In this method, the Seebeck coefficient is measured relative to alumel. To calculate the absolute Seebeck coefficient, platinum is measured relative to the alumel wire across the temperature range.
Data for the absolute Seebeck coefficient can be found in the literature: Cusack, Kendall, “The Absolute Scale of Thermoelectric Power at High Temperature,” Proceedings of the Physical Society 72 (5): 898. (1958)
