NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–CCTV Tester
What is the test blind spot of this set of instruments? How to eliminate blind spots? For the tracker host, the test blind area is the width of the transmitted pulse, because when the reflected pulse is reflected within the transmitted pulse width, it is difficult to judge the overlap of the two waveforms. It can be seen how many test blind areas of this set of instruments are? How to eliminate blind spots? For the tracker host, test“blind spot”is the width of the transmitted pulse, because when the reflected pulse is reflected within the transmitted pulse width, it is difficult to judge the overlap of the two waveforms. It can be seen that the reflected wave is“blind spot”In the internal reflection, the two waveforms overlap to a waveform to become wider, and the inflection point of the reflected wave cannot be judged, resulting in a test.“blind spot”.
Host test of this set of instruments“blind spot”About 20 meters (according to the transmitted pulse width and the propagation speed of the radio waves). eliminate“blind spot”There are two basic methods: (1) Change the measurement end point to the test point, which eliminates the test where the fault point is very close to the test point.“blind spot”. (2) Compare the test waveform reflected by the fault in the transmitted pulse width with the normal waveform, and judge the inflection point of the reflected wave through comparison.
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