https://doi.org/10.1051/epjap:2008116
On coaxial microcalorimeter calibration
1
Istituto Nazionale di Ricerca Metrologica – Strada delle Cacce 91,
10135 Torino, Italy
2
Politecnico di Torino – Corso Duca degli Abruzzi 24, 10129 Torino,
Italy
Corresponding author: l.oberto@inrim.it
Received:
20
February
2008
Accepted:
21
May
2008
Published online:
10
July
2008
Primary power standards in the microwave domain are realized using a calorimetric technique, usually identified with the used measurement system, i.e., the microcalorimeter. It is adjusted for measurement of power ratios with a relative accuracy that, after an appropriate system calibration, is of order of 10−3, at least in the microwave domain (1 GHz–18 GHz). Hereby we describe the calibration process implemented at the Istituto Nazionale di Ricerca Metrologica (Italy) for realizing a coaxial power standard based on indirect heating thermocouples. Particular regard is devoted to describe the nearly ideal thermal load used for determining the microcalorimeter losses and their influence on the measurand accuracy.
PACS: 06.20.F- – Units and standards / 06.30.Ka – Basic electromagnetic quantities / 07.57.-c – Infrared, submillimeter wave, microwave and radiowave instruments and equipment
© EDP Sciences, 2008
