Austin EMC uses a Panashield solid
shielded room with all six internal surfaces being reflective
(no anechoic absorbers) to house the DUT, antenna, and a mode stirrer.
A complex shape stirrer homogenizes the room resonance's and
signal polarities. The stirrer turns linearly at four RPM.
This configuration is used for quick radiated pre-scan and radiated
immunity operations.
The advantages of utilizing the shielded room this way are as follows:
1. No significant ambient signals to mask DUT radiations.
2. Increased RF sensitivity due to capture of signal in all directions.
3. Practically no sensitivity to antenna placement, polarity, height, DUT
placement or cable placement.
4. Decreased initial testing time due to conditions listed in 3 above.
In the case of performing a Verification, radiated signals approaching
the limit are subsequently measured on the open field test range.
Any differences are used to improve chamber correlation.
Stirrer in corner