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Thermistors are divided into negative temperature coefficient (NTC) thermistors and positive temperature coefficient (PTC) thermistors.

The first step is to measure the resistance value at room temperature. Place the multimeter in a suitable ohm block (determine the gear according to the nominal resistance value), use two test leads to contact the two pins of the thermistor to measure the actual resistance value, and compare it with the nominal resistance value. If the difference is too large, it means that the measured thermistor has poor performance or has been damaged.

The second step is to measure the resistance value when the temperature changes (heating or cooling). On the basis of normal temperature test, the temperature rise or fall can be detected. Pinch the thermistor to measure the resistance value and observe the universal indicator. At this time, you will see that the displayed data changes with the increase in temperature (NTC means decrease, PTC means increase), indicating that the resistance value is gradually changing . When the resistance value changes to a certain value, the displayed data will gradually stabilize. If the ambient temperature is close to body temperature during measurement, you can use an electric soldering iron to approach or close to the thermistor for heating.