unstable readings on GUI for Data Acquisition project

Discussion in 'The Projects Forum' started by afiqaris, Apr 10, 2013.

  1. afiqaris

    Thread Starter New Member

    Mar 17, 2013
    18
    0
    As attached, attempting to obtain analog signals for data acquisition and control system project.

    the figure is the schematic design of the proposed transducer circuit.

    findings are that the signals varies on the GUI.

    assumption is the grounding design is wrong,yet unable to start a process of trial and elimination.and most like unwanted noise signals overlooked in initial design.

    please give guidance and feedback on probable cause of varying analog signals and measures to overcome such findings.

    kindly, please look at the schematics and any inputs and suggestions are very much appreciated.

    tq.
     
  2. #12

    Expert

    Nov 30, 2010
    16,310
    6,816
    Suggestions: Increase C2 and get your 3 volt supply off the 12 volt system, not the 230 volt system.

    A schematic tells nothing about wire routing and proper grounding. Nothing can be said about that from what you have presented.
     
  3. afiqaris

    Thread Starter New Member

    Mar 17, 2013
    18
    0
    tq,

    here attached, could the PCB sketch indicate the grounding problems/errors in your point of view?

    single common ground output channel is at port 4 below.(from left)

    appreciate the help.
     
  4. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,771
    971
    needle in a haystack...

    you didn't even define "signal varies"...
     
Loading...