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Question about set freq. of AD5933

Question asked by InhoJeon on Apr 17, 2015
Latest reply on Aug 1, 2016 by Snorlax

Hi all,


I'd like to measuring human skin conductance(so called GSR) using AD5933.

I designed circuits refer to EV B'd  with AD5933 about ADI application note. 

And measuring impedance using that circuit B'd ; It is sweeping Freq.

I think that is measuring body fat ; sweep freq means ananasys body fluid by body depth.

I want to just outside skin(like whrist) impedance.

So, Not need to sweep Freq, Just fixed freq. 

And, what Freq. is measuring outside skin (like whrist) impedance?



2nd, I checked my skin resistor with Multimeter. that range about 50M~20Mohm.(Dry ~ Wet condition).

What value of Cal Resister(refer to ADI EV B'd Circuit)

Plz, Reply for my questions. ASAP.

Best Regards,

Inho Jeon