Question: how to check ocv on welding machine?
Answer: Turn the HF off before using the voltmeter. There is no need to set the voltage range to more than 100 volts. The maximum OCV is around 80-84 volts as dictated by the NEMA. The intent is that the maximum OCV should not be high enough to electrocute the welder if he inadvertantly becomes part of the electrical circuit.