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 use the live cable identifier? Answer: The wiring method of the live cable identification instrument is divided into the direct connection method and the coupling method: A. The direct connection method is only suitable for the identification of the uncharged cable. B. The coupling method can be used for identification with or without electricity. 2. The problem of the direct connection method: the live cable How to use the identifier? Answer: The wiring method of the live cable identification instrument is divided into direct connection method and coupling method: A. The direct connection method is only suitable for the identification of uncharged cables. B. The coupling method can be used for identification with or without electricity. The ground wire of the cable is disconnected, and the signal current output wire (red clip) of the instrument is connected to any good phase, and the other end of the phase is connected to the ground. The signal current return line (black clip) is grounded. 3. 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.
If it is the cable 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 cables in the same phase, the amplitude can be compared, adjust the receiver sensitivity knob to the appropriate position, and compare the amplitudes. The cable with the largest amplitude is the cable to be identified. 4. Cable identification instrument coupling method: Connect both ends of the cable to be identified to the ground (through core wire, shielding or armor) to form a closed loop.
Adjust the receiver sensitivity knob to an appropriate position, and compare the amplitudes. The largest amplitude is the cable to be identified. 5. The judgment method should be based on the phase judgment, supplemented by the hand swing amplitude. 6. The output red socket (clip) of the mainframe of the identification instrument should be connected to the good phase of the cable to be identified or a phase with a relatively high insulation value, and the terminal of this phase must be grounded reliably.
7. The test is to form a loop through the ground, so the cable must be grounded reliably.
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