ActiGraph wGT3X-BT User Manual
Also see for wGT3X-BT: User guide
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www.theactigraph.comP a g e | 1049 E. Chase St. Pensacola, FL 32502 tel 850.332-7900 fax 850-332-7904IntroductionThe wGT3X-BT activity monitors provide objective measurements of human activity and are used inmany research and clinical applications. They include a microelectromechanical system (MEMS) basedaccelerometer, ambient light, and a touch sensor as data collection end points. No formal training isrequired to use the wGT3X-BT device and patients may be the intended operator. This document willserve as the only necessary training guide needed to get full functionality from the device.Specifications and Functionality of the wGT3X-BTDataThe devices include both an acceleration sensor as well as an ambient light sensor. Data will not benegatively affected by lint, dust, or direct sunlight.AccelerationThe devices include an acceleration sensor that consists of a microelectromechanical systems (MEMS)accelerometer yielding the following product specifications:Parameter Value UnitsAxis 3Sensitivity 4 mg/LSBDynamic Range +/- 8 gTable 1 – Accelerometer Key SpecificationsThe acceleration data is stored at rates ranging from 30 Hz to 100 Hz (user selectable) and stored in araw, non-filtered/accumulated format in the units of gravity (g’s). This data is stored directly into a non-volatile flash memory. The accelerometer is very sensitive and is accurate within +/- 0.5% of the datacollected.Ambient LightAmbient light data is sampled and stored to memory at a 1 Hz rate. When a downloaded data file isconverted into an accumulated *.agd format with epoch lengths greater than one second, the lux valuesfor that epoch are averaged. An estimate of lux values is shown in Table 1.Lux Level Interpretation Comparison1 Twilight50 Family living room |
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