How is temperature measured with NTC thermistors?

However, here the focus will be on using NTC thermistors to measure temperature in microcontroller based applications. The following NTC thermistor parameters can be found in the manufacturer’s data sheet. This is the thermistor resistance at the temperature specified by the manufacturer, often 25°C.

What happens when the thermistor is not working?

When a thermistor is failing, it’ll display incorrect temperatures, or you’ll see impossible temperature fluctuations. For example, you may initially get a reading of 210 degrees only to see the temperature drop to 189 degrees and jump back up again.

What can a thermistor be used for in a car?

Thermistors serve a variety of purposes and can be found in everything from refrigerators and hair dryers to vehicles. Typically, they’re used as temperature sensors but can be extremely useful when it comes to current protection. So, what happens when a thermistor starts displaying incorrect readings?

How can I measure the resistance of the thermistor?

Thermistor Response to Temperature. As with any resistor, you can use the ohmmeter setting on your multimeter to measure thermistor resistance. The resistance value displayed on your multimeter should correspond to the ambient temperature near the thermistor. The resistance will change in response to temperature change.

How to test your NTC thermistor-sensor sci?

Testing an NTC thermistor is slightly different from testing the PTC version. NTC thermistors have their resistance decreased when the temperature increases. The steps include: Prior doing anything, check the rated value of the device (100Ω, 1KΩ, 10KΩ).

How to test a thermistor-learning about electronics?

If the NTC thermistor follows this behavior, then it is good. If it does not, it is faulty and should be discarded. Testing a PTC thermistor follows all the same steps as a NTC thermistor. First check, with an ohmmeter, the thermistor without any heat applied.

How to test a PTC thermistor without heat?

How to Test a PTC Thermistor. Testing a PTC thermistor follows all the same steps as a NTC thermistor. First check, with an ohmmeter, the thermistor without any heat applied. With a PTC thermistor at room temperature or below, the thermistor should measure a very low resistance.

Can a thermistor be used in a colder area?

If you’re in a colder area, it will be at a higher value. This is the first preliminary test to check whether a thermistor is good. If it is near its rated resistance value, then so far, it is good. If it is very far or much different than its rated value, then the thermistor is faulty and should be discarded.