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View Full Version : GPX 5000... Iron Handling??



Jim Hemmingway
03-27-2012, 07:13 PM
Can any GPX 5000 owners give me an idea how this unit deals with iron. For example... can you differentiate elongated iron...such as nails or spikes...from non-ferrous targets?

Appreciate any information with thanks. :)

Jim.

Steve Herschbach
03-28-2012, 05:35 AM
You can discriminate most shallow iron. Like stuff within 1/4 the overall detection depth. Deeper stuff, you dig until you get close enough for discrimination to kick in? In other words, it works least on deep targets where you need it most. But fairly effective on surface trash.

Jim Hemmingway
03-28-2012, 08:31 PM
Thanks Steve. I often wonder where we'd be if you weren't around to answer such questions. There is no local shop around here where I could see this unit.

Does it give a different tone for iron junk? Is there any loss of small non-ferrous targets ie small nuggets when using discrimination? Thanks...

Jim.

Steve Herschbach
03-29-2012, 06:05 AM
The circuit "blanks" on shallow ferrous targets. The Minelab discrimination system is notoriously unreliable, especially on specimen gold. See http://www.minelab.com/__files/f/22591/Instruction%20Manual%20GPX%204800-5000%20(4901-0096-2).pdf pages 72-74

That said it can be an aid in area full of surface trash.

Jim Hemmingway
03-29-2012, 07:01 PM
Thanks Steve.

Jim.