CN113315543A - Radio frequency interference testing device and method - Google Patents
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- CN113315543A CN113315543A CN202110541300.0A CN202110541300A CN113315543A CN 113315543 A CN113315543 A CN 113315543A CN 202110541300 A CN202110541300 A CN 202110541300A CN 113315543 A CN113315543 A CN 113315543A
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- H04B3/46—Monitoring; Testing
- H04B3/487—Testing crosstalk effects
Abstract
The invention discloses a radio frequency interference testing device and a testing method, which are arranged in a shielding room and used for testing the radio frequency interference of a cable; the cable comprises a cable to be tested and an interference cable, and the radio frequency interference testing device comprises a testing table and a storage table which are arranged side by side; a network analyzer is arranged on the object placing table, and a signal transmitting port and a signal receiving port are arranged on the network analyzer; the cable to be tested and the interference cable are arranged on the test table and are connected with the network analyzer through the PCB; the ports on the PCB that are not connected to the network analyzer are terminated with a termination resistor. The cable to be tested and the interference cable are arranged on the test table in a U-shaped bent mode, the distance between the cables and the distance between the cable and the edge of the insulating plate are limited, the radio frequency interference test device is installed in a shielding room, and radio frequency interference test is conducted in the shielding room, so that the anti-interference performance in the test process is good, and the accuracy is high.
Description
Technical Field
The invention belongs to the technical field of industrial detection, and particularly relates to a radio frequency interference testing device and a testing method.
Background
The ethernet is one of the local area networks, and is also one of the local area networks which are most widely used at present, including standard ethernet, fast ethernet and 10G ethernet, and coaxial cables, twisted-pair cables, light and the like can all be used as connection media of the ethernet, wherein the coaxial cables are gradually eliminated. In the automobile industry, twisted-pair cables are generally adopted, particularly unshielded twisted-pair cables are used as connecting media, the unshielded twisted-pair cables can realize the development of 1000BASE-T technology, performance data such as signal-to-noise ratio, transmitting power, receiving sensitivity and the like can be obtained by carrying out radio frequency test on Ethernet, and the performance of the Ethernet can be reflected visually. Therefore, it is very important to design an ethernet radio frequency interference testing device and test the ethernet.
In the radio frequency interference test, the crosstalk test of signals is one of important test indexes, the crosstalk includes near-end crosstalk and far-end crosstalk, the near-end crosstalk refers to placing an interference source and an interfered object at the same end, and the far-end crosstalk is placed at the opposite ends. The crosstalk performance test can be performed on the Ethernet through a network analyzer.
In chinese patent application CN101068118A (method and system for measuring crosstalk, length, and line attenuation of cable), a crosstalk test method is disclosed, in a near-end crosstalk test, first connect a cable to be tested and other cables to a plurality of ports of an xDSL (digital subscriber line) line card, and terminate the far end of the cable with impedance of a predetermined resistance value; then the xDSL line card transmits a reverberation signal to the ports connected with other cables, and compares the reverberation signal with a response signal of the reverberation signal received by the port of the cable to be tested to obtain near-end crosstalk; in the far-end crosstalk test, the far end of a cable to be tested is connected to a port of a modem card, other cables are connected to ports of an xDSL line card, the near end of the cable to be tested and the far ends of the other cables are blocked by using impedance, and then a measured reverberation signal is compared with a response signal of the reverberation signal received by the port of the cable to be tested to obtain the far-end crosstalk. However, the invention patent application only provides a testing method and does not provide a responding testing device, and the requirements on the testing device and the testing conditions in the radio frequency interference test are extremely high, so that the operability of the method is poor, and the reference significance is low.
In chinese patent application CN103780314A (radio frequency characteristic testing device), a device for testing network radio frequency performance is provided, which includes a clamping device for fixing a communication circuit board, a network analyzer, an exchange box and a result display device, the device gives the connection relationship between the above hardware devices, and does not relate to the arrangement mode of cables, so that it is not possible to directly perform crosstalk performance testing according to the invention patent application.
However, in the prior art, a specific and practical radio frequency test device and a test method are not available for the radio frequency interference test of the ethernet, especially for the crosstalk performance test, so that the operation difficulty is high, the test time is long, and the test accuracy is often difficult to ensure.
Disclosure of Invention
The technical problem to be solved by the invention is that no professional testing device is provided when the radio frequency interference test is carried out in the prior art, so that the technical problems of low test precision, long test time consumption and the like are easily caused.
In order to solve the technical problem, the invention discloses a radio frequency interference testing device which is arranged in a shielding room and used for radio frequency interference testing of cables, wherein the cables comprise cables to be tested and interference cables; the radio frequency interference testing device comprises a testing table and an object placing table which are arranged side by side; a copper plate and an insulating plate are sequentially laid on the table top of the test table from bottom to top, and one side of the copper plate is connected with a conductor in the wall body of the shielding room for grounding treatment; a network analyzer is arranged on the object placing table, and a signal transmitting port and a signal receiving port are arranged on the network analyzer; the cable to be tested and the interference cable are arranged on an insulating plate of the test table and are connected with a signal transmitting port and a signal receiving port of the network analyzer through a PCB; the ports on the PCB that are not connected to the network analyzer are terminated with a termination resistor.
Furthermore, the network analyzer is electrically connected with a display screen, and the display screen is hung on a wall in the shielding room.
Furthermore, an anti-static bracelet is connected to the network analyzer.
Further, the resistance of the terminating resistor is 50 Ω.
The invention also claims a test method for testing the radio frequency interference by adopting the radio frequency interference test device, wherein the test method comprises a near-end crosstalk test and a far-end crosstalk test.
Further, during the near-end crosstalk test, the used PCB comprises a first PCB and a second PCB; and during the far-end crosstalk test, the used PCB boards comprise a third PCB board and a fourth PCB board.
Furthermore, during the near-end crosstalk test, the head end of the cable to be tested is connected with the signal transmitting port of the network analyzer through the first PCB, and the head end of the interference cable is connected with the signal receiving port of the network analyzer through the first PCB; after the cable to be tested and the interference cable are bent in the same U shape, the tail end of the cable to be tested and the tail end of the interference cable are connected with the second PCB. Furthermore, after the cable to be tested and the interference cable are bent in the U shape, the distance h between any area of the cable to be tested and the interference cable and the edge of the insulating plate1≧ 30 mm; bending distance h formed by cables to be tested and interference cables when connecting PCB2≦ 30 mm; the distance h between the U-shaped cables formed after bending3≧30mm。
Furthermore, during the far-end crosstalk test, the head end of the cable to be tested is connected with the signal transmitting port of the network analyzer through the third PCB, and the tail end of the interference cable is connected with the signal receiving port of the network analyzer through the fourth PCB; after the cable to be tested and the interference cable are bent in the same U shape, the tail end of the cable to be tested is connected with the fourth PCB, and the head end of the interference cable is connected with the third PCB. Furthermore, after the cable to be tested and the interference cable are bent in the U shape, the distance h between any area of the cable to be tested and the interference cable and the edge of the insulating plate1≧ 30 mm; bending distance h formed by cables to be tested and interference cables when connecting PCB2≦ 30 mm; the distance h between the U-shaped cables formed after bending3≧30mm。
That is, when the near-end crosstalk test and the far-end crosstalk test are performed on the cable, the arrangement modes of the cable to be tested and the interference cable are the same, and the differences only lie in the connection modes of the head ends or the tail ends of the cable to be tested and the interference cable and the network analyzer, and whether the end-capping treatment is required or not.
Compared with the existing product, the radio frequency interference testing device and the testing method have the following advantages:
(1) the radio frequency interference testing device is arranged in a shielding room, and radio frequency interference testing is carried out in the shielding room, so that the testing process has good anti-interference performance and high accuracy;
(2) the test board used in the radio frequency interference test has good insulating property and strong anti-interference performance;
(3) the radio frequency interference test is more specific, the operability is strong, and the test efficiency is high.
Drawings
FIG. 1: the structure schematic diagram of the radio frequency interference testing device;
FIG. 2: a radio frequency interference test schematic diagram;
FIG. 3: a cable layout schematic for near end crosstalk testing;
FIG. 4: a cable layout schematic for far end crosstalk testing;
description of reference numerals: 1-a test table; 2-a storage table; 3-a network analyzer; 4-a display screen; 5-antistatic hand ring; 7-the cable to be tested; 8-an interference cable; 9-end-capping resistance; 11-a table top of the test table; 12-copper plate; 13-an insulating plate; 31-signal port of network analyzer; 61-a first PCB board; 62-a second PCB board; 63-a third PCB board; 64-fourth PCB board.
Detailed Description
The technical solution of the present invention will be described in detail by the following specific examples.
As shown in fig. 1, which is a schematic structural diagram of a radio frequency interference testing device, the radio frequency interference testing device is arranged in a shielding room and comprises a testing table 1 and an object placing table 2 which are arranged side by side, and a copper plate 12 and an insulating plate 13 are sequentially laid on a table top 11 of the testing table from bottom to top; a network analyzer 3 is arranged on the object placing table 2, and the network analyzer 3 is electrically connected with a display screen 4; the network analyzer is a 4-port network analyzer, wherein two ports of the signal ports 31 of the network analyzer are signal transmitting ends, and two ports are signal receiving ends.
The height of the test table 1 is 80cm, and the test table 1 consists of epsilon r<1.4 (dielectric constant less than 1.4) and table top size of 180 x 120cm2Universal wheels are arranged on the table legs of the test table 1, so that the test table 1 can move conveniently; the copper plate 12 is made of a material with dimensions of 180 x 120 x 0.8cm3One side of the copper plate 12 is connected with a conductor in the wall body, so that the copper plate 12 is grounded; the insulating plate 13 laid over the copper plate 12 is an insulating polypropylene foam plate with a size of 170 x 120 x 1.0cm3. During testing, the cables are arranged above the insulating polypropylene foam board and then tested.
The object placing table 2 arranged side by side with the test table 1 is also made of insulating materials with the epsilon r less than 1.4, and universal wheels are arranged on table legs below the object placing table 2, so that the position of the object placing table 2 can be conveniently moved; the network analyzer 3 is arranged on the desktop of the storage table 2, the display screen 4 is electrically connected to the network analyzer 3, the display screen 4 is hung on the wall of the shielding room, the size of the display screen 4 is larger than that of a display panel of the network analyzer 3, images and characters can be amplified, the test result of the network analyzer 3 can be displayed through the display screen 4, and a tester can observe the test result more visually and more clearly. In addition, be connected with on the network analyzer 3 and prevent static bracelet 5, the operator when carrying out the radio frequency interference test, will prevent static bracelet 5 and take in the wrist portion, can derive the static of human body, prevent to cause the interference to the test, further improve the degree of accuracy of radio frequency interference test.
During the radio frequency interference test, lay the cable on the insulating polypropylene cystosepiment on the testboard, if cable length overlength, need carry out the bending with the cable and lay, U type is buckled commonly used, and the number of times that the U type is buckled is decided according to cable length, and cable length is longer, and the number of times of buckling is more.
As shown in fig. 2, which is a schematic diagram of the radio frequency interference test, for the cable 7 to be tested, the network analyzer 3 outputs a transmitting signal P to the head end of the cable 7 to be testedinAfter being conducted by the cable 7 to be tested, an output signal P is output at the tail end of the cable 7 to be testedout(ii) a The interference cable 8 arranged in parallel with the cable 7 to be detected receives the interference signal of the cable 7 to be detected and collects the signal intensity P of the interference cable 8 meansnearThat is, the near-end crosstalk test is performed to acquire the signal intensity P at the tail end of the interference cable 8farI.e. a far-end crosstalk test. In the near-end crosstalk test and the far-end crosstalk test, the end of the cable not connected to the network analyzer 3 needs to be terminated.
As shown in fig. 3, a schematic layout diagram of a near-end crosstalk test performed on a cable by using the radio frequency interference testing apparatus is shown: when the near-end crosstalk is tested, the head end of the cable 7 to be tested is connected with the signal transmitting port of the network analyzer 3 through the first PCB 61, and the head end of the interference cable 8 is connected with the signal receiving port of the network analyzer 3 through the first PCB 61; after the cable 7 to be tested and the interference cable 8 are bent in the same U shape, the tail end of the cable 7 to be tested and the tail end of the interference cable 8 are connected to the second PCB 62 respectively. The ports on the second PCB 62 that are not connected to the network analyzer 3 are terminated with termination resistors 9. The resistance value of the terminating resistor 9 is 50 Ω.
The cable 7 to be tested and the interference cable 8 are connected with the first PCB 61 and the second PCB 62 through SMA interfaces, specifically, a radio frequency connector SMA-J-1.5 can be selected, an inner screw inner needle is not used for wiring, and the frequency range of the radio frequency connector is selected to be larger than the test frequency range of a test product.
As shown in fig. 4, a schematic layout diagram of a far-end crosstalk test performed on a cable by using the radio frequency interference testing apparatus is shown: during far-end crosstalk testing, the head end of the cable 7 to be tested is connected with a signal transmitting port of the network analyzer 3 through a third PCB 63, and the tail end of the interference cable 8 is connected with a signal receiving port of the network analyzer 3 through a fourth PCB 64; after the cable 7 to be tested and the interference cable 8 are bent in the same U shape, the tail end of the cable 7 to be tested is connected with the fourth PCB 64, and the head end of the interference cable 8 is connected with the third PCB 63. The ports on the third and fourth PCB boards 63, 64 that are not connected to the network analyzer 3 are terminated with a termination resistor 9. The resistance value of the terminating resistor 9 is 50 Ω.
The cable 7 to be tested and the interference cable 8 are connected with the third PCB 63 and the fourth PCB 64 through SMA interfaces, specifically, a radio frequency connector SMA-J-1.5 can be selected, an inner screw inner needle is not used for wiring, and the frequency range of the radio frequency connector is selected to be larger than the test frequency range of a test product.
In fig. 3 and 4, since the differential crosstalk is highly dependent on the distance between the cables, after the cable 7 to be tested and the interference cable 8 are bent in a U-shape, the distance h between any region of the cable 7 to be tested and any region of the interference cable 8 to the edge of the insulating polypropylene foam board1≧ 30 mm; bending distance h formed by connecting to-be-tested cable 7 and interference cable 8 with PCB2≦ 30 mm; the distance h between the U-shaped cables formed after bending3≧ 30mm, and spacing h between the U-shaped cables3The thickness of the insulating polypropylene foam plate is more than 3 times of that of the insulating polypropylene foam plate, and the inter-group coupling of unshielded cables can be eliminated through the arrangement of the distance, so that the testing precision is improved. The distance between the cable 7 to be measured and the interference cable 8 is set according to the actual condition of the product.
Because the differential crosstalk is highly dependent on the distance between the cables, after the cables are laid on the insulating polypropylene foam board, the cables need to be fixed by an insulating fixing tool, the cables can be fixed by an insulating tape or an insulating clamp, and after the cable harness is fixed, the adjacent cables can be ensured to be contacted in the whole cable harness length. In order to fix the cable 7 to be tested and the interference cable 8, an insulating fixing clamp or an insulating adhesive tape can be used for fixing the cable 7 to be tested and the interference cable 8 on an insulating polypropylene foam board, so that the cable 7 to be tested and the interference cable 8 are prevented from being shifted.
The signal port 31 of the network analyzer is vertically connected with the PCB.
After the cable is laid, firstly, calibration is needed, in the calibration process, the parameter of the measuring clamp is lower than the limit value to be measured, and if the measuring clamp comprises the PCB to be tested, the measuring clamp is used for measuring without welding a connector. The crosstalk of the test fixture of the multiport connector should be measured from each port to any other adjacent port. The measurement fixture should provide sufficient electrical and mechanical quality so that the measurement results are not dictated by the characteristics of the measurement fixture. The measurement fixture used needs to have low insertion loss, high symmetry within two lines of the differential pair, and good matching with a 50 Ω termination resistor 9.
After the calibration is completed, the measurement can be directly carried out.
During measurement, a starting button of the network analyzer 3 is directly turned on, and a radio frequency interference curve can be observed on a display panel of the network analyzer 3; meanwhile, the amplified radio frequency interference curve can be seen on the display screen 4, so that an operator can know the test result more directly.
When the testing device is used for carrying out the Ethernet radio frequency test, firstly, a PCB measuring clamp with an impedance control track is customized according to the structure of a cable connector; for the multiport connectors, 10mm thick insulating pads (i.e., 1.0cm thick insulating polypropylene foam boards according to the present invention) were used for testing to reduce crosstalk between differential pairs.
The testing method comprises the following steps of, when a near-end crosstalk test is carried out:
(1) laying the cables as shown in fig. 3;
(2) the network analyzer 3 is turned on, and the calibrator setting is started after preheating for 30 min: setting frequency, scanning type, number of test points, output power level and medium frequency bandwidth;
(3) utilizing a calibration kit to carry out SOLT calibration on four ports of a network analyzer 3, wherein the short circuit-open circuit-load-straight-through calibration method comprises 18 steps;
(4) after the calibration state is confirmed to be OK, adding a test track and window arrangement, setting a parameter Sdd21 for measurement, and storing a test curve after the test;
(5) and (5) judging the conformity of the test result according to the criterion requirement of the product.
When the far-end crosstalk test is performed, the cable is laid according to the method shown in fig. 4, and then the far-end crosstalk test is performed according to the same test steps as the near-end crosstalk test.
In the invention, the ordinate of the radio frequency interference curve obtained by testing is dB (decibel number), and the abscissa is HZ (frequency) curve, namely representing the change condition of the decibel number of the radio frequency interference generated along with the change of the signal output frequency; if the ordinate in the tested radio frequency interference curve exceeds the standard curve, a certain radio frequency interference exists, and the higher the decibel number is, the stronger the radio frequency interference degree is; if the ordinate does not exceed the standard curve, it indicates that the radio frequency interference is within the allowable range, and the radio frequency interference is considered to be absent.
With the development of the 1000BASE-T technology realized by using the unshielded twisted pair cable in the automobile application, the technology can improve the network performance to the speed of the gigabit Ethernet on the basis of the existing five-type line, so that the 5G network becomes the mainstream.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the design concept of the present invention should be included in the scope of the present invention.
Claims (9)
1. The utility model provides a radio frequency interference testing arrangement, arranges shielding room in for the radio frequency interference test of cable, its characterized in that: the cable comprises a cable to be tested and an interference cable; the radio frequency interference testing device comprises a testing table and an object placing table which are arranged side by side; a copper plate and an insulating plate are sequentially laid on the table top of the test table from bottom to top, and one side of the copper plate is connected with a conductor in the wall body of the shielding room for grounding treatment; a network analyzer is arranged on the object placing table, and a signal transmitting port and a signal receiving port are arranged on the network analyzer; the cable to be tested and the interference cable are arranged on an insulating plate of the test table and are connected with a signal transmitting port and a signal receiving port of the network analyzer through a PCB; the ports on the PCB that are not connected to the network analyzer are terminated with a termination resistor.
2. The radio frequency interference testing apparatus of claim 1, wherein: the network analyzer is electrically connected with a display screen, and the display screen is hung on a wall in the shielding room.
3. The radio frequency interference testing apparatus of claim 1, wherein: and the network analyzer is connected with an anti-static bracelet.
4. The radio frequency interference testing apparatus of claim 1, wherein: the resistance value of the end-capping resistor is 50 omega.
5. A method for testing radio frequency interference using the radio frequency interference testing device according to any one of claims 1 to 4, characterized by: the testing method comprises a near-end crosstalk test and a far-end crosstalk test.
6. The test method of claim 5, wherein: when the near-end crosstalk test is carried out, the used PCB comprises a first PCB and a second PCB; and during the far-end crosstalk test, the used PCB boards comprise a third PCB board and a fourth PCB board.
7. The test method of claim 6, wherein: when the near-end crosstalk is tested, the head end of the cable to be tested is connected with a signal transmitting port of the network analyzer through the first PCB, and the head end of the interference cable is connected with a signal receiving port of the network analyzer through the first PCB; after the cable to be tested and the interference cable are bent in the same U shape, the tail end of the cable to be tested and the tail end of the interference cable are connected with the second PCB.
8. The test method of claim 6, wherein: when the far-end crosstalk is tested, the head end of the cable to be tested is connected with a signal transmitting port of the network analyzer through the third PCB, and the tail end of the interference cable is connected with a signal receiving port of the network analyzer through the fourth PCB; after the cable to be tested and the interference cable are bent in the same U shape, the tail end of the cable to be tested is connected with the fourth PCB, and the head end of the interference cable is connected with the third PCB.
9. The test method of claim 7 or 8, wherein: after the cable to be tested and the interference cable are bent in the U shape, the distance h between any area of the cable to be tested and the interference cable and the edge of the insulating plate1≧ 30 mm; bending distance h formed by cables to be tested and interference cables when connecting PCB2≦ 30 mm; u-shaped line formed after bendingSpacing h between cables3≧30mm。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114636866A (en) * | 2022-04-07 | 2022-06-17 | 苏州信科检测技术有限公司 | Shielding effectiveness testing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114636866A (en) * | 2022-04-07 | 2022-06-17 | 苏州信科检测技术有限公司 | Shielding effectiveness testing device |
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