Winbond Energy Meter Category: 1, according to the structure and working principle points: inductive watt-hour meter, electronic watt-hour meter. Electronic energy meter can be further divided into all electronic energy meter and electromechanical pulse energy meter. 2, according to the accuracy of the level of points: ordinary level: 0.2S, 0.2,0.5S, 0.5,1.0,2.0,3.0 level, for measuring electrical energy. Precision level: 0.01,0.05 level, mainly as a check-level calibration of ordinary energy meter basis. 3, divided by purpose: 1) active energy meter. 2) Reactive energy meter. 3) The maximum demand scale. 4) Rate Power Meter. 5) Multi-function energy meter. (6) According to the nature of access to power can be divided into: AC power meter and DC power meter. (7) In accordance with the meter installation wiring can be divided into direct access and indirect access (through the transformer access); which due to the different measurement circuits, usually divided into single-phase energy meter, three-phase three-wire Meter and three-phase four-wire watt-hour meter. (8) According to the average life expectancy, single-phase induction watt-hour meter is divided into: ordinary type and long-life technology watt-hour meter. DDS228 single-phase electronic energy meter Overview: Winbond instrument production DDS228 single-phase electronic energy meter (hereinafter referred to as energy meter) ADI's single-phase energy measurement chip ADE7755 US and advanced SMT and wave soldering process, according to the actual power consumption of the user design, manufacture new Meter. The meter in line with GB / T17215.321-2008 "Level 1 and Level 2 static AC active watt-hour meter" and IEC1036-1996 international standards of all the technical requirements. Has good anti-electromagnetic interference, low power consumption, high precision, anti-theft, high overload, long life characteristics. DDS228 single-phase electronic energy meter features: 1, according to the long life standard design 2, the error is stable, good linearity 3, low temperature characteristics, -40 ℃ ~ 75 ℃ within the measurement accuracy is not over-tolerance 4, light load characteristics, the instrument still maintain good accuracy at low load 5, the entire table low power consumption 6, high measurement accuracy, in a variety of harmonic conditions to maintain the normal measurement accuracy 7, anti-theft ability 8, easy to install, the installation location is not affected 9, factory-free tuning, the instrument in normal transport, storage conditions will not cause changes in error DDS228 single-phase electronic energy meter technical specifications: Reference voltage: 220V Reference current: 1.5 (6) A, 2.5 (10) A, 5 (20), 5 (30) A, 5 (40) A, 10 (40) A, 15 (60) A, 20 (80) A , 30 (100) A Reference frequency: 50Hz or 60Hz Accuracy level: 1.0 or 2.0 level Voltage range: 0.7Un ~ 1.3Un Environmental conditions: Standard operating temperature: -30 ℃ ~ 70 ℃ Limit working temperature: -40 ℃ ~ 75 ℃ Relative humidity: ≤90% Power consumption: voltage line 1W / 5VA, current line ≤ 0.5VA Overall dimensions: 168mm * 110mm * 61mm