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HP4402.book : chapter2.fm 4 Fri Feb 12 15:32:45 1999
Power Meter Operation
Battery Operation (Option 001)
2-4 HP E4419B User’s Guide
Running time can be increased by operating the power meter with the
display backlight turned off (see “Backlight”, on page 2-4 ).
Figure 2-1: Battery Status
When the power meter is running on battery power and there are less
than 10 minutes of run-time remaining, the message “Battery Low”
appears at the top of the screen. In addition, a pop up window appears
every minute with the message “Battery Power Low”.
Charging Times
The battery charges automatically when the power meter is connected to
an ac source. From an empty state the battery is fully charged in less than
2 hours. After approximately 50 minutes the battery has enough charge to
enable 1 hour of operation with the backlight on. After approximately 35
minutes the battery has enough charge to enable 1 hour of operation with
the backlight off.
Backlight
When you are operating the power meter under battery power you can
turn the display backlight off or on, or set it to timed mode. In timed mode
the display backlight turns off 10 minutes after the last key press - the
display can be turned on again by pressing any key.
Working with the backlight off reduces the drain on the battery and
increases the operating time available by approximately 50%. The display
can be comfortably read in ambient daylight with the backlight off.