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
The pipeline detector basically has the following three types of detection methods: straight and miracles, clamps and induction methods. However, the line detector uses frequency can basically be divided into two categories, that is, high and low frequency. The low frequency segment is slow, the transmission distance is long, the amount of radiation is small, and it is not easy to be connected in series, but the line detector basically has the following three kinds of detection methods: straight and uniform, clamp and induction method.
However, the line detector uses frequency can basically be divided into two categories, that is, high and low frequency. The low frequency segment is slow, the transmission distance is long, the amount of radiation is small, but it is not easy to connect, but the penetration is poor; the high frequency band is high frequency section, strong penetration ability, large radiation, but is fast, and the distance is near. Therefore, in use, the appropriate operating frequency should be selected according to different methods.
First, the straight-up method is to load signals emitted by the transmitter directly on the line to be detected by the pipeline detector. Direct connection is the best signal processing method, which is usually used as priority in cases. With direct connection, signal is stable, and it is not easy to be interfered with other pipelines.
In practice, the cast iron pipeline, steel pipe, etc., it is recommended to use a direct connection method, in which the frequency of use can be selected according to the material of the pipeline, the steel pipe can be low frequencies because the steel pipe is conductive, and the low frequency can be transmitted farther. However, it should be noted that the signal of the direct connection can be transmitted in two-way lines, and the distribution is uneven, the grounding point should have a certain distance from the pipeline (>5M), the grounding needle should be inserted in the soil, and water is watered to reduce the ground resistance, which is conducive to the transmission of the signal. Second, the jaw method can be used when the transmit signal cannot be loaded directly on the pipeline.
The method is to connect the signal of the transmitter with the target line through the clamp. The present invention is suitable for pipelines such as communication, power. Usually use this method, the frequency can be selected according to the external interference.
In the case where the external interference is smaller, the high frequency induction can be used. In general, we can detect about 33 kHz frequently. Be careful when using it, the pliers should be turned off.
Further, although the method is relatively convenient, the transmission distance and the signal stability are different than the direct connection method. Third, the induction method is the name suggests, the induction method is to directly sense the signal of the transmitter to the target line through a non-contact manner. In general, this method can only be employed only if it cannot be used directly and the clamp.
However, this method is greatly affected by the surrounding environment, and a large number of interference occurs when the vehicle passes or the line is close to the metal. So we must pay attention when you select frequencies again, try to avoid high frequency detection, because high frequency excitation ranges, which will cause serious interference between pipeline signals. It should be noted in use, the transmitting end and the receiving end should maintain the distance of 10m as much as possible to avoid the frequency interference signal of the transmitting end.
In terms of the method, generally follow such a rule, you can use it directly without pliers, you can use it without a pliers. SET is also based on specific situations, and select low frequency detection as much as possible. This ensures a more accurate conclusion when the pipeline detector is used.
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