GEA-24
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GEA-24

24-channel seismograph

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Description

GEA24 is a compact-sized 24 channel seismograph (can be serialised for a total of 48 chan.) with a 24 bit data acquisition board and USB interface for external PC (not included in the standard supply). Suitable for refraction, seismic tomography, downhole, crosshole, Vs30, MASW, shallow reflection applications, GEA-24 is a reliable, affordable solution for all professional uses.

Connected to your PC laptop or tablet, GEA24 becomes a seismic tool that is simple to use, but with top-level performance. An external 12V battery (heavy and bulky) no longer needed: GEA24 consumes very little and is powered directly from the PC, guaranteeing a long day of work on-site. GEA24 can acquire using geophones with any resonance frequency (even 1Hz). To get 48 simultaneous channels, just connect two GEA24s to the same PC, perhaps using the Radiotrigger accessory and using a land streamer or a hydrophone chain.

Spesification

Number of channels 24 chs + trigger (AUX ch) - 2 units can be serialized for a total of 48 chs
Data Conversion 24 real bits Sigma-Delta ADC (compatible with analog geophones of any resonance frequency)
Sampling intervals Single acquisition (active and passive): -from 1 to 6 chs : up to 31.25 microsec/32000 Hz -from 7 to 12 chs : up to 62.5 microsec/16000 Hz -from 13 to 24 chs : up to 125 microsec/8000 HzContinuous acquisitions (passive): -from 1 to 3 chs : up to 500 microsec/2000 Hz -from 4 to 6 chs : up to 1 millisec/1000 Hz -from 7 to 12 chs : up to 2ms /500 Hz -from 13 a 24 chs : up to 4ms /250 Hz
Acquisition length 27500 samples @ 24 chs (+aux) 174500 samples @ 3 chs (+aux) Unlimited samples for continuous acquisitions
Preamp. gain LOW (0dB) - HIGH (52dB), software selectable
Stacking Unlimited number of stackings
Input impedance 2MOhm // 22nF
Dynamic Range 144dB (system); >117db (instantaneous, measured @1ksps
Distortion 0.007% @16kHz
Bandwidth -3dB Bandwidth +/- 0.1dB From DC to 6.8kHz@32ksps - from DC to 0.21 kHz@1ksps From DC to 3.5 kHz@32ksps - from DC to 0.11 kHz@1ksps
Filters Low Pass:125-200-500-1000Hz High Pass: 10-20-30-40-50-70-100-150-200-300-400Hz
Notch Filter 50-60Hz + harmonics
Trigger Normally closed contact, normally open contact (e.g. with explosive), analog signal (starter geophone, hammer switch), TTL triggering. Trigger sensibility adjustable via software
Trace Display Wiggle-trace / variable area
Noise-monitor All channels + trigger; real time display
AUX channel 1x (for trigger or any other input signal)
Communication interface 1x USB 2.0 to external PC (not included)
Data format SEG2 (other formats available on request)
Power supply 5VDC from USB, 0.25A
Operating/Storage Temp. from -30°C to + 80°C
Humidity 80% relative humidity, non condensing
Dimension and weight 24cm x19.5cm x11cm, 2kg Shock-resitant PELI CASE IP67
 

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