For contact discharge, first touch the discharge tip (sharp tip) to the EUT surface and then pull the trigger once.　The trigger can be released soon. Discharges are automatically repeated in line with settings on the counter and interval.

For the correct air discharge test, the discharge gun shall be positioned at least 50 cm away from the EUT discharge point first and then pull and hold the trigger (this action is required for  the internal high voltage switch in the gun to remain “on” position) and then approach the discharge tip to the EUT until a discharge occurs.