DDS-221L板前式安装单相电子式有功电能表系我公司采用微电子技术与专用大规模集成电路，应用数字采样处理技术及SMT工艺等先进技术研制开发的单相两线有功电能表。该表技术性能完全符合IEC62052-11和IEC62053-21国际标准中1级单相有功电能表的相关技术要求，能直接精确地测量额定频率为50Hz或60Hz单相交流电网中负荷的有功电能的消耗，供安装于室内或室外表箱中使用。该表由步进电机式脉冲计数器显示有功用电量，具有可靠性好、重量轻、外形美观、安装方便等特点。
DDS-221L series front panel mounted single phase electronic active energy meter is a new kind of single phase two wire electronic active energy meter. It adopts many advanced technologies of research and development, like micro-electronic techniques, specialized large-scale integrated circuit, digital sampling and processing technology, SMT technique and so on. The meter completely accord with relevant technical requirements stipulated in the International Standards IEC62052-11 and IEC62053-21 for Class 1 single phase active energy meter. It can accurately measure 50Hz or 60Hz active energy consumption for single phase two wire AC electricity net. It is used for setting in indoor or outdoor meter box. It has following features:High reliability, light weight, specious appearance, convenient installation, etc.

1.工作电压范围：0.9Un-1.1Un；
2.功耗：小于2W(10VA);
3.执行标准：GB/T 17215.321-2008
4.温度特性好，-25℃至55℃温度范围内误差不超过精度范围；
5.轻载特性好，仪表在极低负载时工作具有良好的准确度等级；
6.实际在线计量准确度高；可靠性高，长寿命；
7.安装操作简便，安装位置不受影响；
8.过载能力强，仪表在准确度等级范围内的过载能力可达6倍以上；
9.抗运输能力强，仪表在各种正常运输条件下不会引起误差变化，
    用户开箱后可无须调整。