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–Noyafa Cable Tester
Question: How does the cable identification instrument detect cables Answer: Due to the failure of some cable facilities, it brings a lot of inconvenience to the progress of the work, and the detection methods of some old models of cable identification instruments are too complicated, which is not conducive to the development of on-site work, the following is the problem : How does the cable identification instrument detect the cable Answer: Due to the failure of some cable facilities, it brings a lot of inconvenience to the progress of the work, and the detection methods of some old models of the cable identification instrument are too complicated, which is not conducive to the development of the field work. Introduce the cable identification instrument detection method of our company's improved products. There are two wiring methods: direct connection method and coupling method. The direct connection method is only suitable for the identification of uncharged wires. 1) Coupling method: Connect both ends of the wire to be identified to the ground (through the core wire, shielding or armor) to form a closed loop. When the direction of the output coupling clamp is the same as the direction of the receiving coupling clamp, the wire whose direction of the meter pointer is positively biased is the wire to be identified.
Identification method: Under the condition that the output coupling clamp and the receiving coupling clamp are in the same direction, first determine the phase, take the initial swing of the meter pointer as the criterion, and let the current flow in the direction indicated by the receiving clamp according to the direction shown in the figure. If it is the wire to be identified, the initial swing direction of the meter pointer should be to the right. In the phase judgment process, if there are multiple wires in the same phase, you can compare the amplitude, adjust the sensitivity knob to the appropriate position, and compare the amplitude. The wire with the largest amplitude is the wire to be identified.
2) Direct connection method: The ground wire of the wire to be identified is disconnected, the signal current output wire (red) is connected to any good phase, and the other end of the connected phase is connected to the ground. The signal current return line (black) is connected to the ground. Identification method: First determine the phase, take the initial swing of the meter pointer as the criterion, and let the current flow in the direction indicated by the receiving clamp according to the direction shown in the figure.
If it is the wire to be identified, the initial swing direction of the meter pointer should be to the right. In the phase judgment process, if there are multiple wires in the same phase, you can compare the amplitude, adjust the sensitivity knob to the appropriate position, and compare the amplitude. The wire with the largest amplitude is the wire to be identified. The above is the detection method of the cable identification instrument of our company's products. You can also read the product manual for more information.
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