Freaky Amazing DMM?!

Jan 15, 2009 181 Replies

I am not denying that. I am just saying I have never seen an electrician with one.

Hey, give me little credit. We have both been on this group for awhile, and I am aware of your electronics background.

Ben Miller

Benjamin D Miller, PE www.bmillerengineering.com

What you're discribing is call phantom voltage; It's a result of capacitance between conductors. The high input impeadance (10 MOhms) of a DMM can cause you to get a reading on a conductor if it is in close proximity to another live conductor. Wires running along inside of a conduit will have high capacitance because the wire you are testing and live wires are running parallel to eachother over a long distance.

Shaun

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required