1.General DDS43 type single-phase static watt-hour meter is a new type meter measuring single-phase alternating current active energy and it adopts special large-scale integrated circuit, high-performance CPU, as well as advanced surface mounting technology (SMT). Therefore, the meter is characterized with high accuracy, tamper-proof function, high anti-interference, long service life and so on. The meter is easy to operate and can meet the customers' requirements well for its reasonable design. All functions and technological specifications comply with the related provisions and technical requirements specified in IEC 62053-21, and IEC1107:1996. Technical data and function: *rated voltage: 240V *rated frequency: 50Hz *rated current: 10(100)A *power consumption: <2.0W, 10VA *constant: 600imp/kWh *accuracy class: class 1 *operating temperature : -25℃~ 60℃ *relative humidity: < 85% *Electromagnetic compatibility: Comply with the requirements of electrostatic discharge, electromagnetic HF-field, electrical fast transient burst pulse train and surge immunity specified in standard GB/T 17626 *Under power failure, the data can be stored for more than 10 years *LCD display total current active electric energy *Infrared and RS232 communication interface