  The characteristics of the secondary electrons` calibration
quasi-monochromatic beam of the accelerator S-25R "Pakhra" of the Lebedev
Physical Institute of the Russian Academy of Sciences (LPI) on the basis of
magnet SP-57 are presented. With an electron energy in the range of 45-280 MeV,
a collimator diameter in front of the trigger counters of 3 mm and copper
Converter thicknesses of 1-3 mm, the energy resolution and beam intensity were
4.4-2.2% and around 16 e/sec, respectively.
