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Hi all,

I wondered if there was a guide somewhere I could read showing me how to measure the Impeedance and Reactance of Common Mode Chokes.

At this point in time I'm testing my chokes using S21 Gain which gives a minus DB for the Impeedance of the Device Under Test (DOT).

However, I would like to see the reative component of the DOT.

If anyone can help me it would be great.

M0VUE

Almost two years ago, I posted several tutorials to this group indicating
how to measure both parameters. Those procedures should be in the archives
in this group.

Dave - W0LEV

On Mon, Feb 20, 2023 at 4:17 PM c suddell via groups.io <chrissuddell=
[email protected]> wrote:

Hi all,

I wondered if there was a guide somewhere I could read showing me how to
measure the Impeedance and Reactance of Common Mode Chokes.

At this point in time I'm testing my chokes using S21 Gain which gives a
minus DB for the Impeedance of the Device Under Test (DOT).

However, I would like to see the reative component of the DOT.

If anyone can help me it would be great.

M0VUE

--
*Dave - W?LEV*


--
Dave - W?LEV

Something to keep in mind, and was briefly discussed on this list several months ago - nano has "common ground" connecting both ports, and CMC usually does not.

Calibration does seem to compensate for that in part, but not completely!

The best approach - separate your DUT (CMC) by using good 1:1 transformers that will decouple CMC from the ground

On Mon, Feb 20, 2023 at 08:17 AM, c suddell wrote:

I wondered if there was a guide somewhere I could read showing me how to
measure the Impeedance and Reactance of Common Mode Chokes.

At this point in time I'm testing my chokes using S21 Gain which gives a minus
DB for the Impeedance of the Device Under Test (DOT).

However, I would like to see the reative component of the DOT.

If anyone can help me it would be great.

There has been a lot of discussion on this topic in this group. Here are the links to help you get familiar with how to do it...
/g/nanovna-users/message/19941
/g/nanovna-users/message/10836
/g/nanovna-users/message/6328

Roger