Knob type adjustable potentiometer, which is a type of adjustable potentiometer with a rotating adjustment method. In addition to this adjustment method, our company also has direct sliding adjustable potentiometers and push-pull adjustable potentiometers. Today, the editor will mainly talk about the precautions for using knob type adjustable potentiometers, mainly to make the process of using knob potentiometers simpler, easier, more accurate, and safer. The precautions for welding adjustable potentiometers are also important when using them.
1. To avoid deformation or burning of the contacts and conductive layer of the rotary adjustable potentiometer, the working current of the rotary adjustable potentiometer with small resistance values shall not exceed the allowable large current of the contacts.
2. Use a multimeter to check the nominal resistance value, which should meet the requirements. If a multimeter is used to measure the resistance value between the fixed end and the sliding end terminal of the potentiometer, the meter needle should rotate smoothly without any jumping phenomenon when adjusting the handle shaft of the slow knob type potentiometer. Before use, the quality of the rotary adjustable potentiometer should be checked. Check whether the shaft handle of the knob type adjustable potentiometer rotates sensitively, whether the tightness is appropriate, and whether there is any mechanical noise.
3. Knob type adjustable potentiometers should be firmly installed, and the nuts that should be tightened should be tightened with sufficient torque to prevent loosening and displacement during long-term use, as well as collision with other components and circuit abnormalities.
4. Knob type adjustable potentiometers should not be used in environments with high concentrations of chemicals such as ammonia, ketones, halogenated hydrocarbon amines, alkaline solutions, and aromatic hydrocarbons, as the component knob type adjustable potentiometers are made of synthetic resins such as polycarbonate, which can extend the service life of the knob type adjustable potentiometers.
5. When the knob type adjustable potentiometer is severely damaged, it is necessary to replace it with a new one. At this time, it is better to choose a knob type adjustable potentiometer with the same model and resistance as the original potentiometer. It is also important to note that the shaft length and end shape of the knob type adjustable potentiometer should match the original knob.
6. To ensure convenient adjustment of knob type adjustable potentiometers without being affected by adjacent components, knob type adjustable potentiometers can be directly installed on printed circuit boards, but attention should be paid to the arrangement of adjacent components.
7. Knob type adjustable potentiometers should be used within the rated value and should not be used under overload. When using a rotary adjustable potentiometer as a variable resistor to regulate current, in order to ensure that the current flowing through does not exceed the rated value allowed by the potentiometer, it is necessary to avoid the failure of the rotary adjustable potentiometer due to partial overload. The allowable power consumption should be reduced in proportion to the stroke of the brush in contact with the moving contact. To avoid the current exceeding the allowed maximum value when the potentiometer resistance is adjusted close to zero, it is advisable to connect a current limiting resistor in series to prevent damage to the knob type adjustable potentiometer due to overcurrent.
8. Knob type adjustable potentiometers with grounding pads must be grounded to prevent external interference.
9. The maximum allowable working voltage of a rotary adjustable potentiometer cannot exceed the voltage generated when current flows through a high resistance rotary adjustable potentiometer.
The editor has explained in detail the precautions for using knob type adjustable potentiometers. It can be seen that this is similar to knob type potentiometers with switches, and I hope it can be helpful to everyone.
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