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  1. Why does the impedance analyzer only allow 10Ω, 100Ω, 1kΩ, 10kΩ, 100kΩ, and 1MΩ reference resistors? I might have a precision 510Ω resistor that I want to use for a reference. Or, as happened for me today, I might want to use a 1Ω resistor as a reference (I was trying to determine the saturation current for an inductor, so I needed a large DC current, plus a small signal to measure impedance with.) I added an external transistor to provide gain from the function generator, but the 10Ω constraint meant that I couldn't raise the current much without hitting voltage limits. (I'll have to use the network analyzer and do my own fitting, rather defeating the advantage of the impedance analyzer) I found the impedance analyzer a bit non-intuitive to use and almost completely undocumented. It is a bit annoying that compensation needs to be redone any time the sweep is changed, and there there is no way to store a number of different compensation sets, switching between them as needed. I was also wondering why the impedance analyzer used a shared ground, rather than taking advantage of having differential inputs to measure the voltage across the resistor and the unknown impedance separately. Using the differential channels, one can have a larger difference in |Z| between the reference and the unknown, since you don't have to compare R with R+Z, but only with Z.