component

Source of uncertainty

probability distribution

a (% RH)

k

Free degree

reliability

Component value (% RH)

u_A

Type A standard uncertainty

Normal

——

——

9

——

0.0069

u₁

Resolution of standard sensor

Uniformity

0.005

1.732

∞

100%

0.0029

u₂

Accuracy of standard sensor

Normal

0.500

2

12.5

80%

0.2500

u₃

temperature and humidity control box

Fluctuation

Arcsine

0.745

1.414

12.5

80%

0.5268

u₄

Uniformity

Uniformity

0.418

1.732

12.5

80%

0.2416

u₅

Resolution of measuring sensor

Uniformity

0.005

1.732

50

90%

0.0029

u₆

Error of collector channel

Normal

0.050

2

50

90%

0.0250

u₇

Rounding error

Uniformity

0.050

1.732

50

90%

0.0289