RH CGS-240, Manual

Page: 144 / 148

RHS Plateau Software
CGS-240 Manual 6/15/2021
Page 144 of 148
Figure 5.29
Figure 5.30
When the UUT has been evaluated for plateaus and the
Plateau table has been filled you will notice that there are
now enabled input boxes where before they were disabled,
with a default value of 0.0 (as shown in Figure 5.29).
Fill in a manual reference value for each of the plateaus that
are going to be used to calibrate the data, shown in Figure
5.30. Once this is done move on as normal to the
Calculating
Calibration Coefficients section.
10.6 CALCULATING CALIBRATION COEFFIC IENTS
Once the desired plateaus have been selected, and the manual reference values are filled in if applicable, the
coefficients are ready to be calculated.
In order to calculate the coefficients, the equation type must first be selected, as shown in Figure 5.28. There are
currently three options:
•
CVD : Callendar-Van Dusen resistance-temperature equation
𝑅 = 𝑅
0
(1 + 𝐴 ∗ 𝑡 + 𝐵 ∗ 𝑡
2
+ 𝐶 ∗ (𝑡 − 100) ∗ 𝑡
3
)

for temperatures below 0 °C
𝑅 = 𝑅
0
(1 + 𝐴 ∗ 𝑡 + 𝐵 ∗ 𝑡
2
)

for temperatures at and above 0 °C
Where 𝑅 is the thermometer resistance (in ohms) and 𝑡 is the thermometer temperature (in °C).
•
ITS-90
•
Polynomial : User option of 1
st
, 2
nd
, or 3
rd
order polynomial