Equipment for filtering interference in communication line in electromagnetic compatibility test

Abstract

The invention discloses equipment for filtering interference in a communication line in an electromagnetic compatibility test, and belongs to the field of electromagnetic compatibility test detection. The equipment is composed of an input system and an output system which are symmetrical, the two systems are connected through an optical fiber connected with a photoelectric switch, the input system adopts a metal frame and is grounded, and an output system shell adopts an insulating material and is suspended. According to the invention, through a plurality of anti-electromagnetic compatibility conducted interference means, electromagnetic interference which is disturbed to a communication line in a test process is filtered and completely isolated, the safe operation of a computer and the network communication efficiency in an electromagnetic compatibility test environment are effectively ensured, and a reliable communication basis is provided for a final electromagnetic compatibility test result.

Description

Technical field[0001]The present invention belongs to the field of electromagnetic compatibility test, and more particularly to apparatus for filtering electromagnetic interference on monitoring communication lines in a test environment.Background technique[0002]The power equipment needs to meet the electromagnetic compatible immunity test requirements according to the standard requirements. In the test, the computer communicates with the test sample through the network cable, and interferes with test samples or communication lines to verify the operation of testing samples in interference environments. .[0003]During the application of interference on the samples itself, interference often crosstalk into the Ethernet communication line by test samples, computer secondary devices operating in Ethernet monitoring equipment will be interfered, if the computer cannot resist interference, the communication error can cause communication errors. Impact the experimental results; it may also...

AI Technical Summary

Problems solved by technology

[0003] In the process of applying interference to the tested sample itself, the interference often crosstalks to the Ethernet communication line through the tested sample, and the computer auxiliary equipment that uses Ethernet to monitor the operating status of the equipment will be interfered. If the computer cannot resist the interference, it will cause communication errors. , affecting the experimental results; it may also cause communication interruption, test data cannot be read, etc. In severe cases, the computer will be damaged

[0004] At present, most of the methods to solve the above problems are to wind the magnetic ring on the Ethernet line, filter out the interference through the magnetic ring, and reduce the interference to the computer, but the performance is not good in the actual application process. First, the magnetic ring can only filter out part of the interference. The interference to the computer cannot be completely isolated; secondly, because the network cable is long or short in application, and the number of turns around the magnetic ring is inconsistent, the anti-interference performance varies greatly

[0005] Chinese patent application 201610830271.9 discloses an anti-interference device for electric energy meter testing. The solution is to set up a decoupling circuit on the power line without involving communication lines.

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