Abstract
The paper describes the latest analysis made on a 3.5 mm coaxial microcalorimeter, which is the system used by Istituto Nazionale di Ricerca Metrologica to set up the electromagnetic power standard in the frequency band between 1 MHz and 26.5 GHz. The analysis concerns mainly the electro-thermal behavior of the system feeding lines whose performances define the main error component of the microcalorimeter. Previous mathematical models of the system have been updated and the effects on measurement accuracy are shown by comparing new and old measurement datasets at frequency values between 50 MHz and 26 GHz. It results in the fact that the influence of the sensor mismatch on the microcalorimeter calibration factor can be as high as 0.1% and reflects on the effective efficiency value.
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