FIELD: precision measurement. SUBSTANCE: noise signal is applied to input of any amplifier measured from the set from reference noise source; noise temperature T is lower or higher than environment temperature To. Reference noise source is used for measurement of noise temperature of set of amplifiers. Relation of M levels of power of noise signal is measured at output of the amplifier at frequency of measurement of noise temperature of set of amplifiers. Then noise signal with noise temperature To is applied to input of amplifier and relation Mo of levels of power of noise signal with noise temperature To is applied to input of the amplifier. Attenuation α introduced of the path to be measured is determined from the relation given in the description of the invention. EFFECT: simplified method due to reduction of necessary connections and disconnections. 1 dwg
