NTC calibration and multiple temperature sensors: Difference between revisions
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Revision as of 16:06, 6 September 2023
Introduction
Calibration of NTC sensors and different
NTC
Note that the temperature of the sensor rises when the current supplies through the resistor. The NTC is nonlinear; see below Calibration.
Negative Temperature Coefficient, NTCLE100E3101JB0 or similar (MF52B NTC Thermistor). The NTC is connected in series with a "shunt" resistor , see Measurement of resistors: voltage divider. Usually is used. The total resistance of the circuit is , which gives
or
depending on the circuit. So check the circuit.
Calibrating: Steinhart-Hart Equation
A nonlinear Steinhart-Hart equation is widely used
The parameters , and can be obtained, if the resistance of three (3) temperatures is known.
Calibrating using known datapoints
Though the NTC sensor is nonlinear, locally it will be linear. Thus by using some known datapoints the temperature can be estimated.