Okay. One more data point. This adds the front-panel output value, mapping it across the resistance values. The pedal was full-down for the front-panel series. The welder was plugged into 110v power for the exercise, so I could have it in the same room as my computer.
I think this really clearly demonstrates the issue. More than half of the dial's travel range is spent between 27 and 19 amps, which is only 10% of the usable range of the pedal (96 to 19 amps).
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