Hach-Lange DR 3900 User Manual - Manual (Page 42)

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Standard programs
User and password must be identical to the settings on the
target system.
15. Press User and enter the username.
16. Press OK to confirm.
17. Press Password and enter the password.
18. Press OK to confirm the entry.
19. Press Factory Default to restore the Network Settings to the
factory defaults.
5.2.8 Power Management
1. Press Power Management in "Instrument Setup".
2. Select Sleep Timer and press OK.
3. Select the required time span after which the instrument will
go into energy-saving sleep mode if it is not used (refer to
section 4.4, page 24 ), and confirm with OK.