Test device

Abstract

The invention discloses a test device. The test equipment comprises a test cavity, a test chamber is arranged in the test cavity, and the test cavity is used for accommodating a tested piece; an electrical cavity is arranged in the electrical cavity, the electrical cavity is separated from the test cavity, and the electrical cavity is an electromagnetic shielding cavity; the radio frequency module is used for outputting a radio frequency signal, and the radio frequency module is located in the electrical cavity; and the antenna is electrically connected with the radio frequency module, and the antenna is used for feeding the radio frequency signal into the test cavity and transmitting the electromagnetic wave radiated by the tested piece to the radio frequency module. According to the testing equipment, the electrical cavity is the electromagnetic shielding cavity, the radio frequency module is located in the electrical cavity, the electrical cavity can prevent electromagnetic interference generated when the radio frequency module works from radiating to the outside of the electrical cavity, the electromagnetic interference in the testing process is reduced, and the accuracy of the testing result is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment detection, and in particular to a testing device. Background Art

[0002] In the related art, the test equipment for performing electromagnetic compatibility test on the DUT has a test chamber, the DUT is placed in the test chamber, and the RF module of the test equipment outputs RF signals, which are fed into the test chamber via the antenna to simulate the electromagnetic interference environment of the DUT. However, when the RF module and other components of the test equipment are working, electromagnetic interference signals will also be generated, which will affect the test results and cause inaccurate test results. Summary of the invention

[0003] The embodiments of the present invention provide a testing device to solve at least one of the above-mentioned technical problems.

[0004] A testing device according to an embodiment of the present invention comprises:

[0005] A test cavity, wherein a test cavity is provided in the test cavity, and the test cavity is used to accommodate the tested object;

[0006] An electrical cavity, wherein an electrical cavity is provided in the electrical cavity, the electrical cavity is separated from the test cavity, and the electrical cavity is an electromagnetic shielding cavity;

[0007] A radio frequency module, the radio frequency module is used to output a radio frequency signal, and the radio frequency module is located in the electrical cavity;

[0008] An antenna is electrically connected to the radio frequency module, and is used to feed the radio frequency signal into the test cavity and to conduct the electromagnetic waves radiated by the device under test to the radio frequency module.

[0009] In the above-mentioned test equipment, the electrical cavity is an electromagnetic shielding cavity, and the RF module is located in the electrical cavity. The electrical cavity can prevent the electromagnetic interference generated by the RF module when it is working from radiating outside the electrical cavity, thereby reducing the electromagnetic interference during the test and improving the accuracy of the test results.

[0010] In some embodiments, the electrical cavity is a metal cavity.

[0011] In some embodiments, the electrical cavity includes a plastic cavity and an electromagnetic shielding layer, wherein the electromagnetic shielding layer covers an outer surface and / or an inner surface of the plastic cavity.

[0012] In some embodiments, the radio frequency module includes a transmitter and a receiver, the transmitter includes a first shell, the receiver includes a second shell, and the first shell and the second shell are electromagnetic shielding shells.

[0013] In some embodiments, the testing device includes a power supply module and a power supply filter module, and the power supply filter module connects the power supply module and the radio frequency module.

[0014] In some embodiments, the testing device includes a control module, the power filter module, the power module, and the control module.

[0015] In some embodiments, the power supply module includes a first output terminal and a second output terminal, the power supply filter module includes a through-hole capacitor, the through-hole capacitor has a central through hole, the first output terminal passes through the central through hole and is in close contact with the hole wall of the central through hole, and the second output terminal is connected to the outer wall of the through-hole capacitor.

[0016] In some embodiments, the power supply module includes a first output terminal and a second output terminal, and the power supply filter module includes an LC filter network, and the LC filter network connects the first output terminal and the second output terminal with the RF module and the control module.

[0017] In some embodiments, the test equipment includes a heat dissipation component, which is located in the electrical cavity. The heat dissipation component includes an air guide and a heat dissipation fan. The air guide covers the RF module. The air guide is provided with an air inlet and an air outlet. The air inlet is arranged corresponding to the heat dissipation fan. The power supply filter module connects the power supply module and the heat dissipation fan.

[0018] In some embodiments, the power module is located above the air guide and connected to the air guide.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a schematic structural diagram of a test device according to an embodiment of the present invention;

[0022] Figure 2 is an exploded schematic diagram of a test device according to an embodiment of the present invention;

[0023] Figure 3 is a schematic structural diagram of an electrical cavity according to an embodiment of the present invention;

[0024] Figure 4 is a schematic structural diagram of a transmitter according to an embodiment of the present invention;

[0025] Figure 5 is a schematic structural diagram of a receiver according to an embodiment of the present invention;

[0026] Figure 6 is a schematic diagram of a module of a test device according to an embodiment of the present invention;

[0027] Figure 7 is a schematic diagram of the connection between the through-hole capacitor and the output end of the power module according to an embodiment of the present invention;

[0028] Figure 8 is another module schematic diagram of a testing device according to an embodiment of the present invention;

[0029] Figures 9 to 12 Schematic diagram of a circuit of an LC filter network according to an embodiment of the present invention.

[0030] Component Symbols:

[0031] Test equipment 100, test cavity 12, electrical cavity 14, RF module 18, antenna 20, test cavity 22, electrical cavity 24, base 26, control panel 28, door 30, opening 32, plastic cavity 34, electromagnetic shielding layer 36, transmitter 38, receiver 40, first shell 42, second shell 44, power module 46, power filter module 48, control module 50, first output terminal 52, second output terminal 54, through-hole capacitor 56, center through hole 58, LC filter network 60, heat dissipation assembly 62, air guide 64, heat dissipation fan 66, air inlet 68, air outlet 70. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and the embodiments of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] In the description of the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0035] The disclosure below provides many different embodiments or examples for realizing different structures of embodiments of the present invention. In order to simplify the disclosure of embodiments of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the present invention. In addition, embodiments of the present invention may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, embodiments of the present invention provide examples of various specific processes and materials, but those of ordinary skill in the art may appreciate the application of other processes and / or the use of other materials.

[0036] See also Figure 1 to Figure 2 A test device 100 according to an embodiment of the present invention includes a test cavity 12, an electrical cavity 14, a radio frequency module 18 and an antenna 20. A test cavity 22 is provided in the test cavity 12, and the test cavity 22 is used to accommodate the device under test. An electrical cavity 24 is provided in the electrical cavity 14, and the electrical cavity 24 is separated from the test cavity 22, and the electrical cavity 14 is an electromagnetic shielding cavity. The radio frequency module 18 is used to output radio frequency signals, and the radio frequency module 18 is located in the electrical cavity 24. The antenna 20 is electrically connected to the radio frequency module 18, and the antenna 20 is used to feed the radio frequency signal into the test cavity 22 and to conduct the electromagnetic waves radiated by the device under test to the radio frequency module 18.

[0037] In the above-mentioned test equipment 100, the electrical cavity 14 is an electromagnetic shielding cavity, and the RF module 18 is located in the electrical cavity 24. The electrical cavity 14 can prevent the electromagnetic interference generated by the RF module 18 when working from radiating outside the electrical cavity 14, prevent noise spillover, reduce electromagnetic interference during the test process, and improve the accuracy of the test results.

[0038] Specifically, in Figure 1 In the embodiment, the electrical cavity 14 is located above the test cavity 12. The RF module 18 is located in the electrical cavity 24. Figure 2In the embodiment, the test device 100 further includes a base 26, and the antenna 20 can be mounted on the base 26. Optionally, the antenna 20 can extend into the test cavity 22 in whole or in part. A portion of the antenna 20 can extend into the test cavity 22, and another portion can be located in the electrical cavity 24. The antenna 20 can be various types of antennas 20 such as an array antenna 20, which are not specifically limited here. The number of antennas 20 can be one, two, or more than two, which are not specifically limited here. Optionally, the antenna 20 is a broadband antenna 20.

[0039] The electrical cavity 14 is an electromagnetic shielding cavity, so that the electromagnetic interference generated by the relevant components located in the electrical cavity 24, such as the RF module 18, cannot be radiated outside the test cavity 12 when working, or most of the electromagnetic interference cannot be radiated outside the test cavity 12, preventing noise overflow and thus reducing or avoiding adverse effects on the device under test, which can improve the accuracy of the test results.

[0040] The test device 100 of the embodiment of the present invention can perform an electromagnetic compatibility (EMC) test on the device under test, and the EMC test may include an EMS (Electro-Magnetic Susceptibility) test and an EMI (Electro-Magnetic Interference) test. The device under test may include but is not limited to a control panel, a display screen, a chip, a circuit board or an electronic device, which is not specifically limited here.

[0041] During the EMS test, the DUT is placed in the test chamber 22, the DUT is started, the RF module 18 outputs the RF signal, and the antenna 20 feeds the RF signal into the test chamber 22 to simulate the electromagnetic interference environment of the DUT and observe whether the DUT can work normally. The frequency, phase and power of the RF signal can be set separately. The RF signal includes but is not limited to the RF signal in the microwave frequency band.

[0042] During EMI testing, the device under test is placed in the test cavity 22, the device under test is started, and the device under test radiates electromagnetic waves into the test cavity 22. The antenna 20 conducts the electromagnetic waves radiated by the device under test to the RF module 18, and the RF module 18 analyzes the electromagnetic waves to obtain the corresponding spectrum.

[0043] exist Figure 2In the embodiment, the test device 100 further includes a control panel 28 installed above the test cavity 12, and the control panel 28 is electrically connected to the RF module 18. The control panel 28 can be installed on the front side of the electrical cavity 14. The control panel 28 can include operating components such as buttons and a touch screen, and the operator can set the parameters of the RF signal through the operating components, such as the frequency, phase, power, etc. of the RF signal, so as to generate a variety of RF signals within a certain frequency band, and can simulate the complex electromagnetic interference scenario of the device under test in the actual environment.

[0044] exist Figure 2 In the test device 100, the test device 100 also includes a door body 30. An opening 32 is provided on one side of the test cavity 22. The door body 30 is rotatably mounted at the opening 32 to open or close the opening 32. When the door body 30 opens the opening 32, the operator can take and place the test piece. When the door body 30 is closed, the test can be performed. The door body 30 is used to prevent the RF signal from leaking from the test cavity 22 to the outside of the test cavity 12, thereby improving the safety of the test process. Figure 1 In the embodiment, the electrical cavity 14 and the test cavity 12 are both in the shape of a rectangular parallelepiped. The shapes of the electrical cavity 14 and the test cavity 12 are not specifically limited in the present invention.

[0045] In some embodiments, the electrical cavity 14 is a metal cavity.

[0046] In this way, the electromagnetic shielding function of the electrical cavity 14 can be achieved.

[0047] Specifically, the electrical cavity 14 is a metal cavity. The electromagnetic interference radiated by the RF module 18 and other components when they are working can be shielded by the metal cavity in the electrical cavity 24. Furthermore, the metal cavity can be connected to the ground end to guide away the electromagnetic interference radiated by the RF module 18 and other components when they are working, avoid heating of the metal cavity, and improve the reliability of the test equipment 100.

[0048] In some examples, the material of the metal cavity may include but is not limited to iron, stainless steel, aluminum alloy, etc.

[0049] In certain embodiments, see Figure 3 The electrical cavity 14 includes a plastic cavity 34 and an electromagnetic shielding layer 36 , and the electromagnetic shielding layer 36 covers the outer surface and / or the inner surface of the plastic cavity 34 .

[0050] In this way, the cost of the testing device 100 can be reduced while achieving the electromagnetic shielding function of the electrical cavity 14 .

[0051] Specifically, the electromagnetic shielding layer 36 covers the outer surface and / or inner surface of the plastic cavity 34. The electromagnetic shielding layer 36 can shield the electromagnetic interference radiated by components such as the RF module 18 when they are working, prevent noise overflow, reduce or avoid the adverse effects of electromagnetic interference in the electrical cavity 24 on the device under test in the test cavity 22, and improve the accuracy of the test results.

[0052] In one embodiment, the electromagnetic shielding layer 36 covers the outer surface of the plastic cavity 34. In one embodiment, the electromagnetic shielding layer 36 covers the inner surface of the plastic cavity 34. In one embodiment, the electromagnetic shielding layer 36 covers the outer surface and the inner surface of the plastic cavity 34.

[0053] The electromagnetic shielding layer 36 covers the outer surface and / or inner surface of the plastic cavity 34. The electromagnetic shielding layer 36 may cover the entire outer surface, the entire inner surface, part of the outer surface, or part of the inner surface of the plastic cavity 34. This is not specifically limited here. Preferably, when the electromagnetic shielding layer 36 covers part of the outer surface and the inner surface, the covered surface is the surface of the plastic cavity 34 close to the test cavity 22. For example, see Figure 1 The electrical cavity 14 is located above the test cavity 12 , and the electromagnetic shielding layer 36 can cover the outer surface and / or inner surface of the bottom plate of the plastic cavity 34 .

[0054] The electromagnetic shielding layer 36 covers the outer surface and / or inner surface of the plastic cavity 34 . The plastic cavity 34 is lower in cost than a metal cavity, thereby reducing the cost of the testing device 100 .

[0055] The electromagnetic shielding layer 36 may be a metal layer or other electromagnetic shielding layer 36 , which is not specifically limited herein.

[0056] In some embodiments, the RF module 18 includes a transmitter 38 and a receiver 40 . The transmitter 38 includes a first shell 42 , and the receiver 40 includes a second shell 44 . The first shell 42 and the second shell 44 are electromagnetic shielding shells.

[0057] In this way, the RF module 18 also has a shielding structure design to further prevent noise from spilling out.

[0058] Specifically, the transmitter 38 is used to output a radio frequency signal in the EMS test. The transmitter 38 may include a signal generating circuit, an incident power detection circuit, and a reflected power detection circuit. The signal generating circuit, the incident power detection circuit, and the reflected power detection circuit may be located in the first housing 42. The signal generating circuit may include components such as a crystal oscillator, an amplifier, a circulator, and a phase shifter. The incident power detection circuit is used to detect the power of the radio frequency signal incident into the test cavity 22. The radio frequency module 18 may adjust the radio frequency signal output by the signal generating circuit according to the data fed back by the incident power detection circuit, so that the power of the radio frequency signal incident into the test cavity 22 is close to the target power (set power) or equal to the target power.

[0059] The reflected power detection circuit is used to detect the power of the RF signal reflected by the test cavity 22. The RF module 18 can determine the energy of the RF signal absorbed by the DUT based on the data fed back by the incident power detection circuit and the reflected power detection circuit.

[0060] The first shell 42 is an electromagnetic shielding shell, so that the electromagnetic interference generated by the relevant components located in the first shell 42, such as the signal generating circuit, the incident power detection circuit and the reflected power detection circuit, cannot be radiated outside the electrical cavity 14, or most of them cannot be radiated outside the electrical cavity 14, thereby preventing noise overflow and thus reducing or avoiding the electromagnetic interference radiated by the transmitter 38 from entering the test cavity 22 and causing adverse effects on the device under test, thereby improving the accuracy of the test results.

[0061] The receiver 40 is used to receive the electromagnetic waves radiated by the device under test and conducted by the antenna 20 during EMI testing, and analyze the electromagnetic waves radiated by the device under test to obtain a corresponding frequency spectrum.

[0062] The receiver 40 may include but is not limited to components such as a digital link unit, an analog-to-digital converter, a mixer, and a detector tube. The digital link unit, the analog-to-digital converter, the mixer, the detector tube, and other components may be located in the second housing 44. The second housing 44 is an electromagnetic shielding housing, so that the electromagnetic interference generated by the relevant components located in the second housing 44, such as the digital link unit, the analog-to-digital converter, the mixer, and the detector tube during operation cannot be radiated outside the electrical cavity 14, or most of them cannot be radiated outside the electrical cavity 14, thereby preventing noise from overflowing and thus reducing or avoiding the electromagnetic interference radiated by the receiver 40 from entering the test cavity 22 and causing adverse effects on the device under test, thereby improving the accuracy of the test results.

[0063] In one embodiment, the electromagnetic shielding shell may be a metal shell. In one embodiment, the electromagnetic shielding shell includes a plastic shell and an electromagnetic shielding layer, and the electromagnetic shielding layer covers the outer surface and / or the inner surface of the plastic shell.

[0064] In certain embodiments, see Figure 6The test device 100 includes a power module 46 and a power filter module 48 , and the power filter module 48 connects the power module 46 and the RF module 18 .

[0065] In this way, it is possible to reduce or prevent the noise generated by the power module 46 from being transmitted to the RF module 18 and affecting the normal operation of the RF module 18 .

[0066] Specifically, the RF module 18 is powered by the power module 46. The power module 46 can output direct current or alternating current as required. Since the RF module 18 outputs a radio frequency signal, which is sensitive to noise, the power filter module 48 connects the power module 46 and the RF module 18. The power filter module 48 can filter the noise generated when the power module 46 is working, prevent the noise from overflowing, and avoid the noise generated when the power module 46 is working from being transmitted to the RF module 18 and affecting the RF signal from being output with the set parameters.

[0067] In certain embodiments, see Figure 6 The test device 100 includes a control module 50 , a power filter module 48 , a power module 46 and a control module 50 .

[0068] In this way, it is possible to reduce or prevent the noise generated by the power module 46 from being transmitted to the control module 50 and affecting the normal operation of the control module 50 .

[0069] Specifically, the control module 50 may include a control component such as a controller. The control module 50 is powered by the power module 46. The power module 46 may output direct current or alternating current as required. The control module 50 may control the operation of the test device 100, including but not limited to the start and end of the EMC test, the generation and output of control signals, the start and stop of related functions, etc. The control module 50 may be installed on the control panel 28. The power filter module 48 connects the power module 46 and the control module 50. The power filter module 48 may filter the noise generated when the power module 46 is working, prevent the noise from spilling out, and avoid the noise generated when the power module 46 is working from being conducted to the control module 50 and affecting the normal operation of the control module 50.

[0070] In certain embodiments, see Figure 7 The power module 46 includes a first output terminal 52 and a second output terminal 54. The power filter module 48 includes a through-hole capacitor 56. The through-hole capacitor 56 has a central through hole 58. The first output terminal 52 passes through the central through hole 58 and is tightly connected to the hole wall of the central through hole 58. The second output terminal 54 is connected to the outer wall of the through-hole capacitor 56.

[0071] In this way, the through-hole capacitor 56 can be used to achieve filtering.

[0072] Specifically, the through-hole capacitor 56 can be processed by a ring filter chip. The through-hole capacitor 56 has a central through hole 58, and the hole wall of the central through hole 58 and the outer wall of the through-hole capacitor 56 are respectively two electrodes of the through-hole capacitor 56. The first output end 52 passes through the central through hole 58 and is in close contact with the hole wall of the central through hole 58, so that the first output end 52 is electrically connected to one of the electrodes of the through-hole capacitor 56.

[0073] The second output terminal 54 is connected to the outer side wall of the through-hole capacitor 56. The second output terminal 54 is electrically connected to the other electrode of the through-hole capacitor 56. The specific parameters of the through-hole capacitor 56 can be set according to the noise of each frequency band generated when the power module 46 is working. The noise of each frequency band generated when the power module 46 is working can be completely or partially filtered by the through-hole capacitor 56.

[0074] The present invention does not specifically limit the number of through-hole capacitors 56. Figure 7 In the example, the number of the through-hole capacitor 56 is one.

[0075] In certain embodiments, see Figures 8 to 12 The power module 46 includes a first output terminal 52 and a second output terminal 54 , and the power filter module 48 includes an LC filter network 60 , which connects the first output terminal 52 and the second output terminal 54 with the RF module 18 and the control module 50 .

[0076] In this way, filtering can be achieved using the LC filter network 60 .

[0077] For details, please refer to Fig. 9 In one embodiment, the LC filter network 60 includes a first capacitor C1 and a first inductor L1, one end of the first capacitor C1 is connected to the first output terminal 52 and one end of the first inductor L1, the other end of the first capacitor C1 is connected to the second output terminal 54, the RF module 18 and the control module 50, and the other end of the first inductor L1 is connected to the RF module 18 and the control module 50.

[0078] Please refer to Fig.10 In one embodiment, the LC filter network 60 includes a second capacitor C2 and a second inductor L2, one end of the second inductor L2 is connected to the first output terminal 52, and the other end of the second inductor L2 is connected to one end of the second capacitor C2, the RF module 18, and the control module 50. The other end of the second capacitor C2 is connected to the second output terminal 54, the RF module 18, and the control module 50.

[0079] Please refer to Fig.11In one embodiment, the LC filter network 60 includes a third capacitor C3, a third inductor L3 and a fourth inductor L4, one end of the third inductor L3 is connected to the first output terminal 52, the other end of the third inductor L3 is connected to one end of the third capacitor C3 and one end of the fourth inductor L4, and the other end of the fourth inductor L4 is connected to the RF module 18 and the control module 50. The other end of the third capacitor C3 is connected to the second output terminal 54, the RF module 18 and the control module 50.

[0080] Please refer to Fig.12 In one embodiment, the LC filtering network 60 includes a fourth capacitor C4, a fifth capacitor C5 and a fifth inductor L5, one end of the fifth inductor L5 is connected to the first output terminal 52 and one end of the fourth capacitor C4, the other end of the fifth inductor L5 is connected to one end of the fifth capacitor C5, the RF module 18 and the control module 50, the other end of the fourth capacitor C4 is connected to the second output terminal 54 and the other end of the fifth capacitor C5, and the other end of the fifth capacitor C5 is connected to the RF module 18 and the control module 50.

[0081] It is understood that in other embodiments, the LC filter network 60 may also include other connection modes of capacitors and inductors, and is not limited to Figures 9 to 12 Connection method shown.

[0082] In other implementations, the power filter module 48 may further include a shielding metal mesh.

[0083] In certain embodiments, see Figure 2 The test equipment 100 includes a heat dissipation component 62, which is located in the electrical cavity 24. The heat dissipation component 62 includes an air guide 64 and a heat dissipation fan 66. The air guide 64 covers the radio frequency module 18. The air guide 64 is provided with an air inlet 68 and an air outlet 70. The air inlet 68 is arranged corresponding to the heat dissipation fan 66. The power supply filter module 48 connects the power supply module 46 and the heat dissipation fan 66.

[0084] In this way, the normal operation of the heat dissipation fan 66 can be guaranteed.

[0085] Specifically, when the RF module 18 is working, the temperature rises quickly. If the temperature of the RF module 18 is high, it will affect the adjustment accuracy of the RF signal, and the RF signal of the required parameters cannot be obtained. The wind generated by the heat dissipation fan 66 when it is working blows into the air guide 64 to dissipate the heat of the RF module 18 in the air guide 64, ensuring that the RF module 18 works within a normal temperature range. The electrical cavity 14 is provided with a vent (not shown in the figure), and the air outlet 70 can face the vent. The hot air in the electrical cavity 24 can be dissipated to the outside of the electrical cavity 14 through the vent. A metal mesh (not shown in the figure) can be provided in the vent to prevent electromagnetic interference from overflowing.

[0086] The heat dissipation fan 66 is powered by the power module 46. For example, the power module 46 can provide direct current to the heat dissipation fan 66. The power filter module 48 can filter the noise generated by the power module 46 when it is working, prevent the noise from overflowing, and avoid the noise generated by the power module 46 when it is working from being transmitted to the heat dissipation fan 66 and affecting the normal operation of the heat dissipation fan 66. If the noise generated by the power module 46 when it is working is transmitted to the heat dissipation fan 66, the speed of the heat dissipation fan 66 will be abnormal, and it will not be able to provide sufficient air volume for the RF module 18 to dissipate heat, causing the RF signal output by the RF module 18 to deviate from the expected value.

[0087] In some embodiments, the power module 46 is located above the air guide 64 and connected to the air guide 64 .

[0088] In this way, the power module 46 can be cooled to ensure that the power module 46 operates within a normal temperature range.

[0089] Optionally, the power module 46 can be connected to the air guide 64 via thermal conductive adhesive. The power module 46 can transfer heat to the air guide 64 via the thermal conductive adhesive. The heat is dissipated from the surface of the air guide 64, and the wind in the internal flow channel of the air guide 64 is used to take the heat away, thereby improving the heat dissipation efficiency of the power module 46.

[0090] Optionally, a socket (not shown) is further provided in the test cavity 22, and the power module 46 can also be electrically connected to the socket in the test cavity 22, and the power plug of the device under test can be inserted into the socket, so that the power module 46 can provide the device under test with the electrical energy (DC and / or AC) required for operation, so that the device under test can work, thereby performing EMC testing on the device under test.

[0091] In summary, the test equipment 100 of the present invention can be used as a micro darkroom. An electrical cavity 24 is reserved at the top of the micro darkroom, and the RF module 18 is located in the electrical cavity 24. The transmitter 38 and the receiver 40 themselves will generate noise, and are close to the test cavity 22 below, which can easily interfere with the test results of the device under test. Therefore, the electrical cavity 14 adopts an electromagnetic shielding cavity to prevent or reduce noise spillover, ensure that the test results are not interfered with, and improve the accuracy of the test results.

[0092] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0093] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A testing device, characterized in that: include: A test cavity, wherein a test cavity is provided in the test cavity, and the test cavity is used to accommodate the tested object; An electrical cavity, wherein an electrical cavity is provided in the electrical cavity, the electrical cavity is separated from the test cavity, and the electrical cavity is an electromagnetic shielding cavity; A radio frequency module, the radio frequency module is used to output a radio frequency signal, and the radio frequency module is located in the electrical cavity; An antenna is electrically connected to the radio frequency module, and is used to feed the radio frequency signal into the test cavity and to conduct the electromagnetic waves radiated by the device under test to the radio frequency module.

2. The test device according to claim 1, characterized in that The electrical cavity is a metal cavity.

3. The testing device according to claim 1, characterized in that The electrical cavity comprises a plastic cavity and an electromagnetic shielding layer, wherein the electromagnetic shielding layer covers the outer surface and / or the inner surface of the plastic cavity.

4. The testing device according to claim 1, characterized in that The radio frequency module includes a transmitter and a receiver, the transmitter includes a first shell, the receiver includes a second shell, and the first shell and the second shell are electromagnetic shielding shells.

5. The testing device according to claim 1, characterized in that The testing device comprises a power supply module and a power supply filter module, and the power supply filter module is connected to the power supply module and the radio frequency module.

6. The testing device according to claim 5, characterized in that The testing device comprises a control module, the power supply filter module, the power supply module and the control module.

7. The testing device according to claim 6, characterized in that The power supply module includes a first output terminal and a second output terminal, the power supply filter module includes a through-hole capacitor, the through-hole capacitor has a central through hole, the first output terminal passes through the central through hole and is in close contact with the hole wall of the central through hole, and the second output terminal is connected to the outer wall of the through-hole capacitor.

8. The testing device according to claim 6, characterized in that The power supply module includes a first output end and a second output end, and the power supply filter module includes an LC filter network. The LC filter network connects the first output end and the second output end with the RF module and the control module.

9. The testing device according to claim 5, characterized in that The testing equipment includes a heat dissipation component, which is located in the electrical cavity. The heat dissipation component includes an air guide and a heat dissipation fan. The air guide covers the radio frequency module. The air guide is provided with an air inlet and an air outlet. The air inlet is arranged corresponding to the heat dissipation fan. The power supply filter module connects the power supply module and the heat dissipation fan.

10. The testing device according to claim 9, characterized in that The power module is located above the air guide and connected to the air guide.

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