ILX Lightwave LDT-5525 User Manual page 50

You must create a data file for your thermistor that describes the resistance at various temperatures. The temperature
verses resistance calibration data can be obtained from the thermistor manufacturer. Enter the resistance at various
temperatures as data points into an ASCII file. You can write the data file on a word processor, but you must use
non-document mode so special word processing characters are not inserted into the data file. Format the data with
one temperature-resistance pair per line and at least one space separating the two numbers. Temperatures should be
in centigrade and resistances in ohms. For an accurate determination of the coefficients, we recommend that you use
at least twenty data points uniformly spread over the intended range of use. Enter a -1 to signify the end of the
resistance data and temperature data.
A small sample data file is included below as an example of the data format and end-of-data marker (R = -1).
Temperature
-20
-10
0
10
20
25
30
40
50
-1
Run the STEIN1 program. The best curve fitting values for C1, and C2 will be displayed. Enter these numbers into the
LDT-5525 Temperature Controller.
Resistance
97072
55326
32650
19899
12492
10000
8056.8
5326.4
3602.3
-1
A-4