This just a simple test to verify if the diode is working at all.

Best to test components out of circuit.

1. Set the meter to test for ohms. Any range will work.

2. Connect the Positive probe to the cathode side of the diode and the Negative probe to the anode side of the diode. (Cathode is the side marked with a band)

3. You should get a low reading.

4. Now switch the probes, Positve to anode and Negative to cathode.

5. You should see a high resistance reading.