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The operation of testing LEDs with a digital multimeter is quite simple, a clear reading from the measurement will indicate the brightness of each bulb. The brightness of the LED when tested also shows the quality of the lamp. If you don’t have a multimeter, you can use a coin cell battery case with wires to check if the LED is still working.
Steps
Use a multimeter
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Buy a digital multimeter that has a diode measurement feature. Basic multimeters can only measure amps, volts, and ohms. To test the LEDs you need to use a multimeter with the diodes installed. Since this function is not usually available on low-cost models, you should consult the mid-to-high-end segment online or your local electronics store. [1] X Research Source
- A good quality mid-range multimeter will cost between 1,000,000 – 2,500,000 VND.
- You should buy a digital multimeter instead of analog models because the analog face will be difficult to read and not as accurate.
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Connect the black and red probe wires. The black and red probes need to be connected to the ports located on the front of the multimeter. The red lead is used to measure the anode. The black wire needs to be plugged into the “COM” port and used to connect to the negative terminal. [2] X Research Source
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Turn the knob on the multimeter to diode mode. Turn the knob located above the multimeter clockwise out of the “off” position. Keep rotating until the arrow points to the diode setting. If not clearly marked, this setting may be indicated by a diode circuit symbol. [3] X Research Sources
- Diodes have symbols that represent both the positive (anode) and negative (cathode) terminals of the circuit.
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Connect the black probe wire to the negative terminal and the red wire to the positive terminal. Touch the black probe to the cathode of the LED (usually with shorter prongs). Next, connect the red probe to the longer prong anode of the lamp. You need to connect the black probe first and then the red one, because doing the opposite will not get the correct reading. [4] X Research Sources
- Check to make sure that the cathode and anode are not in contact during the measurement, so that the current flows through the LED and gives the correct result.
- The red and black probes should also not touch each other during the test.
- If you connect it properly, the LED will light up.
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Check the value on the digital display of the multimeter. When the two probes touch the cathode and anode, the undamaged LED will give an reading of approximately 1600 mV. If no indicator appears on the screen, repeat the measurement to make sure you have the correct connection. If you proceed properly and still no indicator, the LED has failed. [5] X Research Sources
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Evaluate the brightness of the LED. When you test properly, the LED will light up. Record the reading on the electronic screen, then observe the LED. If the readings are normal but the light seems dim, this is most likely a low-quality LED. High-performance LEDs will give off a bright light. [6] X Research Sources
Test with coin pin
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Use coin batteries to test LEDs safely, without burning the bulb. Coin batteries are the safest option because the voltage is low enough to not cause damage. Any other type of battery has the potential to burn out the LED. Coin batteries are available at drugstores, grocery stores, hardware stores, or online. [7] X Research Sources
- You can use CR2032 or CR2025 coin batteries.
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Purchase a coin cell battery case with appropriate leads. Purchase a carrying case with a lead designed for the coin cell battery you will be testing (e.g. CR2025). You can buy these types of cases online or at a hardware/electronics store. [8] X Research Sources
- Coin battery cases are often used to attach batteries for small projects such as jewelry or clothing with LED lights.
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Connect the black probe to the negative terminal, and the red lead to the positive terminal of the lamp. To test the LED, touch the black probe to the cathode or shorter prong of the lamp. Then connect the red probe to the anode with the longer prong. Check to make sure that the two probes do not touch each other during the measurement, and that the anode and cathode of the lamp are the same. [9] X Research Source
- Some battery cases will come with a small connector at the end of the two leads.
- If the battery case has a connector, plug the positive and negative poles of the LED into the small hole that aligns with the red and black leads.
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Bright LED lights. If the lamp is working properly and the connection is made properly, the LED will light up. If not, try swapping the anode and cathode and reconnecting. If the bulb still doesn’t light up, it’s most likely burned out or faulty. [10] X Research Source
- If the LED does not light, try testing other LEDs shortly after. If the bulbs then light up normally then you can be sure that the first LED is not working.
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This article is co-authored by a team of editors and trained researchers who confirm the accuracy and completeness of the article.
The wikiHow Content Management team carefully monitors the work of editors to ensure that every article is up to a high standard of quality.
There are 7 references cited in this article that you can see at the bottom of the page.
This article has been viewed 3,088 times.
The operation of testing LEDs with a digital multimeter is quite simple, a clear reading from the measurement will indicate the brightness of each bulb. The brightness of the LED when tested also shows the quality of the lamp. If you don’t have a multimeter, you can use a coin cell battery case with wires to check if the LED is still working.
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