Resistance multiplexing in strain gauge

Discussion in 'The Projects Forum' started by shia_s, Aug 5, 2011.

  1. shia_s

    Thread Starter New Member

    Jul 7, 2011
    2
    0
    hi,
    I have 12 strain gauges but only have one bridge box and one signal conditioning. I need to read the voltage ouput from the gauges with frequency 3,6 kHz. (so I think each gauge should be read with 300 hz frequency). I think to use some IC such as 4066 or 4051 to multiplex the output from strain gauge, but I read that the output from strain gauge is resistance, and those kinds of ic's is switching the voltage not resistance.my friend suggest me to use mechanical relay but I know it can't use for 300 hz sampling. Do you have any other idea to multiplex these gauges? Thanks.
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    You won't be able to multiplex them. You will have a hard enough time trying to keep them from drifting and keeping electrical noise out as it is, with each gauge having its' own bridge and signal conditioner.
     
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