DTSY23S three-phase keyboard prepaid electric energy meter is a kind of electric energy metering instrument with digital as the data exchange medium. The electricity meter can be switched between pre paid and post paid modes, with a variety of communication options, which can easily realize AMI/AMR integration. Its design concept focuses on humanization, modularization and global orientation. It also has high measurement accuracy, flexible settlement in kilowatt hours or credits, multi rate and excellent tamper resistance. DTSY23S instrument has been widely used in residential, commercial and industrial fields.