Keep in mind that diode in forward-biased acts as closed switch which let to flow current in it like conductors. The best practice to test a diode in “Diode test” mode by measuring the voltage drop across the diode in case of forward biased. Testing Diode using DMM (Diode Test Mode + Resistance Mode) Testing Diode using DMM (Diode Test Mode + Resistance Mode) How to Test a Diode using Digital Multimeter Related Tutorial: How to Test a Capacitor by DMM & AMM – 6 Methods.Below is a tutorial that shows how to test a normal PN Diode, LED, and Zener Diode by different methods.ĭiode can be check and tested by 4 methods using digital or analog multimeters. In other cases, there are different colors are used and the color coated sides are cathode as shown in fig below. In most cases, there is a white band color coating on normal PN junctions diodes which indicates as cathode terminal and the rest is anode. Cathode to positive and anode to neutral is called reverse bias and diode is acts as open switch which is know as reverse bias (This case is reverse in case of zener diode).īefore testing a diode, We must know the diode terminals like Anode (+) and Cathode (-). When the cathode terminal of diode is connected to the neutral and anode to positive, It is called in forward bias position and it acts like a short switch where current starts to flow through it. Diode Terminal Identification (Anode + Cathode) It is the most used component in different electronic designs and systems like rectifiers, LED lights related circuits, voltage multiplying circuits, solar panels, logic gates etc. Related Tutorial: How to check a Transistor by Multimeter (DMM + AMM)ĭiode is a simple PN Junction and two terminal device which allow to flow current though it in one direction (Forward Bias).Today, we will have to discuss how to test a diode using DMM and AMM by 4 methods. For this purpose, we have started some Digital and Analog multimeters tutorials where we will discus how to test different electrical and electronics components. Sometimes, we get unexpected results and we must perform some tests to find whether the component and device is working properly or we should replaced with a new one. It is advisable to test component before assembling and placing in a circuit. Troubleshooting in electronic and electrical engineering is an important part and one must know the basic skills and knowledge about the components to design and troubleshoot a circuit. Troubleshooting Electronic Devices & Components How to Test a Diode using Analog Multimeter.How to Test a Diode using Digital Multimeter.Troubleshooting Electronic Devices & Components.

Bridge rectifier troubleshooting