From my experience, I would seldom expect the current probe and the
LISN to show the same answer. The big difference is that the current
probe is looking at a fairly random termination impedance compared to
the "Line Impedance Stabilization Network", which is reasonably stable
in its design. An interesting experiment is to use the CM/DM choke on a
power cord plugged into a LISN and examine the differences,
On 12/17/2024 4:27 PM, Ken Wyatt wrote:
We’ll need a lot more information on what you’re testing, the test
setup configuration and how you’re measuring DM and CM. Can you share
some photos or screen captures?
Usually there will be a difference between DM and CM current spectral
response. Now Line and Neutral from a LISN will like look the same
typically.
Kenneth Wyatt
Windsor, CO
On Dec 17, 2024, at 13:46, [email protected] wrote:
Clamp is ok for investigate DM and CM currents. LISN for formal
testing at lab.
Right now, the plots of CM and DM currents are almost equal over the
whole spectrum (10k – 30MHz). Surprise?
In the same setup, using a LISN, the spectrum is quite different
regarding peaks and waveform.
I know the information from this test is defective, but do you have a
first thought anyway?
BR
Amund
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