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AD5933 measurement problem

Question asked by prashanth443 on Jun 25, 2015
Latest reply on Sep 1, 2015 by mcee

Hii sir,

         Please can u help for solving the AD5933 data measurements. I have tested AD5933 got values for real and imaginary data but constantly varying the data when continously  when i on and off the board. I cant justify weather the data is correct or not.

1. By using RFB 150k ohms and Rcal 150K ohms calculated the gain factor.

2. next placed the unknown resistor it always shows the impedance value nearly equal to 150k ohms or some it is showing the unexpected values.

3. vp-p= 1.98v

    gain = x1

     internal clock

     vdd=3.3v

4. By using the schematic given in datasheet i have designed 

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