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LONG-PERIOD TELLURIC INSTRUMENT LEMI-417E

Main features:

bulletHigh resolution and accuracy
bulletLow noise
bullet4 electric channels
bulletVery low temporal and thermal drift
bulletLow power consumption
bullet2 GB internal memory
bulletSatellite synchronization
bullet4-lines digital display
bulletUSB output (RS–232 or -422 on demand)
bulletWaterproof plastic case
bulletLightning protection unit included

LONG-PERIOD TELLURIC INSTRUMENT LEMI-417E


The Long-Period Telluric Instrument (LTI) LEMI-417E is developed for telluric field measurements – signals with periods of 20…100.000 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.

MAIN TECHNICAL PARAMETERS

Frequency band (fourth-order LP filter) DC-0.15 Hz
Measured range 600 mV
Resolution 0.075 μV
Noise in the frequency band 0.03 – 0.3 Hz < 1 μV rms
Sample rate 1 per s
Volume of the internal FLASH-memory 2 GB
Digital output USB
GPS timing, coordinates and altitude determination (antenna cable length 3m)
Operating temperature range minus 20 to +60°C
Power supply +12+6-3V
Power consumption <0.8 W
Weight:
Electronic unit 2.0 kg
Lighting protection unit 1.1 kg

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Last modified: 04-08-2014

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