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WIDE BAND MAGNETOTELLURIC
STATION
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Main features:
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Wide band magnetotelluric station LEMI-418 is intended for the study of Earth’s crust electromagnetic structure in frequency band (DC-200) Hz in field conditions in wide temperature range. The station maintains automatically measurements and digitizing data from the flux-gate and search-coil magnetometers, 4 telluric channels and temperatures of sensor and electronics. The real time acquisition, recording and visualization of current and previously recorded data are executed at an external computer to which digital data are transferred through serial RS-422 port. The operation is synchronized with GPS timing. |
| 1. Flux-gate magnetometer | |
| Full measuring range | ±68000 nT |
| Frequency band | (DC-0.3) Hz |
| Noise level at flat part of frequency response | < 8 pT rms |
| Temperature drift | < 0.2 nT/°C |
| Weight of the sensor with 10 m cable | 1.8 kg |
| 2. Search-coil magnetometer | |
| Frequency band | (0.0001-200) Hz |
| Shape of transfer function | linear-flat |
| Corner frequency (or other on demand) | 1 Hz |
| Transfer factor at flat part (or other on demand) | 200 mV/nT |
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Noise level: at 0.001 Hz at 0.01 Hz at 1 Hz at 100 Hz |
<
100 pT/√Hz < 10 pT/√Hz < 0.1 pT/√Hz < 0.01 pT/√Hz |
| Weight of the sensor | 5.8 kg |
| 3. Electric field meter | |
| Frequency band | (DC-200) Hz |
| Measuring ranges (for measuring base 1
m): at gain=1 at gain=10 at gain=100 at gain=1000 |
± 7500 mV ± 750 mV ± 75 mV ± 7.5 mV |
| Offset compensation range | ± 7500 mV |
| Noise level in frequency band (0.01- 0.3) Hz | 0.1 μV rms |
| 4. Power supply voltage | (10-18) V |
| Power consumption | 6 W |
| 5. Weight of the electronic unit | < 4 kg |
| 6. Operation temperature range | minus 20 °C to +60 °C |
| 7. Waterproof plastic case | |
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