Power Meter Operation

Battery Operation (Option 001)

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.

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HP E4419B User’s Guide