Fluke 434 - Manual (Page 21)

Basic Operations and Menu Navigation
Display Brightness
4
4-3
Caution
To prevent decrease of battery capacity, charge it at least twice
a year.
Power On/Off:
Press to power up or down with the last setup configuration.
The welcome screen shows what Analyzer settings are
currently in use. At power on a single beep can be heard.
To save battery power, the Analyzer display turns off automatically when no keys are
operated during a certain time. This time is adjustable.
When a key is operated, the display turns on again.
For the adjustment of Auto-off time see Chapter 18, USER PREFerences.
Display Brightness
Press repeatedly to dim/brighten the backlight.
Keep pressed during 5 seconds for extra brightness for
better visibility in strong sunlight.
Low brightness saves battery power.
Locking the keyboard
The keyboard can be locked to prevent unwanted operation during unattended
measurements:
ENTER
Press for 5 seconds to lock or unlock the keyboard.