G-858AP
from Geometrics
Portable Caesium Magnetometer/Gradiometer and Professional Magnetic Mapping System the G-858 MagMapper uses a graphical interface to make survey design and data acquisition quick and efficient. Various modes of operation allow the user to custom design a survey grid for their particular needs.
The operator also has the ability to view his/her position on the grid and the current data profile during the survey. Sensitivity, resolution, and recording rate of the caesium magnetometer are user selectable. G-858 data acquisition offers either continuous or discrete station recording. The high sampling rate of the instrument in continuous mode allows the operator to survey an area at a fast walking pace. A wider search radius can be achieved by using a horizontal transverse gradiometer configuration.
As a result, over-all costs are inherently lower while data quality remains high. The G-858 is designed to interface easily with standard computers and peripherals. Geometrics encourages clients to provide their own processing computer hardware. Upon the client’s request Geometrics will provide a complete and fully integrated processing station at a nominal price.
Product Dimensions
| Physical | Dimensions (L x W x H) | Weight |
|---|---|---|
| G-858AP (instrument only) | 250cm x 60cm x 220cm | 11kg |
Technical Specifications
| Operating Range: | 20,000nT to 100,000nT |
|---|---|
| Noise: | <0.008nT√Hz-RMS |
| Heading Error: | 1.5nT including backpack and GPS |
| Gradient Tolerance: | >20,000nT/m |
| Temperature Drift: | <0.05nT per ºC |
| Cycle rate: | 0.1sec to 1hr |
| Data Storage: | Non-volatile RAM, suitable for 12 hours continuous data acquisition. |
| Data Output: | RS232 serial |
| Power: | 24V DC recharganle Gel Cell batteries. 6 hours operation as Magnetometer and GPS 3 hours operation as Gradiometer and GPS |
| Operating modes: | - mapped survey - Simple survey - Base Station - Search |
| Operating Temperature: | -25ºC to +50ºC |
Shipping
| Contents | Dimensions (L x W x H) | Weight |
|---|---|---|
|
Case 1
G-858 |
80 x 40 x 30 | 30 |
Data Sheet
- G-858AP Datasheet (PDF)
Literature
- Applications Manual for Protable Magnetometers (PDF 1MB)
- Magnetic Gradiometer Surveying in Areas of High Ambient Noise (PDF 520KB)
- Theory of Operation of Caesium Vapour Magnetometers (PDF 122KB)
- Total Field Magnetometers Theory and Applications (PDF 122KB)
Checklists
- Checklist for Data Storage and Transfer (PDF 249KB)
- Checklist for Data Processing (PDF 190KB)
- Checklist for Field Editing (PDF 244KB)
- Checklist for GPS Operating Procedures (PDF 231KB)
- Checklist for Instrument Storage (PDF 138KB)
- Checklist for Out of Box Equipment Tests (PDF 228KB)
