Load test tool and load test system
By designing a load testing fixture and using a switch to switch high-power resistors to simulate loads, the problem of low testing efficiency caused by frequent resistor replacements in existing technologies is solved, achieving efficient current monitoring and improved testing results.
Patent Information
- Application Number
- CN202520143742.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-01-21
AI Technical Summary
In existing technologies, the resistors of simulated loads need to be replaced frequently, resulting in low testing efficiency and an inability to adapt to current changes caused by actual load variations.
A load testing fixture was designed, which includes an input terminal, an output terminal, a power resistor network, and a current detection device. Different loads are simulated by switching high-power resistors, and the resistance value is adjusted by using a switch. There is no need to remove or install the resistors. The current is monitored in real time by combining the current detection device.
It improves testing efficiency, enhances the timeliness and sensitivity of current value monitoring, improves testing results, and reduces short-circuit risk.
Smart Images
Figure CN223796605U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of circuit testing technology, and in particular to a load testing fixture and a load testing system. Background Technology
[0002] In S-parameter testing of high-speed serializer / deserializer (SerDes) links, simulated loads are generally used to replace actual loads to simplify the testing process.
[0003] Currently, it is often necessary to use resistors with fixed resistance values welded on to simulate loads. If the actual load changes, the operating current will change accordingly, and the resistance value must be replaced accordingly. This requires disassembling and replacing the resistor, resulting in low testing efficiency. Utility Model Content
[0004] The main objective of this application is to provide a load testing fixture and a load testing system, which aims to solve the aforementioned technical problems existing in the prior art.
[0005] To address the aforementioned issues, this application provides a load testing fixture, which includes an input terminal, an output terminal, a power resistor network, and a current detection device. The power resistor network is located between the input terminal and the output terminal, and includes a first main circuit. The first main circuit includes a first load unit, which includes a first switch, a first high-power resistor, and a second high-power resistor. The first switch is used to switch one of the first high-power resistor and the second high-power resistor to conduct between the input terminal and the output terminal. The current detection device is connected in series with the power resistor network and is used to detect the current value between the input terminal and the output terminal.
[0006] In some embodiments, the first main circuit further includes a second load unit connected in series with the first load unit. The second load unit includes a second switch and a third high-power resistor. The second switch is used to switch the third high-power resistor in or out so that the third high-power resistor is connected in series with or short-circuited with the first load unit.
[0007] In some embodiments, the first main circuit further includes a third load unit connected in series with the first load unit. The third load unit includes a third switch and a fourth high-power resistor. The third switch is used to switch the fourth high-power resistor in or out so that the fourth high-power resistor is connected in series with or short-circuited with the first load unit.
[0008] In some embodiments, the power resistor network further includes a fourth switch and a first filter branch, the first filter branch being connected in parallel with the first main circuit, the fourth switch being used to turn the first filter branch on or off, and the first filter branch including a first capacitor.
[0009] In some embodiments, the first filter branch further includes a first filter resistor and a fifth switch, the fifth switch being used to switch the first filter resistor in or out so that the first filter resistor is connected in series with or short-circuited with the first capacitor.
[0010] In some embodiments, the power resistor network further includes a sixth switch and a second filter branch, the second filter branch being connected in parallel with the first main circuit and the first filter branch, the sixth switch being used to turn the second filter branch on or off, and the second filter branch including a second capacitor.
[0011] In some embodiments, the second filter branch further includes a second filter resistor and a seventh switch, the seventh switch being used to switch the second filter resistor in or out so that the second filter resistor is connected in series with or short-circuited with the second capacitor.
[0012] In some embodiments, the load test fixture also includes a main switch connected in series with a power resistor network, which is used to make or break the circuit between the input and output terminals.
[0013] In some embodiments, the load test fixture further includes a fuse connected in series with a power resistor network, the fuse being used to blow when the current value is greater than a predetermined threshold.
[0014] To address the aforementioned issues, this application also provides a load testing system, which includes the aforementioned load testing fixture.
[0015] Compared with the prior art, this application provides a load testing fixture, which includes: an input terminal, an output terminal, a power resistor network, and a current detection device; the power resistor network is located between the input terminal and the output terminal, and the power resistor network includes a first main circuit, the first main circuit includes a first load unit, the first load unit includes a first switch, a first high-power resistor and a second high-power resistor, the first switch is used to switch one of the first high-power resistor and the second high-power resistor to conduct the input terminal and the output terminal; the current detection device is connected in series with the power resistor network, and the current detection device is used to detect the current value between the input terminal and the output terminal. Through the above implementation method, different loads can be simulated using a first high-power resistor and a second high-power resistor. When it is necessary to adjust the resistance value of the simulated load, there is no need to reinstall or disassemble the first and second high-power resistors. Simply switch the input and output terminals of one of the first and second high-power resistors using a first switch to adjust the resistance value of the simulated load. This effectively saves the time for adjusting the resistance value and greatly improves the testing efficiency. At the same time, the high-power resistor can increase the maximum current value that the power resistor network can pass, improving the testing effect. Furthermore, the current value between the input terminals can be monitored in real time by a current detection device, thereby improving the timeliness and sensitivity of current value monitoring. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the structure of a load testing system according to one or more embodiments of this application;
[0018] Figure 2 This is a first structural schematic diagram of a load testing fixture according to one or more embodiments of this application;
[0019] Figure 3 This is a second structural schematic diagram of a load testing fixture according to one or more embodiments of this application.
[0020] Reference numerals: Load testing system 1; Load testing fixture 2; Input terminal 10; Output terminal 20; Power resistor network 30; First main circuit 31; First load unit 311; First switch 3111; First high-power resistor 3112; Second high-power resistor 3113; Second load unit 312; Second switch 3121; Third high-power resistor 3122; Third load unit 313; Third switch 3131; Fourth high-power resistor 3132; Fourth switch 32; First filter branch 33; First capacitor 331; First filter resistor 332; Fifth switch 333; Sixth switch 34; Second filter branch 35; Second capacitor 351; Second filter resistor 352; Seventh switch 353; Current detection device 40; Main switch 50; Fuse 60. Detailed Implementation
[0021] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.
[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.
[0023] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.
[0024] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0025] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.
[0026] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).
[0027] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.
[0028] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.
[0029] In S-parameter testing of high-speed serializer / deserializer (SerDes) links, simulated loads are generally used to replace actual loads to simplify the testing process.
[0030] Currently, it is often necessary to use resistors with fixed resistance values welded on to simulate loads. If the actual load changes, the operating current will change accordingly, and the resistance value must be replaced accordingly. This requires disassembling and replacing the resistor, resulting in low testing efficiency.
[0031] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a load testing system according to one or more embodiments of this application.
[0032] To address the aforementioned problems, this application provides a load testing system 1. The load testing system 1 can be used to test circuits, such as testing the S-parameters of a SerDes link. The S-parameters are scattering parameters, which describe the frequency domain characteristics of the transmission line. The load testing system 1 includes a load testing fixture 2, which can provide a simulated load for the load testing system 1. The load testing system 1 may also include a power supply, which can be electrically connected to the load testing fixture 2.
[0033] Combination Figures 2-3 , Figure 2 This is a first structural schematic diagram of a load testing fixture according to one or more embodiments of this application; Figure 3 This is a second structural schematic diagram of a load testing fixture according to one or more embodiments of this application.
[0034] To address the aforementioned issues, this application provides a load testing fixture 2, which includes an input terminal 10, an output terminal 20, a power resistor network 30, and a current detection device 40. The power resistor network 30 is located between the input terminal 10 and the output terminal 20. The power resistor network 30 includes a first main circuit 31, which includes a first load unit 311. The first load unit 311 includes a first switch 3111, a first high-power resistor 3112, and a second high-power resistor 3113. The first switch 3111 is used to switch one of the first high-power resistor 3112 and the second high-power resistor 3113 to conduct the input terminal 10 and the output terminal 20. The current detection device 40 is connected in series with the power resistor network 30 and is used to detect the current value between the input terminal 10 and the output terminal 20.
[0035] Input terminal 10 and output terminal 20 are used to connect the circuit under test (DUT) and ground, respectively. For example, when the load test fixture 2 is used to test the S-parameters of the SerDes link, input terminal 10 can be connected to the DUT, and output terminal 20 can be grounded, thereby creating a potential difference between input terminal 10 and output terminal 20, and generating current when conduction occurs between them. The power resistor network 30 can provide a simulated load between input terminal 10 and output terminal 20. For example, when the load test fixture 2 is powered by a 12V power supply, the actual load is a camera, and the operating current is 120mA, a 100Ω simulated load can be provided through the power resistor network 30 to simulate the aforementioned camera. The first high-power resistor 3112 and the second high-power resistor 3113 are high-power resistors. It should be noted that compared to conventional resistors, high-power resistors have higher power, thus allowing for the passage of larger currents. For example, the first high-power resistor 3112 and the second high-power resistor 3113 may include, but are not limited to, cement resistors, etc. In some application scenarios, the power of the first high-power resistor 3112 and the second high-power resistor 3113 is greater than or equal to 2W. Specifically, the power of the first high-power resistor 3112 and the second high-power resistor 3113 may include, but are not limited to, 2W, 3W, 5W, 10W, etc. The first high-power resistor 3112 and the second high-power resistor 3113 have different resistance values. The first switch 3111 is used to switch one of the first high-power resistor 3112 and the second high-power resistor 3113 to conduct the input terminal 10 and the output terminal 20. The first switch 3111 may include, but is not limited to, a single-pole double-throw switch. It is understood that the first high-power resistor 3112 or the second high-power resistor 3113 can be connected to the circuit according to the actual load requirements. For example, the resistance value of the first high-power resistor 3112 is 100Ω and the resistance value of the second high-power resistor 3113 is 150Ω. When it is necessary to simulate a 100Ω load, the first switch 3111 can conduct the first high-power resistor 3112 to conduct the input terminal 10 and the output terminal 20 and disconnect the second high-power resistor 3113. When it is necessary to simulate a 150Ω load, the first switch 3111 can conduct the second high-power resistor 3113 to conduct the input terminal 10 and the output terminal 20 and disconnect the first high-power resistor 3112. The current detection device 40 can detect the current value between the input terminal 10 and the output terminal 20, allowing the operator to directly understand the specific current value in the circuit and facilitating real-time monitoring of the current. The current detection device 40 may include a display screen to display the current value.
[0036] Through the above implementation method, different loads can be simulated by the first high-power resistor 3112 and the second high-power resistor 3113. When it is necessary to adjust the resistance value of the simulated load, there is no need to reinstall or disassemble the first high-power resistor 3112 and the second high-power resistor 3113. It is only necessary to switch one of the first high-power resistor 3112 and the second high-power resistor 3113 to conduct the input terminal 10 and the output terminal 20 by the first switch 3111. This effectively saves the time for adjusting the resistance value and greatly improves the test efficiency. At the same time, the high-power resistor can increase the maximum current value that the power resistor network 30 can pass through, improve the test effect, and the current value between the input terminal 10 and the output terminal 20 can be monitored in real time by the current detection device 40, thereby improving the timeliness and sensitivity of the current value monitoring. Furthermore, when the input terminal 10 and the output terminal 20 are conducting, there is a resistance value between the input terminal 10 and the output terminal 20, which alleviates the risk of short circuit between the input terminal 10 and the output terminal 20.
[0037] In some embodiments, the first main circuit 31 further includes a second load unit 312 connected in series with the first load unit 311. The second load unit 312 includes a second switch 3121 and a third high-power resistor 3122. The second switch 3121 is used to switch the third high-power resistor 3122 in or out, so that the third high-power resistor 3122 is connected in series with or short-circuited with the first load unit 311. The third high-power resistor 3122 is also a high-power resistor, and the third high-power resistor 3122 may include, but is not limited to, a cement resistor. The power of the third high-power resistor 3122 may include, but is not limited to, 2W, 3W, 5W, 10W, etc. The second switch 3121 can connect the third high-power resistor 3122 in series with or short-circuit the first load unit 311. The second switch 3121 can also be a single-pole double-throw switch. Specifically, the second switch 3121, in conjunction with the first switch 3111, can connect the first high-power resistor 3112 independently to input terminal 10 and output terminal 20; or connect the second high-power resistor 3113 independently to input terminal 10 and output terminal 20; or connect the first high-power resistor 3112 and the third high-power resistor 3122 in series to input terminal 10 and output terminal 20. Output terminal 20; or the second high-power resistor 3113 and the third high-power resistor 3122 can be connected in series between input terminal 10 and output terminal 20. It can be understood that the resistance value of the first high-power resistor 3112 is denoted as R1, the resistance value of the second high-power resistor 3113 as R2, and the resistance value of the third high-power resistor 3122 as R3. Through the cooperation of the first switch 3111 and the second switch 3121, simulated loads with different resistance values such as R1, R2, R1+R3, and R2+R3 can be formed between input terminal 10 and output terminal 20. This increases the diversity of simulated loads in the power resistor network 30, facilitating the improvement of the adaptability of the load testing fixture 2.
[0038] In some embodiments, the first main circuit 31 further includes a third load unit 313 connected in series with the first load unit 311. The third load unit 313 includes a third switch 3131 and a fourth high-power resistor 3132. The third switch 3131 is used to switch the fourth high-power resistor 3132 in or out, so that the fourth high-power resistor 3132 is connected in series with or short-circuited with the first load unit 311. The fourth high-power resistor 3132 is also a high-power resistor, which may include, but is not limited to, a cement resistor, and its power may include, but is not limited to, 2W, 3W, 5W, 10W, etc. The third switch 3131 may also be a single-pole double-throw switch. Specifically, the third switch 3131, in conjunction with the first switch 3111 and the second switch 3121, can further cooperate with the first load unit 311 and the second load unit 312 to form simulated loads with different resistance values. This further increases the diversity of simulated loads in the power resistor network 30, making it easier to improve the adaptability of the load testing fixture 2.
[0039] In some embodiments, the power resistor network 30 further includes a fourth switch 32 and a first filter branch 33, the first filter branch 33 being connected in parallel with the first main circuit 31. The fourth switch 32 is used to turn the first filter branch 33 on or off, and the first filter branch 33 includes a first capacitor 331. It is understood that the fourth switch 32 can be closed to connect the first filter branch 33 in parallel with the first main circuit 31, thereby filtering the power supply through the first capacitor 331 and improving the reliability of the load test fixture 2.
[0040] In some embodiments, the first filter branch 33 further includes a first filter resistor 332 and a fifth switch 333. The fifth switch 333 is used to switch the first filter resistor 332 in or out, so that the first filter resistor 332 is connected in series with the first capacitor 331 or short-circuited. The first filter resistor 332 is a conventional resistor, and its power rating is lower than that of a high-power resistor. For example, the resistance value of the first filter resistor 332 can be between 1 / 10 and 1 / 2W. Specifically, the resistance value of the first filter resistor 332 can be 1 / 8W, 1 / 4W, and 1 / 2W, etc. Optionally, the resistance value of the first filter resistor 332 can be 1 / 4W. When the power quality connected to the input terminal 10 is poor, the first filter resistor 332 and the first capacitor 331 can be connected in series by the fifth switch 333, thereby facilitating the cooperation between the first filter resistor 332 and the first capacitor 331, improving the filtering effect of the first filter branch 33, and further improving the reliability of the load test fixture 2.
[0041] In some embodiments, the power resistor network 30 further includes a sixth switch 34 and a second filter branch 35, the second filter branch 35 being connected in parallel with the first main circuit 31 and the first filter branch 33. The sixth switch 34 is used to turn the second filter branch 35 on or off, and the second filter branch 35 includes a second capacitor 351. It is understood that the sixth switch 34 can be closed to connect the second filter branch 35 in parallel with the first main circuit 31, thereby filtering the power supply through the second capacitor 351, and thus improving the reliability of the load test fixture 2 in conjunction with the first filter branch 33.
[0042] In some embodiments, the second filter branch 35 further includes a second filter resistor 352 and a seventh switch 353. The seventh switch 353 is used to switch the second filter resistor 352 in or out, so that the second filter resistor 352 is connected in series with the second capacitor 351 or short-circuited. The second filter resistor 352 is a conventional resistor, and its power rating is lower than that of a high-power resistor. For example, the resistance value of the second filter resistor 352 can be between 1 / 10 and 1 / 2 W. Specifically, the resistance value of the second filter resistor 352 can be 1 / 8 W, 1 / 4 W, and 1 / 2 W, etc. Optionally, the resistance value of the second filter resistor 352 can be 1 / 4 W. When the power quality connected to the input terminal 10 is poor, the second filter resistor 352 and the second capacitor 351 can be connected in series by the seventh switch 353, thereby facilitating the cooperation between the second filter resistor 352 and the second capacitor 351, improving the filtering effect of the second filter branch 35, and further improving the reliability of the load test fixture 2.
[0043] In some embodiments, the load testing fixture 2 further includes a main switch 50, which is connected in series with the power resistor network 30. The main switch 50 is used to connect or disconnect the input terminal 10 and the output terminal 20. When the main switch 50 is in the open state, the load testing fixture 2 is in the working state; when the main switch 50 is in the closed state, the load testing fixture 2 is in the stopped state. The switch may include, but is not limited to, a toggle switch. Thus, the load testing fixture 2 can be controlled to be turned on or off by the main switch 50, improving the flexibility of the load testing fixture 2.
[0044] In some embodiments, the load test fixture 2 further includes a fuse 60, which is connected in series with the power resistor network 30. The fuse 60 is used to blow when the current value exceeds a predetermined threshold. The fuse 60 may include, but is not limited to, a glass tube fuse 60. It is understood that when the current value between the input terminal 10 and the output terminal 20 exceeds the predetermined threshold, the fuse 60 blows, thereby breaking the circuit between the input terminal 10 and the output terminal 20, thus protecting the load test fixture 2. Therefore, the safety and reliability of the load test fixture 2 are improved by the fuse 60.
[0045] In summary, the load testing fixture 2 provided in this application includes an input terminal 10, an output terminal 20, a power resistor network 30, and a current detection device 40. The power resistor network 30 is located between the input terminal 10 and the output terminal 20. The power resistor network 30 includes a first main circuit 31, which includes a first load unit 311. The first load unit 311 includes a first switch 3111, a first high-power resistor 3112, and a second high-power resistor 3113. The first switch 3111 is used to switch one of the first high-power resistor 3112 and the second high-power resistor 3113 to conduct the input terminal 10 and the output terminal 20. The current detection device 40 is connected in series with the power resistor network 30 and is used to detect the current value between the input terminal 10 and the output terminal 20. Through the above implementation method, different loads can be simulated by the first high-power resistor 3112 and the second high-power resistor 3113. When it is necessary to adjust the resistance value of the simulated load, there is no need to reinstall or disassemble the first high-power resistor 3112 and the second high-power resistor 3113. It is only necessary to switch one of the first high-power resistor 3112 and the second high-power resistor 3113 to conduct the input terminal 10 and the output terminal 20 by the first switch 3111. This effectively saves the time for adjusting the resistance value and greatly improves the test efficiency. At the same time, the high-power resistor can increase the maximum current value that the power resistor network 30 can pass through, improve the test effect, and the current value between the input terminal 10 and the input terminal 20 can be monitored in real time by the current detection device 40, thereby improving the timeliness and sensitivity of the current value monitoring.
[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A load testing tool, characterized by, The load test tool comprises: an input end and an output end; a power resistance network between the input end and the output end, the power resistance network comprising a first main path, the first main path comprising a first load unit, the first load unit comprising a first switch, a first high-power resistance and a second high-power resistance, the first switch being used to switch one of the first high-power resistance and the second high-power resistance to be conductive between the input end and the output end; a current detection device in series with the power resistance network, the current detection device being used to detect a current value between the input end and the output end.
2. The load testing fixture of claim 1, wherein, The first main path further comprises a second load unit in series with the first load unit, the second load unit comprising a second switch and a third high-power resistance, the second switch being used to switch in or out the third high-power resistance to make the third high-power resistance in series with the first load unit or short-circuit.
3. The load testing tool of claim 2, wherein, The first main path further comprises a third load unit in series with the first load unit, the third load unit comprising a third switch and a fourth high-power resistance, the third switch being used to switch in or out the fourth high-power resistance to make the fourth high-power resistance in series with the first load unit or short-circuit.
4. The load testing fixture of claim 1, wherein, The power resistance network further comprises a fourth switch and a first filter branch, the first filter branch being in parallel with the first main path, the fourth switch being used to switch the first filter branch to be conductive or non-conductive, the first filter branch comprising a first capacitor.
5. The load testing fixture of claim 4, wherein, The first filter branch further comprises a first filter resistance and a fifth switch, the fifth switch being used to switch in or out the first filter resistance to make the first filter resistance in series with the first capacitor or short-circuit.
6. The load testing fixture of claim 4, wherein, The power resistance network further comprises a sixth switch and a second filter branch, the second filter branch being in parallel with the first main path and the first filter branch, the sixth switch being used to switch the second filter branch to be conductive or non-conductive, the second filter branch comprising a second capacitor.
7. The load testing fixture of claim 6, wherein, The second filter branch further comprises a second filter resistance and a seventh switch, the seventh switch being used to switch in or out the second filter resistance to make the second filter resistance in series with the second capacitor or short-circuit.
8. The load testing fixture of claim 1, wherein, The load test tool further comprises a total switch in series with the power resistance network, the total switch being used to make the input end and the output end to be conductive or non-conductive.
9. The load testing fixture of claim 8, wherein, The load test tool further comprises a fuse in series with the power resistance network, the fuse being used to be fused in a state where the current value is greater than a predetermined threshold.
10. A load testing system, characterized by The load test system comprises the load test tool according to any one of claims 1 to 9.