Three-phase active energy meter works outlined a three-phase active energy meter is the use of a dedicated three-phase active energy metering IC were measured using high-performance CPU for data processing, through infrared and RS485 port for data exchange with the outside world, sampling LCD Information phase active energy meter communication a) This table has RS485, IR two completely independent communication interface, infrared meter reading function to meet the requirements DL / 645-1997 multifunction meter communication protocol. b) infrared communication and RS485 communication at the physical layer independence, damaged a communications channel does not affect the other channel, communication baud rate of 1200, half meter, in line DL / T645-97 statute, order response time frame at 20-500 ms. c) infrared communication interface: Communication distance: ≥ 4m, communication angle: ≥ ± 15 ° d) RS485 communication interface: To protect the meter, RS485 communication interface and implement internal circuit is electrically isolated from the meter single phase prepaid meter sharing, and fail-safe circuitry. e) with hardware programming switch meter single phase prepaid energy meter time-price ladder, and can be sealed. f) must be programmed in the hardware switch is closed and the password is correct, can be programmed. g) display: The LCD display shows the total power, A-phase power, B-phase power, C-phase power, high office number, office number, and low pulse constant. Power display for six integers and two decimals sale of three-phase active energy meter meter safeguards since sold within the next eighteen months, in the user manual to comply with the requirements and conditions of the factory seal is intact, if quality problems, the company responsible for the free repair or replacement. Winbond rail mounting meter installation required constant attention view of technical points: First, the principle galvanometer G and G are the main parameters ammeter energized coil in a magnetic field based on the principle of action produced by the magnetic moment deflection made, and pointer angle θ is proportional to the current intensity I, i.e. θ = kI, so the dial gauge is uniform. The main parameters of meter are: header resistance Rg: namely, the coil resistance ammeter full bias current Ig: namely ammeter allowed by the maximum current value, then the pointer reaches the full bias; full bias voltage U: pointer over that side, plus In voltmeter head at both ends, so Ug = Ig Rg two, ammeter voltmeter modded modified to:? greater voltage measurement method: If the range is expanded n times, it should give the ammeter in series with a resistor. Therefore, expanding the range of multiples, the greater the resistance value of the series, the larger the internal resistance of the voltmeter. Third, the ammeter ammeter modded modified objective is: the higher the measure larger currents and therefore expand the range of multiple, smaller parallel resistance value, the smaller the resistance ammeter. Description: Meter after modification by the maximum voltage and current meter G maximum current Imax and Umax becomes much ends? The modified voltmeter or ammeter three-phase prepaid energy meter time-price ladder, although the range expanded, but the maximum current through the ammeter or added to both ends of the maximum voltage meter ammeter still full bias current Ig and full bias voltage Ug just because of the shunt voltage divider circuit and a parallel circuit of the series to make the table range expanded. A three-phase multi-card prepaid irrigation meter, power meter, meter by Winbond Winbond Power Technology Corporation. Winbond Power Technology Co., Ltd. (www.china-huabang.com) strong, credible, in Wenzhou, Zhejiang, electrical instrumentation industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving Winbond innovative ideas will lead into the glorious instrument and you work for a better future!