Standard for testing metal detectors

[Tinkerer]

Extended decay time.

Still tinkering. Trying to define results on a non linear preamp, I am faced with the following problem.
All decay times seem to be extended. For example, my 0.6 gram test gold nugget still gives a considerable signal after 100uS. Since this is the longest delay reading, this cuts down considerably in the amplitude of the difference between the first sample, taken at 8uS and the last sample taken at 100uS.

I don’t know if this will be of any use, but it is intriguing.

The other problem I have in the testing procedure, is the lack of a standard to compare with.
Has anybody posted something like a testing standard in the past? What I mean to say, I have a few coins of different size and metals, steel washers and such that I use for testing.
The smallest test piece is a 0.6 gram gold nugget.
Probably the most common test samples in the USA would be the 1c, 5c, 10c, 25c US coins, whereby one has to watch for the dates, since the metal has often changed over the years.
However, European or Australian coinage is very different, even cool drink cans are different, so we don’t seem to have a standard that lets us compare the sensitivity of our metal detectors.

Any good ideas out there?

Tinkerer

[chemelec]

Has anybody posted something like a testing standard in the past? What I mean to say, I have a few coins of different size and metals, steel washers and such that I use for testing.
The smallest test piece is a 0.6 gram gold nugget.
Probably the most common test samples in the USA would be the 1c, 5c, 10c, 25c US coins, whereby one has to watch for the dates, since the metal has often changed over the years.
However, European or Australian coinage is very different, even cool drink cans are different, so we don’t seem to have a standard that lets us compare the sensitivity of our metal detectors.

Any good ideas out there?

Tinkerer

A Gold Nugget is also Not a good standard because the actual gold content can vary considerably from one to the next.

I Might suggest you get some US or Canadian Coins of Known Content.
Even over where you are, they shouldn't be too difficult to get from tourists.

For about $600.00 you can buy a 1 ounce Gold bar or for $20,000.00 a 1 KiloGram Bar. Both make a good standard. I Did, **SMILE**
A Good Investment also.

Take care......Gary

[Tinkerer]

Testing standard

Hi Chemelec,
please send me 12 of the large ones as well as 12 of the small ones, so that I can bury them in my back yard to set up a testing field. I will leave them buried for a few years, since people say that the gold that is buried for many years gives a stronger response.
When I am finished with them, I will send them back if you send me postage money.
Please also send a stack of about 4" of 100$ bills so I can test my detector as to what distance it picks it up.

Tinkerer

[chemelec]

Hi Chemelec,
please send me 12 of the large ones as well as 12 of the small ones, so that I can bury them in my back yard to set up a testing field. I will leave them buried for a few years, since people say that the gold that is buried for many years gives a stronger response.
When I am finished with them, I will send them back if you send me postage money.
Please also send a stack of about 4" of 100$ bills so I can test my detector as to what distance it picks it up.

Tinkerer

Sorry But INTERNATIONAL TRADE LAWS Don't allow for these Transfers. :mad:




Hopefully you can detect it on here, for a limited time.

[Tinkerer]

Testing standard

Hi Gary,

this is indeed a very nice set of testing samples. They can really set an international standard.

Could you please make some air tests for us?
Take te largest sample (what is its exact weight?) and run it across your different detector coils and give us the maximum distance it can be detected by each coil.
please also indicate the particulars of each coil, diameter, shielded/ unshielded, kind of winding and inductance etc.

After this test, please wrap several test samples individually, in plastic or paper, like somebody who would bury them would do.
Then place them together in a bag and repeat the tests above. Tell us the exact difference between the two tests.

On another subject:
I showed your photo to my Superduper long Range Gold Detector and it went crazy. Now I want to interface it with Google Earth, to see if I can detect the exact location of the hoard. Then it will be an easy thing to build a telekinetic atomic esotherizer to transport your test samples to my lab.

Thanks for the help

Tinkerer

[chemelec]

Hi Gary,

this is indeed a very nice set of testing samples. They can really set an international standard.

Could you please make some air tests for us?
Take te largest sample (what is its exact weight?) and run it across your different detector coils and give us the maximum distance it can be detected by each coil.
please also indicate the particulars of each coil, diameter, shielded/ unshielded, kind of winding and inductance etc.

After this test, please wrap several test samples individually, in plastic or paper, like somebody who would bury them would do.
Then place them together in a bag and repeat the tests above. Tell us the exact difference between the two tests.

On another subject:
I showed your photo to my Superduper long Range Gold Detector and it went crazy. Now I want to interface it with Google Earth, to see if I can detect the exact location of the hoard. Then it will be an easy thing to build a telekinetic atomic esotherizer to transport your test samples to my lab.

Thanks for the help

Tinkerer

Glad You Enjoyed it, and it is all Real.

Sorry, No time for those tests and now I have to send it back to where I got it, so the pictures are removed.

Definately Good Test samples, although my detector fails on the Money Test.

Take care......Gary