How to judge the quality of a dual-ganged potentiometer? This requires us to inspect its performance, and today we will detail the steps for testing a dual-ganged potentiometer.

Using the appropriate range of an ohmmeter, measure the resistance values of the two potentiometers on the dual potentiometer (i.e., the resistance between A and C, and the resistance between A' and C') to ensure they are the same and match the rated resistance values.

2. Connect wires to short-circuit potentiometers A and C', as well as potentiometers A' and C, then measure the resistance value between the center terminals B and B'.

Under ideal conditions, regardless of the position of the potentiometer's shaft, the resistance between points B and B' should always be equal to the resistance between points A and C or A' and C' (i.e., the multimeter needle should remain stationary on the A, C, or A', C' resistance scales). If the multimeter needle deflects, it indicates that the potentiometer's synchronization performance is poor.