DETERMINATION OF THE VOLT WITH THE IMPROVED PTB VOLTAGE BALANCE

Determinations of the Josephson frequency-to-voltage quotient K(J) were carried out at the PTB, using a voltage balance after significant improvements had been made to the measuring system. The value of K(J) was found to be consistent with the conventional value, K(J)-90, within 3 x 10(-8). The total relative uncertainty (1-sigma) of the experiment is estimated to be 2.74 x 10(-7) with a type-A uncertainty of 0.64 x 10(-7) and a type-B uncertainty of 2.66 x 10(-7).