This approach compels good practice; some radiated susceptibility tests
approach oven level at peak power.
Cortland
KA5S
----- Original Message -----
From: Haynes, Tim (SELEX GALILEO, UK)
<mailto:tim.hay...@selexgalileo.com>
To: emc-p...@ieee.org
Sent: 1/15/2009 4:00:40 AM
Subject: RE: Anechoic chambers: risks of energy leaking out
... An alternative view, would be to treat the fixed installation (the
EMC
Facility) and apply the limits of a well known EN for radiated emissions - at
10m from the screened room. If you have 10V/m in the screened room at 3m from
the antenna, that is 140dBuV/m at 3m, then it is easy to calculate the level
at, say, 16 or 20m from the antenna. The minimum screening that this approach
would give would be, say 140 - 20log(20m/3m)-37dBuV (for frequencies above
230MHz) = 140 - 16.5 -37 = 86.5dB. Below 230MHz, on the same basis, 93.5dB
attenuation would be required.
-
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