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
Author: Noyafa–CCTV Tester
Question: How to find the live cable identification instrument Answer: The cable identification instrument is the main function and function of identifying a certain cable from a bundle of cables. The structure is relatively simple. It consists of a signal generator, a receiving clamp and a signal detector. The question consists of three parts: the search method of the live cable identifier. Answer: The cable identifier is the main function and function of identifying a certain cable from a bundle of cables. The structure is relatively simple. It consists of a signal generator, a receiving clamp and a The signal detector is composed of three parts, which are commonly used equipment in cable erection, migration, maintenance and troubleshooting. The search method of the cable identification instrument is divided into live cable identification instrument and non-electric cable identification instrument according to the conditions of use. Let's talk about each of them. search method. [Searching method of dead cable identification instrument] The search method of dead cable identification instrument is basically the same as that of live identification. The generator feeds periodic unipolar voltage pulses into the cable to be identified, and the cable needs to be grounded at the remote end. In order to ensure that there is enough current flowing through the cable, the direction of the pulse current fed into the cable can be used as an obvious identification criterion, the current flowing out is only through this cable, all other adjacent cables are flowing through Return currents, but they are of opposite polarity, the direction of the current flowing through the cable and its magnitude are detected by the receiver, it has an amplifier and is in series in the circuit, the sensor clamps the cable under test, the current flowing through the cable creates a magnetic field in the sensor A voltage is induced in the coil of the sensor, 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. [Searching method of live cable identification instrument] When the line is live, we cannot affect the normal operation. When identifying the live cable, the induction method is used to measure, and the high-frequency signal is transmitted through the caliper. 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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