© 2009-2010; Rotronic AG
42
E-M-HG2-S-V1_02
Appendix 3
HygroGen Uncertainty Framework - Chilled Mirror Reference
23
°C
50
% rh
Temperature sensitivity
3.1
% rh/deg C
Reference Uncertainty source
Distribution
Value
Units
Sensitivity
Equiv rh
Divisor One SD
Squares
1
Uncertainty of chilled mirror reference
normal
0.200000
°C
3.100000
0.620000
2.00
0.310
0.096
2
Repeatability of humidity
normal
0.100000
%rh
1.000000
0.100000
1.00
0.100
0.010
3
Chamber temperature gradients
rectangular
0.020000
°C
3.100000
0.062000
1.73
0.036
0.001
4
Temperature stabilisation
rectangular
0.005000
°C
3.100000
0.015500
1.73
0.009
0.000
5
Repeatability of temperature
normal
0.050000
°C
3.100000
0.155000
1.00
0.155
0.024
6
Humidity stabilisation
rectangular
0.050000
%rh
1.000000
0.050000
1.73
0.029
0.001
7
Humidity fluctuations
rectangular
0.050000
% rh
1.000000
0.050000
1.73
0.029
0.001
8
Instrument under test (IUT) resolution
rectangular
0.050000
% rh
1.000000
0.050000
1.00
0.050
0.003
9
Standard deviation of Ref readings
normal
0.050000
%rh
1.000000
0.050000
1.00
0.050
0.003
10
Standard deviation of IUT readings
normal
0.100000
%rh
1.000000
0.100000
1.00
0.100
0.010
Reference
Sum of squares
0.15
1
See sheet Dew Point UA
Standard uncertainty (√
sum of squares)
0.385
2
From Standard Deviation of 10 repeated calibration runs
Expanded uncertainty (95 % confidence)
0.77
3
Measured temperature gradients from the Rotronic HygroGen Service
4
Measured stability from the Rotronic HygroGen Service
5
From Standard Deviation of 10 repeated calibration runs
6
Resolution of Rotronic HygroGen Control Clip
7
Resolution of Rotronic HygroGen Control Clip
8
Resolution from manufacturers specification
9
Standard Deviation of Ref readings during calibration
10
Standard Deviation of IUT readings during calibration
