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How to perform 200kHz-5MHz sweep while maintaining 200mArms?

Discussion in 'Electronic Basics' started by Michael, Sep 22, 2004.

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  1. Michael

    Michael Guest

    I am performing a test to measure the impedance through electrode pads
    placed on opposite parts of the human body. The protocol requires that
    the measurement be made by maintaining an AC sine current of 200mArms,
    sweeping the frequencies from 200kHz to 5MHz, and measuring the Vrms
    between one electrode and a reference point on the body. The impedance
    is to be calculated by dividing this voltage by the known 200mArms
    current.

    How do I sweep frequencies while maintaining a constant 200mArms
    current using a HP 33120A (waveform generator w/ 0-15MHz freq and
    0-10V peak to peak) or a HP 4192A (impedance analyzer w/ 0-15MHz freq
    and -1V-+1V peak to peak)? Can I construct a circuit external to one
    of these units and accomplish the 200mArms sweep? If not, what
    lowest-cost set-up could?
     
  2. Chris Holmes

    Chris Holmes Guest

    Hm, won't you need a high voltage to force that much current through the
    body? I thought just a few mA could be lethal...
     
  3. John Fields

    John Fields Guest

     
  4. Tim Auton

    Tim Auton Guest

    If you want to stop someone's heart it's much easier to stab or shoot
    them.


    Tim
     
  5. Chris Holmes

    Chris Holmes Guest

    Maybe this circuit is for a cadaver lab. ;-)
     
  6. Tim Auton

    Tim Auton Guest

    In the Burke and Hare sense? :)


    Tim
     
  7. Home electroshock therapy?
     
  8. Yes, but the cleanup is much easier without the extra holes in the body.
    gg
     
  9. Fred Bartoli

    Fred Bartoli Guest

    It's better to try the setup on you first. At least you'll kill only one
    person.
     
  10. Fred Bartoli

    Fred Bartoli Guest

    Na, it should be 200 fA, but not 200 fucking Amperes...
     
  11. Jamie

    Jamie Guest

    Hmm
    last time i knew that much current passing through the body could cause
    some fatel damage.
    are you sure it isn't 200 Na ?
     
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