PASI - Model Gemini 2 Hz -3D Land Geophone with USB Interface - HVSR, VS30, VIBRATION ANALYSIS, SEISMIC CHARACTERIZATION

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