Direct comparison between Inmetro Programmable and conventional Josephson Voltage Standards at 10 V

A 10 V Programmable Josephson Voltage Standard (PJVS) is being implemented at Inmetro, in collaboration with the National Institute of Standards and Technology (NIST). Inmetro Programmable and conventional Josephson Voltage standards have been compared at 10 V, in order to evaluate the new PJVS system. The uncertainty components are addressed and the final comparison result is (V
_PJVS
-V
_cJVS
)/V
_cJVS
= 1.24 × 10
^-10
with a relative total combined standard uncertainty of 2.79 × 10
^-10
.