MARINE EXPLORATION
OBX-750E
OBX-750E: Ocean Bottom Recorder
PRODUCT DETAILS
The OBX-750E is a seabed ocean bottom wireless seismic data acquisition node with a maximum operating depth of 750 meters. Nodes can be deployed in shallow offshore waters and transition zones, which include estuaries, marsh wetlands, and freshwater environments, such as rivers and lakes. Once deployed, the OBX-750E can collect seismic data continuously for up to 60 days.
FEATURES
- Continuous, cable-free 4C autonomous recording
- Maximum operating depth: 750 meters
- Battery module: 60 days
- Built-in, full-resolution test generator
- Solid-state flash memory: 8 GB per channel
- OVCXO clock
GS-ONE OMNI Geophone
PHYSICAL SPECIFICATIONS
| Moving Mass | 13.2 g | 0.466 oz |
| Maximum coil excursion p-p | 4.06 mm | 0.16 in. |
| Minimum coil excursion p-p | 1.02 mm | 0.04 in. |
| Diameter | 30.5 mm | 1.2 in. |
| Height | 40.7 mm | 1.6 in. |
| Weight | 130 g | 4.60 oz |
| Operating and Storage Temperature Range | -40°C to +100°C | -40°F to +212°F |
ELECTRICAL SPECIFICATIONS
| All parameters are specified with 7.5 kΩ load at 25°C in all tilt positions unless otherwise stated. |
|
| Frequency | 15 Hz |
| Spurious Frequency | >160 Hz |
| Distortion at Horizontal | 0.05% Typical |
| Resistance with 7.5 kΩ load | 1450 Ω |
| Sensitivity at 70% Damping | 69.2 V/m/s (1.75 V/in/s) |
| Damping | 70% |
| Distortion at all tilt angles | 0.2% measured at 15 Hz with 0.2 in/s p-p |
Hydrophone MP-18BH
ELECTRICAL SPECIFICATIONS
| Nominal Capacitance (at 25°C 1atm) | 16.0 nanofarads |
| Voltage Sensitivity 2 | 4 V/Bar |
| Sensitivity (dBv ref 1µPa @ 25°C) | –208 |
| Frequency Response (into 2 MΩ load) | 5–1000 Hz (typical) |
OBX-750E
MECHANICAL SPECIFICATIONS
| Metric | US | |
| Length | 521 mm | 20.5 in. |
| Width | 208 mm | 8.2 in. |
| Height | 108 mm | 4.25 in. |
| Weight in Air | 11.85 kg | 26 lbs. |
| Weight in Seawater | 4.1 kg | 9.0 lbs. |
| Maximum Operating Pressure | 7.5 MPa/75 Bar | 1095 psi |
| Maximum Operating Depth | 750 M | 2460 ft. |
| Operating Temperature Range | –5°C to +50°C | +23°F to +122°F |
ELECTRICAL SPECIFICATIONS
| Digitized 4C Recording Station: 4 Channel, 24 Bit A/D Digitizer Orthogonal oriented GS-One OMNI Geophones 1 MP-18BH-2500 Hydrophone |
|
| Digitization | 24-bit Delta-Sigma |
| Sample Interval | 0.25, 0.5, 1, 2, 4 ms |
| Pre-amplifier Gains | 0, 6, 12, 18, 24, 30, 36 dB |
| Maximum Input Signal | 1.8Vrms |
| Equivalent Input noise (@2ms sample interval) | 0.17 μVrms |
| Gain Accuracy | Better than 1% |
| Anti-alias Filter | 83% Nyquist |
| Instantaneous Dynamic Range | 124dB @ 2 ms sample interval |
| THD | <0.2% |
| Distance Between Digitizer & Farthest Sensor | <18 cm |
| Distance Between All Sensors | <13 cm |
| Flash Memory | 8 GB per channel |
| Frequency Response | 1 Hz – 1650 Hz @ ¼ ms sample interval |
| Battery Module | 60 days operation |
