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I would like to know it is the correct setting with AD5933

Question asked by JIMMYKOREAN on Jul 7, 2016
Latest reply on Aug 2, 2016 by Snorlax


Hello I am Jinhwan Kim from South Korea

 

I would like to know it is the correct setting with AD5933.

 

In the data sheet of AD5933, Z is from 1kohm to 10Mohm.

 

RFB={[(VDD/2-0.2)*Zmin]/Vpk+VDD/2-Vdcoffset)}*1/gain

 

So, I set up the Zmin with 1kohm. Also, i set up 3.3V in VDD, 1.98 in Vpk, and 1.48 in Vdcoffset.

 

Rcal= (Zmin+ Zmax)*1/3

 

So, i set up the Zmin with 1kohm, the Zmax with 10Mohm

 

First, I did calibration with the value of RFB is 670ohm, also the value of Z is 3300000ohm

 

After I change the Z to 2Mohm which I want to measure.

 

But, I could't get the result.

 

I want to know what is the problem

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