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Who have used the device to measure Impedance to Common Mode Current vs frequency for bifilar and coax wound ferrite toroid of various materials?

Interested in a step-by-step procedure, which leads tied together, measurements shield to shield, graphic results, and perhaps pictures of test jigs, comments on tolerance, etc.

Thanks!!

Ed McCann
AG6CX

Ed, Check the file section for Balun/choke investigation.

Mel, K6KBE

Impedance to Common Mode Current vs frequency

Some Wiki Application Notes page entries may be helpful
/g/nanovna-users/wiki/Application-Notes

Common-mode chokes by G3TXQ
ferrite bead measurements
test jigs

I have used several instruments and procedures to measure the isolation in
dB, and impedance in ohms (calculated of course) using K9YC method and S21
on VNAs. They all come terribly close together.
Care must be made in how the test jigs are set up and calibrated. With my
setup, I can easily see return loss of 50-70 dB open circuit. I have
pictures of the various ones I have used if you are interested.

Mel, K6KBE

On Sat, Nov 2, 2019 at 10:32 AM Mel Farrer, K6KBE via Groups.Io <farrermesa=
[email protected]> wrote:

Ed, Check the file section for Balun/choke investigation.

Mel, K6KBE

On Sat, Nov 2, 2019 at 10:23 AM Edward McCann <Ag6cx1@...> wrote:

Who have used the device to measure Impedance to Common Mode Current vs
frequency for bifilar and coax wound ferrite toroid of various materials?

Interested in a step-by-step procedure, which leads tied together,
measurements shield to shield, graphic results, and perhaps pictures of
test jigs, comments on tolerance, etc.

Thanks!!

Ed McCann
AG6CX