Direct comparisons of ac resistance standards of various technology designs

In this paper, we present results of direct AC resistance comparisons carried out at LNE with a four terminal-pair coaxial impedance bridge in 1:1 and 10:1 ratios at frequencies up to 1.6 kHz. Various ac calculable resistance standards have been used, having 1 kOmega and 10 kOmega nominal values and different technology designs. LNE standards were a coaxial straight wire resistor of Haddad type and two thin film coaxial resistors, while MIKES standards were two folded wire bifilar resistors. The whole changes in frequency of the resistance ratios are within some parts in 10
⁸
.