Principles of using rotary potentiometer2021

Rotary potentiometer is a kind of rotary adjustable potentiometer. When using rotary potentiometer, we should follow the standard of potentiometer use, so as to use the rotary potentiometer more reasonably, so as to prevent the poor performance of the rotary potentiometer and extend the rotary potentiometer. Service life.

1. In order to prevent the contact and conductive layer of the rotary potentiometer from degenerating or burning, the working current of the rotary potentiometer with a small resistance value must not exceed the maximum current allowed by the contact.

2. Check the nominal resistance value with a multimeter, and it should meet the requirements. If you use a multimeter to measure the resistance between the fixed end and the sliding end of the potentiometer, when the handle of the knob-type adjustable potentiometer is turned slowly, the needle should rotate smoothly without leaping. The quality of the rotary potentiometer should be checked before use. Whether the shaft handle of the rotary potentiometer is sensitive to rotation, whether the tightness is appropriate, and whether there is mechanical noise.

3. The rotating potentiometer should be strong and reliable when it is installed, and the nut should be tightened with sufficient torque to avoid looseness and displacement during long-term use, and abnormalities in the circuit when it collides with other components.

4. Do not use the rotary potentiometer in an environment with high concentrations of chemicals such as ammonia, ketones, halogenated hydrocarbon amines, alkali solutions and aromatic hydrocarbons, because the knob-type adjustable potentiometer is made of polycarbonate. It is made of synthetic resin, which can extend the service life of the rotary potentiometer.

5. When the rotary potentiometer is severely damaged, a new rotary potentiometer needs to be replaced. At this time, it is best to choose a rotary potentiometer with the same model and resistance as the original potentiometer, and pay attention to the shaft length and the shape of the shaft end of the rotary potentiometer. Match the original knob.

6. In order to ensure convenient adjustment of the rotary potentiometer without being affected by adjacent components, the rotary potentiometer can be installed directly on the printed circuit board, but attention should be paid to the arrangement of adjacent components.

7. The rotary potentiometer should be used within the rated value and cannot be used with overload. When the rotary potentiometer is used as a rheostat to adjust the current, in order to ensure that the current flowing does not exceed the allowable rated value of the potentiometer, the rotary potentiometer should be prevented from failing due to partial overload, and the allowable power consumption should be in contact with the movable contact of the brush stroke A relatively proportional reduction. In order to avoid the current when the resistance of the potentiometer is adjusted close to zero, it is better to connect a current-limiting resistor in series to prevent damage to the rotary potentiometer due to overcurrent.

8. Rotary potentiometer with grounding pads, in order to prevent external interference, the secondary pads must be grounded.

9. The maximum working voltage allowed by the rotary potentiometer cannot exceed the voltage generated when the current flows through the high-resistance rotary potentiometer.