LEMI 419

Lviv Centre of Institute of Space Research

OLD Product!

WIDE BAND MAGNETOTELLURIC STATION LEMI-419 FOR FIELD SURVEY

Main features:

	AC magnetic field sensors
	4 telluric field channels
	Wide frequency range (0.0001...300) Hz
	Satellite synchronization
	Excellent temperature stability
	Low noise level
	All sensors are calibrated
	Special software for real-time data acquisition and visualization
	Digital interface
	Two types of lightning protection units to select

Main applications:

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

Composition (left to right):

	3 induction sensors
	Lightning protection units
	Electronic unit
	GPS antenna
	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=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 (optional) own noise in frequency band (0.01…0.3) 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

Last modified: 01-02-2018