SoundAdvisor Model 831C
Powering the 831C SLM
3-7
Using USB Port Power
The 831C can be powered via the mini-USB Type B port with the PSA029
external power supply and the included power cable (CBL138). The
mini-USB Type B connector is located on the bottom of the meter.
CAUTION
If you operate the
831C without batteries and
power is interrupted, you may
loose your data.
With the PSA029 power supply connected and operating at rated
conditions, the 831C operates properly with or without batteries
installed. Use the included cable to prevent excessive power loss.
3.5.3 Understanding 31C Power Usage
Understanding a Low oltage Shutdown Event
The 831C preserves the service life of an external battery by preventing
it from being discharged excessively. When the battery voltage drops
below the External Shutoff Voltage (default value +10.8 volts) and
remains above +10.2 volts for one minute, the instrument stops, saves
data, and turns off.
Understanding a Power On After Power Loss Event
When the 831C is powered from an external supply and the input
voltage falls below the indicated External Shutoff Voltage threshold, it
powers off. When the 831C shuts down due to a low battery, it
automatically attempts to power up after a short reprieve. If there’s
adequate power, it remains on. However, if the battery is still
discharged, it powers off. This attempted “power on” cycle continues
until the meter has sufficient power to remain on. This feature is
designed to allow the 831C to automatically restart when power is lost
due to low solar situation or after an extended power outage.
LEARN MORE
To learn more about reboot time after a power loss, see “Low Power
At Boot-Up” on page A-5.
Understanding a Sudden Loss of External oltage Event
When the external voltage is suddenly lost—if the external supply is
disconnected or the main power fails and there is no external battery—
the 831C continues to run on internal batteries if they are present and
in good condition. If battery power is not present, the 831C
immediately switches to an internal recovery battery and powers down
safely.
Understanding the External Power Indicator
When connected to an external power source using the included USB
cable, the External Power icon
replaces the Battery icon.
If your meter has fully-charged NiMH batteries and is plugged into a
power source, this icon indicates that it’s using power from the external
source, and is not charging or using any power from the batteries.
