Page 75 - Testing Electronic Components

characteristic of a good working zener diode and don’t think that the
meter shows two reading means the zener diode is faulty.

If you get two reading when you measure a normal diode, then the
diode is shorted. As I mentioned above, testing zener diode is totally
different from checking a normal diode.

When you connect your probe and measure a 13 volt zener diode and
above voltage, it should show only one reading using the times 10 K
ohms range. That's mean when you are touching the red probe to the
cathode and black probe to the anode. Reversing the probe should not
show any reading.

If the result shows two readings then the zener diode is confirmed to be
shorted or have developed a leakage. Start measuring zener diode taken
out from your component's rack or from scraped electronic board,
compare a good zener diode and a shorted one and see for yourself.

Write it down in your book what are the results that you get when
comparing and checking a good and a bad zener diode. It would not take
you a long time to become familiar in testing a zener diode accurately.
One more tip, replace only a zener diode with the same or higher wattage.
If possible use the exact voltage and watt if you want the equipment that
you repair to last longer.

Use analogue multimeter to test zener diode

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