The acceleration level supported by the sensor output signal specification is usually expressed in ± g. This is the maximum acceleration that the device can measure and accurately represent by its output. For example, the output of a ± 3g accelerometer is linearly related to accelerations up to ± 3g. If accelerated to 4g, the output may be invalid. Note that the limit value is specified by the absolute maximum acceleration, not by the measurement range. 4g acceleration will not invalidate the ± 3g accelerometer.
The ratio of changes in acceleration (input) to changes in output signal. It defines an ideal straight line relationship between acceleration and output (the gray line in Figure 1). The sensitivity is specified by a specific power supply voltage. For analog output accelerometers, the unit is usually mV / g; for digital accelerometers, the unit is usually LSB / g or mg / LSB. It is usually expressed as a range (minimum, typical, maximum), or as a typical value plus a percentage deviation (%). For analog output sensors, the sensitivity is proportional to the supply voltage. For example, doubling the power source doubles the sensitivity.
The change in sensitivity due to temperature is generally expressed as a percentage (%) change per ° C. Temperature effects are caused by a combination of mechanical stress and the temperature coefficient of the circuit.
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