Define linearity of instrument and draw linearity curve

Define linearity of instrument and draw linearity curve
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Answer :

Linearity : It is defined as the ability of an instrument to reproduce the input characteristics linearly and symmetrically. 

(or) 

It is defined as maximum deviation of calibration curve from a straight line drawn between no load and full load output, expressed as percentage of full scale output and measured on increasing load only.

Linearity curve 

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