Keysight Technologies U1273A Quick Start Manual page 7

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Auto Dim
By default, the multimeter's Auto Dim function is
enabled. The multimeter's backlight will dim
automatically after 90 seconds of inactivity. Press
any button to cancel this effect and reset the Auto
Dim timer.
You may change how the multimeter's backlight
behavior through the Setup menu. Refer to the
User's Guide for further instructions.
Keysight U1273A/U1273AX Quick Start Guide 7