How to use a Digital multimeter to measure the quality of the thermostat
How to judge whether the thermostat is good or bad: remove the suspected faulty thermostat from the box, rotate the thermostat adjustment lever to the normal position, and use the multimeter R×l to measure the temperature between the two main contacts of the thermostat. The resistance value, the normal resistance value should be zero or 1-2Ω. If the resistance value is infinite, it means that the temperature-sensing agent in the temperature-sensing element has leaked light; if the resistance value is above 10Ω, it means that there has been serious carbon deposition between the contacts. Put the thermostat with normal resistance into the freezer of small refrigeration equipment such as refrigerators and freezers in normal operation for about 10 minutes, and then use the multimeter R×L to quickly measure the resistance between the two main contacts of the thermostat , under normal circumstances should be infinite, if the resistance is zero, it means that the contacts are stuck. If the thermostat contacts are not stuck, hold the thermostat's temperature sensor with your hand, and then measure the resistance between the two main contacts. When the hand holds the temperature-sensing tube, the two contacts are rapidly conducting, and the indicated value of the multimeter changes from infinite resistance to zero resistance, then the various mechanisms of the thermostat work normally.
