Impedance measurements provide a useful probe of the physics of bolometers and
calorimeters. We describe a method for measuring the complex impedance of these devices.
In previous work, stray impedances and readout electronics of the measurement apparatus
have resulted in artifacts in the impedance data. The technique allows experimenters to find
an independent Thevenin or Norton equivalent circuit for each frequency. This method
allows experimenters to easily isolate the device impedance from the effects of parasitic …