Detection of negative temperature coefficient thermistor

　　1. Measurement of nominal resistance Rt: The method of measuring NTC thermistor with multimeter is the same as that of measuring ordinary fixed resistance, that is, the actual value of Rt can be directly measured by selecting a suitable resistance block according to the nominal resistance of NTC thermistor. However, since NTC thermistor is very sensitive to temperature, the following points should be noted during the test: ARt is measured by the manufacturer when the ambient temperature is 25 ℃, so when using a multimeter to measure Rt, it should also be conducted when the ambient temperature is close to 25 ℃ to ensure the reliability of the test. B The measured power shall not exceed the specified value to avoid measurement error caused by current thermal effect. C Pay attention to correct operation. During the test, do not hold the thermistor by hand to prevent the human body temperature from affecting the test.

　　2. Estimated temperature coefficient α t: First, measure the resistance value Rt1 at room temperature t1, then use the electric soldering iron as the heat source, close to the thermistor Rt, and measure the resistance value RT2. At the same time, use a thermometer to measure the average temperature t2 of the thermistor RT surface at this time, and then calculate.

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