LEMI 418

Lviv Centre of Institute of Space Research

OLD Product!

WIDE BAND MAGNETOTELLURIC STATION LEMI-418 FOR FIELD SURVEY

Main features

	6 magnetic field channels with 2 types of magnetometers (3 for flux-gate and 3 for search-coil)
	4 telluric field channels
	All channels are calibrated
	Wide frequency range (DC …300) Hz
	Satellite synchronization
	Excellent temperature stability
	Low noise level
	Special software for real-time data acquisition and visualization
	Digital interface
	Two types lightning protection units to select

Main applications

	Exploration of gas, oil and other deposits
	Surveying deep Earth conductivity
	Basic regional survey
	Earthquakes monitoring

Composition (left to right)

	3 induction sensors
	Flux-gate sensor
	Lightning protection units
	Electronic unit
	GPS antenna
	Data Registration Unit (optional)

WIDE BAND MAGNETOTELLURIC STATION LEMI-418 FOR FIELD SURVEY

Wide band magnetotelluric station LEMI-418 is intended for the study of Earth’s crust electromagnetic structure in frequency band (DC-300) Hz in field conditions in wide temperature range. The station maintains automated measurement and digitizing of the data from flux-gate and search-coil magnetometers, 4 telluric channels and thermal sensors inside flux-gate sensor and electronic unit. 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. Flux-gate magnetometer
Full measuring range	±70000 nT
Frequency band	(DC-0.3) Hz
Noise level in frequency band (0.01-0.3) Hz at 0.1Hz (10 s)	< 10 pTrms 20 pT/√ Hz
Temperature drift	< 0.2 nT/°C
Weight of the sensor with 10 m cable	1.8 kg

2. Search-coil magnetometer
Frequency band	(0.0001-300) Hz
Shape of transfer function	Linear-flat
Corner frequency	1 Hz (or other on demand)
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

3. Electric field meter
Frequency band	(DC-300) Hz
Measuring ranges (for measuring base 1 m): at gain=1 at gain=10 at gain=100 at gain=1000	± 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 μV rms
Non-polarized electrodes own noise in frequency band (0.01…0.3) Hz	< 10 nV

4. Electronic unit
Power supply voltage	(9-18) V
Power consumption	5 W
Weight of the electronic unit	< 4 kg
Operation temperature range	minus 20 °C to +60 °C
Waterproof housing

5. 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

Last modified: 01-02-2018