The sealed potentiometer we know is basically a sliding rheostat. There are several styles, which are generally used in the speaker volume switch and laser head power size adjustment. The outer casing of the sealed potentiometer is a housing that encloses and protects the main components of the potentiometer, which protects the internal components from dust and moisture.
The sealed potentiometer we know is basically a sliding rheostat. There are several styles, which are generally used in the speaker volume switch and laser head power size adjustment. The outer casing of the sealed potentiometer is a housing that encloses and protects the main components of the potentiometer, which protects the internal components from dust and moisture. So, how do you generally detect sealed potentiometers? Let's take a look at it.
During the entire rotation process, the hands should change smoothly without any beating. If the needle has a beating phenomenon during the adjustment of the resistance value, it indicates that the potentiometer has a fault of poor contact. The detection method of the straight slide potentiometer is the same.
Then connect the two hairs to either the center of the potentiometer and either of the two fixed ends. Slowly turn the potentiometer handle to rotate from one extreme position to the other. Normal potentiometer, multimeter indication The resistance value should be from the nominal resistance.
When measuring, select the appropriate range of the multimeter resistance file, and connect the two test leads to the two fixed pin soldering pieces of the potentiometer. Firstly, measure whether the total resistance of the potentiometer is the same as the nominal resistance. If the measured resistance is infinite or larger than the nominal resistance, the potentiometer is open or damaged.
In what case should I choose a sealed potentiometer? In the case of high frequency and high stability, a sealed potentiometer is used. For general applications, use a carbon film potentiometer. For the case where the voltage is required to be uniform, a linear potentiometer is selected. The volume control should use an exponential potentiometer. For high precision applications, use a wire wound multi-turn potentiometer. For high resolution applications, use a variety of non-wire wound potentiometers, multi-turn trimmer potentiometers. Different potentiometers are chosen for different occasions, so be sure to choose carefully during the selection process.
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