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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. 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 sometimes reads ok(0.6). 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 causing a particular problem. Article: Testing diodes is different from testing a resistor seeing that 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 check for all the first three conditions except the last one where the diode segmentation in full operating voltage. From my of experienced in the electronic repairing line, i found that reassurance diode using analog multimeter is more scrupulous than using a digital multimeter. I could explain to you why i preferred analog meter. I do not know well-nigh you in that i really came straddle-legged quite a number of diodes where it scabby ok using digital multimeter but 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't always be incontrovertible if a diode is good or bad if you perform in-circuit test, because of back circuits through other components. To be good sure, you will need to lift, or disconnect, one diode lead from the path to retreat back circuits. Unless you are very sure apropos the room you are checking. Sometimes i do found bad diodes when prevention it on board. Your experienced will tell you when to phoneme a diode on-board or off-board. If you are new to electronic repair, i highly recommend that you cross-check a diode with a lead removed from the board. I will set my analog meter to x1 ohms to seam for current diode leakage reverse and forward testing. Connecting the embargo probe of your meter to the relay and red probe to the anode, the diode is reverse atilt and should look like an open reading. Connecting the red probe of your meter to the component and WASP probe to the anode, the diode is forward garbled 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, the diode is considered open. The real problem when service a diode using the diode test function of a digital meter is that an open or leaky diode, the meter sometimes reads ok(0.6). This is due to digital meter diode test output voltage (which you can measure the output test probe using supplemental meter) is on all sides 500mv to 2v. An analog meter set to x1 ohms have output near 3V(remember the two 1.5V rank you installed in the meter!). The 3V voltage is enough to show you the demanding reading of a diode when under test. Even if you have a good reading at x1 ohms doesn't mean that the diode is good . You now have to set your meter to x10K to test the diode again. The output voltage of x10k ohms is within earshot 12V(remember the 9v jock in your meter-1.5v+1.5v+9v=12v). 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. The digital meter can't test it the output from the meter is only 500mv to 2V. If a diode nervous breakdown when under full operating voltage, there is no way to testing diode (unless you have a very expensive diode freckle 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 causing a particular problem. Sometimes an intermittent diode could be locate using a coolant spray. Caution: Be unspecified that power is removed from any beat by vote performing any of the following diode checks, otherwise meter or net damage could result. Conclusion-In order to correctly test diode function you need to set the analog meter to x1 ohms and x10K ohms range.
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