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How do you find the temperature coefficient of a thermistor?
The Steinhart-Hart equation is: 1/T = A + B(lnR) + C(lnR)2 + D(lnR)3 + E(lnR)4… A, B, C, D, and E are the Steinhart-Hart coefficients that vary depending on the type of thermistor used and the range of temperature being detected.
What is thermistor Where is it used?
Thermistors are used as temperature sensors. They can be found in every day appliances such as fire alarms, ovens and refrigerators. They are also used in digital thermometers and in many automotive applications to measure temperature.
What is the beta value of a thermistor?
A thermistor’s “b” value, or beta value, is an indication of the shape of the curve representing the relationship between resistance and temperature of an NTC thermistor.
How to get the temperature from a thermistor?
Once you have converted the voltage to an ADC representation, there are a number of ways to get the actual temperature from the thermistor’s V Sense voltage. The most common method uses a look-up table (LUT), also known as a resistance table, normally provided by the thermistor manufacturer.
Which is the closest value to thermistor resistance?
Where X is the known value of thermistor resistance, Y is the unknown value of temperature, X1 and Y1 are the closest values lower than the known resistance for resistance and its associated temperature, and X2 and Y2 are the closest values higher than the known resistance for resistance and its associated temperature.
How are NTC thermistors used in temperature sensing?
If we reversed the positions of the series resistor, R S and the thermistor, R TH, then the output voltage would change in the opposite direction, that is the hotter the thermistor gets, the higher the output voltage. We can use NTC thermistors as part of a basic temperature sensing configuration using a bridge circuit as shown.