Calibration Systems Requirements (Metrology)

3.15.
The calibration and checking of measurement tools and instruments are critically important.
The reliability, accuracy, and precision of any inspection measurement relies on the correlation
between the measuring devices and the master or standard. We need exacting methods, procedures
and equipment for verifying the various dimensional elements of the measuring instruments and
gauges.
A calibration laboratory should be designed to furnish the following:
(i) Traceability of measurement
(ii) Proper environment
(iii) Appropriate measuring equipment
(iv) Standard measuring procedures consistent to the state of the art.
The standards established for calibrating the measuring instruments used in controlling
product quality should have the capabilities for accuracy, stability and range required for the
intended use. Environmental control, giving due consideration to temperature, humidity, vibration,
cleanliness and other controllable factors affecting precision measurements is essential.
The calibration laboratory must maintain a set of standard procedures showing the equip-
ment required to calibrate, control requirements, a step by step procedures on how to make the
actual calibration and disposition of gauges.
Maintenance of records of calibration of all devices is essential. Each instrument and gauge
should be given a specific serial number.