- Posted by doEEEt Media Group
- On June 2, 2021
EMC/EMI tests are intended to ensure that no electromagnetic interference will exist between:
- the launcher and the satellite
- the satellite and the GSE
- different satellite in the same launcher
- different pieces of equipment with a given satellite
EMC tests consist of 5 kinds of tests:
- Radiated emissions: radiated emissions from the EUT are not in excess of a given level
- Radiated immunity: the EUT is immune to radiated emissions from the environment
- Conducted emission: Conducted emission is below a given level. In the case of a satellite, this refers to intra-satellite emissions, from one subsystem to another.
- Conducted immunity: a given subsystem is immune to conducted emissions from other subsystems.
- Self immunity: all subsystems working simultaneously do not produce interference with each other.
EMC tests are performed in an anechoic chamber for radiated emission/immunity (to avoid reflections) and using grounded planes (for conducted emission/immunity).
An anechoic chamber is a room designed to absorb reflections of either sound or electromagnetic waves completely. They are also often isolated from waves entering their surroundings. This combination means that a person or detector exclusively hears direct sounds (no reverberant sounds), in effect simulating being inside an infinitely large room.
EMC testing of flight model needs cleanliness level ISO 8.
ISO 8 is the least clean cleanroom classification. A cleanroom must have less than 35,200,000 particles/m3 particles > 0.5 µm and 20 HEPA filtered air changes per hour.
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