Cable recognizer and cable fault tester have been introduced in previous articles. I believe you have a simple understanding of the functions and characteristics of these two devices. Some netizens have consulted Xiaobian before. What is the difference between the two devices? In order to meet everyone's thirst for knowledge, Xiaobian will give you a brief introduction today. The difference between cable identification instrument and cable fault tester: first of all, it should be distinguished. Cable identification instrument is the function of identifying cable, and cable fault tester is the function of finding path. It is basically the same in principle, and there are great differences in function and use method. For example, the measurement of cable fault tester must be in power failure state, while cable identification instrument can be live measurement; The cable identification instrument can accurately identify a cable, while the cable fault tester can only be an accurate path direction. Today, let's talk about the technical principle of the cable identification instrument and the use method of the cable identification instrument. 1ã Technical principle of cable identification instrument: firstly, the identified cable needs to be grounded at the far end. The generator feeds periodic unipolar voltage pulses into the cable to be identified, and the outgoing current only passes through this cable. All other adjacent cables flow return current, but their polarity is opposite. In addition to the difference in current direction, the current amplitude is also an identification feature, The outgoing current only passes through one cable, while the return current can pass through several cables, which means that the current flowing out is greater than the return current flowing through other cables. The receiver detects the direction and size of the current flowing through the cable, and the generated magnetic field induces a voltage in the sensor coil. The voltage polarity is determined by the current direction and the direction of the sensor coil, The voltage induced in the sensor coil displays the measurement result in the meter. 2ã Differences between cable identification instrument and cable fault tester 1. Set the test circuit. In order to ensure the normal use of the instrument, pay attention to setting the test circuit. Connect the red output jack to the core of the cable to be identified, connect the black output jack to the ground, and connect the cable core to the ground at the far end. 2. When the instrument calibrates the receiver, use the sensor to clamp the cable (close to the generator) at the beginning, the arrow points to the current direction, that is, to the far end of the cable, and then use the same receiving sensitivity for detection at the place to be detected. Use the sensor to clamp each cable once, and the arrow direction points to the far end of the cable. When the cable to be identified is clamped, The reading on the receiver meter is 4-6 grids and deflects to the right. All other cables either have no reading, or the reading is very small and the current direction is opposite, that is, deflects to the left. The cable identification instrument is only the function of identifying the cable. If it is necessary to operate the cable, the identified cable must be pricked and grounded with the cable pricker according to the power test standard. Do not use manual sawing before grounding.