DSY7172 series three electronic prepayment watt-hour meter is a kind of new-style meter, which adopt the newest technique of computer and electronic currency IC card for purchasing electricity media and assisted by software and hardware technique of computer automation management for getting electricity fee. its functions:electric energy measuring, load control and using electricity management, etc. its technical performance are completely conformed to national standard GB/T15283-94 and international stanard IEC61036. it is used for measurng rated frequency 50Hz or 60Hz three phase AC active energy electric power consumption.