AC meter basics

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In the series on 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

RV Electricity – Just Ask Mike (J.A.M.): AC meter basicsNow 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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