The Grad601 is a high-resolution fluxgate gradiometer, used for measuring minute variations in the magnetic field that are caused by hidden anomalies in the ground, such as archaeological features, pipes, cables or unexploded ordnance (UXO).The full system includes a data logger, a battery cassette, and either one or two Grad-01-1000L sensors mounted on a rigid carrying bar. Calibration is easy following an automated procedure.
The data logger’s non-volatile flash memory will hold surveyed grids. These can be downloaded as individual files, so different-size grids may be recorded during a survey. For GPS-based surveys, a cart system can be supplied for mounting of Grad-01-1000L sensors.
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• Electronic adjustment
• Selectable resolution 0.01nT or 0.1nT (Grid mode); 0.1nT (NMEA mode)
• 50Hz or 60Hz filter for mains rejection
Bartington Grad601 Instrument Assembly
GEM’s Overhauser Magnetometer system is a revolutionary geophysical instrument developed by GEM to offer a rugged, low power, and sensitive alternative to Proton Precession and some other alkali vapour magnetometers.
GEM’s GSM-19 (Overhauser) magnetometer is a primary standard in mineral exploration and magnetic observatories. As a standard for magnetic observatories, this system has proven itself – for its high sensitivity, absolute accuracy and long life.
Not only do the GPS technologies tell you where you have been, but they tell you where you need to go. This allows for highly accurate readings via ‘Waypoint Programming’ as well as accurate time synchronization for base station corrections.
With Waypoints, you design your survey on your personal computer and import the stations with ease into the magnetometer console. Then, the system will guide you to each Waypoint where a reading is to be made. With ‘Walking’ mode, you have a nearly continuous record of GPS-referenced data points – a major advantage in surveying because you save time in the field and it eliminates the possibility of positioning mistakes.
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Sensitivity: 0.022 nT @ 1 Hz, (0.015 nT option)
Resolution: 0.01 nT
Absolute Accuracy: +/- 0.1 nT
Dynamic Range: 20,000 to 120,000 nT
Gradient Tolerance: Over 10,000 nT/m
Sampling Intervals: 60+, 5, 3, 2, 1, 0.5, 0.2 sec
Operating Temperature: -40°C to +50°C
• Pipeline mapping
• UXO detection
• Mineral exploration
• Other engineering and environmental applications