How to use a multimeter to detect the quality of the rectifier diode
Using the "diode" gear of the digital multimeter can accurately measure the quality of the rectifier diode. As we all know, the diode is a semiconductor "PN junction". The PN junction of silicon material and germanium material has the function of single-phase conduction, but the forward voltage drop is slightly different, about 0.6-0.7V and 0.2-0.3V respectively. . The "diode" position of the digital multimeter is designed to measure the voltage drop of this PN junction.
1. Turn the knob on the multimeter to the diode gear (which is also the gear for measuring on-off), and insert the red and black test leads into the correct position of the multimeter.
2. Connect the red test lead and the black test lead to the positive and negative electrodes of the diode respectively. A good diode will display 0.5XX (silicon tube) or 0.2XX (germanium tube); the two test leads are reversely connected, and "OL" (or "1") is displayed. . A damaged diode measurement will be very different from these two values and will be easy to tell apart.
