请参照CTL OP-111 6.2.1有明确定义 6.2 Calibration Intervals for Test Equipment Requiring Calibration 6.2.1 All test equipment requiring calibration shall undergo an initial calibration before being put into service. Thereafter, the maximum nominal calibration interval shall be: a) One year for electrical, electronic and mechanical test equipment. b) Three years for mechanical test equipment made of solid materials not subject to deterioration. c) As recommended by the manufacturer of the instrument. d) Test equipment that is "fail safe" in that failure would be evident to a user (with laboratory procedures requiring the user to check the equipment before use) may be put on the status of "Initial Calibration Only (ICO)". Examples of the equipment that can be placed on ICO status are: steel rules, tape measures, weights 4,5 kg or more calibrated to +/-1% tolerance, single piece steel probes greater than or equal to 3 mm diameter with blunt ends, graduate cylinder, thermometers, steel impact balls, steel or plastic probes with no Moving parts and sufficient structural integrity so as to not deform.
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