1.General DTS43-F type three-phase four wire static watt-hour meter is a new type meter measuring three-phase alternating current active energy and per phase energy. 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 V 1.0 brought forward by power company of Hubei province. Technical data and function: *Starting current: < 0.004 Ib for direct connection, <0.002In for connection through CT. *Display : LED/LCD module display *rated frequency: 50Hz or 60 Hz *Infrared communication: > 8 meters *485 communication: port to port > 1200meters *operate voltage range: normal: 0.7 Un ~ 1.2Un limit: 0 Un ~ 1.2 Un *power consumption: per phase of voltage circuit < 1.0 W 4 VA per phase of current circuit< 1 VA *highest ambient temperature: 70 degree *highest temperature exposure in the sun: 60 degree *lowest ambient temperature: -25 degree *relative humidity: < 95% *Measure bi-direction active energy and accumulate in deliver direction *Current reversal indication in LCD screen *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