A Calibration Of Test Equipment A General

(1) All measurements necessary for the performance of tests should be traceable, to standards of measurement through an unbroken chain of calibrations. The number of links in the chain of calibrations should be no greater than is necessary to achieve the required accuracy. (2) Measuring instruments and test equipment should be calibrated or re-calibrated either by a national accredited external organisation, or in-house by the laboratory's own staff using calibrated reference standards. (3)...