Created by: Glen Zhu | Updated Date: January 16th, 2025
When there is no professional surge protector testing equipment, some people want to use a multimeter for testing.
Testing a surge protector with a multimeter is a straightforward process, but it requires caution to ensure safety.
It should be noted that the core component of a surge protector is MOV (metal oxide varistor), a nonlinear and high-impedance device.
A surge protector is designed to protect your devices from voltage spikes, and testing it can help verify its functionality. Here’s how to do it:
What You’ll Need:
Let’s take type 2 surge protector device (SPD) SLP40-275/3S+1 for example, to check the MOV module of SLP40-275/0.
Turn the function dial to the ‘mV (DC)’ position, connect the test leads with ‘L’ and ‘N’, the screen displays 0. See the image as below:
Turn the function dial to the ‘Ω’ position, connect the test leads with ‘L’ and ‘N’, the screen displays none. See the image as below:
Note: MOV is high-impedance component, so there is no any indiation when turn the function dial of multimeter to the ‘Ω’ position to test.
Turn the function dial to the ‘mA (DC)’ position, connect the test leads with ‘L’ and ‘N’, the screen displays 0. See the image as below:
The Metal Oxide Varistor (MOV) is in a high-resistance state, using a multimeter to measure resistance can not distinguish whether the surge protector device is damaged or not.
We recommended to use a professional surge protector test equipment for detection, details please visit this page https://lsp.global/how-to-check-surge-protection-device/
Those are articles written with AI tools by people who don’t understand surge protector device, and have not been actually operated or verified. So what the Internet says about measuring surge protection device with multimeters is false.
LSP’s reliable surge protection devices (SPDs) are designed to meet the protection needs of installations against lightning and surges. Contact our Experts!
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