actigraphcorp.com
14
Viewing the IMU Data
After completing the download, select
File > Import/Export/Convert > IMU
in the ActiLife task bar.
Select the raw (.gt3x) file from the list and click
‘Open.’
A status bar will appear while ActiLife converts the raw file to CSV. Once completed, the file location window
will open and the IMU file will appear in the list.
About the IMU file
The IMU file will contain some or all of the following information based on the IMU selections made during
initialization. The sample rate of the IMU file is fixed at 100 Hz.
Timestamp
The timestamps shown in the exported .csv file are formatted to show the full date in YYYY-MM-DD
format. The “T” symbol indicates the beginning of the time element for the timestamp. The time is
formatted as hh:mm:ss.ss where the last “ss” represents the fractional portion of the timestamp. Each
entry increments by 0.01 seconds (because of the 100Hz fixed sample rate)
Accelerometer X, Y, Z
Each accelerometer entry represents instantaneous acceleration for the axis indicated in units of gravity
(Gs). Device orientation is shown
in this help
article.
The accelerometer on the IMU has a dynamic range of +/- 16Gs per axis
Gyroscope X, Y, Z
Gyroscope measurements from the IMU represent are presented in degrees/sec for each axis. Refer to
this help article
for details regarding roll/pitch/yaw orientation.
Magnetometer X, Y, Z
The IMU magnetometer readings represent the magnetic field experienced by the Link device and are
useful for discerning directional orientation (compass). These readings are in microTesla (µT)
IMU Temperature
The IMU temperature reading indicates ambient temperature inside of the Link activity monitor and is
indicated in degrees Celsius (C).
3
2
1
Note: The accelerometer data in the IMU file is not from the primary accelerometer and is not used for scoring in ActiLife.
-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐ Data File Created By Ac1Graph Link IMU 9DOF Sensor Ac1Life v6.11.5 Firmware v1.0.0 date format M/d/yyyy at 100 Hz -‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐
Serial Number: TAS1C32140060
Start Time 09:25:59
Start Date 11/4/2014
Epoch Period (hh:mm:ss) 00:00:00
Download Time 15:46:48
Download Date 11/4/2014
Current Memory Address: 0
Current BaYery Voltage: 4.03 Mode = 12
-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐-‐
Timestamp
Accelerometer X
Accelerometer Y
Accelerometer ZTemperature
Gyroscope X
Gyroscope Y
Gyroscope Z
Magnetometer XMagnetometer Y
Magnetometer Z
2014-‐11-‐04T09:25:59.0000000
0.418945
-‐0.60791
0.327637
63.016354
69.763188
-‐28.564455
13.977052
27.246092
9.667968 15.234374
2014-‐11-‐04T09:25:59.0100000
0.441406
-‐0.554688
0.32666
63.726211
51.635745
-‐48.828128
9.216309
27.246092
9.667968 15.234374
2014-‐11-‐04T09:25:59.0200000
0.475586
-‐0.530273
0.333496
63.78312
34.790041
-‐74.157719
3.90625
27.246092
9.667968 15.234374
2014-‐11-‐04T09:25:59.0300000
0.48584
-‐0.477539
0.293945
63.768144
31.127932
-‐94.421392
-‐2.624512
27.246092
9.667968 15.234374
2014-‐11-‐04T09:25:59.0400000
0.439453
-‐0.373535
0.26709
63.768144
33.447268
-‐97.10694
-‐11.413575
27.246092
9.667968 15.234374
2014-‐11-‐04T09:25:59.0500000
0.289551
-‐0.293945
0.527344
63.759158
49.56055
-‐54.382328
-‐16.967774
27.246092
9.667968 15.234374
2014-‐11-‐04T09:25:59.0600000
0.225098
-‐0.227539
0.425781
63.753168
83.190923
-‐15.502931
-‐2.685547
27.246092
9.667968 15.234374
2014-‐11-‐04T09:25:59.0700000
0.270996
-‐0.169922
0.38623
63.768144
102.050787
-‐10.864258
21.240236
27.246092
9.667968 15.234374
2014-‐11-‐04T09:25:59.0800000
0.330566
-‐0.135254
0.400879
63.759158
114.807136
1.831055
39.489749
27.246092
9.667968 15.234374
2014-‐11-‐04T09:25:59.0900000
0.373535
-‐0.094727
0.436035
63.774134
134.948739
-‐2.563477
46.691897
27.246092
9.667968 15.234374
2014-‐11-‐04T09:25:59.1000000
0.461426
0.037109
0.38623
63.759158
161.315928
-‐18.005372
38.33008
27.246092
9.667968 15.234374
2014-‐11-‐04T09:25:59.1100000
0.375977
0.137695
-‐0.008789
63.750173
169.494639
-‐52.917484
-‐1.708984
27.246092
9.667968 15.234374
2014-‐11-‐04T09:25:59.1200000
-‐0.105957
0.005859
0.072266
63.759158
111.206061
-‐152.160654
-‐39.367678
27.246092
9.667968 15.234374
2014-‐11-‐04T09:25:59.1300000
-‐0.36084
-‐0.111328
0.587402
63.753168
56.823734
-‐177.978526
-‐14.709474
22.705077
13.037109 21.240233
2014-‐11-‐04T09:25:59.1400000
-‐0.378418
-‐0.197754
0.773438
63.741187
73.974614
-‐125.244148
47.66846
22.705077
13.037109 21.240233
2014-‐11-‐04T09:25:59.1500000
-‐0.203613
-‐0.334473
0.708984
63.747178
102.600104
-‐76.477055
118.835456
22.705077
13.037109 21.240233
2014-‐11-‐04T09:25:59.1600000
0.030273
-‐0.541016
0.594238
63.747178
92.041021
-‐49.926761
173.034679
22.705077
13.037109 21.240233
2014-‐11-‐04T09:25:59.1700000
0.270996
-‐0.837402
0.657715
63.735197
47.119144
-‐62.744144
197.509778
22.705077
13.037109 21.240233
2014-‐11-‐04T09:25:59.1800000
0.520508
-‐1.158691
0.774414
63.750173
4.821778
-‐100.036627
196.777356
22.705077
13.037109 21.240233
