Understanding 831C Power Events And Indicators - Larson Davis SoundAdvisor 831C Reference Manual

2.2.3 Understanding 831C Power Events and Indicators

SoundAdvisor Model 831C
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.
If you operate the 831C without batteries and power is interrupted,
CAUTION
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.
Understanding a Low Voltage 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.
To learn more about reboot time after a power loss, see "Low Power At
LEARN MORE
Boot-Up" on page A-6.
Understanding a Sudden Loss of External Voltage 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
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.
Powering the 831C SLM
replaces the Battery icon.
2-7