Support Center

What does the blinking LED mean?

Last Updated: Jul 26, 2016 05:54PM CDT
The LED (the light on the device) blinks for many reasons. Mainly, due to the device charging while attached to your computer.  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. Once the battery is completely charged (max voltage of approximately 4.18V), the LED light will remain illuminated. If the battery voltage drops below 3.1 volts while in use, the Actigraphs will not have sufficient power to collect data and will warn the user through a series of coded flashes. The battery level, reported in volts, can be viewed at any time by starting ActiLife and plugging in the device.
 
Important: ActiLife will not allow initialization if the voltage is below 3.82 volts (approximately 60%).
 
ActiGraph GT3X+ Connected to PC
Red LED (Fault Indicator)
2 Flashes Li-Ion Battery is Faulty
Green LED
1 Flash Battery Charging
Multiple Flashes Communicating with PC via USB
Steady On Battery Fully Charged
ActiGraph GT3X+ Not Connected to PC
Red LED (Fault Indicator)
No Flashing (LED Off) Normal operating condition or battery dead
2 Flashes Low Battery (use ActiLife software to check for remaining battery life). The unit needs to be recharged.
3 Flashes Unexpected Battery Failure (Temporary battery power loss) or Battery Level has fallen below 3.1V and the unit has entered Halt Mode.
Green LED
No Flashing (LED Off)
Actively collecting data ("Flash Mode" disabled) or battery dead
1 Flash Delay before start mode (the LED always flashes prior to starting data collection) or Actively taking data ("Flash Mode" enabled - not recommended)
2 Flashes N/A
3 Flashes End of memory reached (Device no longer collecting data) or Battery died while unit was in delay before start mode (no data collected on device)
Note: The Red LED will ALWAYS flash to indicate LOW BATTERY regardless of whether "Flash Mode" in enabled or disabled. If a "Stop Time" (optional) has been reached, the Green LED will stop flashing all together regardless of its previous state.
 
 
ActiGraph GT1M/ASM/GT3X Connected to PC
1 Flash Li-Ion Battery is Charging
2 Flashes Li-Ion Battery is Faulty
Steady On Battery Charged
ActiGraph GT1M/ASM/GT3X Not Connected to PC
Not Flashing (LED Off) Actively collecting data ("Flash Mode" Disabled) or dead battery
1 Flash Delay before start mode (the LED always flashes prior to starting data collection) or Actively taking data ("Flash Mode" Enabled - not recommended)
2 Flashes Low Battery (use ActiLife software to check for remaining battery life) The unit needs to be recharged
3 Flashes End of memory reached (Device no longer collecting data) or Battery has fallen below 3.1V and the unit has entered Halt Mode (unit has stopped collecting data)
Note: The LED will ALWAYS flash to indicate LOW BATTERY regardless of whether "Flash Mode" in enabled or disabled. If a "Stop Time" (optional) has been reached, the Green LED will stop flashing all together regardless of its previous state.
 

If you need any further assistance, please go to our support portal at https://help.theactigraph.com/home. From there, you can view many helpful FAQ's and Troubleshooting Articles; log in to check any existing Support Requests; or create a new Support Ticket if you are unable to find a solution. You can also email us at support@theactigraph.com or give us a call at (877) 497-6996, Monday through Friday, 8 am to 5 pm CST.

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