Fig. 1: Testing system setup.

Simulated parameters, selected based on real-world NICU data, were sent to the pulse oximetry system under test (pulse oximeter + connected finger sensor) via the Simulator and the SpO2 Functional Tester. A shielding enclosure ensured all testing equipment was protected from ambient light, which may cause signal artifacts. All parameters measured by the pulse oximetry system under test were then transferred to the data acquisition computer and stored for analysis.