DDS-121H Series single phase electronic energy meter is used for measuring electric energy in single phase active energy system. This meter 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 from single phase AC electricity net. It is used for setting into indoor or outdoor meter box.It has following features:High reliability, light weight, specious appearance, convenient installation etc.

1.板前式三点固定安装；
2.标准配置5+1位(99999.1kWh)步进电机式脉冲计数器显示，可选择6+1位计数器显示；
3.标准配置有极性的无源近距离电能脉冲输出端口，可选择无极性的无源远动电能脉冲输出端口，　方便与各种AMR系统联接，符合IEC62052-11和IEC62053-21标准；
4.标准配置仅1个LED指示电能脉冲信号(红色)，可选择增加电源状态指示(绿色)和自动检测　负荷电流潮流方向并LED指示(显示黄色时，代表电流潮流反方向)，请在定货时指明；
5.单方向单元件测量单相两线有功电能消耗，与负荷电流潮流方向无关；
6.直接接入式使用，有两种接线方式可供选择，标准配置B型接线，可选择A型接线；
7.标准配置短的接线端子盖，可选择延长型接线端子盖，保护用电安全。

1. Front board mounted with three point fixed installation.
2. Standard configuration 5+1 digits (99999. lkWh)step motor impulse register display, may select 6+1 digits display.
3. Standard configuration with polarity passive energy impulse output terminal (polarity),May select remote polarity passive energy impulse output 　    terminal (nonpolarity), complying with standard IEC 62053-21 and IEC62052-11.
4. Standard configuration one LED light indicate the power impulse signal, may select add power state instruction (green) and load current flow 　　　 direction instruction (yellow means the load current flow reverse).  
5. Measure single phase two wire active energy consumption in one direction with single element, it is not influenced by the direction of load current 　 flow. Complying with standard IEC IEC62053-21.
6. Direct connection,2 types for option, standard configuration connection type B, may select connection type A.
7. Standard configuration short terminal cover, may select extended terminal cover to protect use safety.