The multimeter detects the thermistor is good or bad
For the measurement of thermistor, its purpose is to measure its resistance and accuracy.
When testing, use the ohm gear of the multimeter, which is divided into two steps: first test at room temperature, use alligator clips instead of test pens to respectively clamp the two pins of the PTC thermistor to measure the actual resistance value and compare it with the nominal resistance value , the difference between the two is within ±2Ω is normal. If the actual resistance value is too different from the nominal resistance value, it means that the performance is poor or damaged.
Secondly, heating detection, on the basis of normal temperature test, the second step of testing can be carried out: heating detection, heat a heat source close to the thermistor, and observe the multi-function indicator. At this time, if the multi-function indicator If the resistance value changes with the increase of temperature, it means that the resistance value is gradually changing. When the resistance value changes to a certain value, the displayed data will gradually stabilize, indicating that the thermistor is normal. use.
