electronic energy meter    (EEM) are functionally superior to traditional Ferrari hub meters. An important advantage of EEM is that under non-linear loads, its measurement accuracy is very high, and electronic measurement is more robust than conventional mechanical instruments. Power companies benefit from EEM in three important ways

  1. Through electronic design and prepayment interface, the cost of theft and corruption on the distribution network is reduced.
    2. The electronic energy meter measures the current in the phase and neutral wires, and calculates the power consumption according to the larger of the two currents.
    3. EEM improves the cost and quality of power distribution.

How does EEM work?

The traditional mechanical energy meter is based on the "magnetic induction" phenomenon. It has a rotating aluminum wheel (called Ferriwheel) and many gears. According to the direction of current flow, Ferriwheel rotates, causing other wheels to rotate. This will be converted to the corresponding measured value in the display section. Because many mechanical parts are involved, mechanical defects and malfunctions are common. More manipulation and current opportunities for theft will be higher.

Electronic energy meters are based on digital microtechnology (DMT) and do not use moving parts. Therefore, EEM is called "static energy meter". In EEM, precise functions are controlled by specially designed ICs called ASICs (application specific integrated circuits). ASICs are only built for specific applications that use embedded system technology. Now, similar ASICs are used in washing machines, air conditioners, automobiles, digital cameras, etc.

In addition to ASICs, there are analog circuits, voltage transformers, current transformers, etc. in EEM to "sample" current and voltage. Compare the "input data" (voltage) with the programmed "reference data" (voltage) and finally provide a "voltage rate" for the output. Then, the output will be converted into "digital data" by the AD converter (analog-to-digital converter) in the ASIC.

The digital data will then be converted to "average". The average / average is a measure of power. The output of the ASIC can be obtained by the "pulse" indicated by the LED (Light Emitting Diode) on the front panel of the EEM. These pulses are equal to the average kilowatt-hour (kWh / unit). Different brands of EEM use different ASICs with different kWh. But in EEM, 800 to 3600 pulses / kWh are usually used to generate the ASIC. The output of the ASIC is enough to drive the stepper motor to display through the rotation of the digital embossing wheel. The output pulse is indicated by LED. ASIC is manufactured by Analogue Device Company. ADE 7757 IC is usually used to manufacture EEM in many countries. ADE 7555/7755 ASIC maintains the international standard CLASS I IEC 687/1036.


Zhejiang Tepsung Electric Meter Co.,Ltd . was established in 1985. We focus on the field of electronic energy meters and electromechanical energy meters. We have established a mature and professional team in instrument design, production and sales (pre-sales and after-sales), which has been widely praised at home and abroad. More than 40 model products have obtained international certificates and type test reports: ISO9001, KEMA, CE, STS certificates and more domestic certificates. Our market covers Europe, East Asia, Southeast Asia, Middle East, South America and Africa. Welcome to consult and order: https://www.yhddb.com/