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Thank you guys, I connected before the choke coil, there are 3kV capacitors so the voltage can't be higher than that. I used HV resistors.

Now I'm stucked with the arc voltage.
I placed a 9V battery on the input with a potmeter to test it. I set and calibrrated everything, encoder.0.velocity net to arc-voltage-in, the value changes with the pot but the arc voltage on the GUI and arc-voltage-out signal does not change, stays zero. Tried different scale settings, no result.
How to get that voltage?

Seems like you’re still using the default post processor instead of the one Phill posted…

For the lowest latency, you might have better luck with RTAI than PREEMPT_RT, assuming the BIOS isn't buggy:

forum.linuxcnc.org/9-installing-linuxcnc...ng-rtai-debs-for-2-9

If you need help, let us know!