Before going into details, let’s define the word “repeat”. Various dictionary definitions include:
- To say or do something over again
- To appear again
- A TV programme shown again
But what does that mean with respect to a pressure sensor?
It defines how good the electrical output is for the same pressure input if tried again and again under the same conditions. For example:
- 1st run – Input 0 increased to 25 psi = Output 4.0V
- 2nd run – Input 0 increased to 25 psi = Output 4.1V
- 3rd run – Input 0 increased to 25 psi = Output 4.0V
Repeatability error is the maximum difference in output when approaching the same point twice from the same direction. The difference between output readings for two or more consecutive pressure cycles to rated range under duplicate conditions, approached from the same (increasing or decreasing) direction.
The repeatability error is not always specified separately, but is usually combined in a total figure including linearity and hysteresis.
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