System for calibrating electric energy meter by using Bluetooth frequency division multichannel technology and implementation method

Abstract

The invention discloses a system for calibrating an electric energy meter by using a Bluetooth frequency division multichannel technology and an implementation method. The system is composed of a test power supply, a standard electric energy meter, a detected electric energy meter, a Bluetooth frequency division multi-channel receiving module, an error calculation unit, a standard clock unit, a communication server, a control computer and the like, the novel intelligent electric energy meter is detected by adopting the Bluetooth frequency division multi-channel technology, and wireless communication with the detected electric energy meter is realized through Bluetooth communication when the electric energy meter is detected; meanwhile, electric energy pulses, clock pulses and the like of the detected electric energy meter are wirelessly received, so that verification such as electric energy error calculation, daily timing error calculation and the like is realized. The beneficial effects of the invention are that through the linkage design of the Bluetooth frequency division multi-channel receiving module and the error calculation unit, the purposes of easy position alignment and low possibility of external light interference are realized; the system can be composed of a plurality of parallel epitopes, and each epitope is provided with a group of Bluetooth frequency division multichannel modules, thereby achieving the parallel synchronous verification of multiple epitopes.

Description

Technical Field

[0001] The present invention relates to the technical field related to intelligent Internet of Things electric energy meters, and in particular to a system and implementation method for calibrating electric energy meters using Bluetooth frequency division multi-channel technology. Background Art

[0002] The energy meter calibration device is a special standard metering device. The test power supply provides standard test signal voltage, current, etc. to the energy meter under test and the standard energy meter to measure the energy at the same time. The standard energy meter sends standard energy pulses, and the energy meter under test sends the energy pulses under test. The error calculation unit receives the standard pulses and the pulses under test, and calculates the energy error by comparing the two. Similarly, the energy meter calibration device also has a standard clock source. The energy meter under test outputs a pulse signal of an internal clock, which is used to detect the daily timing error of the energy meter.

[0003] Traditional electric energy meters generally use electrical signals or LED light-emitting tubes to output electric energy pulses and clock pulses, and use RS485 communication interface to communicate with external control equipment, collection equipment, etc. The electric energy meter calibration device receives electric pulses or converts optical pulses into electric pulses through a photoelectric sampling device, performs error calculations, and communicates with the electric energy meter being tested through wired RS485 communication.

[0004] Traditional electricity meters use LED light pulses and clock pulses for output. The electricity meter calibration device is mainly based on RS485 communication and electrical pulse signal access, and cannot calibrate new smart IoT electricity meters. If a photoelectric receiving device is used to receive LED lights and convert them into electrical signals, there are problems such as difficulty in aligning the position and susceptibility to interference from external light. Summary of the invention

[0005] The present invention aims to overcome the above-mentioned deficiencies in the prior art and provides a system and implementation method for calibrating electric energy meters using Bluetooth frequency division multi-channel technology, which is easy to align and not easily disturbed by external light.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A system for calibrating electric energy meters using Bluetooth frequency division multi-channel technology, comprising:

[0008] The control computer is connected to the communication server through the network port and the communication control is carried out by the TCP / IP protocol. The communication server extends multiple ports to communicate with the test power supply, standard electric energy meter, error calculation unit and Bluetooth frequency division multi-channel module respectively;

[0009] Test power supply, output voltage and current signals required by the electric energy meter under test;

[0010] The standard electric energy meter connects the voltage and current signals output by the test power supply to the standard electric energy meter, which measures the standard power electric energy and sends the standard electric energy pulse to the error calculation unit of each meter position for error calculation;

[0011] The standard clock unit provides the standard clock signal required for the daily timing error of the electric energy meter under inspection. The standard clock signal is sent to the error calculation unit of each meter position;

[0012] Multiple parallel detection stations, each detection station is connected to a tested electric energy meter for calibration test; each detection station includes a Bluetooth frequency division multi-channel module, which realizes Bluetooth communication with the tested electric energy meter, and can receive the Bluetooth pulse signal emitted by the built-in Bluetooth module of the tested electric energy meter, and convert the Bluetooth pulse signal into an electrical pulse signal and output it to the error calculation unit; each station includes an error calculation unit, which receives the standard electric energy pulse emitted by the standard electric energy meter and the electric energy pulse of the tested electric energy meter emitted by the Bluetooth frequency division multi-channel module, and performs error calculation.

[0013] The present application discloses a system for calibrating electric energy meters using Bluetooth frequency division multi-channel technology. The system consists of a test power supply, a standard electric energy meter, an electric energy meter to be tested, a Bluetooth frequency division multi-channel receiving module, an error calculation unit, a standard clock unit, a communication server, a control computer, etc. The system adopts a Bluetooth frequency division multi-channel technology in which a carrier bandwidth is divided into sub-channels of multiple different frequency bands, and each sub-channel can transmit one signal in parallel. The system cooperates with the test power supply, the standard electric energy meter, the error calculation unit, the control computer, etc. to calibrate a new type of intelligent electric energy meter. When calibrating the electric energy meter, the system communicates wirelessly with the electric energy meter to be tested through Bluetooth communication, and at the same time, the electric energy pulse and clock pulse of the electric energy meter to be tested are wirelessly received to realize the electric energy error calculation, the daily time error calculation, etc. The purpose of easy alignment and not being easily disturbed by external light is achieved through the linkage design of the Bluetooth frequency division multi-channel receiving module and the error calculation unit.

[0014] Preferably, an interference signal absorbing device is designed inside the system, and the interference signal absorbing device adopts a double-layer structure of a metal substrate + a ferrite absorbing surface to cover the directional antenna corresponding to the Bluetooth frequency division multi-channel module, wherein the system does not cover the side facing the electric energy meter under test, and the Bluetooth frequency division multi-channel module reads the status and data of the electric energy meter under test and is connected to the communication server through a parallel RS485 port, converts the RS485 port into a network port, and communicates with the control computer.

[0015] The present invention also provides a method for implementing the calibration of electric energy meters using Bluetooth frequency division multi-channel technology, and the specific operation steps are as follows:

[0016] (1) The control computer sends the control source output status signal to the test power supply according to the requirements of the verification test, sends the parameters required for error calculation to the error calculation unit, and sends the required communication address and pairing information to the Bluetooth frequency division multi-channel module;

[0017] (2) The control computer sends voltage and current start commands to test the voltage and current required for power output detection; each meter position Bluetooth frequency division multi-channel module is paired and connected with the power meter to be tested;

[0018] (3) The standard electric energy meter outputs standard electric energy pulses and transmits them to the error calculation unit of each meter position; the standard clock unit outputs standard clock pulses and transmits them to the error calculation unit of each meter position; the Bluetooth frequency division multi-channel module receives the electric energy pulses and clock pulses of the electric energy meter under inspection, converts the Bluetooth pulses into electric pulses, and transmits them to the error calculation unit of each meter position;

[0019] (4) The error calculation unit calculates the electric energy error based on the standard electric energy pulse and the electric energy pulse of the electric energy meter under test; calculates the daily timing error based on the standard clock pulse and the clock pulse of the electric energy meter under test; and sends the error to the control computer through the communication server via RS485.

[0020] The implementation method is to test the voltage and current signals required for the power supply output verification under the control of the upper control computer. The standard electric energy meter is responsible for measuring the standard power electric energy and sending the standard electric energy electric pulse. The electric energy meter under test is connected to the voltage and current signals, and the electric energy pulse and clock pulse of the electric energy meter under test are sent through the communication sending module built in the electric energy meter under test. The equipped Bluetooth frequency division multi-channel module converts the received Bluetooth pulse into an electric pulse and outputs it to the error calculation unit. The error calculation unit calculates the electric energy error and the daily timing error, etc., and sends them to the control computer through the communication server. The control computer is also responsible for the communication pairing connection between the electric energy meter under test and the Bluetooth frequency division multi-channel module to realize the communication with the electric energy meter under test. It can be composed of multiple parallel tables, each table is configured with a group of Bluetooth frequency division multi-channel modules to realize parallel and synchronous verification of multiple tables.

[0021] Preferably, in step (2), specifically: the control computer controls the voltage and current required for the test power supply output detection; the voltage and current are input into the standard electric energy meter and each electric energy meter to be tested, and the access voltage signal of the standard electric energy meter and the electric energy meter to be tested is connected in parallel, and the current signal is connected in series, and the same signal is accessed; under the control of the control computer, the Bluetooth frequency division multi-channel module of each meter position is paired and connected according to the communication MAC address of the electric energy meter to be tested at the meter position, and the working frequency band of the Bluetooth frequency division multi-channel module is set according to the meter position serial number information.

[0022] Preferably, in step (3), a pulse acquisition circuit is provided in the error calculation unit, and the pulse acquisition circuit acquires standard electric energy pulses, standard clock pulses, and Bluetooth pulses. The circuit consists of three input pulse signals, and each input pulse signal passes through a fuse, an electrostatic surge protector, a bipolar transistor, a matching resistor, an optocoupler, and a Schmitt trigger inverter and is then input into the MCU for processing. The MCU acquires standard electric energy pulses, standard clock pulses, and Bluetooth pulse signals and converts them into electric pulses, and obtains electric energy and daily timing errors after calculation.

[0023] Preferably, in step (4), the electric energy error calculation formula is: electric energy error = (the number of pulses that should be accrued by the standard electric energy meter - the number of pulses that should be accrued by the tested electric energy meter) * 100 / the number of pulses that should be accrued by the standard electric energy meter.

[0024] Preferably, in step (4), the daily timing error calculation formula is: clock error = (86400*measured crystal oscillator frequency) / calibrated crystal oscillator frequency-86400, wherein the measured crystal oscillator frequency is the clock pulse output by the tested electric energy meter, and the calibrated crystal oscillator frequency is the standard clock pulse output by the standard clock unit.

[0025] The beneficial effects of the present invention are: the purpose of easy alignment and not susceptible to interference from external light is achieved through the linkage design of the Bluetooth frequency division multi-channel receiving module and the error calculation unit; it can be composed of multiple parallel epitopes, each epitope is configured with a group of Bluetooth frequency division multi-channel modules, so as to realize parallel and synchronous calibration of multiple epitopes. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a system principle block diagram of the present invention;

[0027] Figure 2 It is a flow chart of the implementation method of the present invention;

[0028] Figure 3 It is the circuit schematic diagram of the pulse acquisition circuit;

[0029] Figure 4 This is a physical picture of the Bluetooth frequency division multi-channel module;

[0030] Figure 5 This is a working effect diagram of the Bluetooth frequency division multi-channel module. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0032] The new generation of smart IoT electricity meters adopts a multi-core modular design. Based on the IoT communication requirements and electrical safety requirements, the RS485 interface and weak current signal ports such as electric energy pulses and clock pulses of traditional electricity meters are cancelled, and a Bluetooth communication module is used to realize communication with external devices. Traditional electricity meters use LED light pulses and clock pulses for output, and the calibration device is mainly based on RS485 communication and electrical pulse signal access, which cannot calibrate the new smart IoT electricity meters. If a photoelectric receiving device is used to receive the LED light and convert it into an electrical signal, there are problems such as difficulty in aligning the position and susceptibility to interference from external light. Therefore, the present invention designs a new calibration method, which adopts a Bluetooth frequency division multi-channel module. A Bluetooth frequency division multi-channel module is added to each table position of the calibration device, which has the function of simultaneously collecting two Bluetooth pulses, meets the calibration requirements of the new generation of multi-core smart electricity meters, and is paired one-to-one with the meter under test through the MAC address. When the electric energy meter under test communicates, it first establishes a connection with the Bluetooth frequency division multi-channel module, and the Bluetooth frequency division multi-channel module is then connected to the communication server. The active pulse and daily timing pulse of the electric energy meter under test are converted into electrical pulses by the Bluetooth frequency division multi-channel module and then enter the error calculation unit. A method for realizing the calibration of new intelligent electric energy meters is achieved by utilizing the low power consumption and multi-band technology of the Bluetooth module in combination with a test power supply, a standard electric energy meter, an error calculation unit, a control computer, etc.

[0033] Bluetooth frequency division multi-channel technology uses frequency hopping spread spectrum technology to reduce co-frequency interference by quickly changing the frequency. This technology can effectively avoid interference, thereby ensuring the reliability of transmission and giving full play to communication efficiency. Bluetooth frequency division multi-channel technology has a fast transmission rate and supports connections between multiple devices to form a flexible communication network. Bluetooth frequency division multi-channel technology can fully meet the verification requirements of the new generation of smart IoT electric energy meters using multi-core modular design.

[0034] like Figure 1 In the embodiment described, a system for calibrating an electric energy meter using Bluetooth frequency division multi-channel technology includes:

[0035] The control computer is connected to the communication server through the network port and the communication control is carried out by the TCP / IP protocol. The communication server extends multiple ports to communicate with the test power supply, standard electric energy meter, error calculation unit and Bluetooth frequency division multi-channel module respectively;

[0036] Test power supply, output voltage and current signals required by the electric energy meter under test;

[0037] The standard electric energy meter connects the voltage and current signals output by the test power supply to the standard electric energy meter, which measures the standard power electric energy and sends the standard electric energy pulse to the error calculation unit of each meter position for error calculation;

[0038] The standard clock unit provides the standard clock signal required for the daily timing error of the electric energy meter under inspection. The standard clock signal is sent to the error calculation unit of each meter position;

[0039] Multiple parallel detection stations, each detection station is connected to a tested electric energy meter for calibration test; each detection station includes a Bluetooth frequency division multi-channel module, which realizes Bluetooth communication with the tested electric energy meter, and can receive the Bluetooth pulse signal emitted by the built-in Bluetooth module of the tested electric energy meter, and convert the Bluetooth pulse signal into an electrical pulse signal and output it to the error calculation unit; each station includes an error calculation unit, which receives the standard electric energy pulse emitted by the standard electric energy meter and the electric energy pulse of the tested electric energy meter emitted by the Bluetooth frequency division multi-channel module, and performs error calculation.

[0040] While verifying the test error, the Bluetooth frequency division multi-channel module of each meter position realizes Bluetooth communication with the electric energy meter under test at that meter position. Considering that the automated verification system usually adopts a closed mechanism, the wireless signal is reflected multiple times inside the system, which may interfere with the Bluetooth frequency division multi-channel module from all directions. For this reason, an interference signal absorption device is designed inside the system. The interference signal absorption device uses a double-layer structure of a metal substrate + ferrite absorbing surface to cover the directional antenna corresponding to the Bluetooth frequency division multi-channel module. The system does not cover the side facing the electric energy meter under test, combining the advantages of the small penetration depth of metal materials and the low reflectivity of absorbing materials, absorbing and reflecting interference signals, and further enhancing the directional receiving ability of the directional antenna by about 3 to 5 dB. The Bluetooth frequency division multi-channel module reads the status and data of the electric energy meter under test and connects to the communication server through the parallel RS485 port, converts the RS485 port into a network port, and communicates with the control computer.

[0041] like Figure 2 In the embodiment described above, the present invention also provides a method for implementing the calibration of an electric energy meter using Bluetooth frequency division multi-channel technology, and the specific operation steps are as follows:

[0042] (1) The control computer sends the control source output status signal to the test power supply according to the requirements of the verification test, sends the parameters required for error calculation to the error calculation unit, and sends the required communication address and pairing information to the Bluetooth frequency division multi-channel module;

[0043] (2) The control computer sends voltage and current start commands to test the voltage and current required for power output detection; each meter position Bluetooth frequency division multi-channel module is paired and connected with the power meter to be tested;

[0044] Specifically: the control computer controls the voltage and current required for the test power supply output detection; the voltage and current are input into the standard electric energy meter and each electric energy meter under test, and the access voltage signal of the standard electric energy meter and the electric energy meter under test is connected in parallel, and the current signal is connected in series, and the same signal is accessed; under the control of the control computer, the Bluetooth frequency division multi-channel module of each meter position is paired and connected according to the communication MAC address of the electric energy meter under test at the meter position, and the working frequency band and other working states of the Bluetooth frequency division multi-channel module are set according to information such as the meter position serial number.

[0045] (3) The standard electric energy meter outputs a standard electric energy pulse and transmits it to the error calculation unit of each meter position; the standard clock unit outputs a standard clock pulse and transmits it to the error calculation unit of each meter position; the Bluetooth frequency division multi-channel module receives the electric energy pulse and clock pulse of the electric energy meter under test, converts the Bluetooth pulse into an electrical pulse, and transmits it to the error calculation unit of each meter position; the Bluetooth frequency division multi-channel module of each meter position can simultaneously receive the electric energy pulse, clock pulse and other synchronous pulses emitted by the built-in Bluetooth module of each electric energy meter under test, convert the Bluetooth pulse into an electrical pulse, and transmit it to the error calculation unit of each meter position, and the error calculation unit calculates the electric energy error and the daily time error;

[0046] The error calculation unit is equipped with a pulse acquisition circuit, such as Figure 3 As shown, the pulse acquisition circuit collects standard power pulses, standard clock pulses, and Bluetooth pulses. The circuit consists of three input pulse signals from the PA / PH, QA / QH, and MH terminals. Each input pulse signal passes through a FUSE fuse to prevent the circuit board from burning out due to abnormal external signals; then it passes through the PRTR5V0U2AX electrostatic surge protector, whose main function is to provide electrostatic discharge (ESD) protection to prevent electrostatic discharge and other transients in the circuit from damaging sensitive devices; then it passes through the MMBT5401 bipolar transistor, which is mainly used for signal amplification in this circuit; then it passes through some matching resistors and is optically isolated through the LVT-816S optocoupler to prevent signal interference and improve the stability of pulse transmission; finally, the signal passes through the 74HC14 Schmitt trigger inverter, which is mainly used to convert slowly changing input signals into clear, jitter-free output signals. After passing through the protection device, amplifier, and Schmitt inverter, the pulse signal is input into the MCU for processing. The MCU collects the electric energy pulses from the standard electric energy meter, the standard clock pulses from the standard clock unit, and the electric pulses converted from the Bluetooth pulse signal, and then calculates the electric energy and daily timing error.

[0047] (4) The error calculation unit calculates the electric energy error based on the standard electric energy pulse and the electric energy pulse of the electric energy meter under test; calculates the daily time error based on the standard clock pulse and the clock pulse of the electric energy meter under test; sends the error to the control computer via the communication server through RS485; each meter position calculates the electric energy error and the daily time error in parallel, communicates with the communication server through RS485, sends them to the communication server, and is forwarded to the control computer by the communication server. The calculation formula is as follows:

[0048] The formula for calculating the electric energy error is: electric energy error = (the number of pulses that the standard electric energy meter should accrue - the number of pulses that the tested electric energy meter should accrue) * 100 / the number of pulses that the standard electric energy meter should accrue;

[0049] The daily timing error calculation formula is: clock error = (86400*measured crystal oscillator frequency) / calibrated crystal oscillator frequency-86400, where the measured crystal oscillator frequency is the clock pulse output by the tested electric energy meter, and the calibrated crystal oscillator frequency is the standard clock pulse output by the standard clock unit.

[0050] According to the type of the energy meter to be tested, the calibration system can be a single-phase energy meter calibration system or a three-phase energy meter calibration system. The single-phase energy meter calibration system is equipped with a single-phase test power supply and a single-phase standard energy meter; the three-phase energy meter calibration system is equipped with a three-phase test power supply and a three-phase standard energy meter; the calibration system can be an independent manually operated calibration system, which is manually operated and controlled on the upper computer, and the energy meter to be tested is manually installed and removed; the calibration system can be a unit in an automated calibration assembly line system, and multiple units can realize automatic loading and unloading of meters and automatic connection and removal of wires through automatic logistics, automatic connection and removal of wires and other units, and automatic calibration through the master control server, realizing an assembly line type automated calibration system; this technology can also be used for other test and detection systems of energy meters.

[0051] Each table in the verification system is equipped with a Bluetooth frequency division multi-channel module, such as Figure 4 As shown, the Bluetooth frequency division multi-channel module supports Bluetooth communication of the smart IoT meter; under the control of the host computer, the parallel Bluetooth frequency division multi-channel modules are paired and connected according to the communication MAC addresses of the electric energy meters under inspection at their respective table positions, and the working frequency bands and other working states of the Bluetooth frequency division multi-channel modules are set according to information such as the table position sequence number.

[0052] The working effect of Bluetooth frequency division multi-channel module is as follows Figure 5 As shown. The Bluetooth frequency division multi-channel module is used to realize Bluetooth communication with the electric energy meter under test; the Bluetooth frequency division multi-channel module can receive the electric energy pulse and clock pulse sent by the electric energy meter under test during communication, which is used to calculate the electric energy error and daily time error. The above-mentioned Bluetooth communication and pulse receiving and sending method are used to realize the calibration of the new electric energy meter, which is used for ordinary manual calibration devices or assembly line type automatic calibration units.

[0053] In summary, the present application discloses a method for identifying an electric energy meter using Bluetooth frequency division multi-channel technology, which adopts a Bluetooth frequency division multi-channel technology in which a carrier bandwidth is divided into multiple sub-channels of different frequency bands, and each sub-channel can transmit a signal in parallel. The method cooperates with a test power supply, a standard electric energy meter, an error calculation unit, a control computer, etc. to calibrate a new type of intelligent electric energy meter. When calibrating the electric energy meter, the method communicates with the electric energy meter under test wirelessly through Bluetooth communication, and at the same time wirelessly receives the electric energy pulse and clock pulse of the electric energy meter under test, so as to realize the electric energy error calculation, the daily time error calculation and other calibrations. The system consists of a test power supply, a standard electric energy meter, an electric energy meter under test, a Bluetooth frequency division multi-channel receiving module, an error calculation unit, a standard clock unit, a communication server, a control computer, etc. Under the control of the control computer, The test power outputs the voltage and current signals required for calibration. The standard electric energy meter is responsible for measuring the standard power electric energy and emitting standard electric energy pulses. The electric energy meter under test is connected to the voltage and current signals, and the electric energy pulses and standard clock pulses of the electric energy meter under test are sent through the built-in communication sending module of the electric energy meter. The equipped Bluetooth frequency division multi-channel receiving module converts the received Bluetooth pulses into electric pulses and outputs them to the error calculation unit. The error calculation unit calculates the electric energy error and daily timing error, etc., and sends them to the control computer through the communication server. The control computer is also responsible for the communication pairing connection between the electric energy meter under test and the Bluetooth frequency division multi-channel module to realize the communication with the electric energy meter under test. The calibration system can be composed of multiple parallel tables, each of which is equipped with a group of Bluetooth frequency division multi-channel modules to realize parallel and synchronous calibration of multiple tables.

Claims

1. A system for calibrating electric energy meters using Bluetooth frequency division multi-channel technology, characterized in that: include: The control computer is connected to the communication server through the network port and the communication control is carried out by the TCP / IP protocol. The communication server extends multiple ports to communicate with the test power supply, standard electric energy meter, error calculation unit and Bluetooth frequency division multi-channel module respectively; Test power supply, output voltage and current signals required by the electric energy meter under test; The standard electric energy meter connects the voltage and current signals output by the test power supply to the standard electric energy meter, which measures the standard power electric energy and sends the standard electric energy pulse to the error calculation unit of each meter position for error calculation; The standard clock unit provides the standard clock signal required for the daily timing error of the electric energy meter under inspection. The standard clock signal is sent to the error calculation unit of each meter position; Multiple parallel detection stations, each detection station is connected to a tested electric energy meter for calibration test; each detection station includes a Bluetooth frequency division multi-channel module, which realizes Bluetooth communication with the tested electric energy meter, and can receive the Bluetooth pulse signal emitted by the built-in Bluetooth module of the tested electric energy meter, and convert the Bluetooth pulse signal into an electrical pulse signal and output it to the error calculation unit; each station includes an error calculation unit, which receives the standard electric energy pulse emitted by the standard electric energy meter and the electric energy pulse of the tested electric energy meter emitted by the Bluetooth frequency division multi-channel module, and performs error calculation.

2. According to claim 1, a system for calibrating electric energy meters using Bluetooth frequency division multi-channel technology is characterized in that: An interference signal absorption device is designed inside the system. The interference signal absorption device adopts a double-layer structure of a metal substrate + a ferrite absorbing surface to cover the directional antenna corresponding to the Bluetooth frequency division multi-channel module. The system does not cover the side facing the electric energy meter under test. The Bluetooth frequency division multi-channel module reads the status and data of the electric energy meter under test and is connected to the communication server through a parallel RS485 port, converts the RS485 port into a network port, and communicates with the control computer.

3. A method for verifying electric energy meters using Bluetooth frequency division multi-channel technology, characterized in that: The specific steps are as follows: (1) The control computer sends the control source output status signal to the test power supply according to the requirements of the verification test, sends the parameters required for error calculation to the error calculation unit, and sends the required communication address and pairing information to the Bluetooth frequency division multi-channel module; (2) The control computer sends voltage and current start commands to test the voltage and current required for power output detection; each meter position Bluetooth frequency division multi-channel module is paired and connected with the power meter to be tested; (3) The standard electric energy meter outputs standard electric energy pulses and transmits them to the error calculation unit at each meter position; The standard clock unit outputs a standard clock pulse and sends it to the error calculation unit of each meter position; the Bluetooth frequency division multi-channel module receives the electric energy pulse and clock pulse of the electric energy meter under inspection, converts the Bluetooth pulse into an electric pulse, and sends it to the error calculation unit of each meter position; (4) the error calculation unit calculates the electric energy error based on the standard electric energy pulse and the electric energy pulse of the electric energy meter under test; The daily timing error is calculated based on the standard clock pulse and the clock pulse of the electric energy meter under inspection; the error is sent to the control computer via the communication server through RS485.

4. The method for verifying electric energy meters using Bluetooth frequency division multi-channel technology according to claim 3 is characterized in that: In step (2), specifically: the control computer controls the voltage and current required for the test power supply output detection; the voltage and current are input to the standard electric energy meter and each electric energy meter to be tested, the access voltage signal of the standard electric energy meter and the electric energy meter to be tested is connected in parallel, and the current signal is connected in series, and the same signal is accessed; under the control of the control computer, the Bluetooth frequency division multi-channel module of each meter position is paired and connected according to the communication MAC address of the electric energy meter to be tested at the meter position, and the working frequency band of the Bluetooth frequency division multi-channel module is set according to the meter position serial number information.

5. The method for realizing the calibration of electric energy meters using Bluetooth frequency division multi-channel technology according to claim 3 is characterized in that: In step (3), a pulse acquisition circuit is provided in the error calculation unit, and the pulse acquisition circuit acquires standard electric energy pulses, standard clock pulses, and Bluetooth pulses. The circuit consists of three input pulse signals, and each input pulse signal passes through a fuse, an electrostatic surge protector, a bipolar transistor, a matching resistor, an optocoupler, and a Schmitt trigger inverter and is then input into the MCU for processing. The MCU acquires standard electric energy pulses, standard clock pulses, and Bluetooth pulse signals and converts them into electric pulses, and obtains electric energy and daily timing errors after calculation.

6. The method for verifying electric energy meters using Bluetooth frequency division multi-channel technology according to claim 3 is characterized in that: In step (4), the formula for calculating the electric energy error is: electric energy error = (the number of pulses that the standard electric energy meter should have - the number of pulses that the tested electric energy meter should have) * 100 / the number of pulses that the standard electric energy meter should have.

7. The method for verifying electric energy meters using Bluetooth frequency division multi-channel technology according to claim 3 is characterized in that: In step (4), the daily timing error calculation formula is: clock error = (86400*measured crystal oscillator frequency) / calibrated crystal oscillator frequency-86400, wherein the measured crystal oscillator frequency is the clock pulse output by the tested electric energy meter, and the calibrated crystal oscillator frequency is the standard clock pulse output by the standard clock unit.

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