A procedure for tuning of optical channels and testing of laser radar systems has been described based on comparison between real echo signals and signals calculated from the special computer code CF1 intended for engineering calculations of special-purpose lidars. Results of tuning of optical channels and testing of an infrared (IR) differential absorption and scattering (DAS) laser radar produced by the Institute of Atmospheric Optics of SB RAS (Tomsk) to order of the Korean Institute of High Technology, are presented.