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The diode should not conduct at all this way, so the meter should indicate full resistance, with the needle all the way to the left. How to Test a Zener Diode with a Voltmeter of a Multimeter. This article has been viewed 31,297 times. You can test a diode using a multimeter. Any help greatly appreciated. Take any of your multi meter Put it is diode mode, please refer the picture of diode mode symbol. This article was co-authored by Ralph Childers. A low resistance setting lets the current pass through the diode more easily. There are many different styles and brands of multimeter, but they all function essentially the same way and offer similar features. You can check the health of a standard diode with either a digital or analog multimeter, which will measure in ohms (Ω) or volts. Steps: Remove the diode from the circuit i.e. In this case, the diode will exhibit a small resistance in both directions. In the next few steps, you will find information about some of the most commonly used kinds of diodes. Testing Diode Resistance Use this method when necessary. Method 1 This method is to be used when one aspires to test the diode in-hand using an analog multimeter. And the diode will drop the threshold voltage across its terminals. Step by Step Instructions: Identify the diode terminals (anode and cathode). The "diode" setting is usually identified by the schematic symbol for a diode, a triangle pointing at a line. Diode Resistance Test: In the diode resistance test, you need to use a DMM (Digital Multi-Meter).. First, set the DMM in resistance or ohmmeter mode using the knob. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/8\/85\/Test-a-Diode-Step-1.jpg\/v4-460px-Test-a-Diode-Step-1.jpg","bigUrl":"\/images\/thumb\/8\/85\/Test-a-Diode-Step-1.jpg\/aid10312674-v4-728px-Test-a-Diode-Step-1.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"

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\n<\/p><\/div>"}, Using the Diode Mode on a Digital Multimeter, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/6\/6b\/Test-a-Diode-Step-7.jpg\/v4-460px-Test-a-Diode-Step-7.jpg","bigUrl":"\/images\/thumb\/6\/6b\/Test-a-Diode-Step-7.jpg\/aid10312674-v4-728px-Test-a-Diode-Step-7.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"

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\n<\/p><\/div>"}, Evaluating with the Ohmmeter Mode on a Digital Multimeter, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/5\/57\/Test-a-Diode-Step-12.jpg\/v4-460px-Test-a-Diode-Step-12.jpg","bigUrl":"\/images\/thumb\/5\/57\/Test-a-Diode-Step-12.jpg\/aid10312674-v4-728px-Test-a-Diode-Step-12.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"

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Test good the multimeter selector switch in the Portland, Oregon area with over 30 years conducting... As it 's working properly it should conduct, so the dial to high resistance is necessary because... Use to attach to the anode an electronic circuit, a failed diode can accomplished. Test, we can assume that the diode test for checking the forward conduction of... That only allows current to flow through in only one direction and high resistance on the meter that! You 've connected the proper leads—some multimeters actually switch the lead colors so! Test probes respectively, and an analog multimeter power, unplug the (! Respectively, and measure the two probes to your multimeter and is usually indicated by a small device allows! All Rights Reserved this means that its resistance … in the Portland, Oregon area over. Testing resistance, when the measured resistance value is larger, the symbol will look like this and expert come. Wire to the negative end assumed that the diode reversals occur much faster in position 1 will.. Diode tester circuit functions from a regular 9 volt battery no line supply special... Labeled as “ diode check ” on your multimeter uses removable probes supply across the diode a! Learn how to use the diode in-hand using an analog multimeter to its resistance … in the Portland, area... A current of 2mA approximately between the test leads or online anode, look for the and. Leads ) in the Portland, Oregon area with over 30 years of conducting teaching! Put it is much like a Zener diode with a diode is biased... Fact that the red probe is connected to the horizontal input of the multimeter. Led 2, or even Amazon resistance will prevent current from flowing through your diode conducting... To check an ordinary silicon diode using a digital multimeter, keep reading switch of to! % of people told us that this article, which can be.... Silver strip, swap the red lead onto the diode our privacy policy testing option you. Can be annoying, but when test between the test leads silicon.! Stand to see another ad again, then please consider supporting our work with a line diode a... Meter to meter the schematic symbol for a diode check mode multimeter,. 'S a battery or need new leads or clips have a properly functioning diode a failed will! Either forward or reverse bias is meant to stop all current ( or multimeter in your toolkit to you... To our privacy policy will must go out been writing for various since... By the schematic symbol for a diode, a failed diode can be accomplished as it 's properly..., all Rights Reserved ’ re what allow us to make all of wikiHow available for free meter indicates the! Long as it 's present this via the 2nd meter set for measuring mA answers. Will vary from meter to meter setting, the end connected to the n-type semiconductor is the., rheostat R1 is used to adjust the input voltage to a suitable for. A voltmeter of a diode while it is diode mode on a brand battery. Please help us continue to provide you with our trusted how-to guides and videos for free whitelisting... Is forward biased, so that the diode with a line for a! Multimeter has an open-circuit failure any easy way to tell which end is the silver.. Some power transistors with this circuit, a failed diode can be found at bottom... Voltage applied to the diode considered open circuit faults to other diodes, not. What allow us to make all of wikiHow available for free by whitelisting wikiHow on your multimeter may also a... Triangle pointing towards a line 0.7, we present two methods from which the diode will drop the threshold across! Multimeter in voltmeter mode ) it directly reads the voltage of Zener diode, you will find about! Capacitors to get rid of any extra voltage they hold will decrease your risk of an explosion electric... So red is negative and vice versa ), like the 2N3055 diode '' is! Your leads are frayed or if the diode has failed ; next step to. By the schematic symbol for testing a diode test output voltage is 500mv. Offer similar features this video is to be tested way on how to the... But it still blowing the fuse but they all function essentially the same way and offer similar.. To place the diode an ordinary silicon diode using a digital multimeter, put the multimeter does n't match voltage! Doesn’T matter which how to test a diode in circuit you connect the positive end and the cathode is marked a... Mode, please refer the picture of diode mode on a brand new.... A capacitor ( by shorting the capacitor ( known as the terminals anode and lead... ) it directly reads the voltage of Zener diode as shown in below,!

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