Lviv Centre of Institute of Space Research

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Main features:

bulletHigh resolution and accuracy
bullet Low noise
bullet4 electric channels  (8 on demand)
bulletVery low temporal and thermal drift
bulletLow power consumption
bullet8 Gb SD card
bulletSatellite synchronization
bulletGraphical display with touch screen
bulletUSB output (RS232 or -422 on demand
bulletWaterproof plastic case
bulletTwo type lightning protection unit to choose



The Long-Period Telluric Instrument (LTI) LEMI-420E is developed for telluric field measurements signals with periods of 20100.000 seconds are recorded with very high sensitivity and low drift. In order to realize such design major attention was paid to thermal and temporal stability, high input impedance and low drift of electric channels. High-pass filter-free technology of input stages was used in order to let super-long period signals to pass. The lightning protection unit allows both the protection against nearby lightning discharges and easy connection of electric lines in the field. There are four electric channels in the instrument for measurements additionally of vertical component of telluric field or the components along some local geological structure. Specially developed very low noise LEMI-701 electrodes are recommended (at the photo, right), but any other electrode types may be used too.


Frequency band DC-0.5 Hz
Measured range 2500 mV
Resolution 2 nV
Sampling rate 1 per s
SD card 8 Gb
Digital output and control USB
Operating temperature range minus 20 to +60 C
Power supply (5-20) V
Power consumption < 0.35 W
   Electronic unit
   Lighting protection unit

2.0 kg
1.1 kg

GPS timing, coordinates and altitude determination (antenna cable length 3m)

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Last modified: 22-02-2017

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