CN112763824B - Comprehensive test box and test method - Google Patents
Comprehensive test box and test method Download PDFInfo
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- CN112763824B CN112763824B CN202011553390.7A CN202011553390A CN112763824B CN 112763824 B CN112763824 B CN 112763824B CN 202011553390 A CN202011553390 A CN 202011553390A CN 112763824 B CN112763824 B CN 112763824B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/003—Environmental or reliability tests
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Abstract
The invention relates to a comprehensive test box and a test method, belongs to the field of electromagnetic compatibility tests and comprehensive environment tests, and solves the problem that in the prior art, the electromagnetic environment and the natural environment of a product in actual working cannot be simulated simultaneously. The comprehensive test box comprises a transmitting antenna, a receiving antenna and a test box door, wherein the transmitting antenna and the receiving antenna are arranged on a first side wall of the comprehensive test box, the test box door is arranged on a second side wall of the comprehensive test box, and the first side wall is perpendicular to the second side wall. The invention realizes the comprehensive test method of loading the electromagnetic environment and the natural environment in one test box, meets the environment adaptability test requirement of the product under the comprehensive action of different environmental factors, simulates the electromagnetic environment and the natural environment suffered by the product in actual work, and can fully verify the real environment adaptability of the product.
Description
Technical Field
The invention relates to the field of electromagnetic compatibility tests and comprehensive environment tests, in particular to a comprehensive test box and a test method.
Background
The coupling effect of environmental factors generally amplifies the effect of a single factor. A large number of equipment reliability tests may demonstrate that equipment that has not failed through higher magnitude functional vibration and temperature cycling tests fails in performing a reliability integrated environment test. The circuit board of a general electronic device is mounted in a casing, and finally placed on an internal support structure in a square or rectangular box-shaped shape. For easy disassembly and maintenance, sealing is generally not performed. The electronic device housing gap may change due to environmental changes or vibration shadows during use. When the slot length reaches 1/2 wavelength or an integer multiple of 1/2 wavelength, the slot becomes a very efficient radiating antenna, causing leakage of electromagnetic energy, and causing deterioration of electromagnetic compatibility of internal electronic devices. For an interconnect cable of a device, the environmental effects of high temperature on the cable are represented by: resulting in discoloration, cracking or cracking of the cable and deterioration of electrical properties. The environmental effects of low temperature on the cable are mainly expressed as follows: resulting in embrittlement of the cable and deterioration of impact resistance. The change of temperature and humidity can cause various environmental effects of the cable, such as chemical aging, expansion of the cable due to moisture absorption, change of internal stress, fluctuation of electrical performance and the like.
Throughout the literature, the following problems are evident in each of the relevant electromagnetic compatibility tests and natural environment test standards: firstly, the radiation sensitivity examination of the electromagnetic environment can be carried out only at normal temperature, and the influence examination of natural environment factors such as high temperature, low temperature, damp heat and the like on products is lacked; secondly, when the natural environment test is carried out, the radiation sensitivity test of the electromagnetic environment is lacked. Because electromagnetic environment and natural environment influence suffered by the product in actual working cannot be simulated at the same time, the adaptability verification of the product to the actual environment is insufficient.
In order to solve the problems, the invention provides a comprehensive test box and a test method, and the test method for loading the electromagnetic environment and the natural environment in the same test box simultaneously is realized by building the test environment of the electromagnetic reverberation chamber, so that the environmental adaptability of the product under the comprehensive action of different environmental factors is checked. Compared with the existing electromagnetic environment test and natural environment test, the invention has the characteristics of combining different types of environment factors and simultaneously testing, can simulate the real environment of the product, and has more complete assessment.
Disclosure of Invention
In view of the above analysis, the present invention aims to provide a comprehensive test box and a test method, which are used for solving the problem that in the prior art, electromagnetic environment and natural environment of a product in actual working cannot be simulated at the same time.
In one aspect, the invention provides a comprehensive test box comprising a transmitting antenna, a receiving antenna and a test box door, wherein the transmitting antenna and the receiving antenna are arranged on a first side wall of the comprehensive test box, the test box door is arranged on a second side wall of the comprehensive test box, and the first side wall is perpendicular to the second side wall.
Further, a shielding rubber strip is arranged on the test box door and used for guaranteeing electromagnetic shielding effectiveness of the test box door.
Further, the shielding rubber strip is of a hollow structure.
Further, the transmitting antenna and the receiving antenna are made of alloy steel surface electroplating materials.
Further, the comprehensive test box further comprises a galvanized steel sheet, and the galvanized steel sheet is arranged on the inner wall of the comprehensive test box.
Further, the comprehensive test box further comprises a stirrer, an air inlet and an air outlet, wherein the air inlet and the air outlet are positioned on one side of the stirrer.
Further, the stirrer comprises a stirring shaft of the reverberation room stirrer, a stirrer blade and a stirrer motor, wherein the stirrer blade is fixed on the stirring shaft of the reverberation room stirrer, and the stirrer motor drives the stirring shaft of the reverberation room stirrer to rotate at a constant speed.
Further, a test box observation window is arranged on a side wall III of the comprehensive test box, and the side wall III is perpendicular to the side wall II.
Furthermore, the glass of the observation window of the test box is shielding glass, so that leakage of electromagnetic signals in the test box can be avoided.
On the other hand, the invention provides a test method of the comprehensive test box, which adopts the comprehensive test box and comprises the following steps:
step 1: assembling a test box;
step 2: comprehensive test;
step 3: control analysis.
Further, the comprehensive test box further comprises a natural environment test box compressor unit, and the natural environment test box compressor unit is located on the other side of the air inlet and the air outlet and opposite to the stirrer.
Further, the comprehensive test box further comprises a ventilation cut-off waveguide, and the ventilation cut-off waveguide is arranged on the air inlet and the air outlet.
Further, the ventilation cut-off waveguide is made of low carbon steel, and the surface of the ventilation cut-off waveguide is galvanized.
Compared with the prior art, the invention has at least one of the following beneficial effects:
1. the invention uses the high-temperature and low-temperature resistant shielding rubber strip in a hollow form, the deformation of the shielding rubber strip is increased by the hollow design, the shielding rubber strip can be better attached to the test box door, and the electromagnetic shielding effectiveness of the test box door is ensured.
2. The box body of the electromagnetic environment and natural environment comprehensive test box is a stainless steel inner wall, and the galvanized steel sheet is additionally arranged on the inner wall, so that the high conductivity of the inner surface of the box body is ensured.
3. According to the invention, the ventilation cut-off waveguide is arranged at the air inlet and the air outlet, so that the leakage of electromagnetic energy is effectively prevented, the integral electromagnetic shielding function of the test box is ensured, and the uniformity of the electromagnetic environment of the test box is ensured. Meanwhile, the ventilation cut-off waveguide is made of low-carbon steel, and the surface of the ventilation cut-off waveguide is galvanized to obtain high conductivity.
4. The transmitting antenna and the receiving antenna in the comprehensive test box are made of alloy steel surface electroplating materials, so that the high-temperature, low-temperature and damp-heat environment in the test box is effectively adapted.
5. The observation window of the comprehensive test box uses shielding glass, so that leakage of electromagnetic signals is effectively avoided.
6. According to the invention, through a step-by-step stirring mode reverberation room method, a comprehensive test method for loading the electromagnetic environment and the natural environment in one test box simultaneously is realized, the environment adaptability test requirement of the product under the comprehensive action of different environmental factors is met, the electromagnetic environment and the natural environment suffered by the product in actual working are simulated, and the real environment adaptability of the product can be fully verified.
In the invention, the technical schemes can be mutually combined to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, like reference numerals being used to refer to like parts throughout the several views.
FIG. 1 is a schematic diagram of a comprehensive test box;
FIG. 2 is a front view of a vent cutoff waveguide;
FIG. 3 is a side view of a vent cutoff waveguide;
fig. 4 is a cross-sectional view of a shielding rubber strip.
Reference numerals:
1-a mixing shaft of a mixing chamber mixer; 2-stirrer blades; 3-a stirrer motor; 4-transmitting antennas; 5-receiving an antenna; a 6-power amplifier; 7-a signal source; 8-a measurement receiver; 9-shielding rubber strips; 10-a test box door; 11-a natural environment test box compressor unit; 12-a ventilation cut-off waveguide; 13-galvanized steel sheet.
Detailed Description
Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and together with the description serve to explain the principles of the invention, and are not intended to limit the scope of the invention.
In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the term "coupled" should be interpreted broadly, for example, as being fixedly coupled, detachably coupled, integrally coupled, mechanically coupled, electrically coupled, directly coupled, or indirectly coupled via an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The terms "top," "bottom," "above … …," "below," and "on … …" are used throughout the description to refer to the relative positions of components of the device, such as the relative positions of the top and bottom substrates inside the device. It will be appreciated that the devices are versatile, irrespective of their orientation in space.
Example 1
In one embodiment of the invention, a comprehensive test box and a test method are disclosed, and as shown in fig. 1-4, the comprehensive test box comprises a stirrer, a transmitting antenna 4, a receiving antenna 5, a power amplifier 6, a signal source 7, a measuring receiver 8, a shielding rubber strip 9, a test box door 10, a natural environment test box compressor unit 11, a ventilation cut-off waveguide 12 and a galvanized steel sheet 13. The natural environment test box compressor unit 11 is located the outside one end of air intake and air outlet of test box, and the agitator is located the air intake and the air outlet inboard of test box, and ventilation cut-off waveguide 12 is installed on air intake and air outlet, and transmitting antenna 4 and receiving antenna 5 are installed on the lateral wall one of test box, and test box door 10 is located the lateral wall two of test box, and wherein lateral wall one and lateral wall two are perpendicular relation.
It should be noted that, the natural environment test box compressor unit outputs cold air and hot air, and the cold air and the hot air are blown in or blown out of the circulation channel of the comprehensive test box through the air inlet and the air outlet, finally reach the set natural environment test conditions through multiple air circulation, set the ventilation cut-off waveguide at the air inlet and the air outlet, prevent the leakage of electromagnetic energy, ensure the overall electromagnetic shielding effectiveness of the test box, and ensure the uniformity of the electromagnetic environment of the test box.
Preferably, the vent cutoff waveguide 12 of the integrated test chamber is made of low carbon steel and the surface is galvanized to obtain high electrical conductivity.
The agitator is installed in one side of air intake and air outlet, and is relative with natural environment test box compressor unit 11, including reverberation room agitator (mixing) shaft 1, agitator paddle 2 and agitator motor 3, on the reverberation room agitator (mixing) shaft 1 is fixed in to agitator paddle 2, and agitator motor 3 drives reverberation room agitator (mixing) shaft 1 at the uniform velocity and rotates, and the electromagnetic wave in the synthetic test box is reflected to agitator paddle 2 on the reverberation room agitator (mixing) shaft 1, produces the electromagnetic field of statistics even, and specifically, reverberation room agitator (mixing) shaft 1 horizontal installation is in one side near air intake and air outlet.
It should be noted that, the electromagnetic wave emitted by the transmitting antenna into the comprehensive test box is uniformly reflected into the comprehensive test box by the stirrer, so as to excite different modes of the electromagnetic wave in the comprehensive test box, change the standing wave diagram in the comprehensive test box, generate a statistically uniform electromagnetic field, and under the condition of specific power input, the electromagnetic environment field intensity in the comprehensive test box is stronger.
Electromagnetic signals generated by the signal source 7 are amplified by the power amplifier 6 and transmitted into the comprehensive test box through the transmitting antenna 4. The receiving antenna 5 is used for measuring the electromagnetic environment in which the receiving antenna 5 is located, and the measuring signal is transmitted to the measuring receiver 8, and the receiver 8 displays the measuring field strength.
Preferably, the transmitting antenna 4 and the receiving antenna 5 in the comprehensive test box are made of alloy steel surface plating materials so as to adapt to high-low temperature and damp-heat environments in the comprehensive test box.
The shielding rubber strip 9 is stuck on the test box door 10. The inner wall of the stainless steel of the box body of the comprehensive test box is additionally provided with a galvanized steel sheet 13. And a third side wall of the comprehensive test box is provided with a test box observation window, the third side wall and the second side wall are in vertical relation, and the observation window of the comprehensive test box uses shielding glass to avoid electromagnetic signal leakage.
Preferably, the shielding rubber strip 9 is designed into a hollow structure so as to increase the deformation amount of the shielding rubber strip 9, and the shielding rubber strip is better attached to the test box door 10, so that the electromagnetic shielding effectiveness of the test box door 10 is ensured.
It should be noted that, install the shielding rubber strip on the test chamber door, increased the gas tightness of comprehensive test chamber, in addition, the shielding rubber strip has improved the electromagnetic shielding effectiveness of test chamber door, prevents the leakage of electromagnetic energy.
Compared with the prior art, the comprehensive test method for loading the electromagnetic environment and the natural environment in the same test box simultaneously is realized by the step-by-step stirring mode reverberation room method, and the environment adaptability test requirement of the product under the comprehensive action of different environmental factors is met. The invention uses the high-temperature and low-temperature resistant shielding rubber strip in a hollow form, the deformation of the shielding rubber strip is increased by the hollow design, the shielding rubber strip can be better attached to the test box door, and the electromagnetic shielding effectiveness of the test box door is ensured. The box body of the electromagnetic environment and natural environment comprehensive test box is a stainless steel inner wall, and the galvanized steel sheet is additionally arranged on the inner wall, so that the high conductivity of the inner surface of the box body is ensured. The invention can simulate the electromagnetic environment and the natural environment of the product in the same test box when the product actually works, and can fully verify the adaptability of the real environment of the product.
Example 2
In another embodiment of the present invention, a test method for a comprehensive test chamber is disclosed, comprising the steps of:
step 1: assembling a test box;
a shielding rubber strip 9 is stuck on a test box door 10, a galvanized steel plate 13 is additionally arranged on the inner wall of a stainless steel box body of the comprehensive test box, a ventilation stop waveguide 12 is arranged at an air inlet and an air outlet of the comprehensive test box, and a stirrer is horizontally arranged at the center height position close to the inner wall of the air inlet and the air outlet of the comprehensive test box.
Step 2: comprehensive test;
and (3) checking the electromagnetic reverberation room according to the requirements of GJB151B-2013 annex D. According to the requirements of GJB151B-2013, performing electromagnetic environment radiation sensitivity test under normal temperature state; performing a low-temperature test according to low-temperature test conditions specified by the outline; after the temperature balance is achieved, carrying out product performance test and electromagnetic environment radiation sensitivity test under the low-temperature condition; performing a high-temperature test according to the high-temperature test conditions specified by the outline; after the temperature balance is achieved, product performance test and electromagnetic environment radiation sensitivity test under the high temperature condition are carried out.
Step 3: control analysis.
And (3) integrating the test results of the step (2) to perform control analysis for use in various stages of product development tests, acceptance tests, production tests and the like.
Illustratively, the test method of the comprehensive test chamber comprises the following steps:
step 1: assembling a test box;
a shielding rubber strip 9 is stuck on a test box door 10, a galvanized steel plate 13 is additionally arranged on the inner wall of a stainless steel box body of the comprehensive test box, a ventilation stop waveguide 12 is arranged at an air inlet and an air outlet of the comprehensive test box, and a stirrer is horizontally arranged at the center height position close to the inner wall of the air inlet and the air outlet of the comprehensive test box.
Step 2: comprehensive test;
step 201: performing electromagnetic environment field uniformity calibration test under normal temperature environment to obtain a field uniformity region of the comprehensive test box;
step 202: in a normal temperature environment, the test equipment and the tested product are electrified and preheated to reach a stable working state;
step 203: setting a signal source at a test starting frequency, and modulating by adopting 1kHz and 50% duty ratio square waves;
step 204: the injection forward power required for reaching the expected field intensity can be calculated by utilizing the expected test field intensity and the field intensity difference value obtained during verification, the peak forward power equal to the calculated value is injected into the comprehensive test box, and interpolation values are used between the calibration points;
step 205: adjusting the measuring receiver 8 or the sensor display device, displaying the signal measured at the receiving antenna 4 or the sensor, confirming the existence of the electric field;
step 206: scanning in a test frequency range according to the requirements of GJB151B-2013, completing electromagnetic environment test of all frequency bands, and monitoring whether the tested product is sensitive. If the detected product is sensitive, determining a sensitivity threshold level according to GJB151B-2013 4.3.11.5.4;
step 207: starting a natural environment test box compressor unit 11 according to natural environment test conditions specified by a test outline, and loading low-temperature, high-temperature and other environmental conditions;
step 208: after the environment temperature reaches a stable state, repeating the steps 202 to 206, scanning in a test frequency range according to the requirements of GJB151B-2013, completing electromagnetic environment test of all frequency bands, and monitoring whether the tested product is sensitive;
step 209: and (3) sequentially loading other natural environment test conditions specified by the test outline, repeating the steps 202 to 206 after the environment temperature is stable, scanning in a test frequency range according to the requirements of the GJB151B-2013, completing electromagnetic environment test of all frequency bands, and monitoring whether the tested product is sensitive.
Step 3: control analysis.
And (3) synthesizing the test result of the step (2), and performing control analysis for use in various stages of product development tests, acceptance tests, production tests and the like.
Compared with the prior art, the comprehensive test method for the electromagnetic environment and the natural environment overcomes the limitation that the electromagnetic environment and the natural environment cannot be applied to the tested product at the same time, realizes the test method for the combined action of multiple environment factors, and provides important guiding significance for guiding and verifying the environment adaptability work of the product under the coupling action of the multiple environment factors.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.
Claims (5)
1. The test method of the comprehensive test box is characterized by comprising the following steps of:
step 1: assembling a comprehensive test box;
the comprehensive test box comprises a transmitting antenna (4), a receiving antenna (5), a power amplifier (6), a signal source (7), a measuring receiver (8), a test box door (10), a natural environment test box compressor unit (11), a ventilation cut-off waveguide (12), a galvanized steel sheet (13) and a stirrer, wherein the transmitting antenna (4) and the receiving antenna (5) are arranged on a first side wall of the comprehensive test box, the test box door (10) is arranged on a second side wall of the comprehensive test box, and the first side wall is perpendicular to the second side wall; a shielding rubber strip (9) is arranged on the test box door (10), and the shielding rubber strip (9) is of a hollow structure; the transmitting antenna (4) and the receiving antenna (5) are made of alloy steel surface electroplating materials; the galvanized steel sheet (13) is arranged on the inner wall of the comprehensive test box; the natural environment test box compressor unit (11) is positioned at one end outside the air inlet and the air outlet of the test box; the ventilation cut-off waveguide (12) is arranged on the air inlet and the air outlet;
the electromagnetic signals generated by the signal source (7) are amplified by the power amplifier (6) and transmitted into the comprehensive test box through the transmitting antenna (4); the receiving antenna (5) is used for measuring the electromagnetic environment of the position of the receiving antenna (5), transmitting a measuring signal to the measuring receiver (8), and displaying the measuring field intensity by the measuring receiver (8);
the stirrer comprises a reverberation room stirrer stirring shaft (1), stirrer blades (2) and a stirrer motor (3), wherein the stirrer blades (2) are fixed on the reverberation room stirrer stirring shaft (1), the stirrer motor (3) drives the reverberation room stirrer stirring shaft (1) to rotate at a constant speed, and the stirrer blades (2) on the reverberation room stirrer stirring shaft (1) reflect electromagnetic waves in the comprehensive test box to generate a statistically uniform electromagnetic field;
step 2: comprehensive test;
step 3: control analysis.
2. Test method of a comprehensive test chamber according to claim 1, characterized in that the shielding rubber strip (9) is used to ensure the electromagnetic shielding effectiveness of the test chamber door (10).
3. The method of testing a comprehensive test chamber according to claim 1, wherein the comprehensive test chamber further comprises an air inlet and an air outlet, the air inlet and the air outlet being located on one side of the stirrer.
4. The method for testing a comprehensive test box according to claim 1, wherein the comprehensive test box further comprises a side wall three, the side wall three is perpendicular to the side wall two, and a test box observation window is arranged on the side wall three.
5. The method according to claim 4, wherein the glass of the observation window of the test chamber is a shielding glass, so that leakage of electromagnetic signals in the test chamber can be avoided.
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| CN114252388A (en) * | 2021-11-23 | 2022-03-29 | 国高材高分子材料产业创新中心有限公司 | Multi-factor coupling reliability test device |
| CN115825582B (en) * | 2022-11-01 | 2023-11-03 | 深圳技术大学 | Portable microclimate electromagnetic parameter testing device |
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| JP4830938B2 (en) * | 2007-03-23 | 2011-12-07 | 日本軽金属株式会社 | Electronic equipment testing equipment |
| JP5170078B2 (en) * | 2008-06-03 | 2013-03-27 | 日本軽金属株式会社 | Electronic equipment testing equipment |
| CN205374636U (en) * | 2016-02-02 | 2016-07-06 | 航天科工防御技术研究试验中心 | A combined test device for environmental test |
| CN106124911B (en) * | 2016-08-31 | 2019-02-26 | 中国航空综合技术研究所 | A kind of temperature-humidity-electromagnetism integrated environment analog machine |
| CN107864602B (en) * | 2017-10-11 | 2019-04-26 | 北京无线电计量测试研究所 | A kind of reverberation chamber wall-through motor and screen method |
| CN108132390B (en) * | 2017-12-21 | 2020-06-19 | 中国舰船研究设计中心 | Method and system for improving field intensity in reverberation room and simulating composite field electromagnetic environment |
| CN211653013U (en) * | 2019-11-15 | 2020-10-09 | 西安爱邦电磁技术有限责任公司 | High radiation field intensity test system |
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