SOME NOTES ON REPLICATED MEASUREMENTS IN METROLOGY AND TESTING: CLASSIFICATION INTO REPEATED OR NON-REPEATED MEASUREMENTS

摘要

Replication of measurements and the combination of observations are standard and essential practices in metrology. They are done with different methods to match distinct purposes: (a) When done on the same standard, to obtain a statistics allowing to assess the repeatability of the value of standard; (b) When done on the same standard, to check for the influence on the total uncertainty arising from the variability of the influence parameters affecting the standard, including dependence on time. The checks allow recording the day-today standards history; (c) When done on several standards of the same Laboratory, to check if they have the same value or to establish the differences between their values, and evaluate the associated uncertainty.