  In this paper we determine the magnetic field dependence of the critical
current of a tridimensional disordered Josephson junction array (3D-DJJA). A
contactless configuration, employing measurements of the AC-susceptibility, is
used to evaluate the average critical current of an array of YBa2Cu3O7-x. The
critical field necessary to switch off supercurrents through the weak links at
the working temperature is also obtained.
