Geomatrix Earth Science Ltd
The Grad 601-2
is a dual vertical component fluxgate gradiometer
with data logger and either one or two cylindrical sensor assemblies for use
in geophysics and archaeology. Each sensor assembly contains two fluxgate
magnetometers with a one metre vertical separation together with electronics
and non-volatile memory for calibration data. The system provides an
enhanced depth response, exceptional stability and electronic adjustment.
The Grad 601 is ideal for both archaeological prospection and the location
of pipes, cables, drums and archaeological features. The Grad 601-2
is a two-sensor version is designed for
archaeological prospection and allows geophysical surveys to be completed in
about half the time. The large non-volatile flash memory and fast
downloading of data offer improved survey efficiency.
These gradiometers have a linear range of 100nT with a resolution of 0.1nT
and a range of 1000nT with a resolution of 1nT. A compressed response is
provided to 30,000nT.
The exceptional temperature stability of the sensors ensures minimal drift
during surveys and reduces the need for adjustment. All adjustments are
accomplished automatically using a single pushbutton and audible cueing.
The Grad 601-2 dual gradiometer
is supplied complete with cables and accessories in a rugged carrying
case. The Grad 601-2 dual gradiometer includes an adjustable harness which
completely relieves the operator's arms whilst carrying the instrument.
Features
* 1m vertical spacing for deep anomalies
* 1 or 2 sensor operation
* High stability and simple electronic adjustment
* Selectable 0.1nT or 1nT resolution
* Non-volatile flash memory for 125k readings
* 1, 2 or 4 lines/m for single or dual version
* 1 to 8 readings/m on each line with automatic averaging or single shot
* Low power - 24 hour operation from one charge
* Survey and Scan modes with audio output
* Battery unit has built-in charger and field replaceable battery
* Battery fuel gauge
* Variable survey pace
* Variable scan threshold
* Simple download operation - 6.5 mins max
* Selectable output format
* Simple 6-key operation
* 50/60Hz powerline rejection
The gradiometer operates either in survey mode, where data is logged whilst
covering the site in parallel or zigzag paths, or in a scanning mode where
it is used as a search tool with an audible output without data logging. The
scanning mode is used to locate archaeological features, pipes, cables,
waste drums and unexploded ordnance.
page updated 4 November 2005
