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Re: PI with Fe discrimination
Hi Pepso,
I can't see anything that would enable it to discriminate against iron. The ELIM control just alters the sample delay which would enable it to reject small and lower conductivity non-ferrous targets.
Eric -
Re: PI with Fe discrimination
Really? I think it should reject small ferro targets...or I'm completely out? In a PI diagram (I see in a book), the ferro target has short response and higher conductivity target(silver...) has longer response. So the longer sample delay (receiving window)doesn't hit short response.
Sorry for my english.Comment
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Re: PI with Fe discrimination
Hi Pepso,
Most PI's have the control shown on your schematic, but none of them discriminate Fe to any useful extent. Iron objects certainly have a fast initial decay, but this is followed by a long tail which can extend to 100uS or more. Increasing the sample delay will give you less signal from a ferrous target, but you will completely lose many valuable lower conductivity items. Silver coins, depending on their size and thickness have long decays, and if you are just looking for these, you can reduce the response to all other items, but iron will still be there.
Eric.Comment
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Re: PI with Fe discrimination
Eric, I quote you: 'Iron objects certainly have a fast initial decay, but this is followed by a long tail which can extend to 100uS or more.'
Is this a typical characteristic of iron because of its ferro-magnetic nature or because of its higher resistivity than copper, gold or silver?Comment
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