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Rotary Potentiometers, Rheostats

Rotary potentiometers and rheostats are one type of voltage- and current-measuring instrument, often called a “variable resistance”. The two terms are often used interchangeably and are often confused when it comes to their applications. However, the two devices do have differences, and the 380C32500 is an example of a rotary potentiometer.

380C32500 application field and working principle

The 380C32500 is a precision conductive plastic rotary potentiometer, designed for linear adjustment of electric circuits. It is available in single turn and multi-turn versions and is suitable for applications such as volume and brightness controls, mixers and potentiometric transducers. The 380C32500 features low contact resistance, low temperature coefficient and a wide adjustment range. It has a low-profile design with a slotted actuator and it is rated for an operating voltage of 1V to 48V and power dissipation of up to 200mW.

The core of the 380C32500 is a conductive plastic element. By rotating its axis, the user can control the amount of resistance by varying the area of contact between the element and the sliding contact. This change in resistance will be reflected in the output voltage or current. The contact is stabilized by a locking mechanism which ensures accurate and consistent resistances.

This rotary potentiometer is highly durable and reliable due to its rugged design. It operates with a wide temperature range of -25° C to +85° C and is ideal for use in harsh environments. It has a life expectancy of up to a million cycles and is designed to meet IEC standards.

Advantages and disadvantages of rotary potentiometers

The primary advantages of rotary potentiometers are their simplicity and reliability. The design of a rotary potentiometer is clear, with the moving contact connected to a potentiometer’s axis as two terminal plates, while the third terminal plate is the exit point. Only one moving contact is necessary for its operation. This makes them easy to use and they provide consistent results. Furthermore, these devices are relatively inexpensive compared to other types of voltage- and current-measuring instruments.

On the other hand, rotary potentiometers are not suitable for rapid or high-speed adjustments, as they require manual adjustment. In addition, their accuracy is not as high as other types of measuring instruments. These devices are also prone to mechanical wear, dirt and dust, which can reduce their performance over time.

Conclusion

The 380C32500 is an example of a rotary potentiometer, a type of voltage- and current-measuring instrument used for linear adjustment of electric circuits. It features a low-profile design with a slotted actuator, low contact resistance and a wide adjustment range. The primary advantages of rotary potentiometers are their simplicity and reliability, but their accuracy is not as high as other types of instruments and they are not suitable for rapid or high-speed adjustments.

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