Thermistor Measurement Circuits; Figure 4-5. Thermistor Measurement With Constant Current Excitation - National Instruments Module SCXI-1503 User Manual

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Figure 4-4. Resistance-Temperature Curve for a 2,252
The thermistor has been used primarily for high-resolution measurements
over limited temperature ranges. However, continuing improvements in
thermistor stability, accuracy, and interchangeability have prompted
increased use of thermistors in a variety of applications.

Thermistor Measurement Circuits

This section details information about thermistor measurement circuits.
The most common technique is to use a current-source, and measure the
voltage developed across the thermistor. Figure shows the measured
voltage V equals R
0 T
V

Figure 4-5. Thermistor Measurement with Constant Current Excitation

I .
EX
I
EX
+
0
–
V = I x R
0 EX T
4-11
Chapter 4 Theory of Operation
Thermistor
R
T
Thermistor
SCXI-1503 User Manual