calibration

• Definition:

The set of operations that establish, under specified conditions, the relationship between values indicated by an instrument or system for measuring (for example, weight, temperature and pH), recording, and controlling, or the values represented by a material measure, and the corresponding known values of a reference standard. Limits for acceptance of the results of measuring should be established.

•   mainly to minimize the error of any measured value.
• Calibration is an essential of process control that eliminates error before it occurs

•   Objective:

• To determine the difference or the amount of error between known and unknown reading
• Adjust the output of the equipment being measured to bring it to a desired value.