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shielding for current stability?

Discussion in 'Electronic Basics' started by Fritz Oppliger, Jan 30, 2004.

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  1. I am using AD592AN temp sensors. Connected via split up ribbon cable type
    wire , +12V on the high side, voltage divider on the low side> 120K/22.1K
    / AGND, resulting 2.something volts fed past clamping diodes into 4051
    MUX, to 16bit ADC CS5501 .

    I run 8 sensors in parallel, the wires are about 2 feet long.
    To calibrate I put all sensors in a bundle and set their output as equal
    to a precision mercury thermometer.

    Then I move them apart to measure temp in various places. If I put the
    mercury alongside any one of them there now appear discrepancies up to
    0.6F .

    When I re-calibrate as per above they again agree with the mercury.

    The environment is inside an incubator box, with (hopefully grounded)
    metal mesh cradles and fans stirring the air .

    Question: is there a possible influence of the air flow or charge
    potential in the cradles upon the device itself or the wire? Would using
    shielded wire make sense?
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