Calibration required by:
ISO 9001: 1994 clause 4.11 species that:
The supplier shall…maintain documented procedures to…calibrate and
maintain equipment…equipment shall be used in a manner which ensures that
the measurement uncertainty is known…
The supplier shall…identify equipment that can affect product quality,
and calibrate and adjust at prescribed intervals, or prior to use...
ISO/IEC 17025 clause 5.5.2 specifies that:
Equipment and its software used for testing…shall be capable of
achieving the accuracy required and shall comply with specifications…
Calibration programmes shall be established for key quantities and
values of the instruments where these properties have a significant effect
on the results…
Before placed into service, equipment…shall be calibrated and checked
to establish that it meets the laboratory’s specification requirements…and
shall be checked and/or calibrated before use.