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- Homework Statement
- I would like to calculate coefficients for the Steinharts-Hart equation but it is alarge system...

- Relevant Equations
- Steinharts-Hart equation

I read about the Steinharts-Hart's equation here and I decided to try and calculate the four coefficients of the

$$\frac{1}{T} = A + B \ln(R) + C \cdot (\ln(R))^2 + D\cdot (\ln(R))^3 $$

Where T is a temperature and R is a resistance of the e.g. NTC thermistor. On the supplied website it is written that:

Well I have chosen my NTC thermistor, found the documentation and took four of the temperature - resistance pairs. Then I tried to calculate the first coefficient, but it is a

I would need someone to quick check for errors. I am not sure my substitutions were made corectly... Do you think I am even on the right track?

**extended**Steinharts-Hart's equation:$$\frac{1}{T} = A + B \ln(R) + C \cdot (\ln(R))^2 + D\cdot (\ln(R))^3 $$

Where T is a temperature and R is a resistance of the e.g. NTC thermistor. On the supplied website it is written that:

Sometimes calculation of coefficients is done using special temperature values. Inserting four value pairs in the range of interest into the extended Steinhart-Hart poylonm leads to a system of linear algebraic equations (Three value pairs for the standard Steinhart-Hart polynom). Temperatures typically used are for example 0° C, 15° C, 25° C and 70° C. By solving this system the values for A, BC and D can be determined.,

Well I have chosen my NTC thermistor, found the documentation and took four of the temperature - resistance pairs. Then I tried to calculate the first coefficient, but it is a

**marathon***(attachment)*!I would need someone to quick check for errors. I am not sure my substitutions were made corectly... Do you think I am even on the right track?