Several methods of NTC measuring thermistor

　　NTC thermistor is one of the electronic components we often use, so what methods can we use to measure it. When testing, we can use the multimeter R×1 block, which can be operated in two steps:

　　1. Measure the nominal resistance value Rt: The method of measuring the NTC thermistor with a multimeter is the same as the method of measuring the general fixed resistance, that is, the practice of directly measuring the Rt by selecting the appropriate resistance value according to the nominal resistance value of the NTC thermistor value. However, because NTC thermistors are very sensitive to temperature, the following points should be paid attention to when testing:

　　A: Rt is measured by the manufacturer when the ambient temperature is 25°C, so when measuring Rt with a multimeter, it should also be performed when the ambient temperature is close to 25°C to ensure the reliability of the test.

　　B: The measurement power shall not exceed the specified value to avoid measurement errors caused by the thermal effect of the current. During the test, do not hold the thermistor body with your hands to avoid the influence of human body temperature on the test.

　　2. Estimate the temperature coefficient αt: first measure the resistance value Rt1 at room temperature t1, then use an electric soldering iron as a heat source, approach the thermistor Rt, measure the resistance value RT2, and use a thermometer to measure the current surface of the thermistor RT. The average temperature t2 is calculated again.

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