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Where is Ground?

Discussion in 'Electronic Basics' started by zalzon, Nov 1, 2003.

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  1. zalzon

    zalzon Guest

    Hi,
    I bought an anti-static wrist band so as not to zap the components
    I'm working with. It has a 1Mohm resistor. After I've put the wrist
    band on, where do i attach the alligator clip to?

    I've heard I should attach it to the "neutral of an AC main" is that
    true. The thought accidentally attaching myself to the wrong outlet
    pin scares me.

    I know that the material i attach it to should have fewer electrons so
    the electrons in my body flow to that site. But ideally should the
    material be an insulator like wood/plastic or a or a conductor like a
    metal?

    Thanks
     
  2. Either the neutral pin of the AC mains or a cold water pipe. Or you may want
    to put a ground rod outside your building and run a copper lead to your work
    area assuring absolute ground potential. Normally the Neutral of the AC
    mains or Cold Water (Galvanized or Copper) Pipe will suffice. .
     
  3. You need to be connected to earth. In the UK by the earth (green and
    yellow).
     
  4. Bob Masta

    Bob Masta Guest

    If you are working on something with a metal chassis, you
    can just clip to that chassis. Some people use a big mat
    of conductive foam on top their workbench (if the benchtop
    isn't already conductive) and clip to the mat.

    The idea here is not so much to get yourself to any
    absolute potential, but to the ground potential of
    the circuit in question. If you connect to an earth
    ground and your circuit (for some strange reason)
    had a high static charge, there could be destructive
    current flow when you touched it. But if you are
    connected to the circuit ground, that can't happen.


    Bob Masta
    dqatechATdaqartaDOTcom

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
     
  5. default

    default Guest

    Exactly don't trust the neutral. Neutral opens back at the panel or
    along the route and you might have line at the wire leading to the one
    megohm resistor (which would keep you from frying as long as you don't
    touch the wire on the other side of the 1M).

    First choice would be the chassis if it is metal and grounded, second
    choice is still the chassis if it is say the return of the internal DC
    supplies. Clip to the low voltage isolated internal supply rail
    return (DC minus most times).

    The object is that your potential be the same as the device you are
    handling. If you are connected to the neutral and the device is at
    some other potential you could still destroy it. So an unplugged
    device is floating at some potential - you want to be at the same
    potential. I usually just touch the chassis before plugging in a
    computer card, memory, etc..
     
  6. Steve Dunbar

    Steve Dunbar Guest

    You should connect to the AC ground, _not_ the neutral. The ground is the
    round hole below the two parallel slots on the outlet (in the U.S.) There
    should be a green or bare wire connected to it.

    See <http://www.esdsystems.com/whtpaper/index.asp> for more information.
     
  7. norm d.

    norm d. Guest

  8. Ross Mac

    Ross Mac Guest

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