DDSD7172 series single phase electronic multifunctional watt-hour meter is a kind of electric energy measuring meter which adopt a large scale of integrated circuits and use number sampling disposal technique and SMT craftwork, and designed and manufactured with nineties international advanced lever as per industrial user factual electric power consumption status. The meter can accurately measure single phase positive direction and reversed direction active energy and reactive energy electric energy, active energy and reactive energy power, voltage and current and frequency parameters etc. It can do data processing as per relevant tariff and demand. The meter can set four kinds of tariffs, four time zones and ten daily period of times.