| Customization: | Available |
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| Accuracy: | <1mm |
| Horizontal Line: | 1 |
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The GS-20DX equivalent digital grade geophone is compatible with all field data acquisition system. All operating parameters are confirmed with computerized test system during the manufacturing process. The 20DX classic digital grade geophone is the industry standard. Its rugged design with pigtail construction ensures relability and data integrity in field conditions.
- Industry standard for cost effectiveness, quality and reliability.
- Typical spurious response greater than 250Hz.
- 5% frequency and damping tolerance for minimum phase shift.
- Waterproof land and marsh case require no poting and provide easy access to basic units.
- Choice of three standard natural frequencies (8Hz, 10Hz,14Hz,28Hz,40Hz,60Hz and 100Hz).
- 3-year limited warranty on geophone elements exclusive of high voltage, lightning or physical abuse.
| Type | ST-20DX 8hz | ST-20DX 10hz | ST-20DX 14hz | ST-20DX 28hz | ST-20DX 60hz | ST-20DX 100hz |
| Natural frequency ( Hz ) | 8±5% | 10±5% | 14±5% | 28±5% | 60±5% | 100±5% |
| Open circuit damping | 0.38 | 0.30 | 0.22 | 0.22 | 0.51 | 0.45 |
| Damping with Shunt Resistor | 0.71±5% | 0.707±5% | 0.51±5% | 0.552±5% | \ | \ |
| Open Circuit Intrinsic Voltage Sensitivity(v/m/s) | 28.0 | 28.0 | 28.0 | 39.0 | 35.5 | 23.0 |
| Sensitivity with Shunt Resistor(v/m/s) | 23.0±5% | 20.0±5% | 20.0±5% | 28.0±5% | \ | \ |
| Coil Resistance (ohm) | 395±5% | 395±5% | 395±5% | 395±5% | 610±5% | 570±5% |
| Harmonic Distortion ( % ) | ≤0.2 | ≤0.2 | ≤0.2 | ≤0.2 | ≤0.2 | ≤0.2 |
| Typical Spurious Frequency ( Hz ) | ≥180 | ≥200 | ≥250 | ≥350 | ≥450 | ≥600 |
| Moving Mass ( g ) | 11.0 | 11.0 | 11.0 | 11.0 | 6.5 | 5.0 |
| Max.coil excursion p-p (mm) | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 |
| Max.tilt angle | 20º | 20º | 20º | 20º | 20º | 20º |
| Element Diameter (mm) | 25.4 | 25.4 | 25.4 | 25.4 | 27.0 | 27.0 |
| Element Height (mm) | 33.5 | 33.5 | 33.5 | 33.5 | 33.5 | 33.5 |
| Element Weight (g) | 87.0 | 87.0 | 87.0 | 87.0 | 95.0 | 95.0 |
| Operating Temperature(ºC) | -45ºC to + 100ºC | --45ºC to + 100ºC | -45ºC to + 100ºC | -45ºC to + 100ºC | -45ºC to + 100ºC | -45ºC to + 100ºC |
| All parameters specified herein are rated at a temperature 20ºC±2ºC | ||||||
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