Abstract: Disclosed is a radio frequency (RF) calorimeter having National Metrology Institute (NMI) traceable measurement accuracy with uncertainty of less than about ±0.25%, including the incorporation of a low-frequency reference source integral to the calorimeter for the purpose of self-calibration, a load with very high thermal efficiency, a temperature-controlled load enclosure, a vacuum relay high-power RF switch, an integrated low-frequency reference source, a non-reactive coolant liquid, a liquid-to-liquid heat exchanger, a self-calibration routine that can be performed on demand, and machine learning algorithms to create more accurate data models.

Abstract: Disclosed is a radio frequency (RF) calorimeter having National Metrology Institute (NMI) traceable measurement accuracy with uncertainty of less than about +0.25%, including the incorporation of a low-frequency reference source integral to the calorimeter for the purpose of self-calibration, a load with very high thermal efficiency, a temperature-controlled load enclosure, a vacuum relay high-power RF switch, an integrated low-frequency reference source, a non-reactive coolant liquid, a liquid-to-liquid heat exchanger, a self-calibration routine that can be performed on demand, and machine learning algorithms to create more accurate data models.