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–Cable Tester Suppliers
Because the running live cable is not allowed to damage any connecting wires such as grounding wire, it is also not allowed to directly add the output signal of the live cable identifier transmitter to the phase line of the cable with high voltage. There are two problems to be solved in the identification of live cables, one is how the cable identification signal is coupled to the cable; the other is that the coupled signal is generally small, and the running cable may have 50Hz unbalanced current and induced 50Hz interference current. The 50Hz power frequency electromagnetic interference caused by the distributed capacitance current and other components, the high sensitivity receiving caliper has the problem of how to resist the 50Hz power frequency interference. The live cable identification instrument developed by us adopts single chip encoding and decoding technology for transmission and reception and PSK technology which is widely used in the field of communication.
A phase-encoded signal with an average value of 0 is transmitted on the transmitting caliper, and the single-chip microcomputer in the receiving caliper filters the received signal by hardware and software, and then performs phase identification. When the receiving caliper clamps the cable according to the current direction, it is recognized. The cable ammeter is shifted 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 intensity on the identified cable is the same across the board, the electromagnetic signal strength received by the receiving caliper along the cable is consistent. In principle, the identified cable is not limited by the length of the identified cable.
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