[en] In the Nuclear Research Laboratory of the Mongolian State University we have been using the American Perkin Elmer corporation's equipment which is called ''The Atomic Absorption Spectro-Photometer'' (AAS) since 1981. Our task was to connect Perkin Elmer equipment to an IBM/PC compatible computer and to automate the manual operations. We describe a new design of the instruments which allows us to connect the Perkin Elmer equipment ot the IBM PC/XT type computer and consequently to automate its manual operations that are necessary during the measurements of each sample on it. A timing diagram of date signals which should appear on the AAS display and the general principle to operate of the instrument have been reviewed. Finally authors draw your attention to the opto-isolator which is necessary to protect the Perkin Elmer equipment, the IBM/PC/XT computer and the new equipment in case of any accident. In other words the new equipment is connected by the optical isolator link to the computer. 3 figs