System structure of measuring instrument and measuring instrument

Abstract

The application relates to the technical field of measuring instruments, and discloses a system structure of a measuring instrument and the measuring instrument, wherein the system structure of the measuring instrument comprises a signal plate, a display plate, a power supply plate and at least one module plate; the signal plate is fixedly connected with the display plate; a signal input module or a signal output module is arranged on the module plate; the module plate is movably connected with the power supply plate; a power supply module is arranged on the power supply plate; the power supply plate is fixedly connected with the display plate; a central processing unit, a display screen electrically connected with the central processing unit and an input device for receiving input instructions are arranged on the display plate. The module plate is movably connected with the power supply plate, the connection can be selected according to specifications, resource optimization configuration is realized, the cost is reduced, and the flexibility and adaptability of the system are improved.

Description

Technical Field

[0001] This application relates to the field of measuring instrument technology, and in particular to a system structure and measuring instrument of a measuring instrument. Background Technology

[0002] In existing technologies, to meet the measurement needs of different application scenarios, traditional electrical measuring instruments typically adopt a full-function design that integrates multiple measurement functions into one unit. This design approach leads to a complex hardware architecture, requiring multiple functional modules and dedicated chips to achieve multi-parameter measurement and processing capabilities. Furthermore, anticipating future functional expansion, traditional electrical measuring instruments usually reserve a certain amount of functional redundancy during the design process to accommodate potential application upgrades. While this design philosophy improves the adaptability and scalability of the product to some extent, it also results in idle hardware resources, increased costs, and decreased system energy efficiency. This multi-functional integrated design is particularly redundant in simple application scenarios where only basic measurement functions are required. Utility Model Content

[0003] In view of this, the embodiments of this application provide a system structure and measuring instrument for a measuring instrument, which can effectively solve the problems of idle hardware resources, increased costs and decreased system energy efficiency caused by the multi-functional integrated design of electrical measuring instruments in the prior art.

[0004] In a first aspect, embodiments of this application provide a system structure for a measuring instrument, including a signal board, a display board, a power supply board, and at least one module board; The signal board is fixedly connected to the display board; The module board is provided with a signal input module or a signal output module, and the module board is movably connected to the power board. The power board is equipped with a power module, and the power board is fixedly connected to the display board. The display panel is equipped with a central processing unit, a display screen electrically connected to the central processing unit, and an input device for receiving input commands.

[0005] In some embodiments, the system structure of the measuring instrument includes two module boards, one of which is provided with the signal input module and the other of which is provided with the signal output module.

[0006] In some embodiments, the module board is provided with pins, and the module board is connected to the connector of the power board through the pins.

[0007] In some embodiments, the display panel is further provided with a backlight driving module and an LED module, the input terminal of the backlight driving module is electrically connected to the central processing unit, and the output terminal of the backlight driving module is electrically connected to the LED module.

[0008] In some embodiments, the display panel is provided with a power detection module and a voltage regulator module; The input terminal of the voltage regulator module is electrically connected to the power supply module, and the output terminal of the voltage regulator module is connected to the power supply terminal of the central processing unit. The input terminal of the power detection module is connected to the input terminal of the voltage regulator module, and the output terminal of the power detection module is electrically connected to the central processing unit.

[0009] In some embodiments, the display panel is provided with a real-time clock module and an energy storage battery. The energy storage battery is electrically connected to the power supply terminal of the real-time clock module, and the real-time clock module is communicatively connected to the central processing unit.

[0010] In some embodiments, the display panel further includes a pulse output module, the input terminal of which is electrically connected to the central processing unit, and the output terminal of which is used to output a pulse signal.

[0011] In some embodiments, the signal board is provided with a metering processing module and a current sampling module and a voltage sampling module that are electrically connected to the metering processing module, respectively, and the output terminal of the metering processing module is electrically connected to the central processing unit.

[0012] In some embodiments, the power board is further provided with a 485 communication module electrically connected to the central processing unit.

[0013] Secondly, embodiments of this application provide a measuring instrument, the measuring instrument including a system structure of at least one measuring instrument as described in the first aspect above.

[0014] The embodiments of this application have the following beneficial effects: The system structure of the measuring instrument of this application includes a signal board, a display board, a power supply board, and at least one module board; the signal board is fixedly connected to the display board; the module board is provided with a signal input module or a signal output module, and the module board is movably connected to the power supply board; the power supply board is provided with a power module, and the power supply board is fixedly connected to the display board; the display board is provided with a central processing unit, a display screen electrically connected to the central processing unit, and an input device for receiving input commands. This application integrates signal processing, power supply, display, and control functions into one unit through modular design. The module board and power supply board are movably connected, allowing for flexible selection according to different specifications, optimizing resource allocation, and reducing hardware costs. Simultaneously, concentrating input / output functions on the module board simplifies the system structure and improves the system's flexibility and adaptability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A circuit diagram illustrating the system structure of the measuring instrument according to an embodiment of this application is shown. Figure 2 A schematic diagram of the system structure of the measuring instrument according to an embodiment of this application is shown; Figure 3 A circuit diagram of the signal input module according to an embodiment of this application is shown; Figure 4 A schematic diagram of the circuit structure of the display panel according to an embodiment of this application is shown; Figure 5 The circuit diagram of the real-time clock module and energy storage module according to an embodiment of this application is shown; Figure 6 A circuit diagram of the pulse output module according to an embodiment of this application is shown.

[0017] Explanation of key component symbols: 10: Signal board; 20: Display board; 21: Display screen; 22: Central processing unit; 23: Input device; 24: Backlight driver module; 25: LED module; 26: Voltage regulator module; 27: Power detection module; 28: Real-time clock module; 29: Energy storage battery; 30: Power board; 31: Power module; 40: Module board; 51: Pulse output module. Detailed Implementation

[0018] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0019] The components of the embodiments of this application described and illustrated in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0020] In the following text, the terms "comprising," "having," and their cognates, which may be used in various embodiments of this application, are intended only to indicate a particular feature, number, step, operation, element, component, or combination thereof, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, or adding the possibility of one or more combinations thereof. Furthermore, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0021] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of this application pertain. Terms (such as those defined in commonly used dictionaries) shall be interpreted as having the same meaning as in their contextual meaning in the relevant technical field and shall not be construed as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of this application.

[0022] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0023] To meet the measurement needs of different application scenarios, programmable electrical measuring instruments typically require multiple functional modules, such as a four-channel digital output module, a four-channel digital input module, and a four-channel analog output module. Furthermore, to support other functions, power supply modules, display modules, etc., are also necessary. For example, a programmable electrical measuring instrument includes four circuit boards: a display board, a signal board, a power supply board, and a function board. The overall structure is relatively complex, resulting in higher manufacturing costs.

[0024] However, in practical applications, users often prefer to configure functional modules as needed, such as requiring only two digital outputs or two analog outputs. Traditional fixed configurations can easily lead to idle hardware resources, increased costs, and decreased system energy efficiency.

[0025] To address the aforementioned issues, this application provides a system structure and measuring instrument for a measuring instrument, integrating signal processing, power supply, display, and control functions into one unit. Through the movable connection between module board 40 and power board 30, flexible selection of functional modules is achieved to meet different specification requirements, improve resource utilization efficiency, and reduce hardware costs. Simultaneously, by centralizing input / output functions on module board 40, the system structure is further simplified, enhancing system flexibility and adaptability.

[0026] The system structure of this measuring instrument will be described below with reference to some specific embodiments.

[0027] Figure 1 A circuit diagram illustrating the system structure of a measuring instrument according to an embodiment of this application is shown. Figure 2 A schematic diagram of the system structure of a measuring instrument according to an embodiment of this application is shown. The system structure of the measuring instrument of this application includes a signal board 10, a display board 20, a power supply board 30, and at least one module board 40.

[0028] The signal board 10 is fixedly connected to the display board 20 and is used to collect measurement data and transmit the measurement data to the display board 20. Exemplarily, the signal board 10 and the display board 20 are fixed by welding. Specifically, a current sampling module or a voltage sampling module can be set on the signal board 10. Exemplarily, the signal board 10 is equipped with a current sampling module, a voltage sampling module, and a metering processing module. The input terminal of the current sampling module is connected to an external circuit for measuring the current signal of the external circuit, and the output terminal of the current sampling module is connected to the first input terminal of the metering processing module. The input terminal of the voltage sampling module is connected to an external circuit for measuring the voltage signal of the external circuit, and the output terminal of the voltage sampling module is connected to the second input terminal of the metering processing module. The output terminal of the metering processing module is electrically connected to the central processing unit 22 on the display board 20. The metering processing module is used to sample and calculate the current signal and / or voltage signal to obtain electrical parameters such as power, energy, and frequency, and transmit the electrical parameters to the central processing unit 22.

[0029] Understandably, current sampling modules, voltage sampling modules, and metering processing modules can be configured according to actual application requirements. For example, the metering processing module is a metering chip. The current and voltage sampling modules can contain any number of sampling units; for instance, the current sampling module can have three current sampling units to achieve simultaneous acquisition of multiple current signals. In the voltage sampling unit, voltage signal reduction can be achieved by setting voltage divider resistors, while in the current sampling unit, a current transformer can be used to both acquire current signals and provide electrical isolation, thereby protecting the metering processing module.

[0030] By integrating the current sampling module, voltage sampling module, and metering processing module onto the signal board 10 and achieving a stable connection with the display board 20, the integration and reliability of the measurement system are improved. The multi-sampling unit design enables simultaneous acquisition of multiple electrical signals, enhancing the flexibility and applicability of the measurement. Simultaneously, the use of a resistor-based voltage reduction and transformer-based isolation structure in the sampling unit ensures measurement accuracy and enhances system safety, effectively protecting the backend metering chip from damage by high voltage or high current, thus improving the overall stability and lifespan of the device.

[0031] The module board 40 is equipped with a signal input module or a signal output module, and is movably connected to the power board 30. It is used to acquire input signals or generate output signals. Exemplarily, the module board 40 is equipped with pins, which are used to connect to the connectors of the power board 30, thus achieving a movable connection. It is understood that the number of module boards can be set according to the actual application; for example, two module boards 40 can be set, one with a signal input module and the other with a signal output module.

[0032] By setting signal input or signal output modules on module board 40 and connecting module board 40 to power board 30 using a pin-and-plug connection, a modular design for signal acquisition or output functions is achieved. This structure not only facilitates the rapid installation, disassembly, and replacement of module board 40, significantly improving equipment maintenance efficiency and expandability, but also supports flexible configuration of multiple module boards 40 according to actual application needs. For example, independent signal input and signal output modules can be set up separately to achieve functional separation and specialized processing, thereby improving system integration and operational reliability. At the same time, the movable connection method reduces production assembly difficulty and maintenance costs, enhances product versatility and customizability, and is suitable for signal processing needs in various complex application scenarios.

[0033] Specifically, the signal output module can be an analog output module or a digital output module, and the signal input module can be an analog input module or a digital output module. The number of input units in each input module and the number of output units in each output module can be set according to the actual application to realize the input or output of multiple signals. For example, Figure 3 The diagram shows a circuit diagram of a signal input module according to an embodiment of this application. The signal input module is a switch input module, wherein two input units are formed by two optocoupler chips U1 and U2. Each input unit generates a high-level signal 1 or a low-level signal 0 by detecting the on / off state of the external circuit.

[0034] Specifically, the signal output module can be either an analog output module or a digital output module, and the signal input module can be either an analog input module or a digital input module. The number of input units in each input module and the number of output units in each output module can be set according to the actual application to achieve multiple signal inputs or outputs. For example, Figure 3 The diagram illustrates a circuit diagram of a signal input module according to an embodiment of this application. The signal input module is a digital input module, wherein two optocoupler chips U1 and U2 form two input units. Each input unit generates a high-level signal 1 or a low-level signal 0 by detecting the on / off state of an external circuit. Exemplarily, the signal output module is formed by two analog output units connected in parallel. The central processing unit 22 outputs a pulse signal, which is converted into a DC signal by the filtering subunit of the analog output unit and then converted into an analog signal by the VI conversion subunit.

[0035] The power board 30 can be equipped with only one connector corresponding to the plug, allowing users to select the appropriate module board 40 to plug into the power board 30 according to their actual application. Alternatively, the power board 30 can be equipped with multiple connectors corresponding to the plug, with each module board 40 connected to one connector. This allows multiple module boards 40 to simultaneously control input and output, achieving parallel control and functional expansion of input and output functions. This facilitates rapid configuration and adjustment according to actual application needs, meeting diverse control requirements under different operating conditions.

[0036] A power supply module 31 is mounted on the power supply board 30. The power supply board 30 is fixedly connected to the display board 20. Exemplarily, the power supply board 30 and the display board 20 are fixed by welding, achieving structural integration and stable electrical connection between power supply and display control. The power supply board 30 provides stable and reliable power signals to various circuit modules of the system structure, such as the metering processing module and the central controller, through the power supply module 31, ensuring the normal operation of the entire device.

[0037] Furthermore, the power board 30 is also equipped with a 485 communication module electrically connected to the central processing unit 22 on the display board 20. Through this 485 communication module, the device can transmit the collected electrical parameters (such as power, energy, voltage, current, etc.) or control signals to an external control system or host computer, and simultaneously receive external commands to achieve remote monitoring and management. This realizes efficient and stable data communication between the system and external devices, enhances the system's intelligence level and communication expansion capabilities, and also improves its compatibility and practicality in complex application scenarios such as industrial automation and power monitoring.

[0038] The display panel 20 includes a central processing unit 22, a display screen 21 electrically connected to the central processing unit 22, and an input device 23 for receiving input commands. Exemplarily, the central processing unit 22 is an MCU. The display screen 21 can be configured according to the actual application; for example, it can be configured as a black-on-white display or a white-on-black display. By configuring the central processing unit 22, the display screen 21, and the input device 23 on the display panel 20, a control interface integrating information display, data processing, and user interaction is constructed, improving the system's ease of operation and human-computer interaction efficiency.

[0039] The input device 23 is used to receive user commands. The input device 23 can be a button. In other implementations, the input device 23 can also be a display screen 21. The user can directly input the corresponding commands through the display screen 21, which enhances the intelligence level of the device and the user's operating experience.

[0040] The central processing unit 22 is used to control the measuring instrument according to the instructions of the input device 23, realizing intelligent operation and parameter configuration of the measurement process, and displaying the measurement data on the display screen 21, thereby improving the convenience and accuracy of data reading.

[0041] In one embodiment, based on the above embodiments, Figure 4A schematic diagram of the circuit structure of the display panel 20 according to an embodiment of this application is shown. The display panel 20 is also provided with a backlight driving module 24 and an LED module 25. The input terminal of the backlight driving module 24 is electrically connected to the central processing unit 22, and the output terminal of the backlight driving module 24 is electrically connected to the LED module 25. Exemplarily, the backlight driving module 24 is a switching transistor, and the central processing unit 22 controls the LED module 25 to provide a backlight signal to the display screen 21 through the switching transistor. Furthermore, if the central processing unit 22 does not receive any operation command from the input device 23 for a preset time, in order to prevent the display screen 21 from entering a black screen state and causing the user to mistakenly believe that the device is powered off, the central processing unit 22 will control the switching transistor to turn on, causing the LED module 25 to generate a dim illumination signal, thereby maintaining a certain backlight indicator. This preset time can be flexibly set according to the actual application scenario to meet the usage needs of different users or devices.

[0042] By incorporating a backlight driver module 24 and an LED module 25 controlled by a central processing unit 22 within the display panel 20, intelligent control of the backlight status of the display screen 21 is achieved. Specifically, when the user has not operated the system for an extended period, the system will not directly turn off the backlight but will adjust it to a low-brightness state, effectively preventing user confusion due to misinterpreting a power outage. This solution not only enhances the user experience but also addresses energy-saving requirements, demonstrating excellent human-computer interaction design and intelligent control logic.

[0043] Furthermore, the display panel 20 is equipped with a power detection module 27 and a voltage regulator module 26. The input terminal of the voltage regulator module 26 is electrically connected to the power module 31, and the output terminal of the voltage regulator module 26 is connected to the power supply terminal of the central processing unit 22. The voltage regulator module 26 is used to regulate the voltage signal from the power module 31 and provide a stable operating voltage for the central processing unit 22. The input terminal of the power detection module 27 is connected to the input terminal of the voltage regulator module 26, and the output terminal of the power detection module 27 is electrically connected to the central processing unit 22, so that the central processing unit 22 can detect the voltage signal at the input terminal of the voltage regulator module 26 in real time. When the detected voltage signal is lower than the set threshold, the central processing unit 22 can promptly trigger the data saving mechanism to back up the key power metering data, thereby achieving high-precision and high-reliability power metering and management.

[0044] By introducing a voltage regulator module 26 and a power detection module 27, the power supply quality of the central processing unit 22 is optimized and its power status is monitored in real time. The voltage regulator module 26 ensures that the central processing unit 22 operates reliably under a stable voltage, improving system stability; while the power detection module 27 enables the central processing unit 22 to detect abnormal input voltage in a timely manner, quickly save critical electrical energy data before power failure or power outage, prevent data loss, and improve the safety and reliability of the electricity metering system.

[0045] Furthermore, the display panel 20 is equipped with a real-time clock module 28 and an energy storage battery 29. The energy storage battery 29 is electrically connected to the power supply terminal of the real-time clock module 28 to ensure continuous power supply to the real-time clock module 28 when the main power supply is interrupted, thus ensuring the continuity of time information. The real-time clock module 28 is communicatively connected to the central processing unit 22 for transmitting time information and performing time calibration. As another embodiment, the real-time clock module 28 can be integrated into the central processing unit 22. Exemplarily, the real-time clock module 28 is a real-time clock with automatic temperature compensation, which can dynamically correct frequency drift caused by temperature changes, thereby maintaining high-precision time measurement throughout the entire operating temperature range.

[0046] Specifically, the real-time clock module 28 generates stable oscillations by driving a quartz crystal, which generates precise pulses through a frequency divider circuit. The internal counter accumulates these pulses to record time information such as seconds, minutes, hours, days, months, and years. When the power module 31 is powered, the clock is powered by the power module 31. When the power module 31 is powered off, the clock automatically switches to the energy storage battery 29 for power supply, thereby ensuring the continuous maintenance of time information in the event of a power outage.

[0047] Exemplary, the real-time clock module 28 via The module communicates with the main control MCU via a C or SPI interface to read, set, and calibrate the time, further ensuring the accuracy of the system time. Simultaneously, the module features a temperature compensation algorithm that corrects frequency offsets caused by temperature in real time, maintaining high-precision timing across the entire operating temperature range. This provides a reliable time reference for electrical measuring instruments, ensuring the accurate implementation of functions such as energy metering, event logging, and system synchronization.

[0048] Furthermore, such as Figure 5 As shown, the energy storage battery 29 is G1, the real-time clock module 28 is U60, and the central processing unit 22 is connected to the energy storage battery 29 through resistors R82, R83, and R85 to collect battery voltage and estimate its remaining capacity. When the central processing unit 22 determines that the capacity of the energy storage battery 29 is lower than a set threshold, it generates an alarm signal through the display screen 21 to remind the user to replace or charge it in time, thereby avoiding clock interruption or data loss due to insufficient battery power.

[0049] Furthermore, the display panel 20 also includes a pulse output module 51, the input terminal of which is electrically connected to the central processing unit 22, and the output terminal of which is used to output pulse signals.

[0050] Exemplary, the pulse output module 51 is as follows Figure 6As shown, it includes three control channels. The central processing unit 22 drives the corresponding transistors to control the LEDs in the optocoupler U215 to emit light, thereby turning on the phototransistors and ultimately generating corresponding pulse signals at the output terminal. The pulse signals are represented by EP+ and EP-. The optocoupler not only achieves electrical isolation but also has good anti-interference capability and reliability, making it suitable for various application scenarios that require precise pulse output.

[0051] This application also provides a measuring instrument, exemplary of which includes the system structure of the measuring instrument described above.

[0052] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that, in alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0053] In addition, the functional modules or units in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0054] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a smartphone, personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.

[0055] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A system structure for a measuring instrument, characterized in that, Includes a signal board, a display board, a power board, and at least one module board; The signal board is fixedly connected to the display board; The module board is provided with a signal input module or a signal output module, and the module board is movably connected to the power board. The power board is equipped with a power module, and the power board is fixedly connected to the display board. The display panel is equipped with a central processing unit, a display screen electrically connected to the central processing unit, and an input device for receiving input commands.

2. The system structure of the measuring instrument according to claim 1, characterized in that, The system structure of the measuring instrument includes two module boards, one of which is equipped with the signal input module and the other of which is equipped with the signal output module.

3. The system structure of the measuring instrument according to claim 1, characterized in that, The module board is provided with pins, and the module board is connected to the connector of the power board through the pins.

4. The system structure of the measuring instrument according to claim 1, characterized in that, The display panel is also provided with a backlight driving module and an LED module. The input terminal of the backlight driving module is electrically connected to the central processing unit, and the output terminal of the backlight driving module is electrically connected to the LED module.

5. The system structure of the measuring instrument according to claim 1, characterized in that, The display panel is equipped with a power detection module and a voltage regulator module; The input terminal of the voltage regulator module is electrically connected to the power supply module, and the output terminal of the voltage regulator module is connected to the power supply terminal of the central processing unit. The input terminal of the power detection module is connected to the input terminal of the voltage regulator module, and the output terminal of the power detection module is electrically connected to the central processing unit.

6. The system structure of the measuring instrument according to claim 1, characterized in that, The display panel is equipped with a real-time clock module and an energy storage battery. The energy storage battery is electrically connected to the power supply terminal of the real-time clock module, and the real-time clock module is communicatively connected to the central processing unit.

7. The system structure of the measuring instrument according to claim 1, characterized in that, The display panel also includes a pulse output module, the input terminal of which is electrically connected to the central processing unit, and the output terminal of which is used to output pulse signals.

8. The system structure of the measuring instrument according to claim 1, characterized in that, The signal board is equipped with a metering processing module and a current sampling module and a voltage sampling module that are electrically connected to the metering processing module, respectively. The output terminal of the metering processing module is electrically connected to the central processing unit.

9. The system structure of the measuring instrument according to claim 1, characterized in that, The power board is also equipped with a 485 communication module that is electrically connected to the central processing unit.

10. A measuring instrument, characterized in that, The measuring instrument includes the system structure of the measuring instrument as described in any one of claims 1-9.

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