The microwave response of a parallel plate dielectric resonator, made
of bulk single crystal SrTiO3 coated with thin YBa2Cu3O7-x film, is in
vestigated when a pulse voltage is applied. Pulses of similar to 1kV a
mplitude, and 1ms leading and 3 mu s trailing fronts, were used. No re
laxation process in the material of the disk resonator has been observ
ed.