Simple method of measuring thermistor

When testing, use the multimeter R × 1 block, the detailed can be divided into two steps:

1) Measuring 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 according to the nominal resistance of the NTC thermistor. value. However, because the NTC thermistor is very sensitive to temperature, the following points should be noted during the test:

A: Rt is measured by the manufacturer at an ambient temperature of 25 ° C. Therefore, when measuring Rt with a multimeter, it should also be carried out at an ambient temperature of nearly 25 ° C to ensure the credibility of the test.

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

2) Estimate the temperature coefficient αt: first measure the resistance value Rt1 at room temperature t1, then use the electric iron as the heat source, close the thermistor Rt, measure the resistance value RT2, and use the thermometer to measure the appearance of the thermistor RT at the moment. The average temperature t2 is then calculated.

The methods shared in this article can be tried and hoped to help you solve the related problems.