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ULF MONITORING SYSTEM
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ULF
monitoring system is intended for
earthquake magnetic precursors study
in low-noise
areas. It consists of three search-coil magnetic sensors LEMI-30 and
communication unit The
induction sensor LEMI-30 designed for the study of magnetic field
fluctuations in the frequency band 0.01 ... 30 Hz in land conditions. It
can be used both as a part of a computer measuring and registration
equipment and autonomously with any analogue measuring device. The
communication unit |
| Frequency band of received signals | 0.01..30 Hz |
| Transformation
factor frequency response from 0.01 Hz to 1 Hz from 1 Hz to 30 Hz |
20´f
mV/nT* 20 mV/nT |
| Auxiliary output gain | 20 dB |
| Full band transformation factor error | £3 dB |
| Magnetic
noise level at 0.01 Hz, 0.1 Hz, 1 Hz, 10 Hz..30 Hz |
£20
pT´Hz-1/2 |
| Mains interference rejection | >60 dB |
| Power consumption | ±(12±1)V, ±7.5mA |
| Temperature range of operation | minus 10 ¸ +50oC |
| Dimensions of one LEMI-30 sensor | l
= 900 mm; Æ =100 mm |
| Mass of one LEMI-30 sensor | 6.5 kg |
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