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How to distinguish Zener diodes from ordinary rectifier diodes

What is a Zener diode? For the understanding of Zener diodes, what everyone knows may be relatively superficial. Today, the editor will use ordinary rectifier diodes as a comparison, so that everyone can have a deeper understanding of Zener diodes.

First, use the R×1K block of the multimeter to judge the positive and negative electrodes of the tube under test. Then turn the multimeter to the R×10K block, connect the black test lead to the negative pole of the tube under test, and connect the red test lead to the positive pole of the tube under test. Much smaller, indicating that the tube under test is a Zener tube;

Conversely, if the measured reverse resistance value is still large, it means that the tube is a rectifier diode or a detection diode. The reason for this identification method is that the voltage of the battery used inside the R×1K block of the multimeter is 1.5V, and generally it will not reverse the breakdown of the tube under test, so that the measured resistance value is relatively large. When measuring with R×10K gear, the voltage of the internal battery of the multimeter is generally above 9V. When the measured tube is a voltage regulator tube, when the voltage regulator value is lower than the battery voltage value, it will be reversely broken down, so that the measured The resistance value is greatly reduced.

However, if the tube under test is a general rectifier or detector diode, no matter whether it is measured with the R×1K block or the R×10K block, the obtained resistance value will not differ greatly. Note that when the regulated voltage value of the measured Zener diode is higher than the voltage value of the R×10K block of the multimeter, it is impossible to distinguish and identify with this method.

The above is the difference between Zener diodes and ordinary rectifier diodes. Have you learned it yet? If you want to know more knowledge about Zener diodes, please call the editor.