Hach-Lange DR 3900 User Manual - Manual (Page 24)

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Start up
4.4 Sleep mode
The instrument can be put into sleep mode.
1. Briefly press the power button next to the display.
The "Sleep mode" message is shown. The display will then
switch off automatically.
2. To switch on, press the power button next to the display.
The self-check will start automatically.
After that, the instrument is ready to use.
4.5 Power off the instrument
1. Press the power button next to the display for
approximately 5 seconds.