The GH-6600B underground pipeline detector generates electromagnetic waves from the transmitter and transmits the transmitted signals to the underground metal pipelines through different transmission connections. After the underground metal pipelines sense the electromagnetic waves, an induced current is generated on the surface of the underground metal pipelines. It will travel far away along the metal pipeline. During the current propagation, electromagnetic waves will be radiated to the ground through the underground metal pipeline, so that when the pipeline locator receiver is detected on the ground, it will be in the underground metal pipeline. The ground above receives the electromagnetic wave signal, and the GH-6600B underground pipeline detector can determine the position of the underground metal pipeline and the proximal and distal ends of the local pipeline of the GH-6600B underground pipeline detector by receiving the signal strength change. Grounding is good and a loop is formed. At this time, the low frequency is used. If the grounding at both ends is not good, the loop resistance is too large, or the low frequency signal is not coupled, use the intermediate frequency, high frequency or radio frequency to test. The principle of frequency selection is not fixed. The basic principle of frequency selection is given below: For high-impedance pipelines (eg communication cables, pipelines with anti-corrosion coatings and cast iron pipes), high frequency or radio frequency is used. It should be noted that the higher the frequency, the easier the signal is to be sensed on other pipelines and the shorter the signal propagation distance. For general pipeline and cable detection, use intermediate and high frequencies. These frequencies travel farther and do not sense too much signal to other pipelines. The low frequency is suitable for long distance tracking. Low frequency signals travel long distances and do not sense on other pipelines. Low frequency signals are also suitable for long distance and well insulated transmission lines.
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