How thermistor can be used for temperature measurement?
A thermistor is a resistance thermometer, or a resistor whose resistance is dependent on temperature. The term is a combination of “thermal” and “resistor”. When temperature increases, the resistance increases, and when temperature decreases, resistance decreases. This type of thermistor is generally used as a fuse.
What is the purpose of thermistor?
Thermistors are thermally sensitive resistors whose prime function is to exhibit a large, predictable and precise change in electrical resistance when subjected to a corresponding change in body temperature.
How does the resistance of the thermistor change with 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. Figure 1: Thermistor resistance changes with temperature.
How is temperature measured with NTC thermistors?
Thermistors/Temperature Measurement with NTC Thermistors Resistance. This is the thermistor resistance at the temperature specified by the manufacturer, often 25°C. Tolerance. Indicates how much the resistance can vary from the specified value. Usually expressed in percent (e.g. 1%, 10%, etc).
Is the Steinhart-Hart equation more accurate than the thermistor?
Though not as accurate as the Steinhart-Hart equation, it still provides good results over a narrower temperature range.
What is the linearity of a thermistor and parallel resistor?
Thermistor – parallel resistor combination Figure 3 shows the S shaped temperature-resistance curve produced by placing a 10K resistor in parallel with a thermistor whose resistance is 10K at 25°C. This makes the region of the curve between 0°C and 50°C fairly linear. Note that maximum linearity is around the midpoint, which is at 25°C.