Uncertainty

ui	Uncertainty sources	Distribution	Formula in squared
	Basic uncertainties
1	Reference sensor uncertainty taken from its calibration certificate	Normal	(x/2)^2
2	Reference sensor long time drift after calibration	Rectangle	(x/SQRT(3))^2
3	Reference sensor resolution and reading error	Rectangle	(x/SQRT(3))^2
4	Hysteresis	Rectangle	(x/SQRT(3))^2
5	Cal sensor resolution and reading error	Rectangle	(x/SQRT(3))^2
6	Drift of ref sensor readings	Variation width
7	Drift of cal sensor readings	Variation width
6 or 7	Max drift from 2 values above	Variation width	(MAX([6],[7])/(2*SQRT(3)))^2
	Other uncertainties
8a	Temp drift reference sensor, ± x ° C	Rectangle	(x/SQRT(3))^2
8b	Temp drift measuring object, ± x ° C	Rectangle	(x/SQRT(3))^2
8c	Repeatability	Rectangle	(x/SQRT(3))^2
9	Uncertainty ui	ui = SQRT of sum	Sum of squared column

Total measurement uncertainty (k=2) is calculated as 2*ui and rounded to 2 digits after coma.

If the result is smaller than 0.2 then 0.2 is reported on the certificate.