Wiring, testing and use specification of adjustable potentiometer

Adjustable potentiometer wiring

The adjustable potentiometer is composed of 3 terminal pins. Generally, the left and right pins are the main body of the potentiometer, that is, the two end points of the overall resistance, and the middle pin is the output terminal. Wiring method: One of the pins on both sides of the potentiometer is grounded, which is 0 potential, the other pin is connected to the highest potential for adjustment, and the remaining center pin (output end) is connected to the power input terminal or the signal input terminal that needs to be adjusted.

How to detect the fault of adjustable potentiometer

1. Before testing the adjustable potentiometer, the zero electricity barrier must be performed. When measuring the resistance, the zero must be adjusted again every time the rate is blocked. Another thing is to listen to the friction sound between the internal contact point of the potentiometer and the resistor body. If there is a rustle, it means that the quality of the potentiometer is not good.

2. When testing with a multimeter, first select the appropriate electrical blocking position of the multimeter according to the resistance value of the adjustable potentiometer to be tested. At this time, use the electrical blocking of the multimeter to measure the two ends of the potentiometer pin 1 and 2 to change the potential Rotate the shaft 2 counterclockwise to close to the off position. At this time, the resistance value displayed is as small as possible. Then slowly rotate the shaft handle clockwise. When the shaft handle is rotated to the extreme position 3, the resistance value should be close to the nominal value of the potentiometer. If the pointer of the multimeter bounces during the rotation of the potentiometer's shaft, it indicates that the movable contact of the adjustable potentiometer has a fault with poor contact.

3. Finally, the remaining 1, 3 ends of the electric barrier of the multimeter are used to measure the potentiometer, and the measured reading is the nominal resistance of the potentiometer. For example, the pointer does not move or the resistance value of the multimeter is very different during measurement, which indicates that the potentiometer has been damaged.

Precautions for using adjustable potentiometer

1. During the use of the adjustable potentiometer, when the direct current is allowed to pass through the movable contact of the potentiometer, the problem of anodic oxidation may occur. In this case, it is best to connect the component with the negative end and connect the moving contact with the positive end.

2. When the control moving contact current is less than the moving contact limit current, in order to ensure the safety of the circuit, the load current of the adjustable potentiometer cannot be increased at will.

3. When using the adjustable potentiometer, do not load more than the rated power. For example, when the power dissipation exceeds the rated value, it will cause the potentiometer to overheat and damage it.

When inspecting the adjustable potentiometer, we also need to pay attention to the welding of the resistance circuit board. At least one pin should be welded first to avoid the influence of other components in the circuit on the test results. Also, do not use your hands during operation. Touch the conductive part of the test tip and resistor