Chris' suggestion of measuring the CM current on the cable sounds like the
simplest and the most direct method. Reducing the EMI really comes down to
reducing the CM current at your frequency of interest.
I have done measurements of type 43 and 77 ferrite material and was surprised
by how lossy it is. The R and X are about the same magnitude. I also ran
time-domain tests and they had a fairly constant impedance from 500 ps to 100
ns.
Dave Cuthbert
Micron Technology
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