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How is thermistor value calculated?
Thermistor Response to Temperature As with any resistor, you can use the ohmmeter setting on your multimeter to measure thermistor resistance. The resistance value displayed on your multimeter should correspond to the ambient temperature near the thermistor. The resistance will change in response to temperature change.
How do you find the temperature 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 the working principle of a thermistor?
The principle obeyed by the thermistor is its dependency on-resistance values on the change in temperature. The value of resistance can be measured by using an ohmmeter. These are connected in series with the battery and the meter.
What is an output voltage?
The output voltage is the voltage released by a device, such as a voltage regulator or a generator.
The temperature of the thermistor is linearly related to the output voltage (approximately). The design process begins by picking a temperature, which I call the inflection temperature TI , at which we want the flattest possible transfer function ( VOUT / VIN ).
How are PTC and NTC thermistors related to temperature?
Thermistors (thermal resistors) are temperature dependent variable resistors. There are two types of thermistors, Positive Temperature Coefficient (PTC) and Negative Temperature Coefficient (NTC). When the temperature increases, PTC thermistor resistance will increase and NTC thermistor resistance will decrease.
How can I linearize the resistance of a thermistor?
To minimize this difficulty, I often linearize the thermistor’s resistance characteristic by placing the thermistor within a resistor divider. This linearized response is simpler to convert to a temperature value than the thermistor’s raw response.
Which is the flattest possible transfer function in thermistor?
The design process begins by picking a temperature, which I call the inflection temperature TI , at which we want the flattest possible transfer function ( VOUT / VIN ). My design task is to compute values for RS and RP given TI and the resistor ratio µ=VOUT / VIN at TI .
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