Hach Portable Spectrophotometer DR 2800 User Manual page 30

Standard Operations
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2. Select one of the options under Standby mode to set the
length of the idle period that can elapse before the instrument
switches to the Standby mode when running on battery power.
Note: In standby mode, the backlighting of the screen is switched off.
Touching the display causes the lighting to switch on again.
3. Select one of the options under Auto off to set the length of the
idle period that can elapse before the instrument automatically
switches off when running on battery power.
Note: After the instrument switches itself off automatically, you have to
press the push-button switch on the back of the instrument to start it
again.