I'm working on a project to measure the human body impedance, I have the EVAL-AD5933EBZ board and I tried to connect it as in the datasheet but I think my connections are wrong because I get the same value I choose for R1 , So I have the following questions:
1- If my unknown impedance was between certain range, and Rcal = Zmax+Zmin/3. Where should I connect Rcal ? and Should I use itphysically or only I have to enter the value in R1 box on the software ? if R1=Rcal
2- where (R unknown) should be placed?
3- What is the use of PGA ? upon what need should we use x1 or x5? ( the datasheet mentions that x5 is going to saturate the DAC so why it's used?)
4- What is the sittings have to be changed on the software to get the correct results:
-If I have I frequency range or certain frequency how can I use them in software ?
- Is mid point means ( one point ) and multi point means ( two point ) in gain factor calculation?
5- Can I use two ECG electrodes which is (Ag/Ag Chlorides electrodes) in measuring body impedance ? If so, How the connection should be?
I attached picture
This project have to be submitted very soon, a quick reply would be helpful.