I'm trying to prepare a setup to see the effect of this torodial ferrite ring.. Even though I still didn't understand what way to wind wires to obtain a common mode choke(I saw differnt ways of winding ways), assuming I achieved it, can I use the following setup to observe the choke's effect on CM interference. I plan to use a function generator to create the CM mode voltage and a scope to observe as shown below where Rg is to limit the current across return wire:
If the model is correct, above shows the Bode plot. Lp and Ls are to model the choke made up of the wires wound around the ferrite ring.
I want to wound wires such that I can obtain a good attenuation for frequencies above 1 MegHz. Since there is nothing written about it in the datasheet I need to experimentally find out how many turns/winds I need.
Is my setup proper for such test to see the effect of the choke? If not what should it look like?
(My aim is to roughly demonstrate the effect not a professional setup)
Above shows if I use caps to route CM currents back to the function generator instead of using a common ground.
In simulation above Scope and Scope_GND are exactly the same. So does that mean the potential difference will be zero and I will not see anything on scope regarding the attenuation? (Yes it is balanced but then I won't see any change on scope screen isnt it?)
How about the following?: