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How to judge the quality of the double potentiometer? This requires us to test its performance. Today, we will explain in detail the steps to test the dual potentiometer. 1. Measure the resistance values of the two groups of potentiometers on the dual-connected potentiometers (i.e., the resistance values between A and C and the resistance values between A 'and C') with the appropriate range of the resistance range of the multimeter, and check whether they are the same and consistent with the nominal resistance values. 2. Short-circuit potentiometers A, C 'and potentiometers A' and C with wires, and then use a multimeter to measure the resistance between center heads B and B ', Under ideal conditions, the resistance value between B and B 'should be equal to the resistance value between A, C or A' and C 'regardless of the position of the potentiometer shaft (that is, the pointer of the multimeter should always remain on the scale of A, C or A' and C 'resistance value). If the pointer of the multimeter is deflected, it indicates that the synchronization performance of the potentiometer is poor.