ROTRONIC Hygrogen2 - Manual (Page 72)

9
D1: HygroGen2 Uncertainty Framework - Internal 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 Temperature stabilisation rectangular 0.005000 °C 4.960000 0.024800 1.73 0.014 0.000
7 Repeatability of temperature normal 0.050000 °C 4.960000 0.248000 1.00 0.248 0.062
8 Humidity stabilisation rectangular 0.050000 %rh 1.000000 0.050000 1.73 0.029 0.001
9 Humidity fluctuations rectangular 0.050000 % RH 1.000000 0.050000 1.73 0.029 0.001
10 Instrument Under Test (IUT) Resolution rectangular 0.050000 % RH 1.000000 0.050000 1.00 0.050 0.003
11 Standard deviation of Ref readings normal 0.050000 %rh 1.000000 0.050000 1.00 0.050 0.003
12 Standard deviation of IUT readings normal 0.100000 %rh 1.000000 0.100000 1.00 0.100 0.010
Reference Sum of squares 0.63
1
From calibration certificate - check uncertainty at input
values
Standard uncertainty (√ sum of
squares)
0.793
2 From Standard Deviation of 10 repeated calibration runs
Expanded uncertainty (95 %
confidence) 1.59
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 Measured stability from the ROTRONIC HygroGen2 Service
7 From Standard Deviation of 10 repeated calibration runs
8 Resolution of ROTRONIC HygroGen2 Control Clip
9 Resolution of ROTRONIC HygroGen2 Control Clip
10 Resolution from manufacturer’s specification
11 Standard Deviation of Ref readings during calibration
12 Standard Deviation of IUT readings during calibration