I am using the AD5933 Eval Board to measure a charateristic phase shift of an impedance sensor. Between 5 and 100 kHz I get decent values with MCLK setting to 16 MHz.. For measuring at lower frequencies (1-5 kHz) I set MCLK to 2 MHz but now my values got implausible.
At 2 MHz MCLK and lower frequencies i get a new phase mimium at -7°altough the values should extend the curve measured at higher frequencies.
I am following the procedure for "measuring the phase across an impedance" and "measuring at lower frequencies" from the user guide.
I'm only using the internal oscillator.
Is it possible that the measured phase angle depends on clock frequency? It should not right?
Thanks for helping me,