PASI s.r.l.

- Model Gemini 2 Hz - 3D Land Geophone with Usb Interface

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Gemini-2 represent PASI  answer to the increasing request for HVSR acquisition: a single waterproof case with integrated a low frequency, high performing 3D-geophone assembly (two versions available, with real 2Hz sensors properly coupled) and a powerfull true 24 bit data acquisition board. Through Gemini USB interface and the related data acquisition software your PC will be transformed in a perfect, very high performing instrument for both data recording and post-processing analysis.

Gemini-2 is a compact device for HVSR, MASW and Vibration Analysis: a single waterproof case with an integrated low frequency, high performing 3D-geophone assembly (with real 2Hz sensors properly coupled) and a powerful true 24 bit data acquisition board with USB port for external PC. 

Supported by its versatility and the easy to use user interface, GEMINI 2 with all its accessories allows you to perform the following surveys:

  • HVSR
  • SURFACE WAVES
  • ACTIVE SEISMICS
  • VIBRATION ANALYSIS & MONITORING
  • Holisurface® (data processing with third-party software)

Through Gemini USB interface and the related data acquisition software your PC becomes a perfect, high performance instrument for both data recording and post-processing analysis.
GPS option also guarantees georeferencing and timing of the Gemini; additional Gemini units can be further synchronized.

  • Power supply: through USB port
  • Sampling rate: from 20Hz to 8000 Hz
  • A/D Sigma-Delta converter resolution: 24 real Bit
  • Record time: from 60’’ to 30’ 
  • Acquisition channels: No. 3 + 1AUX
  • S/N ratio at fs=1KHz: 117 dB
  • S/N ratio at fs=8KHz: 109 dB
  • Passband at fs=1KHz: 110 Hz, proportional to sampling rate

  • Nat. Frequency: 2 Hz +/-10%
  • Sensibility: 2 V/cm•S-1 +/- 5% 
  • Internal Resistance: 5.8kΩ +/-5% 
  • Damping: 0.7 +/-10% 
  • Harmonic Distortion: ≤ 0.2% 
  • Insulating Resistance:≥ 10 MΩ 
  • Working Temp.: from -25°C to + 55°C 
  • Sensor clamping: automatic when not in use
  • Physical Dimensions: diam.128mm, h.175mm 
  • Weight: 2.4 kg

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