CN209878890U - Electromagnetic interference detection system - Google Patents
Electromagnetic interference detection system Download PDFInfo
- Publication number
- CN209878890U CN209878890U CN201822118532.1U CN201822118532U CN209878890U CN 209878890 U CN209878890 U CN 209878890U CN 201822118532 U CN201822118532 U CN 201822118532U CN 209878890 U CN209878890 U CN 209878890U
- Authority
- CN
- China
- Prior art keywords
- antenna
- absorbing layer
- wave
- detection system
- connector
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 33
- 238000001228 spectrum Methods 0.000 claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 230000005404 monopole Effects 0.000 claims description 5
- 230000000737 periodic effect Effects 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000012827 research and development Methods 0.000 abstract description 2
- 238000004904 shortening Methods 0.000 abstract 1
- 239000012212 insulator Substances 0.000 description 10
- 238000012356 Product development Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000011088 calibration curve Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The utility model provides an electromagnetic interference detecting system includes at least: a box, a signal amplifier and a spectrum analyzer. The wave-absorbing layer is contained in the box body and covers the surface of one inner wall of the box body; the antenna is arranged on one side of the wave-absorbing layer; the filter joint penetrates through one wall surface of the box body, and the filter joint, the antenna and the signal amplifier are respectively and electrically connected through a first shielding wire and a second shielding wire; and the spectrum analyzer is electrically connected with the signal amplifier through a third shielded wire. The box body can be placed on a movable desktop, occupies no space, and can correspond to a standard electromagnetic wave data value of a laboratory certified by international standards to establish a check line, so that the box body can be used for effectively saving detection cost and shortening the research and development time of products so as to preempt market first time.
Description
Technical Field
The present invention relates to a detection system, and more particularly to an Electromagnetic Interference (EMI) detection system capable of detecting Electromagnetic wave frequencies and amplitudes generated by small and medium-sized electronic devices.
Background
Basically, the electronic device generates electromagnetic waves during operation, and the electromagnetic waves may cause unnecessary electromagnetic interference to other electronic devices. This problem of electromagnetic interference has long been a large blind point in the design of electronic equipment and systems because of the numerous factors involved in electromagnetic interference and the wide expertise required to deal with it. Since the performance of the whole electric equipment or system is degraded due to electromagnetic interference, it is very important for product developers to detect the electromagnetic interference of electronic products.
Conventionally, electromagnetic interference detection is generally performed in a large laboratory, for example, an international standard certified laboratory (or called shielding room) with an area of about 28 square meters (7 meters long and 4 meters wide) and 3 meters high, and the standard laboratory and the testing equipment are expensive to set up, so that the cost of a single detection is relatively high. Moreover, these standard laboratories, because of the large number of waiting testers, usually require application and queue for testing, and the waiting period usually requires weeks; in certain situations, a product development engineer is required to be present during the inspection. Generally, the development process of an electronic product needs to go through several tens of times of electromagnetic wave detection, which can seriously crowd other development time courses to cause engineers to be forced to sacrifice the performance of the product in the design time of the product, resulting in poor design or delayed product time course of the product; moreover, the design direction of the product needs to be adjusted only by relying on each test result in the product development process, and as mentioned above, each detection waiting period usually takes several weeks, so that after tens of electromagnetic wave detections, the whole product development time usually takes several months to half a year.
SUMMERY OF THE UTILITY MODEL
With the high competition of science and technology industry, the current electronic products are aimed at meeting the requirements of miniaturization, high performance, high precision, high reliability, high reactivity and the like, and the life cycle of new products is shorter and shorter, and the requirement on the development cost of the whole products is reduced. Therefore, the technical problem solved by the present invention is to provide an electromagnetic interference detecting system that can operate inside a company, which can be used to effectively save the detecting cost and shorten the research and development time of products to preempt the market first.
The technical means adopted by the utility model are as follows.
The utility model provides an electromagnetic interference detecting system includes at least: a box, a signal amplifier and a spectrum analyzer. The box body is of a hollow structure, and a wave-absorbing layer is accommodated in the box body and covers the surface of one inner wall of the box body; the antenna is arranged on one side of the wave absorbing layer; a filter joint penetrating through one wall of the box body, one end of the filter joint being electrically connected with the antenna through a first shielded wire, and the signal amplifier being electrically connected with the other end of the filter joint through a second shielded wire; and the spectrum analyzer is electrically connected with the signal amplifier through a third shielded wire. The length, width and height of the box body are respectively and independently within 2 meters, so that the box body can be conveniently placed on a movable desktop and does not occupy space.
According to the above technical feature, the case is a metal case.
According to the technical characteristics, the box body is an aluminum box, an aluminum alloy box and an iron box.
According to the technical characteristics, the wave absorbing layer partially covers or completely covers the inner wall surface of the box body.
According to the technical characteristics, the antenna is arranged on the surface of the wave-absorbing layer on one side wall surface of the inner wall surface. The antenna is arranged on the surface of the wave absorbing layer on one side wall surface of the inner wall surface.
According to the technical characteristics, the antenna is arranged on the surface of the wave-absorbing layer on the upper wall surface of the inner wall surface.
According to the technical characteristics, the antenna is arranged on the surface of the wave-absorbing layer on the lower wall surface of the inner wall surface.
According to the above technical feature, the filter connector penetrates through one side wall surface of the wall surface.
According to the above technical feature, the filter connector penetrates an upper wall surface of the wall surface.
According to the above technical feature, the filter connector penetrates a lower wall surface of the wall surface.
According to the above technical features, a first shielding line is further included between the antenna and the wave-absorbing layer.
According to the above technical feature, the apparatus further comprises a computer, and the computer is electrically connected to the spectrum analyzer through a fourth shielding line.
According to the technical characteristics, the microwave absorbing layer further comprises an insulator of the object to be detected, and the insulator of the object to be detected is arranged on the surface of the wave absorbing layer.
According to the above technical feature, the wall of the box body is provided with a door panel.
According to the above technical feature, the door panel is provided with a manual switch, a pneumatic start switch or an electric motor start switch.
According to the technical characteristics, the box body is a metal box body, the wave-absorbing layer is completely covered on the inner wall surface of the box body, the antenna is arranged on one side of the wave-absorbing layer on the lower wall surface of the inner wall surface, the filter joint penetrates through one side wall surface of the wall surface, the first shielding wire is arranged between the antenna and the wave-absorbing layer, an insulator of an object to be detected is arranged on the surface of the wave-absorbing layer, and the wall surface of the box body is provided with a door plate.
According to the above technical features, the case is a polyhedron or a round body.
According to the above technical features, the box body is cubic.
According to the above technical features, the Antenna is at least one selected from the group consisting of a Biconical Antenna (Biconical Antenna), a Log periodic Antenna (Log periodic Antenna), a wideband Antenna (comblogging Antenna), a Half-wave Dipole Antenna (Half wave tuned Dipole Antenna), a horn Antenna (Double ridge horn Antenna), a loop Antenna (active loop Antenna), and a Monopole Antenna (Monopole Antenna).
According to the above technical feature, the filter connector is at least one selected from the group consisting of a dc power connector, an ac power connector, a USB connector, an RJ45 signal connector, an RS232 connector, an SMA connector, an N-type connector and a BNC connector.
According to the above technical features, the first shielded wire, the second shielded wire, the third shielded wire and the fourth shielded wire are Coaxial shielded wires (Coaxial shielding wires) independently.
According to the above feature, the signal amplifier is either internal or external to the spectrum analyzer.
According to the technical characteristics, the wave-absorbing layer is a wave-absorbing film, an angular cone wave-absorbing layer, a wedge wave-absorbing layer or a flat wave-absorbing layer.
The utility model discloses produced technological effect: the utility model provides an this electromagnetic interference detecting system utilizes small-size this box to place an determinand in this box, keeps apart outside this box with the irrelevant electromagnetic wave of this determinand, and the electromagnetic wave that this antenna sensing in this box arrived is exactly the produced electromagnetic wave of this determinand. The utility model discloses the box size that uses is about 1.2 percent of current shielding room size but does not prescribe a limit to this numerical value, so the utility model discloses an electromagnetic interference detecting system as long as put on general laboratory table just can, compare in large-scale shielding room all have very big advantage in setting up cost and structural, save very big set up cost and place the space. The middle and small-sized enterprise just can set up inside the company easily the utility model discloses an electromagnetic interference detecting system shortens the time at product development.
Drawings
Fig. 1 is a perspective view of the present invention.
Fig. 2 is a structural sectional view of the present invention.
Fig. 3A is the wave-absorbing film of the present invention.
Fig. 3B is a schematic view of the pyramid absorbing layer of the present invention.
Fig. 3C is a schematic view of the wedge-shaped wave-absorbing layer of the present invention.
Fig. 3D is a schematic view of the flat wave-absorbing layer of the present invention.
Fig. 4 is a flowchart of the electromagnetic interference correction method of the present invention.
Description of the figure numbers:
1 electromagnetic interference detection system
10 case body
100 wave-absorbing layer
101 antenna
102 filter connector
103 first shielded wire
104 antenna dielectric
105 door panel
11 signal amplifier
12 spectrum analyzer
13 second shielded wire
14 third shielded wire
15 computer
16 fourth shielded wire
17 insulator of object to be measured
S inner wall surface
SW sidewall surface
SU upper wall surface
SD lower wall surface
W wall surface
WS side wall surface
WU Upper wall surface
WD lower wall
100a wave-absorbing film
100b pyramid wave-absorbing layer
100c wedge-shaped wave absorbing layer
100d flat wave absorbing layer
S1 ~ S5 step.
Detailed Description
First, please refer to the perspective view and the structural cross-sectional view shown in fig. 1 and fig. 2, which are the electromagnetic interference detecting system of the present invention, at least comprising: a housing 10, a signal amplifier 11 and a spectrum analyzer 12.
The box body 10 is a hollow structure, and contains: a wave-absorbing layer 100, an antenna 101 and a filter connector 102. The wave-absorbing layer 100 covers an inner wall surface S of the box 10 to absorb electromagnetic waves emitted from an object to be detected (not shown) and prevent the electromagnetic waves from being continuously reflected by the inner wall surface S to affect the detection accuracy, and also prevent external electromagnetic waves from entering the box 10 to affect the detection accuracy. The wave-absorbing layer 100 may be in the form of a wave-absorbing film 100a (as shown in fig. 3A), an angular cone wave-absorbing layer 100B (as shown in fig. 3B), a wedge wave-absorbing layer 100C (as shown in fig. 3C), or a flat wave-absorbing layer 100D (as shown in fig. 3D). Preferably, the wave-absorbing layer 100 covers partially or completely the inner wall surface S of the box 10, and in a more preferred embodiment, the wave-absorbing layer 100 covers completely the inner wall surface S of the box 10, so as to completely absorb the electromagnetic waves of the object to be tested and completely block the external electromagnetic waves. The box body 10 is a metal box body, and can be an aluminum box, an aluminum alloy box or an iron box; and the case 10 may be polyhedral, circular, or cubic. The wall W of the housing 10 is provided with a door 105, and the door 105 is provided with a manual switch, an air pressure switch or an electric motor switch to allow the object to be tested to enter and exit the shielding box. In this embodiment, the length, width and height of the box 10 are independently within 2 meters, so that the box 10 can be conveniently placed on a movable table (not numbered) and does not occupy space.
The Antenna 101 is disposed on one side of the Wave-absorbing layer 100, and further the Antenna 101 may be disposed on a side wall surface SW of the inner wall surface S, an upper wall surface SU or a surface of the Wave-absorbing layer 100 of the lower wall surface SD for receiving the electromagnetic Wave radiated by the object to be measured and converting the electromagnetic Wave into an electromagnetic signal, and the Antenna 101 is selected from at least one of a group consisting of a biconical Antenna (biconical Antenna), a Log periodic Antenna (Log periodic Antenna), a broadband Antenna (combo Antenna), a Half-Wave Dipole Antenna (Half Wave Tuned Dipole Antenna), a horn Antenna (Double horn Antenna), a Loop Antenna (Active Loop Antenna) and a Monopole Antenna (Monopole Antenna). In a preferred embodiment, the antenna 101 is disposed on one side of the wave-absorbing layer 100 of the bottom wall surface SD, for example: the antenna 101 is disposed on the surface of the wave-absorbing layer 100 in a manner of placement, so as to facilitate replacement and movement.
The filter connector 102 penetrates a wall W of the housing 10, and further the filter connector 102 may penetrate a side wall WS, an upper wall WU or a lower wall WD of the wall W; one end of the filter connector 102 is electrically connected to the antenna 101 by a first shielding wire 103, so that the electromagnetic signal is input from the antenna 101 to the filter connector 102 through the first shielding wire 103, and the first shielding wire 103 can prevent the electromagnetic signal from being affected by the electromagnetic wave radiated by the object to be tested during the transmission process. The other end of the filter connector 102 is electrically connected to the signal amplifier 11 through a second shielding wire 13, the electromagnetic signal is input to the signal amplifier 11 through the filter connector 102 through the second shielding wire 13, and the second shielding wire 13 can prevent the electromagnetic signal from being affected by the free electromagnetic wave from the atmosphere outside the housing 10 during the transmission process. And the filter connector 102 is at least one selected from the group consisting of a dc power connector, an ac power connector, a USB connector, an RJ45 signal connector, an RS232 connector, an SMA connector, an N-type connector, and a BNC connector, the filter connector 102 being used to remove unwanted noise. In a preferred embodiment, the filter connector 102 can penetrate the sidewall WS of the wall W to facilitate easy disconnection and replacement. The signal amplifier 11 is used for amplifying the output power of the electromagnetic signal.
The spectrum analyzer 12 is electrically connected to the signal amplifier 11 by a third shielding wire 14, the electromagnetic signal is transmitted from the signal amplifier 11 to the spectrum analyzer 12 by the third shielding wire 14, the third shielding wire 14 is used to prevent the electromagnetic signal from being affected by free electromagnetic waves in the atmosphere outside the box 10 during transmission, and the spectrum analyzer 12 can detect the frequency and amplitude of the electromagnetic signal.
The spectrum analyzer 12 is electrically connected to a computer 15 by a fourth shielding wire 16, the electromagnetic signal is transmitted from the spectrum analyzer 12 to the computer 15 by the fourth shielding wire 16, the fourth shielding wire 16 is used for preventing the electromagnetic signal from being affected by free electromagnetic waves in the atmosphere outside the box 10 during transmission, and the computer 15 is used for observing and processing the electromagnetic signal. The signal amplifier 11 may be internal or external to the spectrum analyzer 12. In a preferred embodiment, the third shielding wire 14 is electrically connected between the spectrum analyzer 12 and the signal amplifier 11, the fourth shielding wire 16 is electrically connected between the spectrum analyzer 12 and the computer 15, and the signal amplifier 11 is outside the spectrum analyzer 12, so as to facilitate detecting the frequency and amplitude of the amplified electromagnetic signal, and further observe and analyze data related to the electromagnetic wave. Specifically, the first shielded wire 103, the second shielded wire 13, the third shielded wire 14 and the fourth shielded wire 16 are Coaxial shielded wires (Coaxial shielding lines) independently.
The box 10 further includes an antenna insulator 104 and an insulator 17 for an object to be tested, wherein the antenna insulator 104 is disposed between the antenna 101 and the wave-absorbing layer 100 for isolating and preventing the antenna 101 from being electrically conducted with the box 10, thereby reducing experimental errors. The insulator 17 is disposed between the wave-absorbing layer 100 and the object to be tested, and is used for isolating and preventing the occurrence of the conduction between the object to be tested and the box 10, thereby reducing the experimental error.
In the best embodiment of the electromagnetic interference detecting system of the present invention, the box body 10 is a metal box body, the wave-absorbing layer 100 is completely covered on the inner wall surface S of the box body 10, the antenna 101 is disposed on one side of the wave-absorbing layer 100 of the lower wall surface SD of the inner wall surface S, the filter connector 102 runs through the side wall surface WS of the wall surface W, the antenna insulator 104 is disposed between the antenna 101 and the wave-absorbing layer 100, the insulator 17 to be tested is disposed on the surface of the wave-absorbing layer 100, and the wall surface W of the box body 10 is provided with the door panel 105.
Referring to fig. 4, an emi calibration method can be performed by the emi detection system, and the emi calibration method includes the following steps.
Step S1: at least 5 of the analytes (e.g., electronic device samples) are obtained.
Step S2: the 5 objects to be tested are sent to the laboratory of international standard certification to obtain a corresponding standard electromagnetic wave data value (including frequency and amplitude).
Step S3: the electromagnetic interference detection system is used to sequentially detect the 5 objects to be detected, so as to respectively obtain a reference electromagnetic wave data value (including frequency and amplitude) corresponding to the 5 objects to be detected.
Step S4: the reference electromagnetic wave data value is set as the X-axis, the standard electromagnetic wave data value is set as the Y-axis, and an inspection line is drawn.
Step S5: the electromagnetic interference detection system is used for measuring an electromagnetic wave data value of an object to be measured, and the calibration curve is compared, so that the corresponding standard electromagnetic wave data value can be calculated.
Therefore, an object to be measured can be measured in an enterprise, the electromagnetic wave data value is measured by the electromagnetic interference detection system, the corresponding standard electromagnetic wave data value is obtained by comparing the calibration line, the detection result can be effectively used for adjusting the design direction of a product, the queuing time of a waiting international standard authentication laboratory and the required high detection cost are greatly reduced, the development timeliness of a new product is accelerated, the product development risk and cost are reduced, and the self competitive advantage of the enterprise is improved.
Claims (13)
1. An electromagnetic interference detection system, characterized in that the electromagnetic interference detection system (1) comprises at least:
a box body (10) which is a hollow structure, the length, width and height of the box body (10) are respectively and independently within 2 meters, and the box body (10) internally contains:
a wave-absorbing layer (100) covering an inner wall surface (S) of the case (10);
an antenna (101) arranged on one side of the wave-absorbing layer (100);
a filter connector (102) penetrating a wall (W) of the box (10), one end of the filter connector (102) being electrically connected to the antenna (101) by a first shielding wire (103);
a signal amplifier (11), the other end of the signal amplifier (11) and the filter joint (102) are electrically connected by a second shielding wire (13); and
a spectrum analyzer (12), wherein the spectrum analyzer (12) is electrically connected with the signal amplifier (11) by a third shielding wire (14).
2. The electromagnetic interference detection system of claim 1, characterized in that the housing (10) is a metal housing.
3. The EMI detection system as claimed in claim 1, wherein said wall (W) of said housing (10) is provided with a door panel (105), said door panel (105) being provided with a manual switch, a pneumatic switch or an electric motor switch.
4. The EMI detection system as claimed in claim 1, wherein said wave-absorbing layer (100) covers partially or completely said inner wall surface (S) of said housing (10).
5. The EMI detection system according to claim 1, wherein the antenna (101) is disposed on a surface of the wave-absorbing layer (100) of a sidewall Surface (SW) of the inner wall surface (S), a surface of the wave-absorbing layer (100) of an upper wall Surface (SU), or a surface of the wave-absorbing layer (100) of a lower wall Surface (SD).
6. The EMI detection system as set forth in claim 1, wherein the filter connector (102) extends through one of the wall (W) and one of the Wall (WS), the upper Wall (WU) and the lower Wall (WD).
7. The EMI detection system as claimed in claim 1, including a computer (15), and said computer (15) is electrically connected to said spectrum analyzer (12) by a fourth shielded wire (16).
8. The electromagnetic interference detection system of claim 1, characterized in that the housing (10) is polyhedral, circular or cubic.
9. The EMI detection system of claim 1, wherein the antenna (101) is at least one selected from the group consisting of a bicone antenna, a log periodic antenna, a broadband antenna, a half-wave dipole antenna, a horn antenna, a loop antenna, and a monopole antenna.
10. The EMI detection system as set forth in claim 1, wherein said filter connector (102) is at least one selected from the group consisting of a DC power connector, an AC power connector, a USB connector, an RJ45 signal connector, an RS232 connector, an SMA connector, an N-type connector, and a BNC connector.
11. The EMI detection system of claim 7, wherein the first shielded wire (103), the second shielded wire (13), the third shielded wire (14), and the fourth shielded wire (16) are each independently coaxial shielded wires.
12. The electromagnetic interference detection system according to claim 1, characterized in that the signal amplifier (11) is internal or external to the spectrum analyzer (12).
13. The EMI detection system according to claim 1, wherein the absorbing layer (100) is an absorbing film (100a), an angular cone absorbing layer (100b), a wedge absorbing layer (100c) or a plate absorbing layer (100 d).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW107104227 | 2018-02-05 | ||
| TW107104227A TWI676811B (en) | 2018-02-05 | 2018-02-05 | Electromagnetic interference test system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209878890U true CN209878890U (en) | 2019-12-31 |
Family
ID=65895129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822118532.1U Active CN209878890U (en) | 2018-02-05 | 2018-12-17 | Electromagnetic interference detection system |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3220695U (en) |
| CN (1) | CN209878890U (en) |
| TW (1) | TWI676811B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWM360366U (en) * | 2009-02-11 | 2009-07-01 | Smartant Telecom Co Ltd | Integrated antenna module characteristics testing equipment |
| CN103630777A (en) * | 2013-11-19 | 2014-03-12 | 陕西海泰电子有限责任公司 | Electric equipment shielding effectiveness test system and method |
| CN104360178B (en) * | 2014-10-30 | 2018-02-02 | 东北电力大学 | A kind of inverter low-frequency noise measurement and method for diagnosing faults |
| CN105680248B (en) * | 2016-03-25 | 2019-01-29 | 冠捷显示科技（中国）有限公司 | Data-interface terminal shielding structure and its application |
-
2018
- 2018-02-05 TW TW107104227A patent/TWI676811B/en active
- 2018-12-17 CN CN201822118532.1U patent/CN209878890U/en active Active
-
2019
- 2019-01-15 JP JP2019000089U patent/JP3220695U/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP3220695U (en) | 2019-03-28 |
| TW201935027A (en) | 2019-09-01 |
| TWI676811B (en) | 2019-11-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102749539B (en) | Fast electromagnetic compatibility test and diagnosis system with quantization electromagnetic interference | |
| CN2869870Y (en) | Electric-field probe for electromagnetic compatibility near-field detection | |
| US8073641B2 (en) | Electromagnetic field distribution measuring method, apparatus for the method, computer program and information recording medium | |
| KR20140120331A (en) | System for analyzing and locating partial discharges | |
| CN109884407B (en) | Electromagnetic shielding effectiveness measuring system and measuring method | |
| CN105891761A (en) | Scattering parameter-based partial discharge ultrahigh frequency detection system field check method | |
| CN106992798B (en) | Passive intermodulation test method based on slot waveguide near-field coupling | |
| US20090184719A1 (en) | Ic testing environment investigative device and method | |
| CN108008279B (en) | Circuit radio frequency noise test system, method and device | |
| CN118101084B (en) | Performance detection method and system based on radio frequency device | |
| CN202305058U (en) | Resonance type SAW temperature sensor automatic test system | |
| CN105425060B (en) | A kind of interference detection method and detecting system of antenna coupling | |
| CN209878890U (en) | Electromagnetic interference detection system | |
| CN106353589A (en) | Coupling detector | |
| CN105891261A (en) | Plating material passive intermodulation online testing device based on dual-mode transmission line structures | |
| CN2932403Y (en) | HV combined electric appliance partial discharge detector | |
| CN115032465A (en) | Radiation stray determination method, device and system | |
| US20120098732A1 (en) | Emi detection apparatus | |
| CN109884406B (en) | High-frequency electromagnetic shielding effectiveness measuring system, measuring method and device | |
| CN211183962U (en) | Handheld radio frequency radiation immunity fault accurate diagnosis equipment | |
| CN106405341A (en) | Method used for reducing partial discharge ultrahigh frequency signal | |
| CN115243310B (en) | Wireless transmission signal anti-interference test method and system based on change curve characteristics | |
| KR101899010B1 (en) | Partial discharge diagnose apparatus and method based on time-pulse relation analysys | |
| JP2009025059A (en) | Emi-measuring system and emi measurement method | |
| CN211086444U (en) | Electromagnetic environment testing device for aviation radio navigation station |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |