... disappears. b. Parameter settings: 1) "Set" key as a parameter shift key. Press "Settings" button; enter the set state, A, B, C, D, ... separately; press "confirm" key to set and change parameter, re-press "confirm" key , exit setting, Press "Setting" key to return to working ... lower limit value, enquiring user whether parameter has been set, if “" key pressed, then parameter setting finish and it will ...