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source:Industry News release time:2022-05-07 Hits: Popular:Infrared sensing module
Thermistor is a type of sensitive element, which is divided into positive temperature coefficient thermistor (PTC) and negative temperature coefficient thermistor (NTC) according to different temperature coefficients. A typical characteristic of thermistors is that they are sensitive to temperature and exhibit different resistance values at different temperatures. The positive temperature coefficient thermistor (PTC) has a larger resistance value when the temperature is higher, and the negative temperature coefficient thermistor (NTC) has a lower resistance value when the temperature is higher. They are both semiconductor devices.
First test the resistance value in the indoor environment, and then hold the product with your hand to test to see if the resistance value becomes smaller, if the change is normal, otherwise it is abnormal.
Note: A special instrument should be used for accurate measurement during the test.
To detect the quality of the thermistor, you can use the heating method. Use the two test pens of the multimeter to connect the two leads of the thermistor, and then use a hot electric soldering iron (20W) to heat the thermistor (close to the thermal resistance). resistance). For PTC type thermistors, as the temperature increases, the resistance value should increase; for NTC type thermistors, as the temperature increases, the resistance value should decrease. If the thermistor is heated and its resistance does not change, the thermistor is damaged.
The resistance body and the heating body are insulated, but they are very close. Both are sealed together in a high-vacuum glass case. In temperature sensors, it is more convenient to use direct thermal thermistors, which are widely used.
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