Acceleration - Highpass 0; Low pass limited to 10.5 Hz, and sampled at 18 Hz. The maximum and minimum measured in each second are reported.
Temperature - Stabilizes to a new reading, following a step change, in 900 ms; the reporting rate is 1 Hz.
Posture - Highpass 0. Based on the accelerometer with a 6.5 Hz low pass filter to limit the noise resulting from movement and provide a stable reading.
Activity - requires the magnitude of the AC components of each axis; uses a digital 0.1 Hz highpass filter and a 10.5 Hz lowpass hardware filter. Sampled at 18 Hz and accumulated for 1 second reporting.
Respiration - Detect breathing rates from 3 BPM to 70 BPM (0.05 Hz to 1.166 Hz)
ECG - In hardware, the signal is filtered with a highpass filter at 15 Hz and a low pass filter at 78 Hz. The low end filter cut-off enables heart rate measurement under vigorous activity (high resistance to motion artifact). The sample frequency is 250 Hz, which is also the reporting rate over RF (not reported in logged data).
The BioHarness is not recommended for heart rate variability studies because the sample rate used to record the ECG waveform is at the very low end of the optimal range for HRV studies.
Smart Fabric Strap
Chest Strap: Adjustable, Velcro® fastening
Material: Elasticized webbing incorporating Zephyr Smart Fabric sensors
Width: 50 mm
Weight: 50 grams
Size: BioHarness ships with a medium strap (no substitutions). Additional straps are available for individual purchase or in 5 packs (one size) or 50 packs (mix sizes).
- Small 66 - 82 cm (26" to 32.5")
- Medium 82 - 99 cm (32.5" to 39")
- Large 99 - 115 cm (39" to 45.5")
- Extra Large 115 - 132 cm (45.5" - 52.0")
BioHarness Transmitter/Logger
Frequency ISM radio band (868 - 929 MHz); Frequency is software configurable for country-specific bands
Sample Rate 250 Hz Max.
Memory Capacity ~480 hours
Transmit Range Up to 100 m, environment and antenna dependent
Weight 35 grams
Dimensions 80 x 40 x 15 mm
Battery Life
~ 5 hours transmitting
~ 8 hours logging
Charging is intelligent - the device cannot be overcharged
Operating System: Windows® 7 or Vista
Connectivity: USB
Compliance: This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
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This device may not cause harmful interference.
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This device must accept any interference received, including interference that may cause undesired operation.
BioHarness™ is a trademark of Zephyr Technology Limited. | 
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