The meter is used for measuring rated frequency 50Hz or 60Hz single phase AC active energy electric power consumption and can realize many tariffs calculating and collecting transcription meter funactions.

1. DDSF989 series meter has all function which static single-phase kilowatt-hour meter has.
2. Two (or four) tariff, ten time section;
3. Calendar and clock function
4. RS485 or S232 output interface (to be selected) and concentrate record
5. Infrared communication interface;
6. Indicate by two counters or LCD. DDSF, DTSF four tariff, ten time section; Calendar and clock function; It can copy and set meter by hand-hold computer and PC computer can communicates with RS232 output interface;