[en] The pulsed microwave irradiation effect on the electric and magnetic properties of the ceramics Er Ba₂ Cu₃ O_x is investigated. The real (χ') and imaginary (χ'') parts of magnetic susceptibility and the resistance are measured as a function of temperature. It is shown that irradiation of ceramics by small doses (40-60 pulses) shifts T_c to higher temperatures (from 92,0 to 93,5 K). The dose increase leads to less significant T_c rise or even reduces T_c as compared to the unirradiated material. The holding of the irradiated ceramics at room temperature for 6 months induces an additional T_c shift up to about the same value 93,7-94,0 K for all the samples. The subsequent annealing at 450 ^deg C leads to an opposite T_c shift down to the temperatures lower than T_c for the initial (unirradiated) material