Pointer multimeter measuring potentiometer
(1) Adjust the corresponding gear.
(2) Measure whether the pins on both sides of the potentiometer are consistent with the scalar. (0, infinity, and inconsistent with a scalar all indicate corruption)
(3) Measure the middle foot and the side feet with a multimeter, rotate the shaft to see if the resistance value changes smoothly, whether the maximum value is consistent with the scalar, and whether the minimum value is 0.
(4) For potentiometers with switches, check whether "on-off" is normal.
