An RF gun with a plasma ferroelectric cathode can generate intense electron beams with peak current in a bunchud up to 10² A. The space charge forces of the beam increase errors of the beam emittance measurement using aud ‘quadrupole’ technique. The errors of the measurements and the implementation of the ‘pepper-pot’ technique areud referred in the paper. Studied is the beam emittance generated by a single-cell S-band RF gun with the plasmaud ferroelectric cathode. The beam pulse current is 6 A (current in a bunch is 60 A) with pulse duration 40…90 ns andud particle energy ≅ 500 keV.
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