Cable checking circuit structure and common-line-free cable checking method

Abstract

The invention discloses a cable checking circuit structure and a common-line-free cable checking method. Only tested cables without any common reference end are needed for a circuit crossing a checking signal sending end and a checking signal receiving end, each tested cable checking circuit comprises a current-limiting resistor, a tested cable, an isolation diode and a signal coupler of the checking signal receiving end, and the tested cable, the isolation diode and the checking signal receiving end are sequentially connected from a checking signal sending end equipment port. Cathodes of the isolation diodes are connected with anodes of input ends of the signal couplers, cathodes of input ends of the signal couplers are connected with anodes of the isolation diodes, and the cathode ends of the isolation diodes of the tested cable checking circuits or anode ends of input ends of the signal couplers of the tested cable checking circuits are connected through wires. Unique signals attached to the cables are sent to the corresponding cables respectively and sequentially by the sending end, and serial numbers of the cables are displayed after the signals are received by the receiving end. By means of the method, long-distance cable checking can be quickly and accurately carried out by one person without common lines.

Description

technical field [0001] The invention relates to a multi-core cable long-distance calibration technology, in particular to a cable calibration circuit structure and a cable calibration method without a common line. Background technique [0002] In power lighting or intelligent system wiring projects, a large number of multi-core cables will be used as the signal transmission medium between various on-site control instruments, equipment and the control system of the central control room. In the test, it is especially necessary to confirm whether the cable numbers corresponding to each core wire correspond to both ends, so as to ensure that the various signals and power cables of the instrument are connected correctly, which is called the calibration process. [0003] The traditional calibration method requires two skilled technicians who have a clear understanding of the drawings and a tacit understanding, use walkie-talkies and multimeters, use shielded wires and other common...

AI Technical Summary

Problems solved by technology

[0004] However, in actual work, it is found that due to the different technical proficiency of the personnel, errors or errors will inevitably be caused when using the walkie-talkie for voice communication in a noisy environment. Wrong wiring causes the instrument to burn out from time to time, and finding and correcting the wrong wiring will waste a lot of man-hours, which will affect the smooth progress of the entire project

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