Radiated Emissions Measurements in a GTEM

Radiated emissions testing is done to determine the strength of the electromagnetic fields that are unintentionally being generated by your device. Taking measurements and evaluating your DUT to radiated emissions in a GTEM cell is different than in an anechoic chamber or EMC tent.
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Did you guys have to calculate the factor to have correlation to an OATS or is the correlation factor within IEC-61000-4-20 already?