The True-Twin microcalorimeter: a proof-of-concept experiment

We present a proof-of-concept experiment to realize microwave primary power standard with a true-twin microcalorimeter. Double feeding line microcalorimeters are widely used by National Metrology Institutes. A drawback concerns the system calibration: traditional processes changes measurement conditions between system characterization and the measurement stage. Nevertheless, if the feeding lines are made twin, a measurement scheme that avoids separate characterization can be applied, equations simplify and time consumption is halved. Here we demonstrates the feasibility of the idea. The result of an effective efficiency spectroscopy of a thermoelectric power sensor is compared with figures obtained with well established methods.Comment: 11 pages, 2 figures, 1 tabl

Two different ways in evaluating the uncertainty of S-parameter measurements

The expression of uncertainty of scattering parameter measurements in vector network analysis is an active research subject, since no full consensus about proper algorithms for such expression has been reached so far. Recently, two software packages have been acquired at INRIM, which allow to perform this task in a metrological framework. In this paper we compare the result of analysis performed by two packages, VNA Tools II and Multiport Measurement Software version 4 (MMS4). Both packages claim to perform uncertainty analyses fully compliant to the Guide of expression of uncertainty in measurement, but following completely different approaches. We organized a comparison by performing, with both packages, analyses of the very same datasets. These have been generated by real measurements on passive standards with a commercial vector network analyzer. Results of the comparison give consistency of the uncertainty analyses performed by the software packages, which can be therefore considered equivalent and mutually validated

One port measurement procedure for two ports devices with different port connectors

INRiM Technical Report n.8

Design, realization and characterization of a new Tee for AC-DC Transfer Difference measurements

INRiM Technical Report n.8

Design and realization of a Calorimetric Thermal Voltage Converter for frequencies up to 1 GHz

INRiM Technical Report n.5

Design and realization of a Calorimetric Thermal Voltage Converter for frequencies up to 1 GHz

INRiM Technical Report n.5

The frequency dependence of a 10 nF gas-dielectric capacitor

A direct realization of the farad from the quantum Hall effect involve the comparison of the Hall resistance with a capacitor, using a dedicated impedance bridge. Best measurement uncertainty is achieved for frequencies not corresponding to the traditional ones employed in dissemination (1 kHz, or 10 krad s-1). Hence, standards having a known frequency dependence are necessary to perform a correction. Here we investigate, with network analysis techniques, the frequency dependence of a new commercial 10 nF gas-dielectric capacitance standard