Testing device

Abstract

The testing device comprises a testing cavity, an antenna assembly, a radio frequency module, a radio frequency detection module and a controller, the testing cavity is arranged in the testing cavity and used for placing the tested piece, the radio frequency module is electrically connected with the antenna assembly and used for outputting a radio frequency signal, and the radio frequency detection module is electrically connected with the antenna assembly and used for detecting the electromagnetic immunity of the tested piece. The antenna assembly is used for feeding a radio frequency signal into the test cavity, the radio frequency detection module is used for collecting an electromagnetic signal of the position where the tested piece is located and converting the electromagnetic signal into an electric signal parameter, and the controller is electrically connected with the radio frequency detection module and used for recording the electric signal parameter. In the test device, the radio frequency detection module collects the electromagnetic signal of the position of the tested piece and converts the electromagnetic signal into the electric signal parameter, and the controller records the electric signal parameter of the position of the tested piece, so that the electromagnetic information of the position of the tested piece can be accurately obtained, and the accuracy of a test result is improved.

Description

Technical Field

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

[0002] Currently, many signals such as mobile phone communications and WIFI are concentrated in the microwave band. The strength of electromagnetic signals in daily environments is hundreds or even thousands of times higher than in the past. This means that many electronic devices need to consider not only the stability of the device itself, but also its working stability in an environment with electromagnetic signal interference, which corresponds to the electromagnetic susceptibility (EMS) of the device. Therefore, it is necessary to perform EMS testing on components of electronic devices, such as chips, display screens, buttons, etc. During the test, the specific power or electromagnetic field strength of the location of the device under test is often uncertain, and it is impossible to accurately determine how much electromagnetic radiation the device under test receives, resulting in 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 provided in an embodiment of the present invention is used to test the electromagnetic immunity of a device under test, and the testing device comprises:

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

[0006] Antenna assembly;

[0007] A radio frequency module, the radio frequency module is electrically connected to the antenna assembly, the radio frequency module is used to output a radio frequency signal, and the antenna assembly is used to feed the radio frequency signal into the test cavity;

[0008] A radio frequency detection module, the radio frequency detection module is used to collect electromagnetic signals at the position of the measured object and convert the electromagnetic signals into electrical signal parameters, and;

[0009] A controller is electrically connected to the radio frequency detection module, and is used to record the electrical signal parameters.

[0010] In the above test device, the RF detection module collects the electromagnetic signal at the location of the device under test and converts the electromagnetic signal into electrical signal parameters. The controller records the electrical signal parameters at the location of the device under test, thereby accurately obtaining the electromagnetic information at the location of the device under test and improving the accuracy of the test results.

[0011] In some embodiments, the radio frequency detection module includes a detection antenna, and the detection antenna is installed on the bottom wall of the test cavity, so as to improve the accuracy of the radio frequency signal detection.

[0012] In some embodiments, the radio frequency detection module includes a plurality of detection antennas, and the plurality of detection antennas are spaced apart to form a test area, and the device under test is located in the test area, so that the accuracy of the radio frequency signal detection can be improved.

[0013] In some embodiments, the radio frequency detection module includes a detection circuit, the input end of the detection circuit is connected to one end of the detection antenna, and the output end of the detection circuit is connected to the controller, so that electromagnetic radiation can be converted into electrical signal parameters.

[0014] In some embodiments, the radio frequency detection module includes a signal processing circuit, the output end of the detection circuit is connected to the input end of the signal processing circuit, the output end of the signal processing circuit is connected to the controller, and the signal processing circuit is used to process the output signal of the detection circuit into an electrical signal parameter that can be recognized by the controller. In this way, the adaptability of the radio frequency detection module can be improved.

[0015] In some embodiments, the detection circuit includes a DC blocking capacitor and a detector, one end of the DC blocking capacitor is connected to one end of the detection antenna, the other end of the DC blocking capacitor is connected to the input end of the detector, and the output end of the detector is connected to the input end of the controller or the signal processing circuit. In this way, the detection circuit can be protected.

[0016] In some embodiments, the electrical signal parameter includes a voltage, and the radio frequency detection module includes a regulating circuit, the regulating circuit is connected to the output end of the detector, and the regulating circuit is used to adjust the voltage output by the detector. In this way, the output voltage of the detector can be adjusted to a suitable range.

[0017] In some embodiments, the radio frequency detection module includes an attenuator, the input end of the attenuator is connected to one end of the detection antenna, and the output end of the attenuator is connected to the input end of the detection circuit, so that the detection circuit can be protected.

[0018] In some embodiments, the radio frequency module includes a transmitter, and the controller is used to reduce the power of the transmitter when the electrical signal parameter is greater than a first preset threshold, and to increase the power of the transmitter when the electrical signal parameter is less than a second preset threshold, and the first preset threshold is greater than the second preset threshold. In this way, the accuracy of the adjustment test result can be improved.

[0019] In some embodiments, the electrical signal parameter includes at least one of voltage, power and electric field strength, so that the controller can be better adapted.

[0020] 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

[0021] 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:

[0022] Figure 1 is a schematic structural diagram of a testing device according to an embodiment of the present invention;

[0023] Figure 2 is an exploded schematic diagram of a testing device according to an embodiment of the present invention;

[0024] Figure 3 is a schematic structural diagram of a test chamber according to an embodiment of the present invention;

[0025] Figure 4 is a schematic diagram of the composition of a radio frequency detection module according to an embodiment of the present invention;

[0026] Figure 5 is another schematic diagram of the composition of the radio frequency detection module according to an embodiment of the present invention;

[0027] Figure 6 Schematic diagram of an equivalent circuit of a radio frequency detection module according to an embodiment of the present invention.

[0028] Description of main component symbols:

[0029] Test equipment-100, test cavity-10, test cavity-11, door body-12, test area-13, antenna assembly-20, RF module-30, RF detection module-40, detection antenna-41, attenuator-42, detection circuit-43, DC blocking capacitor-431, detector-432, adjustment circuit-44, voltage divider resistor-441, adjustment capacitor-442, signal processing circuit-45, controller-50, power supply module-60, air guide cover-70, heat dissipation fan-80, control panel-90. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having 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.

[0031] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] 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" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples 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.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description 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 or an electrical connection. 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 present invention can be understood according to specific circumstances.

[0037] See also Figure 1 and Figure 2 A test device 100 according to an embodiment of the present invention is used to test the electromagnetic immunity of a device under test (not shown). The test device 100 includes a test cavity 10, an antenna assembly 20, a radio frequency module 30, a radio frequency detection module 40 and a controller 50. A test cavity 11 is provided in the test cavity 10. The test cavity 11 is used to place the device under test. The radio frequency module 30 is electrically connected to the antenna assembly 20. The radio frequency module 30 is used to output a radio frequency signal. The antenna assembly 20 is used to feed the radio frequency signal into the test cavity 11. The radio frequency detection module 40 is used to collect electromagnetic signals at the location of the device under test and convert the electromagnetic signals into electrical signal parameters. The controller 50 is electrically connected to the radio frequency detection module 40. The controller 50 is used to record electrical signal parameters.

[0038] In the above-mentioned test device 100, the radio frequency detection module 40 collects the electromagnetic signal at the location of the device under test and converts the electromagnetic signal into electrical signal parameters. The controller 50 records the electrical signal parameters at the location of the device under test, thereby accurately obtaining the electromagnetic information at the location of the device under test and improving the accuracy of the test results.

[0039] In one embodiment, when the RF module 30 outputs an RF signal and feeds the RF signal into the test cavity 11 through the antenna assembly 20, the RF signal can form an electromagnetic interference environment in the test cavity 11. The frequency band of the RF signal includes but is not limited to the microwave frequency band. The test cavity 11 is used to place the device under test. The device under test includes but is not limited to chips, circuit boards, display screens, etc. In an electromagnetic interference environment, if the electromagnetic interference resistance of the device under test does not meet the requirements, the device under test will show abnormal conditions such as screen flickering, screen distortion, abnormal temperature, program crash, button mis-triggering, or abnormal sound, so that the design scheme with poor electromagnetic interference resistance can be screened out through the abnormal state and the device under test can be improved according to the abnormal state.

[0040] The antenna assembly 20 can be placed entirely in the test cavity 10, or a portion can be placed in the test cavity 10 and the other portion can be located outside the test cavity 10, which is not limited here. The RF module 30 can output RF signals at a certain power, phase and frequency, and by changing the output power, frequency or phase of the RF module 30, the working state of the device under test in different electromagnetic interference environments can be tested. However, due to the reflection of the test cavity 10 or the presence of electromagnetic interference generated by other functional modules, the electromagnetic signal received by the device under test is not equivalent to the RF signal emitted by the RF module 30. Therefore, the RF signal of the RF module 30 cannot accurately reflect the electromagnetic signal received by the device under test. By detecting the electromagnetic signal at the location of the device under test through the RF detection module 40, the electromagnetic signal received by the device under test can be more truly and accurately reflected, thereby improving the test accuracy.

[0041] The RF detection module 40 can obtain the intensity of the electromagnetic field or the radiation power value from the electromagnetic signal. The RF detection module 40 can also convert the electromagnetic signal into an electrical signal parameter that can be recognized by the controller 50, and record the electrical signal parameter through the controller 50, so as to facilitate the tester to adjust the design scheme of the device under test according to the electrical signal parameter. In another embodiment, the RF detection module 40 can be a field strength monitoring module, and the field strength monitoring module outputs the electrical signal parameter by identifying the magnitude of the reflected electromagnetic field intensity in the test cavity 11. In some other embodiments, the controller 50 can also control the RF module 30 to complete the test process according to a pre-set program. For example, in a test, in order to know the working state of the device under test at the target radiation power value, the RF module 30 can be controlled to transmit the RF signal with the initial power. When the RF detection module 40 detects that the power of the electromagnetic signal is significantly different from the target radiation power value, the controller 50 can adjust the output power of the RF module 30 so that the power of the electromagnetic signal is the same as the target radiation power value or the difference between the two is within a preset range, thereby completing the test process.

[0042] Also, see Figure 2In some embodiments, the test chamber 10 further includes a door 12. An opening is provided on one side of the test chamber 10. The door 12 is rotatably mounted at the opening to open or close the opening. When the door 12 is opened, the tester can take and place the test piece. When the door 12 is closed, the test can be performed. The door 12 is used to prevent the radio frequency signal from leaking from the test chamber 11 into the air, thereby improving the safety of the test process.

[0043] The material of the test cavity 10 is a material that has the function of shielding the propagation of electromagnetic waves, so as to avoid the leakage of electromagnetic waves when detecting the test piece, and further avoid the adverse effects of electromagnetic waves on nearby testers. The test cavity 10 can be a test cavity 10 made of metal material, or a test cavity 10 with a metal layer on the surface of a plastic material, which is not limited here. The test cavity 10 made of metal material is strong and durable; the test cavity 10 with a metal layer on the surface of a plastic material is light in weight, low in cost, and easy to move. The material of the test cavity 10 and the wall of the entire test device 100 can be selected according to actual conditions, which is not limited here.

[0044] In other embodiments, the test device 100 further includes a power supply module 60, which can supply power to the RF module 30, the controller 50 and the device under test. In the working state, the temperature of the RF module 30 rises quickly. When the temperature of the RF module 30 is high, the internal components of the RF module 30 are affected by the high temperature, and the accuracy of regulating the RF signal will be reduced. Therefore, an air guide 70 and a heat dissipation fan 80 can be set in the test device 100, so that when the temperature of the RF module 30 exceeds the temperature threshold, the heat dissipation fan 80 is started to dissipate heat from the RF module 30 to ensure the accuracy of the RF module 30 in regulating the RF signal. At the same time, it can also avoid the components of the RF module 30 from aging too quickly due to excessive temperature, thereby reducing its failure rate and extending the service life of the RF module 30. The heat dissipation fan 80 can provide wind when it is working. The wind blown by the heat dissipation fan 80 enters the interior of the air guide 70, which can take away the heat of the RF module 30 and cool it down. The heat dissipation fan 80 includes but is not limited to a centrifugal fan, a cross-flow fan, an axial flow fan, and a mixed flow fan. The number of the heat dissipation fans 80 may be one, two or more than two, which is not limited here. Optionally, the air guide cover 70 may be a metal part. Of course, the air guide cover 70 and the heat dissipation fans 80 may also dissipate heat for the power supply module 60.

[0045] In some other embodiments, the test device 100 may further include a control panel 90. The tester may control the start or stop of the test through the control panel 90. The control panel 90 may also display the parameters of the current RF signal, and the parameters of the RF signal may be modified through the operation area on the control panel 90 to adjust the RF signal. The control panel 90 may also be powered by the power supply module 60.

[0046] See also Figure 2 and Figure 3 In some embodiments, the radio frequency detection module 40 includes a detection antenna 41 . The detection antenna 41 is installed on the bottom wall of the test cavity 11 .

[0047] In this way, the accuracy of radio frequency signal detection can be improved.

[0048] Specifically, see Figure 2 and Figure 3 In one embodiment, the RF detection module 40 can receive electromagnetic signals through the detection antenna 41. The detection antenna 41 can respond to the electromagnetic signal and form an induced voltage. The stronger the electromagnetic signal, the greater the induced voltage. According to the change of the induced voltage, the RF detection module 40 can output electrical signal parameters accordingly. During the test, the device under test is placed on the bottom wall of the test cavity 11, and the detection antenna 41 is also installed on the bottom wall of the test cavity 11 so that the detection antenna 41 can be set close to the device under test, so as to obtain more accurate electromagnetic signals. The detection antenna 41 can be integrated inside the RF detection module 40 and placed on the bottom wall of the test cavity 11, or it can be placed separately on the bottom wall of the test cavity 11.

[0049] In another embodiment, a glass-ceramic plate can be placed on the bottom wall of the test cavity 11, and the glass-ceramic plate can allow electromagnetic signals to pass through. The device under test can be placed on the glass-ceramic plate, and the detection antenna 41 can be placed under the glass-ceramic plate, so that the detection antenna 41 can receive the electromagnetic signal of the device under test through the glass-ceramic plate. The detection antenna 41 can be in the form of a microstrip, or it can be an integrated structure with the glass-ceramic plate.

[0050] See also Figure 2 and Figure 3 In some embodiments, the radio frequency detection module 40 includes a plurality of detection antennas 41. The plurality of detection antennas 41 are spaced apart to form a test area 13. The device under test is located in the test area 13.

[0051] In this way, the accuracy of radio frequency signal detection can be improved.

[0052] Specifically, see Figure 2 and Figure 3In one embodiment, a plurality of detection antennas 41 may be arranged in a circular pattern around the object to be tested, or may be arranged in a square pattern around the object to be tested, and their shapes may correspond to the appearance of the object to be tested. Of course, a plurality of detection antennas 41 may also be movably arranged, and after the object to be tested is placed in the test area 13 of the test cavity 11, the detection antenna 41 may adjust the enclosed shape accordingly, or may movably reduce the distance between the detection antenna 41 and the object to be tested, so as to improve the accuracy of obtaining electromagnetic signals. The detection antenna 41 may be automatically adjusted by the test device 100, or may be manually adjusted by the tester. When a plurality of detection antennas 41 receive electromagnetic signals, electrical signal parameters may be outputted correspondingly according to the average value of the received electromagnetic signals.

[0053] See also Figure 4 In some embodiments, the radio frequency detection module 40 includes a detection circuit 43. An input end of the detection circuit 43 is connected to one end of the detection antenna 41. An output end of the detection circuit 43 is connected to the controller 50.

[0054] In this way, electromagnetic radiation can be converted into electrical signal parameters.

[0055] Specifically, see Figure 4 In one embodiment, after the detection antenna 41 receives the electromagnetic signal, the detection circuit 43 can detect the induced voltage or induced current transmitted by the detection antenna 41, and output the electrical signal parameters that can be recognized by the controller 50 accordingly. There is a one-to-one mapping relationship between the electrical signal parameters and the electromagnetic signal, so that the strength of the electromagnetic signal received by the device under test can be determined according to the electrical signal parameters and the mapping relationship recorded by the controller 50. In addition, the detection circuit 43 can output the electrical signal parameters according to time periods. For example, the detection circuit 43 can obtain an electromagnetic signal once every 10ms and output the electrical signal parameters once. The detection circuit 43 can also obtain an electromagnetic signal once every 10ms, and output the electrical signal parameters corresponding to the average value of the electromagnetic signal obtained in the time period once in a fixed time period. The fixed time period can be 1s.

[0056] In another embodiment, the detection circuit 43 can also identify information on no-load and load states, so that the output of the RF module 30 can be turned off or reduced when the test device 100 is no-load or ignited, and the tester can be prompted to avoid fire accidents.

[0057] See also Figure 5 In some embodiments, the radio frequency detection module 40 includes a signal processing circuit 45. The output end of the detection circuit 43 is connected to the input end of the signal processing circuit 45. The output end of the signal processing circuit 45 is connected to the controller 50, and the signal processing circuit 45 is used to process the output signal of the detection circuit 43 into an electrical signal parameter that can be recognized by the controller 50.

[0058] In this way, the adaptability of the radio frequency detection module 40 can be improved.

[0059] Specifically, see Figure 5 In one embodiment, the detection circuit 43 may also output a preprocessing signal, and further convert the preprocessing signal into an electrical signal parameter through the signal processing circuit 45. For example, the detection circuit 43 may convert the electromagnetic signal into a preprocessing signal in the form of voltage information, and the signal processing circuit 45 inputs the preprocessing signal, and may further output a TTL (Transistor-Transistor Logic) level, a rising edge or falling edge signal to the controller 50, or may output an electrical signal parameter of a digital signal or an analog signal for identifying the electromagnetic signal, and send it to the controller 50. The signal processing circuit 45 may improve the diversity of the output of the radio frequency detection module 40 to adapt to different controllers 50. In another embodiment, the signal processing circuit 45 may include algorithmic processing of valid signals and algorithmic processing of useless signals. The signal processing circuit 45 may set an effective threshold value, and improve the output accuracy by discarding abnormal electromagnetic signals whose intensity is lower than the effective threshold value. In another embodiment, the signal processing circuit 45 may process the preprocessing signal through an operational amplifier, a comparator, or a digital to analog converter (DAC, Digital to Analog Converter).

[0060] See also Figure 6 In some embodiments, the detection circuit 43 includes a DC blocking capacitor 431 and a detector 432. One end of the DC blocking capacitor 431 is connected to one end of the detection antenna 41. The other end of the DC blocking capacitor 431 is connected to the input end of the detector 432. The output end of the detector 432 is connected to the controller 50.

[0061] In this way, the detection circuit 43 can be protected.

[0062] Specifically, see Figure 6 In one embodiment, the detection antenna 41 can receive electromagnetic signals and transmit the electromagnetic signals to the detection circuit 43 in the form of induced voltage or induced current. The output signal of the detection antenna 41 can be either a DC signal or an AC signal. The detection circuit 43 can block the DC signal through the DC blocking capacitor 431 and only allow the AC signal to pass through the detector 432, thereby avoiding DC interference and protecting the detector 432. The detector 432 can also convert the received AC signal into a DC voltage and transmit the electrical signal parameters to the controller 50 in the form of voltage. Figure 5 As shown, in another embodiment, the DC voltage output by the detector 432 can also be converted into electrical signal parameters in the form of power or digital signals through the signal processing circuit 45, and then the electrical signal parameters are transmitted to the controller 50 through the signal processing circuit 45.

[0063] See also Figure 6 In some embodiments, the electrical signal parameter includes a voltage. The radio frequency detection module 40 includes an adjustment circuit 44. The adjustment circuit 44 is connected to the output end of the detector 432. The adjustment circuit 44 is used to adjust the voltage output by the detector 432.

[0064] In this way, the output voltage of the detector 432 can be adjusted to be within a suitable range.

[0065] Specifically, see Figure 6 In one embodiment, the detector 432 can output electrical signal parameters to the controller 50 in the form of voltage, and the controller 50 can save the electrical signal parameters. The output voltage of the detector 432 is proportional to the strength of the electromagnetic signal. When the electromagnetic signal is weak, the output voltage of the detector 432 is small. The output voltage of the detector 432 can be increased by the adjustment circuit 44 to avoid a large detection error caused by a small output voltage. In addition, when the output voltage of the detector 432 is too large, the adjustment circuit 44 can also lower the output voltage so that the output voltage is within a suitable range. In another embodiment, the adjustment circuit 44 can adjust the output voltage of the detector 432 through a voltage divider resistor 441 and an adjustment capacitor 442.

[0066] See also Figure 5 In some embodiments, the radio frequency detection module 40 includes an attenuator 42. An input end of the attenuator 42 is connected to one end of the detection antenna 41. An output end of the attenuator 42 is connected to an input end of a detection circuit 43.

[0067] In this way, the detection circuit 43 can be protected.

[0068] Specifically, see Figure 5 In one embodiment, the detector circuit 43 has a maximum input power. When the detector 432 receives an electromagnetic signal with an intensity exceeding the maximum input power, the detector 432 will be damaged. Therefore, the input power can be reduced by the attenuator 42 to protect the detector circuit 43. The maximum input power can be determined according to the model of the detector 432. The maximum receiving power of the detector 432 can be determined according to the transmission power of the RF module 30 and the gain and directivity of the antenna assembly 20. The attenuation ratio required by the attenuator 42 can be determined according to the maximum receiving power and the maximum input power. The attenuator 42 may include, but is not limited to, a coaxial attenuator, a patch attenuator, and a microstrip attenuator.

[0069] See also Figure 2In some embodiments, the radio frequency module 30 includes a transmitter. The controller 50 is configured to reduce the power of the transmitter when the electrical signal parameter is greater than a first preset threshold value. When the electrical signal parameter is less than a second preset threshold value, the power of the transmitter is increased. The first preset threshold value is greater than the second preset threshold value.

[0070] In this way, the accuracy of the test results can be improved.

[0071] Specifically, see Figure 2 In one embodiment, the RF module 30 can control the transmitter to output the required RF signal according to the input parameters of the tester.

[0072] The RF detection module 40 can obtain the RF signal fed into the test cavity 11 and convert it into electrical signal parameters. The controller 50 compares the electrical signal parameters obtained by the RF detection module 40 with the first preset threshold and the second preset threshold.

[0073] When the electrical signal parameter is greater than the first preset threshold, it indicates that the power of the RF signal is large, and the electromagnetic interference intensity received by the device under test may exceed the intensity required for the test, thereby causing the test result to be inconsistent with expectations. By reducing the power of the transmitter so that the electrical signal parameter is less than or equal to the first preset threshold, the device under test can receive the electromagnetic interference intensity required for the test to complete the test, thereby improving the accuracy of the test results.

[0074] When the electrical signal parameter is less than the second preset threshold, it indicates that the power of the RF signal is too small to form an effective electromagnetic interference environment for the device under test, which will also cause the test result to be inconsistent with expectations. By increasing the power of the transmitter until the electrical signal parameter is greater than or equal to the second preset threshold, the device under test can receive effective electromagnetic interference to complete the test, thereby improving the accuracy of the test results.

[0075] In another embodiment, the transmitter may be composed of components such as a crystal oscillator, an amplifier, a circulator, and a phase shifter.

[0076] In some embodiments, the electrical signal parameter includes at least one of voltage magnitude, power magnitude, and electric field strength magnitude.

[0077] In this way, the controller 50 can be better adapted.

[0078] Specifically, in one embodiment, the RF detection module 40 can output electrical signal parameters in the form of voltage, power, or electric field strength according to the strength of the electromagnetic signal. The electrical signal parameters can be positively correlated with the strength of the electromagnetic signal. For example, the stronger the electromagnetic signal, the greater the voltage, the higher the power, or the stronger the electric field strength can be output by the RF detection module 40. The weaker the electromagnetic signal, the smaller the voltage, the lower the power, or the weaker the electric field strength can be output by the RF detection module 40. According to the needs of the controller 50, the RF detection module 40 can send one or two or even all of the voltage, power, and electric field strength information to the controller 50.

[0079] In another embodiment, the electrical signal parameters output by the RF detection module 40 may also be negatively correlated with the strength of the electromagnetic signal. For example, the weaker the electromagnetic signal, the greater the voltage, the higher the power or the stronger the electric field strength may be output by the RF detection module 40. The correlation between the electrical signal parameters and the electromagnetic signal may be pre-calibrated according to the needs of the controller 50.

[0080] Although embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, combinations, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A test device for testing the electromagnetic immunity of a device under test, characterized in that: The testing device comprises: A test cavity, wherein a test cavity is provided in the test cavity, and the test cavity is used to place the tested object; Antenna assembly; A radio frequency module, the radio frequency module is electrically connected to the antenna assembly, the radio frequency module is used to output a radio frequency signal, and the antenna assembly is used to feed the radio frequency signal into the test cavity; A radio frequency detection module, the radio frequency detection module is used to collect electromagnetic signals at the position of the measured object and convert the electromagnetic signals into electrical signal parameters, and; A controller is electrically connected to the radio frequency detection module, and is used to record the electrical signal parameters.

2. The testing device according to claim 1, characterized in that: The radio frequency detection module includes a detection antenna, and the detection antenna is installed on the bottom wall of the test cavity.

3. The testing device according to claim 2, characterized in that: The radio frequency detection module includes a plurality of detection antennas, and the plurality of detection antennas are spaced apart to form a test area, and the device under test is located in the test area.

4. The testing device according to claim 2, characterized in that: The radio frequency detection module includes a detection circuit, an input end of the detection circuit is connected to one end of the detection antenna, and an output end of the detection circuit is connected to the controller.

5. The testing device according to claim 4, characterized in that: The radio frequency detection module includes a signal processing circuit, the output end of the detection circuit is connected to the input end of the signal processing circuit, the output end of the signal processing circuit is connected to the controller, and the signal processing circuit is used to process the output signal of the detection circuit into an electrical signal parameter that can be recognized by the controller.

6. The testing device according to claim 4 or 5, characterized in that: The detection circuit includes a DC blocking capacitor and a detector, one end of the DC blocking capacitor is connected to one end of the detection antenna, the other end of the DC blocking capacitor is connected to the input end of the detector, and the output end of the detector is connected to the input end of the controller or the signal processing circuit.

7. The testing device according to claim 6, characterized in that: The electrical signal parameter includes a voltage magnitude, and the radio frequency detection module includes an adjustment circuit, the adjustment circuit is connected to the output end of the detector, and the adjustment circuit is used to adjust the voltage magnitude output by the detector.

8. The testing device according to claim 4, characterized in that: The radio frequency detection module includes an attenuator, an input end of the attenuator is connected to one end of the detection antenna, and an output end of the attenuator is connected to an input end of the detection circuit.

9. The testing device according to claim 1, characterized in that: The RF module includes a transmitter, and the controller is used to reduce the power of the transmitter when the electrical signal parameter is greater than a first preset threshold, and increase the power of the transmitter when the electrical signal parameter is less than a second preset threshold, and the first preset threshold is greater than the second preset threshold.

10. The testing device according to claim 1, characterized in that: The electrical signal parameter includes at least one of voltage, power and electric field strength.

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