Deep Troubleshooting with a Multimeter

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NVCT VS OUTLET TESTER VS MULTIMETER

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What happens here

The final electrical tool demonstrated is a Multimeter (Klein Tools MM400). The creator shows how to use the multimeter's voltmeter function by inserting its probes into an electrical outlet. When measuring between the hot and neutral terminals, it reads approximately 119 volts. However, when one probe is moved to the ground terminal, the reading drops significantly to about 4 volts. This discrepancy, despite the outlet tester indicating 'open ground,' allows for deeper investigation, indicating that while there is some voltage on the ground wire, it is not properly grounded.

Goal: Illustrate how a multimeter provides precise measurements for diagnosing complex electrical issues.

Tools and materials

Electrical Outlet — To be tested with the multimeter
Klein Tools MM400 Multimeter Klein Tools — Measuring actual voltage (AC volts) in an electrical outlet for detailed diagnosis

What they say

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testing your GFCIs. And a multimeter lets me troubleshoot deeper into electrical problems. I'll show you. We're getting in about 119 volts. Now, if I move this to the ground, it should read the same. And we're reading right about 4 volts. So, the outlet tester told me I have an open ground, but the multimeter let me investigate further. Non-contact voltage tester for speed, outlet tester for

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