ActiGraph LLC 03 Manual Do Utilizador
actigraphcorp.com
49 E. Chase Street Pensacola, FL 32502
tel (850) 332-7900
fax (850) 332-7904
TAS14DOC07 User’s Manual
Page 11 of 21
Dynamic Range
+/- 2000
Deg/sec
Table 2 – Gyroscope Key Specifications
Magnetometer
A three axis gyroscope collects angular velocity in units of degrees/sec. Data is sampled at 100 Hz.
Parameter
Value
Units
Axis
3
Sensitivity
0.6
µT/LSB
Dynamic Range
+/- 4800
υT/LSB
Table 3 – Magnetometer Key Specifications
Steps
Step counts are accumulated on a per-epoch basis and are based on accelerometer data collected on
the vertical axis. An algorithm present in the device firmware filters out the accelerometer’s baseline
noise level to help accurately accumulate the steps-per-epoch.
the vertical axis. An algorithm present in the device firmware filters out the accelerometer’s baseline
noise level to help accurately accumulate the steps-per-epoch.
Inclinometer
The inclinometer feature can help users identify the orientation of the device and, more importantly,
when the device itself was taken off. Each epoch is flagged with a number (1 through 4) to indicate the
orientation of the device during that epoch. For ActiGraph Link devices, this is done within the ActiLife
software when converting the *.gt3x file to *.agd format. As noted, the inclinometer feature is only
valid when the device is worn vertically on the point of the hip. More details are available in the
when the device itself was taken off. Each epoch is flagged with a number (1 through 4) to indicate the
orientation of the device during that epoch. For ActiGraph Link devices, this is done within the ActiLife
software when converting the *.gt3x file to *.agd format. As noted, the inclinometer feature is only
valid when the device is worn vertically on the point of the hip. More details are available in the
Important The inclinometer feature is only valid if the device is worn on the hip
with Axis 1 upward facing.
with Axis 1 upward facing.
Inclinometer Code
(Stored with each Epoch)
Interpretation
0
Device Off (Not Being Worn)
1
Subject Standing
2
Subject Lying Horizontal
3
Subject Sitting
Table 4 - Inclinometer Definitions