PLCs: Measuring common mode voltage

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==> Automation List post by Lew McKinney...
To view or reply to this thread: http://www.control.com/thread/1246433793#1246470620


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Re: PLCs: Measuring common mode voltage 
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One of the easiest ways to view a signal like this is to use a dual trace scope of sufficient BW.  Connect the gnds of the probes together, and place one probe on one wire and the other probe on the other, since this is a "balanced" line. Then put the scope in the "add" and "invert" mode.  This will display the composite signal of both lines "added" together showing you what the signal actually looks like.  

Hope this helps.
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