Measurement Process Characterization
2.5. Uncertainty analysis
|Steps in uncertainty analysis - define the result to be reported||The first step in the uncertainty evaluation is the definition of the result to be reported for the test item for which an uncertainty is required. The computation of the standard deviation depends on the number of repetitions on the test item and the range of environmental and operational conditions over which the repetitions were made, in addition to other sources of error, such as calibration uncertainties for reference standards, which influence the final result. If the value for the test item cannot be measured directly, but must be calculated from measurements on secondary quantities, the equation for combining the various quantities must be defined. The steps to be followed in an uncertainty analysis are outlined for two situations:|
|Outline of steps to be followed in the evaluation of uncertainty for a single quantity||
A. Reported value involves measurements on one
|Outline of steps to be followed in the evaluation of uncertainty involving several secondary quantities||
B. - Reported value involves more than one quantity.