The main parameters and identification of the potentiometer
The main parameters of the potentiometer
(1) Nominal resistance value on the product is the same as the nominal resistance series of resistors. According to different precision grades, the allowable deviations between the actual value and the nominal value are 20%, 10%, 5%, 2% and 1%, and the precision of the precision potentiometer can reach 0.1%.
(2) the rated power of the rated power potentiometer is the maximum dissipation power allowed between the two fixed ends.
Note: the allowable power between the sliding end and the fixed end is less than the rated power.
(3) Sliding noise
When the brush slides on the resistor body, there is an irregular fluctuation between the voltage between the center end of the potentiometer and the fixed end. This phenomenon is called sliding noise. It is caused by the uneven distribution of material resistivity and the random change of contact resistance when the brush is slipping.
The most precise adjustment ability of potentiometer to output is called resolution. The resolution of a wire wound potentiometer is poor.
(5) The law of the change of the resistance. When adjusting the sliding end of the potentiometer, its resistance will change according to certain rules. The resistance of common potentiometers varies linearly, exponentially and logarithmically.
(6)Starting torque and moment of rotation.
Starting torque refers to the minimum torque required when the rotating axis of a potentiometer starts in a rotating range; the moment of rotation refers to the torque needed when the rotating axis of a potentiometer rotates at a constant speed. The smaller the difference, the better. The potentiometer used in the automatic control device with the servo motor requires small starting torque and flexible rotation, and the starting torque and torque of the potentiometer used for circuit adjustment should not be too small.
The identification of the potentiometer
The main method of identifying the parameters of the potentiometers is the direct standard method. The nominal value, the allowable deviation, the rated power and the type are usually labeled on the shell of the potentiometer, and some small potentiometers only mark the nominal value.
For example: a potentiometer shell is marked W51K--0.5/X, indicating nominal resistance 51kilo-ohm, rated power 0.5W, X potentiometer.
If you want to know more, our website has product specifications for parameters, you can go to allicdata electronics limited to get more information