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لرزه سنج S-20 یک لرزه سنج سه مولفه ای با فرکانسی نزدیک به لرزه سنج های باند پهن است. پهنای باند فرکانسی از 50Hz ، تا 20sec گسترش یافته است.| eneral | Surface Type | Borehole Type |
| Number of channels | 3 | 3 |
| Orientation | Vert ical , North-South, East-West | Vert ical , North-South, East-West |
| Supply | 12Vdc (10-18Vdc) | 12Vdc (10-18Vdc) |
| Mount ing | Three adjustable legs | Elastic Packer or Guiding Wheels |
| FEATURES | ||
| Sensi t ivity | 1500 V/m/sec | 1500 V/m/sec |
| Coi l Resistance | 3500 Ohms | 3500 Ohms |
| Damping | 0.7 critical | 0.7 critical |
| Bandwidth | 0.05Hz – 50Hz | 0.05Hz – 50Hz |
| PHYSICAL | ||
| Cable length | Standard 10m | Standard 10m, up to 150m |
| Size (geophone enclosure) | 130mm diameter | 420mm length, 80mm diameter |
| Weight( with 20m cable) | 4.6kg | 4.8kg |
| ENVIRONMEN | ||
| Temperature range | -20 to +70oC | -20 to +70oC |
| Humidi ty | Submersible 5m | Submersible 500m |