Agilent Technologies E4419B User Manual page 159

Battery
This softkey is only present on power meters fitted with the
battery option 001. It is greyed out when the battery is not
installed.
Press this softkey to produce a screen which shows:
- How much charge the battery is holding
- The approximate running time left under battery power.
- Either, "Using ac power" (if the battery is fully charged),
"Charging battery", or "Using battery power" as
applicable.
This softkey also accesses the Battery menu which allows you
to set the display backlight to On, Off, or Timed mode. In
Timed mode, the backlight turns off 10 minutes after the last
key press. To turn the backlight on again, press any key. While
operating with ac power connected these keys are grayed out
and the backlight is permanently on. On instrument preset
the Backlight is set to "On"
Backlight On
Press this softkey to turn the display backlight permanently
On.
Backlight Off
Press this softkey to set the display backlight to be Off while
the power meter is operating under battery power.
Backlight Timed
Press this softkey to select the Backlight Timed mode. When
the power meter is in this mode and is operating under
battery power, the display backlight turns off 10 minutes
after the last key press. To turn the backlight back on, press
any key.
Done
Pressing this softkey returns the display to the previous
screen.
Agilent E4419B User's Guide
Front Panel Menu Reference "System/Inputs" Menu
Menu Reference
3-33