Impedance test device, detection system and equipment

Abstract

The utility model discloses an impedance testing device, a detection system and equipment, and belongs to the technical field of impedance testing. The impedance testing device comprises an impedance testing unit, a power supply and a switch unit, the switch unit comprises a first switch, a second switch and a third switch, the states of the first switch and the second switch are opposite, the states of the second switch and the third switch are the same, and one end of the first switch is connected with the measuring end of the impedance testing unit. One end of the second switch is connected with a first electrode of the power supply, the other end of the first switch and the other end of the second switch are both used for being connected with a function end of the air bag connector, one end of the third switch is connected with a second electrode of the power supply, and the other end of the third switch is used for being connected with a test end of the air bag connector. When the first switch is switched off, the second switch is switched on and the third switch is switched on, on-off of the function end and the test end can be detected, and the technical problem that the on-off of the function end and the corresponding test end cannot be detected in the impedance test in the prior art is solved.

Description

Technical Field

[0001] The present application belongs to the field of impedance testing technology, and specifically relates to an impedance testing device, detection system and equipment. Background Art

[0002] The functional end of the airbag connector primarily connects to the airbag system's wiring harness. This connection ensures the airbag deploys quickly and reliably when needed to protect vehicle occupants. Furthermore, impedance testing is required at the test end of the airbag connector corresponding to the functional end to ensure the performance of the wiring harness connected to the functional end. However, conventional impedance testing cannot detect continuity between the functional end and the corresponding test end. Utility Model Content

[0003] Purpose of the utility model: An embodiment of the present application provides an impedance testing device, which aims to solve the technical problem in the prior art that impedance testing cannot detect the continuity between the functional end and the corresponding test end; another purpose of an embodiment of the present application is to provide a detection system having the above-mentioned impedance testing device; another purpose of an embodiment of the present application is to provide a device having the above-mentioned detection system.

[0004] Technical solution: On the one hand, an embodiment of the present application provides an impedance testing device, which includes: an impedance testing unit, the impedance testing unit including a measuring end; a power supply, the power supply including a first electrode and a second electrode; a switching unit, the switching unit including a first switch, a second switch, and a third switch, the states of the first switch and the second switch are opposite, and the states of the second switch and the third switch are the same, one end of the first switch is connected to the measuring end, one end of the second switch is connected to the first electrode, the other end of the first switch and the other end of the second switch are both used to connect to the functional end of the airbag connector, one end of the third switch is connected to the second electrode, and the other end of the third switch is used to connect to the test end of the airbag connector.

[0005] On the other hand, the present application also provides a detection system, including the above-mentioned impedance testing device.

[0006] On the other hand, the present application also provides a device comprising the above-mentioned detection system.

[0007] Beneficial Effects: Compared with the prior art, the impedance testing device of the embodiment of the present application includes: an impedance testing unit, a power supply, and a switch unit. The impedance testing unit includes a measuring end; the power supply includes a first electrode and a second electrode; the switch unit includes a first switch, a second switch, and a third switch. The first switch and the second switch are in opposite states, while the second switch and the third switch are in the same state. One end of the first switch is connected to the measuring end, one end of the second switch is connected to the first electrode, and the other end of the first switch and the other end of the second switch are both used to connect to the functional end of the airbag connector. One end of the third switch is connected to the second electrode, and the other end of the third switch is used to connect to the test end of the airbag connector. The present application can be used to test the impedance of the airbag connector when the first switch is closed, and can be used to detect the continuity between the functional end and the test end when the first switch is open, the second switch is closed, and the third switch is closed. This solves the technical problem in the prior art that impedance testing cannot detect the continuity between the functional end and the corresponding test end.

[0008] Compared with the prior art, the detection system of the embodiment of the present application includes all the technical features and technical effects of the above-mentioned impedance testing device, which will not be repeated here.

[0009] Compared with the prior art, the device of the embodiment of the present application includes all the technical features and technical effects of the above-mentioned detection system, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0011] Figure 1 A schematic diagram of the overall structure of a wire transmission monitoring device provided in an embodiment of the present application;

[0012] Figure 2 Another structural diagram of the wire transmission monitoring device provided in an embodiment of the present application;

[0013] Figure 3 A schematic structural diagram of a wire transmission monitoring device provided in an embodiment of the present application in a first working state;

[0014] Figure 4 A schematic structural diagram of the wire transmission monitoring device provided in an embodiment of the present application in a second working state;

[0015] Description of reference numerals:

[0016] 10-Airbag connector, 11-Function end, 12-Test end. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0018] In the description of this application, it should be understood that the specific embodiments described herein are only used to illustrate and explain this application and are not used to limit this application. The terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0019] The present application provides an impedance testing device, a detection system, and an apparatus, which are described in detail below. It should be noted that the order in which the following embodiments are described does not limit the preferred order of the embodiments of the present application. In the following embodiments, the description of each embodiment has its own emphasis. For parts not described in detail in a particular embodiment, please refer to the relevant description of other embodiments.

[0020] The applicant noted that, currently, for airbag connector products with the test hole behind the magnet, the functional end of the airbag connector is mainly connected to the wiring harness of the airbag system. This connection ensures that the airbag can be deployed quickly and reliably when needed to protect the safety of vehicle occupants. Impedance testing of airbag connectors is designed to verify the quality of the magnetic material within the airbag connector, thereby ensuring the electrical and shielding properties of the wiring harness connected to the functional end. Furthermore, impedance testing is performed on the test end corresponding to the functional end of the airbag connector to ensure the connector's performance. During the impedance test, under normal circumstances, if there is continuity between the functional end and the corresponding test end, the impedance is low. However, if the impedance test indicates high impedance, it indicates poor magnetic material in the airbag connector, which can affect the connector's performance. However, since the test end is a hole, it can easily be blocked by other materials during processing, potentially disconnecting the functional end from the test end. Therefore, high impedance may be caused by material blocking the test end, while the magnetic material within the airbag connector is intact. Consequently, judging the performance of the airbag connector based solely on the impedance test results can lead to misjudgment. Furthermore, conventional impedance testing cannot detect the continuity between the functional end and the corresponding test end, i.e., it cannot detect the continuity of the test hole.

[0021] In view of this, combined with Figures 1 to 4 , an embodiment of the present application provides an impedance testing device, aiming to overcome the above technical problems.

[0022] See also Figure 1 In some embodiments, the impedance testing device includes: an impedance testing unit T, the impedance testing unit T includes a measuring end; a power supply S, the power supply S includes a first electrode and a second electrode; a switch unit, the switch unit includes a first switch K1, a second switch K2, and a third switch K3, the states of the first switch K1 and the second switch K2 are opposite, and the states of the second switch K2 and the third switch K3 are the same, one end of the first switch K1 is connected to the measuring end, one end of the second switch K2 is connected to the first electrode, the other end of the first switch K1 and the other end of the second switch K2 are both used to connect to the functional end 11 of the airbag connector 10, one end of the third switch K3 is connected to the second electrode, and the other end of the third switch K3 is used to connect to the test end 12 of the airbag connector 10.

[0023] It should be noted that Figure 1The A terminals are integrated, that is, interconnected. The first electrode can be either the positive or negative electrode of the power supply S, and the corresponding second electrode has the opposite limit to the first electrode. In this application, taking the first electrode as the positive electrode of the power supply S and the second electrode as the negative electrode of the power supply S as an example, the first electrode is +24V and the second electrode is 0V. In addition, the states of the first switch K1 and the second switch K2 are opposite, while the states of the second switch K2 and the third switch K3 are the same. Specifically, a relay can be used to achieve circuit switching. Specifically, when the driving end of the relay receives a corresponding electrical signal, it controls the first switch K1 to close, the second switch K2 to open, and the third switch K3 to open. If no corresponding electrical signal is received or the relay is in the power-off state, the first switch K1 is opened, the second switch K2 is closed, and the third switch K3 is closed, thereby achieving circuit switching. This can not only detect the continuity between the functional terminal 11 and the test terminal 12, but also achieve impedance testing of the airbag connector 10.

[0024] Specifically, the exemplary working principle of an impedance testing device provided in this application is as follows:

[0025] In the first working state, the first switch K1 is open, the second switch K2 is closed, and the third switch K3 is closed, so that the first electrode, the second switch K2, the functional terminal 11, the test terminal 12, the third switch K3, and the second electrode form a detection circuit. If the functional terminal 11 and the test terminal 12 are conductive, the detection circuit is conductive; if the functional terminal 11 and the test terminal 12 are not conductive, the detection circuit is not conductive.

[0026] In the second working state, the first switch K1 is closed, the second switch K2 is opened, and the third switch K3 is opened, the detection loop is disconnected, and the impedance testing unit T is connected to the functional terminal 11 to perform impedance testing.

[0027] It should be noted that the first operating state is to detect the continuity between the functional terminal 11 and the test terminal 12, and the second operating state is to perform an impedance test on the airbag connector 10. Furthermore, it should be understood that impedance testing is a method for measuring the impedance of a circuit or device. An AC power source S and a measuring instrument can be used to measure the impedance in a circuit. Furthermore, the impedance testing unit T can be implemented by combining multiple instruments to achieve the purpose of impedance testing, wherein the measuring terminal is used to obtain data parameters corresponding to the impedance test. Furthermore, in this application, the first and second operating states are not prioritized.

[0028] Through the above technical solution, the present application adds a detection power supply S, a loop detection unit, and a detection loop switching switch unit to form a test hole detection loop; the present application can be used to test the impedance between the functional end 11 and the test end 12 when the first switch K1 is closed, the second switch K2 is disconnected, and the third switch K3 is disconnected, and can be used to detect the continuity between the functional end 11 and the test end 12 when the first switch K1 is disconnected, the second switch K2 is closed, and the third switch K3 is closed, thereby solving the technical problem in the prior art that the impedance test cannot detect the continuity between the functional end 11 and the corresponding test end 12. Furthermore, during the impedance test process, if the test does not meet the requirements, it can be further determined whether there is a problem of blockage of other substances in the test end 12 or a problem of the magnetic material inside the airbag connector 10, thereby avoiding misjudgment of detection.

[0029] In some embodiments, the impedance testing device further includes: a detection unit, which is configured to output a first level when the functional terminal 11 and the test terminal 12 are conductive, and the first level is configured to drive the first switch K1 to close, the second switch K2 to open, and the third switch K3 to open.

[0030] Specifically, when the functional terminal 11 and the test terminal 12 are connected, the first electrode and the second electrode of the power supply S are connected, and then the detection unit can detect the electrical signal, thereby outputting the first level to indicate that the detection circuit is connected.

[0031] It should be noted that, in this application, the first level refers to the electrical signal output by the detection unit after conduction between the first electrode and the second electrode of the power supply S. The first level is used to drive the first switch K1 to close, the second switch K2 to open, and the third switch K3 to open, thereby isolating the power supply S in the first and second operating states to prevent mutual interference. Furthermore, the first level serves as one of the criteria for determining whether to drive the first switch K1 to close, the second switch K2 to open, and the third switch K3 to open. In the absence of the first level, the first switch K1, the second switch K2, and the third switch K3 can also be closed or opened according to actual conditions. Similarly, in the presence of the first level, the first switch K1, the second switch K2, and the third switch K3 can also be closed or opened according to actual conditions.

[0032] In some embodiments, the first electrode, the second switch K2, the functional end 11, the test end 12, the third switch K3 and the second electrode form a first detection circuit. The detection unit includes a first end and a second end. The first end is connected to the first detection circuit. When the first detection circuit is turned on, the second end is used to output a first level.

[0033] It should be noted that the detection unit is connected to the first detection circuit to facilitate receiving the electrical signal in the first detection circuit. If the first detection circuit is not conductive, the first end does not receive the electrical signal; if the first detection circuit is conductive, the first end receives the electrical signal in the first detection circuit and outputs it from the second end, indicating that the first detection circuit is conductive.

[0034] Furthermore, in some embodiments, the detection unit is a fifth switch K5 , one end of the fifth switch K5 is used as the first end, and the other end of the fifth switch K5 is used as the second end.

[0035] It should be noted that the fifth switch K5 can be a relay, which is a circuit detection relay, so that the first end is the driving end of the relay and the second end is the output end of the relay. When the first detection circuit is turned on, the electrical signal in the first detection circuit will be transmitted to the driving end, causing the relay to close, thereby outputting an electrical signal, i.e., the first level, from the output end of the relay.

[0036] In some embodiments, the impedance testing device further includes: a control unit C, the control unit C having a first input end and a first output end, the first input end being connected to the second end for receiving a first level, the first output end being configured to output a drive signal when the first input end receives the first level, the drive signal being used to drive the first switch K1 to close, the second switch K2 to open, and the third switch K3 to open.

[0037] It should be noted that the control unit C can be, but is not limited to, a PLC controller, a single-chip microcomputer, or other controller. Receiving the first electrical level indicates that the control unit C has received a signal indicating that the first detection circuit is conducting. Consequently, the first electrical level output by the control unit C can drive the first switch K1 to close, the second switch K2 to open, and the third switch K3 to open. Using the control unit C can better achieve automated control and monitoring of the device. Furthermore, the drive signal serves as one of the criteria for determining whether to drive the first switch K1 to close, the second switch K2 to open, and the third switch K3 to open. In the absence of a drive signal, the first switch K1, the second switch K2, and the third switch K3 can also be closed or opened based on actual conditions. Similarly, in the presence of a drive signal, the first switch K1, the second switch K2, and the third switch K3 can also be closed or opened based on actual conditions.

[0038] See also Figure 2 In some embodiments, when the airbag connector 10 has two functional terminals 11 and two test terminals 12 corresponding one-to-one to the functional terminals 11, the switch unit further includes a fourth switch K4. The fourth switch K4 and the third switch K3 have the same state. One end of the fourth switch K4 is connected to the first electrode, the other end of the second switch K2 and the other end of the fourth switch K4 are respectively connected to the two functional terminals 11, and the two test terminals 12 are both connected to one end of the third switch K3.

[0039] Specifically, one end of the fourth switch K4 is connected to the first electrode, and the other end of the fourth switch K4 is connected to one of the two functional ends. One end of the second switch K2 is connected to the first electrode, and the other end of the second switch K2 is connected to the other of the two functional ends.

[0040] It should be noted that the airbag connected to the airbag connector 10 requires both functional ports to be connected to corresponding wiring harnesses to operate. Each test terminal 12 corresponds one-to-one with a functional terminal 11, meaning that each functional terminal 11 in the airbag connector 10 is normally connected to the corresponding test terminal 12, while the two test terminals are disconnected. Furthermore, since the fourth switch K4 and the third switch K3 are in the same state, a single relay can be used to switch the first, second, third, and fourth switches K1, K2, K3, and K4. Specifically, when the relay's driver receives a corresponding electrical signal, it controls the first switch K1 to close, the second switch K2 to open, the third switch K3 to open, and the fourth switch K4 to open. If no corresponding electrical signal is received or the relay is de-energized, the first switch K1 opens, the second switch K2 closes, the third switch K3 closes, and the fourth switch K4 closes.

[0041] Furthermore, in order to detect whether there is conduction between the two functional terminals 11 and the corresponding test terminals 12, and then detect whether there are other substances in the two test terminals 12 that cause the test terminals 12 to be blocked; in some embodiments, there are multiple detection units, and the first electrode, the fourth switch K4, the functional terminal 11, the test terminal 12, the third switch K3 and the second electrode form a second detection circuit; the first detection circuit and the second detection circuit are both connected to the first end of at least one detection unit.

[0042] Specifically, the multiple detection units are a fifth switch K5 and a sixth switch K6. One end of the fifth switch K5 is connected to the first detection circuit, and one end of the sixth switch K6 is connected to the second detection circuit. In some embodiments, the other ends of the fifth switch K5 and the sixth switch K6 are both connected to the first input terminal of the control unit C, allowing the control unit C to obtain the continuity status between the two functional terminals 11 and the two test terminals 12. In other embodiments, the other ends of the fifth switch K5 and the sixth switch K6 are respectively connected to two input terminals of the control unit C, thereby allowing the control unit C to obtain the continuity status of the first detection circuit and the second detection circuit.

[0043] It should be noted that at least one first end of a detection unit is connected to each of the first and second detection circuits. This allows for detection of the continuity between the two functional terminals 11 and the corresponding two test terminals 12. This allows for further identification of the location of the disconnection if no continuity occurs, facilitating further testing. Furthermore, both test terminals 12 are connected to one end of a third switch K3. This means that when the third switch K3 is closed, both test terminals 12 are connected to the second electrode. When the third switch K3 is open, the two test terminals 12 are short-circuited.

[0044] Furthermore, the impedance test unit T in the present application adopts a four-wire impedance tester, including four port leads (Lcur, Lpot, Hcur, and Hpot), each performing its own function, and together forming a high-precision impedance measurement system. The four-wire connection method effectively eliminates the influence of lead resistance and contact resistance on the measurement results, thereby improving the accuracy and reliability of the measurement. In some embodiments, the measuring end includes a first detection end t1, a second detection end t2, a third detection end t3, and a fourth detection end t4. The first detection end t1 and the second detection end t2 are each connected to one of the two functional ends 11, and the third detection end t3 and the fourth detection end t4 are each connected to the other of the two functional ends 11. Specifically, the first detection terminal t1 is the current lead corresponding to the Lcur port, the second detection terminal t2 is the voltage lead corresponding to the Lpot port, the third detection terminal t3 is the current lead corresponding to the Hcur port, and the fourth detection terminal t4 is the voltage lead corresponding to the Hpot port. Among them, the first detection terminal t1 forms a current detection loop through the airbag connector 10 to the third detection terminal t3, and the second detection terminal t2 forms a voltage detection loop through the airbag connector 10 to the fourth detection terminal t4.

[0045] Furthermore, in some embodiments, the impedance testing device further includes a display device corresponding to each test terminal. Specifically, the display device may be an LED light. Specifically, the first detection circuit is connected to an LED light, and the second detection circuit is connected to an LED light. When the first detection circuit is conductive, the corresponding LED light is illuminated; when the first detection circuit is not conductive, the corresponding LED light is not illuminated. When the second detection circuit is conductive, the corresponding LED light is illuminated; when the second detection circuit is not conductive, the corresponding LED light is not illuminated. Thus, a visual structure for faults is provided.

[0046] See also Figure 3 and Figure 4 The exemplary working principle of an impedance testing device provided in this application is as follows:

[0047] In the first working state, the first switch K1 is open, the second switch K2 is closed, the third switch K3 is closed, and the fourth switch K4 is closed. When the first detection circuit is turned on and the second detection circuit is turned on, the electrical signal of the first detection circuit causes the fifth switch K5 to be closed, and the electrical signal of the second detection circuit causes the sixth switch K6 to be closed. The fifth switch K5 and the sixth switch K6 output a first electrical level to the control unit C. When the control unit C receives the first electrical level, it indicates that it has received information that the first detection circuit and the second detection circuit are turned on.

[0048] When the first detection circuit is on and the second detection circuit is off, the electrical signal of the first detection circuit closes the fifth switch K5, and the absence of an electrical signal in the second detection circuit opens the sixth switch K6. The fifth switch K5 outputs a first electrical level to the control unit C. When the control unit C receives the first electrical level, it indicates that it has received information that the first detection circuit is on. When the sixth switch K6 outputs no electrical signal to the control unit C, if the control unit C does not receive the first electrical level, it indicates that it has received information that the first detection circuit is off.

[0049] When the first detection circuit and the second detection circuit are disconnected, the absence of an electrical signal in the first detection circuit causes the fifth switch K5 to be disconnected, and the absence of an electrical signal in the second detection circuit causes the sixth switch K6 to be disconnected. No electrical signals are output from the fifth switch K5 and the sixth switch K6 to the control unit C. If the control unit C does not receive the first level, it indicates that it has received information that the first detection circuit and the second detection circuit are disconnected.

[0050] In the second working state, the first switch K1 is closed, the second switch K2 is opened, the third switch K3 is opened, and the fourth switch K4 is opened. The first detection terminal t1 and the second detection terminal t2 in the impedance tester are connected to one of the two functional terminals 11, and the third detection terminal t3 and the fourth detection terminal t4 are connected to the other of the two functional terminals 11, so that the first detection terminal t1 forms a current detection loop through the airbag connector 10 to the third detection terminal t3, and the second detection terminal t2 forms a voltage detection loop through the airbag connector 10 to the fourth detection terminal t4, and then the impedance test of the airbag connector 10 is performed by the impedance tester.

[0051] It should be noted that the continuity of the first detection circuit and the second detection circuit indicates the continuity between the two functional terminals 11 and their corresponding two test terminals 12, that is, the continuity of the two test terminals 12. The impedance test device of the present application provides a simple and convenient detection structure for whether the test terminals 12 are blocked, improves the accuracy of the impedance test, reduces the misjudgment rate of the continuity test station, and provides a visual structure for fault analysis to facilitate the monitoring of the test terminals 12.

[0052] Accordingly, the detection system provided in the embodiment of the present application includes the impedance testing device in the above embodiment and can have all the technical features and technical effects of the above impedance testing device, which will not be described in detail here.

[0053] Accordingly, the device provided in the embodiment of the present application includes the detection system in the above embodiment, and can have all the technical features and technical effects of the above detection system, and further have all the technical features and technical effects of the above impedance testing device, which will not be repeated here.

[0054] The above is a detailed introduction to an impedance testing device, detection system and equipment provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An impedance testing device, characterized in that: include: An impedance testing unit, the impedance testing unit comprising a measuring end; A power supply, comprising a first electrode and a second electrode; A switch unit, the switch unit including a first switch, a second switch, and a third switch, wherein the states of the first switch and the second switch are opposite, and the states of the second switch and the third switch are the same, one end of the first switch is connected to the measuring end, one end of the second switch is connected to the first electrode, the other end of the first switch and the other end of the second switch are both used to connect to the functional end of the airbag connector, one end of the third switch is connected to the second electrode, and the other end of the third switch is used to connect to the test end of the airbag connector.

2. The impedance testing device according to claim 1, wherein: Also includes: The detection unit is used to output a first level when the functional end and the test end are connected, and the first level is used to drive the first switch to close, the second switch to open, and the third switch to open.

3. The impedance testing device according to claim 2, wherein: The first electrode, the second switch, the functional end, the test end, the third switch and the second electrode form a first detection circuit. The detection unit includes a first end and a second end. The first end is connected to the first detection circuit. When the first detection circuit is turned on, the second end is used to output a first level.

4. The impedance testing device according to claim 3, characterized in that: The detection unit is a fifth switch, one end of the fifth switch is used as the first end, and the other end of the fifth switch is used as the second end.

5. The impedance testing device according to claim 3, characterized in that: Also includes: A control unit having a first input terminal and a first output terminal, wherein the first input terminal is connected to the second terminal for receiving the first electrical level, and the first output terminal is configured to output a drive signal when the first input terminal receives the first electrical level, wherein the drive signal is used to drive the first switch to close, the second switch to open, and the third switch to open.

6. The impedance testing device according to claim 3, characterized in that: When the airbag connector has two functional ends and two test ends corresponding one-to-one to the functional ends, the switch unit further includes a fourth switch, the fourth switch and the third switch have the same state, one end of the fourth switch is connected to the first electrode, the other end of the second switch and the other end of the fourth switch are respectively connected to the two functional ends, and the two test ends are both connected to one end of the third switch.

7. The impedance testing device according to claim 6, characterized in that: There are multiple detection units, and the first electrode, the fourth switch, the functional end, the test end, the third switch and the second electrode form a second detection circuit; the first detection circuit and the second detection circuit are both connected to the first end of at least one detection unit.

8. The impedance testing device according to claim 6, characterized in that: The measuring end includes a first detection end, a second detection end, a third detection end, and a fourth detection end. The first detection end and the second detection end are both connected to one of the two functional ends, and the third detection end and the fourth detection end are both connected to the other of the two functional ends.

9. A detection system, characterized in that: An impedance testing device comprising the device described in any one of claims 1 to 8.

10. A device, characterized in that The method comprises the detection system as claimed in claim 9.

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