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

Question

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?

John Fields · Accepted Answer

---You're joking, right?-- John Fields

Chris Holmes · Answer

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...

Chris Holmes · Answer

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

Glenn Gundlach · Answer

Yes, but the cleanup is much easier without the extra holes in the body.gg

Tim Auton · Answer

If you want to stop someone's heart it's much easier to stab or shootthem.Tim-- Guns Don?t Kill People, Rappers Do.

Tim Auton · Answer

In the Burke and Hare sense? :)Tim-- Guns Don?t Kill People, Rappers Do.

Robert Monsen · Answer

Home electroshock therapy?

Fred Bartoli · Answer

"Michael"  a écrit dans le message denews:It's better to try the setup on you first. At least you'll kill only oneperson.-- Thanks,Fred.

Jamie · Answer

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

Fred Bartoli · Answer

"Jamie"  a écrit dans lemessage de news:Na, it should be 200 fA, but not 200 fucking Amperes...-- Thanks,Fred.

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

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