User Guide
26
Using External Power
The 688 uses only one power source at a time, with external DC power taking
precedence over internal AA battery power.
To connect an external power source:
X
Plug a DC power source (not included) into the 10-18 VDC input on the
right panel.
L
Pin-4 of the locking, Hirose connector is positive (+) and pin-1 is negative (-).
Using Battery Power
The 688 uses
fi
ve AA batteries as a backup to external power. Alkaline AA bat-
teries may be used with the 688; however, NiMH batteries are the preferred
type because they provide for longer run times compared to Alkaline batteries.
To insert batteries:
1. Unscrew the battery cap (counter-clockwise).
2. Insert
fi
ve AA NiMH batteries (not included) into the battery tube. Orient
the batteries with the positive (+) end facing in and the negative (-) end
facing out.
L
With external power connected, depleted AA batteries may be removed from the
688 and replaced with new ones without affecting operations.
Voltage Ranges and Thresholds
The DC voltage indicator provides power status information based on the Ex-
ternal DC Reference parameter, which de
fi
nes the voltage range and warning
threshold for external DC power sources. Setting the External DC Reference to a
value appropriate for the type of external power being used maximizes runtime
with that source.
For instance, the indicator appears solid green when the active power source is
full or operating within the de
fi
ned high voltage range. As the voltage depletes,
the indicator’s color changes from green to yellow (warning) to orange (low)
and to red (critical), based on the external power source’s range and threshold,
as shown in the following table: