Model 831 Manual Powering the Model 831 2-9
Low Voltage Shutdown
The Model 831 has a special feature to preserve the service
life of an external SLA (Sealed Lead-Acid) battery by
preventing it from being discharged excessively. When the
battery voltage drops below the external shutoff voltage
(default value +10.8 volts), but remains above +10.2 volts
for one minute, the instrument will stop, save data and turn
the Model 831 off.
Power Outage
In the event of power outage, unattended Model 831 meters
with serial numbers greater than 2089 will turn on
automatically in six hours as a recovery mechanism.
Sudden Loss of External Voltage
WARNING!
A sudden loss of power while the
Model 831 is storing data may lead
to hardware damage and should be
avoided. To avoid this, turn off the
Model 831 prior to turning off the
PC, or before unplugging USB
cables from the PC.
If the external voltage is suddenly lost, for example when
the external supply is disconnected or when mains power
fails and there is no external battery, the Model 831 will
continue to run on internal batteries if they are present and in
good condition. Without internal batteries, the Model 831
will shut-down and un-stored data may be lost.
Power-Up Operation
The Model 831 automatically detects its power source while
it is turning on and does not fully start if a problem is found.
Insufficient Battery Voltage
If the internal battery is powering the instrument, i.e. there is
not USB or external power, and is less than ~4.2 Volts, the
display shown in FIGURE 2-9 appears with the grey box
inside
FIGURE 2-9 Insufficient Battery Voltage
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