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The digital multimeter can measure light{{0}}emitting diodes, rectifier diodes... When measuring, the position of the test leads is the same as that of voltage measurement, turn the knob to " "; connect the red test lead to the positive electrode of the diode, and the black test lead to the negative electrode, and the forward direction of the diode will be displayed at this time. pressure drop. The voltage drop of Schottky diodes is about 0.2V, ordinary silicon rectifiers (1N4000, 1N5400 series, etc.) are about 0.7V, and light-emitting diodes are about 1.8-2.3V. Replace the test leads, the display shows "1.", it is normal, because the reverse resistance of the diode is very large, otherwise the tube has been broken down.
