News center

What should we consider when selecting the model of adjustable potentiometer? The following aspects should be considered clearly before we select the adjustable potentiometer. Voltage and current limit of adjustable potentiometer When the voltage applied to both ends of the adjustable potentiometer increases to a certain value, the phenomenon of breakdown will occur, so that the resistance value increases irreversibly or the open circuit, so the applied voltage must be limited. The breakdown of resistors generally occurs between two outgoing lines or between spiral grooves. The breakdown voltage between outgoing lines depends on the shape, distance and ambient atmospheric pressure of the outgoing lines. Therefore, the breakdown voltage between resistor grooves depends on the quality of the grooves, the width of the grooves and the withstand voltage of the insulating materials. The current value determined according to the nominal resistance value and rated power consumption is called rated current. From the above, it can be seen that when the rated power consumption is constant, the smaller the resistance value is, the greater the rated current is. For low resistance resistors, its contact resistance accounts for a large proportion. When the current passes through, the greater the power consumed here is. At the same time, from the contact part, because the high current density in this part will cause local overheating and lead to early aging. In addition, if there are high-voltage electric pulses in the circuit, the glass glaze film potentiometer should be selected. Three principles for selecting the model of adjustable potentiometer: 1. Select potentiometers produced by manufacturers with quality advantages, function advantages, function-price ratio advantages, efficiency advantages and service advantages. 2. Select the potentiometer manufacturer in the model catalog that can meet the above requirements, and order the potentiometer directly from it. 3. Select the high level standard potentiometer manufactured by the production line certified by the certification authority.