What the problem with noise is that USB is ground referenced communication and this means that the PC and the USB device communication data is referenced to a common ground point, this point is the chassis ground potential of the computer, let's call this 0Volts. However there are plasma units which themselves generating too much EMI noise which will be a problem even if your grounding is as optimal as possible. What you should do is to verify the grounding, make sure that everything is grounded to a single point called star ground point and make the ground wires as thick and short as possible. And let's say that resistor is your ground wire. Generally speaking about plasma units, they are mostly generating lots of EMI noise and you can make that worse if things are not properly grounded.įor example an only 0.1 Ohms of resistance switching 100Ampers will produce a 10Volts voltage difference on that resistor. So you physically have to replug the USB connection to make the USB chipset to reestablish the communication with the device. The thing that you have to replug the UC100 to the USB port in order to make it work again means that your computer's USB chipset got an error and gave up the communication and disconnected your UC100, This sounds like a serious noise issue coming from your plasma unit and effecting your computer and the UC100.
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