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Method of testing isolation between wire cables by adopting harmonic waves

A cable and harmonic technology, applied in the field of isolation detection between cables, can solve the problems of long time and slow speed, shortening the isolation test time, etc.

Active Publication Date: 2013-10-09
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The present invention aims at the problem that in the current process of testing the isolation between cables, only the frequency response of one frequency point can be tested at a time, and when testing the broadband response between cables, it is necessary to scan the entire frequency band at a single frequency point, which takes a long time and slow speed , proposed a method of using harmonics to test the isolation between cables, using the characteristics that harmonic signals are distributed in a wide frequency spectrum and the coupling between cables is a linear system response, while testing the isolation between cables Multiple frequencies to improve test speed, test the frequency response in the entire frequency range at the same time, shorten the test time of isolation

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  • Method of testing isolation between wire cables by adopting harmonic waves

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Embodiment Construction

[0020] figure 1 This is the flow chart of this invention, and the implementation process of this method will be described in detail below in conjunction with examples. In this embodiment, the required test frequency range is 40-120 MHz, and the frequency resolution is 20 MHz.

[0021] Step 1: Determine the harmonic fundamental frequency and harmonic order. According to the test frequency range f a -f b and frequency spacing accuracy f i The demand for selecting the harmonic signal frequency, the frequency interval f between each harmonic frequency c Should be less than or equal to the test frequency resolution f i , the minimum harmonic frequency of the harmonic signal should be less than or equal to the lower limit f of the frequency range a , the maximum harmonic frequency should be greater than or equal to the upper limit f of the test frequency range b , the lowest harmonic order m×f of the injected signal c ≤f a , the highest harmonic order n×f of the injected sig...

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Abstract

The invention relates to the field of electromagnetic compatibility detection, and provides a method of testing isolation between wire cables by adopting harmonic waves. The method comprises the following steps: 1. according to the requirements of a testing frequency range fa-fb and a frequency separation accuracy fi, determining the fundamental frequency of the harmonic waves and the harmonic order; 2. generating harmonic signals and injecting the harmonic signals into interfering wire cables; 3. testing the intensity of each order of the harmonic waves of the interfering wire cables and theinterfered wire cables; and 4. computing the isolation between the wire cables on each harmonic frequency point. The method can simultaneously complete the detection of the electromagnetic compatibility isolation on a wider bandwidth by injecting a group of harmonic waves once, thereby greatly improving the testing efficiency.

Description

technical field [0001] The invention relates to the technical field of electromagnetic compatibility detection, in particular to the field of detection methods for isolation between cables. Background technique [0002] With the complexity and diversification of cables used in electronic systems, the coupling relationship between cables is becoming more and more complicated, and the difficulty of electromagnetic compatibility analysis is becoming more and more difficult. Especially as the frequency of the transmission signal in the cable continues to increase and the occupied bandwidth continues to expand, the radiation generated by the cable in the form of an antenna interferes with other sensitive cables and becomes an important source of electromagnetic compatibility problems. [0003] At present, when testing the electromagnetic coupling response between cables, the frequency-by-frequency point test method is adopted: under the condition of meeting the requirements of th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R23/00
Inventor 谢树果陈文青孙伟苏东林王龙峰
Owner BEIHANG UNIV