We've just received EN 61000-6-3:2007 + A1:2011 which has added the ability to
test radiated emissions in either an OATS, Fully Anechoic Room (FAR) or TEM
waveguide.
What puzzled me is the limits for the FAR @ 3m:
30MHz ~ 230MHz: 42 to 35dBuV decreasing linearly with the log of the
frequency
230MHz ~ 1GHz: 42dBuV
Checking a draft version of CISPR 32 also shows these same limits for an FAR.
These limits are lower than those for an OATS at 3m. Does anyone know why the
limits are lower and of a different characteristic? I'm guessing something to
do with the lack of reflective ground plane in the FAR.
Does anyone have any further information?
Many thanks
James
~~~~~~~~~~~~~~~~~~~~~
James Pawson
Leading Hardware Engineer - EMC
EchoStar Europe
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