Scope disconnects when trying to probe (6022BE)

[DC-Burger]

Hi all,

I'm new to all this and am just wondering what could cause the scope to disconnect when trying to probe a DIY induction heater.

I can read the gate input waveforms just fine when the half bridge in unpowered, however when I try to apply 12V for tuning/testing of the output coil openhantek freezes, the device disconnects. Then i need to restart openhantek.

Do I need a special usb hub for isolation ? Ive already checked that the voltages I'm reading do not exceed the ratings on the scope,

I checked with an analog scope that although I'm pushing 200khz from the driver, my coil rings at about 3Mhz. I am guessing it is the ringing that causes interference when i apply power to the drain / source of my half bridge.

[Ho-Ro]

DIY induction heater
I'm pushing 200khz from the driver, my coil rings at about 3Mhz

Oh - oh, high current and high frequency -> if your ground connection isn't rock solid it calls all kind of trouble.
You can use snap-on ferrites on all lines, position all cables carefully and avoid ground loops.

[DC-Burger]

Thanks for the response, I will do further testing to see if I can get it to play nice with the high frequency and magnetic interference.
Ferrite snap ons might be tricky to get hold of where I am but I believe I can get something figured out.

I'll post back on anything I figure out, cheers!