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parameter identification and function of potentiometer
potentiometer parameters
Nominal resistance
The nominal resistance usually refers to the resistance value marked on the potentiometer. The basic unit of resistance value is ohm, which is expressed by Ω. In practical applications, thousands of ohms (kΩ) and megohms (MΩ) are also commonly used.
rated power
The rated power of the potentiometer refers to the power that the potentiometer can load for a long time without changing its performance under standard atmospheric pressure and a certain ambient temperature. The power is indicated by p and the unit is watt (W).
Resistance change law
The law of resistance change refers to the relationship between the rotation angle (or stroke) of the potentiometer and its output voltage when used as a voltage divider. Common potentiometer resistance changes linearly, exponentially and logarithmically.
D linear potentiometer (denoted by A). The conductive material on the resistor body is evenly distributed. The resistance value per unit length is approximately equal. The change in resistance value is in a linear relationship with the rotation angle of the potentiometer, and is mostly used for voltage division.
0 logarithmic potentiometer (denoted by B), the conductive material on the resistor body is unevenly distributed, when the rotation starts, the resistance value changes less; when the rotation angle increases, the resistance value changes more; The change has an exponential relationship with the rotation angle of the potentiometer, which is mostly used for volume control.
Reverse logarithmic potentiometer (denoted by C), the conductive material on the resistor body is unevenly distributed, the resistance value changes greatly at the beginning of rotation; when the rotation angle increases, the resistance value change is small: resistance value The change of and the rotation angle of the potentiometer has a logarithmic relationship, which is mostly used for volume control.
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