Semiconductor Diode By Sasmita November 27, How to test a Diode with a Multimeter Before going for the assembly of the basic electronic components in any particular circuit, it is always advisable to test the components about their working condition or functioning, to avoid the undesired outcome. So we need to conduct some testing procedures for the main components in the circuit to know their proper working. So, let us look on how to test diodes with a multimeter. How to test a diode The diode is a two terminal semiconductor device which allows the current flow only in one direction. These are found in many applications such as rectifiers, clampers, clippers and so on. The testing of the diode is done to know its proper working conditions in forward and reverse bias modes.
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Click here to see the preview of the book on more testing secrets! It can become open circuit, short circuit, leaky and breakdown when under full load. Ananalog multimeter or digital multimeter can be used to test or check for all the first three conditions except the last one which is the diode breakdown in full operating voltage.
I could explain to you in details why i preferred analog meter. I do not know about you because i really came across quite a number of diodes where it tested ok with digital multimeter but failed when check with analog multimeter.
The first step on how to test a diode accurately is to remove one of the diode lead. To be absolutely sure, you will need to lift, or disconnect, one diode lead from the circuit to avoid back circuits. Unless you are very sure about the board you are checking. Sometimes i do found bad diodes when checking it on board.
Your experienced will tell you when to test a diode on-board or off-board. Touch the black probe of your meter to the cathode and red probe to the anode, the diode is reverse biased and should look like an open reading-the meter pointer not moving.
Connecting the red probe of your meter to the cathode and black probe to the anode, the diode is forward biased and the meter should read some value of resistance. If you get two readings then most probably the diode is shorted or leaky and you should replace it. The real problem when testing a diode using the diode test function of a digital meter is that an open or leaky diode, the meter sometimes reads okay 0.
This is due to the digital meter diode test output voltage which you can measure the output test probe using another meter is around mv to 2v. The 3V voltage is adequate to show you the accurate reading of a diode when under test. The output voltage of x10k ohms is about 12 Volt remember the 9 volt battery in your meter Again the diode under test should show only one reading. This is exception to Schottky diode where it have two readings but not shorted reading.
If the meter showed one reading then the diode under test is good. If it has two readings then most probably the diode is either shorted or leaky. If a diode breakdown when under full load, there is no way to test the diode unless you have a very expensive diode checker or tester which is specially designed to track this type of fault. Substituting with a known good diode is often the only way to prove that an intermittent diode is causing a particular problem. Sometimes an intermittent diode could be locate using a coolant spray and hair blower.
Caution: Be certain that power is removed from any circuit before performing any of the following diode checks, otherwise meter or circuit damage could result.
Аналоги для 1n5406
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