Good point James. The EM clamp is well behaved and understood. My
comment was only meant to address a simple device like an FCC F-33 used
on a cord plugged into the wall mains.
Thanks for the clarification!
- Brent
On 1/2/2025 3:50 AM, James Pawson (U3C) wrote:
Following up on Brent’s reply, the CM current measured by the probe
will be partially determined by the CM termination impedance which is
150 ohms in the CISPR setups. You can use an IEC 61000-4-6 EM clamp to
approximate this with reasonably good results.
All the best
James
James Pawson
Managing Director & EMC Problem Solver
*Unit 3 Compliance Ltd*
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*From:*Brent DeWitt <bdew...@ix.netcom.com>
*Sent:* 17 December 2024 21:54
*To:* EMC-PSTC@LISTSERV.IEEE.ORG
*Subject:* Re: [PSES] Conducted emission - LISN vs. current clamp
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, am...@westin-emission.no 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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