D.E.V.I.C.E. is an encyclopedia of terms used by manufacturers of test and measurement equipment. T&M Atlantic created this service to better explain the functionality of instruments it offers, and to highlight the latest developments in the world of measurement equipment. We are using such tools as animation to bring words and pictures to life and to create not just an understanding but also an appreciation for technology that goes into the design of every instrument.
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Thermistor (thermoresistor) is a semiconductor resistor, which electrical resistance considerably depends on temperature. It is used for registration, temperature measurement in thermal control systems, in power meters and other devices.
There are two thermoresistor types: PTC (positive temperature coefficient) and NTC (negative temperature coefficient). The resistance of PTC thermistor, when the temperature is rising, increases, but in case of NTC thermistor – decreases.
Thermistors have high resolution and accuracy of ± 0,001°C with a good calibration. They are highly sensitive, have a simple two-wire connection circuit (which doesn’t require temperature compensation of free ends comparing to a thermocouple), a relatively high speed. But at the same time they have some disadvantages: a sharply nonlinear transformation characteristic and poor characteristic repeatability. In addition, they have a relatively narrow temperature range under measurement.