The connection (plasma mode) of SH-HC31 and the voltage divider box AHD4
If the plasma power is raw arc voltage, then connect to WK+ and ET-. And AHD4 only DIP 1
(100:1) is ON.
If the plasma power is 50:1 arc voltage, then connect to WK+ and ET-. And AHD4 only DIP 3
(2:1) is ON.
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