ICP DAS USA tM-TH8 User Manual page 23

1. Ask the manufacturer. Usually, thermistor manufacturers
publish data for the Steinhart Coefficients for their thermisotr
products.
2. Solve the coefficients by using three known data sets: (R1,
T1), (R2, T2) and (R3, T3), which can be obtained by
referring to the published Resistance versus Temperature data
table of the thermistor. They can be obtained by measurement
if no published data table is available. In order to achieve the
most accurate results, the following values are recommended:
-40°C ≦ T1, T2, T3 ≦ 150°C and
|T2 – T1| ≦ 50°C, |T3 – T2| ≦ 50°C.
The DCON Utility, available for downloaded from the ICP DAS
website (http://www.icpdas.com), can assist with the calculation
of the Steinhart Coefficients and the conversion to IEEE-754
format. Documentation for the DCON Utility can be found in
the "Getting Started For I-7000 Series Modules" manual.
tM-TH8 User Manual, Rev: A1.1 7MH-018-A11 23