Total error in the analysis of the pressure sensor, we must first consider the source of an error analysis of the factors that lead to these errors, and then think of ways to reduce these errors, improve the overall performance of the sensor. This article lists the sources of error which affect the pressure sensor performance?
The total error of the pressure sensor, you should use the following definitions of error. Decision you have selected the extent of the pressure sensor-specific error, see this directory specification of the sensor.
In a particular user application, some nominal indicators can be reduced or eliminated, for example, if a pressure sensor is used in the inner half of the predetermined temperature range, then the temperature error can be reduced by half, if the use of the auto-zero techniques, zero offset, and zero drift error can be eliminated.
The zero offset is the same pressure on both sides of the diaphragm of the sensor output.
Span is the algebraic difference between the output endpoint. Usually two endpoints zero and full scale.
The zero point temperature drift is caused by temperature changes of the pressure sensor zero change. Zero offset error is not predictable, because each device can be offset upward or downward change in temperature will cause the entire output curve along the voltage axis offset up or down.
Sensitivity temperature offset is the pressure sensor sensitivity variation caused by temperature changes, temperature changes will cause the change of the slope of the sensor output curve.
The linearity error is at the desired pressure range of the sensor output curve and a deviation of the calibration straight line, a method for computing linear error is the least-squares on the straight line of best fit of the data points from mathematical.
Another method is the the end BP linearity (TBL) or endpoint linearity. TBL decision by a straight line drawn between the data points of the second end (L1) in the output curve. Subsequently a vertical line to the output curve from the line L1, and select the intersecting data points in order to achieve the maximum length of a perpendicular line, the length of the perpendicular line represents the end of BP linearity error.
Repeatability error in the other conditions remain constant, continuous together with any given input pressure deviation in output readings.
Hysteresis error is usually expressed as the mechanical hysteresis and temperature hysteresis combination of error.
The mechanical hysteresis: refers to the output sensor error in one to a given input pressure (increased, decreased different process).
Temperature hysteresis in a temperature cycle before and after the output in the exact input pressure deviation.
The ratio of the amount of change is in the other conditions remain constant sensor output ratio of the power supply voltage, the ratio of the change in error is the change in this ratio, usually expressed as a percentile of the range of the pressure sensor.
Each pressure sensor error sources sum up the above so many, some systematic errors, some random errors, some errors can be eliminated, to find a way to be eliminated through improved technologies, to ensure that the sensor has good output.
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