EMC anechoic chambers: a shielded, reflection-free room for radiated tests.
An EMC chamber does two jobs at once: its metal shell keeps outside radio signals out, and its absorber lining stops the inside walls from reflecting.
Shielding and absorber
The shell is built from modular metal panels. How well it keeps signals out is expressed as shielding effectiveness, measured in decibels across the frequency range; doors, filters and vents are designed to the same level as the panels.
Inside, the absorber lining controls reflections. Ferrite tiles work at the low end of the frequency range, pyramidal foam absorber at the high end; many chambers combine both as a hybrid lining.
Chamber types
- Semi-anechoic chamber (SAC): reflective metal floor, absorber on walls and ceiling, for radiated emissions and immunity
- Fully anechoic chamber (FAC or FAR): absorber on all six surfaces, for immunity, some emission methods and antenna work
- CISPR 25 chambers for automotive components, with a ground-plane bench
- Chambers for avionics, railway, industrial and medical equipment, sized to the products and standards
Sizes
EMC chambers are described by the measurement distance between antenna and product: 1 m, 3 m, 5 m or 10 m. The distance comes from the standards you test to; the room size follows from the distance, the antenna height scan, the turntable and the largest product.
What comes with a chamber
- Shielded door, power and signal filters, penetration panels and honeycomb vents
- Turntable and antenna mast with remote control
- Lighting, ventilation and camera monitoring designed not to disturb the measurement
- Control room and amplifier room as shielded rooms next to the chamber
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