I am using AD5933 to measure complex impedance of human skin at a constant frequency, under different conditions. In order to evaluate and compare measurements, I have purchased an EVAL-AD5933EBX rev.B. I have several questions, and these two are serious:
1. How could I get an exact schematic with part numbers for the circuit board I have? None of the documents I have downloaded or received with a CD have the correct component info. Page6 of Rev.PrC EvalAD5933EB tech note has the best fidelity, still lacks some parts.
2. Following many discussion threads on this forum, I have downloaded the analysis program ver1.3 (though it reads Beta version 1.0 on the window header). Anyway, I can not read resistors accurately. Say,
Start Frequency 10kHz,
Range 1Vpp or 2Vpp
Calibrated with a 100k resistor
When I run sweep for an unknown resistor, 220k for example, it reads 102k.
Multi-Point Frequency Calibration resulted AVG=2.202420251e-9
Would anyone advise?
Teknofil & MakeLab