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EMC qualification |
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The electromagnetic environment is composed of natural sources (solar ray, electric charge in atmosphere – storm, common magmatic) and of artificial sources: voluntary transmitter of radiofrequency waves, and involuntary transmitter with interference phenomenon link to every electrical device in use.
In sectors where electromagnetic constraints are important and/or when safety equipment are concerned, requirements specified are incomparably high than in a regulation context like CE marking : see EMC labs (certification).
At the end of an electromagnetic specification, it can be set if the equipment is compatible or not with its electromagnetic environment. We talk about electromagnetic compatibility test.
EMC tests define :
- the radiated and conducted electromagnetic emission of an equipment (electrical field, magnetic field)
- the capacity to work properly even in presence of disturbances: radiated immunity, conducted immunity, transient, lightning, electrostatic discharge,….
By extension, EMC test covers all or part of emission or immunity tests and the many related electrical tests: voltage dips and fluctuation, harmonics and flickers measurements.
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The context of emc qualification test |
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The first electromagnetic compatibility requirements have concern warship where many detection system (radar), communication system (RF transmitter) and electronics system on board have to work alongside.
Taking into account intensive radiofrequency field in ship containing ammunitions and fuel, leads to the development of the first EMC standards by the U.S. army (MIL STD standard).
EMC military specifications have now french (GAM EG 13), british ( DEF-STAN) or NATO (STANAG) standards.
These standards have spread over other sensitive sectors : civil aeronautics (RTCA-DO standard), automotive, space industry.
Equipment’s subjected to specification are generally concerned by climatic and mechanical environments.
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Standards and specifications treated* |
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Standards
RTCA DO 160
MIL STD 461/462
MIL STD 704
MIL STD 202, 810, 883
MIL DTL 3839
CISPR 25
ISO 7637
ISO 11452
ISO DTR 10605
GAM EG 13
DEF-STAN
Directives 2004/104/EC,
95/54/EC, 97/24/EC
ISO 14892
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Specifications
Scorpene, Barracuda, Fremm,
Eurocopter, Rafale,
Airbus, Boeing, Bombardier,
PSA, Renault, Nissan, General Motors, Ford ,
Ariane, Astra, Hylas, Alphabus, Coms, Pleïades,
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*Non exhaustive list, please contact us for more information |
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Mode stirred reverberation chamber |
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System room |
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Instrumentation |
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Part of these instrumentation is common with our EMC labs dedicated to regulation.
- 15 from the 37 shielded rooms of Emitech Group can be used for EMC specification, 4 of them are "system shielded room", it means they could receive equipment with bulk size and big weight (car, armored vehicle, shelter,...).
- 4 mode stirred reverberation chambers.
- Emission DC - 40 GHz
One test line by room
- Clamp current probes: 10 Hz - 1GHz (maximum 1 kA),
- Magnetic loop antennas : 20 Hz - 30 MHz,
- Electric field antennas : 10 kHz - 40 GHz,
- Temporal analysis : DC - 500 MHz
- Immunity from 10 kHz to 40 GHz - HIRF
One immunity test line by room
- Electric field : 10 kHz - 40 GHz
- up to 3000 V/m in CW
- up to 8000 V/m pulsed
- Magnetic field : 10 Hz - 150 KHz,
- BCI : up to 1 Ampère from 10 kHz to 1 GHz,
- AM, FM, pulsed and combined modulations.
- Lightning
- Amplifiers, transformers, inductors according to :
- RTCA DO 160C/D
- AC-20-136
- ABD 0100.1.2
- Multiple Stroke & Multiple Burst according to the following waveforms:
- WF 1 or 4 : 6,4/70 µs
- WF 5B : 50/500 µs
- WF 5A : 40/120 µs
- WF 2 : 0,1/6,4 µs
- WF 3 : 1 MHz et 10 MHz
- WF 6 : 0,244/4 µs
- up to level 5 of DO 160
- Electrical tests
- Transient surges according to
ISO 7637, RTCA DO160,
ABD 0100.1.8, AMD 24C
- Voltage subtransients and specific waveform by direct injection or by coupling,
- Power supply interruptions,
- Audio immunity on power supply,
- Tests under direct or alternating current from 50 Hz to 800 Hz (bench 30 kVA according to AIRBUS, BOEING, DO 160D specifications section 16)
- Electrostatic discharge - ESD
- Up to 30 kV
- Standards and automotive and aeronautic specifications
(C = 150 pF, 330 pF, 500 pF, ...
R = 330 ohms, 2000 ohms, 500 ohms, 5000 ohms, ...)
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Related links |
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Civil aviation and space |
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| Benefit from a single contact for your qualifications. |
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Intra and inter company courses |
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| More than half of our training concerns EMC and further subjects: regulation, measuring, design, quality,... |
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Training