Understanding EMC: Ground Loop and Return Path (A Practical Demonstration)

[@jluke6861]

Thank you for your great videos.

[@mostafanfs]

Very interesting experiment based on simple stuff

[@hashanbandara788]

Good demonstration

[@paulh0029]

Great demonstration thanks

[@Electric_Feelz]

Thank you! what would happen to the current as measured on the black wire if the "shorter" bnc ground disconnected? id assume the current would increase?

[@jackhowardbourne]

Yes I would have liked to have seen this.
I think the current wouldve been higher at 50Hz than at 500kHz with ground BNC disconnected.
5Vpk-pk signal into 50ohm is 100mA pk-pk. The cable however isnt 50R so I think that's where the losses come from at higher frequencies. (It was around 60mA pk-pk at 500kHz)

[@MachOneDesignEMC]

@@jackhowardbourne Hi Both, both valid points, I had to do an follow-up episode based on your great feedbacks, so check out next week's video.

[@RixtronixLAB]

Nice,thanks:)

[@MahdiMohammadi0]

did you check whether the whole current (black wire + BNC connection) is rising with increased frequency or not?

[@MachOneDesignEMC]

Hi Mahdi, good suggestions, they may increase tiny tiny, due to the skin effect, causing R increases, but not so obvious, what is interesting is the current distribution from one path to another, and in theory, when adding them together, they meet ohm's law. I just made another episode for next week. Hope you enjoy

[@MJ-vt1kp]

Good job 🙂

[@Fusion12345]

Is there a way to know the ratio of the current that goes through the black wire vs bnc at different frequencies?

[@MachOneDesignEMC]

If I used a direct short wire linking the centre of the BNC to BNC lead, and used a current probe, we can monitor this. Maybe thoughts for another video.

[@Fusion12345]

@MachOneDesignEMC Great! I'm tuning in

[@MachOneDesignEMC]

@@Fusion12345 Next week

[@Fusion12345]

@@MachOneDesignEMC yay can't wait

[@hashanbandara788]

Good demonstration