Trimming Potentiometers are used to measure or divide voltages and to protect or control circuits. Semec make good offer for Trimming Potentiometers.
|number of turns||single turn||single turn||multi turn 28±2||multi turn 22±2||multi turn 12±2|
|Feature||9mm Square||6mm Square||9mm Square||19mm Rectangular||6mm Square|
|Resistance range||10Ω - 2MΩ||10Ω - 2MΩ||10Ω - 2MΩ||10Ω - 2MΩ||10Ω - 2MΩ|
|Rated power||0.5W@70℃, 0W@125℃||0.5W@70℃, 0W@125℃||0.5W@70℃, 0W@125℃||0.75W@70℃, 0W@125℃||0.5W@70℃, 0W@150℃|
|Temperature Coefficient||±250ppm／℃, ±100ppm／℃||±250ppm／℃, ±100ppm／℃||±250ppm／℃, ±100ppm／℃||±250ppm／℃, ±100ppm／℃||±250ppm／℃, ±100ppm／℃|
|Electrical Endurance||200cycles||200 cycles||200 cycles||200cycles||200 cycles|
|mounting type||Through hole||Through hole||Through hole||Through hole||Through hole|
Trimming Potentiometers are three-terminal resistors that are used to measure or divide voltages, and to protect or control circuits. Potentiometers are variable resistors that are adjusted with a knob or dial. Rheostats and trimmers are types of potentiometers. With a rheostat, a third “wiper” terminal is shorted to one of two fixed terminals. The wiper terminal has a resistance which varies with its position, and the two fixed terminals are connected by a fixed resistance. Trimmers are factory-set devices that require infrequent adjustments. They feature a slotted, actuator-type style and can be adjusted with a special tool or screwdriver. Other types of Trimming Potentiometers are also available. These include standard potentiometers, mechanical devices in which the output resistance is set by a shaft; and digital potentiometers, which set an output resistance by sending a digital signal through an electrical interface.
Trimming Potentiometers carry specifications for potentiometer category and actuator configuration. Industrial-grade potentiometers are protected by an enclosure, typically one that is rated by the National Electrical Manufacturers Association (NEMA). Typically, industrial-grade products are gear-driven and have connector outputs. These Trimming Potentiometers resist the ingress of dirt and dust, and last longer than unenclosed potentiometers. Discrete-board components, another potentiometer category, are also commonly available. In terms of actuator configuration, choices include single-turn, multi-turn, and slide. With single-turn devices, the shaft rotation is limited to less than or equal to 360 degrees. By contrast, multi-turn Trimming Potentiometers can be rotated multiple times, with as many as 15 or 20 turns from stop to stop. Slide-actuated products require the user to move a handle instead of rotating a knob.
Trimming Potentiometers differ in terms of construction, mounting or packaging, performance specifications and features. Choices for construction include ceramic composition, carbon composition, carbon film, cermet, thick film, thin film, metal alloy, metal film, and metal oxide. Wirewound resistors are also available. There are many mounting and packaging styles for Trimming Potentiometers. Choices include surface mount technology (SMT), bolt-on or chassis, panel mount, through-hole technology (THT), axial leads, gull-wing leads, J-leads, radial leads, screw terminals and tab terminals. The most important performance specifications to consider when selecting Trimming Potentiometers include resistance range, tolerance, operating alternating current (AC) voltage, operating direct current (DC) voltage, and operating temperature.