Just like any other electronic component, one of the methods used to identify whether a diode is defective is with the use of your senses. Some indications of a damaged diode are: crack on its body, a sign of burn or burnt smell coming from diode. If there are no physical signs that a diode is defective, you may use an ohmmeter to test its condition. Below are steps to be followed in testing diodes with an ohmmeter.
- Remove the diode from the circuit. Make sure to turn off the circuit and unplug it from the power source.
- Select the appropriate range, use Rx1 or Rx10.
- Connect the test probes to the terminals of the diode in such a way that the diode will be forward-biased. Observe the behavior of the pointer needle.
- Reverse the test probe. This time the diode will be reverse-biased. Observe the behavior of the pointer needle.
- Evaluate the meter deflections using the guide below.
- A diode is GOOD if:
- in forward bias test the pointer needle deflects to the right.
- in reverse bias test the pointer needle stays at the original position.
- A diode is OPEN if the pointer needle stays to its original position both in forward and reverse bias.
- A diode is SHORTED if the pointer needle deflects to right side of the scale near zero ohms, both in forward and reverse bias.
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| A diode is GOOD if: in forward bias test the pointer needle deflects to the right. in reverse bias test the pointer needle stays at the original position. |
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| A diode is OPEN if the pointer needle stays to its original position both in forward and reverse bias. |
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| A diode is SHORTED if the pointer needle deflects to right side of the scale near zero ohms, both in forward and reverse bias. |
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