Some background information may stir up a reply- when I was trying to cut with the DTHC on, the torch would rapidly rise, and the cutting voltage would not go over about 20 volts. An error message would appear "torch voltage out of acceptable range" or something to that effect. With the Digital Torch Height Control off, the cuts would nice and clean- the Hypertherm is working fine as far as cutting goes. But somehow the arc signal from the torch is messed up. Either there is a problem of some sort on the main Hypertherm circuit board, or something is screwy in the Mach 3 software- there's just nothing else left to be the culpret. What I'm hoping to get here is some info on the Hypertherm raw arc or divided arc voltage so that I can test it here before I have to send the whole unit or the board to some repair center. Where's Jim Colt when you need him? lol.