Adjustable resistor is an electronic component that is very common in instrumentation, security equipment, and home appliance control boards. The use of adjustable resistor is mainly considered from the perspective of voltage divider. The resistance value R on both sides of the resistor can be relatively accurate and stable. , The power ratio of the adjustable resistor is small, and the absolute accuracy can be ignored, mainly from the current controller. The following items should be paid attention to in the use of adjustable resistors:

1. The power of the adjustable resistor can withstand the ambient temperature of 70°C, and its function may be lost when the operating temperature is higher than 70°C.

2. The surface of the adjustable resistor should avoid condensation or the presence of water droplets, and avoid using it in humid places.

3. The rotary operating force of the adjustable resistor will become lighter with the increase of temperature, and become tighter with the decrease of temperature. If the potentiometer is used in a low temperature environment, it needs to be explained, so that special low temperature resistant grease can be used.

4. When installing the rotary adjustable resistor, the strength should not be too tight when fixing the nut to avoid damage to the thread or improper rotation.

5. Don't use too long screws when installing the adjustable resistance of the iron casing, otherwise it may hinder the movement of the sliding handle and even directly damage the potentiometer itself.

6. Adjustable resistors are best used in voltage adjustment structures, and current adjustment structures should be avoided, because the contact resistance between the resistor and the contact piece is not conducive to the passage of large currents.

7. If the welding temperature of the adjustable resistor is too high or the time is too long during welding, it may cause damage to the potentiometer.

8. The terminal of the plug-in adjustable resistance should be soldered at 235℃±5℃ within 3 seconds. The soldering should be more than 1.5mm away from the potentiometer body. Do not use solder to flow through the circuit board during soldering.

9. The resistor body of the adjustable resistor is mostly made of polycarbonate synthetic resin. Avoid contact with other amines such as ammonia, otherwise it will affect its performance.

10. The shaft or sliding handle of adjustable resistance should be as short as possible when designing. The shorter the shaft or sliding handle, the better and stable the hand feel. On the contrary, the longer the shaking, the greater the shaking, and the feel is easy to change.

11. When soldering the terminals of the SMD adjustable resistance, avoid using water-capacitive flux, otherwise it will promote the oxidation of the metal and the mold of the material.

12. Avoid using inferior flux during use. Poor soldering may cause difficulty in soldering, resulting in poor contact or open circuit.