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Question on ESD mats....

Discussion in 'Electronic Equipment' started by geronimo, Mar 4, 2007.

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  1. geronimo

    geronimo Guest

    Recently my co. got on the ESD bandwagon, they had some technicians
    come in and install a ground point on our test bench, and they gave us
    two sets of ESD mats and grounding straps. I think they are 3M brand.
    The mats have a round metal snap to attach to the workbench ground. I
    checked the resistance of one of these new mats with a Fluke DM 77. It
    was a long time ago, and I don't remember what the reading was exactly
    from the attaching snap contact to the surface of the mat, but I
    remember it was many megohms, if not infinite. I thought at first
    that this cannot function to protect against static charges. But
    possibly it is supposed to be up in the megohm range? I understand
    that to be a dead short to ground would be just as bad. There is
    supposed to be SOME resistance....but how much?
  2. Jim Yanik

    Jim Yanik Guest

    wrist straps? One bench mat,one floor mat?
    IIRC,greater than 500K R,less than 5 megR.
    the 3M mats are measured using specified weights with specified contact
    area,spaced a specified distance apart.

    At TEK,we also had floor mats and had to wear heel straps on our shoes,and
    every morning had to TEST the wrist and heel straps on a 3M tester.The
    wrist straps DO wear out,and you need to test them to insure they are good.

    And we also wore anti-static lab coats.
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