**Marcus Flack**

The expanded uncertainty is the standard uncertainy multiplied by the coverage factor. The S1 paramater is an uncertainty component of U2 based on the standard deviation of the UUT measurements. The value of F is used to properly weight the S1 component relative to its number of samples assuming that the measurements follow a normal distribution pattern. Does this answer your question?

Note that the S1 value cannot be determined with only 1 measurement. NMEAS = 3 or more should be used to get a meaningful value for S1. You can override S1 and or U2 by using the VSET FSC.

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