Battery Handling, Maintenance and Good Practices
128
Maintainin
the Instrument
The AC Power LED is only on when the power cord is connected and AC power is available
to the Monitor. In this case, the battery can be either charging or fully charged.
The battery LED can be green, yellow, or red depending on the following conditions:
If the remaining battery-operating time is only 5 minutes, the LED flashes red at a repetition
rate of 1.5 flashes per second.
When the battery is empty, the Monitor switches off automatically (including the green On-
Off/Standby LED on the front panel). This switch-off event is memorized together with the
serial number of the battery. A restart of the Monitor with this battery is inhibited to prevent
deep discharge. Attempts to restart the Monitor (by pressing the On-Off/Standby) causes the
red LED to emit a single flash. (The flash may have a delay of up to 2.5 sec after pressing the
On-Off/Standby key). Exchanging the battery causes one of the following to happen:
• If the new battery is partly or fully loaded, the Monitor starts operating.
• If the new battery is empty:
• If the battery voltage (no load) is below 11.5V, a single red flash is emitted (assuming that
there is still enough power to emit this single flash).
• If the battery voltage is higher than 11.5V (no load) the Monitor tries to restart. If the bat-
tery voltage falls below 10.5 V during charging, the Monitor registers the batttery as
empty, and the Monitor switches off automatically. Any attempt to restart the Monitor (by
pressing the On-Off/Standby) causes the red LED to emit a single flash. No more restarts
can be attempted with this battery.
AC power Yes No
standby switch on or off on off
battery full
a
(no charging)
a. Relative state of charge.
green off off
battery charging yellow not applicable not applicable
replace battery
b
(>= 5 minutes of
operation left)
b. Battery voltage less than 11.5V.
not applicable 1.5 red flashes per sec. off
battery empty yellow red flash if On-Off /
Standby is pressed.
c
c. Restart is attempted if V_bat > 11.5V and battery is not registered as being empty or having a malfunction.
off
no battery off off off
battery malfunction every 2 second briefly
off
red flash if On-Off/
Standby is pressed
c
off
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