The force measurement system unavoidably introduces noise in the output signals. The noise in the center of pressure (COP) signal is the propagation noise arise from the combination of the components used to compute it. A framework to analyze the random error in COP signals was introduced based on the “Guide to the Expression of Uncertainty of Measurement” (GUM) approach. Furthermore, the spatiotemporal resolution criterion was used as a parameter to evaluate force measurements systems under specific experimental conditions.