Multi-core cable sequence measuring method based on frequency modulation digital code and apparatus thereof

Abstract

The invention relates to a polycore cable sequencing method based on digital frequency-modulation encoding and a device thereof. The device consists of a transmitter and a receiver, which are connected with the two ends of a polycore cable to be detected; during measurement, the transmitter designs digital encoded signals for each cable to be detected and sends the encoded signals to the cable to be detected after frequency modulation; a receiving end connects any two cables by a measuring probe, the received signals of the two cables obtain effective received signals of the cable marked as 'plus' end through a difference circuit; the effective received signals are modulated, thus obtaining the sequence numbers of connected cables and displaying the result. The measuring device adopting the measuring method of the invention has quite small volume is convenient for being used on site. No public reference lines are needed to during measurement, In addition, the adoption of the measuring method of the invention ensures higher reliability of the measurement and long-distance test.

Description

technical field [0001] The invention relates to a technique for sequencing and marking long-distance multi-core cables. Background technique [0002] With the development of global informatization, as an important transmission medium of informatization, the application of cables has penetrated into all fields of society and is playing an increasingly important role in national economic construction. During the cable laying process, how to identify the intricate and complex cables at both ends of the long-distance cable laying has become a difficult problem in construction. Although multi-core cables can be distinguished by color codes, if there is more than one multi-core cable at the node, it is still difficult to effectively distinguish them, and in many occasions (such as power cables) there is no color code to distinguish cables. On the other hand, when a cable fails due to factors such as the surrounding environment, external force, rodent damage, corrosion, and aging,...

AI Technical Summary

Problems solved by technology

Among these methods, some require a common reference ground wire at both ends of the tested cable, and some use unmodulated voltage or current signals for measurement. When the cable distance is long and the signal loss is serious, the measurement will fail.

At present, there are no patents or products using FM digital coding technology for long-distance cable sequencing

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