GDC Server » The first step on how to test a diode is

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Testing Diode-The Accurate Way on How to Test Semiconductor Diode Using Multimeter Technology Articles | June 14 Cheap Kyrie 2 Shoes , 2005

Testing diodes is different from testing a resistor because you need a skill to do it.If you do not know or wrongly test a diode you will be unable to repair the equipment.

A bad diode you think it is good. This will definitely waste your precious time.



A rectifier diode can fail in one of the four ways. It can become:

Open Shorted Leaky Breakdown when in full operating voltage

An analog multimeter or digital multimeter can be used to checkfor all the first three conditions except the last one where the diode breakdown in full operating voltage. From my of experiencedin the electronic repairing line, i found that checking diode using analogmultimeter is more accurate than using a digital multimeter. I could explain to you why i preferred analog meter. I do not know about you because i reallycame across quite a number of diodes where it checked ok using digital multimeterbut failed when test with analog meter.


The first step on how to test a diode is to remove one of the diode lead. You can'talways be certain if a diode is good or bad if you perform in-circuit test, becauseof back circuits through other components. To be absolutely sure Cheap Kyrie 1 Shoes , you will need tolift, 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 check a diodeon-board or off-board. If you are new to electronic repair Cheap Kyrie Shoes For Sale , i highly recommend that you check a diode with a lead removed from the board.


I will set my analog meter to x1 ohms to check for current diode leakage reverse andforward testing. Connecting the black probe of your meter to the cathode and red probeto the anode, the diode is reverse biased and should look like an open reading. Connectingthe 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 have two readings then most probably the diode is shorted or leaky and you should replace it. If you don't get any reading either forward or reverse bias Cheap Kyrie Youth Shoes , the diode is considered open.


The real problem when checking a diode using the diode test function of a digital meter is that an open or leaky diode, the meter ut voltage of x10k ohms is about 12V(remember the 9v battery in your meter-1.5v+1.5v+9v=12v). Againthe diode under test should show only one reading. This is exception to Schottky diodewhere it have two readings but not shorted reading. If the meter showed one reading thenthe diode under test is good. If it has two readings then most probably the diode is either shorted or leaky. The digital meter can't test it because the output from the meter is only500mv to 2V.


If a diode breakdown when under full operating voltage, there is no way to testing diode (unless you have a very expensive diode checker which specially designed to locate this type of problem).Substituting with a known good diode is often the only way to prove that an intermittent diode is ca. Cheap Jerseys Cheap Jerseys Cheap Jerseys From China Cheap Authentic Jerseys Cheap Authentic Jerseys Cheap Jerseys China Cheap New Jerseys Cheap Jerseys China Wholesale Cheap MLB Jerseys China Cheap Authentic MLB Jerseys