How to measure potentiometer

Method of measuring the potentiometer:

1, the detection of nominal resistance

When measuring, select the appropriate range of the multimeter resistance file, and connect the two test leads to the two fixed pin soldering pieces of the potentiometer. Firstly, measure whether the total resistance of the potentiometer is the same as the nominal resistance. If the measured resistance is infinite or larger than the nominal resistance, the potentiometer is open or damaged. Then connect the two hairs to either the center of the potentiometer and either of the two fixed ends. Slowly turn the potentiometer handle to rotate from one extreme position to the other. Normal potentiometer, multimeter indication The resistance value should be continuously changed from the nominal resistance (or 0Ω) to 0Ω (or nominal resistance). During the entire rotation process, the hands should change smoothly without any beating. If the needle has a beating phenomenon during the adjustment of the resistance value, it indicates that the potentiometer has a fault of poor contact.

 The detection method of the straight slide potentiometer is the same.

2. Detection with switch potentiometer

For the potentiometer with switch, in addition to the above method to detect the nominal resistance and contact of the potentiometer, it should also check whether the switch is normal. First rotate the potentiometer shaft handle to check if the switch is flexible. If there is a clear “click” sound when it is turned on or off. Use the multimeter R × 1 Ω file, the two test pens on the two external soldering pads of the potentiometer switch, rotate the potentiometer shaft handle, make the switch connected, the resistance value indicated on the multimeter should be changed from infinity (∞) to 0Ω. Turn the switch off again and the multimeter pointer should return to “∞” from 0Ω. During the measurement, the potentiometer switch should be turned on and off repeatedly to observe the reaction of the switch every time. If the resistance of the switch is not 0Ω at the "on" position and the resistance is not infinite at the "off" position, the switch of the potentiometer is damaged.

This article is from ALLICDATA ELECTRONICS LIMITED.