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The dial potentiometer is a potentiometer commonly used for the tuning function. There are three pin dial potentiometers and five pin dial potentiometers. They are often used in the audio system. So sometimes the audio system is bad. Is the dial potentiometer bad The following methods teach you to judge! 1、 It is recommended that you open the four feet on the black base of the potentiometer and wipe the resistance coil with alcohol to see the effect; 2、 You are now on the 200th gear, and 09.7 is abnormal in terms of data; 3、 You connect the meter rod to the foot on the two sides and measure whether the total resistance value is within ± 5% of 100 Ω, and 95 Ω - 105 Ω is normal; 4、 As for the minimum display of 0.5 Ω, it is normal from our manufacturer's data. Because of the influence of the zero resistance potentiometer, as well as the copper wire and aluminum wire resistance in the connection of the meter bar, it is referred to as the meter resistance.