  The noise signal of the voltage fluctuations of cathode arcs recorded at
different sampling frequencies was analyzed. To explain obtained Fourier
spectra for each measurement, a model was developed. The characteristics of the
model were obtained by comparing Fourier spectra of the developed model and
experimental signals. The model shows good quality agreement with the
experiment. The voltage signal consists of two parts: a sum of very short
(several ns) fluctuations, related a microexplosion or ecton and a low
frequency part related to a random cathode spot walk.
