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DDSY prepaid meters with a variety of anti-theft function, DDSY prepaid meter starting current, no creeping, wide load, low power consumption, DDSY prepaid meter error curve is straight, long-run stability, DDSY prepaid Meter appearance, small size, light weight, easy installation. DDSY prepaid meter accuracy: all-electronic design, built-in import special chip, accuracy is not frequency, temperature, voltage, higher harmonics influence. Long life: the use of SMT technology, optimized circuit design, no need to adjust the circuit after the machine factory. Low power consumption: the use of low-power design, reduce line loss. Pre-charge; non-contact IC card to transfer data, data readback, including: readback of total consumption, remaining capacity, the cumulative purchase of electricity in the table, the total purchase frequency and other information. Storage table constant, the initial value, the user address, name and other information. Overload alarm off, the remaining battery alarm, to remind users to buy electricity. Technical Specifications: Long life base table, extend the life cycle accuracy rating for two current range; 5 (20) A 5 (30) A 10 (40) A 20 (80) A power: ≤1W major technical indicators 1, AD7755 chip used by the US, stable and accurate, and reliable performance 2. Accuracy: 1.0, in line with GB / T17215-1998, IEC1036-1996 3, current specifications: 5 (20) A, 5 (30) A, 10 (40) A, 20 (80) A 4, Rated voltage: AC220V 5, rated frequency: 50Hz 6, starting current: 0.4% Ib 7, power consumption: ≤1W 8, ambient operating conditions: -20 ℃ ~ + 55 ℃, relative humidity not more than 85% (temperature + 25 ℃) 9, immunity to electromagnetic interference, and can run 10 power in harsh environments, strengthening process control, unique technology to ensure high reliability design