Electricity is in 1831. Before that, the lighting tool used by people is a kerosene lamp. The emergence of electricity completely broke the traditional illumination method, and the electricity is rich in our lives, making people's lifestyle toward another.
The cable is used as a transmission electrical electricity in 1831. Before that, the lighting tool used by people is a kerosene lamp. The emergence of electricity completely broke the traditional illumination method, and the electricity is rich in our lives, making people's lifestyle toward another.
It is also very important to use the cable as a transmission of electrical energy. What should I do if the cable has failed? Don't have an urgent cable path, let's take a look at the use process of the cable path. The use process of the cable path: (1) Take the test line of the instrument (Q9 cables of the output) is connected to the test cable.
The red line is connected to the cable core, the black wire clamping ground, and then turns it. Note: When shutting down, you should turn off the power supply of the path to disconnect the test line. (2) The probe is connected to the input jack of the fixed-point instrument, the fixed-point instrument is operated in the path state, the headphone plug is inserted into the output jack of the fixed-point instrument (the magnetic rod around the coil) and the ground vertical (Valley method) Move left and right, the audio signals heard in the headset, (beep) different size, when the signal is the smallest (sound valley point), the rod is the embedding position of the cable.
When you walk forward, swing on the left and right swings, the louder point (sound grain point) of the volume (sound grain point) in the earphone is the embedding path of the underground cable. (3) Under normal circumstances, the output should not be too large, and the signal is clear to prevent the measurement deviation due to mutual induction in the case where the plurality of cables are operated. (4) If you want to determine the depth of the cable, as mentioned earlier, the probe is inclined with the ground on a certain point on the measured cable path 45.°The direction of the cable path is moved perpendicular to the left or right, and when the volume signal in the earphone is the least, the distance between the probe is the buried depth of the cable.
(5) When the test cable is longer (typically 800M or more), the terminal can be shorted to increase the signal strength along the cable. When the cable is shorter, due to its low DC impedance, it is not possible to short the test cable terminal, and the terminal must open, otherwise the path gauge will occur.“Self-protection”Stop work. (6) When the cable has three-phase short circuit faults, and the fault distance is closer, in order to avoid the self-protection of the radio, there is a 10W resistance of about 200 or more of the 10W resistance between the path gauge and the measured cable to ensure the signal. Normal output.
(7) If the probe is faulty, you can refer to the following data:φ10 x140mm medium wave magnetic rod, around 285 包 包, in parallel 0.2μF of the capacitor constitutes a 15 kHz resonant circuit. Tap 70 times. Connect to the isolation core wire of the plug and the start end of the coil is connected to the isolation line.
The above is the use process of the cable path. Xiaobian is here to warmly prompt everyone, be sure to follow the process, pay attention to safety.
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