CN114636866A - Shielding effectiveness testing device - Google Patents
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- CN114636866A CN114636866A CN202210361415.6A CN202210361415A CN114636866A CN 114636866 A CN114636866 A CN 114636866A CN 202210361415 A CN202210361415 A CN 202210361415A CN 114636866 A CN114636866 A CN 114636866A
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- 238000012360 testing method Methods 0.000 title claims abstract description 69
- 230000008878 coupling Effects 0.000 claims abstract description 35
- 238000010168 coupling process Methods 0.000 claims abstract description 35
- 238000005859 coupling reaction Methods 0.000 claims abstract description 35
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 description 9
- 230000009286 beneficial effect Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
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- 230000005540 biological transmission Effects 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
- G01R29/0835—Testing shielding, e.g. for efficiency
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0871—Complete apparatus or systems; circuits, e.g. receivers or amplifiers
Abstract
The invention relates to the technical field of cable testing, in particular to a shielding effectiveness testing device. The shielding effectiveness testing device comprises a bracket assembly, a coupling piece and a network analyzer. The support component is used for supporting the cable to be tested, the coupling piece is sleeved on the cable to be tested, the output end of the network analyzer is connected with the coupling piece, the output end of the network analyzer can output voltage of a first parameter to the coupling piece, the input end of the network analyzer is connected with the cable to be tested, the input end of the network analyzer can receive voltage of a second parameter of the cable to be tested, and the difference value of the first parameter and the second parameter is calculated, and the difference value is the shielding efficiency of the cable. The shielding effectiveness testing device forms the external interference of the cable to be tested through the coupling piece, tests the signal voltage of the external interference signal received by the cable to be tested to calculate the shielding effectiveness, has a simple structure compared with the prior art, and has better accuracy and repeatability of the measuring result.
Description
Technical Field
The invention relates to the technical field of cable testing, in particular to a shielding effectiveness testing device.
Background
With the development of the automobile industry, cables are applied to automobiles more and more. In order to inhibit electromagnetic interference, a plurality of parts and wire harnesses of an automobile are subjected to electromagnetic shielding treatment, and shielding layers are sleeved outside the wire harnesses such as a vehicle-mounted Ethernet wire harness and a high-voltage wire harness to form cables. The shielding layer is used for shielding electromagnetic interference generated by the electronic parts of the automobile in the electronic parts, preventing the electromagnetic interference from leaking out to interfere the normal work of other parts, and meeting the requirements of relevant electromagnetic compatibility standards. The shielding effectiveness is the most important technical index for shielding wire harnesses and connectors, the poor performance can cause the electromagnetic interference generated by parts to leak a large amount, possibly interfere the normal work of other parts, and can cause the electromagnetic emission test to be unqualified, in order to ensure the safe operation of the automobile, the shielding effectiveness is used for evaluating the shielding effect of the cable, the safety range of the shielding effectiveness is set by the automobile industry to meet the requirement of a preset range, and the cable can be safely used in the automobile industry only when the shielding effect of the cable reaches the preset range.
In order to test whether the shielding effectiveness of the cable reaches the standard, an operator provides a shielding effectiveness testing device, which comprises a signal source, a receiver and a standard cable. The signal source and the receiver are respectively connected to two ends of the standard cable, signals are input to the standard cable through the signal source, signals received by the receiver are detected, and the shielding effect of the standard cable is calculated according to the difference value of the input signals and the received signals. However, the shielding effectiveness testing device also needs to be provided with two adapter boxes, two adapters, a frequency spectrum network analyzer, EMI measurement antenna standard testing software, data processing software and other auxiliary structures to achieve the testing effect, key factors such as impedance matching and the like are not considered, and the comparability and repeatability of the measuring result to other methods are poor.
To solve the above problems, it is desirable to provide a shielding effectiveness testing apparatus to solve the above problems.
Disclosure of Invention
The invention aims to provide a shielding effectiveness testing device, which is simple in structure and improves the accuracy and the repeatability of a measuring result.
In order to achieve the purpose, the invention adopts the following technical scheme:
a shielding effectiveness testing apparatus, comprising:
a carriage assembly configured to hold a cable under test;
the coupling piece is sleeved on the cable to be tested;
the output end of the network analyzer is connected with the coupling piece, the output end can output the voltage of the first parameter to the coupling piece, the input end of the network analyzer is connected with the cable to be tested, the input end is configured to receive the voltage of the second parameter of the cable to be tested, and the difference value of the first parameter and the second parameter is calculated, and the difference value is the shielding effectiveness of the cable to be tested.
As an alternative, the end of the coupling element remote from the network analyzer is connected to a termination resistor, and the resistance value of the termination resistor is the same as the resistance value of the output.
As an alternative, the shielding effectiveness testing apparatus further includes:
the connecting piece comprises a first connecting end and a second connecting end, the first connecting end is connected with the output end, and the second connecting end is connected with the coupling piece.
As an alternative, the connector further comprises:
and the third connecting end is connected with the terminal resistor, and the resistance value of the terminal resistor is the same as that of the output end.
As an alternative, the bracket assembly comprises:
an insulating table;
the metal plate is laid on the insulating table; and
at least two support frames, at least two back of the body and interval setting are in on the metal sheet, the support frame is configured to support the cable that awaits measuring.
As an alternative, the supporting frame can support at least one cable to be tested, wherein one cable to be tested is connected with the network analyzer.
As an alternative, the two ends of the cable to be tested which is not tested are connected with the terminal resistor.
As an alternative, two ends of the cable to be tested are respectively electrically connected with the supporting frame.
As an alternative, the coupling is a copper tube.
As an alternative, the network analyzer comprises:
the signal source is connected with the output end and used for providing voltage of the first parameter; and
and the signal source is connected with the input end and used for receiving the voltage of the second parameter and calculating the difference value.
The invention has the beneficial effects that:
the invention provides a shielding effectiveness testing device. The shielding effectiveness testing device comprises a bracket assembly, a coupling piece and a network analyzer. The support assembly is used for supporting a cable to be tested, the coupling piece is sleeved on the cable to be tested, the output end of the network analyzer is connected with the coupling piece, the output end of the network analyzer can output voltage of a first parameter to the coupling piece, the input end of the network analyzer is connected with the cable to be tested, the input end of the network analyzer can receive voltage of a second parameter of the cable to be tested, and the difference value of the first parameter and the second parameter is calculated, and the difference value is the shielding efficiency of the cable. After the shielding effectiveness testing device is connected with the coupling piece, the voltage of the first parameter is output to the coupling piece, and under the condition that the cable is provided with the shielding layer, the shielding layer of the cable has a shielding effect, and the signal voltage which can be received by the core wire of the cable is transmitted to the input end of the network analyzer. And calculating the difference value between the output end and the input end through a network analyzer to obtain the shielding effectiveness. According to the shielding effectiveness testing device, the interference outside the cable to be tested is formed through the coupling piece, and the shielding effectiveness is calculated by testing the signal voltage of the cable to be tested, so that compared with a method for directly testing the input signal and the output signal of the cable to be tested and calculating in the prior art, auxiliary equipment such as a switching box, two adapters and a frequency spectrum network analyzer is not needed, the testing structure is effectively simplified, and the purpose of reducing the cost is further achieved. And the shielding effectiveness testing device considers key factors such as impedance matching and the like, and is beneficial to improving the accuracy and the repeatability of the measuring result.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is a first schematic structural diagram of a shielding effectiveness testing apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a shielding effectiveness testing apparatus according to an embodiment of the present invention;
FIG. 3 is an enlarged partial schematic view at A in FIG. 2;
fig. 4 is a schematic structural diagram three of a shielding effectiveness testing apparatus provided in the embodiment of the present invention;
fig. 5 is a partially enlarged schematic view at B in fig. 4.
The figures are labeled as follows:
100-a bracket assembly; 110-an insulating table; 120-metal plate; 130-a support frame; 131-a first side wall; 132-a second sidewall; 1321-support holes; 133-a third sidewall; 134-a fourth sidewall;
200-a coupling;
300-a network analyzer; 310-a signal source; 320-a receiver;
400-terminal resistance;
500-a connector; 510-a first connection end; 520-a second connection end; 530-a third connection end;
600-a cable to be tested; 610-core wire; 620-shielding layer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only a part of the structure related to the present invention is shown in the drawings, not the whole structure.
In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be structurally related or interoperable between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
With the development of the automobile industry, cables are applied to automobiles more and more. In order to inhibit electromagnetic interference, a plurality of parts and wire harnesses of an automobile are subjected to electromagnetic shielding treatment, and shielding layers are sleeved outside the wire harnesses such as a vehicle-mounted Ethernet wire harness and a high-voltage wire harness to form a cable. The shielding layer is used for shielding electromagnetic interference generated by the electronic parts of the automobile in the electronic parts, preventing the electromagnetic interference from leaking out to interfere the normal work of other parts and meeting the requirements of relevant electromagnetic compatibility standards. The shielding effectiveness is the most important technical index for shielding wire harnesses and connectors, the poor performance can cause the electromagnetic interference generated by parts to leak a large amount, possibly interfere the normal work of other parts, and can cause the electromagnetic emission test to be unqualified, in order to ensure the safe operation of the automobile, the shielding effectiveness is used for evaluating the shielding effect of the cable, the automobile industry has a preset range requirement on the safety range of the shielding effectiveness, and the electromagnetic compatibility and the installation reliability of the whole automobile can be ensured only when the shielding effect of the cable reaches the preset range.
As shown in fig. 1 to 5, the present embodiment provides a shielding effectiveness testing apparatus for testing the shielding effectiveness of the shielding layer of the cable 600 to be tested. Specifically, the cable 600 to be tested includes a core wire 610 and a shielding layer 620, and the shielding layer 620 is sleeved on the core wire 610 and is used for shielding the interference of the signal of the core wire 610 or the external signal to the signal of the core wire 610.
Referring to fig. 1, the shielding performance testing apparatus includes a bracket assembly 100 for holding a cable 600 to be tested. Bracket component 100 includes insulating table 110, and insulating table 110 can be wooden material to the cable 600 that will await measuring is kept apart with ground, with the signal of avoiding among the test procedure to ground transmission, is favorable to improving the accuracy of test result. Further, the shielding effectiveness testing apparatus further includes a network analyzer 300, wherein the network analyzer 300 is configured to output a first parameter and receive a second parameter from the cable 600 to be tested, and calculate the shielding effectiveness according to the first parameter and the second parameter. The number of the insulating tables 110 is two, one of the insulating tables is used for bearing the cable 600 to be tested, and the other insulating table is used for bearing the network analyzer 300, so that interference between signals of the cable 600 to be tested and the network analyzer 300 is avoided, and the accuracy of a test result is further improved.
Referring to fig. 1 and 2, the bracket assembly 100 further includes a metal plate 120 and at least two supporting frames 130. The metal plate 120 is laid on the insulating table 110 carrying the cable 600 to be tested, the at least two supporting frames 130 are arranged on the metal plate 120 in a back-to-back manner at intervals, and the supporting frames 130 can support the cable 600 to be tested. The structure utilizes the conductive action of the metal plate 120 and the supporting frame 130 to enable two ends of the cable 600 to be tested to form a loop with the supporting frame 130 and the metal plate 120, so as to facilitate signal testing. Illustratively, the metal plate 120 and the supporting frame 130 are made of aluminum alloy, which has the characteristics of light weight and low cost.
As shown in fig. 2 and 3, in particular, the supporting frame 130 is a frame-shaped structure including a first sidewall 131, a second sidewall 132, a third sidewall 133 and a fourth sidewall 134 connected in sequence in a counterclockwise direction. The first side wall 131 of the frame structure is a mounting portion connected to the metal plate 120, and plays a role in mounting and fixing. The second sidewall 132 of the frame structure is a supporting portion, the supporting portion is provided with a supporting hole 1321, the cable 600 to be tested can pass through the supporting hole 1321, and when the two supporting frames 130 are arranged at intervals, the two supporting holes 1321 can support the cable 600 to be tested from two ends of the cable 600 to be tested, so that the cable 600 to be tested is horizontally arranged. For example, the length of the cable 600 to be tested may be one meter, and the distance between the two supporting frames 130 is set at an interval of one meter. In order to avoid the middle bending phenomenon when the length of the cable 600 to be measured is large, the bracket assembly 100 further includes a plurality of supporting blocks, and the supporting blocks can support the cable 600 to be measured between the two supporting frames 130.
With continued reference to fig. 2 and fig. 3, a through hole is formed on the fourth sidewall 134, and is close to one end of the network analyzer 300, and the core wire 610 of the cable 600 to be tested, which is disposed on the third sidewall 133, can pass through the through hole and is connected to the network analyzer 300. Away from the end of the network analyzer 300, the core wire 610 of the cable 600 to be tested, which is arranged on the third side wall 133, can pass through the through hole and be connected with the terminating resistor 400. Illustratively, the internal resistance of the network analyzer 300 in this embodiment is 50 Ω, and the termination resistor 400 is a 50 Ω termination resistor 400, and the termination resistor 400 is matched with the internal resistance of the network analyzer 300, so as to be beneficial to reducing reflection and further obtain an accurate and effective test result. Further, the fourth side wall 134 is not connected to the first side wall 131 at the end far from the third side wall 133, which is beneficial for an operator to efficiently and quickly distinguish the second side wall 132 from the fourth side wall 134, so as to avoid connection errors. Of course, in other embodiments, the first sidewall 131, the second sidewall 132, the third sidewall 133 and the fourth sidewall 134 may also be connected end to end.
Further, two ends of the cable 600 to be tested are electrically connected to the supporting frame 130, so that the cable 600 to be tested is connected to the metal plate 120 by the conductive function of the supporting frame 130 to form a current loop.
As shown in fig. 3, in this embodiment, the supporting frame 130 includes multiple forms, one is to support and set one cable 600 to be tested, and the supporting frame 130 is further capable of supporting two, three, four or five cables 600 to be tested, so that an operator can select and use the supporting frame according to test requirements. And since the supporting frames 130 are generally used in a group of two, the supporting frames 130 of each structure include at least two. Each support frame 130 can support at least one cable 600 to be tested, wherein only one cable 600 to be tested is connected with the network analyzer 300, i.e. the network analyzer 300 tests one cable 600 to be tested at a time. However, since other cables are already erected on the supporting frame 130, an operator only needs to change the connection position between the network analyzer 300 and the cable 600 to be tested, so as to detect other cables 600 to be tested, which is beneficial to improving the testing efficiency.
However, when the plurality of cables 600 to be tested are supported on the supporting frame 130, the cables 600 to be tested, which are not connected to the network analyzer 300, have a certain interference with the test. In order to reduce the interference of the cable 600 to be tested, which is not connected to the network analyzer 300, to the test process, both ends of the cable 600 to be tested, which is not connected to the network analyzer 300, are connected to the termination resistor 400.
As shown in fig. 4 and 5, the shielding effectiveness testing apparatus further includes a coupling element 200, the coupling element 200 is sleeved on the cable 600 to be tested, an output end of the network analyzer 300 is connected to the coupling element 200, the output end is capable of outputting a voltage of a first parameter to the coupling element 200, an input end of the network analyzer 300 is connected to the cable 600 to be tested, the input end is capable of receiving a voltage of a second parameter of the cable 600 to be tested, and calculating a difference between the first parameter and the second parameter, where the difference is the shielding effectiveness of the cable. The output of the network analyzer 300 is maintained at a constant level and the output signal voltage is U0(dBuV), which is referred to as U0 (dBuV). When the cable is provided with the shield 620 after the U0(dBuV) is connected to the coupler 200, the shield 620 of the cable has a shielding effect, and thus the signal voltage that can be received by the core wire 610 of the cable is U1(dBuV) and is received by the input terminal of the network analyzer 300. The difference between U0(dBuV) and U1(dBuV) is calculated by the network analyzer 300, which is the shielding effectiveness, i.e., the shielding effectiveness is U0(dBuV) -U1 (dBuV). The shielding effectiveness testing device forms the external interference of the cable 600 to be tested through the coupling piece 200, tests the signal voltage of the cable 600 to be tested for receiving the external interference signal to calculate the shielding effectiveness, and compared with the method for directly testing the input signal and the output signal of the cable 600 to be tested and calculating in the prior art, the method does not need to adopt auxiliary equipment such as a switching box, two adapters and a frequency spectrum network analyzer 300, effectively simplifies the testing structure, and further achieves the purpose of reducing the cost. And the shielding effectiveness testing device considers key factors such as impedance matching and the like, and is beneficial to improving the accuracy and the repeatability of the measuring result.
As an alternative, the coupling element 200 is a copper tube, and the copper has a good conductive effect. The network analyzer 300 includes a signal source 310, the signal source 310 being connected to the output for outputting a voltage of a first parameter. The network analyzer 300 further comprises a receiver 320, the receiver 320 being connected to the input for receiving and calculating the voltage of the second parameter. In the embodiment, the network analyzer 300 is used to combine the signal source 310 and the receiver 320, so as to realize the integration of functions and facilitate the simplification of the overall structure of the shielding effectiveness testing apparatus.
Specifically, mounting holes are formed in the insulating table 110 and the metal plate 120, the output end of the network analyzer 300 penetrates through the mounting holes from the bottom of the insulating table 110 to be connected with the coupling piece 200, and the situation that the output end and the input end of the network analyzer 300 are connected from a desktop to cause desktop confusion or connection errors easily is avoided.
To further improve the accuracy of the test result, the end of the coupling element 200 away from the network analyzer 300 is connected to the termination resistor 400, and the resistance value of the termination resistor 400 is the same as that of the output end. It can be understood that the internal resistance of the network analyzer 300 in this embodiment is 50 Ω, and therefore the termination resistor 400 is also a 50 Ω termination resistor 400, which is beneficial to reduce reflection.
Further, as shown in fig. 5, the shielding effectiveness testing apparatus further includes a connecting element 500, the connecting element 500 includes a first connecting end 510 and a second connecting end 520, the first connecting end 510 is connected to the output end, the second connecting end 520 is connected to the coupling element 200, the connecting element 500 is made of copper, which is beneficial to improving the voltage utilization rate of the first parameter output by the signal source 310. The connector 500 further includes a third connection terminal 530, the third connection terminal 530 is connected to the termination resistor 400, and the resistance value of the termination resistor 400 is the same as that of the output terminal, so as to reduce reflection. It is understood that the internal resistance of the network analyzer 300 in this embodiment is 50 Ω, and therefore the termination resistor 400 is also a 50 Ω termination resistor 400. The connection element 500 is a three-way structure so as to facilitate the connection of the network analyzer 300, the coupling element 200 and the termination resistor 400.
It is noted that the foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims and their equivalents.
Claims (10)
1. A shielding effectiveness testing apparatus, comprising:
a cradle assembly (100) configured to hold a cable (600) under test;
the coupling piece (200) is sleeved on the cable (600) to be tested;
the network analyzer (300), the output of network analyzer (300) with coupling piece (200) is connected, just the output can to coupling piece (200) output the voltage of first parameter, the input of network analyzer (300) with cable under test (600) is connected, the input is configured to receive the voltage of the second parameter of cable under test (600), and calculate the difference of first parameter and the second parameter, the difference is the shielding effectiveness of cable under test (600).
2. The shielding effectiveness testing apparatus according to claim 1, wherein an end of the coupling member (200) remote from the network analyzer (300) is connected to a termination resistor (400), and a resistance value of the termination resistor (400) is the same as a resistance value of the output end.
3. The shielding effectiveness testing apparatus according to claim 1, further comprising:
a connection element (500), the connection element (500) comprising a first connection end (510) and a second connection end (520), the first connection end (510) being connected with the output end, the second connection end (520) being connected with the coupling element (200).
4. The shielding effectiveness testing device according to claim 3, wherein the connector (500) further comprises:
and the third connecting end (530), the third connecting end (530) is connected with a terminal resistor (400), and the resistance value of the terminal resistor (400) is the same as that of the output end.
5. The shielding effectiveness testing device according to any one of claims 1 to 4, wherein the bracket assembly (100) comprises:
an insulating table (110);
a metal plate (120) laid on the insulating table (110); and
at least two support frames (130), at least two support frames (130) are arranged on the metal plate (120) in an opposite way and at intervals, and the support frames (130) are configured to support the cable (600) to be tested.
6. The shielding effectiveness testing apparatus according to claim 5, wherein the supporting frame (130) is capable of supporting at least one cable under test (600), wherein one cable under test (600) is connected to the network analyzer (300).
7. The shielding effectiveness testing apparatus according to claim 6, wherein both ends of the cable (600) to be tested which is not tested are connected to the termination resistor (400).
8. The shielding effectiveness testing apparatus according to claim 5, wherein two ends of the cable (600) to be tested are electrically connected to the supporting frame (130), respectively.
9. The shielding effectiveness testing apparatus according to any one of claims 1 to 4, wherein the coupling member (200) is a copper tube.
10. The shielding effectiveness testing apparatus according to any one of claims 1 to 4, wherein the network analyzer (300) comprises:
a signal source (310), wherein the signal source (310) is connected with the output end and is used for providing the voltage of the first parameter; and
a receiver (320) connected to the input and the signal source (310) is configured to receive the voltage of the second parameter and calculate the difference.
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| CN202210361415.6A CN114636866A (en) | 2022-04-07 | 2022-04-07 | Shielding effectiveness testing device |
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Cited By (1)
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| CN115792441A (en) * | 2022-11-23 | 2023-03-14 | 苏州科标检测有限公司 | Radiation anti-interference test method and test system |
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| CN107843793A (en) * | 2017-11-24 | 2018-03-27 | 广州力赛计量检测有限公司 | A kind of testing jig, shield effectiveness test system and its method of testing |
| CN107966618A (en) * | 2017-11-28 | 2018-04-27 | 广州广电计量检测股份有限公司 | Data cable shield effectiveness detection circuit and method |
| CN110988516A (en) * | 2019-11-08 | 2020-04-10 | 北京宇航系统工程研究所 | Method for testing shielding effectiveness of multi-core special cable |
| CN213240331U (en) * | 2020-08-25 | 2021-05-18 | 南通大地新能源汽车电控与连接技术研究院有限公司 | Cable shielding performance test auxiliary device |
| CN215067007U (en) * | 2021-04-24 | 2021-12-07 | 电连技术股份有限公司 | Three-coaxial electromagnetic shielding test system |
| CN113315543A (en) * | 2021-05-18 | 2021-08-27 | 江苏三亿检测技术有限公司 | Radio frequency interference testing device and method |
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| CN115792441A (en) * | 2022-11-23 | 2023-03-14 | 苏州科标检测有限公司 | Radiation anti-interference test method and test system |
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