ILX Lightwave LDT-5525 User Manual page 55

THERMISTOR
VOLTAGE
Temperature Resolution
You must also consider measurement resolution since the measurement resolution decreases as the thermistor
temperature increases. A temperature controller (such as the LDT-5525) has a limited measurement resolution. A
temperature change of one degree centigrade will be represented by a greater resistance increase at a lower
temperature than at a higher temperature because of the non-linear resistance of the thermistor. Resolution figures for
a typical 10 K thermistor are given in Table B.3, below.
(USING TYPICAL* 10 k
5.00
4.50
4.00
3.00
2.00
1.00
0.00
-60 -40 -20 0
DEGREES C
* ILX default values for C1 and C2
Figure B.1 Thermistor Temperature Range
B-3
o
Ω
@ 25 C THERMISTOR)
80
20 40 60
µ
10 A
- Denotes practical range with typical 10K thermistor
- Denotes measurable range with typical 10K thermistor
100
µ
100 A