Hach DR 2800 Manuale Utente

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Standard Operations
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.