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WIDE BAND MAGNETOTELLURIC STATION LEMI-419 FOR FIELD SURVEY

Main features:

bulletAC magnetic field sensors
bullet4 telluric field channels
bulletWide frequency range (0.0001...300) Hz
bulletSatellite synchronization
bulletExcellent temperature stability
bulletLow noise level
bulletAll sensors are calibrated
bulletSpecial software for real-time data acquisition and visualization
bulletDigital interface
bulletTwo types of lightning protection units to  select
 

Main applications:

bulletExploration of gas, oil and other deposits
bulletSurveying Earth conductivity
bulletBasic regional survey
bulletEarthquakes monitoring

Composition (left to right):

bullet

3 induction sensors

bullet

Lightning protection units

bullet

Electronic unit

bullet

GPS antenna

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Data Registration Unit (optional)
 

WIDE BAND MAGNETOTELLURIC STATION LEMI-419 FOR FIELD SURVEY


Wide band magnetotelluric station LEMI-419 is intended for the study of natural electromagnetic fluctuations in field conditions in wide temperature range. The station registers and digitizes automatically the data from 3 search-coil magnetometers and 4 electric channels and monitors the temperature of electronic unit. The electric channels include lightning protection unit, one of two its constructions differing by the way to connect electric lines (see photo) may be selected. The real time acquisition, recording and visualization of current and previously recorded data are executed in the external PC or in the Data Registration Unit (optional), to which digital data are transferred through serial RS-422 port. The station operation is GPS synchronized.

MAIN TECHNICAL PARAMETERS

1. Search-coil magnetometer

Frequency band (0.0001-300) Hz
Shape of transfer function Linear-flat
Corner frequency 1 Hz
Transfer factor at flat part  200 mV/nT
(or other on demand)
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

2. Electric field meter

Frequency band (DC-300) Hz
Measuring ranges (for measuring base 1 m):
  at gain=1
  at gain=1
0
  at gain=1
00
  at gain=1
000
5000 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 μVrms
Non-polarized electrodes (optional) own noise in  frequency band (0.010.3) Hz < 10nV

3. Electronic unit

Power supply voltage (9-18) V
Power consumption 4 W
Weight < 4 kg
Operation temperature range minus 20 C to +60 C
Waterproof housing

4. Data Registration Unit (optional)

Processor Intel Atom Z510 1.1GHz
USB interface 2 x USB 2.0
Power consumption
Power consumption when display is off
< 12 W
< 7 W

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Last modified: 25-11-2014

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