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MAN-039-1-1
Differential EMG Sensing
Trigno sensors support, low noise, high fidelity sensing head for detecting EMG
(electromyographic) biofeedback signals from the surface of the skin when
muscles contract. The sensor bandwidth can be selected between 10-850Hz or
20-450 Hz and the input range of the sensor can be selected between 22mV or
11mV depending on user needs. Quattro and Duo sensors can be used to look
at more than one muscle or different regions of the same muscle at the same
time, from the single sensor.
Inertial Measurement Unit
Trigno sensors have a built-in 9 DOF inertial measurement unit which can relay
acceleration, rotation and earth magnetic field (compass) information. Users
can use this information to discern movement activity time-synchronized with
the EMG signals. One of 4 ranges can be selected for each sensor to span ±2g
to ±16g for accelerometer outputs and ±250°/s to ±2000°/s for gyroscope
outputs. The sensor is capable of estimating orientation in 3D space from the 9
channels of information.
Dual Mode “BLE-Base” Communication
Trigno sensors are capable of communication with a PC-connected Base station
using the Trigno custom wireless communication protocol, or with Android
devices using the Bluetooth Low Energy (BLE) industry standard protocol. Note
that the information bandwidth when operating over Bluetooth is limited by
the Bluetooth protocol and the host device capabilities.
Wireless Communication
The Trigno wireless communication scheme offers robust data transmission for
up to four quattro sensors operating in full bandwidth mode, with a nominal
distance of 20m. Under optimal environmental conditions (no RF path
obstructions or interfering sources), this nominal distance can be notably
superseded. Up to 16 sensors (64 EMG channels if using Quattro) can be
serviced by the system depending on data sampling requirements.
Data Synchronization
Data from each sensor and from each channel within a sensor are time
synchronized over the Trigno wireless communication protocol so no time skew
between data exists. A maximum of 16 sensors can stream data to a host base
station at one time. These features are available only when communicating with
the PC-connected Base Station; the Bluetooth/BLE protocol does not guarantee
latency.
Rechargeable Battery
Sensors contain a sealed rechargeable lithium polymer battery for continuous
use which can be extended when making use of low power modes. Actual
duration will depend on usage conditions, which are expected to vary between
2 to 6 hours of performance. Charge status is conveniently reported through
the wireless communication protocol.
