I am trying to understand EVAL-AD5933EBZ. Having worked through the documentation primarily the examples in CN0217; I have the following questions.
1) Why does the EVAL board only calibrate for multi-point frequency and not for mid-point frequency.
2) I could not get Example 1 to work; for R1, R2 and C3 the output was Z = 23Ω. The documentation states that the AD5933 can measure impedance ranges from 0.1kΩ - 10MΩ; thus, this is under the parameters of the system, is it possible to measure an impedance less than 100Ω?
3) The Vp-p (output excitation) has an effect on the reading, when testing R1 in example 2 - Vp-p = 0.2V; however, changing Vp-p = 2V produced an error in the Z. My question is how do we know which output excitation voltage to select.
4) If I want to measure an impedance from 5kHz - 100kHz for an unknown impedance of 100Ω - 300Ω what Vp-p would I use and would Rcal = (Zmin + Zmax) / 3 = 133Ω?
Kindly awaiting your assistance.