Three-degree-of-freedom electromagnetic interference automatic test device and method

Abstract

The invention provides a three-degree-of-freedom electromagnetic interference automatic test device and a three-degree-of-freedom electromagnetic interference automatic test method. The device comprises a three-degree-of-freedom platform, a computer and a data acquisition and processing unit. The method comprises the following steps: establishing a three-degree-of-freedom supporting platform; fixing an electromagnetic interference test instrument on an X-axis supporting rod; connecting a PX1 data acquisition card with the electromagnetic interference test instrument; connecting a PCI-7344 control card with a motor control unit; setting the limit positions of the X axis, the Y axis and the Z axis; after the test starts, powering on and preheating the tested equipment; initializing the three-degree-of-freedom test device; changing the position of the electromagnetic interference test instrument according to the sequence of the X axis, the Y axis and the Z axis; transmitting the test data of the electromagnetic interference test instrument to the PX1 data acquisition card through a PXI bus; and transmitting the test result to a frequency spectrum analysis unit of the computer. Due to the device and the method, three motors are controlled by LabVIEW software, so that automation of the electromagnetic interference test is realized, the test time and the test cost are saved, and the test accuracy is improved.

Description

technical field [0001] The invention relates to the field of electronic product testing, in particular to a three-degree-of-freedom electromagnetic interference automatic testing device and method. Background technique [0002] EMC (Electromagnetic Compatibility, EleetroMagnetic capability) refers to the ability of electronic equipment and systems to coordinate and work effectively in various electromagnetic environments. Electromagnetic interference is the phenomenon of electromagnetic changes that are detrimental to the performance of electronic equipment. Electromagnetic interference not only affects the normal operation of electronic equipment, but even causes damage to some components in electronic equipment. Therefore, sufficient attention should be paid to the electromagnetic interference generated by electronic equipment. It is necessary to pay attention to the fact that electronic equipment can work normally without being disturbed by the surrounding electromagnet...

AI Technical Summary

Problems solved by technology

[0004] Electromagnetic interference test is one of the test items of electromagnetic compatibility test. In this test item, if the main source of electromagnetic interference cannot be found, no matter how much energy is invested in the secondary interference source, it is almost useless.

Therefore, the location of the electromagnetic interference source is the most energy-consuming and difficult problem in most electromagnetic interference tests

[0005] In the prior art, the test for electromagnetic interference is basically limited to testing with a spectrum analyzer in a two-dimensional plane, which cannot reflect the real electromagnetic compatibility status of the measured object in three-dimensional space, and the price is very expensive

However, cheap and low-end spectrum analyzers cannot meet the test accuracy and requirements

And the current electromagnetic interference test is basically a manual test. On the one hand, frequent manual operations reduce work efficiency, and on the other hand, the test is uncertain.

[0006] In addition, because the intensity of electromagnetic interference decays rapidly with the increase of distance, the electromagnetic interference received in different spaces is different, and the existing technology cannot test the relationship between electromagnetic interference and distance in three-dimensional space

Images