For a good diode, the forward bias resistance should be few hundreds of Ohms to few Kilo Ohms and the reverse bias resistance should be very high (usually indicated as OL – open loop in a multimeter). In the Resistance Mode Test of the diode, both the forward and reverse bias resistances of the diode are measured. A normally working diode will allow current to flow in forward bias and must have voltage drop. In this method, the diode is put in forward bias and the voltage drop across the diode is measured, using a Multimeter. The Diode Test Mode is the best way to test a diode as it relies on the characteristics of the Diode. The diode testing using a Digital Multimeter (DMM) can be carried in two ways because there are two modes available in DMM to check the diode.
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How to Test a Diode using a Digital Multimeter? NOTE: If the diode you want to test is already in a circuit (on the PCB), then you can perform the following mentioned tests by removing / de-soldering only one lead of the diode. NOTE: The below mentioned testing procedures are only for normal PN diode. The testing of a diode can be carried in different ways, however here we have given some basic testing procedures of the diode. Some diodes may have a different color band (for example, some Zener Diodes have a Black marking on its Red / Orange body), but the terminal near this colored mark is almost always the cathode. Both through-hole and surface mount Diodes have this marking. Most of the PN Junction diodes have a white band on its body and the terminal near this white band is the cathode. This is the minimum potential difference between Anode and Cathode of the Diode to become forward biased.īefore testing a diode, we have to first identify the terminals of the diode i.e., its Anode and Cathode. The forward-biased diode voltage drop is typically 0.7V for Silicon diodes.
When the anode terminal of the diode is made positive with respect to cathode, the diode is said to be forward-biased. These are found in different applications like rectifiers, clampers, clippers and so on. The diode is a two terminal semiconductor device that allows current to flow only in one direction. As mentioned earlier, diodes are one of the important components in electronic circuits, especially in Power Supplies (and there are many other applications of diodes). Let us focus on Testing Diodes in this tutorial. In the worst case scenario, if we do not perform any tests before assembly and if the output is not as expected, then it is very difficult to identify the source of the problem and we have test all the components (which is very difficult after assembling). To avoid getting undesired results, it is advisable to test all the basic components like a resistors, diode, LED etc., for their normal working or operation before assembling the components in a circuit (PCB). Having knowledge on how to test a component and assessing whether it is good or not is a very good electronic circuits troubleshooting skill. Learn more about the basics of Semiconductor Diodes.
You don’t have to understand its construction and internal working but at least some basic knowledge on how a component works, how to test a component and see whether the component is working properly or not. If you are starting to develop your own electronics project or if you want to troubleshoot any electronic circuit or project, then you must have a sound knowledge on basic electronic components and their working.
Ohmmeter (Resistance) Mode Testing Procedure.How to Test a Diode using a Digital Multimeter?.
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