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What are the points for attention in rotary potentiometers?
Date：2018-11-02
Views：414
You may not know that the fans, lamps, audio and so on used in our home all need to use the rotary potentiometer, which is a resistor with potential or electromotive force changes and can be adjusted. The following is an introduction of its use precautions:
1. The resistors of linear rotary potentiometer are mostly made of polycarbonate synthetic resins. They should avoid contact with ammonia, other amines, alkali aqueous solutions, aromatic hydrocarbons, ketones, lipids, strong chemicals (high acid-base value), etc. Otherwise, their performance will be affected.
2. The terminal of rotary potentiometer should avoid using water-capacitive flux when welding, otherwise it will promote metal oxidation and material mildew; avoid using inferior flux, poor soldering may cause tin difficulty, lead to poor contact or circuit break.
3. The terminal of precision rotary potentiometer may be damaged if the welding temperature is too high or the welding time is too long. Welding of pin-type terminals should be completed in 235℃±5℃ within 3 seconds. Welding should be more than 1.5MM away from the rotary potentiometer body. No soldering tin should be used to flow through the circuit board during welding. Welding of wire-type terminals should be completed in 350℃±10℃ within 3 seconds. And the terminal should avoid heavy pressure, otherwise easy to cause bad contact.
4. When welding, the height of rosin (flux) entering the printing press plate should be adjusted properly. The flux should be avoided from intruding into the inner of the rotary potentiometer. Otherwise, it will cause bad contact between the brush and the resistor, resulting in INT and bad noise.
5. Linear rotary potentiometer is best used in voltage adjustment structure, and the connection mode should choose "1" foot grounding; current adjustment structure should be avoided, because the contact resistance between resistance and contact plate is not conducive to the passage of large current.
6. The surface of rotary potentiometer should avoid condensation or water droplets, avoid using in wet places to prevent insulation deterioration or short circuit.
7. When installing linear rotary potentiometer to fix nuts, the strength should not be too tight to avoid destroying the screw teeth or poor rotation; when installing "iron shell direct sliding" rotary potentiometer, avoid using too long screw, otherwise it may hinder the movement of sliding handle, or even directly damage the rotary potentiometer itself.
8. In the process of putting the knob on the precision rotary potentiometer sleeve, the thrust force used should not be too large (it can not exceed the parameters of the pulling force of the axis in the Specification), otherwise it may cause damage to the rotary potentiometer.
9. The rotary operating force (rotation or sliding) of the rotary potentiometer will become lighter with the increase of temperature and tighter with the decrease of temperature. If rotary potentiometers are used in low temperature environment, it is necessary to explain, in order to use special low temperature resistant grease.
10. the shaft or sliding handle of the precision rotary potentiometer should be designed as short as possible. The shorter the length of the shaft or sliding handle, the better and stable hand feel. Conversely, the longer the shaking is, the easier the handle will change.
11. The power of the carbon film of the rotary potentiometer can withstand the ambient temperature of 70℃, and it may lose its function when the temperature is higher than 70℃.
1. The resistors of linear rotary potentiometer are mostly made of polycarbonate synthetic resins. They should avoid contact with ammonia, other amines, alkali aqueous solutions, aromatic hydrocarbons, ketones, lipids, strong chemicals (high acid-base value), etc. Otherwise, their performance will be affected.
2. The terminal of rotary potentiometer should avoid using water-capacitive flux when welding, otherwise it will promote metal oxidation and material mildew; avoid using inferior flux, poor soldering may cause tin difficulty, lead to poor contact or circuit break.
3. The terminal of precision rotary potentiometer may be damaged if the welding temperature is too high or the welding time is too long. Welding of pin-type terminals should be completed in 235℃±5℃ within 3 seconds. Welding should be more than 1.5MM away from the rotary potentiometer body. No soldering tin should be used to flow through the circuit board during welding. Welding of wire-type terminals should be completed in 350℃±10℃ within 3 seconds. And the terminal should avoid heavy pressure, otherwise easy to cause bad contact.
4. When welding, the height of rosin (flux) entering the printing press plate should be adjusted properly. The flux should be avoided from intruding into the inner of the rotary potentiometer. Otherwise, it will cause bad contact between the brush and the resistor, resulting in INT and bad noise.
5. Linear rotary potentiometer is best used in voltage adjustment structure, and the connection mode should choose "1" foot grounding; current adjustment structure should be avoided, because the contact resistance between resistance and contact plate is not conducive to the passage of large current.
6. The surface of rotary potentiometer should avoid condensation or water droplets, avoid using in wet places to prevent insulation deterioration or short circuit.
7. When installing linear rotary potentiometer to fix nuts, the strength should not be too tight to avoid destroying the screw teeth or poor rotation; when installing "iron shell direct sliding" rotary potentiometer, avoid using too long screw, otherwise it may hinder the movement of sliding handle, or even directly damage the rotary potentiometer itself.
8. In the process of putting the knob on the precision rotary potentiometer sleeve, the thrust force used should not be too large (it can not exceed the parameters of the pulling force of the axis in the Specification), otherwise it may cause damage to the rotary potentiometer.
9. The rotary operating force (rotation or sliding) of the rotary potentiometer will become lighter with the increase of temperature and tighter with the decrease of temperature. If rotary potentiometers are used in low temperature environment, it is necessary to explain, in order to use special low temperature resistant grease.
10. the shaft or sliding handle of the precision rotary potentiometer should be designed as short as possible. The shorter the length of the shaft or sliding handle, the better and stable hand feel. Conversely, the longer the shaking is, the easier the handle will change.
11. The power of the carbon film of the rotary potentiometer can withstand the ambient temperature of 70℃, and it may lose its function when the temperature is higher than 70℃.