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What is the thermistor
Visit: Date:2013-11-29
The thermistor, also is one kind of the temperature sensitive resistor. This resistor when the temperature changes its resistance also changes accordingly.
  Currently on the market a thermistor type many, if in accordance with the structure and the shape of it can be roughly divided into spherical, rod, tube, disc, circle shape etc.. Then we follow the different ways of heating is generally can be divided into direct heated type thermistor and indirectly heated thermistor. At the same time according to the working temperature range can be divided into normal temperature, high temperature, super low temperature thermistor. According to the temperature coefficient can be divided into the positive temperature coefficient thermistor and a negative temperature coefficient thermistor.
  At present, the most widely used is the negative temperature coefficient thermistor, also can be divided into the temperature measurement, pressure type, general type.
  Generally speaking, thermistor nominal value refers to the environment temperature is 25 ℃ resistance value. Using a multimeter measuring the resistance value of resistance, it does not necessarily and nominal resistance. We have the following simple with positive temperature coefficient thermistor for example, simple about its characteristics, positive temperature coefficient thermistor is also called the PTC thermistor, this kind of resistor temperature resistance will also increase, at the same time varying resistance and the change of temperature is proportional to the relationship, but the resistor temperature exceeds a set value, its resistance will be drastically increased, a increased to maximum, then the resistance value will slowly with the increase of temperature and begins to descend.

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