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earth tester

Discussion in 'Electronic Design' started by mansoor, Dec 4, 2005.

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  1. mansoor

    mansoor Guest

    every body ! kindly ;show me the way that I can design my own earth
    tester,I need to a circuit diagram.
  2. Phil Allison

    Phil Allison Guest

    ** So you want an electronic soil analyser ?

    These Google Groupies are such a hoot.

    ........... Phil
  3. legg

    legg Guest

    Test for what?

    Static discharge safe limits?

  4. mansoor

    mansoor Guest

    thanks . to measure soil resistivity.
  5. mansoor

    mansoor Guest

    thanks . to measure soil resistivity.
  6. Ken Smith

    Ken Smith Guest

    How far down into the soil do you want to be able to see?

    Do you want a profile or just a single value?

    Is your local mains frequency 50Hz or 60Hz?

    I'll assume 60Hz

    (1) Make a good 30Hz square wave that is isolated from any other earthing.
    This needs to be about 25V and able to output several amps.

    (2) Make a synchronous detector circuit. Followed by a filter that cuts
    off at about 0.5Hz.

    (3) Sync the detector (2) to the generator (1) via an opto isolator.

    (4) Drive large spikes (1cm Dia 20cm long) into the soil like this

    ASCII Art:

    ---I--- ---V---
    ! ! ! !
    V V V V

    (5) Measure the voltage you get for some known current and apply a
    "geometry factor" to get the resistivity.
  7. Whether or not he's on earth. ;-)
  8. Ben Bradley

    Ben Bradley Guest

    Immunity to excessive heating?
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