LEMI-418

Product type:
Wide band magnetotelluric station for field survey

Product description:
Modular construction
3+3 magnetic field components measurements
4 telluric field channels
2 types of magnetometers (flux-gate and search-coil)
Wide frequency range (DC…200) Hz
Satellite timing
Excellent temperature stability
High suppression of industrial noise
Special software and calibration
Real-time data acquisition and visualization
Digital interface

Application description:
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.

Highlights:
Low noise level

Product image:

Specifications:

  • Flux-gate magnetometer
  • Full measuring range ±68000 nT
  • Frequency band (DC-0.3) Hz
  • Noise level: in frequency band (0.01-0.3) Hz | (±68000 nT)
  • Noise level: at 0.1Hz (10 s) | (DC-0.3) Hz
  • Temperature drift | ( < 0.2 nT/°C)
  • Weight of the sensor with 10 m cable | (1.8 kg)
  • 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) | (20 mV/nT)
  • Noise level: at 0.001 Hz | (< 100 pT/√Hz)
  • Noise level: at 0.01 Hz | (< 10 pT/√Hz)
  • Noise level: at 1 Hz | (< 0.1 pT/√Hz)
  • Noise level: at 100 Hz | (< 0.01 pT/√Hz)
  • Weight of the sensor | (5.8 kg)
  • Electric field meter
  • Frequency band (DC-200) Hz
  • Measuring ranges (for measuring base 1 m):at gain=1 | (± 7500 mV)
  • Measuring ranges (for measuring base 1 m):at gain=10 | (± 750 mV)
  • Measuring ranges (for measuring base 1 m):at gain=100 | (± 75 mV)
  • Measuring ranges (for measuring base 1 m):at gain=1000 | (± 7.5 mV)
  • Offset compensation range | (±7500 mV)
  • Noise level in frequency band (0.01- 0.3) Hz | (0.1 μVrms)
  • Power supply voltage | (9-18 V)
  • Power consumption | (6 W)
  • Weight of the electronic unit | (< 4 kg)
  • Operation temperature range | (-20 °C to +60 °C)
  • Waterproof housing

Additional Information:

LEMI-418_Datasheet.pdf