One alternative is transformer(s)/transient protectors of nominal
impedance to Earth the terminating CM current, and loopback after the
terminating components. You can even add attenuation so as to drive the
cable especially hard.
Cortland Richmond
On 12/28/2011 12:03 PM, Chris Wells wrote:
James/Jim
I like the loop back test idea for preliminary EMI testing due to the
simplicity.
However another issue is that it lacks the common mode impedance
relationship at the AE end.
I suppose one could use a long enough cable to create some capacitive
relationship to the ground plane but the pulse transformer at the far
end would not be there.
Back to the AE side of this discussion:
I am having similar issues in doing some preliminary emission testing
where I was using a Cat5 to fiber optic transceiver as the AE end
(another FO/Cat5 outside the chamber to my notebook).
This approach worked well for EMI testing since the transceiver was
robust enough but I found that my transceiver was a major source of
emissions during my emission testing.
Can anyone suggest an "emission quite" FO/Cat5 transceiver that would
behave for my testing?
Thanks
Chris Wells
Eaton Corp.
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