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User Guide 2020-12-14 / R78
1 INTENDED USE
Movesense MD sensor is intended to be used as an ECG and motion signal
measurement device, which sends the measured signals to other devices for
analysis. Movesense MD extracts R-peaks from the recorded ECG signal with
a modified Pan-Tompkins algorithm, allowing R-R interval measurement and
successive heart rate calculation. Movesense MD does not analyze the measured
signals for abnormalities, such as arrhythmias, but sends the signals to the host
device as registered. Thus, Movesense MD does not provide direct diagnosis,
but it provides data for host device to allow further processing. The final signal
interpretation and diagnosis is the responsibility of a certified physician.
Movesense MD sensor does offer programmability and a possibility to run custom
algorithms, which can be developed and verified by the OEM1 3rd party integrator
utilizing the Movesense MD sensor as a component in their system, which the
OEM in question would have separately approved.
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Movesense MD sensor does not have other user interface than a red indicator
LED, controllable by software, and the signal data is not directly visually readable
from the sensor. A host device, for example a mobile phone or a tablet computer,
is needed to analyze, read and show the measured signal data.
Movesense MD sensor is able to measure the following signals:
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Single channel ECG waveform
o Sampling frequency: 128/256/512Hz
o Measurement bandwidth: 0.5Hz-40Hz as defined in IEC60601-2-47
o Dynamic range 60mVp-p, max offset: 500mV, resolution: 15 bits
o Heart rate: 20BPM-240BPM, resolution: 1BPM, accuracy: ±1BPM
o R-R intervals: 200ms-2000ms, resolution: 1ms, timing accuracy: ±1ms
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Modified Pan-Tompkins algorithm used for R-peak detection
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Motion (16 bit output resolution)
o Acceleration
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±2/±4/±8/±16g, output unit: m/s2, accuracy: ±2%
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12.5/26/52/104/208Hz sampling frequency
o Angular velocity
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±125/±245/±500/±1000/±2000°/s, output unit: °/s, accuracy: ±2%
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12.5/26/52/104/208Hz sampling frequency
o Magnetic field2
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±49 gauss, 1.5±10% mgauss /LSB, output unit: mgauss
1 Original Equipment Manufacturer
2 Due to the inherent nature and behavior of the magnetometer measurement circuitry in the vicinity of local
ferromagnetic objects (i.e. the battery), the magnetometer output signal is not linear. The magnetometer is mainly
meant to be used for gyroscope drift compensation in inertial measurement (IMU) application. If the use case
requires absolute magnetic field strength value measurements, an application specific calibration procedure must
be implemented, to the extent considered necessary, in the client application.
