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The Simons Observatory (SO) will perform ground-based observations of thecosmic microwave background (CMB) with several small and large aperturetelescopes, each outfitted with thousands to tens of thousands ofsuperconducting aluminum manganese (AlMn) transition-edge sensor bolometers(TESs). In-situ characterization of TES responsivities and effective timeconstants will be required multiple times each observing-day for calibratingtime-streams during CMB map-making. Effective time constants are typicallyestimated in the field by briefly applying small amplitude square-waves on topof the TES DC biases, and fitting exponential decays in the bolometer response.These so-called "bias step" measurements can be rapidly implemented acrossentire arrays and therefore are attractive because they take up littleobserving time. However, individual detector complex impedance measurements,while too slow to implement during observations, can provide a fuller pictureof the TES model and a better understanding of its temporal response. Here, wepresent the results of dark TES characterization of many prototype SObolometers and compare the effective thermal time constants measured via biassteps to those derived from complex impedance data.

Comparing complex impedance and bias step measurements of Simons Observatory transition edge sensors