The meter is used for measuring rated frequency 50Hz or 60Hz three phase AC active energy electric power consumption and can realize multi tariffs calculating.

1. DTSF989 series meter has all function which static three-phase kilowatt-hour meter has.
2. Two (or four) tariffs, 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 of LCD. DDSF, DTSF four tariff, ten time section, calendar and clock function. handhold unit, han dhold computer and PC computer can communicates with RS485 or RS232 output interface of the meter. It can indicate and recording loss of phase.