You can switch OFF the backlight (illumination) of the LCD screen of the E4982A. This extends the life of the backlight when it is used continuously over a long period.
Press System > Service > Backlight > ON.
The backlight that has been switched OFF can be turned ON again by pressing any part of the touch screen or pressing any key on the front panel.
You can also turn OFF the display of the LCD screen.
Press Display > Display > ON|OFF.
Switching OFF the display causes the indications on the LCD screen to be almost invisible.
The display that has been switched OFF can be turned ON again by pressing any key on the front panel.