. b.):
“General requirements for the competence of testing
and calibration laboratories”
5.2 Possibility to check using the round robin test device
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09/09/2016 METAS 20
METAS will provide international proficiency testing in the field
of EMC testing
Including following measurement places:
• IEC 61000-4-3
• IEC 61000-4-5
• IIEC 61000-4-6
• Radiated and conducted emissions according to CISPR 16
in the frequency range 150 kHz to 6 GHz.
Start in 2017
5.3 PT-Provider
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Thank you very much for your attention Special thanks to all project participants