Step 1: Access the Multimeter Function

Step 2: Insert Probes Correctly

Step 3: Test Continuity in Fully Automatic Mode

• Short the two probes together (touch their tips to each other).
• A valid connection will show zero ohms on the screen, indicating the circuit conducts electricity properly.

Step 4: Limitation of Fully Automatic Mode for Diodes

Step 5: Switch to Diode Continuity Mode

Step 6: Retest Continuity in Diode Continuity Mode

• Touch the two probes together again.
• This time, the screen will indicate conduction and emit a sound (the familiar “buzzer mode”). The buzzer provides an audio cue, so you don’t need to constantly monitor the screen.

Step 7: Test a Diode Accurately

1. Identify the diode’s polarity: Look for the white stripe on one end—it marks the cathode (negative terminal).
2. Connect the probes: Attach the black probe to the diode’s striped end (cathode) and the red probe to the other end (anode, positive terminal).
3. Check the reading: When a normally functioning diode is connected correctly, the screen will present the corresponding forward voltage drop. This value is a direct indication that the diode has the ability to conduct, indicating that its performance is normal.