Measurement Test Critical Value

The Measurement Test Critical Value is a value that Sigmafine applies to measurement corrections (measurement correction divided by reconciled tolerance should not exceed the value shown here). If there is a high degree of redundancy, the value will be 1.0 (the value increases as redundancy increases). A high measurement correction does not necessarily indicate a problem if redundancy is low.

The Measurement Test Critical Value is calculated using the equation:

Where:

ArcErf = inverse normal error distribution function

ZT = confidence set in the Reconciliation Options window. The default is 0.95.

nmeas = number of measurement points in the Model or part of the Model being reconciled

T = number of standard deviations for the instrument tolerance. The default value of 2 is set using the Tolerance box in the Reconciliation Options window.