AD5933 for bioimpedance

Discussion in 'The Projects Forum' started by sash8393, Jan 28, 2015.

  1. sash8393

    Thread Starter New Member

    Jan 28, 2015
    2
    0
    hi.
    I am using AD5933 EBZ eval board for bioimpedance acquisition (from wrist). the impedance value reads 650 750 kohm range. i used 100 k resistor for calibration. Is it correct? what value of calibration resistor should i use? what will be the actual range of wrist bioimpedance?

    Thanks in advance.
     
  2. sash8393

    Thread Starter New Member

    Jan 28, 2015
    2
    0
    For frequency range 45kHz to 50 kHz , i am getting 650 to 750 k ohm impedance. is it correct? But in some books i read that the normal value should be in the range of 400 to 700 ohm. Can anybody explain this to me?

    Thanks in advance for helping me.
     
  3. Col

    Member

    Apr 19, 2012
    44
    2
    Hi,
    A lot more information is needed to make a judgement, what is your circuit? What frequency? What are your electrodes and how well are they interfaced to the skin? This is the biggest factor in bio impedance measurement and likely the reason your measured impedance is so high!

    Check out this paper for details on using the AD5933 for bioZ http://iopscience.iop.org/1742-6596/407/1/012019/pdf/1742-6596_407_1_012019.pdf
    C
     
    Last edited: May 15, 2015
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