Calibaration may be defined, in general, as the process of determination, by measurment or comparison with a standard, of the correct value of each scale reading or a meter or other measureing insturement: or detetmination of the settttings of a control devicethat correspond to particular values of voltage, current, frequency, pressure, flow or some other output.

In performing a calibaration of an insturemnit, the following steps are neecessary

1. Examine the contruction of the instument and identify and list all the posible inputs.
2. Decide, as best as onc can, whihc of hte inputs will be signigicant in the application of which the insturment is to be calibrated.
3. Procure apparatus that will allow all significant inputs to vary over the ranges considered necessary.
4. By holind some inputs constant, varying others, and recording the output, develop the desired static input-output relations.