The necessity of upgrading the optical path of the atomic frequency standard based on rubidium-87 atoms is substantiated. A new scheme for automatic gain control in the optical path of an atomic frequency standard based on rubidium-87 atoms is presented. The amplifier of the error signal formed on the photodetector for controlling the microwave signal is considered in detail. Experimental studies of the metrological characteristics of an atomic frequency standard based on rubidium-87 atoms with automatic gain control are presented. The validity of the developed automatic amplification scheme for the new frequency standard based on rubidium-87 atoms is confirmed.