Читать книгу Handbook of Microwave Component Measurements - Joel P. Dunsmore - Страница 76

Often considered the most accurate and traceable of power measurement systems, the calorimeter consists of a thermally isolated RF load that absorbs the RF energy. This load is kept in a heat exchanger, and a thermopile is used to sense the change in temperature. Since the fundamental measurement is temperature, the traceability of these systems to fundamental SI units is good. These systems can handle large power but are slow to respond, are heavy, and are typically not used by practicing RF engineers, except in special cases.