What kind of Instrument can measures load voltage and load current?
For phase control, use a movable iron piece type, effective value calculation type measuring instrument.
Rectification type and general testers are not suitable for accurate measurement.
In the case of zero-cross control, the ON and OFF are repeated, so the indicator needle of the meter sways in normal measuring instruments. Use a percent meter to measure the controlled variable. When using the Sheet-key Setting Unit, the standard type phase control can display the output current value, and the zero cross control can display the control output amount.