Connector for testing

Abstract

A test connector includes: a plunger provided with a first through hole extending in a vertical direction; a probe extending in the vertical direction in the first through hole; the circuit board is provided with a signal transmission path and a coaxial cable access terminal, the probe is electrically connected with the input end of the signal transmission path, and the coaxial cable access terminal is electrically connected with the output end of the signal transmission path; and a signal acquired by the probe is transmitted to the coaxial cable access terminal through the signal transmission path. The connector for testing provided by the utility model is beneficial to improving the accuracy of signal testing.

Description

TECHNICAL FIELD

[0001] The utility model relates to a connector technical field for signal test especially relates to a connector for test. BACKGROUND

[0002] In prior art, the connector for testing radio frequency signal usually comprises probe, plunger and coaxial cable, the probe collects the measured analog signal, then directly transmits the measured signal to the coaxial cable, and transmits the signal to the signal processing device for measurement through the coaxial cable.

[0003] In the measurement scene of near field communication (NFC) signal, because NFC signal is easy to attenuate and very sensitive to the impedance change of transmission medium, the impedance of transmission medium needs to be kept at a certain value (such as 50 ohms) in the test scene to obtain more accurate measurement results. When the above-mentioned existing connector is used to measure NFC signal, the impedance change caused by the movement of coaxial cable can not obtain accurate test results. SUMMARY

[0004] The technical problem solved by the embodiments of the utility model is how to improve the accuracy of NFC signal test.

[0005] To solve the above technical problem, the utility model discloses a connector for test, comprising: plunger, being provided with the first through hole extending along the up-down direction;Probe, extending along the up-down direction in the first through hole;Circuit board, the circuit board is provided with signal transmission path and coaxial cable access terminal, the probe is electrically connected with the input end of signal transmission path, and the coaxial cable access terminal is electrically connected with the output end of signal transmission path;Wherein, the signal collected by the probe is transmitted to the coaxial cable access terminal through the signal transmission path.

[0006] In the scheme of the embodiments of the utility model, the connector for test is provided with circuit board, and the circuit board is provided with signal transmission path and coaxial cable access terminal, the probe is electrically connected with the input end of signal transmission path, and the coaxial cable access terminal is electrically connected with the output end of signal transmission path, and the signal processing circuit is arranged between the input end and the output end. In the above scheme, the measured signal collected by the probe is transmitted to the coaxial cable access terminal through the signal transmission path on the circuit board, and because the signal transmission path on the circuit board is fixed on the circuit board and is inflexible, the impedance change caused by unstable electrical connection between the probe and the coaxial cable can be avoided. Compared with prior art, the scheme of the embodiments of the utility model is conducive to inhibiting the impedance change on the transmission path of the measured signal, thereby improving the accuracy of signal test.

[0007] Optionally, the plunger is fixed to a first surface of the circuit board, an input end of the signal transmission path is arranged on the first surface of the circuit board, and the probe is abutted to the input end.

[0008] Optionally, the coaxial cable access terminal is located on a second surface of the circuit board, the second surface being opposite to the first surface.

[0009] Optionally, the test connector further comprises a flange for mounting the test connector to an external device, and a spring having opposite first and second ends in the up-down direction, wherein the first end is abutted to the flange and the second end is abutted to the second surface of the circuit board.

[0010] Optionally, the flange is provided with a second through hole extending in the up-down direction, and the test connector further comprises a housing having opposite base end and front end in the up-down direction, the base end being inserted into the second through hole and the front end being fixed to the second surface of the circuit board, the housing being movable relative to the flange in the up-down direction, and the spring is sleeved on the housing.

[0011] Optionally, the front end is provided with a groove on an end surface facing the second surface. In consideration of the fact that the plunger is subjected to an upward pushing force when the probe contacts the circuit under test during detection, the circuit board may be deformed if the circuit board is thin. Therefore, in the scheme of the embodiment of the utility model, a groove is arranged on the end surface of the front end of the housing facing the circuit board to accommodate the deformation of the circuit board, which is conducive to ensuring the accuracy of the test result.

[0012] Optionally, a first region on the second surface is used for arranging the coaxial cable access terminal, the front end is fixed to a second region on the second surface, and the first region and the second region are different regions on the second surface.

[0013] Optionally, two coaxial cable access terminals are arranged on the circuit board, and the front end is fixed between the two coaxial cable access terminals. In the above scheme, the coaxial cable access terminals are arranged on both sides of the front end of the housing. Since the material of the housing in the connector is usually metal, arranging the housing between the two coaxial cable access terminals is conducive to avoiding mutual interference between the two signals output by the two coaxial cable access terminals, thereby further ensuring the accuracy of the test result.

[0014] Optionally, the test connector further comprises a spring seat sleeved on the front end of the housing, and the second end of the spring is abutted to the spring seat.

[0015] Optionally, the connector further comprises a bolt, the plunger is provided with a first bolt hole extending in the up-down direction and penetrating through, the circuit board is provided with a second bolt hole extending in the up-down direction and penetrating through, and the bolt is sequentially inserted into the first bolt hole and the second bolt hole to fix the plunger and the circuit board.

[0016] Optionally, the plunger is provided with two first bolt holes, and the first through hole is arranged between the two first bolt holes.

[0017] Optionally, the connector further comprises a positioning pin fixed to the plunger, the circuit board is provided with a positioning hole extending in the up-down direction, the positioning pin is fixed in the positioning hole, and a height of a part of the positioning pin protruding from the plunger is less than a thickness of the circuit board.

[0018] Optionally, the signal transmission path comprises a signal processing circuit connected between the input end and the output end.

[0019] Optionally, the signal processing circuit comprises an LC resonant circuit.

[0020] Optionally, the connector further comprises a probe holding portion arranged in the first through hole and supporting the probe in an insulated manner from the plunger. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a whole structure diagram of a connector for testing in the embodiment of the utility model;

[0022] Figure 2 is Figure 1 is an exploded view of the connector for testing in the embodiment of the utility model;

[0023] Figure 3 is Figure 1 is a partial sectional view of the connector for testing in the embodiment of the utility model along the up-down direction;

[0024] Figure 4 is a schematic view of a shell in the embodiment of the utility model;

[0025] Figure 5 is a schematic view of a plunger in the embodiment of the utility model;

[0026] Figure 6 isFigure 1 Another partial cross-sectional view of the test connector along the up-down direction. DETAILED DESCRIPTION

[0027] Next, embodiments of the present application will be described in detail with reference to the accompanying drawings. The same reference numbers are used in all drawings to refer to the same or like parts. Each embodiment is merely an example, and of course, the structures shown in different embodiments can be partially replaced or combined. In the modified examples, the description of matters common to Embodiment 1 is omitted, and only different points are described. In particular, the same effects produced by the same structures are not mentioned one by one for each embodiment.

[0028] In order to make the above-mentioned purpose, features and advantages of the present application more obvious and understandable, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0029] It should be noted that the test connector in the embodiments of the present application can be used for testing signals (such as NFC signals) transmitted internally or externally in electronic devices (such as mobile phones, tablet computers, etc.).

[0030] Reference Figure 1 , Figure 2 and Figure 3 , Figure 1 is a whole structure diagram of a test connector in the embodiments of the present application, Figure 2 is an exploded view of a test connector in the embodiments of the present application, Figure 3 is Figure 1 a cross-sectional view of the test connector along the up-down direction.

[0031] In combination with Figure 1 , Figure 2 and Figure 3 , the test connector 1 can include a probe 11, a plunger 12 and a circuit board 13.

[0032] Specifically, the probe 11 is a needle-shaped component, and the probe 11 can be used for collecting signals and transmitting signals. The number and arrangement of the probe 11 are not limited in the embodiments of the present application.

[0033] Specifically, the plunger 12 is provided with a first through hole 120 extending along the up-down direction and penetrating through, and the probe 11 is arranged in the first through hole 120, and the probe 11 does not contact the inner peripheral surface of the first through hole 120, that is, there can be a gap between the probe 11 and the inner peripheral surface of the first through hole 120. Wherein, the plunger 12 can be made of metal.

[0034] It should be noted that in the embodiments of the present application, the direction in which the probe 11 extends is defined as the up-down direction. In the drawings, the U direction represents the upward direction, and the D direction represents the downward direction.

[0035] As shown in Figure 2 , the test connector 1 can further comprise a probe holder 14 arranged in the first through hole 120 and used for fixing the probe 11. Specifically, the probe holder 14 is fixed in the first through hole 120, and the probe holder 14 also has a through hole in the up-down direction, the probe 11 extends in the up-down direction in the through hole of the probe holder 14, thereby the probe holder 14 supports the probe 11. In a specific implementation, the probe holder 14 fixes the probe 11 in a manner that the probe 11 is insulated from the plunger 12. Exemplarily, the probe holder 14 can be made of an insulating material (for example, epoxy resin, etc.).

[0036] Further, the test connector 1 can further comprise a support 20 also arranged in the first through hole 120 of the plunger 12, and the support 20 can be used for supporting the probe 11. Specifically, the support 20 can have a cylindrical shape when viewed in the up-down direction, and the number of the supports 20 is consistent with the number of the probes 11. The support 20 has a central axis extending in the up-down direction, and the central axis of the support 20 coincides with the central axis of the probe 11. In a specific implementation, the probe 11 has opposite first and second end portions 110 and 111 in its extending direction, the second end portion 111 is the end close to the circuit board 13, and the first end portion 110 is the end away from the circuit board 13. The support 20 is arranged in the first through hole 120 close to the first end portion 110 of the probe 11, and the probe holder 14 is arranged in the first through hole 120 close to the second end portion 111 of the probe 11.

[0037] As shown in Figure 3 , the probe 11 passes through the first through hole 120 and abuts against the circuit board 13.

[0038] Further, as shown in Figure 1 and Figure 2 , the circuit board 13 can be provided with a signal transmission path (not shown in the figure) and a coaxial cable access terminal 130. The coaxial cable access terminal 130 can be accessed by a coaxial cable (not shown in the figure) to transmit signals.

[0039] Specifically, the signal transmission path has an input end and an output end, wherein the input end is electrically connected with the probe 11, the signals collected by the probe 11 are transmitted from the input end to the signal transmission path and transmitted from the output end. The output end of the signal transmission path is electrically connected with the coaxial cable access terminal 130. Thus, the signals collected by the probe 11 can be transmitted to the coaxial cable access terminal 130 via the signal transmission path, then transmitted to the coaxial cable via the coaxial cable access terminal 130, and transmitted to an external detection device via the coaxial cable.

[0040] As shown in Figure 2And Figure 3 As shown in the figure, in a possible implementation, the probe 11 has a first end 110 and a second end 111 in its extending direction, the first end 110 is used to contact the circuit under test to collect signals, and the second end 111 abuts against the input end of the signal transmission path. Exemplarily, the input end of the signal transmission path is an electrode pad arranged on the first surface 131 of the circuit board 13, and the second end 111 of the probe 11 abuts against the electrode pad. The coaxial cable access terminal 130 is arranged on the second surface 132 of the circuit board 13.

[0041] It should be noted that, in the embodiment of the utility model, the surface of the circuit board 13 facing the probe 11 and the plunger 12 is defined as the first surface, and the other surface opposite to the first surface is defined as the second surface.

[0042] Further, in the scheme of the embodiment of the utility model, a signal processing circuit can be arranged between the input end and the output end of the signal transmission path. The input signal of the signal processing circuit is the signal collected by the probe 11, the output signal of the signal processing circuit is the processed signal, and the processed signal can be transmitted to the external detection device via the coaxial cable access terminal 130 and the coaxial cable. Compared with the signal collected by the probe 11, the processed signal has lower sensitivity to impedance change. In the specific implementation, the signal processing circuit can be a circuit capable of reducing the sensitivity of the signal to the impedance change, and the embodiment does not limit the specific structure of the signal processing circuit and the specific position of the signal processing circuit on the circuit board 13.

[0043] In the specific implementation, the signal collected by the probe 11 is an analog signal. In a possible implementation, the signal processing circuit can include an analog-to-digital conversion circuit. That is, the signal processing circuit can include a circuit for converting the analog signal into a digital signal.

[0044] In another possible implementation, the signal processing circuit can include an LC resonant circuit. The LC resonant circuit can be used to realize impedance matching between the input end and the output end of the signal transmission path.

[0045] By using the above scheme, the signal collected by the probe 11 is processed by the signal processing circuit before being transmitted to the external coaxial cable, and the sensitivity of the signal to the impedance change is reduced by processing the signal, so that even if the external coaxial cable is deformed due to mechanical movement, the influence of the impedance change caused by the deformation on the signal is small, which is beneficial to improve the accuracy of signal testing.

[0046] Further, in the scheme of the embodiment of the utility model, the connector 1 for testing can further include a housing 16.

[0047] In one possible implementation, the housing 16 can be a cylindrical component extending in the vertical direction. That is, the housing 16 can be hollow.

[0048] Alternatively, in another possible implementation, the housing 16 can be a columnar component extending in the vertical direction. That is, the housing 16 can be solid.

[0049] The circuit board 13 can be fixed between the plunger 12 and the housing 16. Specifically, the plunger 12 is fixed to the first side 131 of the circuit board 13, and the housing 16 is fixed to the second side 132 of the circuit board 13.

[0050] In one possible implementation, the test connector 1 further includes a bolt 19. Correspondingly, the plunger 12 is provided with a first bolt hole that extends vertically and penetrates through the circuit board 13, the circuit board 13 is provided with a second bolt hole that extends vertically and penetrates through the circuit board 13, and the housing 16 is provided with a third bolt hole. The bolt 19 is inserted sequentially into the first bolt hole, the second bolt hole, and the third bolt hole to fix the plunger 12, the circuit board 13, and the housing 16.

[0051] Combination Figure 4 , Figure 4 This is a schematic diagram of a housing according to an embodiment of this utility model. For example... Figure 4 As shown, the housing 16 has a base end 161 and a front end 162 facing each other in the vertical direction. The front end 162 is fixed to the second surface 132 of the circuit board 13. Specifically, a third bolt hole 1620 is provided on the end face of the front end 162 facing the second surface 132. The bolt 19 passes through the first bolt hole and the second bolt hole and is fixed in the third bolt hole 1620.

[0052] Furthermore, a groove 1621 is provided on the end face of the front end 162 facing the second surface 132.

[0053] In a specific implementation, the groove 1621 can face the signal processing circuit on the circuit board 13. The circuit under test is located below the test connector 1. During testing, the test connector 1 moves downward so that the probe 11 can collect the signal from the circuit under test. When the probe 11 contacts the circuit under test, the probe 11 is pushed upward. Since the probe 11 abuts against the circuit board 13, the circuit board 13 is also pushed upward. The circuit board 13 may deform due to the pushing force, especially if the circuit board 13 is thin. Therefore, a groove 1621 is provided on the end face of the front end 162 facing the circuit board 13 to avoid deformation of the circuit board 13, especially to avoid deformation of the area where the signal processing circuit is located on the circuit board 13. This helps to ensure that the signal collected by the probe 11 is processed normally, thereby ensuring the accuracy of the test results.

[0054] In the embodiment of the utility model, the first area of the second surface 132 is provided with the coaxial cable access terminal 130, and the second area of the second surface 132 is used for fixing the front end 162, wherein the first area and the second area are different areas on the second surface 132. That is, the first area and the second area are completely non-overlapping.

[0055] In a possible implementation, as shown in Figure 1 and Figure 2 , two coaxial cable access terminals 130 are arranged on the circuit board 13, and the front end 162 is fixed between the two coaxial cable access terminals 130. That is, the two coaxial cable access terminals 130 are respectively located on the two sides of the front end 162. Among them, the material of the shell 16 is metal, and the front end 162 is arranged between the two coaxial cable access terminals 130, which can avoid mutual interference between the two signals output by the two coaxial cable access terminals 130, thereby facilitating to ensure the accuracy of signal detection.

[0056] In other embodiments, the number of coaxial cable access terminals 130 can be 1, or the number of coaxial cable access terminals 130 can be 3 or more than 3, and the present embodiment does not limit this.

[0057] Continuing to refer to Figure 1 , Figure 2 and Figure 3 , the flange 15 can be a plate-shaped component, and the flange 15 is used to install the test connector 1 on an external device, wherein the external device can be used to control the movement of the test connector 1. In a specific implementation, the flange 15 is arranged near the base end 161 of the shell 16 in the up-down direction. Among them, the flange 15 can be made of metal.

[0058] Specifically, the flange 15 is provided with a second through hole 150 extending in the up-down direction, and the base end 161 of the shell 16 is inserted into the second through hole 150 of the flange 15. More specifically, the diameter of the upper end of the base end 161 is greater than the diameter of the second through hole 150, so that the base end 161 cannot pass through the second through hole 15 in the downward direction, but the base end 161 can move relative to the flange 15 in the upward direction.

[0059] Further, the spring 17 is sleeved on the shell 16, and the spring 17 has opposite first end 171 and second end 172 in the up-down direction. Among them, the first end 171 abuts against the flange 15. Specifically, the first end 171 of the spring 17 is in contact with the lower surface of the flange 15, and the second end 172 of the spring 17 abuts against the spring seat 18.

[0060] More specifically, the test connector 1 further comprises a spring seat 18, the spring seat 18 is sleeved on the front end 162 of the shell 16, the spring seat 18 surrounds the outer peripheral part of the front end 162, and the second end 172 of the spring 18 abuts against the spring seat 18. In this way, the spring 17 can exert a force in the upward direction and away from each other on the flange 15 and the spring seat 18. Since the spring seat 18 is fixed with the shell 16, and the shell 16 is fixed with the circuit board 13, the spring 17 can exert a force in the opposite direction on the flange 15 and the circuit board 13. Specifically, the spring 17 pushes the flange 15 in the upward direction, and the spring 17 pushes the shell 16 and the circuit board 13 in the downward direction.

[0061] In a specific implementation, when the circuit board 13 is subjected to a pushing force in the upward direction, the spring 17 is contracted, and the circuit board 13 and the shell 16 are displaced relative to the flange 15 in the upward direction. When the pushing force in the upward direction on the circuit board 13 is removed, the spring 17 recovers the deformation, pushes the spring seat 13 in the downward direction, and the circuit board 13 and the shell 16 are displaced relative to the flange in the downward direction.

[0062] It should be noted that in other embodiments of the present application, the shell 16 can be omitted. For example, the test connector 1 can comprise a nut adapted to the bolt 19, the bolt 19 is sequentially inserted into the first bolt hole and the second bolt hole and fixed in the nut, thereby fixing the plunger 12 and the circuit board 13.

[0063] Further, the first end 171 of the spring 17 abuts against the lower surface of the flange 15, and the second end 172 abuts against the second surface 132 of the circuit board 13. That is, the spring 17 can be directly fixed to the second surface 132 of the circuit board 13.

[0064] Referring to Figure 5 , Figure 5 is a schematic view of a plunger 12 in an embodiment of the present application. In a possible implementation, the number of bolts 19 is 2, and correspondingly, as shown in Figure 5 , the plunger 12 is provided with two first bolt holes 121. Further, the first through hole 120 is arranged between the two first bolt holes 121. In other words, the two first bolt holes 121 are respectively located on both sides of the first through hole 120, and the two first bolt holes 121 are symmetrical relative to the first through hole 120. By adopting such a scheme, the stability of the installation of the probe 11 can be ensured.

[0065] In combination with Figure 6 , Figure 6 is Figure 1 another partial cross-sectional view of the test connector in the upward and downward directions. Compared with the partial cross-sectional view shown in Figure 5 , the circuit board is hidden in Figure 6 to show the positioning pin 122.

[0066] Specifically, as shown in Figure 5 and Figure 6 The test connector 1 can further include a positioning pin 122. The positioning pin 122 can be arranged on the plunger 12. In a specific implementation, the positioning pin 122 and the plunger 12 can be integrally formed. Alternatively, the positioning pin 122 can be fixed on the plunger 12. For example, the plunger 12 is provided with a positioning hole extending in the up-down direction and penetrating through, and the positioning pin 122 is inserted into the positioning hole of the plunger 12 from the lower end of the plunger 12 and fixed in the positioning hole.

[0067] Further, the circuit board 13 is provided with a positioning hole extending in the up-down direction, and the end of the positioning pin 122 is fixed in the positioning hole of the circuit board 13. Specifically, the positioning hole on the circuit board 13 can be a through hole.

[0068] Further, the end of the positioning pin 122 protrudes from the plunger 12 but does not protrude from the circuit board 13. Specifically, the height of the part of the positioning pin 13 protruding from the plunger 12 is less than the thickness of the circuit board 13. In other words, the positioning pin 122 is fixed in the positioning hole of the circuit board 13, but the height of the part of the positioning pin 122 located in the positioning hole of the circuit board 13 is less than the thickness of the circuit board 13. With such a scheme, the end of the positioning pin 122 does not protrude from the circuit board 13, which is conducive to ensuring that the circuit board 13 is clamped by the plunger 12 and the shell 16, and avoiding the movement of the circuit board 13.

[0069] Although the utility model discloses as above, the utility model is not limited to this. Any person skilled in the art, without departing from the spirit and scope of the utility model, can make various changes and modifications, therefore the protection scope of the utility model should be the range limited by the claims.

[0070] Explanation of reference signs

[0071] 1-test connector

[0072] 11-probe

[0073] 110-first end

[0074] 111-second end

[0075] 12-plunger

[0076] 120-first through hole

[0077] 121-first bolt hole

[0078] 122-positioning pin

[0079] 13-circuit board

[0080] 130 - coaxial cable access terminal

[0081] 131 - first face

[0082] 132 - second face

[0083] 14 - probe holding portion

[0084] 15 - flange

[0085] 15 - second through hole

[0086] 16 - housing

[0087] 161 - base end

[0088] 162 - front end

[0089] 1620 - third bolt hole

[0090] 1621 - groove

[0091] 17 - spring

[0092] 171 - first end

[0093] 172 - second end

[0094] 18 - spring seat

[0095] 19 - bolt

[0096] 20 - support

Claims

1. A test connector, characterized by, The test connector comprises: a plunger provided with a first through hole extending in the up-down direction; a probe extending in the up-down direction in the first through hole; a circuit board provided with a signal transmission path and a coaxial cable access terminal, the probe being electrically connected to an input end of the signal transmission path, and the coaxial cable access terminal being electrically connected to an output end of the signal transmission path; wherein the signal collected by the probe is transmitted to the coaxial cable access terminal via the signal transmission path.

2. The test connector of claim 1, wherein, The plunger is fixed to a first surface of the circuit board, the input end of the signal transmission path is arranged on the first surface of the circuit board, and the probe abuts against the input end.

3. The test connector of claim 2, wherein, The coaxial cable access terminal is located on a second surface of the circuit board, the second surface being opposite to the first surface.

4. The test connector of claim 3, wherein, The test connector further comprises: a flange for mounting the test connector to an external device; a spring having opposite first and second ends in the up-down direction, wherein the first end abuts against the flange, and the second end abuts against the second surface of the circuit board.

5. The test connector of claim 4, wherein, The flange is provided with a second through hole extending in the up-down direction, and the test connector further comprises: a housing having opposite base and front ends in the up-down direction, the base end being inserted into the second through hole, and the front end being fixed to the second surface of the circuit board, the housing being movable relative to the flange in the up-down direction; wherein the spring is sleeved on the housing.

6. The test connector of claim 5, wherein, The front end has a groove on the end face facing the second surface.

7. The test connector of claim 5, wherein, A first region on the second surface is used for arranging the coaxial cable access terminal, and the front end is fixed to a second region on the second surface, the first and second regions being different regions on the second surface.

8. The test connector of claim 5, wherein, Two coaxial cable access terminals are arranged on the circuit board, and the front end is fixed between the two coaxial cable access terminals.

9. The test connector of claim 5, wherein, The test connector further comprises: a spring seat sleeved on the front end of the housing, and the second end of the spring abuts against the spring seat.

10. The test connector of claim 2, wherein, The test connector further comprises: a bolt; the plunger is provided with a first bolt hole extending in the up-down direction and penetrating through, the circuit board is provided with a second bolt hole extending in the up-down direction and penetrating through, and the bolt is sequentially inserted into the first and second bolt holes to fix the plunger and the circuit board.

11. The test connector of claim 10, wherein, The plunger is provided with two first bolt holes, and the first through hole is arranged between the two first bolt holes.

12. The test connector of claim 2, wherein, The test connector further comprises: a positioning pin fixed to the plunger; the circuit board is provided with a positioning hole extending in the up-down direction, and the positioning pin is fixed in the positioning hole; wherein the height of the part of the positioning pin protruding from the plunger is less than the thickness of the circuit board.

13. The connector for testing according to any one of claims 1 to 12, characterized in that, The signal transmission path comprises a signal processing circuit connected between the input end and the output end.

14. The test connector of claim 13, wherein, The signal processing circuit comprises an LC resonant circuit.

15. The connector for testing according to any one of claims 1 to 12, characterized in that, The test connector further comprises: a probe holding portion arranged in the first through hole and supporting the probe in a manner that the probe is insulated from the plunger.

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