应用计算机管理，先购电后用电；在额定电流范围内能限制最大使用功率(由供电部门限定)；一表一卡，专卡专用，失卡不失电，补卡再用；电卡能双向传递数据；能自动断电告**户购电；电量为零时，自动拉闸断电；并具有一定的防窃电软件设计等。适用于频率为50Hz或60Hz有功电能计量，安装于室内或室外表箱内使用。适用于环境温度为一10℃～+50℃，相对温度不超过85％，且周围空气中不应有腐蚀性气体，避免尘砂、盐雾、凝露等影响。

Adopt the mode of computer control，first purchasing electricity，then using it；it can limit max service power(Specified by electric power department)in the rated current range；one meter with one card，special ca rd for special application，no lose electricity if Iosingcard，reuse electricity the rough renewing the card；the electric card can transmit the data；when the electricity quantity is zero，it can switch off the power automatically to warn users shall pu rchase the electricity；besides，it has certain software design of anti—thieving electricity．Applicable for measuring 50 Hz or 60Hz active energy,it is installed inside or in the box outside．It is used in the best place that the environment temperature is 10℃’+50℃and relative humidity is not beyond 85％．the ambient air can’t contain the corrosive gas，dust，salt fog，condensation，etc．．