Electronics > Metrology

CM noise problems with ethernet connected instruments

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tkamiya:
All it takes is one device with poor design/construction to compromise the galvanic isolation though.  If it's the switch itself, the whole idea is shot.  We are talking about millivolts here....

I would disconnect one device at a time and see where the problem is happening.  Guessing at it will quickly get expensive.  For a complete solution, if you cannot resolve the problem, I would try media converter and insert an optical link in the connection for the line going to the cause you've isolated.

Good luck!

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