  When subject to an external time periodic perturbation of frequency $f$, a
Josephson-coupled two-state Bose-Einstein condensate responds with a constant
chemical potential difference $\Delta\mu=khf$, where $h$ is Planck's constant
and $k$ is an integer. We propose an experimental procedure to produce
ac-driven atomic Josephson devices that may be used to define a standard of
chemical potential. We investigate how to circumvent some of the specific
problems derived from the present lack of advanced atom circuit technology. We
include the effect of dissipation due to quasiparticles, which is essential to
help the system relax towards the exact Shapiro resonance, and set limits to
the range of values which the various physical quantities must have in order to
achieve a stable and accurate chemical potential difference between the
macroscopic condensates.
