D4: dew point uncertainty analysis – ROTRONIC Hygrogen2 User Manual
Page 75
D4: Dew Point Uncertainty Analysis
Dew Point Temperature
-5 to +35
°Cdp
Reference Uncertainty source
Distribution Value Units Sensitivity Equiv °Cdp Divisor
One SD
Squares
1
Calibration of Standard
normal
0.1 °Cdp
1
0.10
2.00
0.050
0.00250
2
Drift of Standard
rectangular
0.1 °Cdp
1
0.10
1.73
0.058
0.00333
3
Repeatability
normal
0.05 °Cdp
1
0.05
1.00
0.050
0.00250
4
Mirror Contamination
rectangular
0.05 °Cdp
1
0.05
1.73
0.029
0.00083
5
Mirror Temperature Fluctuations
rectangular
0.05 °Cdp
1
0.05
1.73
0.029
0.00083
6
Temp Gradients Across the Mirror/Condensate
rectangular
0.01 °Cdp
1
0.01
1.73
0.006
0.00003
9
Standard Deviation of Readings
normal
0.01 °Cdp
1
0.01
1.00
0.010
0.00010
Sum of squares
0.01
Standard uncertainty (√
sum of squares)
0.101
Expanded uncertainty (95% confidence)
0.20