hi.i have same problem with that i got the impedance very well and accurate .but when i want to measure the capacitance for example 1uf i got wrong phase about -57 degree. when i i calibrate the board with rcal=100 ohm i got real of -329 and im -9386 so the phase of system is about-92 degree when i put 1uf capacitor i got real=-4389 im=-2649 and the phase is -148 so the phase of my measurement is -57 degree the frequency i use is 1khz.
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