I have been chasing EMI and ground loop issues on my Crossfire Pro with Primeweld CUT60 for years. To be clear, I do not believe this is a Langmuir problem, the Primeweld CUT60 is known to be a noisy girl and was removed from their recommendations list. But that said, the Crossfire Pro electronics were not designed to have robust protection against such cutters that throw off a lot of noise.
What were my symptoms? The most common was simply disconnections to the electronics during a cut. But it gets worse, it has smoked laptop USB ports, cooked laptop speakers and touchscreen digitizer, released the magic smoke from resistors inside VIM modules, and caused problem after problem. THC signals were unreliable during live fire, and the voltage signal would stay floating high (very slowly lowering over time) even after the touch shut off. The problems were substantially worse when THC was used, regardless of whether I was using raw or divided. With THC wiring disconnected the issues were far less common, but not zero. Yes to all the usual troubleshooting, I removed PC power ground, yes there was absolutely no continuity between the controls chassis (i.e. USB ground) and the table, etc.
I have finally solved it once and for all using signal isolation modules for both the IHS and THC.
I now have zero issues.
I get an absolutely rock solid THC voltage signal, every time, every cut.
