Comparaisons d'étalons de tension à effet Josephson

摘要

The development of voltage standards based on Josephson junction arrays, directely providing voltages of I V and 10 V lead the BNM-LCIE to take part in several intra or interlaboratory comparisons. The values obtained during direct or indirect comparisons have shown a good agreement between the observed differences and the calibration uncertainty calculated values. In particular, a relative difference of 5.10-Il (1σ↓(A+B)= 6,5.10↑(-11)) has been observed during the direct comparison of the I V voltages delivered by two Josephsonjunction arrays.