Activinsights GENEActiv Руководство по эксплуатации - Страница 15
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ii). Understanding .bin files
The .bin file output when opened will display as the following:
Main header (lines 1 to 59)
Pages of 300 measurements (lines 60 to 72, 73 to 85 etc)
Each page will have a sub header (e.g. lines 61 to 68)
Data block (e.g. lines 69 to 72)
1
The time span of a page is dependent on the measurement frequency. Each measurement consists
of 3 axis of acceleration, a light measurement, and the button status. In the page header, the battery
voltage and the temperature are recorded as well as some of the basic set-up information.
The time stamp of the page corresponds to the first measurement of the page. The first 300
measurements block of the hexadecimal data starts on line 69 of the file. This is a sequential stream
of 6-byte data blocks, starting at the timestamp in the page header.
1
a
a 12 bits
accelerometer x axis (+/- 2048)*
b 12 bits
accelerometer y axis (+/- 2048)*
c 12 bits
accelerometer z axis (+/- 2048)*
d 10 bits
light meter (0-1024)*
e 1 bit
button status (1 on / 0 off)
f 1 bit
reserved (set to zero)
The GENEActiv device stores raw data to allow all processing to be completed off-line. Calibration data
is created in production and recorded to be applied in post-processing.
Accelerometer x, y & z axis: calibrated measurement = (output*100 - offset) / gain (g)
Light meter: calibrated measurement = output * lux / volts (lux)
2-3
7 6 5 4 3 2 1 0
2
3
b
4
5-100
4
5
c
6
d
e
f
15