ground loop detection

Discussion in 'General Electronics Chat' started by bug13, Mar 2, 2016.

  1. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
    1,208
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    Hi guys

    I am researching a practical technique to detect if a ground loop exists. So my question is:
    What are the techniques that are available to detect ground loop.

    Thanks guys!!
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,003
    3,232
    This sounds like homework.
    So your "research" so far has consisted of asking us the answer to your question?
     
  3. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
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    38
    This is not a homework :)

    So far, I can only find something using an exciter to inject some signal into the ground loop, then using a coil to pick up the same signal. From the amplitude of the pick up signal, we can tell there is a ground loop or not.

    But I am hoping to find something better.
     
  4. #12

    Expert

    Nov 30, 2010
    16,278
    6,791
    Ground loops are some of the most frustrating things I have ever dealt with. If you find a machine to replace the human mind for that job, be sure to post it!
     
  5. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
    1,208
    38
    I came across this, have you used these? Do they work??

    http://www.loopslooth.com/how to find ground loop.html
     
  6. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
    1,208
    38
    So I have this idea, if I have multiple current sense devices placing on the ground line, take lots of reading over a period of time (say 10s), average the result. Send the data wirelessly to a host. And I should be able to work out where the ground loop might be.

    My questions are:
    • How do I synchronize this event wirelessly so all devices can start reading current at the same time?
    • If I can't synchronize this event, say I can only start this event within + and - 10ms of time, can I still get some useful data if I take lots of reading over a longer period time (say 30s)?

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