Electrostatic high-resistance measuring instrument calibration device and method combined with industrial Internet of Things technology

Abstract

The invention relates to the technical field of electronic measurement and instruments, in particular to an electrostatic high-resistance measuring instrument calibration device and method combined with the industrial Internet of Things technology, and the device comprises a single-chip microcomputer, a constant current source, an A / D converter, a signal conditioning circuit and a display circuit, the constant current source is electrically connected with the single-chip microcomputer, the single-chip microcomputer controls the working state of the constant current source, and the A / D converter is electrically connected with the single-chip microcomputer. The output end of the A / D converter is electrically connected with the data input end of the single-chip microcomputer, the input end of the A / D converter is electrically connected with the output end of the signal conditioning circuit, and the display circuit is electrically connected with the single-chip microcomputer, so that the accuracy and efficiency of calibration are improved, and the flexibility and expandability of the system are enhanced; and an efficient, reliable, economical and practical solution is provided for the user.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic measurement and instruments, and more particularly, to a calibration device and method for an electrostatic high-resistance measuring instrument combined with industrial Internet of Things technology. Background Art

[0002] With the development of electronic technology, resistance measurement has become increasingly important in various industrial and scientific research fields. Especially in the field of high-resistance measurement, accurate resistance values are crucial for ensuring product quality and performance. Traditional resistance measurement methods often rely on manual operation, which is not only inefficient but also easily affected by the skill level of operators, resulting in inaccurate and unstable measurement results. To improve the accuracy and efficiency of resistance measurement, people have started to research and develop automated resistance measuring instruments. These instruments usually use a constant current source to provide a stable test current and read the voltage value through a high-precision A / D converter to calculate the resistance value. However, even these advanced devices need to be calibrated regularly to ensure their measurement accuracy. During the calibration process, environmental factors such as temperature, humidity, and electromagnetic interference may affect the calibration results. In addition, the calibration process itself may also introduce errors, such as measurement errors caused by poor contact of connecting wires and interfaces. Therefore, it is particularly important to develop a calibration device and method that can automatically detect and compensate for these errors. Summary of the Invention

[0003] In view of this, the present invention aims at the deficiencies of the prior art and provides a calibration device and method for an electrostatic high-resistance measuring instrument combined with industrial Internet of Things technology, aiming to solve at least one of the problems raised in the above background art.

[0004] In a first aspect

[0005] The present invention provides a calibration device for an electrostatic high-resistance measuring instrument combined with industrial Internet of Things technology, comprising: a single-chip microcomputer;

[0006] A constant current source, electrically connected between the constant current source and the single-chip microcomputer, and the single-chip microcomputer controls the working state of the constant current source;

[0007] An A / D converter, the output end of the A / D converter is electrically connected to the data input end of the single-chip microcomputer;

[0008] A signal conditioning circuit, the input end of the A / D converter is electrically connected to the output end of the signal conditioning circuit;

[0009] A display circuit, electrically connected between the display circuit and the single-chip microcomputer.

[0010] In some embodiments, the single-chip microcomputer controls the working state of the constant current source through an I / O port.

[0011] In some embodiments, the output terminal of the constant current source is electrically connected to both ends of the resistor under test.

[0012] In some embodiments, the voltage detection terminal of the resistor under test is electrically connected to the A / D converter.

[0013] In some embodiments, the output terminal of the signal conditioning circuit is electrically connected to the data input terminal of the single-chip microcomputer.

[0014] In some embodiments, the single-chip microcomputer controls the working state and display content of the display screen through the I / O port, and the display screen is an LCD display screen.

[0015] In some embodiments, data transmission between the single-chip microcomputer and the host computer is realized through the RS232 serial port.

[0016] Second aspect

[0017] The present invention provides a calibration method for an electrostatic high-resistance measuring instrument combined with industrial Internet of Things technology, including the following steps:

[0018] S1. Ensure that all connection wires and interfaces are firm, monitor the working environment temperature and humidity in real time, ensure that there is no electromagnetic field affecting the measurement around, check whether the appearance of the measuring instrument is damaged or abnormal, check whether the LCD display screen works normally and the display content is clear, and clear the previous residual data before starting the measurement;

[0019] S2. Condition the signal through a programmable gain amplifier circuit and a programmable filter circuit, use the A / D converter to read the voltage value, the single-chip microcomputer reads the output value of the A / D converter, and calculates the resistance value according to a preset algorithm, and set the alarm threshold of the resistance value to 10 9 Ω to 10 16 Ω. When the measured value exceeds the preset range, trigger an alarm, and record various data during the calibration process, including the readings before and after calibration, adjustment values, and calibration time;

[0020] S3. After the calibration is completed, verify the measuring instrument with a resistor or component of known resistance value.

[0021] In some embodiments, the real-time monitoring of the working environment temperature and humidity in step S1 includes ensuring that the ambient temperature is 23 ± 5°C and the humidity is 40% - 60%.

[0022] In some embodiments, the conditioning of the signal through the programmable gain amplifier circuit and the programmable filter circuit in step S2 includes ensuring that the input voltage of the A / D converter is within the range of 0 - 2V.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: By adopting a high-performance constant current source, it ensures a stable test current under various load conditions, reducing measurement errors caused by current fluctuations. By eliminating the influence of contact resistance and lead resistance, more accurate resistance value measurement is achieved. Using a low-speed and high-precision A / D converter to read voltage values ensures the accuracy and stability of the data. Automatically determines whether to increase or decrease the range according to the voltage value of the current range, without manual adjustment, improving work efficiency. Automatically clears the previous residual data before starting the measurement, ensuring that each measurement starts from zero and avoiding cumulative errors. Users can select different current modes and speed modes according to their needs to meet the requirements of different application scenarios. By effectively controlling factors such as temperature, humidity, and electromagnetic interference, the influence of the external environment on the calibration results is reduced. Connecting the resistance measuring instrument to the Internet enables remote monitoring and control, facilitating managers to understand the device status at any time and make necessary adjustments. Using big data analysis and artificial intelligence algorithms to deeply analyze the calibration data, potential problems are discovered and early warnings are given. All data during the calibration process will be recorded in detail, including readings before and after calibration, adjustment values, calibration time, etc., for subsequent reference and traceability. Transmitting the data to the central database through the network for storage is convenient for centralized management and analysis. Users can set the alarm threshold of the resistance value according to the actual situation. When the measured value exceeds the preset range, the system will automatically trigger an alarm. Sending alarm information to the user through sound, light, etc. to ensure timely measures are taken.

[0024] The above general description and the following detailed description are exemplary and explanatory only and do not limit the present disclosure.

[0025] Other features and aspects of the present disclosure will become clearer from the following detailed description of exemplary embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is a structural block diagram of an electrostatic high-resistance measuring instrument calibration device and its method combining industrial Internet of Things technology provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0029] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application.

[0030] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "plurality" is two or more.

[0031] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected" and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0032] As described in the background art, with the development of electronic technology, resistance measurement has become increasingly important in various industrial and scientific research fields. Especially in the field of high-resistance measurement, accurate resistance values are crucial for ensuring product quality and performance. Traditional resistance measurement methods often rely on manual operations, which are not only inefficient but also easily affected by the skill level of operators, resulting in inaccurate and unstable measurement results. To improve the accuracy and efficiency of resistance measurement, people have started to research and develop automated resistance measurement instruments. These instruments usually use a constant current source to provide a stable test current and read the voltage value through a high-precision A / D converter to calculate the resistance value. However, even these advanced devices need to be calibrated regularly to ensure their measurement accuracy. During the calibration process, environmental factors such as temperature, humidity, and electromagnetic interference can all affect the calibration results. In addition, the calibration process itself may also introduce errors, such as measurement errors caused by poor contact of connecting wires and interfaces. Therefore, it is particularly important to develop a calibration device and method that can automatically detect and compensate for these errors.

[0033] To address the above issues, a calibration device and method for an electrostatic high-resistance measuring instrument combining industrial Internet of Things technology proposed in this application uses a high-performance constant current source to ensure a stable test current under various load conditions and reduce measurement errors caused by current fluctuations. By eliminating the influence of contact resistance and lead resistance, more accurate resistance value measurement is achieved. A low-speed high-precision A / D converter is used to read the voltage value to ensure the accuracy and stability of the data. Automatically judge whether to increase or decrease the gear according to the voltage value of the current range without manual adjustment, improving work efficiency. Automatically clear the previous residual data before starting the measurement to ensure that each measurement starts from zero and avoid cumulative errors. Users can select different current modes and speed modes according to their needs to meet the requirements of different application scenarios. By effectively controlling factors such as temperature, humidity, and electromagnetic interference, the influence of the external environment on the calibration results is reduced. Connect the resistance measuring instrument to the Internet to achieve remote monitoring and control, facilitating managers to understand the device status at any time and make necessary adjustments. Use big data analysis and artificial intelligence algorithms to deeply analyze the calibration data, discover potential problems and give early warnings. All data during the calibration process will be recorded in detail, including readings before and after calibration, adjustment values, calibration time, etc., for easy subsequent reference and traceability. Transmit the data to the central database through the network for storage, facilitating centralized management and analysis. Users can set the alarm threshold of the resistance value according to the actual situation. When the measured value exceeds the preset range, the system will automatically trigger an alarm. Send alarm information to the user through sound, light, etc. to ensure timely measures are taken.

[0034] Refer to Figure 1As shown in the first embodiment, a calibration device for an electrostatic high-resistance measuring instrument integrating industrial Internet of Things technology according to an embodiment of the present application includes:

[0035] A single-chip microcomputer;

[0036] A constant current source, electrically connected between the constant current source and the single-chip microcomputer, and the single-chip microcomputer controls the working state of the constant current source;

[0037] An A / D converter, the output end of the A / D converter is electrically connected to the data input end of the single-chip microcomputer;

[0038] A signal conditioning circuit, the input end of the A / D converter is electrically connected to the output end of the signal conditioning circuit;

[0039] A display circuit, electrically connected between the display circuit and the single-chip microcomputer.

[0040] By using a constant current source and a high-precision A / D converter, the device can provide more accurate and stable current, thereby improving the calibration accuracy of the electrostatic high-resistance measuring instrument. The single-chip microcomputer controls the entire calibration process, making the operation more convenient, reducing the possibility of human error, and improving the calibration efficiency. Combining industrial Internet of Things technology, the device can remotely transmit data, realize remote monitoring and data analysis of the calibration process, and facilitate remote operation and management by users. The device can record all data during the calibration process, which is convenient for subsequent analysis and quality control, and at the same time provides data traceability. Due to the use of single-chip microcomputer control, the device can be adjusted and optimized according to real-time data to ensure that the calibration process is always in the best state. In the calibration process involving high voltage or high current, the automated device can reduce the risk of direct contact by operators and improve the safety of the working environment.

[0041] In some specific embodiments, the single-chip microcomputer controls the working state of the constant current source through an I / O port.

[0042] The single-chip microcomputer can accurately control the magnitude and stability of the output current, avoiding distortion and loss in the process of analog signal transmission, thereby improving the control accuracy of the constant current source. Using a single-chip microcomputer instead of a traditional analog control chip can reduce the number of peripheral components of the control circuit, simplify the circuit design, and reduce the complexity and weight of the system. The single-chip microcomputer has high integration and reliability, and can reduce the risk of system failure caused by component aging or failure. The single-chip microcomputer can implement various complex control logics and functions through programming, such as current limiting, voltage regulation, etc., improving the intelligent level of the system. Combining industrial Internet of Things technology, the single-chip microcomputer can realize remote transmission and monitoring of data, facilitating remote operation and management by users. The single-chip microcomputer can quickly adjust and optimize according to the real-time monitored data to ensure that the system is always in the best working state and improve the energy utilization efficiency.

[0043] In some specific embodiments, the output terminal of the constant current source is electrically connected to both ends of the resistor under test.

[0044] In some specific embodiments, the voltage detection terminal of the resistor under test is electrically connected to the A / D converter.

[0045] Directly electrically connecting the voltage detection terminal of the resistor under test to the A / D converter simplifies the circuit design. It reduces intermediate links, lowers the complexity of the system, and improves reliability and stability. Through the direct electrical connection, attenuation and interference during signal transmission are reduced, improving the accuracy of voltage detection. This is particularly important for high-precision resistance measurement, ensuring the accuracy of measurement results. The direct electrical connection enables the system to monitor the voltage change of the resistor under test in real time and quickly feedback it to the control unit. This real-time property helps to timely adjust the working state of the constant current source and maintain the optimal performance of the system. The additional signal conditioning circuit is eliminated, reducing the power consumption and cost of the system. This is particularly important for portable or low-power application scenarios, helping to extend the service life of the device and the battery life. The direct electrical connection method enhances the compatibility of the system, facilitating the cooperation with different types of A / D converters and constant current sources. This flexibility makes the system more adaptable to different application requirements and technological updates.

[0046] In some specific embodiments, the output terminal of the signal conditioning circuit is electrically connected to the data input terminal of the single-chip microcomputer.

[0047] In some specific embodiments, the single-chip microcomputer controls the working state and display content of the display screen through the I / O port, and the display screen is an LCD display screen.

[0048] The signal conditioning circuit can amplify, filter and process the signal to be measured, making the signal more stable and accurate. This is particularly important for high-precision resistance measurement, ensuring the accuracy of the measurement results. The signal conditioning circuit combined with the microcontroller can achieve real-time monitoring of the voltage of the resistance to be measured and quickly feedback it to the control unit. This real-time property helps to adjust the working state of the constant current source in a timely manner and maintain the best performance of the system. Omitting the additional signal conditioning circuit reduces the power consumption and cost of the system. This is particularly important for portable or low-power application scenarios, helping to extend the service life of the device and the battery life. The direct electrical connection method enhances the compatibility of the system and facilitates cooperation with different types of A / D converters and constant current sources. This flexibility makes the system more adaptable to different application requirements and technological updates. The microcontroller can quickly adjust and optimize according to the real-time monitored data to ensure that the system is always in the best working state and improve the energy utilization efficiency. Due to the high integration and mass production characteristics of the microcontroller, the manufacturing cost of the system can be reduced, making the constant current source based on the microcontroller more competitive in price. The software of the microcontroller control system can be functionally upgraded or maintained through simple program updates, improving the maintainability of the system.

[0049] In some specific embodiments, data transmission between the microcontroller and the host computer is realized through the RS232 serial port.

[0050] RS232 serial port communication can achieve real-time data transmission between the microcontroller and the host computer. Through the serial interface, data can be quickly and stably transmitted between the two, which is suitable for application scenarios that require immediate feedback. The RS232 serial port supports remote monitoring and control functions. Users can remotely operate the microcontroller through the host computer, obtain the device status in real time and conduct control, improving the intelligent level and management efficiency of the system. The RS232 serial port has wide compatibility and can be seamlessly connected to a variety of devices and systems. This compatibility makes RS232 a commonly used communication interface standard in the fields of industrial control and automation. The RS232 serial port has strong anti-interference ability and can work stably in a complex electromagnetic environment. This enables it to maintain reliable communication performance under harsh conditions such as industrial sites and ensures the accuracy of data transmission.

[0051] For microcontroller programming, write initialization code to set the working mode and parameters of the microcontroller. Write the automatic range switching logic to determine whether to increase or decrease the gear according to the voltage value of the current range. Write the zeroing function code to clear the previous residual data before starting the measurement. Write the current mode setting code to allow users to select different current modes for measurement. Write the speed mode setting code to allow users to select different data acquisition speeds. Write the comparator setting code to set the alarm threshold.

[0052] The host computer program is designed using the C++ language and is responsible for communicating with the resistance measuring instrument and processing data. Design the RS232 serial communication protocol to achieve data transmission with the PC. Write a data acquisition thread to regularly obtain data from the single-chip microcomputer and store it in the buffer. Write a data analysis thread to process and analyze the collected data. Design a user interface to provide an intuitive operation method and result display.

[0053] The second embodiment

[0054] A method for calibrating an electrostatic high-resistance measuring instrument combined with industrial Internet of Things technology according to an embodiment of the present application includes the following steps:

[0055] S1. Ensure that all connection lines and interfaces are firm, monitor the working environment temperature and humidity in real time, ensure that there is no electromagnetic field affecting the measurement around, check whether the appearance of the measuring instrument is damaged or abnormal, check whether the LCD display screen is working properly and the display content is clear, and clear the previous residual data before starting the measurement;

[0056] S2. Condition the signal through a programmable gain amplifier circuit and a programmable filter circuit, use an A / D converter to read the voltage value, the single-chip microcomputer reads the output value of the A / D converter, and calculates the resistance value according to a preset algorithm, and set the alarm threshold of the resistance value to 10 9 Ω to 10 16 Ω. When the measured value exceeds the preset range, trigger an alarm and record various data during the calibration process, including the readings before and after calibration, adjustment values, and calibration time;

[0057] S3. After the calibration is completed, verify the measuring instrument using a resistor or component with a known resistance value.

[0058] In some specific embodiments, the real-time monitoring of the working environment temperature and humidity in step S1 includes ensuring that the environmental temperature is 23 ± 5°C and the humidity is 40% - 60%.

[0059] In some specific embodiments, the conditioning of the signal through a programmable gain amplifier circuit and a programmable filter circuit in step S2 includes ensuring that the input voltage of the A / D converter is within the range of 0 - 2V.

[0060] Ensuring that the working environment temperature is 23±5°C and the humidity is 40% - 60% can effectively reduce measurement errors and improve calibration accuracy. By monitoring these environmental parameters in real time, the stability and reliability of the measurement process are ensured. The signal is conditioned through a programmable gain amplifier circuit and a programmable filter circuit to ensure that the input voltage of the A / D converter is within the range of 0 - 2V, which helps to improve the accuracy and stability of signal processing and reduce the influence of external interference. The single-chip microcomputer reads the output value of the A / D converter, calculates the resistance value according to the preset algorithm, and records various data during the calibration process, including the readings before and after calibration, the adjustment value, and the calibration time. These data are helpful for subsequent analysis and quality traceability. Set the alarm threshold for the resistance value, trigger an alarm when the measured value exceeds the preset range, and timely remind the operator to take measures to prevent equipment damage or measurement errors caused by abnormal measurements and improve the system safety. After calibration, use a resistor or component with a known resistance value to verify the measuring instrument to ensure the accuracy and consistency of its measurement results. This step is an important link in the calibration process and ensures the reliability and stability of the measuring instrument.

[0061] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these changes and modifications.

Claims

1. A calibration device for electrostatic high resistance measuring instrument combined with industrial Internet of Things technology, characterized in that: include: Single chip microcomputer; A constant current source, the constant current source is electrically connected to the single chip microcomputer, and the single chip microcomputer controls the working state of the constant current source; An A / D converter, wherein an output terminal of the A / D converter is electrically connected to a data input terminal of the single chip microcomputer; a signal conditioning circuit, wherein the input end of the A / D converter is electrically connected to the output end of the signal conditioning circuit; A display circuit is electrically connected to the single chip microcomputer.

2. According to claim 1, a calibration device for electrostatic high resistance measuring instrument combined with industrial Internet of Things technology is characterized in that: The single chip microcomputer controls the working state of the constant current source through the I / O port.

3. According to the electrostatic high resistance measuring instrument calibration device combined with industrial Internet of Things technology in claim 1, it is characterized in that: The output end of the constant current source is electrically connected to the two ends of the resistor to be measured.

4. According to claim 3, a calibration device for electrostatic high resistance measuring instrument combined with industrial Internet of Things technology is characterized in that: The voltage detection end of the resistor to be measured is electrically connected to the A / D converter.

5. The electrostatic high resistance measuring instrument calibration device combined with industrial Internet of Things technology according to claim 1 is characterized in that: The output end of the signal conditioning circuit is electrically connected to the data input end of the single chip microcomputer.

6. The electrostatic high resistance measuring instrument calibration device combined with industrial Internet of Things technology according to claim 1 is characterized in that: The single chip microcomputer controls the working state and display content of the display screen through the I / O port, and the display screen is an LCD display screen.

7. The electrostatic high resistance measuring instrument calibration device combined with industrial Internet of Things technology according to claim 1 is characterized in that: The data transmission between the single chip microcomputer and the host computer is realized through the RS232 serial port.

8. The electrostatic high resistance measuring instrument calibration method combined with industrial Internet of Things technology according to claim 1 is characterized in that: A calibration device for an electrostatic high resistance measuring instrument combined with industrial Internet of Things technology as described in any one of claims 1 to 7 comprises the following steps: S1. Ensure that all connecting wires and interfaces are firm, monitor the working environment temperature and humidity in real time, ensure that there is no electromagnetic field around that may affect the measurement, check whether the appearance of the measuring instrument is damaged or abnormal, check whether the LCD display is working properly and whether the displayed content is clear, and clear the previous residual data before starting the measurement; S2, condition the signal through the program-controlled amplifier circuit and the program-controlled filter circuit, use the A / D converter to read the voltage value, the microcontroller reads the output value of the A / D converter, and calculates the resistance value according to the preset algorithm, and sets the alarm threshold of the resistance value 10 9 Ω~10 16 Ω, trigger an alarm when the measured value exceeds the preset range, and record various data during the calibration process, including readings before and after calibration, adjustment values, and calibration time; S3. After calibration is completed, use resistors or components with known resistance values ​​to verify the measuring instrument.

9. The electrostatic high resistance measuring instrument calibration method combined with industrial Internet of Things technology according to claim 8 is characterized in that: The real-time monitoring of the working environment temperature and humidity in step S1 includes ensuring that the environment temperature is 23±5° C. and the humidity is 40% to 60%.

10. The electrostatic high resistance measuring instrument calibration method combined with industrial Internet of Things technology according to claim 8 is characterized in that: The step S2 includes conditioning the signal by the program-controlled amplifier circuit and the program-controlled filter circuit to ensure that the input voltage of the A / D converter is within the range of 0 to 2V.

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