SaM - Steinhart-Hart Relashionship and Different Standard of Thermistor

Remeber:

Similarly to how we can define an RTD with the Calendar Van Dusen Equation, we can describe the equation govering a thermistor using the “Steinhart-Hart Relashionship”, that is:$\frac{1}{T}=a+b\ln (R)+c{\ln }^3(R)$Where the $a,b,c$ coefficients assume these forms:

• $a=\frac{1}{T_A}-\frac{\ln (R_A)}{\beta }$
• $b=\frac{1}{\beta }$
• $c\approx 0$
• $\beta \in \left[3000°\text{K}÷5000°\text{K}\right]$

We have “defined” three types of thermistor:IMPORTANTE

1. Standard precision: $\text{accuracy}\in [0.1°\text{C}÷0.2°\text{C}]$ with $T_{\text{RANGE}}\in [0°\text{C}÷70°\text{C}]$.
2. Extra precision: $\text{accuracy}=0.1°\text{C}$ and large $T_{\text{RANGE}}$.
3. Ultra precision: $\text{accuracy}=0.05°\text{C}$ with $T_{\text{RANGE}}\in [0°\text{C}÷50°\text{C}]$.

Here you can see a comparison between thermistors and RTDs:

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Memory Card

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