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Potentiometer use matters needing attention

Time：2023-07-25

1. The resistance of the wire wound potentiometer is mainly made of polycarbonate synthetic resin, and it should be avoided with ammonia, other amines, alkali aqueous solution, aromatic hydrocarbons, ketones, aliphatic hydrocarbons, and fortifiers (high pH value) Contact, otherwise it will affect its performance.

2. When soldering the wire wound potentiometer terminal, avoid using water-soluble flux, otherwise it will promote metal oxidation and material mildew; avoid using poor solder, poor solder may cause difficulty in tin, resulting in poor contact or poor open circuit.

3. The terminal of the welding wire wound potentiometer may damage the potentiometer when the welding temperature is too high or the welding time is too long. The pin terminal shall be welded at 235 ℃ ± 5 ℃, and the welding time shall not exceed 3 seconds. Welding distance potentiometer body should be greater than 1.5mm when welding solder should not flow through the circuit board. The welding of wire terminals shall be completed within 3 seconds at 350°C ± 10°C. The terminal should avoid heavy pressure, otherwise it is easy to cause poor contact.

4. When welding, the height of rosin (flux) entering the printing machine board should be properly adjusted to prevent the flux from invading the inside of the wire-wound potentiometer, otherwise the brush and the resistor body will have poor contact, resulting in internal combustion and noise.

5. The wire wound potentiometer is used in the voltage regulating structure. The wiring method should be "1" feet grounded. The current regulating structure should be avoided, because the contact resistance between the resistor and the contact piece is not conducive to the passage of large current.

6. Avoid condensation or water droplets on the surface of the wire-wound potentiometer, avoid using it in damp places, and prevent insulation deterioration or short circuit.

7. When installing the rotary potentiometer, its strength should not be too tight, so as not to cause damage to the helical teeth or poor rotation, etc. When installing the "iron shell straight slide" wire wound potentiometer, you should avoid using too long screws, otherwise it may hinder the movement of the slider, or even directly damage the potentiometer itself.

8. In the process of installing the knob of the wirewound potentiometer, the thrust used should not be too large (cannot exceed the parameter index of the shaft thrust in the specification), otherwise the potentiometer will be damaged.

9. The rotation force (rotation or sliding) of the wire wound potentiometer becomes lighter as the temperature increases, and tightens as the temperature decreases. 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.

10. The shaft or slider of the wire wound potentiometer should be as short as possible. The shorter the length of the shaft or sliding handle, the better and more stable the feel. On the contrary, the longer you shake, the better it feels.

11. The power of the carbon film of the wirewound potentiometer can withstand an ambient temperature of 70°C. When the operating temperature is higher than 70°C, the power may be lost.

Keywords： Potentiometer use matters needing attention