| Electromagnetic method is based on electromagnetic induction principle of natural or artificial (controlled) field excitation source in the earth in the distribution of the alternating electromagnetic field.Controlled source audio frequency magnetotelluric method (CSAMT) is an electromagnetic method, its main feature is to do manual control of the field source frequency sounding. Transient electromagnetic method (TEM) is the use of non-grounding wire or grounding wire back to the source to the underground launch a pulsed magnetic field, pulsed magnetic field in a coil or intermittent use of grounding electrode during the observations caused subsurface secondary induced eddy current field.At present, the instrument has been commercialized by Canadian Phoenix with the United States ZONGE company developed. The United States ZONGE produced GDP16 and GDP32 type of equipment.The studied data pretreatment system, characterized by the following:(1).Read the original file. RAW, you can actually read the full collection of all data, of course, much of the data contained errors, or the wrong data.(2).Read the original documents processed. AVG file.(3).Provides two data display. One is the whole show, The other is the display after data classification(4).Draw. RAW and. AVG data file of amplitude and phase curve.(5).Operation in the customer area by the mouse on. RAW data edit. And. AVG real-time graph shows the results after editing.(6).Upon completion of data editing, editing can be drawn and edited before the apparent resistivity and impedance phase stripes.
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