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NTC Thermistor Resistance Calculator

How to use the thermistor calculator

  Thermistor is an electronic temperature sensing device whose resistance changes with relative changes in temperature. The name comes from the other two words "thermal resistance".
For temperature measurement and control applications, Negative Temperature Coefficient (NTC) devices are usually used. The "-t°" in the circuit symbol usually indicates an NTC device.
These are very useful for projects connected to a microcontroller. In order to properly use the device to measure temperature, a voltage divider (PD) network is usually an ideal circuit layout

1. Temperature-resistance curve
Enter three sets of data according to actual data, (R1, T1), (R2, T2) and (R3, T3), which need to be measured under different temperature conditions. The best result of data selection points is to select the two end points and the middle point of the temperature range to be tested. For example, if you want to test the temperature between 25 and 85 degrees, select 25, 55, and 85 degrees for the three points.

2. Calculate the temperature coefficient of Steinhart-Hart mode
The thermistor Steinhart-Hart temperature coefficient can calculate the value of A, B, C through the above 3 temperature points. If you directly enter the values of temperature coefficients A, B, and C here, the temperature curve will directly display the new curve based on the values you enter A, B, and C, ignoring the values of the above three points.

3. Calculate the temperature coefficient of B value
The B value is calculated based on the above (R1, T1) and (T2, R2). If you enter the B value here, the curve will directly draw the R-T curve based on the B value and ignore it
Thermistor Calculator - Stanford Research Systems

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