Accounting for test system measurement uncertainties

The development of approaches to tolerance tiering, introduced to meet the needs of complex weapon systems testing, is examined. Results of a study on the relationship between system measurement uncertainty and pass-fail rates of the test subjects are presented. These results indicate that the strategies adopted for tolerance tiering on any major weapons-system test facility can have important and wide-ranging effects. For the four approaches presented to tolerance tiering, it is shown that each has advantages and disadvantages relative to the others