SOME ASPECTS OF MEASUREMENT UNCERTAINTY CALCULATION IN GAUGES BLOCK CALIBRATION
Gauge block calibration is one of the oldest high precision calibrations made in dimensional metrology. Measurement Assurance Method determine calibration or measurement uncertainty based on systematic observations of achieved results. All length measurement processes are comparative operation, directly or indirectly. A comparator is device for measuring difference. The unknown length of a block is determined by measuring the difference between it and a reference block of the same nominal size and then calculating the unknown length. Measurement process is continually affected by perturbations from variety of sources. The uncertainty in the result of measurement generally consists of several components which may be grouped in two categories according to the way in which their numerical values are estimated: A-those which are evaluated by statistical methods and B-those which are evaluated by other means.