Key comparison EURAMET.T-K1: Realisations of the ITS-90, 2.4 K to 24.5561 K, using rhodium-iron resistance thermometers

Project Description

The measurement protocol for this regional Key Comparison is essentially the same as that used for CCT-K1, with the substitution of PTB as the pilot laboratory. With the scope to get direct linking with the CCT-K1 comparison, the calibrations of two RIRTs of INRiM (serial numbers 232324 and B190) and INTiBS (serial numbers 93 and B178) will be compared at PTB with the calibrations of the RIRTs of NMi VSL (serial number 226246), NPL (serial numbers 221481 and 221 485), and PTB (serial numbers 229074 and 229075) that participated in CCT-K1.

Measurements will be performed at a set of comparison temperatures similar in distribution to the original 31 CCT-K1 comparison temperatures in the range from about 2.4 K to 24.5561 K. The results will be recorded at the comparison temperatures as determined by the PTB reference RIRTs. These results will remain blind until after the measurements are completed.

Final Report 2015-02-11

The comparison has been completed and results are published in the KCDB.