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AD5933, Measuring imaginary when using only resistance

Question asked by slund89 on Nov 7, 2012
Latest reply on Nov 8, 2012 by slund89

Hi again

 

I'm having trouble with the AD5933. I'm interfacing the controller perfectly, but...

 

When i'm reading all the values from the sweep, i get a imaginary value for every frequency even though i should only get real values, when i'm measuring a 4k resistor (only real).

 

Here is some of the values.

Real and Imag.PNG

Please notice that the impedance of fx ((2004^2)+(-3485^2))^0.5 = 4.02 kOhm, very close to the resistor value. But for my application i do need both the imag and real values, not the impedance.

Any idea what i do wrong?

 

Kindest regards Simon

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