Discussion
Hysteresis in a sensor means
Answer: A
Correct answer: The output depends on the direction
Hysteresis means the reading at a given input differs according to whether that input was approached from above or below - the output traces a loop rather than a single line.
The usual causes are mechanical friction, backlash and internal energy losses in the sensing element. It cannot be removed by calibrating at one point, since there is no single correct value to calibrate to; it is quoted as a percentage of span and either accepted or designed out. Drift, noise and saturation are three separate specifications.
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