The GPX-4000 metal detector first introduced a special ground balance mode called Specific Ground Balance which is still used in newer GPX detectors. This ground balance mode may allow the detector to ground balance in areas that otherwise would have too much ground noise. The Specific mode uses a special second-order ground balance algorithm that can deal with more complicated ground responses than the normal first order ground model.
If you ground balance in the normal way and the detector still displays ground noise then this may be a situation for Specific ground balance mode.
The ground balance process is slightly different to the way that you normally ground balance. If you are in new ground or it has been some time since you have used Specific ground balance mode it is best to ground balance using the Ground Balance switch on the front panel.
The ground balance process is slightly different when in Specific mode.
- Start with the coil in the air and the Ground Balance switch in the Fixed position.
- Change the switch to the Tracking position and hold the coil still in the air while the high pitched tone sounds.
- When the tone changes to a low pitch, start raising and lowering the coil in the normal way.
- When the ground noise ceases you can change the switch back to Fixed.
After this first ground balance then you can subsequently use the green Quick-Trak button in the normal way.
I would love to hear from people who have had experience with Specific ground balance mode. Please leave me a reply in the comment section below. Please note that you have to be a registered user in order to leave a comment. You can sign up from most pages or go to directly to http://www.minelab.com/members.
Phil Beck
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