To check a diode (which you might be referring to as "dioad"), you can use a digital multimeter or an analog multimeter. Here's a step-by-step method for both:
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✅ Using a Digital Multimeter (DMM)
1. Turn the multimeter to Diode mode (symbol: ➤|—).
2. Disconnect the diode from the circuit if possible.
3. Place the probes:
Red probe to the anode (positive side).
Black probe to the cathode (negative side — usually marked with a stripe).
4. Read the display:
If it shows 0.5V to 0.8V, the diode is good (for silicon diode).
If it shows OL (overload) or no reading, reverse the probes.
5. Now reverse the probes:
Red probe to cathode, black to anode.
The reading should be OL or no conduction.
If both directions conduct (shows voltage both ways), the diode is faulty (shorted).
If no conduction in both directions, diode is open (damaged).
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✅ Using an Analog Multimeter
1. Turn the meter to Resistance mode (Ohms).
2. Place red probe to cathode, black to anode.
(Analog meters have polarity reversed than DMMs)
3. Needle should move (low resistance) in one direction (forward biased).
4. Reverse the probes:
Needle should stay at infinity (no movement).
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📌 Diode Testing Results:
Condition Forward Bias Reverse Bias Result
Good Diode Shows ~0.6V No reading OK
Shorted Diode Shows voltage Shows voltage Faulty (Short)
Open Diode No reading No reading Faulty (Open)
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