How WaveForms Impedance Analyzer works (also with Impedance Analyzer Adapter)

[Aero]

Hi,

Currently I want to measure the impedance of a fabricated material by treating this material as the load of the circuit. I have several question about the WaveForms Impedance Analyzer:

1. Based from my understanding from reading the provided guide on the website (https://digilent.com/reference/test-and-measurement/guides/waveforms-impedance-analyzer), the adapter use the similar topology with the "load first" topology. I suspect this topology is the same as the W1-C1-DUT-C2-R-GND topology. Am I correct here?
2. I have some difficulties to understand how Impedance Analyzer works. In that topology, there are two (positive) probes for the first and the second scope channel, marked with "Scope 1" and "Scope 2", respectively. Is the purpose of those probes are for measuring the voltage between those corresponding node and ground, then calculate the impedance based on the acquired measurement from those probes? Can someone explain this in details (with the general principle of physics/math behind this measurement process)?
3. What is the difference between Amplitude mode and CV resistor mode? Is my understanding correct when I say that in Amplitude mode, the device keep the same amplitude (vpp?) of the input voltage generated by the Wavegen; and for CV resistor mode, the device try to keep the same voltage (vrms) on the DUT?
4. What is the exact meaning behind the "resistor too high/low" message? I guess it is related to the accuracy of the measurement result. Can someone explain it to me and relate it with how this Impedance Analyzer works?

Thanks!

[attila]

Hi @Aero

1. Yes
2. It uses ac signal attenuation and phase. https://en.wikipedia.org/wiki/Electrical_impedance
3. Yes.
4. 

[Aero]

17 hours ago, attila said:

Hi @Aero

1. Yes
2. It uses ac signal attenuation and phase. https://en.wikipedia.org/wiki/Electrical_impedance
3. Yes.
4. 

Thank you for the quick response, @attila! Now I have more understanding about this device.