Type DTSF306/DSSF306 three phase electronic multi-rate watt-hour meter is adopted with large-scale integrated circuit of super-low power loss, digital sampling process technology and SMT production workmanship, designed and manufactured according to the actual requirement of industry customers. All technical performance meet the requirements of IEC standard and China National Standard GB/T17215-2002(IEC62053-21-2003, IEC62052-11-2003) < Class 1 and class 2 static type alternating current active energy watt-hour meter >, GB/T15284-2002 (IEC62052-11-2003) and DL/T645-1997 < Multi-function watt-hour meter communication protocol >. Function and features: 1. Four tariffs, 12 time zones, 12 sets of time-period table, 12 time-periods; Available to set time-period table for day-off. 2. Data can be conserved for 12 months. 3. Automatically judge the power direction, measure active and reverse energy respectively. 4. It is available to set breadth and frequency of measured output impulse of total electricity energy. 5. With the function of monitoring open phase; It is available to record the time of open phase, times and amount of energy. 6. Display with LCD, with the apheliotropic function; Automatically display when power off. 7. With the infrared and RS-485 interface, it is available to connect with reading module of GSM/GPRS. 8. Double protection for programming operation with hardware switch and software password. 9. 1Hz clock pulse output. 10. With double WDT circuits, electromagnetism compatibility is good. 11. With the function of sound-light control alarm, the item of alarm can be set with software in PC terminal. 12. With the function of detecting cover-open, it is available to record times of cover-open and the starting time of recent 10 times of cover-open. 13. Super-low power loss, automatically alarm when battery is short or loss of voltage. Technical parameter: Clock error less than 0.5 second/day, Clock error less than 1.0 second/day when power-off. Output breadth of total pulses: 80m s Supplied current by battery when power-off: ≤ 30uA( battery voltage: 3.6 V) Voltage influence: Range of working power source with good stability. With anti-creeping design. Power-