The document describes a nanowire thermocouple characterization platform. The platform contains a palladium-gold nanowire thermocouple, a resistive palladium heater, and two resistive palladium thermometers located on a silicon dioxide layer. It was designed to accurately measure the temperature difference between the thermocouple's hot and cold junctions when calibrating nanowire thermocouples. The platform was used to determine the relative Seebeck coefficient of a palladium-gold nanowire thermocouple, measured to be 2.963 ± 0.004 μV/K at 294 K. Nanowire thermocouples provide benefits like high spatial resolution, fast response time,