9. Uncertainty budgets

9. Uncertainty budgets
Uncertainty components are listed in a table along with their corresponding sensitivity coefficients, standard deviations and degrees of freedom. A table of typical entries illustrates the concept.

        Typical error budget of uncertainty components

Type A components Sensitivity coefficient Standard deviation Degrees freedom

1. Time (repeatability) a1 s1 v1

2. Time (reproducibility) a2 s2 v2

3. Time (long-term) a3 s3 v3

4. Instrument correction a4 s4 v4

Type B components

5. Reference standard nominal test / nominal ref s5 v5

6. Physical constant a6 s6 v6

Type A components	Sensitivity coefficient	Standard deviation	Degrees freedom
1. Time (repeatability)	a1	s1	v1
2. Time (reproducibility)	a2	s2	v2
3. Time (long-term)	a3	s3	v3
4. Instrument correction	a4	s4	v4

Type B components
5. Reference standard	nominal test / nominal ref	s5	v5
6. Physical constant	a6	s6	v6