Electromagnetic induction: Its basic working principle is: the transmitter generates electric and magnetic waves and transmits the transmission signal to the underground cable through different transmission connection methods. After the underground cable senses the electromagnetic wave, an induced current is generated on the surface of the underground cable. The induced current will propagate along the cable to a distance. During the propagation of the current, the electromagnetic wave will be radiated to the ground through the underground cable. In this way, when the underground cable detector receiver detects on the ground, it will receive the electromagnetic wave signal on the ground just above the underground cable. The position and direction of the underground cable can be determined by the change in the strength of the received signal.
The conditions for the realization of this principle: First, there must be a signal source that can generate enough electrical energy to form a current in the line that can transmit electrical energy. The current generates a magnetic field around the line during the flow; second, there must be a circuit that can receive this specific magnetic field and display the change process of the magnetic field in the form of an electrical signal.
1. It can detect the direction and depth of underground cables;
2. It can expand the wireless detection method, which is simple to operate and easy to use;
3. The instrument has powerful data processing capabilities and a friendly display interface LCD display;
4. Digital design, software control, stable and reliable performance;
5. Information is reflected in various ways such as digital size, grating floating drop, sound, etc.;
6. Patented technology of signal full-range vibration prompt function;
7. Constant power output and automatic matching to ensure that the machine works in the best state;
8. Flexible output switching mode, which can automatically switch to the sleep mode with minimum power consumption.
A. Transmitter parameters
1. Output signal: low frequency AC, high frequency AC;
2. Output power: constant power output, 50%, 100% (maximum 1 watt);
3. Output mode: direct connection method;
4. Impedance display: within 100kΩ;
5. Load matching: 1~2.5kΩ;
6. Display mode: LCD Chinese, digital, graphic display, with backlight;
7. Battery model: The whole machine uses 6 standard No. 5 1.2V rechargeable batteries, charge and discharge 500 times;
8. Working time: more than 6 hours;
9. Working conditions: temperature -10℃-+45℃, relative humidity 90%;
10. Overcurrent: automatic protection;
11. Weight: about 0.8kg.
B. Receiver parameters
1. Working frequency: low frequency, high frequency, industrial frequency;
2. Working mode: peak method, trough method, external input method;
3. Antenna mode: one horizontal coil, one vertical coil;
4. Sound indication: FM tone that changes with signal strength;
5. Battery model: The whole machine uses 6 standard No. 7 1.2V rechargeable batteries, which can be charged and discharged 500 times;
6. Display mode: LCD Chinese, digital, graphic display, with built-in backlight;
7. Signal strength indication: graphic display, digital range 0~999 display;
8. Gain control: manual adjustment, range is 0~99dB;
9. Depth measurement: three-digit display, the maximum depth can reach 2.5 meters;
10. Working time: more than 8 hours;
11. Working conditions: temperature -10℃-+45℃, relative humidity 90%;
12. Weight: about 1.2 kg.
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