The spectrometer of coincidence of photoions with threshold photoelectrons was described with ionizaton of monochromatized (△λ≈85÷165 nm). The monopole mass-spectrometer and steradian electron energy analyzer were studied. The multichannel pulse analyzer served for recording time-of-light coincidence curves. The accumulated in the analyzer time-of-flight coincidence curves required further processing with the aid of a computer (DVK-1). The data from analyzer entered though the interface module to the CAMAC system line. Thus, the possibility to produce threshold electron spectra and photoionization efficiency curves for various ions under automatic conditions took place.