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

[Michael]

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?

 

[Chris Holmes]

Michael wrote:

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?

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...

 

[John Fields]

On 22 Sep 2004 14:41:17 -0700, maxel@berkeley.edu (Michael) wrote:

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?

---
You're joking, right?

--
John Fields

 

[Tim Auton]

maxel@berkeley.edu (Michael) wrote:

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.

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


Tim
--
Guns Don’t Kill People, Rappers Do.

 

[Chris Holmes]

Tim Auton wrote:

maxel@berkeley.edu (Michael) wrote:


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.


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


Tim

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

 

[Tim Auton]

Chris Holmes <seymour_bunzzERASE@hotmail.com> wrote:

Tim Auton wrote:
maxel@berkeley.edu (Michael) wrote:

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 [...]

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

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

In the Burke and Hare sense?


Tim
--
Guns Don’t Kill People, Rappers Do.

 

[Robert Monsen]

Michael wrote:

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?

Home electroshock therapy?

 

[Glenn Gundlach]

Tim Auton <tim.auton@uton.groupSexWithoutTheY> wrote in message news:<nvv3l0lipcpmi15j2gfjom9l52ehlqurop@4ax.com>...

maxel@berkeley.edu (Michael) wrote:

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.

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


Tim

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

 

[Fred Bartoli]

"Michael" <maxel@berkeley.edu> a écrit dans le message de
news:ce5951b4.0409221341.7f9b7bcc@posting.google.com...

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?

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


--
Thanks,
Fred.

 

[Fred Bartoli]

"Jamie" <jamie_5_not_valid_after_5_Please@charter.net> a écrit dans le
message de news:10l5t6ri3ui6d7a@corp.supernews.com...

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 ?

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


--
Thanks,
Fred.

 

[Jamie]

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 ?


Michael wrote:

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?