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Urgent help need from u

Discussion in 'Electronic Basics' started by joshua, Feb 22, 2006.

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  1. joshua

    joshua Guest

    In weigh scale application can i use load cell (ranges 10kg to 100kg)
    for measure below 5kg?
    whether it is possible? my weigh scale application for only measure
    Food products 0.1 to 100kg.
     
  2. The less of the load cell range you use, the larger noise and
    nonlinearities become, in proportion to your signal.

    It gets to be a little like picking your nose with a back hoe. The
    back hoe doesn't have any difficulty but its jitter and stiction tends
    to leave you noseless... or faceless.
     
  3. John Larkin

    John Larkin Guest

    Good load cells are astonishing. They typically have resolution,
    linearity, and stability in the parts-per-million range. A decent 100
    kg load cell with good electronics will be accurate to a couple grams.
    Of course, the smaller the full-scale range, the better the low-end
    resolution.

    Note that load cells must be zeroed ("tared") and calibrated (using a
    standard weight) regularly. Their as-purchased accuracy can be as bad
    as several per cent off.

    This is interesting: buy, say, 25 small bags of potato chips and note
    the advertised net weight. Now weigh them. You'll usually find that
    none are underweight, and rarely are they more than a percent or so
    over, even though a single chip may weigh several per cent of the
    total. They way they accomplish this is clever and complex.

    John
     
  4. Joerg

    Joerg Guest

    Hello John,

    That can be a problem. We bought a fancy bathroom scale a couple years
    ago. It was ok for a few weeks and then showed me gaining several
    weight, big time. Then losing, then gaining again. It had four load
    sensors in the pods and the rest was glass plus an LCD with a uC
    underneath. Nice design but I returned it. If calibrated regularly they
    are great but for some applications they are more a 'technology looking
    for a home'.

    Regards, Joerg
     
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