How to Test a Thermistor


Thermistors are resistors that adjust to changes in temperature. They are used in circuits and semiconductor applications. If they malfunction, the circuit itself will likely malfunction, also. Since thermistors are designed to be temperature sensitive, testing them involves the application of heat.

Things You'll Need

  • Soldering iron
  • Multimeter or ohmmeter
  • Set the multimeter to resistance mode.

  • Hook up the terminals of the multimeter to leads on the thermistor. It does not matter which lead goes to the terminals, as polarity is not important in this test.

  • Heat the soldering iron. Heat the thermistor by moving your heated soldering iron tip to it.

  • Note the multimeter reading as you are applying this heat. A properly functioning positive temperature coefficient thermistor will show a smooth and steady increase in the multimeter resistance reading. A properly functioning negative temperature coefficient thermistor will show a smooth and steady decrease in the multimeter resistance reading.

  • Look for signs of a faulty thermistor. A steady reading that does not change, a reading of zero or a reading of infinity are all indications that the thermistor needs to be replaced.
    The change in reading will not be smooth or there will not be any change.

Related Searches


Promoted By Zergnet



You May Also Like

  • How to Test a Freezer Thermistor

    Refrigerator freezer compartments use an internal temperature sensor known as a thermistor to regulate the compressor and evaporator fan. If there's a...

  • How to Change a Thermistor on a Whirlpool Dryer

    Thermistors are heat sensors found in the dryer behind the back panel of your Whirlpool dryer. When your dryer isn’t drying properly,...

  • How to Test a Thermistor on a Mosquito Magnet

    The Mosquito Magnet company manufactures several electric mosquito traps. Placed correctly in your yard, the traps attract mosquitoes and other biting insects....

  • Types of Thermistors

    A thermistor is a type of resistor that is specially manufactured to decrease resistance whenever there is a rise in temperature. The...

Related Searches

Check It Out

Geek Vs Geek: Robot battles, hoverboard drag race, and more

Is DIY in your DNA? Become part of our maker community.
Submit Your Work!