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DDSF single-phase electronic multi-fee-rate power meter The DDSF type single-phase electronic multi-fee-rate power meter has been selected with the imported integrated circuits such as power metering, clock, storing, etc., and adopted with the SMT surface mounting and the wave-soldering processes for manufacture: the product has the features of electric-larceny proof, high precision, high reliability, high overload, low power consumption, small volume, low weight, etc.; it can be widely used in the time-share metering for the single-phase AC active power of urban and rural residents, plant enterprises, business, etc. Functions and characteristics: 1. Accurately measure the electricity energy with power in the single-phase AC in separate time 2. Broad range, high precision, long life cycle, calibration and maintenance free 3. Automatically prevent electricity theft, and the electricity with power in the reverse direction will be calculated into that in the positive direction, and can record the total time of the operation in reverse direction, electricity volume in reverse direction and the starting time of the last time of operation in reverse direction 4. 4 types of charge rates of tip, peak, plane and valley and 12 charge time periods can be set up, and the minimum interval between the time periods is 1 minute. 5. Electricity volume in each month will be automatically converted to save on a designated date, and the 12-month historical data can be saved 6. Multi items of display contents, and the display content and time can be randomly set up 7. Operating parameters including temperature inside the meter, battery voltage and programming status, etc can be recorded and read 8. High-precision time clock, with the temperature compensation, to ensure the daily timing error within 0.5 second per day 9. Triple data backups, and the data can be saved for ten years without loss after the power failure 10. Built-in RS485 and infrared communication interfaces, and the communication channels are independent with each other 11. Enhanced protection for communication interface, to prevent thunder and static, and can resist the power circuit connected from the outside 12. Optional LCD screen or LED digital screen in the Chinese language Technical parameters: Standard: GB/T17215-2002 (IEC61036: 2000, IDT) GB/T15284-2002 DL/T645-1997 Precision level: Level 1 and 2 Reference voltage: 220v Current specification: 2.5 (10) A, 5 (40) A, 10 (40) A, 20 (100) A Reference frequency: 50Hz/60Hz Working voltage: 0.7Un 1.3Un Limit working voltage: 0.65Un 1.9Un Working temperature : -20°C +55°C Limit working temperature:-35°C +65°C Power consumption: Voltage loop: ≤1W, 5VA Current loop: ≤1VA (1b) Life cycle: >15 years Clock error: ≤0.5 s/d