Hach-Lange DR 3800 User Manual - Manual (Page 28)

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Standard Operations
5.2.4 Display and sound preferences
1. Press Display & Sound in the Instrument Setup.
The following options will be displayed:
• Display Brightness—Adjusts the display brightness to suit
lighting conditions.
• Screen touch—Activates//Deactivates a short beep each time
the screen is pressed (Default:off).
• Reading done—Activates/Deactivates a sound when a
reading is complete (Default: short beep every time a reading is
complete).
• Timer—Adjusts the length of the timer sound. Select Short or
Long. Long beeps are recommended for noisy environments.
2. Select Long to change the number of audio signals.
Use the alphanumeric keypad to enter/specify the number of
audio signals (4–25).
Note: A high number of audio signals increases the duration of the
tones and a small number of audio signals reduces the duration of the
tones.
3. Press OK to confirm. The selected number of the audio signals
sounds as a corresponding acoustic signal.
4. Press OK to confirm. The instrument will return to
Instrument Setup.
5.2.5 Lamp control
The tungsten lamp produces light in the wavelength spectrum
320 to 1100 nm.
The life span of the halogen lamp depends on the burning duration.
In order to extend the life span of the lamp, switch on the Lamp
control:
• If the instrument is not used during a longer period
(1–12 hours).
• If the instrument will never be switched off.