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Connect ground

Discussion in 'General Electronics Discussion' started by René Gothe, Feb 7, 2018.

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  1. René Gothe

    René Gothe

    3
    0
    Feb 7, 2018
    Hi there!
    Right now, I work with my Picoscope, PC and transformer.
    Combined with my picoscope, I have two probes with a "ground cable" attached to each probe.

    I´m about to meassure the drop voltage on 3 electronic items, and the idea in order to not frie my Pico is to connect the item
    and my transformer at the same time in a common output.
    So that was my task.
    But I´m not sure where I can connect my ground from the probe?
    Kind of a crucial connection to avoid potential damages, so it has to be right, and therefore I choose to ask you guys here.
     
  2. Minder

    Minder

    3,100
    664
    Apr 24, 2015
    If any part is connected to a PC input without any form of isolation, the input will be referenced to earth ground in any case.
    The normal practice for 'scope type of equipment is to ensure the AC supply is isolated, as the 'scope lead common is normally connected to earth ground.
    This is a practice when working on equipment that has no galvanic isolation from the AC mains supply.
    You would need to determine if the pico probe commons are isolated from earth ground.
    M.
     
  3. René Gothe

    René Gothe

    3
    0
    Feb 7, 2018
    Good point about the earth ground, but my pico probe commons are infact isolated from earth ground.
     
  4. Minder

    Minder

    3,100
    664
    Apr 24, 2015
    Then quite possibly there is no concern.
    M.
     
  5. René Gothe

    René Gothe

    3
    0
    Feb 7, 2018
    Ok, thanks!
     
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