SY/T 5820-2020 in English

When using V8, ADU-07 and other instrument systems, the following must be met:

• Electrode pairing range ≤2mV (UBMT requires ≤1mV)
• Magnetic bar buried depth ≥30cm (horizontally placed for water construction)
• Instrument calibration relative error ≤2% (calculated in Formula 2)

Case: Exploration in igneous rock covered areas

Using the UBMT method in the XX basin:

1. Observation time ≥ 144 hours to ensure the quality of low-frequency signals
2. Calculate the minimum frequency 0.0003Hz according to formula (1)
3. Use a cross-shaped electrode layout with an electrode burial depth of 50cm
4. The distance between the remote reference station and the interference source>2km

Electromagnetic interference prevention and control

Strictly implement the distance requirements in Table 1:

• High-voltage power line>500m
• Communication base station>1km
• Use the LMS system to monitor noise in real time

Special terrain treatment

Mountainous work areas can adopt:

• T/L type flexible pole layout (Figure 4)
• Electrode height difference ≤ 10% of pole distance
• Electrode burial depth in frozen soil areas is lower than the frozen layer