Table T13. Specifications of the Göttingen Borehole Magnetometer, Expedition 330.
| Component | Specification |
|---|---|
| Borehole magnetometer | Three-component fluxgate |
| Power supply | 50 V/0.25 A (12 W) |
| Random walk of fluxgate sensors (nT) | <0.1 |
| Range (µT) | ±50 (x and y magnetometer), ±70 (z magnetometer) |
| Resolution (nT) | 6.1 (x and y magnetometer), 8.54 (z magnetometer) |
| Data transmission | Digital two-wire Manchester encoded |
| Sample rate | Eight readings from 8 channels/s |
| Data acquisition system | Personal computer (DOS) |
| Tool weight (kg) | 68 |
| Tool length (m) | 3.5 |
| Tool diameter (mm/inch) | 86 (3.375) |
| Housing | Low-magnetic monel |
| Maximum operation temperature (°C) | 0–70 (limited by FOGs) |
| Maximum operation pressure (MPa) | 70 |
| Recommended logging speed (m/h) | 300 (open hole) |
| Maximum logging speed (m/h) | 3700 (limited by hole diameter) |
| Tool navigation system | Three FOG µFORS-36 m (LITEF) |
FOG = fiber-optic gyro, µFORS = miniature fiber-optic rate sensor.
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