Sensor Circuits
Calibration of a Thermistor
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Calibration of a Thermistor: A Guide for Sensor Circuits, Summaries of Embedded Wireless Sensors
A comprehensive guide to calibrating thermistors, a type of temperature sensor. It covers the importance of calibration, explains the concept of ntc (negative temperature coefficient) thermistors, and outlines the steps involved in calibrating a thermistor using the steinhart-hart equation. The document also discusses the use of standard references for calibration and provides practical examples of calibration points.
Typology: Summaries
2021/2022
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Sensor Circuits
Calibration of a Thermistor
The need to calibrate sensors
Calibration verifies the precision and reproducibility of measurement instruments, such as sensors and measuring systems. Sensors that are calibrated are the prerequisite for precise, reliable and reproducible measurement results.
Standard Reference
If it is important to get accurate readings in some standard units, you will need a Standard Reference to calibrate against. This can be: A calibrated sensor A standard physical reference Temperature Sensors Boiling Water - 100 °C at sea-level Ice-water Bath - The "Triple Point" of water is 0.01°C at sea-level
NTC Calibration
Where ln R is the natural logarithm of the resistance at temperature T in
Kelvin, and A, B and C are coefficients derived from experimental
measurements.
NTC Calibration
The Steinhart-Hart coefficients A, B, and C can be obtained by solving the above matrix equation: A = 1.1384× 10 - 3, B=2.3245× 10 - 4, C=9.489× 10 - 8. The LDC501 uses these three coefficients to convert resistance into temperature. How to get these values Put your thermistor in ice water, boiling water, and room temperature. Use a standard meter to measure your sensor resistances and temperatures.