Method for testing accurate multifrequency and synchronous synergetic conduction sensitivity at high speed

Abstract

The invention discloses a method for testing accurate multifrequency and synchronous synergetic conduction sensitivity at high speed, which comprises the steps: firstly, a testing frequency from 10 kHz to 18 GHz is dispersed according to a frequency step length which conforms to a GJB sensitivity testing requirement to ensure a testing frequency point; the whole testing frequency is grouped from low to high beginning from a starting frequency, and each group has N frequency points; then, an arbitrary waveform generator is controlled to output N frequencies once and switch the frequencies according to group steps; the frequency groups are scanned, if a tested device is sensitive, the frequency group is scanned point to point to determine the sensitive frequency point, and the sensitivity threshold level of the frequency point is determined according to a military standard single-point testing method; the frequencies are switched according to a group stepping mode, each group of frequencies integrally step according to the N delta f step length equivalently, and the next group of multifrequency signals is output until a whole frequency band is scanned completely. The method can synchronously test a plurality of frequently points by scanning once, automatically realize the step scan according to the groups, greatly increase the testing efficiency of the sensitivity test and can quickly diagnose the failures of the sensitive points.

Description

technical field [0001] The invention relates to the field of electromagnetic radiation, in particular to a high-speed testing method for accurate multi-frequency synchronous cooperative conduction sensitivity. Background technique [0002] Any electrical, electronic equipment and subsystems will inevitably feed back electromagnetic energy to the power line when they are working, and at the same time leak and radiate electromagnetic energy from the casing, interconnection lines, antenna feeders, etc. to the space. These intentional and unintentional electromagnetic energies constitute the electromagnetic environment at a certain time and place, and the complex and harsh electromagnetic environment is a potential source of interference for the site equipment. Equipment-level electromagnetic emission and sensitivity measurement is a means to evaluate the EMC level of equipment, and it is also the basis for taking EMI measures. EMC testing can be summarized into 4 categories: r...

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly aims at the problem that the traditional point-by-point step-by-step scanning needs to test each frequency point one by one in the electromagnetic compatibility sensitivity test, resulting in low efficiency, and proposes a high-speed test method for accurate multi-frequency synchronous cooperative conduction sensitivity This method can inject test signals of multiple frequencies into the tested cable at the same time, and improve the test speed under the premise of ensuring the test accuracy

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