The instrument consists of transient electromagnetic probe tube, acquisition tablet computer and communication cable, simple structure, lightweight equipment, convenient operation. Based on the basic principle of transient electromagnetism, it adopts the method of "in-hole excitation - in-hole reception" to obtain the three-dimensional electrical spreading characteristics of the stratum medium within the radial range of 30m around the borehole, so as to find out the anomalous situation around the borehole. It can be applied to the hidden danger investigation in the fields of subway, tunnel, water conservancy, mine and so on, and can also be used in the field of resource exploration and so on.

(1) It can be used for the detection of long drill holes (not less than 800m) and meet the detection of radial 30m range;

(2) It has the advantages of 32G large-capacity storage space, more than 8 hours of working time, dynamic range of 258dB, and minimum resolvable voltage of 0.6nV;

(3) The host of the serial port connection probe tube, the host can realize the function of setting reference of the probe tube, judging the connection state of the probe tube, synchronizing the data and hitting the point to record the number of times of drilling rods;

(4) Drilling trajectory measurement function, which can record the azimuth, inclination and roll angle information of the probe tube in real time, and can record the trajectory of the drilling hole in real time, which improves the ability to locate the anomalies;

(5) With a variety of data processing and analysis methods, it can realize two-dimensional and three-dimensional display of the anomalous body.