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–POE checker
Why does the pipeline instrument appear string signal phenomenon in the detection? How to solve it? With the wide application of power cables, the failure rate of power cables is also getting higher and higher. Although the use of the cable fault detector equipment can effectively improve the cable fault, why does the pipeline detector appear string signal phenomenon in the detection? How to solve the cable fault tester manufacturers With the wide application of power cables, the failure rate of power cables is also getting higher and higher. Although the use of cable fault detector equipment can effectively improve the efficiency of cable fault finding.
However, in practical applications, due to the complex cable laying environment, various problems may be encountered that affect the cable fault test work. For example, when many customers use the pipeline instrument to find the live path of the cable, especially when multiple cables are together, the phenomenon of string signal occurs. The reason for the signal of the pipeline instrument string is that the signal applied by the transmitter is shunted to other metal pipelines through the common ground point, or the mutual inductance is coupled to other metal pipelines or metal pipelines.
At this time, it is better to use the direct connection method to apply the signal, or replace the signal application point, change the ground wire, and use a lower frequency (low frequency). Why can the signal be detected on other metal pipelines? This situation is because the signal applied by the transmitter is shunted to other metal pipelines through the common ground point, or the mutual inductance is coupled to other metal pipelines or metal pipelines. At this time, it is better to use the direct connection method to apply the signal, or replace the signal application point, change the ground wire, and use a lower frequency (low frequency).
How to accurately locate the cable path? For the ideal non-interference measured target metal pipeline, the position of the wave peak/valley method is coincident. However, when there are parallel metal pipelines or interference from other metal pipelines, the position of the wave crest/valley method will not coincide. At this time, the real position of the metal pipeline is on the side of the peak value of the wave.
When the interference is serious, the zero value point may not be found, and at this time, the position of the pipeline can only be roughly given according to the peak position. It is best to change the method of applying the signal and re-position the metal pipeline. When the measured positions of the wave peak/valley method do not coincide, the direct reading sounding of metal pipelines will also have a large deviation, and even the depth cannot be read.
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