Answer / rakesh

Hysteresis results from the inelastic quality of an element
or device. Its effect is combined
with the effect of dead band. The sum of the two effects may
be determined directly from the
deviation values of a number of test cycles, and is the
maximum difference between
corresponding upscale and downscale outputs for any single
test cycle. Hysteresis then is
determined by subtracting the value of dead band from the
corresponding value of hysteresis
plus dead band for a given input. The maximum difference is
reported.
The difference may be expressed as a percent of ideal output
span.
Example: The hysteresis is 0.2% of output span.

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