When testing the characteristics of a thermistor, the most common method is to use a multimeter. The process typically involves several key steps that help determine whether the thermistor is functioning properly or not.
The first step is to perform a room temperature test. It's important that the ambient temperature is close to 25°C for accurate results. At this stage, you don’t need to use standard test leads; instead, you should connect alligator clips to the multimeter probes. Then, clamp the alligator clips onto both ends of the PTC thermistor.
Once connected, measure the resistance of the thermistor and compare it with the nominal value provided by the manufacturer. If the measured resistance is within ±2 ohms of the specified value, the thermistor is likely in good condition. However, if there is a significant deviation from the nominal resistance, it may indicate that the thermistor is damaged or has poor performance. In such cases, it should no longer be used and should be replaced.
The second step involves a heating test. Even if the thermistor passes the room temperature test, it’s still important to check its behavior under heat. To do this, place a heat source like a soldering iron near the thermistor. As the temperature increases, observe the multimeter reading. A properly functioning thermistor should show a gradual change in resistance as the temperature rises. Eventually, the resistance value should stabilize at a certain point.
If the resistance remains constant or shows no change during heating, it means the thermistor is faulty and cannot be used anymore. In such cases, it must be replaced with a new one. This two-step testing method ensures that the thermistor is not only working at room temperature but also responds correctly to changes in temperature, making it suitable for its intended application.
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