A device and method for testing the shielding effectiveness of materials under low-frequency electric field
A technology of shielding effectiveness and low frequency, applied in the field of devices for testing the shielding effectiveness of materials, can solve the problems of complex use, high cost, and inability to use low-frequency electric field shielding effectiveness, etc., and achieve the effect of simple operation and low equipment cost.
Inactive Publication Date: 2017-07-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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Problems solved by technology
Among them, the shielded room method requires a series of measurement equipment, including transmitting antennas, receiving antennas, power amplifiers, etc. These devices are expensive and complicated to use. At the same time, the measurement range of the shielded room method is 10kHz-40GHz, which does not cover 10kHz. The following frequency range
Although the cost of the equipment needed for the flange coaxial method is low, this method is only used for the measurement of shielding effectiveness of 30MHz-1.5GHz, and it cannot be used for the measurement of low-frequency electric field shielding effectiveness.
Method used
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Embodiment 1
[0073] Such as figure 1 Shown is an optional implementation of the above device.
[0074] The size of the cube shielding room 1 is, for example, 0.4m×0.4m×0.4m, and the thickness of the metal material of the shielding room wall is, for example, 0.002m; a square test window 4 with a side length of 0.12m is opened on the left side wall of the shielding room 1 , the emitter plate 3 is located outside the shielding room 1 and parallel to the test window 4, the test plate 5 is located inside the shielding room 1 and parallel to the test window 4, the centers of the emitter plate 3, the test window 4 and the test plate 5 are at the same On a straight line, the distance between the emitter plate 3 and the test window 4 is 0.05m, the distance between the test plate 5 and the test window 4 is 0.05m, the area of the emitter plate 3 and the test window 5 is equal to the test window 4 have the same area. Connect the two test leads of the voltage measuring device 8 to both ends of the ...
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The invention relates to the technical field of electromagnetic shielding, in particular to a method for testing the shielding effectiveness of an electromagnetic shielding material in a low-frequency electric field. The device used in this method is composed of a shielding room, polar plates, AC power supply, resistance, and measuring equipment; the shielding room is made of metal materials, and a test window is opened on one side, and the emitter plate and the test plate are placed in parallel on the outside and inside of the test window. ; A low-frequency AC power supply is applied between the emitter plate and the shield shell to generate an alternating electric field; the test plate and the inner wall of the shield are connected through a large resistance, and the inner plate generates an induced voltage in the alternating electric field, so that the large resistance There is an induced current flowing in the test window, and the shielding effectiveness of the test material in the low-frequency electric field can be calculated by measuring the voltage value at both ends of the large resistance before and after the test window is blocked with the test material.
Description
technical field [0001] The invention relates to the technical field of electromagnetic shielding, in particular to a device and method for testing the shielding effectiveness of materials under a low-frequency electric field. Background technique [0002] Electromagnetic shielding is one of the main technical measures to suppress electromagnetic interference. When the electrical equipment is working, the space electromagnetic field will be induced into the equipment circuit, causing interference to the circuit, which may cause abnormal operation or even permanent damage of the electrical equipment. The role of electromagnetic shielding is to cut off the coupling path of the electromagnetic field, thereby eliminating electromagnetic interference. Among the many means to solve the problem of electromagnetic interference, electromagnetic shielding is one of the most basic and effective technical measures. [0003] At present, the electromagnetic shielding materials used in su...
Claims
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IPC IPC(8): G01R31/00
Inventor 焦重庆史晓宁聂京凯嵇建飞
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)