1.1 The needs of Calibration

• It is obvious that measurement is vital importance to determine and maintain quality. 
• To produce quality measurement, one must make sure that the measuring equipment are properly maintained and regularly calibrated. 

What is calibration?

• Calibration is the accurate measurement and comparison of an instrument's input and output to a known standard.
• Instrument error can be identified and corrected. 

Why Calibrate?

Certain factor have to be considered before deciding and finalising whether an inspection or measuring instruments requires calibration or not. 

• What are the tolerance/acceptance criteria? 
• What is the level of accuracy does the measurement need to be?
• Does the outcome of the measurement decide the product acceptance/rejection?

The Importance of Recalibration

Instrument may require recalibration for a number of reasons:

• Overtime method, material, man, machine and environment condition can affect the instrument calibration.
• Calibration is usually necessary after any extended period of usage.