Device for measuring impedance of grounding point

Abstract

A device for measuring impedance of a grounding point comprises a shell, a printed circuit board, a display screen, a battery, an alarm assembly, a test port connector female seat and a test cable connector male head, the printed circuit board and the battery are arranged in the shell, the display screen is embedded in the shell, and the alarm assembly is arranged in the shell. The alarm assembly, the display screen and the test port connector female seat are connected with the printed circuit board, and the test port connector female seat is in plugging cooperation with the test cable connector male head. And the test cable connector male head is also connected to a plurality of grounding points of the to-be-tested equipment through a cable, and the multi-path aviation plug male head and the multi-path aviation plug female head which are matched with each other in a plugging manner, so as to measure the impedance of the plurality of grounding points of the to-be-tested equipment. The device for measuring the impedance of the grounding point can measure the impedance of multiple paths of grounding points at the same time, and does not need to embed a grounding rod. Meanwhile, the battery is used for supplying power without an external power supply. According to the utility model, impedance measurement is more convenient, so that the production safety of equipment to be measured is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of additive manufacturing, and particularly relates to a device for measuring the impedance of a grounding point. Background Art

[0002] When industrial equipment is in use, it generally needs to be grounded to discharge charges. However, if the grounding is poor and the charges cannot be discharged in time, the charge accumulation is likely to damage the electronic components of the equipment or even cause the equipment to be scrapped. Therefore, it is very necessary to detect the grounding impedance of the equipment. Ideally, the impedance of each grounding point on the equipment to the ground is zero. However, in actual applications, due to various conditions, the impedance of each grounding point to the ground will not be zero. The existing grounding detectors are complex to operate and require grounding rods to be buried. When burying grounding rods, due to site conditions, there are often situations where there is no space to set the grounding rod or the grounding is still poor even if the grounding rod is set. Moreover, generally, a grounding detector can only test one point. If multiple points need to be measured, multiple measurements are required, which takes a long time and requires multiple connections of the grounding rod, consuming a long time and making it difficult to measure the grounding impedance of multiple points simultaneously. Summary of the Utility Model

[0003] In order to solve the above technical problems existing in the prior art, the utility model provides a device for measuring the impedance of a grounding point, which can measure the grounding impedance of multiple points of industrial equipment simultaneously and is easy to operate.

[0004] To achieve the above object, the utility model provides a device for measuring the impedance of a grounding point, which is used to measure the impedance of the grounding point of a device to be measured. It includes a housing, a printed circuit board, a display screen, a battery, an alarm component, a female socket of a test port connector, and a male plug of a test cable. The printed circuit board and the battery are arranged in the housing, the display screen is arranged on the housing, the alarm component is arranged on the printed circuit board, the alarm component, the display screen, and the female socket of the test port connector are connected to the printed circuit board. The female socket of the test port connector is in plug-in fit with the male plug of the test cable. The male plug of the test cable is also connected to multiple grounding points of the device to be measured through a cable and a male multi-way aviation plug and a female multi-way aviation plug in plug-in fit, so as to measure the grounding impedance of multiple grounding points of the device to be measured.

[0005] As a further preferred scheme of the utility model, the male plug of the test cable is connected to the male multi-way aviation plug through multiple cables. The female multi-way aviation plug in plug-in fit with the male multi-way aviation plug is connected to multiple grounding points of the device to be measured through multiple cables. The female multi-way aviation plug is also welded with a cable for connecting the grounding wire of the device to be measured.

[0006] As a further preferred embodiment of the present utility model, 16 test cables and 1 common COM port cable are led out from the male connector of the test cable and welded to the male connector of the multi-way aviation plug.

[0007] As a further preferred embodiment of the present utility model, a current generation module, an analog data acquisition module, and a data processing module are provided on the printed circuit board. A power switch is further provided on the housing for controlling the on / off of the current generation module. The analog data acquisition module is connected to the data processing module, and the data processing module is connected to the display screen and the alarm component.

[0008] As a further preferred embodiment of the present utility model, the housing includes a front housing and a rear housing. The printed circuit board and the battery are arranged on the rear housing. The power switch is embedded in the top of the rear housing. The display screen is embedded in the front housing. The alarm component is embedded on the printed circuit board.

[0009] As a further preferred embodiment of the present utility model, an observation hole is provided at the top of the rear housing for real-time monitoring of the remaining power of the battery.

[0010] As a further preferred embodiment of the present utility model, the battery is a rechargeable battery and is connected to the printed circuit board through the wiring terminals of the printed circuit board to provide electrical energy for the entire device.

[0011] As a further preferred embodiment of the present utility model, the alarm component is composed of a plurality of alarm LED lamp beads, and the plurality of alarm LED lamp beads are arranged in a row and evenly spaced.

[0012] As a further preferred embodiment of the present utility model, the device to be tested is an additive manufacturing device.

[0013] The device for measuring the ground point impedance of the present utility model includes a housing, a printed circuit board, a display screen, a battery, an alarm component, a female connector of the test port, and a male connector of the test cable. The printed circuit board and the battery are arranged in the housing. The display screen is arranged on the housing. The alarm component is arranged on the printed circuit board. The alarm component, the display screen, and the female connector of the test port are connected to the printed circuit board. The female connector of the test port is in plug-in fit with the male connector of the test cable. The male connector of the test cable is also connected to multiple ground points of the device to be tested through a cable and a plug-in fit male connector and female connector of the multi-way aviation plug to measure the ground point impedance of multiple ground points of the device to be tested, so that the device for measuring the ground point impedance of the present utility model can measure the ground point impedance of multiple paths simultaneously and does not require burying a ground rod. At the same time, a battery is used for power supply without an external power source. Therefore, the present utility model makes the impedance measurement more convenient and improves the safety of the production of the device to be tested. Description of the Drawings

[0014] Figure 1 External structure diagram of an embodiment provided for the device for measuring the ground point impedance of the present utility model;

[0015] Figure 2 Internal structure diagram of an embodiment provided for the device for measuring the ground point impedance of the present utility model;

[0016] Figure 3 Test connection cable diagram between the device for measuring the ground point impedance of the present utility model and the device under test;

[0017] Figure 4 Wiring diagram of the device under test;

[0018] Figure 5 Circuit diagram of the current generation module in the device for measuring the ground point impedance of the present utility model;

[0019] Figure 6 Circuit diagram of the analog data acquisition module in the device for measuring the ground point impedance of the present utility model.

[0020] Component markings in the figure are as follows:

[0021] 1. Housing, 2. Display screen, 3. Alarm LED lamp bead, 4. Female socket of the test port connector, 5. Power switch, 6. Data processing module, 7. Battery, 8. Printed circuit board, 9. Observation hole, 10. Male plug of the test cable, 11. Male plug of the multi-way aviation plug, 12. Female plug of the multi-way aviation plug, 13. Device under test. Specific implementation manners

[0022] In order to enable those skilled in the art to better understand and implement the technical solution of the present utility model, the following will further elaborate in detail with reference to the specification drawings and specific embodiments.

[0023] The device for measuring the ground point impedance of the present utility model is used to measure the ground point impedance of the device under test 13, such as Figure 1 and Figure 2As shown in the figure, it includes a housing 1, a printed circuit board 8, a display screen 2, a battery 7, an alarm component, a test port connector female socket 4, and a test cable connector male head 10. The printed circuit board 8 and the battery 7 are arranged inside the housing 1. The display screen 2 is arranged on the housing 1. The alarm component is arranged on the printed circuit board. The alarm component, the display screen 2, and the test port connector female socket 4 are connected to the printed circuit board 8. The test port connector female socket 4 is plugged and matched with the test cable connector male head 10. The test cable connector male head 10 is also connected to multiple grounding points of the device under test 13 through a cable and a plugged and matched multi-way aviation plug male head 11 and multi-way aviation plug female head 12 to measure the impedance of multiple grounding points of the device under test 13.

[0024] Specifically, the test cable connector male head 10 is connected to the multi-way aviation plug male head 11 through multiple cables. The multi-way aviation plug female head 12 plugged and matched with the multi-way aviation plug male head 11 is connected to multiple grounding points of the device under test 13 through multiple cables. The multi-way aviation plug female head 12 is also welded with a cable for connecting the ground wire of the device under test 13.

[0025] As Figure 3 shown, the test cable connector male head 10 leads out 16 test cables and 1 common com port cable and welds them to the multi-way aviation plug male head 11. Of course, in specific implementation, the specific number of cables is set according to requirements and is not limited here.

[0026] The printed circuit board 8 is provided with a current generation module, an analog data acquisition module, and a data processing module 6. The housing 1 is also provided with a power switch 5 for controlling the opening or closing of the current generation module. The analog data acquisition module is connected to the data processing module 6. The data processing module 6 is connected to the display screen 2 and the alarm component.

[0027] As an implementation manner of the present utility model, the housing 1 includes a front shell and a rear shell. The printed circuit board 8 and the battery 7 are arranged on the rear shell. The power switch 5 is embedded in the top of the rear shell. The display screen 2 is embedded in the front shell. The alarm component is embedded in the printed circuit board 8. Of course, in specific implementation, the housing 1 can also be an integral structure with a cavity in the middle for installing the above-mentioned printed circuit board 8, display screen 2, battery 7, alarm component, test port connector female socket 4, test cable connector male head 10, etc.

[0028] As Figure 2 shown, an observation hole 9 is opened at the top of the rear shell for real-time monitoring of the remaining power of the battery 7 to ensure overall battery life by charging in time when the power is insufficient.

[0029] The battery 7 is a plurality of rechargeable batteries, which are connected in series to the printed circuit board 8 through the terminals of the printed circuit board 8 to provide electrical energy for the entire device (such as the display screen 2, the alarm component, the data processing module 6, etc.).

[0030] Further referring to Figure 1 and Figure 2 , the alarm component is composed of several alarm LED beads 3, and several alarm LED beads 3 are arranged in a row and evenly spaced.

[0031] The device to be tested 13 is an additive manufacturing device, and of course it can also be any other device to be tested that needs to measure the impedance of the grounding point.

[0032] As Figure 4 shown, assume that the device to be tested for impedance 13 can be divided into 4 parts (respectively A, B, C, D), and each part has 4 points where the impedance needs to be detected, with a total of 16 points where the impedance to the ground needs to be measured. A cable is pre-set for each part of the device to connect to the ground. Cables are reserved and numbered 1 - 16 at each point in advance, and the cables 1 - 16 are welded to the female multi-way aviation plug 12. A wire is also welded to the female multi-way aviation plug 12 to connect to the ground wire of the device to be tested 13.

[0033] As Figure 3 and Figure 4 shown, in actual use, the female multi-way aviation plug 12 is docked with the male multi-way aviation plug 11, and the male test cable connector 10 is docked with the female test port connector 4 on the printed circuit board 8.

[0034] As Figure 5 shown, the precision current source chip U1 in the current generation module is divided into 2 paths to emit a stable current. The 2 paths of current are combined into 1 to become the reference current I, and then after the high-frequency AC components are filtered out by the inductor L1, it is sent to the resistor in series with the resistor of the impedance to be tested (code name Rtest). At this time, U-out is the sum of R1 and the impedance to be tested multiplied by the current emitted by the current source.

[0035] As Figure 6 shown, the U-0ut voltage of the analog data acquisition module passes through the impedance matching circuit composed of R1 and R2, and then through the further filtering of C10, and is sent to the AD620 voltage amplifier. The resistance values of R3 and R4 can be changed to obtain different voltage amplification factors. The amplified U-0ut flows into the negative voltage of the voltage divider resistor composed of R5 and R6 resistors. The calculation formula for the voltage ADC_OUT1 between the R5 and R6 resistors is:

[0036]

[0037] Let \(G\) be the magnification factor. The calculation method of \(G\) refers to the magnification chip manual. Different magnification chips have different calculation methods for \(G\).

[0038] ADC_OUT1 is directly sent to the analog-to-digital / digital-to-analog conversion circuit (ADC) of the data processing module 6. The ADC circuit converts ADC_OUT1 into a digital quantity that can be directly recognized and processed by a computer. The data processing module 6 filters the digital quantity (the filtering methods include but are not limited to arithmetic mean filtering method, median average filtering method, limit amplitude and anti-vibration filtering method, recursive average filtering method, limit amplitude filtering method, etc.), eliminates abnormal values, and obtains a stable value \(V\). \(V\) is used to inversely deduce the impedance to be measured \(R_{test}\). Its calculation formula is:

[0039]

[0040] The data processing module 6 sends the calculated value of \(R_{test}\) to the display screen 2. The data display module displays the number. At the same time, for a too large resistance value (taking 5 ohms as an example), the data processing module 6 sends an alarm message to the display screen 2 and lights up the corresponding numbered LED lamp bead in the alarm LED lamp beads 3 for reminder.

[0041] During actual use, after pressing the power switch 5, the entire device is powered on. Each current generation module in the 16 channels will generate a stable current of 200 mA. After flowing through a series resistor and the impedance to be measured, a weak millivolt-level voltage is generated. The voltage is amplified by dozens or even thousands of times by the amplification circuit in the analog data acquisition module and then sent to the analog / digital conversion interface (ADC) of the data processing module 6. The data processing module 6 obtains relatively accurate data through a filtering algorithm, and finally displays the impedance value of each of the 16 impedances to be measured on the display screen 2 for the user to observe. At the same time, for the channels whose impedance values exceed the pre-set impedance value, the corresponding lamp beads in the alarm LED lamp beads 3 are lit.

[0042] The above embodiments are only the preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention shall belong to the protection scope of the present invention. It should be noted that several modifications and decorations made without departing from the principle of the present invention shall be regarded as within the protection scope of the present invention.

Claims

1. A device for measuring grounding point impedance, used to measure the grounding point impedance of a device to be tested, characterized in that: The invention comprises a shell, a printed circuit board, a display screen, a battery and an alarm component, a test port connector female socket, and a test cable connector male head. The printed circuit board and the battery are arranged in the shell, the display screen is arranged on the shell, and the alarm component is arranged on the printed circuit board. The alarm component, the display screen and the test port connector female socket are connected to the printed circuit board. The test port connector female socket is plug-matched with the test cable connector male head. The test cable connector male head is also connected to multiple grounding points of a device to be tested through cables and plug-matched multi-way aviation plug male heads and multi-way aviation plug female heads, so as to measure the impedance of multiple grounding points of the device to be tested.

2. The device for measuring ground point impedance according to claim 1, characterized in that: The male head of the test cable connector is connected to the male head of the multi-way aviation plug through multiple cables, and the female head of the multi-way aviation plug that is plugged with the male head of the multi-way aviation plug is connected to multiple grounding points of the device under test through multiple cables. The female head of the multi-way aviation plug is also welded with a cable for connecting the ground wire of the device under test.

3. The device for measuring ground point impedance according to claim 2, characterized in that: The test cable connector male head leads out 16 test cables and 1 common com port cable, which are welded to the multi-way aviation plug male head.

4. The device for measuring ground point impedance according to claim 1, characterized in that: The printed circuit board is provided with a current generating module, an analog data acquisition module and a data processing module. The shell is also provided with a power switch for controlling the opening or closing of the current generating module. The analog data acquisition module is connected to the data processing module, and the data processing module is connected to the display screen and the alarm component.

5. The device for measuring ground point impedance according to claim 4, characterized in that: The housing comprises a front housing and a rear housing, the printed circuit board and the battery are arranged on the rear housing, the power switch is embedded in the top of the rear housing, the display screen is embedded in the front housing, and the alarm component is embedded in the printed circuit board.

6. The device for measuring ground point impedance according to claim 5, characterized in that: An observation hole is provided on the top of the rear shell for real-time monitoring of the remaining power of the battery.

7. The device for measuring ground point impedance according to claim 1, characterized in that: The battery is a rechargeable battery, which is connected to the printed circuit board through the connection terminals of the printed circuit board to provide power for the entire device.

8. The device for measuring ground point impedance according to any one of claims 1 to 7, characterized in that: The alarm component is composed of a plurality of alarm LED lamp beads, and the plurality of alarm LED lamp beads are arranged in a row and evenly spaced.

9. The device for measuring ground point impedance according to claim 8, characterized in that: The device to be tested is an additive manufacturing device.

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