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Method for testing shielding effectiveness of cable shielding layer

A technology of cable shielding layer and shielding effectiveness, which is applied in the direction of measuring electricity, measuring devices, and measuring electrical variables, etc., which can solve the problems of narrow frequency band, easy to be affected by the environment, and low test accuracy of cable shielding layer shielding effectiveness. It is easy to implement , the effect of wide test frequency band and low cost

Inactive Publication Date: 2015-03-04
JIANGXI HONGDU AVIATION IND GRP
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AI Technical Summary

Problems solved by technology

[0007] In order to solve the existing problems such as narrow frequency band, long test time, low test accuracy, and easy to be affected by the environment for the existing cable shielding layer shielding effectiveness test, the purpose of the present invention is to propose a test method for cable shielding layer shielding effectiveness

Method used

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  • Method for testing shielding effectiveness of cable shielding layer

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Embodiment Construction

[0016] Attached below figure 1 The present invention is described in detail:

[0017] A test method for the shielding effectiveness of a cable shielding layer. The test device is placed in a shielding room, and the equipment under test of the unshielded cable and the shielded cable is connected to the test device, and the antenna is used to receive the radiated electric field of the equipment under test. The distance of the cable is 1m;

[0018] The test frequency band of this test system is 2MHz ~ 18GHz; finally, the radiated electric field value received by the antenna is input into the computer through the measuring receiver for storage and processing.

[0019] Build a test system in a shielded dark room with a signal source, a measuring receiver, an antenna and a 50Ω load, and measure the radiated electric field value E of unshielded cables and shielded cables respectively 1 (dB), E 2 (dB), so that the shielding effectiveness of the shielded cable layer is: SE=E 1 ...

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Abstract

The invention discloses a method for testing shielding effectiveness of a cable shielding layer. The method is characterized in that a testing device is placed into a shielded room, a tested device of an unshielded cable and a shielded cable are connected on the testing device, the radiated electric field of the tested device is received by an antenna, the distance between the antenna and a cable to be tested ranges from 0.8m to 1.5m, the testing frequency of a testing system is 2MHz-18GHz, a radiated electric field value received by the antenna is finally inputted to a computer through a measuring receiver, stored and processed. The method has the advantages of wide testing frequency, high efficiency, low cost, high accuracy, easiness in implementation, convenience in measurement and the like.

Description

technical field [0001] The invention relates to a method for testing the shielding effectiveness of a cable shielding layer, which belongs to radio frequency testing [0002] technology field. Background technique [0003] At present, there are three methods for testing multi-bundle multi-core cables: [0004] 1. The disadvantage of the power absorbing clamp method is that this method is an open test method, which will be affected by the surrounding electromagnetic environment, and the test frequency is limited by the working frequency of the power absorbing clamp, and the test frequency band is relatively narrow; [0005] 2. The mixing chamber method, place the cables whose two ends are respectively connected to the matching load and the signal receiver or spectrum analyzer in the mixing chamber, and place the receiving antenna. Input a specific power into the mixing chamber through the transmitting antenna, measure the signal power received by the cable and the signal po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 顾问李严余奎吴春艳王春华黄利花余玉香张曼孙瑞宿正昊鲍志琴
Owner JIANGXI HONGDU AVIATION IND GRP
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