CN112763824A - Comprehensive test box and test method - Google Patents
Comprehensive test box and test method Download PDFInfo
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- CN112763824A CN112763824A CN202011553390.7A CN202011553390A CN112763824A CN 112763824 A CN112763824 A CN 112763824A CN 202011553390 A CN202011553390 A CN 202011553390A CN 112763824 A CN112763824 A CN 112763824A
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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 the electromagnetic environment and the natural environment of a product in actual work cannot be simulated simultaneously in the prior art. 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 positioned 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 a comprehensive test method for loading the electromagnetic environment and the natural environment in one test box simultaneously, meets the environmental adaptability test requirements of the product under the comprehensive action of different environmental factors, simultaneously simulates the electromagnetic environment and the natural environment which are born by the product during actual work, and can fully verify the real environmental 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 of environmental factors generally amplifies the effect of a single factor. A large number of equipment reliability tests can show that equipment which has not failed in higher order functional vibration and temperature cycling tests fails in a comprehensive reliability environment test. Generally, a circuit board of an electronic device is mounted in a casing and is finally placed on an internal support structure in a square or rectangular box shape. To facilitate disassembly for servicing, the seal is generally no longer made. Due to environmental changes or vibration shadows during use, electronic device housing gaps can change. When the slot length reaches 1/2 wavelengths or an integer multiple of 1/2 wavelengths, the slot becomes a very effective radiating antenna, causing leakage of electromagnetic energy, resulting in poor electromagnetic compatibility of internal electronic equipment. For interconnecting cables of equipment, the environmental effects of high temperature on the cable appear as: resulting in discoloration, cracking or cracking of the cable and poor electrical properties. The environmental effect of low temperature on the cable is mainly represented by: resulting in brittleness and poor impact resistance of the cable. The change of temperature and humidity can cause the cable to have various environmental effects, such as chemical aging, cable expansion due to moisture absorption, internal stress change, electrical property fluctuation and the like.
The following problems are evident from the review of various standards relating to electromagnetic compatibility tests and natural environment tests, as well as the known technical literature: firstly, the radiation sensitivity assessment of the electromagnetic environment can only be carried out at normal temperature, and the influence assessment of natural environment factors such as high temperature, low temperature, damp heat and the like on the product is lacked; and secondly, when a natural environment test is carried out, the radiation sensitivity test of an electromagnetic environment is lacked. Because the influence of electromagnetic environment and natural environment on the product in actual work can not be simulated at the same time, the adaptability verification of the real environment of the product is not sufficient.
In order to solve the problems, the invention provides a comprehensive test box and a test method, which realize a test method for simultaneously loading an electromagnetic environment and a natural environment in the same test box by building an electromagnetic reverberant room test environment, and evaluate the environmental adaptability of a product under the comprehensive action of different environmental factors. Compared with the existing electromagnetic environment test and natural environment test, the invention has the characteristics of simultaneously testing by integrating different types of environmental factors, can better simulate the real environment of the product and has more sufficient examination.
Disclosure of Invention
In view of the above analysis, the embodiments of the present invention provide a comprehensive test chamber and a test method, so as to solve the problem in the prior art that the electromagnetic environment and the natural environment of the product during actual work cannot be simulated at the same time.
In one aspect, the invention provides a comprehensive test box, which 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 positioned on a second side wall of the comprehensive test box, and the first side wall is perpendicular to the second side wall.
Furthermore, a shielding rubber strip is arranged on the test box door and used for ensuring the 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 plating materials.
Furthermore, the comprehensive test box also comprises a galvanized steel plate, and the galvanized steel plate is arranged on the inner wall of the comprehensive test box.
Furthermore, the comprehensive test box also 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.
Furthermore, the stirrer comprises a stirring shaft of the stirrer of the reverberation chamber, a stirrer blade and a stirrer motor, wherein the stirrer blade is fixed on the stirring shaft of the stirrer of the reverberation chamber, and the stirrer motor drives the stirring shaft of the stirrer of the reverberation chamber to rotate at a constant speed.
Furthermore, a test box observation window is arranged on a third side wall of the comprehensive test box, and the third side wall is perpendicular to the second side wall.
Furthermore, the glass of the observation window of the test chamber is shielding glass, so that the leakage of electromagnetic signals in the test chamber can be avoided.
On the other hand, the invention provides a test method of a comprehensive test box, which adopts the comprehensive test box and comprises the following steps:
step 1: assembling a test box;
step 2: carrying out comprehensive test;
and step 3: and (4) carrying out control analysis.
Furthermore, the comprehensive test box also comprises a natural environment test box compressor unit, wherein the natural environment test box compressor unit is positioned on the other side of the air inlet and the air outlet and is opposite to the stirrer.
Furthermore, the comprehensive test box also comprises a ventilation cut-off waveguide, and the ventilation cut-off waveguide is arranged on the air inlet and the air outlet.
Furthermore, the ventilation cut-off waveguide is made of low-carbon steel materials, and the surface of the ventilation cut-off waveguide is galvanized.
Compared with the prior art, the invention can realize at least one of the following beneficial effects:
1. according to the invention, the hollow high-temperature and low-temperature resistant shielding rubber strip is used, the deformation amount of the shielding rubber strip is increased due to the hollow design, the shielding rubber strip can be better attached to the test box door, and the electromagnetic shielding efficiency 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 plate 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 waveguides are 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 plating materials, and the comprehensive test box is effectively suitable for high-temperature, low-temperature and damp-heat environments in the test box.
5. The observation window of the comprehensive test box uses shielding glass, so that the leakage of electromagnetic signals is effectively avoided.
6. The invention realizes a comprehensive test method for loading the electromagnetic environment and the natural environment in one test box simultaneously by a step stirring mode reverberation chamber method, meets the environmental adaptability test requirements of products under the comprehensive action of different environmental factors, simultaneously simulates the electromagnetic environment and the natural environment stressed by the products during actual work, and can fully verify the real environmental adaptability of the products.
In the invention, the technical schemes can be combined with each other 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 will 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, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a schematic view of a box body of a comprehensive test chamber;
FIG. 2 is a front view of a vent stop waveguide;
FIG. 3 is a side view of a vent stop waveguide;
fig. 4 is a sectional view of the shield rubber strip.
Reference numerals:
1-a mixer shaft of a reverberation chamber; 2-a stirrer blade; 3-a stirrer motor; 4-a transmitting antenna; 5-a receiving antenna; 6-a power amplifier; 7-a signal source; 8-a measurement receiver; 9-a shielding rubber strip; 10-test chamber door; 11-natural environment test chamber compressor set; 12-a vent stop waveguide; 13-galvanized steel sheet.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the term "connected" is to be understood broadly, and may be, for example, fixed, detachable, or integrally connected, and may be mechanically or electrically connected, and may be directly or indirectly connected through an intermediate medium, unless otherwise specifically stated or limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The terms "top," "bottom," "above … …," "below," and "on … …" as used throughout the description are relative positions with respect to 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 multifunctional, regardless of their orientation in space.
Example 1
In an embodiment of the present invention, a comprehensive test chamber and a test method are disclosed, as shown in fig. 1 to 4, the comprehensive test chamber includes a stirrer, a transmitting antenna 4, a receiving antenna 5, a power amplifier 6, a signal source 7, a measurement receiver 8, a shielding rubber strip 9, a test chamber door 10, a natural environment test chamber compressor unit 11, a ventilation cut-off waveguide 12, and a galvanized steel plate 13. The natural environment test box compressor unit 11 is located at one end of the outer side of an air inlet and an air outlet of the test box, the stirrer is located on the inner side of the air inlet and the air outlet of the test box, the ventilation stop waveguide 12 is installed on the air inlet and the air outlet, the transmitting antenna 4 and the receiving antenna 5 are installed on the first side wall of the test box, and the test box door 10 is located on the second side wall of the test box, wherein the first side wall and the second side wall are in a vertical relation.
It should be noted that the compressor unit of the natural environment test chamber outputs cold air and hot air, the cold air and the hot air are blown in or blown out of a circulation channel of the comprehensive test chamber through the air inlet and the air outlet, set natural environment test conditions are finally achieved through multiple air circulations, and the ventilation stop waveguide is arranged at the air inlet and the air outlet, so that the leakage of electromagnetic energy is prevented, the integral electromagnetic shielding efficiency of the test chamber is ensured, and the uniformity of the electromagnetic environment of the test chamber is ensured.
Preferably, the ventilation cut-off waveguide 12 of the integrated test chamber is made of low-carbon steel, and the surface of the ventilation cut-off waveguide is galvanized to obtain high conductivity.
The stirrer is installed on one side of the air inlet and the air outlet, is opposite to the natural environment test box compressor unit 11 and comprises a reverberation chamber stirrer stirring shaft 1, stirrer blades 2 and a stirrer motor 3, wherein the stirrer blades 2 are fixed on the reverberation chamber stirrer stirring shaft 1, the stirrer motor 3 drives the reverberation chamber stirrer stirring shaft 1 to rotate at a constant speed, the stirrer blades 2 on the reverberation chamber stirrer stirring shaft 1 reflect electromagnetic waves in the comprehensive test box to generate an electromagnetic field with uniform statistics, and particularly, the reverberation chamber stirrer stirring shaft 1 is horizontally installed on one side close to the air inlet and the air outlet.
It should be noted that, the stirrer reflects the electromagnetic wave emitted from the transmitting antenna into the comprehensive test box uniformly into the comprehensive test box to excite different modes of the electromagnetic wave in the comprehensive test box, and changes the standing wave pattern inside the comprehensive test box to generate a statistically uniform electromagnetic field, and the electromagnetic environment field intensity in the comprehensive test box is stronger under the condition of specific power input.
An electromagnetic signal generated by the signal source 7 is amplified by the power amplifier 6 and is transmitted to the comprehensive test box through the transmitting antenna 4. The receiving antenna 5 is used for measuring the electromagnetic environment of the position where the receiving antenna 5 is located, and transmitting the measuring signal to the measuring receiver 8, and the receiver 8 displays the measuring field intensity.
Preferably, the transmitting antenna 4 and the receiving antenna 5 in the comprehensive test box are plated with alloy steel surfaces to adapt to high-low temperature, damp and hot environments in the comprehensive test box.
The shielding rubber strip 9 is adhered to the test chamber door 10. The stainless steel inner wall of the box body of the comprehensive test box is additionally provided with a galvanized steel plate 13. And a test box observation window is arranged on the third side wall of the comprehensive test box, the third side wall and the second side wall are in a vertical relation, and shielding glass is used for the observation window of the comprehensive test box, so that the leakage of electromagnetic signals is avoided.
Preferably, the shielding rubber strip 9 is designed to be a hollow structure so as to increase the deformation of the shielding rubber strip 9, better adhere to the test box door 10 and ensure the electromagnetic shielding effectiveness of the test box door 10.
It should be noted that, the shielding rubber strip is installed on the test box door, so that the air tightness of the comprehensive test box is increased, and in addition, the shielding rubber strip improves the electromagnetic shielding efficiency of the test box door and prevents the leakage of electromagnetic energy.
Compared with the prior art, the invention realizes the comprehensive test method for simultaneously loading the electromagnetic environment and the natural environment in the same test box by the step stirring mode reverberation chamber method, and meets the environmental adaptability test requirements of products under the comprehensive action of different environmental factors. According to the invention, the hollow high-temperature and low-temperature resistant shielding rubber strip is used, the deformation amount of the shielding rubber strip is increased due to the hollow design, the shielding rubber strip can be better attached to the test box door, and the electromagnetic shielding efficiency 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 plate 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 actual work in a test box, and can fully verify the real environment adaptability of the product.
Example 2
The invention also discloses a test method of the comprehensive test box, which comprises the following steps:
step 1: assembling a test box;
a shielding rubber strip 9 is adhered to 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 cut-off waveguide 12 is arranged at an air inlet and an air outlet of the comprehensive test box, and a stirrer is horizontally arranged at a central height position close to the inner wall of an air inlet and an air outlet of the comprehensive test box.
Step 2: carrying out comprehensive test;
and (4) verifying the electromagnetic reverberation room according to the requirement of GJB151B-2013 appendix D. Performing an electromagnetic environment radiation sensitivity test in a normal temperature state according to the requirements of GJB 151B-2013; carrying out a low-temperature test according to the low-temperature test conditions specified by the outline; after the temperature is balanced, carrying out a product performance test and an electromagnetic environment radiation sensitivity test under a low-temperature condition; carrying out high-temperature test according to the high-temperature test conditions specified by the outline; after the temperature is balanced, a product performance test and an electromagnetic environment radiation sensitivity test under a high-temperature condition are carried out.
And step 3: and (4) carrying out control analysis.
And (3) integrating the test results in the step (2) to perform comparison analysis for use in various stages of product development test, acceptance test, production test and the like.
Illustratively, the test method of the combined test chamber comprises the following steps:
step 1: assembling a test box;
a shielding rubber strip 9 is adhered to 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 cut-off waveguide 12 is arranged at an air inlet and an air outlet of the comprehensive test box, and a stirrer is horizontally arranged at a central height position close to the inner wall of an air inlet and an air outlet of the comprehensive test box.
Step 2: carrying out comprehensive test;
step 201: performing electromagnetic environment field uniformity calibration test under a normal temperature environment to obtain a field uniformity area 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 square waves with 1kHz and 50% duty ratio;
step 204: calculating the injection forward power required for reaching the expected field strength by using the expected test field strength and the field strength difference obtained in the verification, injecting peak forward power equal to the calculated value into the comprehensive test box, and using an interpolation value between calibration points;
step 205: adjusting the measuring receiver 8 or the sensor display device, displaying the signals measured by the receiving antenna 4 or the sensor, and confirming the existence of the electric field;
step 206: scanning within a test frequency range according to the requirements of GJB151B-2013, completing electromagnetic environment tests of all frequency bands, and monitoring whether a tested product is sensitive. If the tested product is sensitive, determining a sensitivity threshold level according to the 4.3.11.5.4 of GJB 151B-2013;
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 environmental temperature reaches the stable temperature, repeating the steps 202 to 206, scanning in the testing frequency range according to the requirements of GJB151B-2013, completing the electromagnetic environment test of all frequency bands, and monitoring whether the tested product is sensitive;
step 209: sequentially loading other natural environment test conditions specified by the test outline, repeating the step 202 to the step 206 after the environment temperature reaches a stable state, scanning in the test frequency range according to the requirements of GJB151B-2013, completing the electromagnetic environment test of all frequency bands, and monitoring whether the tested product is sensitive.
And step 3: and (4) carrying out control analysis.
And (3) integrating the test results in the step (2) to perform comparison analysis for use in various stages of product development test, acceptance test, production test and the like.
Compared with the prior art, the comprehensive test method for the electromagnetic environment and the natural environment overcomes the limitation that electromagnetic environment and natural environment factors cannot be simultaneously applied to a tested product, realizes the test method under the combined action of multiple environmental factors, and provides important guiding significance for guiding and verifying the environmental adaptability work of the product under the coupling action of multiple environmental factors.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. The comprehensive test box is characterized by comprising a transmitting antenna (4), a receiving antenna (5) and a test box door (10), wherein the transmitting antenna (4) and the receiving antenna (5) are installed on a first side wall of the comprehensive test box, the test box door (10) is located on a second side wall of the comprehensive test box, and the first side wall is perpendicular to the second side wall.
2. A comprehensive test chamber as claimed in claim 1, wherein a shielding rubber strip (9) is arranged on the test chamber door (10), and the shielding rubber strip (9) is used for ensuring the electromagnetic shielding effectiveness of the test chamber door (10).
3. A combined test chamber as claimed in claim 2, characterized in that the shielding rubber strip (9) is of hollow structure.
4. A test chamber as in claim 1, characterized in that the transmitting antenna (4) and the receiving antenna (5) are both made of alloy steel surface plated material.
5. The integrated test chamber of claim 1, further comprising a galvanized steel sheet (13), wherein the galvanized steel sheet (13) is disposed on an inner wall of the integrated test chamber.
6. The integrated test chamber of claim 1, further comprising an agitator, an air inlet and an air outlet, the air inlet and the air outlet being located on one side of the agitator.
7. The comprehensive test box according to claim 6, wherein the stirrer comprises a reverberation chamber stirrer stirring shaft (1), a stirrer blade (2) and a stirrer motor (3), the stirrer blade (2) is fixed on the reverberation chamber stirrer stirring shaft (1), and the stirrer motor (3) drives the reverberation chamber stirrer stirring shaft (1) to rotate at a constant speed.
8. A combined test chamber as claimed in claim 1, wherein a third side wall of the combined test chamber is provided with a test chamber observation window, and the third side wall is perpendicular to the second side wall.
9. A combined test chamber as claimed in claim 8, wherein the glass of the test chamber observation window is shielding glass to prevent leakage of electromagnetic signals within the combined test chamber.
10. A method of testing an integrated test chamber, using the integrated test chamber of any one of claims 1 to 9, comprising the steps of:
step 1: assembling a test box;
step 2: carrying out comprehensive test;
and step 3: and (4) carrying out control analysis.
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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 |
| CN115825582A (en) * | 2022-11-01 | 2023-03-21 | 深圳技术大学 | Portable microclimate electromagnetic parameter testing device |
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| CN112763824B (en) | 2023-07-14 |
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