An on-line calibration device for an ESD on-line monitoring system monitor

Abstract

The utility model relates to electronic equipment protection technical field, concretely is a kind of on-line verification device of monitor of ESD on-line monitoring system, it includes host computer and several monitors, host computer is connected with each monitor by communication network communication, test circuit is respectively arranged in each monitor, precision resistance and electronic switch are connected in test circuit, precision resistance is the precision resistance with multiple gear positions, the gear position of precision resistance can be adjusted by electronic switch, test circuit can detect the resistance value of loop resistance, and compare detection value with check threshold value, judge whether monitor check is qualified, and send the judgment result to host computer, if check is unqualified, host computer sends information to maintenance end, and prompts maintenance personnel to monitor and calibrate.The utility model can carry out on-line verification to monitor, avoid the influence of monitor dismounting to production, improve check efficiency, reduce check cost, and guarantee the reliability of monitoring system operation.

Description

Technical Field

[0001] This utility model relates to the field of electronic equipment protection technology, and in particular to an online verification device for an ESD online monitoring system. Background Technology

[0002] ESD (Electrostatic Discharge) is the generation of static electricity through the contact, separation, or friction between different substances. For some static-sensitive components, especially electronic components, ESD can easily lead to performance changes and failure. Therefore, static eliminators are used in production environments to eliminate static electricity and ensure product performance and quality. However, prolonged use of static eliminators can lead to performance failure. If performance fails, it can transform from a static eliminator into a static source, harming product manufacturing. Therefore, in the electronics manufacturing industry, ESD monitoring systems are crucial equipment for ensuring that the production environment meets electrostatic control standards. ESD monitoring systems use monitors to monitor the performance of static eliminators. The monitor needs to continuously detect the grounding loop resistance of the equipment to confirm whether the grounding wire is aging or has poor contact, ensuring that static electricity is effectively conducted to the ground. If the monitor malfunctions during use, the reliability of the monitoring results will decrease. Therefore, the monitor needs to be calibrated periodically. Currently, there are two main methods for calibrating monitors. The first method is to remove the monitor from the field and send it to a third-party metrology institution for verification. After passing the verification, it is reinstalled. This process is time-consuming and may affect production. The second method is for personnel in the factory's calibration laboratory to bring measuring instruments to the production site to calibrate each monitoring instrument. This method is also time-consuming and may cause production interruptions when there are a large number of monitoring instruments. Therefore, it is necessary to improve the calibration method for the monitoring instruments. Utility Model Content

[0003] The purpose of this invention is to solve the problem that the calibration method of the monitor in the existing ESD monitoring system is time-consuming and may affect production, and to provide an online calibration method for the monitor in the ESD online monitoring system.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] An online verification method for an ESD online monitoring system monitor includes a host computer and several monitors, wherein the host computer and each monitor are connected via a communication network.

[0006] Each monitor is equipped with a test circuit, which is connected to a precision resistor and an electronic switch. The precision resistor has multiple ranges, and the range can be adjusted by the electronic switch. The test circuit can detect the resistance value of the loop resistance, compare the detected value with the verification threshold, determine whether the monitor is qualified, and send the judgment result to the host computer.

[0007] The host computer is equipped with a calibration control circuit for the monitoring instruments. The calibration control circuit is connected to the electrical signals of each monitoring instrument. The calibration control circuit can send signals to the monitoring instruments to make the test circuit of the corresponding monitoring instruments conduct and detect the resistance value of the loop resistance. The host computer is also connected to the maintenance terminal. If the calibration is qualified, the calibration ends. If the calibration fails, the host computer sends information to the maintenance terminal to prompt the maintenance personnel to adjust the monitoring instruments.

[0008] In the above scheme, each monitor is equipped with an interrupt control circuit. After the verification control circuit in the host computer sends a signal to the monitor, the interrupt control circuit can control the conduction of the test circuit and detect the resistance value of the loop resistance. By setting the interrupt control circuit, the working state of the monitor can be switched, and the monitor can be switched between monitoring state and verification state online. For example, when the monitor needs to be verified, it can be switched to verification state, and after the verification is successful, the monitor can be switched back to monitoring state.

[0009] In the above scheme, the precision resistor is a precision resistor with an error of less than 1%. This setting enables the monitoring instrument to achieve higher calibration accuracy.

[0010] In the above scheme, the precision resistor range includes 35MΩ, 0.75MΩ, 1Ω, and 4Ω. This setting allows for calibration across multiple resistance ranges, improving calibration accuracy.

[0011] In the above scheme, the verification threshold is ±10% of the resistance value of the corresponding range of the precision resistor. This setting ensures that the verification threshold meets the verification requirements and accurately determines whether the monitor's verification is qualified.

[0012] It should be noted that the online calibration device of the ESD online monitoring system of this utility model requires the following steps: After the test circuit in the monitoring instrument completes the tests on the loop current and voltage to ground, it needs to calculate the resistance value and compare it with the calibration threshold. Both the calculation and comparison of this resistance value require corresponding programs, which can be implemented using existing technologies. A calibration control circuit is provided in the host computer. The purpose of the calibration control circuit is to send calibration commands to the monitoring instrument that needs to be calibrated, causing the interrupt control circuit in the monitoring instrument to switch the monitoring instrument to the test state for calibration. After the calibration is completed, if the calibration result is unqualified, information needs to be sent to the maintenance terminal to prompt maintenance personnel to adjust the unqualified monitoring instrument. Therefore, the host computer also needs to have built-in programs, which can also be implemented using existing technologies. Therefore, this utility model meets the protection requirements of a utility model.

[0013] This invention offers several advantages: Firstly, the online calibration device for the ESD online monitoring system can perform online calibration of the monitoring instrument without removing it from the production line and sending it to a calibration agency, thus avoiding the impact of disassembly and reassembly on production. Secondly, the automated calibration process significantly shortens calibration time and improves efficiency. Thirdly, it reduces the number of times the instrument needs to be sent to a third-party metrology agency for calibration, thereby lowering calibration costs. Fourthly, the host computer can monitor the status of the monitoring instrument in real time, promptly identify and address problems, and ensure the reliability of the monitoring system. Attached Figure Description

[0014] Figure 1 This is a structural block diagram of the online verification device of the monitoring instrument in the ESD online monitoring system of this utility model.

[0015] Figure 2 This is a flowchart illustrating the online verification method for the monitoring instrument of the ESD online monitoring system of this utility model.

[0016] The attached diagram is labeled as follows: host computer 1, monitor 2, precision resistor 3, electronic switch 4, test circuit 5, interrupt control circuit 6. Detailed Implementation

[0017] The technical solution of this utility model will be clearly and completely described below through embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] like Figure 1As shown, the online verification device of the monitoring instrument of the ESD online monitoring system of this utility model includes a host computer 1 and several monitoring instruments 2. The host computer 1 and each monitoring instrument 2 are connected to each other through a communication network.

[0019] Each monitor 2 is equipped with a test circuit 5. The test circuit 5 can detect the resistance value of the loop resistance, compare the detected value with the verification threshold, determine whether the monitor is qualified, and send the judgment result to the host computer 1.

[0020] A precision resistor 3 and an electronic switch 4 are connected in the test circuit 5.

[0021] The precision resistor 3 serves as the standard component for calibration. The smaller the error value, the higher the calibration accuracy of the monitor 2. The precision resistor 3 can be a precision resistor with an error of less than 1%. For example, if the resistance value of the precision resistor 3 is 100MΩ, then the error value is ±1MΩ, that is, the resistance value of the precision resistor 3 should be between 99 MΩ and 101 MΩ.

[0022] Precision resistor 3 can be either an external resistor or an internal resistor. An external resistor can be a resistor box or resistor enclosure, and it is connected to the calibration port of the monitor via two wires.

[0023] The built-in resistor is a standard resistor set in the test circuit inside the monitor 2.

[0024] Electronic switch 4 is a selector switch located in test circuit 5. It allows setting the range of precision resistor 3. The built-in precision resistor 3 has ranges of 35MΩ, 0.75MΩ, 1Ω, and 4Ω.

[0025] The verification threshold is ±10% of the resistance value of the corresponding range of Precision Resistor 3. For example, if the range of Precision Resistor 3 is selected as 0.75MΩ / 35MΩ, the measured value should also be within 0.75MΩ ±10% / 35MΩ ±10%. If the measurement result is within the verification threshold range, it is judged as qualified; otherwise, it is judged as unqualified.

[0026] Each monitor 2 is equipped with an interrupt control circuit 6, which controls the conduction of the test circuit and detects the resistance value of the loop resistance. By setting the interrupt control circuit 6, the working state of the monitor 2 can be switched, and the monitor 2 can be switched between monitoring state and calibration state online. For example, when the monitor 2 needs to be calibrated, it can be switched to calibration state, and after the calibration is passed, the monitor 2 can be switched back to monitoring state.

[0027] The host computer 1 contains a verification control circuit for the monitors 2. This circuit is electrically connected to each monitor 2. The verification control circuit sends signals to each monitor 2, causing the corresponding monitor's interrupt control circuit 6 to control the test circuit 5 to conduct, thus detecting the resistance value of the loop resistance. The host computer 1 is also electrically connected to the maintenance terminal 7. If the verification is successful, the verification process ends; if it fails, the host computer sends information to the maintenance terminal 7, prompting maintenance personnel to calibrate the monitors.

[0028] like Figure 2 As shown, the online verification method for the monitoring instrument of the ESD online monitoring system of this utility model includes the following steps:

[0029] S1. The host computer sends verification commands to the monitoring instruments that need to be verified online. The verification of the monitoring instruments can be designed as needed. For example, the monitoring instruments need to be verified at certain time intervals when they are working. Therefore, the host computer can control the verification of multiple monitoring instruments. When the working time of the monitoring instrument reaches the preset time interval, the host computer can send a verification command to the monitoring instrument.

[0030] S2. After receiving the verification command, the interrupt control circuit switches the monitor's state to test state. The test circuit is turned on, and the precision resistor is switched to the corresponding range through the electronic switch. The test circuit performs numerical tests to detect the loop current and voltage to ground, and calculates the resistance value. The resistance value is the voltage to ground divided by the loop current. The test results are stored locally on the monitor.

[0031] S3. The monitor determines whether the monitor is qualified based on the preset verification threshold. If the resistance value obtained by the test is within the verification threshold range of the precision resistor setting, it is determined to be qualified. If the resistance value obtained is not within the verification threshold range of the precision resistor setting, it is determined to be unqualified.

[0032] For example, if the precision resistor is set to 35MΩ, then the verification threshold is 35MΩ ± 10%, which is 32 MΩ-38MΩ. If the measured resistance value is 31 MΩ, it is outside the verification threshold range and is judged as unqualified. If the measured resistance value is 33 MΩ, it is within the verification threshold range and is judged as qualified.

[0033] S4. The monitor uploads the test results and judgment results to the host computer, which is responsible for displaying the calibration results and data. The host computer sends the information of the monitor that fails the calibration to the maintenance terminal, reminding the maintenance personnel to adjust the monitor that fails the calibration.

[0034] If any of the monitoring devices are not powered on or have a disconnected network, the host computer will display a pop-up window showing the uncalibrated machine code based on the unanswered information. Maintenance personnel can then use the machine code to identify the uncalibrated device, power it on, or connect it to the network for verification.

[0035] S5. Maintenance personnel shall adjust the unqualified monitors. After adjustment, the monitors shall be recalibrated according to the above steps S1-S4 and the calibration results shall be recorded. If the calibration is qualified, the calibration of the monitor shall be ended. If the calibration is still unqualified, the adjustment and calibration shall be repeated until the monitors are qualified.

[0036] This invention discloses an online calibration method for ESD online monitoring system instruments. This method enables online calibration of the ESD online monitoring system instruments, avoiding the impact of disassembly and reassembly on production. The automated calibration process significantly shortens calibration time and improves efficiency. If the online calibration is successful, the instrument does not need to be disassembled; only instruments that fail calibration require disassembly and adjustment. This reduces the number of times the instrument needs to be sent to a third-party metrology institution for calibration, lowering calibration costs. The host computer can monitor the instrument's status in real time, promptly identify and address problems, ensuring the reliability of the monitoring system.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An online verification device for a monitoring instrument in an ESD online monitoring system, characterized in that: It includes a host computer and several monitoring instruments, and the host computer and each monitoring instrument are connected to each other through a communication network; Each monitor is equipped with a test circuit, which is connected to a precision resistor and an electronic switch. The precision resistor has multiple ranges, and the range can be adjusted by the electronic switch. The test circuit can detect the resistance value of the loop resistance, compare the detected value with the verification threshold, determine whether the monitor is qualified, and send the judgment result to the host computer. The host computer is equipped with a calibration control circuit for the monitoring instruments. The calibration control circuit is connected to the electrical signals of each monitoring instrument. The calibration control circuit can send signals to the monitoring instruments to make the test circuit of the corresponding monitoring instruments conduct and detect the resistance value of the loop resistance. The host computer is also connected to the maintenance terminal. If the calibration is qualified, the calibration ends. If the calibration fails, the host computer sends information to the maintenance terminal to prompt the maintenance personnel to adjust the monitoring instruments.

2. The online verification device for the monitoring instrument of the ESD online monitoring system according to claim 1, characterized in that: Each monitor is equipped with an interrupt control circuit. After the verification control circuit in the host computer sends a signal to the monitor, the interrupt control circuit can control the conduction of the test circuit and detect the resistance value of the loop resistance.

3. The online verification device for the monitoring instrument of the ESD online monitoring system according to claim 1, characterized in that: The precision resistor is a precision resistor with an error of less than 1%.

4. The online verification device for the monitoring instrument of the ESD online monitoring system according to claim 1, characterized in that: The precision resistors are available in 35MΩ, 0.75MΩ, 1Ω, and 4Ω ranges.

5. The online verification device for the monitoring instrument of the ESD online monitoring system according to claim 1, characterized in that: The verification threshold is ±10% of the resistance value of the corresponding range of the precision resistor.

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