seismograph with a 24 bit acquisition board with USB interface for external PC (not Suitable for Downhole and Crosshole applications, it's perfect also for small scale seismic refraction and surface waves analysis DOWNHOLE (with borehole triaxial geophones Mod.GFA or Mod.DHTG) CROSSHOLE applications (with borehole triaxial geophones Mod.GFA or Mod.DHTG + P/S wave borehole seismic source) Small scale REFRACTION MASW and Vs30 acquisitions with Foundation studies Evaluation of excavation cost GEA 3 Acquisition software "screenshot" Software available in: English - French - Spanish - Italian P.A.S.I. S.R.L. — Via Galliari 5/E — 10125 Torino e-mail: [email protected] web: www.pasisrl.it

GEOPHYSICS 3 CHANNELS SEISMOGRAPH PASI MOD. GEA 3 www.pasigeophysics.com TECHNICAL SPECIFICATIONS GEA 3 GEA 3 Model 3 chs + trigger 24 real bits A/D Sigma-Delta Number of signals acquired Data Conversion Sampling frequencies 20, 100, 200, 500, 1000, 2000, 4000, 8000 Hz from 250 ms to 30 minutes Acquisition duration selectable up to 20 stack Stacking 2 MΩ Input impedance max. 117db S/N ratio Passband at +/- 0.1 dB 108 Hz Passband at – 3dB 212 Hz Trigger Trigger sensitivity adjustable Display mode of the traces Noise-monitor...