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I do not understand the algorithm being used for reporting "resistor too high!?" in the impedance analyzer. It seems to pop up whenever the phase is close to 0°, which makes no sense to me. The resistor is too large when the magnitude of impedance measured is less than about 0.01 times the reference resistance—the phase isn't really a relevant parameter. A slightly more sophisticated algorithm might look at the voltages of the two measurements and report the resistance being too large or too small when the relevant voltage (across the resistor or across the DUT) gets down to only a few bits in the ADC. Speaking of voltages—shouldn't the impedance analyzer warn the user when too much current is being asked of the function generator? With a 10Ω reference resistor, the short compensation calls for 100mA/V, but the output stage of the function generator is limited to about ±35mA so even the default ±1V is too much amplitude. Detecting that the voltage measured does not match the voltage requested should not be very difficult.