Signal detection method and detection equipment

Abstract

The embodiment of the invention provides a signal detection method and detection equipment. The method is applied to detection equipment, the detection equipment comprises a current probe, and the method comprises the following steps: obtaining a detection signal of a differential cable to be detected; determining a target signal value according to the detection signal value and the sleeving mode corresponding to the detection signal; wherein the detection signal value is used for representing a numerical value corresponding to the detection signal, the target signal value is used for representing a numerical value corresponding to the target signal, and the target signal comprises a common-mode noise signal and / or a differential-mode signal; the sleeving mode is a mode that the current probe sleeves the differential cable to be detected. The method provided by the embodiment of the invention reduces the signal detection cost.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of testing technology, and in particular, to a signal detection method and detection device. Background Art

[0002] Common-mode noise signals and differential-mode signals exist simultaneously in common differential cables, such as differential clocks, Ethernet ports, telephone ports, etc. In the related art, a linear impedance stabilization network (LISN) and a power combiner are usually used to measure the common-mode noise signal and / or differential-mode signal of the differential cable to be tested. However, the method in the related art needs to use a relatively expensive LISN and a power combiner, which results in the method in the related art having the problem of being too costly. Summary of the invention

[0003] The embodiments of the present application provide a signal detection method and a detection device, which can reduce the cost of signal detection.

[0004] In a first aspect, an embodiment of the present application provides a signal detection method, which is applied to a detection device, the detection device including a current probe, and the method includes:

[0005] Acquire a detection signal of the differential cable to be tested; and

[0006] The target signal value is determined according to the detection signal value and the setting mode corresponding to the detection signal; wherein the detection signal value is used to represent the numerical value corresponding to the detection signal, and the target signal value is used to represent the numerical value corresponding to the target signal, and the target signal includes a common-mode noise signal and / or a differential-mode signal; the setting mode is a mode in which the current probe is set on the differential cable to be tested.

[0007] In this solution, the detection device can obtain the detection signal of the differential cable to be tested. The detection device can determine the target signal value (used to represent the numerical value corresponding to the target signal) based on the detection signal value (used to represent the numerical value corresponding to the detection signal) and the set mode corresponding to the detection signal. The target signal includes a common-mode noise signal and / or a differential-mode signal. In this way, the embodiment of the present application utilizes a low-cost current probe, and the common-mode noise signal value and / or the differential-mode signal value can be determined by the detection signal and its corresponding set mode, which is not constrained by the site equipment, has low detection cost, and is simple and efficient.

[0008] In one implementation,

[0009] The differential cable to be tested includes two differential lines;

[0010] The set-up method includes the first method, the second method or the third method;

[0011] The first method is that the current probe is set on two differential lines, and the two differential lines pass through the current probe in the same direction;

[0012] The second method is that the current probe is set on the two differential lines, and the two differential lines pass through the current probe in different directions;

[0013] The third method is to place the current probe sleeve on any one of the two differential lines.

[0014] In this solution, the detection signal can be flexibly acquired through a variety of set-up methods, and the common-mode noise signal value and / or the differential-mode signal value can be determined based on different detection signals and the corresponding multiple set-up methods.

[0015] In one implementation, determining the target signal value according to the detection signal value and the set mode corresponding to the detection signal includes:

[0016] When the detection signal is the first detection signal and the setting mode corresponding to the first detection signal is the first mode, it is determined that the target signal is a common mode noise signal and the common mode noise signal value is the first detection signal value.

[0017] In this solution, by using a current probe installation method, the detection equipment can directly determine the common mode noise signal value, with low detection cost and short detection time.

[0018] In one implementation, determining the target signal value according to the detection signal value and the set mode corresponding to the detection signal includes:

[0019] When the detection signal is the second detection signal and the set mode corresponding to the second detection signal is the second mode, it is determined that the target signal is a differential signal and the differential signal value is half of the second detection signal value.

[0020] In this solution, by using a current probe installation method, the detection equipment can directly determine the differential mode signal value, with low detection cost and short detection time.

[0021] In one implementation, determining the target signal value according to the detection signal value and the set mode corresponding to the detection signal includes:

[0022] When the detection signal includes a first detection signal and the set mode corresponding to the first detection signal is the first mode, determining that the target signal includes a common mode noise signal and the common mode noise signal value is the first detection signal value;

[0023] When the detection signal includes a third detection signal and the set mode corresponding to the third detection signal is the third mode, determining that the target signal includes a differential mode signal;

[0024] According to the first detection signal value and the third detection signal value, the differential mode signal value is determined to be the difference between the third detection signal value and half of the first detection signal value, or the difference between half of the first detection signal value and the third detection signal value.

[0025] In this solution, by setting the current probe on two differential lines, and the two differential lines pass through the current probe in the same direction, and by setting the current probe on any one of the two differential lines, the current probe can obtain the first detection signal and the third detection signal respectively. The detection device can directly determine the differential mode signal value and the common mode noise signal value respectively according to the first detection signal value and the third detection signal value. The above method has low detection cost.

[0026] In one implementation, determining the target signal value according to the detection signal value and the set mode corresponding to the detection signal includes:

[0027] When the detection signal includes the second detection signal and the set mode corresponding to the second detection signal is the second mode, it is determined that the target signal includes a differential signal and the value of the differential signal is half of the value of the second detection signal;

[0028] When the detection signal includes the third detection signal and the set mode corresponding to the third detection signal is the third mode, determining that the target signal includes the common mode noise signal;

[0029] According to the second detection signal value and the third detection signal value, the common mode noise signal value is determined to be the difference between twice the third detection signal value and the second detection signal value, or the sum of twice the third detection signal value and the second detection signal value.

[0030] In this solution, the current probe can obtain the second detection signal and the third detection signal respectively by setting the current probe sleeve on the two differential lines, and the two differential lines pass through the current probe in opposite directions, and the current probe sleeve is set on any one of the two differential lines. The detection device can directly determine the differential mode signal and the common mode noise signal value respectively according to the second detection signal value and the third detection signal value. The above method has low detection cost.

[0031] In one implementation, the differential cable to be tested includes a first differential line and a second differential line; determining a target signal value according to a detection signal value and a set mode corresponding to the detection signal includes:

[0032] In the case where the detection signal includes a first sub-detection signal and a second sub-detection signal, and the sheathing mode corresponding to the first sub-detection signal is that the current probe is sheathed on the first differential line, and the sheathing mode corresponding to the second sub-detection signal is that the current probe is sheathed on the second differential line, it is determined that the target signal includes a common-mode noise signal and a differential-mode signal;

[0033] According to the first sub-detection signal value and the second sub-detection signal value, the common mode noise signal value is determined to be the sum of the first sub-detection signal value and the second sub-detection signal value, and the differential mode signal value is determined to be half of the difference between the first sub-detection signal value and the second sub-detection signal value.

[0034] In this solution, by setting the current probe on the first differential line and the current probe on the second differential line, the current probe can obtain the first sub-detection signal and the second sub-detection signal respectively. The detection device can directly determine the differential mode signal value and the common mode noise signal value respectively according to the first sub-detection signal value and the second sub-detection signal value. The above method has low detection cost.

[0035] In one implementation, the detection signal is detected by a current probe at an out-of-standard frequency point.

[0036] In this scheme, the detection signal can be detected by the current probe at an out-of-standard frequency point. On the one hand, the consistency of the calculation is guaranteed, thereby ensuring the accuracy of the target signal value (common-mode noise signal value and / or differential-mode signal value); on the other hand, it can facilitate the subsequent optimization and rectification of the device under test based on the out-of-standard frequency point and the target signal value to reduce the common-mode noise signal value and / or the differential-mode noise signal value in the differential-mode signal value, so that the common-mode noise signal value and / or the differential-mode noise signal value of the device under test is less than the signal limit corresponding to the out-of-standard frequency point.

[0037] In a second aspect, an embodiment of the present application provides a signal detection device, the signal detection device comprising:

[0038] An acquisition module, used for acquiring a detection signal of the differential cable to be tested; and

[0039] A processing module is used to determine a target signal value according to a detection signal value and a setting mode corresponding to the detection signal; wherein the detection signal value is used to represent a numerical value corresponding to the detection signal, and the target signal value is used to represent a numerical value corresponding to the target signal, and the target signal includes a common-mode noise signal and / or a differential-mode signal; and the setting mode is a mode in which a current probe is set on a differential cable to be tested.

[0040] The signal detection device provided in this embodiment can implement the technical solution in the first aspect above, and its beneficial effects are similar, which will not be described in detail here.

[0041] In one implementation, the processing module is specifically configured to:

[0042] When the detection signal is the first detection signal and the setting mode corresponding to the first detection signal is the first mode, it is determined that the target signal is a common mode noise signal and the common mode noise signal value is the first detection signal value.

[0043] The signal detection device provided in this embodiment can implement the technical solution in the first aspect above, and its beneficial effects are similar, which will not be described in detail here.

[0044] In one implementation, the processing module is specifically configured to:

[0045] When the detection signal is the second detection signal and the set mode corresponding to the second detection signal is the second mode, it is determined that the target signal is a differential signal, and the differential signal value is half of the second detection signal value.

[0046] The signal detection device provided in this embodiment can implement the technical solution in the first aspect above, and its beneficial effects are similar, which will not be described in detail here.

[0047] In one implementation, the processing module is specifically configured to:

[0048] When the detection signal includes a first detection signal and the set mode corresponding to the first detection signal is the first mode, determining that the target signal includes a common mode noise signal and the common mode noise signal value is the first detection signal value;

[0049] When the detection signal includes a third detection signal and the set mode corresponding to the third detection signal is the third mode, determining that the target signal includes a differential mode signal;

[0050] According to the first detection signal value and the third detection signal value, the differential mode signal value is determined to be the difference between the third detection signal value and half of the first detection signal value, or the difference between half of the first detection signal value and the third detection signal value.

[0051] The signal detection device provided in this embodiment can implement the technical solution in the first aspect above, and its beneficial effects are similar, which will not be described in detail here.

[0052] In one implementation, the processing module is specifically configured to:

[0053] When the detection signal includes the second detection signal and the set mode corresponding to the second detection signal is the second mode, it is determined that the target signal includes a differential mode signal, and the value of the differential mode signal is half of the value of the second detection signal;

[0054] When the detection signal includes the third detection signal and the set mode corresponding to the third detection signal is the third mode, determining that the target signal includes the common mode noise signal;

[0055] According to the second detection signal value and the third detection signal value, the common mode noise signal value is determined to be the difference between twice the third detection signal value and the second detection signal value, or the sum of twice the third detection signal value and the second detection signal value.

[0056] The signal detection device provided in this embodiment can implement the technical solution in the first aspect above, and its beneficial effects are similar, which will not be described in detail here.

[0057] In one implementation, the differential cable to be tested includes a first differential line and a second differential line; and a processing module, specifically configured to:

[0058] In the case where the detection signal includes a first sub-detection signal and a second sub-detection signal, and the sheathing mode corresponding to the first sub-detection signal is that the current probe is sheathed on the first differential line, and the sheathing mode corresponding to the second sub-detection signal is that the current probe is sheathed on the second differential line, it is determined that the target signal includes a common-mode noise signal and a differential-mode signal;

[0059] According to the first sub-detection signal value and the second sub-detection signal value, the common mode noise signal value is determined to be the sum of the first sub-detection signal value and the second sub-detection signal value, and the differential mode signal value is determined to be half of the difference between the first sub-detection signal value and the second sub-detection signal value.

[0060] The signal detection device provided in this embodiment can implement the technical solution in the first aspect above, and its beneficial effects are similar, which will not be described in detail here.

[0061] In one implementation, the detection signal is detected by a current probe at an out-of-standard frequency point.

[0062] The signal detection device provided in this embodiment can implement the technical solution in the first aspect above, and its beneficial effects are similar, which will not be described in detail here.

[0063] In a third aspect, an embodiment of the present application provides a detection device,

[0064] The detection equipment includes a current probe; the current probe is used to be set on the differential cable to be tested;

[0065] A detection device is used to execute the method of the first aspect.

[0066] The detection device provided in this embodiment can execute the technical solution in the above-mentioned first aspect, and its beneficial effects are similar, which will not be repeated here.

[0067] In one implementation, the detection device further includes a receiving device, which is electrically connected to the current probe, and the receiving device is used to determine the detection signal value based on the detection signal acquired by the current probe.

[0068] The detection device provided in this embodiment can execute the technical solution in the above-mentioned first aspect, and its beneficial effects are similar, which will not be repeated here.

[0069] In one implementation, the detection device further includes a computing device,

[0070] A current probe, used to obtain a detection signal of the differential cable to be tested;

[0071] A receiving device, used to receive a detection signal and determine a detection signal value according to the detection signal; wherein the detection signal value is used to represent a numerical value corresponding to the detection signal;

[0072] A computing device is used to determine a target signal value based on a detection signal value and a setting mode corresponding to the detection signal; wherein the target signal value is used to represent a numerical value corresponding to the target signal, and the target signal includes a common-mode noise signal and / or a differential-mode signal; and the setting mode is a mode in which a current probe is set on a differential cable to be tested.

[0073] The detection device provided in this embodiment can execute the technical solution in the above-mentioned first aspect, and its beneficial effects are similar, which will not be repeated here.

[0074] In a fourth aspect, this embodiment provides a detection device, including:

[0075] A processor, and a memory communicatively connected to the processor;

[0076] Memory is used to store computer executable instructions;

[0077] The processor is configured to execute computer-executable instructions stored in the memory to implement the method of the first aspect.

[0078] The detection device provided in this embodiment can execute the technical solution in the above-mentioned first aspect, and its beneficial effects are similar, which will not be repeated here.

[0079] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, in which computer-readable storage medium is stored computer-executable instructions, and when the computer-executable instructions are executed by a processor, they are used to implement the method of the first aspect.

[0080] In a sixth aspect, an embodiment of the present application provides a computer program product, including a computer program, which is used to implement the method of the first aspect when the computer program is executed by a processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the following is a brief introduction to the drawings required for use in the embodiments or the related technical descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0082] Figure 1 A structural diagram of a signal detection system provided in an embodiment of the present application;

[0083] Figure 2 A schematic diagram of voltage, current, and impedance provided in an embodiment of the present application;

[0084] Figure 3 A schematic diagram of a flow chart of a signal detection method provided in an embodiment of the present application;

[0085] Figure 4 The schematic diagram of the first embodiment of the sleeve arrangement provided in the embodiment of the present application;

[0086] Figure 5 A schematic diagram of the direction of a magnetic field and the direction of a signal provided in an embodiment of the present application;

[0087] Figure 6 The schematic diagram of the second embodiment of the sleeve arrangement provided in the embodiment of the present application;

[0088] Figure 7 The schematic diagram of the first sub-mode provided for the embodiment of the present application is as follows;

[0089] Figure 8 A schematic diagram of the second sub-method of the set-up method provided in the embodiment of the present application;

[0090] Fig. 9 A schematic diagram of the structure of a signal detection device provided in an embodiment of the present application;

[0091] Fig.10 A schematic diagram of the structure of a detection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0092] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments made by ordinary technicians in this field under the enlightenment of the embodiments belong to the scope of protection of the present application.

[0093] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0094] Glossary:

[0095] Electromagnetic Compatibility (EMC) refers to the ability of electronic and electrical equipment or systems to work normally as designed in the expected electromagnetic environment and not cause unbearable electromagnetic interference (EMI) to anything in the electromagnetic environment.

[0096] Differential cable (also known as differential signal line): a cable or wire pair used to transmit differential signals, which has the characteristics of strong anti-interference ability and good signal integrity. In differential cables, differential signals are transmitted through a pair of differential wires, and the phases of the signals on the two differential wires of the differential signal line are opposite. A positive signal is transmitted on one differential wire (wire), and a negative signal is transmitted on the other differential wire. The signal input end (signal receiving end) of the differential signal can determine the logical state sent by the signal output end (signal sending end) based on the difference between the positive signal and the negative signal.

[0097] Common Mode Noise signal: refers to the noise signal that exists simultaneously on the two differential lines of the differential cable and has the same phase. The common mode noise signal (current signal) flows in the same direction on the two differential lines and returns through the ground line.

[0098] Differential mode noise signal: refers to the noise signal that exists simultaneously on the two differential lines of the differential cable and has opposite phases. The differential mode noise signal (current signal) flows out along one differential line and returns along the other differential line. There is no differential mode noise signal in the ground line.

[0099] The following describes the application scenarios involved in the embodiments of the present application.

[0100] In the design of EMC, the analysis of the differential mode signal value and / or common mode noise signal value of the differential cable to be tested connected to the device under test is an important part of the EMC design. After determining the differential mode signal value and / or common mode noise signal value of the differential cable to be tested, the subsequent EMC design work can be carried out in a targeted manner, such as the optimization and rectification of the device under test.

[0101] The embodiment of the present application provides a signal detection method, which can determine the target signal value (the value corresponding to the target signal) according to the detection signal value (the value corresponding to the detection signal) and the corresponding installation mode of the detection signal (the way the current probe is installed on the differential cable to be tested) after obtaining the detection signal of the differential cable to be tested. The target signal includes a common-mode noise signal and / or a differential-mode signal. The method of the embodiment of the present application that can determine the common-mode noise signal value and / or the differential-mode signal value using a current probe is low in cost and easy to use.

[0102] The signal detection method of the embodiment of the present application is described in detail below.

[0103] For example, Figure 1 A structural diagram of a signal detection system provided in an embodiment of the present application, such as Figure 1 As shown, the signal detection system 10 may include: a device under test 11, a detection device 14 and a differential cable to be tested 15. The detection device 14 may include a current probe 141 and a receiving device 142.

[0104] In some implementations, the signal detection system 10 may further include a load 16 , a power supply 12 , and other differential cables 13 . The detection device 14 may further include a computing device 143 .

[0105] The device under test 11 is electrically connected to the power supply 12 via the other differential cable 13. The device under test 11 is electrically connected to the load 16 via the differential cable to be tested 15. The differential cable to be tested 15 includes two differential lines, namely a first differential line and a second differential line.

[0106] The current probe 141 of the detection device 14 is used to be mounted on the differential cable 15 to be tested.

[0107] It should be noted that there are many ways to mount the current probe 141 on the differential cable 15 to be tested. For example, Figure 1 The current probe 141 shown is mounted on the differential cable 15 to be tested in the first manner described below, that is, the current probe 141 is mounted on two differential lines, and the two differential lines pass through the current probe 141 in the same direction.

[0108] Next, each component included in the detection system 10 is described.

[0109] The device under test 11 may be a complete device, a module, a single board, a device, a chip, a circuit, or other components that generate electromagnetic interference. When the device under test 11 is a component such as a module, a single board, a device, or a chip that cannot be directly electrically connected to the power supply 12 and the load 16, the signal detection system 10 may also include a test board corresponding to the device under test 11 (which may provide peripheral circuits) ( Figure 1 (not shown). The module, single board, device or chip, etc., can be connected to its corresponding test board to be electrically connected to the power supply 12 and the load 16 through the test board.

[0110] The power supply 12 is a device that can supply power to the device under test 11 through other differential cables 13. Exemplarily, the power supply 12 can be a power supply unit (PSU) that converts AC power with a higher working voltage into DC power with a lower working voltage to supply power to the device under test 11 through other differential cables 13.

[0111] The load 16 may be a complete device, a module, a single board, a device, a chip, a circuit, or other components connected to the device under test 11 via the differential cable 15 to be tested.

[0112] Exemplarily, the receiving device 142 may be a receiver, a spectrum analyzer, or other equipment capable of receiving a detection signal sent by a current probe and obtaining a detection signal value (a numerical value corresponding to the detection signal).

[0113] Exemplarily, the computing device 143 can be a mobile phone, a computer, a server or other device with computing functions, and the computing device 143 can also have basic input and output functions. The computing device 143 can also be other devices that can obtain the detection signal value sent by the receiving device, and obtain the target signal value according to the detection signal value and the set method corresponding to the detection signal. Among them, the target signal value is used to represent the numerical value corresponding to the target signal, and the target signal includes a common mode noise signal and / or a differential mode signal.

[0114] It should be noted that Figure 1 This is only a structural diagram of the signal detection system provided in the embodiment of the present application. Figure 1 The actual form of the various devices included in the Figure 1 The interaction mode between devices is limited, and in the application of the solution, it can be set according to actual needs.

[0115] The technical solution of the present application is described in detail below through specific embodiments. It should be noted that the following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0116] The differential cable to be tested includes two differential lines, namely a first differential line and a second differential line, wherein the first differential line is used to transmit a positive signal, and the second differential line is used to transmit a negative signal.

[0117] There are common-mode noise signals and differential-mode signals on the differential cable to be tested. It should be noted that the differential-mode signal is the superposition signal of the differential-mode noise signal and the differential signal. It should also be noted that both the differential-mode noise signal and the common-mode noise signal are noise signals. The differential signal is the signal actually sent by the signal output end (signal sending end). It should also be noted that the device under test is the signal output end (signal sending end) and the load is the signal input end (signal receiving end).

[0118] Figure 2 A schematic diagram of voltage, current, and impedance provided in an embodiment of the present application.

[0119] like Figure 2 As shown in the figure, for the differential cable to be tested, the differential mode signal of the differential cable to be tested is i diff , the common mode noise signal is i CM , the common mode impedance to ground is Z GCM , the common mode impedance to the load is Z LCM , the common mode voltage to ground is U GCM .

[0120] For the first differential line in the differential cable to be tested, the first differential mode signal of the first differential line is i diff , the first common mode noise signal is 1 / 2i CM , the first differential mode impedance to ground is 1 / 2Z Gdiff 、The differential impedance of the first pair of loads is 1 / 2Z Ldiff , the first pair of differential mode voltage is 1 / 2U Gdiff .

[0121] For the second differential line in the differential cable to be tested, the second differential mode signal of the second differential line is i diff , the second common mode noise signal is 1 / 2i CM , the second differential mode impedance to ground is 1 / 2Z Gdiff , the second pair of load differential mode impedance is 1 / 2Z Ldiff , the second ground differential voltage is 1 / 2U Gdiff .

[0122] It should be noted that the first common mode noise signal value (1 / 2i CM) (the value corresponding to the first common-mode noise signal), and the second common-mode noise signal value on the second differential line (1 / 2i CM )) and the value of the common-mode noise signal of the differential cable to be tested (i CM )(the value corresponding to the common mode noise signal) is equal.

[0123] It should also be noted that the first differential signal (i diff ) value (the value corresponding to the first differential signal), and the second differential signal on the second differential line (i diff ) value (the value corresponding to the second differential signal) is consistent with the differential signal of the differential cable to be tested (i diff ) value (the value corresponding to the differential signal) is equal.

[0124] Figure 3 A flow chart of a signal detection method provided in an embodiment of the present application. Figure 3 , the method specifically comprises the following steps:

[0125] S301: Acquire a detection signal of a differential cable to be tested.

[0126] In this embodiment, the detection device can obtain the detection signal of the differential cable to be tested. The detection signal is obtained by detecting the current probe of the detection device set on the differential cable to be tested. In one implementation, the detection signal is detected by the current probe at an over-standard frequency point. It should be noted that, in one implementation, the over-standard frequency point can be the vector sum corresponding to the common mode noise signal and the differential mode signal, which exceeds the frequency corresponding to the signal limit.

[0127] In one implementation, the detection device includes a current probe, a receiving device, and a computing device. The current probe can detect the differential cable to be tested to obtain a detection signal. The receiving device can receive the detection signal sent by the current probe and can determine the detection signal value according to the detection signal. The detection signal value is used to represent the numerical value corresponding to the detection signal. The computing device can obtain the detection signal value sent by the receiving device.

[0128] S302: Determine a target signal value according to the detection signal value and the setting mode corresponding to the detection signal.

[0129] In this embodiment, the detection device obtains the sheathing mode corresponding to the detection signal. It can be understood that the sheathing mode is a mode in which the current probe is sheathed on the differential cable to be tested. In other words, the sheathing mode is a mode in which the differential cable to be tested passes through the current probe. Exemplarily, taking the current probe as a clamp-type current probe as an example, the jaws of the clamp-type current probe can be opened, and after the clamp-type current probe is sheathed on the differential cable to be tested, the jaws of the clamp-type current probe can be closed, so that the differential cable to be tested can pass through the clamp-type current probe.

[0130] It should be noted that, in one implementation, the detection device may first obtain the setting method, and after obtaining the setting method, the detection device may obtain the detection signal through the current probe, and then obtain the detection signal value; in one implementation, the detection device may first obtain the detection signal through the current probe, and then obtain the detection signal value, and then obtain the setting method corresponding to the detection signal.

[0131] In one implementation, a computing device of the detection device may obtain a setting method corresponding to the detection signal.

[0132] Next, the process of the computing device obtaining the set mode corresponding to the detection signal is described.

[0133] In one implementation, the computing device may obtain a setting mode input by a user. For example, a display interface of the computing device may display a plurality of selectable setting modes. The computing device may obtain a setting mode selected by the user.

[0134] In one implementation, the computing device may obtain a test mode input by a user. The test mode indicates at least one setting mode and indicates a setting order of at least one setting mode. For example, the computing device may obtain a first test mode input by a user, wherein the first test mode indicates that the setting modes are a first mode and a third mode, and indicates that the setting order is to first use the first mode for setting and then use the third mode for setting.

[0135] The detection device may determine the target signal value according to the detection signal value and the set mode corresponding to the detection signal. The target signal value is used to represent the numerical value corresponding to the target signal, and the target signal includes a common mode noise signal and / or a differential mode signal. In one implementation, the computing device may determine the target signal value according to the detection signal value and the set mode corresponding to the detection signal.

[0136] Next, the principle of determining the target signal value according to the detection signal value and the setting mode corresponding to the detection signal by the detection device is explained.

[0137] The differential cable to be tested includes two differential lines, namely a first differential line and a second differential line.

[0138] In one implementation, the sheathing manner may be the first manner, that is, the current probe may be sheathed on two differential lines, and the two differential lines pass through the current probe in the same direction.

[0139] It should be noted that, for each differential line of the differential cable to be tested, one end of the differential line is electrically connected to the signal output end (device under test), and the other end of the differential line is electrically connected to the signal input end (load).

[0140] A differential line may include multiple sections of differential lines. When the current probe is set on two differential lines, at least one section of each differential line may pass through the current probe.

[0141] The two differential lines pass through the current probe in the same direction, which means that the transmission direction of the differential signal on at least one section of the differential line in one differential line passing through the current probe is the same as the transmission direction of the differential signal on at least one section of the differential line in the other differential line passing through the current probe.

[0142] In one implementation, the sheathing method may be the second method. That is, the current probe may be sheathed on two differential lines, and the two differential lines pass through the current probe in different directions. It should be noted that the two differential lines pass through the current probe in different directions, which means that the transmission direction of the differential signal on at least one differential line passing through the current probe in one differential line is different from the transmission direction of the differential signal on at least one differential line passing through the current probe in another differential line.

[0143] In one implementation, the sheathing mode may be a third mode. That is, the current probe may be sheathed on any one of the two differential lines. It can be understood that the sheathing mode may be a first sub-mode, that is, the current probe may be sheathed on the first differential line. The sheathing mode may also be a second sub-mode, that is, the current probe may be sheathed on the second differential line.

[0144] When the current probe is mounted on the differential cable to be tested, the detection device can obtain the detection signal of the differential cable to be tested through the current probe in the detection device.

[0145] In one implementation:

[0146] Figure 4 The arrangement method provided for the embodiment of the present application is a schematic diagram of the first method.

[0147] like Figure 4 As shown, when the sheathing mode is the first mode, that is, when the current probe is sheathed on two differential lines, and the two differential lines pass through the current probe in the same direction:

[0148] For the first differential line passing through the current probe, the direction of the first differential signal flowing through the first differential line is the first direction. The first differential signal generates a first magnetic field surrounding the first differential line. The magnetic field strength of the first magnetic field is proportional to the magnitude of the first differential signal. The direction of the first magnetic field is the third direction.

[0149] It can be understood that the first direction can be the direction from the signal output end to the signal input end. The device under test is the signal output end, and the load is the signal input end. It should also be noted that Figure 5 A schematic diagram of the direction of a magnetic field and the direction of a signal provided in an embodiment of the present application. Figure 5 As shown, when the direction of the signal (such as the first differential signal) is the first direction, the direction of the magnetic field (such as the first magnetic field) is the third direction; when the direction of the signal (such as the second differential signal) is the second direction, the direction of the magnetic field (such as the second magnetic field) is the fourth direction.

[0150] For the second differential line passing through the current probe, the direction of the second differential signal flowing through the second differential line is the second direction. The second differential signal generates a second magnetic field around the second differential line. The magnetic field strength of the second magnetic field is proportional to the magnitude of the second differential signal. The direction of the second magnetic field is the fourth direction.

[0151] Based on the fact that the first differential signal and the second differential signal are equal in magnitude and in opposite directions, the first magnetic field and the second magnetic field are magnetic fields with equal magnetic field strengths and opposite directions.

[0152] Since the current probe detects the signal on the differential line by sensing the magnetic field around the differential line (conducting wire), when the first magnetic field and the second magnetic field are magnetic fields with equal magnetic field strength and opposite directions, the first magnetic field and the second magnetic field cancel each other out. When the first magnetic field and the second magnetic field cancel each other out, the detection signal obtained by the current probe does not include the first differential mode signal and the second differential mode signal.

[0153] For the first differential line passing through the current probe, the direction of the first common mode noise signal flowing through the first differential line is the first direction, and the first common mode noise signal will generate a third magnetic field surrounding the first differential line. The magnetic field strength of the third magnetic field is proportional to the magnitude of the first common mode noise signal. The direction of the third magnetic field is the third direction.

[0154] For the second differential line passing through the current probe, the direction of the second common mode noise signal flowing through the second differential line is the first direction, and the second common mode noise signal will generate a fourth magnetic field around the second differential line. The magnetic field strength of the fourth magnetic field is proportional to the magnitude of the second common mode noise signal. The direction of the fourth magnetic field is the third direction.

[0155] Based on the fact that the first common-mode noise signal and the second common-mode noise signal are equal in magnitude and the first differential-mode signal and the second differential-mode signal are in the same direction, the third magnetic field and the fourth magnetic field are magnetic fields with equal magnetic field strength and the same direction.

[0156] Since the current probe detects the signal on the differential line by sensing the magnetic field around the differential line. When the third magnetic field and the fourth magnetic field are magnetic fields with equal magnetic field strength and the same direction, the third magnetic field and the fourth magnetic field are superimposed on each other. When the third magnetic field and the fourth magnetic field are superimposed on each other, the detection signal obtained by the current probe includes the first common-mode noise signal and the second common-mode noise signal. The sum of the magnitude of the first common-mode noise signal and the magnitude of the second common-mode noise signal is equal to the magnitude of the common-mode noise signal of the differential cable to be tested. Therefore, the detection signal obtained by the current probe includes the common-mode noise signal of the differential cable to be tested.

[0157] In summary, when the sheathing mode is the first mode, that is, when the current probe is sheathed on two differential lines, and the two differential lines pass through the current probe in the same direction, the detection signal obtained by the current probe does not include the first differential mode signal and the second differential mode signal. The detection signal obtained by the current probe includes the common mode noise signal of the differential cable to be tested. That is to say, when the sheathing mode corresponding to the detection signal (first detection signal) is the first mode, the first detection signal is the common mode noise signal of the differential cable to be tested. Correspondingly, the first detection signal value (the numerical value corresponding to the first detection signal) is the common mode noise signal value (the numerical value corresponding to the common mode noise signal).

[0158] In one implementation:

[0159] Figure 6 The arrangement method provided for the embodiment of the present application is a schematic diagram of the second method.

[0160] like Figure 6 As shown, when the sheathing mode is the second mode, that is, when the current probe is sheathed on two differential lines, and the two differential lines pass through the current probe in different directions:

[0161] For the first differential line passing through the current probe, the direction of the first differential signal flowing through the first differential line is the first direction. The first differential signal generates a first magnetic field surrounding the first differential line. The magnetic field strength of the first magnetic field is proportional to the magnitude of the first differential signal. The direction of the first magnetic field is the third direction.

[0162] For the second differential line passing through the current probe, when the direction in which the second differential line passes through the current probe is different from the direction in which the first differential line passes through the current probe, the direction of the second differential signal flowing through the second differential line is the first direction. The second differential signal will generate a second magnetic field around the second differential line. The magnetic field strength of the second magnetic field is proportional to the magnitude of the second differential signal. The direction of the second magnetic field is the third direction.

[0163] Based on the fact that the first differential signal and the second differential signal are equal in magnitude and have the same direction, the first magnetic field and the second magnetic field are magnetic fields with equal magnetic field strength and the same direction.

[0164] Since the current probe detects the signal on the differential line by sensing the magnetic field around the differential line, when the first magnetic field and the second magnetic field are magnetic fields with equal magnetic field strength and the same direction, the first magnetic field and the second magnetic field are superimposed on each other. When the first magnetic field and the second magnetic field are superimposed on each other, the detection signal obtained by the current probe includes the first differential mode signal and the second differential mode signal. The size of the first differential mode signal and the size of the second differential mode signal are both equal to the size of the differential mode signal of the differential cable to be tested. Therefore, the detection signal obtained by the current probe includes twice the differential mode signal of the differential cable to be tested.

[0165] For the first differential line passing through the current probe, the direction of the first common mode noise signal flowing through the first differential line is the first direction, and the first common mode noise signal will generate a third magnetic field surrounding the first differential line. The magnetic field strength of the third magnetic field is proportional to the magnitude of the first common mode noise signal. The direction of the third magnetic field is the third direction.

[0166] For the second differential line passing through the current probe, when the first differential line and the second differential line pass through the current probe in different directions, the direction of the second common mode noise signal flowing through the second differential line is the second direction, and the second common mode noise signal will generate a fourth magnetic field around the second differential line. The magnetic field strength of the fourth magnetic field is proportional to the magnitude of the second common mode noise signal. The direction of the fourth magnetic field is the fourth direction.

[0167] Based on the fact that the first common mode noise signal and the second common mode noise signal are equal in magnitude and in opposite directions, the third magnetic field and the fourth magnetic field are magnetic fields with equal magnetic field strength and opposite directions.

[0168] Since the current probe detects the signal on the differential line by sensing the magnetic field around the differential line (conducting wire), when the third magnetic field and the fourth magnetic field are magnetic fields with equal magnetic field strength and opposite directions, the third magnetic field and the fourth magnetic field cancel each other out. When the third magnetic field and the fourth magnetic field cancel each other out, the detection signal obtained by the current probe does not include the first common mode noise signal and the second common mode noise signal.

[0169] In summary, when the sheathing mode is the second mode, that is, when the current probe is sheathed on two differential lines, and the two differential lines pass through the current probe in opposite directions, the detection signal obtained by the current probe includes twice the differential mode signal of the differential cable to be tested, and the detection signal obtained by the current probe does not include the first common mode noise signal and the second common mode noise signal. That is to say, when the sheathing mode corresponding to the detection signal (second detection signal) is the second mode, the second detection signal is twice the differential mode signal of the differential cable to be tested. Accordingly, the second detection signal value (the numerical value corresponding to the second detection signal) is twice the differential mode signal value (the numerical value corresponding to the differential mode signal).

[0170] In one implementation:

[0171] Figure 7 The set-up method provided for the embodiment of the present application is a schematic diagram of the first sub-method.

[0172] like Figure 7 As shown, when the sheathing mode is the first sub-mode, that is, when the current probe is sheathed on the first differential line:

[0173] For the first differential line passing through the current probe, the direction of the first differential signal flowing through the first differential line is the first direction. The first differential signal generates a first magnetic field surrounding the first differential line. The magnetic field strength of the first magnetic field is proportional to the magnitude of the first differential signal. The direction of the first magnetic field is the third direction.

[0174] For the first differential line passing through the current probe, the direction of the first common mode noise signal flowing through the first differential line is the first direction, and the first common mode noise signal will generate a third magnetic field surrounding the first differential line. The magnetic field strength of the third magnetic field is proportional to the magnitude of the first common mode noise signal. The direction of the third magnetic field is the third direction.

[0175] Since the current probe detects the signal on the differential line by sensing the magnetic field around the differential line, when the first magnetic field and the third magnetic field are magnetic fields with the same direction, the first magnetic field and the third magnetic field are superimposed on each other. When the first magnetic field and the third magnetic field are superimposed on each other, the detection signal obtained by the current probe includes the first differential mode signal and the first common mode noise signal.

[0176] In summary, when the sheathing mode is the first sub-mode, that is, when the current probe is sheathed on the first differential line, the detection signal (first sub-detection signal) obtained by the current probe includes the first common-mode noise signal and the first differential-mode signal. In other words, when the sheathing mode corresponding to the detection signal (first sub-detection signal) is the first sub-mode, the first sub-detection signal is the sum of one-half of the common-mode noise signal and the differential-mode signal. Accordingly, the first sub-detection signal value is the sum of one-half of the common-mode noise signal value and the differential-mode signal value.

[0177] In one implementation:

[0178] Figure 8 The set-up method provided for the embodiment of the present application is a schematic diagram of the second sub-method.

[0179] like Figure 8 As shown, when the sheathing mode is the second sub-mode, that is, when the current probe is sheathed on the second differential line:

[0180] For the second differential line passing through the current probe, the direction of the second differential signal flowing through the second differential line is the second direction. The second differential signal generates a second magnetic field around the first differential line. The magnetic field strength of the second magnetic field is proportional to the magnitude of the second differential signal. The direction of the second magnetic field is the fourth direction.

[0181] For the second differential line passing through the current probe, the direction of the second common mode noise signal flowing through the second differential line is the first direction, and the second common mode noise signal will generate a fourth magnetic field around the first differential line. The magnetic field strength of the fourth magnetic field is proportional to the magnitude of the second common mode noise signal. The direction of the fourth magnetic field is the third direction.

[0182] The current probe detects the signal on the differential line by sensing the magnetic field around the differential line. When the second magnetic field and the fourth magnetic field are magnetic fields with opposite directions, the second magnetic field will offset part of the fourth magnetic field (or the fourth magnetic field will offset part of the second magnetic field). When the second magnetic field offsets part of the fourth magnetic field (or the fourth magnetic field offsets part of the second magnetic field), the detection signal obtained by the current probe is the difference between the second common mode noise signal and the second differential mode signal. It should be noted that the direction of the second common mode noise signal is the first direction and the direction of the second differential mode signal is the second direction. Therefore, when the first direction (the direction from the signal output end to the signal input end) is measured as the positive direction, the difference between the second common mode noise signal and the second differential mode signal can be used as the detection signal.

[0183] In summary, when the sheathing mode is the second sub-mode, that is, when the current probe is sheathed on the second differential line, the detection signal (second sub-detection signal) obtained by the current probe includes the second common-mode noise signal and the second differential-mode signal. In other words, when the sheathing mode corresponding to the detection signal (second sub-detection signal) is the second sub-mode, the second sub-detection signal is the difference between the common-mode noise signal and the differential-mode signal. Accordingly, the second sub-detection signal value is the difference between the common-mode noise signal value and the differential-mode signal value.

[0184] Based on the above logic analysis process, Table 1 is obtained. Table 1 is a detection signal table.

[0185] Table 1 Detection signal table

[0186]

[0187] Based on the above principle, the following describes a process in which the detection device determines the target signal value according to the detection signal value and the setting method corresponding to the detection signal.

[0188] In one implementation:

[0189] The detection device can determine that the target signal is a common mode noise signal and the common mode noise signal value is the first detection signal value when the detection signal is a first detection signal and the set mode corresponding to the first detection signal is a first mode.

[0190] In the above manner, by using a current probe set-up method, the detection equipment can directly determine the common mode noise signal value, with low detection cost and short detection time.

[0191] In one implementation:

[0192] The detection device can determine that the target signal is a differential signal and the differential signal value is half of the second detection signal value when the detection signal is the second detection signal and the set mode corresponding to the second detection signal is the second mode.

[0193] Through the above method, by using a current probe set method, the detection equipment can directly determine the differential mode signal value, with low detection cost and short detection time.

[0194] In one implementation:

[0195] The detection device may determine that the target signal includes a common mode noise signal and the common mode noise signal value is the first detection signal value when the detection signal includes a first detection signal and the set mode corresponding to the first detection signal is the first mode.

[0196] The detection device may determine that the target signal includes a differential mode signal when the detection signal includes a third detection signal and the set mode corresponding to the third detection signal is the third mode.

[0197] The detection device can determine the differential signal value as the difference between the third detection signal value and half the first detection signal value based on the first detection signal value and the third detection signal value, or determine the differential signal value as the difference between half the first detection signal value and the third detection signal value.

[0198] In this case, the third detection signal includes both differential mode signals and common mode noise signals. In this implementation, the detection device may determine the target signal as including differential mode signals, and the detection device may also determine the common mode noise signal value based on the first detection signal value and the third detection signal value.

[0199] It should be noted that, when the nesting mode is the third mode, the nesting mode may be the first sub-mode or the second sub-mode, and accordingly, the third detection signal may be the first sub-detection signal or the second sub-detection signal.

[0200] In the process of the detection device determining the differential signal value according to the first detection signal value and the third detection signal value: the detection device may determine the differential signal value according to the first detection signal value and the first sub-detection signal value (the differential signal value is the difference between the first sub-detection signal value and one-half of the first detection signal value). The detection device may also determine the differential signal value according to the first detection signal value and the second sub-detection signal value (the differential signal value is the difference between one-half of the first detection signal value and the second sub-detection signal value).

[0201] Below, a process of determining the differential mode signal value and the common mode noise signal value by the detection device when the detection signal includes a first detection signal, and the set mode corresponding to the first detection signal is the first mode, and the detection signal includes a third detection signal, and the set mode corresponding to the third detection signal is the third mode is described in detail.

[0202] In one implementation, the detection device can determine that the target signal includes a common mode noise signal when the detection signal includes a first detection signal and the set mode corresponding to the first detection signal is the first mode, and the common mode noise signal value is the first detection signal value. The detection device can determine that the target signal includes a differential signal when the detection signal includes a first sub-detection signal and the set mode corresponding to the first sub-detection signal is the first sub-mode (the current probe is set on the first differential line). The detection device can determine that the differential signal value is the difference between the first sub-detection signal value and half of the first detection signal value based on the first detection signal value and the first sub-detection signal value. It can be understood that the difference between the former and the latter mentioned in this article refers to the value obtained by subtracting the latter from the former. Among them, when the current probe is set on the first differential line, the third detection signal is the first sub-detection signal.

[0203] By setting the current probe on the two differential lines, and the two differential lines passing through the current probe in the same direction, and setting the current probe on the first differential line, the current probe can obtain the first detection signal and the first sub-detection signal respectively. The detection device can directly determine the differential mode signal value and the common mode noise signal value respectively according to the first detection signal value and the first sub-detection signal value. The above method has low detection cost.

[0204] In one implementation, the detection device can determine that the target signal includes a common mode noise signal when the detection signal includes a first detection signal and the sleeve mode corresponding to the first detection signal is the first mode, and the common mode noise signal value is the first detection signal value. The detection device can determine that the target signal includes a differential signal when the detection signal includes a second sub-detection signal and the sleeve mode corresponding to the second sub-detection signal is the second sub-mode (the current probe is sleeved on the second differential line). The detection device can determine the differential signal value based on the first detection signal value and the second sub-detection signal value. Among them, the differential signal value is the difference between half of the first detection signal value and the second sub-detection signal value. It should be noted that when the current probe is sleeved on the second differential line, the third detection signal is the second sub-detection signal.

[0205] By setting the current probe on the two differential lines, and the two differential lines passing through the current probe in the same direction, and setting the current probe on the second differential line, the current probe can obtain the first detection signal and the second sub-detection signal respectively. The detection device can directly determine the differential mode signal value and the common mode noise signal value respectively according to the first detection signal value and the second sub-detection signal value. The above method has low detection cost.

[0206] In one implementation:

[0207] The detection device can determine that the target signal includes a differential signal, and the value of the differential signal is half of the value of the second detection signal when the detection signal includes the second detection signal and the set mode corresponding to the second detection signal is the second mode.

[0208] The detection device may determine that the target signal includes a common mode noise signal when the detection signal includes a third detection signal and the set mode corresponding to the third detection signal is the third mode.

[0209] The detection device can determine the common mode noise signal value as the difference between twice the third detection signal value and the second detection signal value based on the second detection signal value and the third detection signal value, or determine the common mode noise signal value as the sum of twice the third detection signal value and the second detection signal value.

[0210] In this case, the third detection signal includes both a differential mode signal and a common mode noise signal. In this implementation, the detection device may determine the target signal as including a common mode noise signal, and the detection device may also determine the common mode noise signal value based on the second detection signal value and the third detection signal value.

[0211] Below, a process of determining the differential mode signal value and the common mode noise signal value by the detection device when the detection signal includes the second detection signal and the set mode corresponding to the second detection signal is the second mode, and the detection signal includes the third detection signal and the set mode corresponding to the third detection signal is the third mode is described in detail.

[0212] In one implementation, the detection device can determine that the target signal includes a differential signal, and the differential signal value is half of the second detection signal value, when the detection signal includes a second detection signal and the second detection signal corresponds to the second mode. The detection device can determine that the target signal includes a common-mode noise signal, when the detection signal includes a first sub-detection signal and the first sub-detection signal corresponds to the first sub-mode (the current probe is set on the first differential line).

[0213] The detection device can determine the common mode noise signal value according to the second detection signal value and the first sub-detection signal value; the common mode noise signal value is the difference between twice the first sub-detection signal value and the second detection signal value.

[0214] By setting the current probe on the two differential lines, and the two differential lines passing through the current probe in opposite directions, and by setting the current probe on the first differential line, the current probe can obtain the second detection signal and the first sub-detection signal respectively. The detection device can directly determine the differential mode signal and the common mode noise signal value respectively according to the second detection signal value and the first sub-detection signal value. The above method has low detection cost.

[0215] In one implementation, the detection device may determine that the target signal includes a differential signal, and the differential signal value is half of the value of the second detection signal, when the detection signal includes a second detection signal and the set mode corresponding to the second detection signal is the second mode. The detection device may determine that the target signal includes a common-mode noise signal, when the detection signal includes a second sub-detection signal and the set mode corresponding to the second sub-detection signal is the second sub-mode (the current probe is set on the second differential line).

[0216] The detection device may determine the common mode noise signal value according to the second detection signal value and the second sub-detection signal value; the common mode noise signal value is the sum of twice the second sub-detection signal value and the second detection signal value.

[0217] By setting the current probe on the two differential lines, and the two differential lines passing through the current probe in opposite directions, and the current probe being set on the second differential line, the current probe can obtain the second detection signal and the second sub-detection signal respectively. The detection device can directly determine the differential mode signal value and the common mode noise signal value respectively according to the second detection signal value and the second sub-detection signal value. The above method has low detection cost.

[0218] In one implementation:

[0219] The detection device can determine that the target signal includes a common-mode noise signal and a differential-mode signal when the detection signal includes a first sub-detection signal and a second sub-detection signal, and the installation method corresponding to the first sub-detection signal is that the current probe is installed on the first differential line, and the installation method corresponding to the second sub-detection signal is that the current probe is installed on the second differential line.

[0220] The detection device can determine, based on the first sub-detection signal value and the second sub-detection signal value, that the common mode noise signal value is the sum of the first sub-detection signal value and the second sub-detection signal value, and determine that the differential mode signal value is half of the difference between the first sub-detection signal value and the second sub-detection signal value.

[0221] By installing the current probe on the first differential line and the current probe on the second differential line, the current probe can obtain the first sub-detection signal and the second sub-detection signal respectively. The detection device can directly determine the differential mode signal value and the common mode noise signal value respectively according to the first sub-detection signal value and the second sub-detection signal value. The above method has low detection cost.

[0222] In addition, in one implementation, after determining the target signal value (common mode noise signal value and / or differential mode signal value), the detection device can display the target signal value so that the tester can optimize and rectify the device under test (noise source) according to the target signal value to reduce the common mode noise signal value and / or the differential mode noise signal value in the differential mode signal value. In one implementation, the detection device can display the target signal value and the over-standard frequency point so that the tester can optimize and rectify the device under test (noise source) according to the target signal value and the over-standard frequency point to reduce the common mode noise signal value (common mode noise signal value) and / or the differential mode noise signal value in the differential mode signal value so that the common mode noise signal value and / or the differential mode noise signal value of the device under test is less than the signal limit corresponding to the over-standard frequency point.

[0223] Beneficial effects of this embodiment: In the embodiment of the present application, the detection device can obtain the detection signal of the differential cable to be tested. The detection device can determine the target signal value (used to represent the numerical value corresponding to the target signal) according to the detection signal value (used to represent the numerical value corresponding to the detection signal) and the sheathing method corresponding to the detection signal. Among them, the target signal includes a common-mode noise signal and / or a differential-mode signal. The sheathing method is the way in which the current probe is sheathed on the differential cable to be tested. In this way, the embodiment of the present application utilizes a low-cost current probe, and the common-mode noise signal value and / or the differential-mode signal value can be determined by the detection signal and its corresponding sheathing method, which is not restricted by site equipment, has low detection cost, and is simple and efficient.

[0224] The following are device embodiments of the present application, which can be used to execute the method embodiments of the present application. For details not disclosed in the device embodiments of the present application, please refer to the method embodiments of the present application.

[0225] An embodiment of the present application provides a signal detection device. Fig. 9 A schematic diagram of the structure of a signal detection device provided in an embodiment of the present application; Fig. 9 As shown, the signal detection device 90 includes: an acquisition module 91 and a processing module 92. Among them,

[0226] An acquisition module 91 is used to acquire a detection signal of a differential cable to be tested; and

[0227] The processing module 92 is used to determine the target signal value according to the detection signal value and the setting mode corresponding to the detection signal; wherein the detection signal value is used to represent the numerical value corresponding to the detection signal, and the target signal value is used to represent the numerical value corresponding to the target signal, and the target signal includes a common-mode noise signal and / or a differential-mode signal; the setting mode is a mode in which the current probe is set on the differential cable to be tested.

[0228] The signal detection device provided in this embodiment can execute the technical solution in the above method embodiment, and its beneficial effects are similar, which will not be described again here.

[0229] In one implementation,

[0230] The differential cable to be tested includes two differential lines;

[0231] The set-up method includes the first method, the second method or the third method;

[0232] The first method is that the current probe is set on two differential lines, and the two differential lines pass through the current probe in the same direction;

[0233] The second method is that the current probe is set on the two differential lines, and the two differential lines pass through the current probe in different directions;

[0234] The third method is to place the current probe sleeve on any one of the two differential lines.

[0235] The signal detection device provided in this embodiment can execute the technical solution in the above method embodiment, and its beneficial effects are similar, which will not be described again here.

[0236] In one implementation, the processing module 92 is specifically configured to:

[0237] When the detection signal is the first detection signal and the setting mode corresponding to the first detection signal is the first mode, it is determined that the target signal is a common mode noise signal and the common mode noise signal value is the first detection signal value.

[0238] The signal detection device provided in this embodiment can execute the technical solution in the above method embodiment, and its beneficial effects are similar, which will not be described again here.

[0239] In one implementation, the processing module 92 is specifically configured to:

[0240] When the detection signal is the second detection signal and the set mode corresponding to the second detection signal is the second mode, it is determined that the target signal is a differential signal, and the differential signal value is half of the second detection signal value.

[0241] The signal detection device provided in this embodiment can execute the technical solution in the above method embodiment, and its beneficial effects are similar, which will not be described again here.

[0242] In one implementation, the processing module 92 is specifically configured to:

[0243] When the detection signal includes a first detection signal and the set mode corresponding to the first detection signal is the first mode, determining that the target signal includes a common mode noise signal and the common mode noise signal value is the first detection signal value;

[0244] When the detection signal includes a third detection signal and the set mode corresponding to the third detection signal is the third mode, determining that the target signal includes a differential mode signal;

[0245] According to the first detection signal value and the third detection signal value, the differential mode signal value is determined to be the difference between the third detection signal value and half of the first detection signal value, or the difference between half of the first detection signal value and the third detection signal value.

[0246] The signal detection device provided in this embodiment can execute the technical solution in the above method embodiment, and its beneficial effects are similar, which will not be described again here.

[0247] In one implementation, the processing module 92 is specifically configured to:

[0248] When the detection signal includes the second detection signal and the set mode corresponding to the second detection signal is the second mode, it is determined that the target signal includes a differential mode signal, and the value of the differential mode signal is half of the value of the second detection signal;

[0249] When the detection signal includes the third detection signal and the set mode corresponding to the third detection signal is the third mode, determining that the target signal includes the common mode noise signal;

[0250] According to the second detection signal value and the third detection signal value, the common mode noise signal value is determined to be the difference between twice the third detection signal value and the second detection signal value, or the sum of twice the third detection signal value and the second detection signal value.

[0251] The signal detection device provided in this embodiment can execute the technical solution in the above method embodiment, and its beneficial effects are similar, which will not be described again here.

[0252] In one implementation, the differential cable to be tested includes a first differential line and a second differential line; the processing module 92 is specifically configured to:

[0253] In the case where the detection signal includes a first sub-detection signal and a second sub-detection signal, and the sheathing mode corresponding to the first sub-detection signal is that the current probe is sheathed on the first differential line, and the sheathing mode corresponding to the second sub-detection signal is that the current probe is sheathed on the second differential line, it is determined that the target signal includes a common-mode noise signal and a differential-mode signal;

[0254] According to the first sub-detection signal value and the second sub-detection signal value, the common mode noise signal value is determined to be the sum of the first sub-detection signal value and the second sub-detection signal value, and the differential mode signal value is determined to be half of the difference between the first sub-detection signal value and the second sub-detection signal value.

[0255] The signal detection device provided in this embodiment can execute the technical solution in the above method embodiment, and its beneficial effects are similar, which will not be described again here.

[0256] In one implementation, the detection signal is detected by a current probe at an out-of-standard frequency point.

[0257] The signal detection device provided in this embodiment can execute the technical solution in the above method embodiment, and its beneficial effects are similar, which will not be described again here.

[0258] The embodiment of the present application also provides a detection device. The detection device includes a current probe; the current probe is used to be mounted on the differential cable to be tested. The detection device is used to execute the technical solution in the above method embodiment, and its implementation principle and technical effect are similar, which will not be repeated here.

[0259] In one implementation, the detection device further includes a receiving device, which is electrically connected to the current probe, and the receiving device is used to determine the detection signal value based on the detection signal acquired by the current probe.

[0260] In one implementation, the detection device further includes a computing device and a receiving device; the receiving device is electrically connected to the current probe and the computing device respectively.

[0261] In one implementation, a current probe is used to obtain a detection signal of a differential cable to be tested; a receiving device is used to receive the detection signal and determine a detection signal value based on the detection signal; wherein the detection signal value is used to represent a numerical value corresponding to the detection signal; a computing device is used to determine a target signal value based on the detection signal value and a setting method corresponding to the detection signal; wherein the target signal value is used to represent a numerical value corresponding to the target signal, and the target signal includes a common-mode noise signal and / or a differential-mode signal; and the setting method is a method in which the current probe is set on the differential cable to be tested.

[0262] Fig.10 This is a schematic diagram of the structure of a detection device provided in an embodiment of the present application. Fig.10As shown, the detection device 100 includes a processor 110 and a memory 120; wherein the processor 110 is communicatively connected to the memory 120, and the memory 120 is used to store computer-executable instructions; the processor 110 is configured to execute the technical solution in the aforementioned method embodiment by executing the computer-executable instructions stored in the memory 120.

[0263] Optionally, the memory 120 may be independent or integrated with the processor 110. Optionally, when the memory 120 is a device independent of the processor 110, the detection device 100 may further include: a bus 130 for connecting the above devices.

[0264] The detection device provided in this embodiment can execute the technical solution in the above method embodiment, and its beneficial effects are similar, which will not be described again here.

[0265] An embodiment of the present application also provides a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the technical solution provided by the aforementioned method embodiment.

[0266] An embodiment of the present application also provides a computer program product, including a computer program, which is used to implement the technical solution provided by the aforementioned method embodiment when executed by a processor.

[0267] Those skilled in the art can understand that all or part of the steps of implementing the above-mentioned method embodiments can be completed by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, disk or optical disk and other media that can store program codes.

[0268] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A signal detection method, characterized in that: Applied to a detection device, the detection device includes a current probe, and the method includes: Acquire a detection signal of the differential cable to be tested; and The target signal value is determined according to the detection signal value and the setting mode corresponding to the detection signal; wherein the detection signal value is used to represent the numerical value corresponding to the detection signal, and the target signal value is used to represent the numerical value corresponding to the target signal, and the target signal includes a common-mode noise signal and / or a differential-mode signal; the setting mode is the mode in which the current probe is set on the differential cable to be tested.

2. The method according to claim 1, characterized in that The differential cable to be tested includes two differential lines; The said arrangement method includes the first method, the second method or the third method; The first mode is that the current probe is sleeved on the two differential lines, and the two differential lines pass through the current probe in the same direction; The second mode is that the current probe is sleeved on the two differential lines, and the two differential lines pass through the current probe in different directions; The third mode is that the current probe is mounted on any one of the two differential lines.

3. The method according to claim 2, characterized in that The step of determining the target signal value according to the detection signal value and the set mode corresponding to the detection signal includes: When the detection signal is the first detection signal and the setting mode corresponding to the first detection signal is the first mode, it is determined that the target signal is the common mode noise signal and the common mode noise signal value is the first detection signal value.

4. The method according to claim 2, characterized in that: The step of determining the target signal value according to the detection signal value and the set mode corresponding to the detection signal includes: When the detection signal is the second detection signal and the set mode corresponding to the second detection signal is the second mode, it is determined that the target signal is the differential signal and the differential signal value is half of the second detection signal value.

5. The method according to claim 2, characterized in that: The step of determining the target signal value according to the detection signal value and the set mode corresponding to the detection signal includes: When the detection signal includes a first detection signal and the set mode corresponding to the first detection signal is the first mode, determining that the target signal includes the common mode noise signal and the common mode noise signal value is the first detection signal value; In a case where the detection signal includes a third detection signal and the set mode corresponding to the third detection signal is the third mode, determining that the target signal includes the differential mode signal; According to the first detection signal value and the third detection signal value, the differential mode signal value is determined to be the difference between the third detection signal value and half of the first detection signal value, or the difference between half of the first detection signal value and the third detection signal value.

6. The method according to claim 2, characterized in that The step of determining the target signal value according to the detection signal value and the set mode corresponding to the detection signal includes: When the detection signal includes a second detection signal and the set mode corresponding to the second detection signal is the second mode, determining that the target signal includes the differential mode signal and the differential mode signal value is half of the second detection signal value; In a case where the detection signal includes a third detection signal and the set mode corresponding to the third detection signal is the third mode, determining that the target signal includes the common mode noise signal; According to the second detection signal value and the third detection signal value, the common mode noise signal value is determined to be the difference between twice the third detection signal value and the second detection signal value, or the sum of twice the third detection signal value and the second detection signal value.

7. The method according to claim 2, characterized in that The differential cable to be tested includes a first differential line and a second differential line; the target signal value is determined according to the detection signal value and the set mode corresponding to the detection signal, including: In the case where the detection signal includes a first sub-detection signal and a second sub-detection signal, and the first sub-detection signal corresponds to a sheathing mode in which the current probe is sheathed on the first differential line, and the second sub-detection signal corresponds to a sheathing mode in which the current probe is sheathed on the second differential line, determining that the target signal includes the common-mode noise signal and the differential-mode signal; According to the first sub-detection signal value and the second sub-detection signal value, the common mode noise signal value is determined to be the sum of the first sub-detection signal value and the second sub-detection signal value, and the differential mode signal value is determined to be half of the difference between the first sub-detection signal value and the second sub-detection signal value.

8. The method according to any one of claims 1 to 7, characterized in that: The detection signal is detected by the current probe at an out-of-standard frequency point.

9. A detection device, characterized in that: The detection device comprises a current probe; the current probe is used to be mounted on the differential cable to be tested; The detection device is used to perform the method according to any one of claims 1 to 8.

10. The detection device according to claim 9, characterized in that: The detection device further includes a receiving device, which is electrically connected to the current probe and is used to determine a detection signal value based on the detection signal acquired by the current probe.

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