2
Forward-Bias Diode Test
Connect the black test lead to the cathode, and connect the red test lead to the anode.
For a silicon diode, the reading should be approximately 0. V.
For an LED, the reading should be approximately . V to 2.0 V.
Reverse-Bias Diode Test
Connect the black test lead to the anode, and connect the red test lead to the cathode.
Normally, “OL” appears. If a voltage value appears, the diode is defective.
Black
Red
Figure 1 Forward-bias test
Test leads
Red
Black
Figure 2 Reverse-bias test
Test leads
