ILX Lightwave LDT-5525 User Manual page 49

k Ω
Once the constants A' and B' are determined, the LDT-5525 Temperature Controller is programmed with the following
values of C1, and C2:
C1 = A' * 10
C2 = B' * 10
Computer program
We have included a computer program called STEIN1 that uses a least squares curve fitting routine to determine the
values of C1 and C2. The program is written in IBM's advanced BASICA.
THERMISTOR R/T CURVES
FOR VARYING ROOM TEMP. RESISTANCES
50.00
40.00
30.00
20.00
1 k 2.5 k 5 k
10.00
0.00
-60 -40
0
-20
TEMPERATURE (DEGREES C)
Figure A.1 Thermistor Resistance Versus Temperature
+3
+4
10 k 25 k 50 k
100 k
60 80
20 40 100
A-3
120 140 160