Friends who purchase potentiometers, you have to understand the technical indicators of these potentiometers

Friends who need to purchase potentiometers must figure out the four hard indicators of the potentiometer: rated power, nominal resistance, allowable error level, and resistance change law. These indicators must be accurately positioned to correctly select the potentiometer.

1. Rated power. The maximum power allowed to be dissipated on the two fixed ends of the potentiometer is the rated power of the potentiometer. It should be noted that the rated power is not equal to the power of the center tap and the fixed end.

2. Nominal resistance. The series of the nominal resistance value marked on the product is similar to the series of resistance.

3. Allowable error level. The error range between the measured resistance and the nominal resistance can allow ±20%, ±10%, ±5%, ±2%, ±1% errors according to different accuracy levels. The precision of the precision potentiometer can reach ±0.1%.

4. The law of resistance change. Refers to the relationship between the resistance value and the rotation angle (or sliding stroke) of the sliding contact. This relationship can be in any functional form. Commonly used are linear, logarithmic and reverse logarithmic (exponential). In use, linear potentiometers are suitable for voltage dividers; inverted logarithmic (exponential) potentiometers are suitable for volume controllers in radios, tape recorders, record players, and televisions. If you cannot find similar products during maintenance, you can use linear instead of logarithmic instead. Logarithmic potentiometers are only suitable for tone control, etc.