Auxiliary device for electromagnetic interference test

Abstract

The utility model provides an auxiliary device for testing electromagnetic interference, which is applied to an electromagnetic range and comprises a testing pot, an auxiliary pot and a fixing support, the testing pot is arranged on the electromagnetic range, the electromagnetic range is arranged on a fixing base, and the fixing support is used for connecting the testing pot and the auxiliary pot. A water supplementing pipeline is arranged between the test pot and the auxiliary pot, a water supplementing valve is arranged in the test pot and used for controlling opening and closing of the water supplementing pipeline, and the auxiliary device for the electromagnetic interference test can accurately control the water amount in the test pot by arranging the water supplementing pipeline and the water supplementing valve, so that the consistency of test conditions is ensured; and the accuracy of the electromagnetic interference test is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic testing, and particularly relates to an auxiliary device for electromagnetic interference testing. Background Art

[0002] Electromagnetic interference (abbreviated as EMI) testing is a test that electromagnetic products need to undergo before being sold to meet the relevant EMI test specifications. When conducting EMI testing on an induction cooker, the existing testing methods include placing a test cookware filled with water on the induction cooker, and then using an electromagnetic interference testing device to test the induction cooker. However, during the testing process, since the test cookware cannot be fixed on the induction cooker, a water film is formed at the bottom of the test cookware, causing the cookware to deviate from its original position during the heating process, thereby changing the heating power of the induction cooker, and further causing the EMI reading data to deviate from the truth; not adding water or adding less water during the testing process will cause the liquid in the test cookware to dry out, and adding too much water will change the testing state and not meet the standard requirements, thus causing the EMI reading data to deviate from the truth. Content of the Utility Model

[0003] The purpose of the utility model is to provide an auxiliary device for electromagnetic interference testing for at least one of the above existing technical problems. The auxiliary device for electromagnetic interference testing can stably adjust the water volume in the test cookware, reduce the situation of the test cookware shifting, and further improve the accuracy of electromagnetic interference testing.

[0004] The utility model provides an auxiliary device for electromagnetic interference testing, which is applied to an induction cooker. The auxiliary device for electromagnetic interference testing includes a test cookware, an auxiliary cookware, and a fixing bracket.

[0005] The test cookware is arranged on the induction cooker, the induction cooker is arranged on a fixed base, and the fixing bracket is used to connect the test cookware and the auxiliary cookware.

[0006] A water replenishing pipeline is arranged between the test cookware and the auxiliary cookware, and a water replenishing valve is arranged in the test cookware. The water replenishing valve is used to control the opening and closing of the water replenishing pipeline.

[0007] In a possible implementation manner, the auxiliary device for electromagnetic interference testing further includes a first communicating vessel and a second communicating vessel.

[0008] The first communicating vessel is in contact with the inner wall of the test cookware to detect the liquid level height of the test cookware, and the second communicating vessel is in contact with the inner wall of the auxiliary cookware to detect the liquid level height of the auxiliary cookware.

[0009] In a possible implementation, the liquid level height of the first communicating vessel is higher than that of the second communicating vessel.

[0010] In a possible implementation, a liquid guiding device is provided on the fixing bracket.

[0011] In a possible implementation, the fixing bracket includes an annular bracket, and the inner diameter of the annular bracket is greater than the outer diameter of the test cookware.

[0012] In a possible implementation, the fixing bracket further includes a connecting rod. One end of the connecting rod is connected to the auxiliary cookware, and the other end of the connecting rod is connected to the annular bracket.

[0013] In a possible implementation, a water discharge valve is provided on the auxiliary cookware.

[0014] In a possible implementation, the dimensions of the fixing base along the first direction and the second direction are adjustable, and the first direction and the second direction intersect.

[0015] In a possible implementation, the fixing base is arranged on the test tabletop, and the height of the fixing base is lower than the height of the test tabletop.

[0016] In a possible implementation, the difference between the outer diameter and the inner diameter of the annular bracket is 1 mm - 50 mm.

[0017] An auxiliary device for electromagnetic interference testing provided by the present utility model has the following beneficial effects:

[0018] An auxiliary device for electromagnetic interference testing provided by the present utility model is applied to an induction cooker. It is characterized in that the auxiliary device for electromagnetic interference testing includes a test cookware, an auxiliary cookware, and a fixing bracket. The test cookware is arranged on the induction cooker, the induction cooker is arranged on the fixing base, the fixing bracket is used to connect the test cookware and the auxiliary cookware, a water replenishing pipeline is arranged between the test cookware and the auxiliary cookware, and a water replenishing valve is arranged in the test cookware. The water replenishing valve is used to control the opening and closing of the water replenishing pipeline. By arranging the water replenishing pipeline and the water replenishing valve, the water volume in the test cookware is accurately controlled, the consistency of the test conditions is ensured, and the accuracy of the electromagnetic interference testing is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the present utility model, the drawings required for use in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1It is a schematic structural diagram of an auxiliary device for electromagnetic interference testing in an embodiment of the present utility model;

[0021] Figure 2 It is a schematic structural diagram of an auxiliary device for electromagnetic interference testing in another embodiment of the present utility model;

[0022] Figure 3 It is a schematic structural diagram of a test cookware in an embodiment of the present utility model;

[0023] Figure 4 It is a front view of an auxiliary device for electromagnetic interference testing in an embodiment of the present utility model;

[0024] Figure 5 It is a top view of an auxiliary device for electromagnetic interference testing in an embodiment of the present utility model.

[0025] The following is a supplementary description of the drawings:

[0026] 10. Induction cooker; 11. Fixed base; 20. Test cookware; 21. First connector; 30. Auxiliary cookware; 31. Second connector; 32. Drain valve; 40. Water replenishing pipeline; 41. Water replenishing valve; 50. Ring bracket; 51. Connecting rod. Specific implementation manner

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0028] As used herein, the term "one embodiment" or "embodiment" refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present application. In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. Moreover, terms such as "first" and "second" are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0029] Referring to Figure 1 , the present application provides an auxiliary device for electromagnetic interference testing, which is applied to an induction cooker 10. The auxiliary device for electromagnetic interference testing includes a test cookware 20, an auxiliary cookware 30, and a fixing bracket. The test cookware 20 is arranged on the induction cooker 10, and the induction cooker 10 is arranged on a fixed base 11. The fixing bracket is used to connect the test cookware 20 and the auxiliary cookware 30. A water replenishing pipeline 40 is arranged between the test cookware 20 and the auxiliary cookware 30, and a water replenishing valve 41 is arranged in the test cookware 20. The water replenishing valve 41 is used to control the opening and closing of the water replenishing pipeline 40. By arranging the water replenishing pipeline 40 and the water replenishing valve 41, the water volume in the test cookware 20 can be accurately controlled to ensure the consistency of test conditions and improve the accuracy of electromagnetic interference testing.

[0030] It can be understood that the test cookware 20 is heated by electromagnetic induction during the test. If the water in the test cookware 20 splashes out, the test cookware 20 will deviate from the preset position due to resonance, resulting in a change in the heating power of the induction cooker 10 and causing the EMI reading data to deviate from the truth; the water volume in the test cookware 20 will continuously decrease during the heating process of the induction cooker 10 due to boiling and splashing of the heated water and evaporation of water vapor, and adding water will affect the heating state of the induction cooker 10, thus causing the EMI reading data to deviate from the truth; during the process of adding water to the test cookware 20, the water temperature of the newly added water in the test cookware 20 will affect the test data. The test cookware 20 needs to keep the water volume in the pot at about 50% according to the standard requirements during the test.

[0031] Specifically, the test cookware 20 includes a test cookware 20 with a diameter of 110 mm and a test cookware 20 with a diameter of 210 mm.

[0032] Specifically, the induction cooker 10 is arranged on the detection table. The detection table includes a fixed base 11. The induction cooker 10 to be tested is matched with the fixed base 11, and the induction cooker 10 to be tested is connected to the corresponding EMI test device to collect the EMI test results of the induction cooker 10. The test cookware 20 is arranged on the induction cooker 10, and the bottom of the test cookware 20 is matched with the test area of the induction cooker 10.

[0033] In this embodiment, the auxiliary cookware 30 is used to replenish water for the test cookware 20. One end of the fixed bracket is fixedly connected to the auxiliary cookware 30, and the other end of the fixed bracket is in clearance fit with the test cookware 20.

[0034] Specifically, one end of the water replenishing pipeline 40 is arranged inside the test cookware 20, and the other end of the water replenishing pipeline 40 is arranged inside the auxiliary cookware 30. When the water level inside the test cookware 20 is lower than the preset water level, the water replenishing valve 41 is opened, and the water replenishing pipeline 40 connects the auxiliary cookware 30 and the test cookware 20 to replenish the water inside the auxiliary cookware 30 into the test cookware 20, so that the water level inside the test cookware 20 meets the preset water level.

[0035] Specifically, as Figure 2 and Figure 3 shown, the auxiliary device for electromagnetic interference testing further includes a first communicating vessel 21 and a second communicating vessel 31. The first communicating vessel 21 contacts the inner wall of the test cookware 20 to detect the liquid level height of the test cookware 20, and the second communicating vessel 31 contacts the inner wall of the auxiliary cookware 30 to detect the liquid level height of the auxiliary cookware 30. By setting the first communicating vessel 21 and the second communicating vessel 31, the liquid level heights of the test cookware 20 and the auxiliary cookware 30 can be monitored in real time. During the test, controlling the liquid level heights of the test cookware 20 and the auxiliary cookware 30 within a predetermined range can ensure the accuracy and consistency of the test results. Liquid level fluctuations may cause reflection and interference of electromagnetic waves, thereby affecting the test results.

[0036] Specifically, the first communicating vessel 21 and the second communicating vessel 31 are S-shaped communicating vessels. The first communicating vessel 21 and the second communicating vessel 31 form a set of liquid level comparison devices. One end of the first communicating vessel 21 is located inside the test cookware 20, and the other end of the first communicating vessel 21 is located between the test cookware 20 and the auxiliary cookware 30; one end of the second communicating vessel 31 is located inside the auxiliary cookware 30, and the other end of the second communicating vessel 31 is located between the test cookware 20 and the auxiliary cookware 30.

[0037] In this embodiment, one end of the first connector 21 is in contact with the inner wall of the test cookware 20 on the side close to the auxiliary cookware 30, and the other end of the first connector 21 is located between the test cookware 20 and the auxiliary cookware 30; one end of the second connector 31 is in contact with the inner wall of the test cookware 20 on the side close to the test cookware 20, and the other end of the second connector 31 is located between the test cookware 20 and the auxiliary cookware 30.

[0038] Further, the liquid level height of the first connector 21 is higher than that of the second connector 31. By specifying the height of each connector to display the water level of the test cookware 20 and the auxiliary cookware 30, it is then easy to judge the real-time liquid level of each cookware during the detection process.

[0039] Specifically, the pipe length of the first connector 21 in the direction close to the second connector 31 is the same as the pipe length of the second connector 31 in the direction close to the first connector 21.

[0040] Specifically, during the test, the liquid level height of the auxiliary cookware 30 is higher than that of the test cookware 20.

[0041] Further, a liquid guiding device is provided on the fixing bracket. In this way, the liquid guiding device is used to receive the water overflowing from the test cookware 20 during the test, reduce the contact between the overflowing water and the surface of the electromagnetic cooker 10, and thus improve the accuracy of the test result.

[0042] In this embodiment, one end of the liquid guiding device is connected to the fixing bracket, and the other end of the liquid guiding device is connected to the liquid guiding pipeline, thereby continuously reducing the situation of the overflowing water contacting the surface of the electromagnetic cooker 10.

[0043] Specifically, as Figures 4 - 5 shown, the fixing bracket includes an annular bracket 50, and the inner diameter of the annular bracket 50 is larger than the outer diameter of the test cookware 20. Through the clearance fit between the annular bracket 50 and the test cookware 20, the annular bracket 50 is not likely to damage the test cookware 20 during the process of the test cookware 20 being used in cooperation with the annular bracket 50, and the annular bracket 50 will not reduce the heat conduction efficiency, thereby preventing the test result of the test cookware 20 from being affected.

[0044] In one embodiment, the radial distance between the annular bracket 50 and the test cookware 20 is the same.

[0045] In another embodiment, a water-absorbing material is provided on the annular bracket 50.

[0046] Furthermore, the fixing bracket further includes a connecting rod 51. One end of the connecting rod 51 is connected to the auxiliary cookware 30, and the other end of the connecting rod 51 is connected to the annular bracket 50. Fixing the connection between the auxiliary cookware 30 and the annular bracket 50 through the connecting rod 51 helps to maintain the stability of the auxiliary cookware 30 and the test cookware 20 during use, reducing the risk of the test cookware 20 tilting or moving.

[0047] In one embodiment, the connecting rod 51 is integrally formed with the annular bracket 50; in another embodiment, the connecting rod 51 is detachably connected to the annular bracket 50.

[0048] Furthermore, a drain valve 32 is provided on the auxiliary cookware 30. By providing the drain valve 32, it is convenient to adjust the liquid level height inside the auxiliary cookware 30 to improve the water replenishing effect on the test cookware 20.

[0049] Specifically, the drain valve 32 is provided on the side of the auxiliary cookware 30 away from the test cookware 20. At the end of the test, open the drain valve 32 for drainage, which is convenient for further processing the water in the auxiliary cookware 30 and the test cookware 20.

[0050] In one possible embodiment, the opening and closing and the opening degree of the drain valve 32 are controlled and adjusted by a PLC; in another possible embodiment, the opening and closing and the opening degree of the drain valve 32 are manually adjusted by an operator.

[0051] Specifically, the dimensions of the fixing base 11 in the first direction and the second direction are adjustable, and the first direction and the second direction intersect. In this way, the user can quickly adjust the dimensions of the fixing base 11 according to the needs to adapt to different sizes of the induction cooker 10, improving the work efficiency.

[0052] Optionally, the way to adjust the dimensions of the fixing base 11 can be screw or knob adjustment, or it can be chute type adjustment, snap type adjustment or manual adjustment, etc.

[0053] In this embodiment, the first direction of the fixing base 11 is perpendicular to the second direction.

[0054] Specifically, the fixing base 11 is arranged on the test tabletop, and the height of the fixing base 11 is lower than the height of the test tabletop. In this way, the fixing base 11 below the tabletop can enhance the overall stability of the induction cooker 10. During dynamic testing, it can effectively reduce the tilting and shaking of the induction cooker 10 and the test cookware 20. If vibrations occur during the test, the fixing base 11 below the tabletop can buffer the vibrations to a certain extent and reduce the impact on other equipment on the detection tabletop.

[0055] Specifically, the fixing base 11 is a sunken fixing base 11, and the induction cooker 10 after being combined with the fixing base 11 is higher than the test tabletop.

[0056] In one embodiment, the difference between the outer diameter and the inner diameter of the annular bracket 50 is 1 mm - 50 mm. By defining the difference between the outer diameter and the inner diameter of the annular bracket 50, the probability that the annular bracket 50 receives the water overflowing from the test cookware 20 is increased, thereby reducing the influence of the overflowing water on the test result.

[0057] Specifically, the test cookware 20 includes a test cookware 20 with a diameter of 110 mm and a test cookware 20 with a diameter of 210 mm. When heating the test cookware 20 with a diameter of 110 mm, when the liquid level is at 50%, 95% of the splashed liquid lands at a position between 3 mm and 27 mm from the edge of the cookware; when heating the test cookware 20 with a diameter of 210 mm, when the liquid level is at 50%, 95% of the splashed liquid lands between 4 mm and 32 mm from the edge of the cookware.

[0058] In another embodiment, the difference between the outer diameter and the inner diameter of the annular bracket 50 is 3 mm - 35 mm.

[0059] Specifically, in one possible implementation, when the test cookware 20 is a test cookware 20 with a diameter of 110 mm, the inner diameter of the annular bracket 50 is 113 mm, and the outer diameter of the annular bracket 50 is 140 mm; in another possible implementation, when the test cookware 20 is a test cookware 20 with a diameter of 210 mm, the inner diameter of the annular bracket 50 is 213 mm, and the outer diameter of the annular bracket 50 is 245 mm.

[0060] The working process of the water cooling system in the embodiments of the present application is introduced below in combination with specific application scenarios, as follows:

[0061] First, connect the electromagnetic cooker 10 to be tested to the fixed base 11 on the test bench, then place the test cookware 20 on the electromagnetic cooker 10 to be tested, and connect the electromagnetic cooker 10 to be tested to the EMI test device;

[0062] Then, put the annular bracket 50 on the test cookware 20, place one end of the water replenishing pipeline 40 provided with the water replenishing valve 41 in the test cookware 20, and then place the other end of the water replenishing pipeline 40 in the auxiliary cookware 30;

[0063] After that, when the test cookware 20 and the auxiliary cookware 30 are properly matched and both the first connector 21 and the second connector 31 meet the preset liquid level conditions, turn on the EMI test device, and the auxiliary cookware 30 is used to replenish water to the test cookware 20 in real time;

[0064] Finally, after the detection is completed, turn off the EMI test device and record the EMI test result of the electromagnetic cooker 10 to be tested.

[0065] The following introduces specific embodiments of the present application based on the above technical solutions.

[0066] Embodiment 1

[0067] Please refer to Figure 1 , this embodiment provides an auxiliary device for electromagnetic interference testing, which is applied to an induction cooker 10. The auxiliary device for electromagnetic interference testing includes a test cookware 20, an auxiliary cookware 30 and a fixing bracket. The test cookware 20 is arranged on the induction cooker 10, the induction cooker 10 is arranged on a fixed base 11, and the fixing bracket is used to connect the test cookware 20 and the auxiliary cookware 30. A water replenishing pipeline 40 is arranged between the test cookware 20 and the auxiliary cookware 30, and a water replenishing valve 41 is arranged in the test cookware 20. The water replenishing valve 41 is used to control the opening and closing of the water replenishing pipeline 40.

[0068] The induction cooker 10 is arranged on a detection table. The detection table includes a fixed base 11. The dimensions of the fixed base 11 in the first direction and the second direction are adjustable, and the first direction and the second direction are perpendicular. The to-be-tested induction cooker 10 is matched with the fixed base 11, and the to-be-tested induction cooker 10 is connected to a corresponding EMI testing device to collect the EMI test results of the induction cooker 10. The test cookware 20 is arranged on the induction cooker 10, and the bottom of the test cookware 20 is matched with the test area of the induction cooker 10. The auxiliary cookware 30 is used to replenish water to the test cookware 20. One end of the fixing bracket is fixedly connected to the auxiliary cookware 30, and the other end of the fixing bracket is in clearance fit with the test cookware 20. A drain valve 32 is arranged on the auxiliary cookware 30, and the drain valve 32 is arranged on the side wall of the auxiliary cookware 30.

[0069] Embodiment 2

[0070] The common points between Embodiment 2 and Embodiment 1 will not be elaborated here. The difference between Embodiment 2 and Embodiment 1 is that the auxiliary device for electromagnetic interference testing further includes a first communicating vessel 21 and a second communicating vessel 31. As Figures 2 - 5 shown, the first communicating vessel 21 is in contact with the inner wall of the test cookware 20 to detect the liquid level height of the test cookware 20, and the second communicating vessel 31 is in contact with the inner wall of the auxiliary cookware 30 to detect the liquid level height of the auxiliary cookware 30. The first communicating vessel 21 and the second communicating vessel 31 are S-shaped communicating vessels. The liquid level height of the first communicating vessel 21 is higher than that of the second communicating vessel 31.

[0071] Embodiment 3

[0072] The common features of Example 3 and Example 1 will not be elaborated here. The difference between Example 3 and Example 1 lies in the fixing bracket. The fixing bracket includes an annular bracket 50, and the inner diameter of the annular bracket 50 is greater than the outer diameter of the test cookware 20. The fixing bracket further includes a connecting rod 51. One end of the connecting rod 51 is connected to the auxiliary cookware 30, and the other end of the connecting rod 51 is connected to the annular bracket 50. The connecting rod 51 is detachably connected to the annular bracket 50. The difference between the outer diameter and the inner diameter of the annular bracket 50 is 3 mm - 35 mm.

[0073] When the test cookware 20 is a test cookware 20 with a diameter of 110 mm, the inner diameter of the annular bracket 50 is 113 mm, and the outer diameter of the annular bracket 50 is 140 mm.

[0074] Example 4

[0075] The common features of Example 4 and Example 1 will not be elaborated here. The difference between Example 4 and Example 1 is that when the test cookware 20 is a test cookware 20 with a diameter of 210 mm, the inner diameter of the annular bracket 50 is 213 mm, and the outer diameter of the annular bracket 50 is 245 mm.

[0076] The above-disclosed are only several preferred embodiments of the present utility model, and the scope of rights of the present utility model cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present utility model still fall within the scope covered by the present utility model.

Claims

1. An auxiliary device for electromagnetic interference testing, which is applied to an induction cooker (10), characterized in that The auxiliary device for electromagnetic interference testing includes a test cookware (20), an auxiliary cookware (30), and a fixing bracket. The test cookware (20) is arranged on the electromagnetic cooker (10), and the electromagnetic cooker (10) is arranged on a fixed base (11). The fixing bracket is used to connect the test cookware (20) and the auxiliary cookware (30). A water replenishing pipeline (40) is arranged between the test cookware (20) and the auxiliary cookware (30). A water replenishing valve (41) is arranged in the test cookware (20), and the water replenishing valve (41) is used to control the opening and closing of the water replenishing pipeline (40).

2. The auxiliary device for electromagnetic interference testing according to claim 1, wherein The auxiliary device for electromagnetic interference testing further includes a first communicating vessel (21) and a second communicating vessel (31). The first communicating vessel (21) contacts the inner wall of the test cookware (20) to detect the liquid level height of the test cookware (20), and the second communicating vessel (31) contacts the inner wall of the auxiliary cookware (30) to detect the liquid level height of the auxiliary cookware (30).

3. The auxiliary device for electromagnetic interference testing according to claim 2, wherein The liquid level height of the first communicating vessel (21) is higher than that of the second communicating vessel (31).

4. The auxiliary device for electromagnetic interference testing according to claim 1 or 2, characterized in that A liquid guiding device is arranged on the fixing bracket.

5. The auxiliary device for electromagnetic interference testing according to claim 1 or 2, characterized in that The fixing bracket includes an annular bracket (50), and the inner diameter of the annular bracket (50) is larger than the outer diameter of the test cookware (20).

6. The auxiliary device for electromagnetic interference testing according to claim 5, characterized in that The fixing bracket further includes a connecting rod (51). One end of the connecting rod (51) is connected to the auxiliary cookware (30), and the other end of the connecting rod (51) is connected to the annular bracket (50).

7. The auxiliary device for electromagnetic interference testing according to claim 1 or 2, characterized in that, A drain valve (32) is arranged on the auxiliary cookware (30).

8. The auxiliary device for electromagnetic interference testing according to claim 1 or 2, characterized in that, The dimensions of the fixed base (11) along the first direction and the second direction are adjustable, and the first direction and the second direction intersect.

9. The auxiliary device for electromagnetic interference testing according to claim 1 or 2, characterized in that The fixed base (11) is arranged on a test tabletop, and the height of the fixed base (11) is lower than the height of the test tabletop.

10. The auxiliary device for electromagnetic interference testing according to claim 5, wherein, The difference between the outer diameter and the inner diameter of the annular bracket (50) is 1 mm - 50 mm.

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