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

Hi,

May I know the value of the impedance you are trying to measure? Just to check if it is in the range of the impedance that can be measured by the system with the Rfb and Rcal you are using. Can you also share your schematic?

Best regards,

Mark