1. Purpose and scope of use
The DDS * * * * single-phase electronic (Bluetooth) prepaid energy meter is a new type of product with advanced software, hardware, and structural design technology, high measurement accuracy, and the ability to measure positive AC active energy. It has the characteristics of high reliability, high overload, and low power consumption.
Users can scan the QR code on the electricity meter through WeChat to bind the meter (administrator), and the administrator can define the electricity price and other information to be transmitted to the energy meter. The energy meter will deduct the amount in real time based on the user's electricity consumption and electricity price. When the amount in the meter is used up, the energy meter will automatically stop supplying power.
This electric energy meter is an ideal product for intelligent electricity transformation, realizing the commercialization of electric energy, and solving the problem of difficult charging

2. Functions and features
1. LCD screen displaying Chinese characters, Bluetooth communication, 4G communication.
2. The display range for the remaining amount and total electricity consumption can reach 999999.99kwh with eight digits
3. High precision electricity price can reach 99.999999 yuan/kWh for widespread use
4. Strong encryption: WeChat mini program encryption algorithm ensures that system data will not be decrypted.
5. The magnetic holding relay adopts high-power magnetic holding relay, with low power consumption and high reliability.
6. Bluetooth communication and 4G communication make it convenient for administrators to remotely operate and set meter parameters, as well as for users to read meters
&Bluetooth communication enables real-time near-field meter reading, monitoring of user electricity usage status, and other functions
&4G communication enables real-time remote meter reading, monitoring of user electricity usage status, and other functions

3. Specifications and main technical parameters
3.1 Specification Parameters

3.2 Electrical and Mechanical Parameters

3.3 Basic Error


Note: lb is the calibration current, lmax is the rated * high current
3.4 Starting current
Under the conditions of rated voltage, rated power, and power factor of 1.0, the energy meter can operate normally when the load current is as follows.

3.5 Testing Interface
There is a pulse output interface for calibration inside the terminal box of the watch.

4. Main structure and working principle
The electronic components of the electric energy meter are installed on the printed circuit board (PCB), and the upper cover is fixed with screws. The terminal knob box cover can be sealed with lead and fixed with a special screw
The electric energy meter consists of an electric energy measurement system and a CPU data processing system. The measurement system samples current and voltage signals, and after calculation, outputs electrical energy pulses to the CPU data processing system. The CPU data processing system deducts the amount in real-time based on electricity price information and energy pulses.
After the administrator binds the electricity meter, users can pay for electricity according to their needs. The purchase amount and electricity price information are transmitted through the WeChat mini program via Bluetooth on their mobile phones or remotely to the energy meter via 4G. The high security of data encryption in mini programs can ensure reliable use by users. When the purchased amount is used up, the relay in the table will automatically cut off the power supply circuit.

5. Installation and usage methods
5.1 Installation
5.1.1 The electric energy meter shall be verified as qualified before leaving the factory and sealed with lead
5.1.2 The bottom plate of the installation table should be fixed on a solid and fire-resistant wall, with a recommended installation height of about 1.8m and no corrosive gases in the air
5.1.3 The electric energy meter should be wired according to the wiring diagram, and copper wire or copper terminal should be used for connection.
5.2 Instructions for use
After the user scans the code to purchase electricity, the mini program page prompts that the payment has been successful, completing the electricity purchase. (Administrator recharge does not incur any actual fees, and the WeChat mini program page will display the current amount and amount of electricity purchased by the administrator)
5.3 Outline drawing and wiring diagram


5.4.5 Testing


6. Transportation and Storage
6.1 The transportation and unpacking of electric energy meters should not be subjected to severe impacts.
6.2 The electric energy meter should be stored in the original packaging box, with an ambient temperature of -25 ℃~70 ℃, relative humidity not exceeding 85%, and no corrosive gases in the air
6.3 Electric energy meters should be stored in the warehouse and placed on shelves with a stacking height of no more than 5 boxes. After unpacking, the stacking height of individual packaged electric energy meters should not exceed 5 boxes.
7. Precautions
*To ensure the correct and safe use of this product, please have a professional electrician install or disassemble it
*When installing or disassembling, the main power supply must be disconnected
*Strictly follow the product range and avoid short circuit or overload use, otherwise it may damage the product
*It is strictly prohibited to install the product inside a fully enclosed metal casing to avoid affecting wireless communication
*Avoid placing in damp or damp places
*Please do not open the product without authorization, and do not disassemble it with power on
*This product is an electrified product, please stay away from children.