The linearity is defined as the ability to reproduce the input characteristics symmetrically and linearly.
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A measure of the departure from a straight-line response in the relationship between two quantities, where the change in one quantity is directly proportional to a change in the other quantity. Usually expressed as a maximum percent. Rotational displacement in analog meters, particularly for low-level measurements and/or AC parameters, is distinctly non-linear with respect to changes in the quantity under measurements; accuracy in these cases is maintained by means of properly calibrated non-linear scale cards.