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49 E. Chase St. Pensacola, FL 32502 tel 850.332-7900 fax 850-332-7904
Introduction
The wGT3X+ and wActiSleep+ activity monitors provide objective measurements of human activity and
are used in many research and clinical applications. They include a microelectromechanical system
(MEMS) based accelerometer and an ambient light as data sensors.
Specifications and Functionality of the wGT3X+ and wActiSleep+
Data
The devices include both an acceleration sensor as well as an ambient light sensor.
Acceleration
The devices include an acceleration sensor that consists of a microelectromechanical systems (MEMS)
accelerometer yielding the following product specifications:
Table 1 – Accelerometer Key Specifications
The acceleration data is sampled by a 12 bit analog to digital converter at rates ranging from 30 Hz to
100 Hz (user selectable) and stored in a raw, non-filtered/accumulated format in the units of gravity
(G’s). This data is stored directly into a 256 or 512 MB non-volatile flash memory.
Ambient Light
Ambient light data is sampled and stored to memory at a 1 Hz rate. When a downloaded data file is
converted into an accumulated *.agd format with epoch lengths greater than one second, the lux values
for that epoch are averaged. An estimate of lux values is shown in Table 1.
Interpretation Comparison
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