Fluke 377 - Power Management; Auto Power Off Functionality; Backlight Operation

Clamp Meter
Power
9
Power
Two AA batteries supply power to the Clamp.
To turn on the Clamp, rotate the control knob to a function.
To turn off the Clamp, rotate the control knob to OFF.
Auto Power Off
The Clamp automatically powers off after 20 minutes of no use. If
the Clamp automatically powers off, turn the Control Knob to OFF
and then to a function.
To disable auto power off, see Power-On Options.
Note
Auto power off is always disabled when you use the
Min/Max/Avg function.
Backlight
The display on the Clamp includes a backlight that improves the
readability in dim work areas.
To turn on the backlight, hold B for >2 seconds.
To turn off the backlight, hold B for >2 seconds.
The backlight has an auto off feature that turns off the backlight
after 2 minutes of no use. To disable the auto off backlight feature,
see Power-On Options.