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oreillej2899

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Posts posted by oreillej2899

  1. I have two 24V power supply's both with connected to the same 0V common (and system ground) in addition both supply's are connected to two-stage AC line filter.  The analog sensors and analog inputs modules  have one of the two  24V power supply and other powers the Unistream HMI and discrete IO.

    I checked the power supply's and are with in a (+) 0.4Vdc of the 24Vdc.

  2. During calibration of a pressure sensor (4-20ma) I was unable to achieve an precise calibration 0 to 30.00 PSIA within 0.7 PSIA at the lower or upper range when using the scaling functions.

    The sensor was calibrated from the manufacture within 0.1% accuracy.

    I decided to check the Analog Input with a calibrated Fluke Processmeter from: 4.000 ma to 20.000ma.

    The Hardware was configured for 4-20ma input and default scaling 0 to 8191 inputs with strong filtering enabled.  Unilogic version 1.22.13

    Here are the results:

    Fluke(ma) Actual Count Expected Count Count Diff.
    4.0000 -45 0 -45
    6.0000 954 1024 -70
    8.0000 1954 2048 -94
    12.0000 3953 4096 -143
    14.0000 4957 5119 -162
    16.0000 5951 6143 -192
    18.0000 6951 7167 -216
    20.0000 7949 8191 -242

    The counts are non-linear corresponding to the 4-20ma inputs, i would expect the counts difference to be constant.

    I was not able to check all the channels, but could this be just a bad channel or are the values within the specification of the AI card?

     

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