Through to the manufacturing enterprise production license three-phase watt-hour meter on-site examination prerequisite, lists the conditions essential to manufacturing enterprises, mainly the hardware aspect, solve the measurement products manufacturing license/assessment on manufacturing enterprise field three-phase watt-hour meter scale inconsistency problem. In the design of smart meters, which problem you want to solve the electromagnetic compatibility EMC. This article for the EMC test solutions to the issues raised advocates reasonable redundancy design proposes a gradual increase or decrease in the reliability test.