I have an observation, and question, regarding the way in which DMIS
reports deviation from nominal (when the nominal is negative).
The reports I have been producing are not what I expect, and don't agree with the output from my other CMM. (see example).
Nominal = -593.7
Actual = -592.4
Dmis shows a Deviation = -1.3

Shouldn't the deviation be +1.3 because the position is closer to
zero? I am not requesting a length and that is what it is showing.

The only information that I can find is on page #345 of the DMIS spec. showing the calculation for "amount out of tolerance".

"AMT (= actual - (nominal + tolerance)"

My question is, is there any way to reverse the deviation output in DMIS, or is there another definition of deviation that I'm not aware of?

Thanks

Ian Price