In the series on RVtravel.com: Just Ask Mike (J.A.M.): AC meter basics
This is something every RVer should know and will help in diagnosing electrical problems.
The Meter
Now is the time to familiarize yourself with your Digital Multi-Meter (DMM). Here’s a pretty typical $20 meter that you can purchase at Lowe’s, Home Depot or Amazon. You’ll notice a bunch of strange markings on the selection knob, only a few of which will work to measure AC voltage. Don’t be tempted to just plug the meter leads into a campsite socket and spin the knob. That will guarantee a burned out meter (at the least).
Note the markings on the control knob are divided into four major groups.
- AC V (AC voltage)
- DC A (DC amperage)
- OHM (electrical resistance)
- DC V (DC voltage)
The only group you’ll be interested in today is the AC V section for measuring the 120- or 240-volts AC in a campsite pedestal.
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