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How to Know the Parameters of the Accelerometer
Working principle
The working principle of accelerometers is based on the relationship between mass and force. It uses the acceleration generated by the mass under the force to measure the acceleration of the object. Common accelerometers use micro electromechanical systems (MEMS) technology to measure the acceleration of an object through tiny force sensors.
The main parameters of the accelerometer. Taking ERICCO‘s quartz accelerometer ER-QA-03A as an example, the meaning of the main parameters is briefly described.
Measurement Range
Refers to the acceleration range that the accelerometer can measure. The larger the value, the stronger the ability to measure the magnitude of acceleration. The measurement range should be reasonably selected for different applications. Because the measurement range is large, the sensitivity will be correspondingly reduced, unless a higher precision is selected.For the ER-QA-03A series, the measurement range of ER-QA-03A1 ER-QA-03A2 ER-QA-03A3 is ±50g.
It specifies the device output when the measurement axis acceleration is 0g. It can be given as a voltage value (analog output device), or in LSB (digital output device), or in mg. It can be understood as a static error that does not fluctuate over time. The user can directly subtract 0g Bias from the measured value for compensation. For example ER-QA-03A1 bias is ≤ (±3)mg.
Sensitivity refers to the relationship between the voltage or digital signal output by the accelerometer and the actual acceleration. It is usually expressed in mV/g or LSB/g (the unit of minimum discernable acceleration). The higher sensitivity means the accelerometer is able to measure acceleration more accurately.
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