Wireless point searching or point testing test system and method based on common ground of power grid

Abstract

The invention relates to a wireless point searching or point measuring test system and method based on power grid common ground, and belongs to the field of wire harness test or electronic component measurement, the system comprises an instrument and a handheld device, the instrument comprises a central processor, a display, a wireless communication module, a level detection module, a current sampling module and a channel module, the handheld device comprises a central processing unit, a displayer, a wireless communication module, a voltage sampling module, a voltage generating module and a positive and negative meter pen. According to the invention, a test meter is not required to be directly connected to an instrument interface, the space constraint of point searching or point measurement is eliminated, the operation of a user is more flexible and convenient, and a test result can be obtained more quickly.

Description

Technical Field

[0001] The invention belongs to the field of wire harness testing or electronic component measurement, and in particular relates to a wireless point-finding or point-measuring test system and a test method based on a common ground of a power grid. Background Art

[0002] In multi-channel harness safety measuring instruments, many users face many channels and need to quickly determine which pin the channel they are using is, or quickly measure the resistance of the device under test on a certain channel. At this time, the user needs to use the point-finding or point-testing function of the instrument. The principle of point-finding is that the instrument applies a test level to the point-finding probe, and the point-finding probe contacts the pin that the user wants to view, so that the instrument forms a circuit loop through the probe and the pin. The instrument uses this to determine which pin the user is viewing at this time, and gives the user the pin name or serial number on the display. The test schematic diagram is as follows: Figure 1 The dotted line part, the point test principle is that the instrument applies a test level to the point test pen, and the point test pen contacts the device under test that the user wants to test, so that the instrument forms a test loop with the device under test through the pen, samples its current and voltage, calculates the resistance of the device under test, and gives the user the resistance value on the display. The test schematic diagram is as follows Figure 1 Solid line part. In traditional instruments, the point-finding or point-testing probe is physically connected to the instrument directly. In some cases, the channel cable can reach ten meters or even dozens of meters, while the point-finding or point-testing probe is generally only 1.5 meters to 3 meters long. The test distance will be limited by the cable length, and it is also necessary to bypass possible space obstacles. At the same time, if the test point or the device under test is on the sides or back of the instrument, the user cannot view the test results in time and needs to go around the front of the instrument to view or need a second person to report the results. Summary of the invention

[0003] The purpose of the present invention is to provide a wireless point-finding or point-testing test system and test method based on a common ground of a power grid, which realizes that there is no need for a test probe to be directly connected to an instrument interface, gets rid of the spatial constraints of point-finding or point-testing, and allows users to operate more flexibly and conveniently, and obtain test results more quickly.

[0004] The present invention provides a wireless point-finding or point-testing system based on a common ground of a power grid, including an instrument and a handheld device;

[0005] The instrument comprises a central processing unit, a display, a wireless communication module, a level detection module, a current sampling module and a channel module, wherein the display, the wireless communication module and the level detection module are connected to the central processing unit, the current sampling module is connected to the level detection module, and the channel module is connected to the current sampling module;

[0006] The handheld device includes a central processing unit, a display, a wireless communication module, a voltage sampling module, a voltage generating module and positive and negative test leads. The display, wireless communication module, voltage sampling module and voltage generating module are connected to the central processing unit, the voltage sampling module is connected to the voltage generating module, the voltage sampling module is connected to the ground network through the negative test lead, and the voltage generating module is connected to the channel module through the positive test lead.

[0007] Preferably, the wireless communication module is a Bluetooth, cellular network module or a WIFI wireless network module.

[0008] Preferably, the positive probe signal flows through the channel point and enters the channel module during wireless point finding, and the positive probe signal flows through the device under test and enters the channel module during point measurement testing.

[0009] The present invention also provides a wireless point finding or point measurement test method based on a common ground of a power grid, using the wireless point finding or point measurement test system based on a common ground of a power grid, comprising the following steps:

[0010] (1) When the user performs a point search operation, the voltage generating module of the handheld device generates a voltage signal, and the signal flows through the channel point and enters the channel module of the instrument. Since the handheld device and the instrument share a common ground, the level detection module of the instrument detects the signal and transmits it to the central processor of the instrument. The central processor calculates which specific channel has a signal level, and then displays the channel number with a level signal on the display. At the same time, the number is transmitted to the wireless communication module of the handheld device through the wireless communication module. After the wireless communication module of the handheld device receives the channel number, it transmits the number to the central processor of the handheld device, which displays it on the display. The user can then directly view the found point channel on the handheld device;

[0011] (2) When the user performs a point measurement operation, the handheld device generates a voltage signal through the voltage generating module, and the signal flows through the device under test and enters the channel module of the instrument. Since the handheld device and the instrument share a common ground, the voltage sampling module of the handheld device can sample the voltage value at both ends of the device under test, and then transmit the voltage value to the central processor of the handheld device; the current detection module of the instrument can detect the current value of the level signal flowing through the device under test, and then perform data processing on the central processor of the instrument. After receiving the current value, the central processor of the instrument will obtain the voltage value sampled by the handheld device from the handheld device through the wireless communication module. After receiving the voltage value, the central processor of the instrument will calculate the resistance value of the device under test using Ohm's theorem after correcting the ground offset voltage, and then transmit the resistance value to the handheld device through the wireless transmission module, which is displayed on the display of the handheld device. The user can then directly view the test resistance value on the handheld device.

[0012] The beneficial effects of the present invention are as follows: the present invention realizes that there is no need for the test probe to be directly connected to the instrument interface, and gets rid of the spatial constraints of point finding or point measurement, so that the user can operate more flexibly and conveniently, and can obtain test results more quickly; on the basis of traditional point finding and point measurement, the present invention removes the probe interface on the instrument, adds a wireless communication module, and designs a handheld device, the handheld device has a display screen, positive and negative probes and a wireless communication module, the negative probe of the handheld device is connected to the ground network (the ground network can be the ground shell of other equipment, or the ground interface of a triangular socket, or the ground lead of a shielded device, etc.), the positive probe of the handheld device is connected to the point finding pin or the point measurement device, the instrument can calculate the point finding pin or the resistance of the device under test through sampling calculation and wireless communication with the handheld device to exchange test information, and then transmit the result to the handheld device through wireless communication, and display it on the handheld device display, so that the user can quickly obtain the test result; in this system, the handheld device has no direct connection with the instrument body, is not restricted by cable length, space obstruction, etc., so that the user can operate conveniently and quickly and obtain the test result quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a point-finding or point-testing test system of a wiring harness safety measuring instrument in the prior art;

[0014] Figure 2 It is a structural schematic diagram of the wireless point-finding or point-testing system based on the common ground of the power grid of the present invention;

[0015] Figure 3 It is a schematic diagram of the testing method of the present invention. DETAILED DESCRIPTION

[0016] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0017] like Figure 2 As shown, the present invention provides a wireless point-finding or point-testing system based on a common ground of a power grid, including an instrument and a handheld device;

[0018] The instrument comprises a central processing unit, a display, a wireless communication module, a level detection module, a current sampling module and a channel module, wherein the display, the wireless communication module and the level detection module are connected to the central processing unit, the current sampling module is connected to the level detection module, and the channel module is connected to the current sampling module;

[0019] The handheld device includes a central processing unit, a display, a wireless communication module, a voltage sampling module, a voltage generating module and positive and negative test leads. The display, the wireless communication module, the voltage sampling module and the voltage generating module are connected to the central processing unit, the voltage sampling module is connected to the voltage generating module, the voltage sampling module is connected to the ground network through the negative test lead, and the voltage generating module is connected to the channel module through the positive test lead;

[0020] Among them, the wireless communication module is Bluetooth, cellular network module or WIFI wireless network module, one of the signals of the positive meter pen flows through the channel point and enters the channel module, and the other signal of the positive meter pen flows through the device under test and enters the channel module.

[0021] When testing, combine Figure 3 As shown:

[0022] If the point search function is used, the test point is pin 5. The user uses this system as follows Figure 3 , the handheld device is connected to the dotted part in the figure. The handheld device generates a 5V voltage signal by the voltage generating module. The signal flows through the channel point and enters the channel module of the instrument. Since the handheld device and the instrument share the same ground, the level detection module of the instrument will collect the level information of each pin and feed it back to the central processor of the instrument. The processor calculates that there is a signal level at pin 5, and then the pin number 5 is displayed on the display. At the same time, the number 5 is transmitted to the wireless communication module of the handheld device through the wireless communication module. After the wireless communication module of the handheld device receives the channel number, it transmits the number 5 to the central processor of the handheld device, which is displayed on the display by the central processor. The user can directly see on the handheld device that the point found at this time is pin 5;

[0023] If the user performs a point test, the resistance to be tested is 1kΩ. Figure 3As shown in the figure, the handheld device probe is connected to the solid line part in the figure, and the handheld device generates a 4V voltage signal by the voltage generating module. The signal flows through the device under test and enters the instrument channel module. Since the handheld device and the instrument share a common ground, the voltage sampling module of the handheld device samples the voltage difference between the device under test and the earth as 4.21V, and then transmits the voltage value to the central processor of the handheld device; the current detection module of the instrument detects that the current value of the 4V voltage signal flowing through the device under test is 3.996mA, and then transmits the sampled value of 3.996mA to the central processor of the instrument for data processing. The central processor of the instrument receives the voltage and sends it to the central processor of the instrument. After the current value is measured, the 4.21V voltage value sampled by the handheld device is obtained from the handheld device through the wireless communication module. The instrument calculates that the compensation of the negative terminal of the device under test to the ground is -0.2V. After the ground offset voltage is corrected, the voltage across the device under test is 4.01V. The Ohm's theorem (resistance = voltage / current) is used to calculate the resistance of the device under test to be (4.01V / 3.996mA) 1.004kΩ. The resistance value is then transmitted to the handheld device through the wireless transmission module and displayed on the display of the handheld device. The user can directly view the test resistance on the handheld device as 1.004kΩ.

[0024] For the above two operations, the handheld device does not need to be directly connected to the instrument through a cable. The negative test lead only needs to be connected to the grounding network nearby. The grounding network can be the ground wire interface of the extension board, the grounding shell of other instruments, or the grounding wire of the shielding tooling. In this way, the instrument does not need to provide a cable for point finding or point measurement. The user is not limited by the length of the channel cable or the influence of space barriers, and can directly view the test results through the handheld device.

[0025] Finally, it should be noted that the above embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A wireless point search or point measurement test system based on a common ground of a power grid, characterized in that: Including instruments and handheld devices; The instrument comprises a central processing unit, a display, a wireless communication module, a level detection module, a current sampling module and a channel module, wherein the display, the wireless communication module and the level detection module are connected to the central processing unit, the current sampling module is connected to the level detection module, and the channel module is connected to the current sampling module; The handheld device includes a central processing unit, a display, a wireless communication module, a voltage sampling module, a voltage generating module and positive and negative test leads. The display, wireless communication module, voltage sampling module and voltage generating module are connected to the central processing unit, the voltage sampling module is connected to the voltage generating module, the voltage sampling module is connected to the ground network through the negative test lead, and the voltage generating module is connected to the channel module through the positive test lead.

2. The wireless point finding or point measurement test system based on power grid common ground according to claim 1 is characterized in that: The wireless communication module is a Bluetooth, cellular network module or a WIFI wireless network module.

3. The wireless point finding or point measurement test system based on power grid common ground according to claim 1 is characterized in that: The positive meter probe signal flows through the channel point position into the channel module during wireless point search, and the positive meter probe signal flows through the device under test into the channel module during point measurement test.

4. A wireless point finding or point measurement test method based on a common ground of a power grid, using a wireless point finding or point measurement test system based on a common ground of a power grid as claimed in any one of claims 1 to 3, characterized in that: The steps include: (1) When the user performs a point search operation, the handheld device generates a voltage signal through the voltage generating module, and the signal flows through the channel point and enters the channel module of the instrument. The level detection module of the instrument detects the signal and transmits it to the central processor of the instrument. The central processor calculates which specific channel has a signal level, and then displays the channel number with the level signal on the display. At the same time, the number is transmitted to the wireless communication module of the handheld device through the wireless communication module. After the wireless communication module of the handheld device receives the channel number, it transmits the number to the central processor of the handheld device, which displays it on the display. The user can then directly view the found point channel on the handheld device; (2) When the user performs a point measurement operation, the handheld device generates a voltage signal through the voltage generating module, and the signal flows through the device under test and enters the channel module of the instrument. The voltage sampling module of the handheld device can sample the voltage value at both ends of the device under test, and then transmit the voltage value to the central processor of the handheld device; the current detection module of the instrument can detect the current value of the level signal flowing through the device under test, and then perform data processing on the central processor of the instrument. After receiving the current value, the central processor of the instrument will obtain the voltage value sampled by the handheld device from the handheld device through the wireless communication module. After receiving the voltage value, the central processor of the instrument will calculate the resistance value of the device under test using Ohm's theorem after correcting the ground offset voltage, and then transmit the resistance value to the handheld device through the wireless transmission module, which is displayed on the display of the handheld device. The user can then directly view the test resistance size on the handheld device.

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