A device and method for testing electromagnetic separation of a dropped connector

Abstract

The present invention provides a device and method for testing the electromagnetic separation of a detachable connector, which belongs to the field of precision instrument testing. The device includes a base plate, a door-shaped bracket, a power supply, a resistor, an oscilloscope, and a detachable connector. Two door-shaped brackets are provided, which are arranged in parallel and spaced apart on the base plate. A mounting plate is provided between the two door-shaped brackets. The power supply and the oscilloscope are provided on the mounting plate. A first switch is provided on the power supply. The power supply is electrically connected to the resistor and the detachable connector respectively. The oscilloscope is connected in parallel with the resistor, and the resistor is connected in parallel with the detachable connector. The detachable connector is located below the mounting plate. The detachable connector includes a first terminal and a second terminal. The first terminal is located below the second terminal. A second switch is provided between the second terminal and the power supply. The use of a device and method for testing the electromagnetic separation of a detachable connector provided by an embodiment of the present invention can solve the problems of low testing efficiency and low accuracy in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of precision instrument testing, and in particular to a device and method for testing electromagnetic separation of a dropped connector. Background Art

[0002] With the continuous development of disconnect connectors, manual mechanical separation has gradually been replaced by electromagnetic separation. Electromagnetic disconnect connectors add an electromagnetic component to the mechanical disconnect connector. During electromagnetic separation, a specified electrical signal is input into the connector's electromagnetic component. The electromagnetic component operates, converting electromagnetic energy into mechanical energy, separating the two ends of the disconnect connector. However, the electromagnetic separation process of different disconnect connectors varies due to the different structures of each disconnect connector, resulting in different separation times. Therefore, testing the electromagnetic separation time of disconnect connectors has become an indispensable step.

[0003] In the prior art, electromagnetic separation testing of a disconnected connector is usually performed by placing the disconnected connector horizontally on a test bench and connecting it to a circuit. After an electrical signal is applied, the time for the circuit to disconnect is manually counted.

[0004] The electromagnetic separation test device for detached connectors in the prior art places the detached connector horizontally on the laboratory table, so the detached connector can only be separated by electromagnetic means. During the separation process, friction may occur between the connector and the workbench, resulting in insufficient separation. As a result, the measured separation time data is mostly invalid data, and repeated tests are required to obtain accurate test results, resulting in low test efficiency. In addition, since time is measured in the form of manual counting, the accuracy is low. Summary of the Invention

[0005] The embodiment of the present invention provides a device and method for electromagnetic separation testing of a disconnected connector, which can solve the problems of low testing efficiency and low accuracy in the prior art. The technical solution is as follows:

[0006] In a first aspect, a device for testing electromagnetic separation of a dropped connector includes: a base plate, a door-shaped bracket, a power supply, a resistor, an oscilloscope, and a dropped connector.

[0007] Two door-shaped brackets are provided and arranged in parallel and at intervals on the base plate. A mounting plate is provided between the two door-shaped brackets. The power supply and the oscilloscope are provided on the mounting plate. A first switch is provided on the power supply. The power supply is electrically connected to the resistor and the detachable connector respectively. The oscilloscope is connected in parallel with the resistor, and the resistor is connected in parallel with the detachable connector. The detachable connector is located below the mounting plate. The detachable connector includes a first terminal and a second terminal. The first terminal is located below the second terminal. A second switch is provided between the second terminal and the power supply.

[0008] Optionally, a connecting rod is provided between the two door-shaped brackets, and the connecting rod is located at the top end of the door-shaped bracket.

[0009] Optionally, it further includes a wire and a support frame, the power supply, resistor, oscilloscope and detachable connector are connected by a wire, and the support frame is arranged on the connecting rod to provide support for the wire.

[0010] Optionally, a storage box is provided on the bottom plate, and the storage box is provided between the two door-shaped brackets and below the first terminal.

[0011] Optionally, a rubber net is provided in the storage box.

[0012] Optionally, a buffer mechanism is provided at the bottom of the storage box, and the buffer mechanism includes a sliding rod, a sliding sleeve and a spring. The sliding sleeve is provided on the bottom plate, one end of the sliding rod is fixed to the bottom of the storage box, and the other end is slidably provided inside the sliding sleeve. The spring is provided on the sliding rod and is located between the sliding sleeve and the storage box.

[0013] Optionally, four buffer mechanisms are provided and arranged in a rectangular array at the bottom of the storage box.

[0014] Optionally, a sliding groove is provided on one side of the door-shaped brackets close to each other, and a protrusion matching the sliding groove is provided on the side of the storage box close to the door-shaped bracket, and the protrusion is slidably provided in the sliding groove.

[0015] Optionally, anti-skid pads are provided at the bottom of the base plate, and the anti-skid pads are located at the four corners of the base plate.

[0016] In a second aspect, a method for testing electromagnetic separation of a disconnected connector includes the aforementioned electromagnetic separation testing device for a disconnected connector, and the steps include:

[0017] Step 1: Connect the resistor and the dropout connector in parallel and connect them to the power circuit, connect the oscilloscope in parallel to the resistor, and close the first switch;

[0018] Step 2: Observe the waveform on the oscilloscope, close the second switch, and record the first time node t when the waveform begins to change;

[0019] Step 3: Wait for the first terminal to be detached from the second terminal, observe the waveform on the oscilloscope, and record the second time node T when the waveform changes again. Tt is the time when the detached connector is separated.

[0020] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0021] An embodiment of the present invention provides a device and method for testing electromagnetic separation of a detachable connector. A resistor, an oscilloscope, and a detachable connector are arranged on a mounting plate. The resistor and the detachable connector are connected in parallel, and the oscilloscope is connected in parallel to both ends of the resistor. When the first switch is closed, the circuit of the resistor is connected, and the voltage of the resistor can be measured by the oscilloscope. When the second switch is closed, the detachable connector is connected in parallel to the circuit, and the voltage of the resistor measured by the oscilloscope changes. After waiting for a period of time, the first terminal and the second terminal will be separated, disconnecting the circuit of the detachable connector. Due to the action of gravity, the second terminal will be more easily separated from the first terminal. At this time, The voltage of the resistor measured by the oscilloscope will change again. By recording the time difference between the two changes, the separation time of the detached connector can be measured. When it is necessary to measure the separation time of other detached connectors, it is only necessary to replace the detached connector and connect it to the circuit. The separation time of the detached connector measured by this method is not affected by the interference of the external environment or parts and cannot be separated because the first terminal and the second terminal are arranged longitudinally. This can reduce the test time and improve the test efficiency. The readings through the oscilloscope are more accurate, which can effectively solve the problems of low test efficiency and low accuracy in the existing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 Schematic diagram of the overall structure of the device provided by an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the overall structure after removing one side of the door-type bracket provided by an embodiment of the present invention;

[0025] Figure 3 The embodiment of the present invention provides Figure 2 A schematic diagram of the enlarged structure at point A;

[0026] Figure 4 This is a schematic diagram of the electronic component connection structure provided by an embodiment of the present invention;

[0027] Figure 5 is a schematic diagram of the electronic component connection structure from another angle provided by an embodiment of the present invention;

[0028] Figure 6 It is a flow chart of the method provided by an embodiment of the present invention.

[0029] In the figure: 1-base plate; 11-anti-slip pad; 2-door bracket; 21-mounting plate; 22-connecting rod; 23-support frame; 24-slide groove; 3-power supply; 31-first switch; 4-resistor; 5-oscilloscope; 6-detachable connector; 61-first terminal; 62-second terminal; 7-second switch; 8-wire; 9-storage box; 91-rubber net; 92-protrusion; 10-buffer mechanism; 101-sliding rod; 102-sliding sleeve; 103-spring. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0031] Figure 1 Schematic diagram of the overall structure of the device provided by an embodiment of the present invention; Figure 2 This is a schematic diagram of the overall structure after removing one side of the door-type bracket provided by an embodiment of the present invention; Figure 3 The embodiment of the present invention provides Figure 2 A schematic diagram of the enlarged structure at point A; Figure 4 This is a schematic diagram of the electronic component connection structure provided by an embodiment of the present invention; Figure 5 is a schematic diagram of the electronic component connection structure from another angle provided by an embodiment of the present invention; Figure 6 This is a flow chart of the method provided by the embodiment of the present invention. Figures 1 to 6 A detachable connector electromagnetic separation test device includes: a base plate 1, a door-shaped bracket 2, a power supply 3, a resistor 4, an oscilloscope 5 and a detachable connector 6, wherein two door-shaped brackets 2 are provided and arranged in parallel and spaced apart on the base plate 1, a mounting plate 21 is provided between the two door-shaped brackets 2, the power supply 3 and the oscilloscope 5 are provided on the mounting plate 21, a first switch 31 is provided on the power supply 3, the power supply 3 is electrically connected to the resistor 4 and the detachable connector 6 respectively, the oscilloscope 5 is connected in parallel with the resistor 4, and the resistor 4 is connected in parallel with the detachable connector 6, the detachable connector 6 is located below the mounting plate 21, the detachable connector 6 includes a first terminal 61 and a second terminal 62, the first terminal 61 is located below the second terminal 62, and a second switch 7 is provided between the second terminal 62 and the power supply 3.

[0032] Illustratively, in the embodiment of the present invention, the power supply 3 , the resistor 4 , the oscilloscope 5 and the drop-out connector 6 are all electronic components of the device, and are all connected via a wire 8 . The power supply 3 is fixed on the mounting plate 21, and the resistor 4 and the oscilloscope 5 are fixed on the mounting plate 21 together. The detachable connector 6 is then fixed to the bottom of the mounting plate 21 so that the second terminal 62 is fixed to the bottom of the mounting plate 21 and the first terminal 61 is located below the second terminal 62. The power supply 3 and the resistor 4 are connected through a wire 8 to form a circuit. The oscilloscope 5 is connected in parallel to the circuit at both ends of the resistor 4. The positive pole of the power supply 3 is connected to the first terminal 61 and the negative pole of the power supply 3 is connected to the second terminal 62 through a wire 8. The second switch 7 is set between the second terminal 62 and the negative pole of the power supply 3. First, close the first switch 31 and turn on the power supply 3 to energize the resistor 4. At this time, the oscilloscope 5 can measure the voltage across the resistor 4 to form a waveform. After the second switch 7 is closed, the detachable connector 6 and the resistor 4 are connected to the circuit in parallel. At this time, the voltage across the resistor 4 measured on the oscilloscope 5 will change, and the waveform formed thereon will also change. After the detachable connector 6 is energized for a period of time, the first terminal 61 and the second terminal 62 are separated. Since the first terminal 61 and the second terminal 62 are arranged longitudinally, the success rate of the first terminal 61 falling off and separating under the action of gravity is high, and the separation failure will not be affected by factors such as the external environment or the friction resistance of the equipment. The detaching connector 6 disconnects the circuit connection, and the voltage across the resistor 4 returns to the initial state. The oscilloscope 5 measures that the voltage across the resistor 4 changes again. By recording the time when the waveform on the oscilloscope 5 changes twice, the time difference is the time required for the detaching connector 6 to separate. A connector is provided at the connection between the wire 8 and the first terminal 61 and the second terminal 62, and an interface is provided on the first terminal 61 and the second terminal 62. The interface on each detaching connector to be tested is consistent. By plugging the connector and the interface, different detaching connectors 6 can be quickly replaced for measurement, thereby improving the efficiency of the test.

[0033] An embodiment of the present invention provides a device and method for testing electromagnetic separation of a detached connector. A resistor 4, an oscilloscope 5, and a detached connector 6 are arranged on a mounting plate 21. The resistor 4 and the detached connector 6 are connected in parallel, and the oscilloscope 5 is connected in parallel to both ends of the resistor 4. When the first switch 31 is closed, the circuit of the resistor 4 is connected, and the voltage of the resistor 4 can be measured by the oscilloscope 5. When the second switch 7 is closed, the detached connector 6 is connected in parallel to the circuit, and the voltage of the resistor 4 measured by the oscilloscope 5 changes. After waiting for a period of time, the first terminal 61 and the second terminal 62 will be detached, disconnecting the circuit of the detached connector 6. Due to the action of gravity, the second terminal 62 will be more easily separated from the first terminal 61 is separated, at this time the voltage measured by the oscilloscope 5 for the resistor 4 will change again, and the separation time of the detached connector 6 can be measured by recording the time difference between the two changes. When it is necessary to measure the separation time of other detached connectors 6, it is only necessary to replace the detached connector 6 and connect it to the circuit. The separation time of the detached connector 6 measured by this method is that the first terminal 61 and the second terminal 62 are arranged longitudinally, so that the detached connector 6 will not be disturbed by the external environment or parts and cannot be separated, thereby reducing the test time and improving the test efficiency. The readings through the oscilloscope 5 are more accurate, which can effectively solve the problems of low test efficiency and low accuracy in the prior art.

[0034] Optionally, a connecting rod 22 is provided between the two door-shaped brackets 2 , and the connecting rod 22 is located at the top end of the door-shaped bracket 2 .

[0035] For example, in an embodiment of the present invention, by arranging a connecting rod 22 between the two door-shaped brackets 2, the connection between the two door-shaped brackets 2 is made more stable, so that the mounting plate 21 can be more stably set on the door-shaped bracket 2, and then the entire circuit structure can be stably set on the door-shaped bracket 2, thereby improving the stability of the device.

[0036] Optionally, it further includes a wire 8 and a support frame 23 , the power supply 3 , the resistor 4 , the oscilloscope 5 and the detachable connector 6 are connected via the wire 8 , and the support frame 23 is set on the connecting rod 22 to provide support for the wire 8 .

[0037] For example, in an embodiment of the present invention, since the first terminal 61 will fall off and separate from the second terminal 62 after being energized for a period of time, the first terminal 61 will fall under the action of gravity. Therefore, the wire 8 between the first terminal 61 and the positive pole of the power supply is a soft wire 8, which facilitates the free falling of the first terminal 61. The other parts of the wire 8 are hard wires 8 because they need to maintain the stability of the circuit, and the support frame 23 set on the connecting rod 22 provides fixed support for the hard wire 8, thereby ensuring the stability of the entire circuit, thereby further improving the stability of the device.

[0038] Optionally, a storage box 9 is provided on the bottom plate 1 , and the storage box 9 is provided between the two door-shaped brackets 2 and below the first terminal 61 .

[0039] For example, in an embodiment of the present invention, since the first terminal 61 will fall after falling off and separating, in order to prevent the falling first terminal 61 from colliding with other components and to provide protection for the first terminal 61, a storage box 9 is provided underneath it, thereby increasing the service life of the device.

[0040] Optionally, a rubber net 91 is provided in the storage box 9 .

[0041] For example, in an embodiment of the present invention, a rubber net 91 is provided in the storage box 9 to prevent the falling first terminal 61 from colliding with the storage box 9. The rubber net 91 acts as a buffer for the falling of the first terminal 61, thereby further improving the service life of the device.

[0042] Optionally, a buffer mechanism 10 is provided at the bottom of the storage box 9, and the buffer mechanism 10 includes a sliding rod 101, a sliding sleeve 102 and a spring 103. The sliding sleeve 102 is provided on the base plate 1, one end of the sliding rod 101 is fixed to the bottom of the storage box 9, and the other end is slidably provided inside the sliding sleeve 102. The spring 103 is sleeved on the sliding rod 101 and is located between the sliding sleeve 102 and the storage box 9.

[0043] For example, in an embodiment of the present invention, when the first terminal 61 falls into the storage box 9, the buffer mechanism 10 can buffer the downward force of the first terminal 61, thereby preventing the first terminal 61 from colliding with the storage box 9. When the first terminal 61 falls into the storage box 9, the storage box 9 carries the sliding rod 101 downward, and the other end of the sliding rod 101 also slides in the sliding sleeve 102, thereby compressing the spring 103, offsetting the downward force of the storage box 9, thereby preventing the storage box 9 from being damaged by excessive force, thereby further improving the service life of the device.

[0044] Optionally, four buffer mechanisms 10 are provided and arranged in a rectangular array at the bottom of the storage box 9 .

[0045] Illustratively, in an embodiment of the present invention, four buffer mechanisms 10 are provided, and the four buffer mechanisms 10 are arranged in a rectangular array at the bottom of the storage box 9. This allows the storage box 9 to be more stably arranged on the buffer mechanism 10, so that the storage box 9 will not tilt due to the downward force of the first terminal 61, thereby further improving the stability of the device.

[0046] Optionally, a slide groove 24 is provided on one side of the door-shaped bracket 2 , and a protrusion 92 matching the slide groove 24 is provided on the side of the storage box 9 close to the door-shaped bracket 2 , and the protrusion 92 can be slidably set in the slide groove 24 .

[0047] For example, in an embodiment of the present invention, through the cooperation of the slide groove 24 and the protrusion 92, the storage box 9 can be provided with a vertical guide when buffering on the buffer mechanism 10, thereby preventing the storage box 9 from tilting due to uneven force, thereby further improving the stability of the device.

[0048] Optionally, anti-skid pads 11 are provided at the bottom of the base plate 1 , and the anti-skid pads 11 are located at the four corners of the base plate 1 .

[0049] For example, in this embodiment of the present invention, by providing an anti-slip pad 11 at the bottom of the base plate 1, the downward force of the first terminal 61 can be prevented from being too large, which could cause the entire device to slide. The anti-slip pad 11 can be made of a material such as rubber to increase the friction between the device and the experimental table. The provision of the anti-slip pad 11 further improves the stability of the device.

[0050] A method for testing electromagnetic separation of a disconnected connector includes the aforementioned electromagnetic separation testing device for a disconnected connector, and the steps include:

[0051] S1: Connect the resistor 4 and the dropout connector 6 in parallel and connect them to the power supply 3 circuit. Connect the oscilloscope 5 in parallel to the resistor 4 and close the first switch 31.

[0052] S2: Observe the waveform on the oscilloscope 5, close the second switch 7, and record the first time node t when the waveform starts to change.

[0053] S3: Wait for the first terminal 61 to be separated from the second terminal 62, observe the waveform on the oscilloscope 5, and record the second time node T when the waveform changes again. Tt is the time when the connector is separated.

[0054] Exemplarily, in an embodiment of the present invention, the power supply 3 is fixed on the mounting plate 21, and the resistor 4 and the oscilloscope 5 are fixed on the mounting plate 21 together, and then the detachable connector 6 is fixed to the bottom of the mounting plate 21, so that the second terminal 62 is fixed to the bottom of the mounting plate 21, and the first terminal 61 is located below the second terminal 62, and the power supply 3 and the resistor 4 are connected through the wire 8 to form a circuit, and the oscilloscope 5 is connected in parallel to the circuit at both ends of the resistor 4, and then the positive pole of the power supply 3 is connected to the first terminal 61 and the negative pole of the power supply 3 is connected to the second terminal 62 through the wire 8, and the second switch 7 is set between the second terminal 62 and the negative pole of the power supply 3. First, the first switch 31 is closed and the power supply 3 is turned on to energize the resistor 4. At this time, the oscilloscope 5 can measure the voltage across the resistor 4 to form a waveform. After the second switch 7 is closed, the detachable connector 6 and the resistor 4 are connected to the circuit in parallel. At this time, the voltage across the resistor 4 measured on the oscilloscope 5 will change, and the waveform formed thereon will also change. At this time, the first time node t is recorded. After the detachable connector 6 is powered for a period of time, the first terminal 61 and the second terminal 62 separate, the detachable connector 6 disconnects the circuit, and the voltage across the resistor 4 returns to its initial state. The oscilloscope 5 measures that the voltage across the resistor 4 changes again, and records the second time node T at this time. By calculating Tt, the time required for the detachable connector 6 to separate can be obtained.

[0055] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the art to which the invention belongs. The terms "first", "second" and similar words used in the patent specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "an" do not indicate a quantitative limitation, but rather indicate the presence of at least one. Terms such as "include" or "comprising" mean that the elements or objects appearing before "include" or "comprising" include the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper", "lower", "left", and "right" are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0056] The above descriptions are merely optional embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for testing electromagnetic separation of a disconnected connector, characterized in that: include: Base plate (1), door bracket (2), power supply (3), resistor (4), oscilloscope (5) and dropout connector (6), Two door-shaped brackets (2) are provided and arranged in parallel and spaced apart on the base plate (1); a mounting plate (21) is provided between the two door-shaped brackets (2); the power supply (3) and the oscilloscope (5) are provided on the mounting plate (21); a first switch (31) is provided on the power supply (3); the power supply (3) is electrically connected to the resistor (4) and the drop-out connector (6) respectively; the oscilloscope (5) is connected in parallel with the resistor (4); the resistor (4) is connected in parallel with the drop-out connector (6); the drop-out connector (6) is located below the mounting plate (21); the drop-out connector (6) includes a first terminal (61) and a second terminal (62); the first terminal (61) is located below the second terminal (62); a second switch (7) is provided between the second terminal (62) and the power supply (3).

2. The electromagnetic separation test device for a disconnected connector according to claim 1, characterized in that: A connecting rod (22) is provided between the two door-shaped brackets (2), and the connecting rod (22) is located at the top end of the door-shaped bracket (2).

3. The electromagnetic separation test device for a dropped connector according to claim 2, characterized in that: It also includes a wire (8) and a support frame (23), wherein the power supply (3), the resistor (4), the oscilloscope (5) and the drop-out connector (6) are connected via the wire (8), and the support frame (23) is arranged on the connecting rod (22) to provide support for the wire (8).

4. The electromagnetic separation test device for a dropped connector according to claim 1, characterized in that: A storage box (9) is provided on the bottom plate (1); the storage box (9) is provided between the two door-shaped brackets (2) and is located below the first terminal (61).

5. The electromagnetic separation test device for a disconnected connector according to claim 4, characterized in that: A rubber net (91) is provided in the storage box (9).

6. The electromagnetic separation test device for a disconnected connector according to claim 4, characterized in that: A buffer mechanism (10) is provided at the bottom of the storage box (9), and the buffer mechanism (10) comprises a sliding rod (101), a sliding sleeve (102) and a spring (103). The sliding sleeve (102) is provided on the bottom plate (1). One end of the sliding rod (101) is fixed to the bottom of the storage box (9), and the other end is slidably provided inside the sliding sleeve (102). The spring (103) is sleeved on the sliding rod (101) and is located between the sliding sleeve (102) and the storage box (9).

7. The electromagnetic separation test device for a disconnected connector according to claim 6, characterized in that: Four buffer mechanisms (10) are provided and arranged in a rectangular array at the bottom of the storage box (9).

8. The electromagnetic separation test device for a dropped connector according to claim 6, characterized in that: The door-shaped brackets (2) are provided with a sliding groove (24) on one side close to each other, and the storage box (9) is provided with a protrusion (92) matching the sliding groove (24) on the side close to the door-shaped bracket (2), and the protrusion (92) is slidably arranged in the sliding groove (24).

9. The electromagnetic separation test device for a disconnected connector according to claim 1, characterized in that: Anti-skid pads (11) are provided at the bottom of the base plate (1), and the anti-skid pads (11) are located at the four corners of the base plate (1).

10. A method for testing electromagnetic separation of a disconnected connector, comprising the electromagnetic separation testing device for a disconnected connector according to any one of claims 1 to 9, characterized in that the steps include: Step 1: connect the resistor (4) and the dropout connector (6) in parallel, and connect them to the power supply (3) circuit, connect the oscilloscope (5) in parallel to the resistor (4), and close the first switch (31); Step 2: Observe the waveform on the oscilloscope (5), close the second switch (7), and record the first time point t when the waveform begins to change; Step three: wait for the first terminal (61) to be separated from the second terminal (62), observe the waveform on the oscilloscope (5), and record the second time node T when the waveform changes again, Tt being the time when the detached connector is separated.

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