www.theactigraph.com
P a g e
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13
49 E. Chase St. Pensacola, FL 32502 tel 850.332-7900 fax 850-332-7904
Low Voltage Mode (HALT)
ActiGraph devices enter a “Low Voltage Mode” (or HALT) state when the battery discharges beyond a
point of being able to power the device. In this mode, all important variables and data are stored in
flash memory to secure the device download. Because the device’s internal clock stops in HALT mode,
the device cannot be recharged and redeployed; the device must be downloaded and reinitialized to
continue use.
Recharging and LED Decoding
Recharging is automatic and is accomplished by connecting the device to a standard USB port. Charging
time will depend on the battery life, but typically will not exceed four hours for a fully depleted battery
to become fully charged. Once the battery is completely charged, the green LED will remain illuminated.
If the battery voltage drops below 3.1 volts while in use, the device will not have sufficient power to
collect data and will warn the user through a series of coded flashes (see
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found.
). The battery level, reported in volts, can be viewed at any time by starting the ActiLife software
and plugging in the device.
Important: ActiLife will not allow initialization if the voltage is below 3.85 volts.
