Monnit Vibration Meters use an accelerometer to measure g-force on 3 axes and then determines speed and frequency from this measurement. The sensor measures vibration once every Measurement Interval, which can be set as low as 1 minute and as high the Heartbeat Interval. The sensor is designed to measure continuous vibration and be low powered so it captures vibration for less than a second during its Measurement Interval. The sensor uses a Sensitivity Threshold to filter noise or low level vibrations. If this threshold is set to 0 then any vibration captured during the Measurement Interval will contribute to the duty cycle and will be analyzed, even very low level vibrations. The Vibration Meter will also report the duty cycle, or how long the sensor was measuring vibrations throughout the heartbeat.
* Actual range may vary depending on environment.
** Battery life is determined by sensor reporting frequency and other variables.
|Speed Measurement Range||0 to 25.5 mm/s|
|Speed Measurement Resolution||0.1 mm/s|
|Frequency Measurement Range||0 to 256 Hz|
|Frequency Measurement Resolution||1.5625 Hz rounded down to nearest 1 Hz|
|Vibration Intensity Threshold Range||0 to 1.701 g|
|Vibration Intensity Threshold Resolution||0.063 g|
|Security||Encrypt-RF® (256-bit key exchange and AES-128 CTR)|
ALTA AA Specifications
|Battery Type||2 Replaceable AA 1.5 V Batteries|
|Dimension||4.375 in x 2.470 in x 1.12 in|
|Supply Voltage||2.0 - 3.8 V (2 x AA 1.5V Batteries or Optional Power Supply)|
|Battery Life||At 1 hour heartbeat setting, included AA batteries will typically last 6-8 Years. **|
|Max Operating Temperature Using AA Alkaline||-18°C to 55°C (0°F to 130°F)|
|Max Operating Temperature Using AA Lithium||-40°C to 60°C (-40°F to 140°F)|
|Optimal Battery Operating Temperature||+10°C to +50°C (+50°F to +122°F)|
ALTA 940 MHz Korea Specifications
|Operating Frequency||940.0 MHz - to 946.0 MHz Range|
|Device Range||Device Range Up to 1,200 ft. non-line-of-sight, wireless device range*|
|Security||Encrypt-RF® (Diffie-Hellman Key Exchange + AES-128 CBC)|