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.

Geometrics G-858 Gradiometer & GPS setup
Geometrics G-858 Gradiometer & GPS setup

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