What is the cause of potentiometer noise

The potentiometer is actually a variable resistor, because its function in the circuit is to obtain an output voltage that has a certain relationship with the input voltage (external voltage), so it is called a potentiometer.

Dynamic noise of the potentiometer When the dynamic contact point of the potentiometer slides on the resistor body under the action of an external voltage, the electrical noise generated is called the dynamic noise of the potentiometer. Dynamic noise is one of the main parameters of sliding noise. The value of dynamic noise and the speed of the shaft, the contact resistance between the contact point and the resistor, the uneven change of the resistivity of the resistor, the number of moving contact points and the magnitude of the applied voltage related.

Sliding noise is a noise peculiar to potentiometers. When changing the resistance value, due to improper distribution of potentiometer resistance, improper coordination of the rotating system, and contact resistance of the potentiometer, when the movable contact moves on the surface of the resistor, in addition to useful signals at the output terminal, there are also accompanying signals. Noise with fluctuating signals. For wire-wound potentiometers, in addition to the above-mentioned moving contact and winding purpose contact noise, there are resolution noise and short-circuit noise. The resolution noise is caused by the stepped nature of the resistance change, while the short-circuit noise is generated when the moving contact moves on the winding and shorts adjacent turns. It is related to the current flowing through the winding and the turns. The resistance and the contact resistance between the moving contact and the winding are proportional.