One can change the values on the left two devices in order to change the intensity of the beam. If this is not possible to do via Setpoint, then dial in the desired value. Press "LOKAL" button, and while holding this button, press and hold "SET" button until the digital readout value stops changing. Releasing both buttons, should leave the slit in the computer control mode. If this is not so, press "COMP" button to ensure that.