[en] An automated bench for measuring the main characteristics of the FEhU-115 M photomultipliers used in the electromagnetic calorimeter of the PHENIX facility is described. Techniques for measurements of the linearity range of the output pulse anode current, amplification coefficient of a photomultiplier, the photocathode sensitivity nonuniformity and its quantum efficiency are considered. The following values of the FEhU-115 M main characteristics are obtained: the mean quantum efficiency is 13,6%, the minimum limit of the output signal linearity is 40 m A and the mean nonuniformity of the photocathode sensitivity is 3.4%