HI All,
 
I'm watching a MIL STD 461 test on a stand alone EUT. Between 10 kHz and 20
kHz we have developed a Hump in out profile that wasn't present at our last
test lab. 
 
The hump is identical looking with a current probe on the input to and from
the LISN, so I believe I'm seeing no isolation from the LISN between the EUT
and room wall filter.
 
So, I was curious if anyone has looked into the impedance of the power supply
in a room from 10 kHz to say 100 kHz? I'm thinking that my EUT and the room
filter may be interacting....
 
We have dismised other sources nearby and in the room.
 
Thoughts anyone?
 
Thanks,

Derek Walton
 
L F Research

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