Selecting And Using Thermistors - ILX Lightwave LDT-5412 User Manual

limits given above. If the temperature you want to sample is below 15C you will
need to set the switch to the 10 uA setting, otherwise use the 100 uA setting.

Selecting and Using Thermistors

The type of thermistor you choose will depend primarily on the operating
temperature range. From Figure 5.1 you can also see that 10 K thermistors are
generally a good choice for most laser diode applications where high stability is
required at near room temperatures. Similarly, 5 K thermistors are often a good
choice for detector cooling applications where you want to operate at
temperatures from -30C to room temperature. Much higher or lower temperature
ranges can be controlled through the use of higher or lower resistance
thermistors. For more information on thermistor selection, see ILX Application
Note #2, Selecting and Using Thermistors for Temperature Control.
05_11
(USING TYPICAL* 10 k
5.00
4.50
4.00
3.00
THERMISTOR
VOLTAGE
2.00
1.00
0.00
-60 -20
-40
* ILX default values for C1 and C2
Figure 2.5 Thermistor Temperature Range
O P E R A T I O N
Sensing Current and Thermistor Selection
 o
@ 25 C THERMISTOR)
60
0 20 40
DEGREES C

10 A
- Denotes practical range with typical 10K thermistor
- Denotes measurable range with typical 10K thermisto
C H A P T E R
80 100

100 A
LDT-5412
2
15
