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The potentiometer is actually a variable resistor. Because its function in the circuit is to obtain the output voltage that has a certain relationship with the input voltage (applied voltage), it is called a potentiometer. Dynamic noise of potentiometer When the potentiometer is under the action of applied voltage and its moving contact point slides on the resistance body, 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 is related to the shaft speed, the contact resistance between the contact point and the resistor body, the uneven change of the resistance of the resistor body, the number of dynamic contact points and the applied voltage. Sliding noise is the noise peculiar to potentiometer. When changing the resistance value, due to the improper distribution of the potentiometer resistance, the improper coordination of the rotating system and the contact resistance of the potentiometer, when the moving contact moves on the surface of the resistor, the output end will not only have useful signals, but also accompanied by noise that fluctuates with the signal. For wire wound potentiometers, in addition to the contact noise for the purpose of moving contact and winding, there are also resolution noise and short circuit noise. The resolution noise is caused by the ladder of resistance change, while the short-circuit noise is generated when the moving contact moves on the winding and shortens the adjacent wire turns. It is proportional to the current flowing through the winding, the resistance of the wire turns, and the contact resistance between the moving contact and the winding.