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
How does the cable fault tester find the cable direction and estimate the cable burial depth? How does the cable fault tester find the cable direction and estimate the cable burial depth? Connect the core wire of the output cable of the test system to one phase of the cable, and the ground wire to the ground wire of the cable. How does the cable fault tester find the direction of the cable and estimate the buried depth of the cable? How does the cable fault tester find the direction of the cable and estimate the cable burial depth? Connect the core wire of the output cable of the test system to one phase of the cable, and the ground wire to the ground wire of the cable (lead package). (If the resistance value of the faulty phase is very low, a resistor of several hundred ohms can be connected in series between the output ground wire and the cable ground wire.) First adjust the output potentiometer to the minimum, turn on the power, and then adjust the amplitude knob to an appropriate position , at this time the instrument outputs a 15KHZ sinusoidal signal, this signal generates an electromagnetic field around the cable, adjust the path signal receiver“volume”and“fine-tuning”Turn the knob to make the sound in the earphone clear and pleasant, and you can find the cable path and estimate the depth of the cable burial.
1. Find and measure the cable path When the probe is at point B above the cable, the coil of the probe is parallel to the electric field, the coil does not cut the power line, the induced current in the coil is small, and there is almost no sound in the earphone. When the probe is at point A or point C, the sound in the earphone is louder. The line formed by the quieter points is the path of the cable.
2. Estimating the buried depth of the cable: Tilt the probe to the right at point B above the cable by 45°, and then go back perpendicular to the cable. When it retreats to point A, the probe is facing the cable, and the sound of the earphone is small at this time. The distance from point B to point A, that is, the distance back, is the depth of cable burial.
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