Hey guys, been trying to get a fully mobile welding rig set up and just discovered THD, Total Harmonic Distortion is going to be an issue on my Miller welder. I'm set up to run it off a Harbor Freight 7,000W generator and am looking for a way to get THD down to 5% or less to avoid destroying the newer style control board in the Miller Matic 211. So, anyone know of a THD supressor or filter I can plug in? I have no idea how much THD the cheapo generator is putting out either, is there a way to measure it? I'm 99% sure it is too high regardless. Thanks for any advice and ideas.