Author: Noyafa–CCTV Tester
How to find the live and uncharged cable identifier? The cable identification instrument is the main function and function for identifying a certain cable from a bundle of cables. The structure is relatively simple. How should I find it? The cable identification instrument is the main function and function for identifying a certain cable from a bundle of cables. The structure is relatively simple. It consists of three parts: a signal generator, a receiving clamp and a signal detector. Commonly used equipment in maintenance and troubleshooting, the search methods of cable identification instruments are divided into live cable identification instruments and non-electric cable identification instruments according to the conditions of use. Let's talk about their respective search methods. The search method of the dead cable identification instrument is basically the same as that of the live identification instrument. The generator feeds periodic unipolar voltage pulses into the cable to be identified, and the cable needs to be grounded at the remote end to ensure Sufficient current flows through the cable, the direction of the pulse current fed into the cable can be used as a clear identification criterion, the outgoing current only passes through this cable, and all other adjacent cables flow through the return current , but they have opposite polarities, the direction of the current flowing through the cable and its magnitude are detected by the receiver, it has an amplifier and is connected in series in the circuit, the sensor clamps the cable under test, the magnetic field generated by the current flowing through the cable is in the coil of the sensor A voltage is induced in the cable, and the polarity of the voltage is determined by the current direction and the direction of the sensor coil, so as to achieve the identification function of the cable. The search method of the live cable identification instrument, when the line is live, we cannot affect the normal operation. When identifying the live cable, the inductive method is used to measure, transmit high-frequency signals through the caliper, and the receiver receives the signal characteristics through the software and hardware. Filtering, during phase identification, when the receiving caliper clamps the cable according to the current direction, the current meter of the identified cable is deviated to the right, accompanied by sound and light indication.
The current direction of other cables is opposite to the current direction of the identified cable, and the pointer of the ammeter is shifted to the left. There is no sound and light indication. This reflects the uniqueness of the identified target cable.
It is easy to distinguish the identified cable from multiple cables. Since the signal current strength on the identified cable is the same across the board, the electromagnetic signal strength received by the receiving caliper along the cable is the same. The cable is not limited by the length of the identified cable.
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