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Bore and Bore (BNB)
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  5. BNB - Model GEA24 - Compact-Sized 24 ...

BNB - Model GEA24 -Compact-Sized 24 Channel Exploration Seismograph

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GEA24 is a compact-sized 24 channel seismograph (2 units can be serialized for a total of 48 chs.) with a 24 bit data acquisition board and USB interface for external PC (not included in the standard supply). Suitable for so many applications, GEA-24 is a really affordable solution for all professional uses.

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  • Refraction
  • Shallow Reflection
  • Surface Waves (Masw, Re.mi., Vs30, Maam, Esac, Etc.)
  • Hvsr / Vibrations
  • Downhole (with 3D borehole geophone Mod.GFA)
  • Crosshole (with 3D borehole geophone Mod.GFA and cross-hole energizer for P/S waves Mod.CHE)

  • 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
    • Active Acquisitions:
      • up to 125 microsec (8000sps) on 24 chs,
      • up to 31.25 microsec (32000sps) on 6 chs
    • Passive Acquisitions:
      • up to 4000 microsec (250sps) on 24 ch
      • up to 500 microsec (2000sps) on 3 chs
    • Acquisition length 27500 samples @ 24 chs (+aux) 174500 samples @ 3 chs (+aux)
    • gain 0/52 dB, software selectable
    • Stacking Unlimited number of stacking
    • Input impedance 2MOhm // 22nF
    • Dynamic Range 144dB (system); >117dB (instantaneous, measured @1ksps)
    • Distortion 007% @16kHz
    • Bandwidth -3dB 8kHz@32ksps – 0.21 kHz@1ksps
    • Bandwidth +/- 0.1dB 5 kHz@32ksps – 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 bar display