ROTRONIC Hygrogen2 User Manual
Page 73
D2: HygroGen2 Uncertainty Framework - External RH Probe
Input values:
23
°C
80
% RH
Temperature sensitivity
4.96 % RH/deg C
Reference Uncertainty source
Distribution
Value
Units
Sensitivity
Equiv RH Divisor One SD Squares
1
Uncertainty of reference probe
normal
0.900000
%rh
1.000000
0.900000 2.00
0.450
0.203
2
Repeatability of humidity
normal
0.100000
%rh
1.000000
0.100000 1.00
0.100
0.010
3
Reference drift
rectangular
1.000000
%rh
1.000000
1.000000 1.73
0.577
0.333
4
Reference resolution
rectangular
0.050000
%rh
1.000000
0.050000 1.73
0.029
0.001
5
Chamber temperature gradients
rectangular
0.020000
°C
4.960000
0.099200 1.73
0.057
0.003
6
Gradients through probe stem
rectangular
0.100000
°C
4.960000
0.496000 1.73
0.286
0.082
7
Temperature stabilisation
rectangular
0.005000
°C
4.960000
0.024800 1.73
0.014
0.000
8
Repeatability of temperature
normal
0.050000
°C
4.960000
0.248000 1.00
0.248
0.062
9
Humidity stabilisation
rectangular
0.050000
%rh
1.000000
0.050000 1.73
0.029
0.001
10
Humidity fluctuations
rectangular
0.050000
%rh
1.000000
0.050000 1.73
0.029
0.001
11
Instrument Under Test (IUT) Resolution
rectangular
0.050000
%rh
1.000000
0.050000 1.00
0.050
0.003
12
Standard deviation of Ref readings
normal
0.050000
%rh
1.000000
0.050000 1.00
0.050
0.003
13
Standard deviation of IUT readings
normal
0.100000
%rh
1.000000
0.100000 1.00
0.100
0.010
Reference
Sum of squares
0.71
1
From calibration certificate - check uncertainty at input values
Standard uncertainty (√
sum of squares)
0.843
2
From Standard Deviation of 10 repeated calibration runs
Expanded uncertainty (95 % confidence)
1.69
3
Drift between two successive calibrations of the reference instrument
4
Resolution from manufacturer‘s specification
5
Measured temperature gradients from the ROTRONIC HygroGen2 Service
6
Stem conduction
7
Measured stability from the ROTRONIC HygroGen2 Service
8
From Standard Deviation of 10 repeated calibration runs
9
Resolution of ROTRONIC HygroGen2 Control Clip
10
Resolution of ROTRONIC HygroGen2 Control Clip
11
Resolution from manufacturer‘s specification
12
Standard Deviation of Ref readings during calibration
13
Standard Deviation of IUT readings during calibration