How to Test a Diode?

Diode checking method, #Shorts
By using DMM (Digital Multimeter) we can check the diodes, whether they are OK or Faulty,
DMM's have Diode test mode,

Diodes have two terminals Anode(+) and Cathode(-),
If we connect the Red probe of DMM to the Anode of a diode, and the Black probe of DMM to the Cathode of the diode, Then the internal battery of DMM makes the diode in forward-biased condition, So the DMM display shows a voltage drop of 0.5 to 0.8 volts,

If we Reverse the DMM probes means by connecting the Black probe to Anode and the Red probe to Cathode the diode gets reverse-biased, Hence the DMM displays OL (Overload) reading.

If the Diode passes these two tests then we can consider the diode "OK",

For a Bad diode, the DMM displays OL in both directions, Then it's an opened diode.

If the DMM displays the same voltage drop reading in both directions, then it's a shorted diode.

The links for related videos:

1) How to test a Transistor
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2) How to test a FET
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3) How to test a MOSFET
   • Видео  

4) Diodes and SMD Diodes coding schemes
   • Diodes and SMD Diode Codes Explained ...  

5) PN Junction Diode
   • PN Junction Diode and V-I Characteris...  

6) Semiconductors
   • Semiconductor: P-Type and N-Type, Int...  

This video is helpful for students and working professionals,

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