Standard Test Results

[IBGold]

 OK here are some standard test results with the Standard Titanium Test pieces and some of my standard test pieces with the detectors I had on hand and thanks to a mate who loaned me his TDI PRO.
Sorry all machines were using the same 8" Minelab  Mono coil.

Regards, Ian.                                                    

[Mechanic]

G'day Ian,

What size coil did you use?

Cheers Mick

[IBGold]

Sorry Mick see above I have eddited it.

Regards, Ian.

[WM6]

OK here are some standard test results with the Standard Titanium Test pieces and some of my standard test pieces with the detectors I had on hand and thanks to a mate who loaned me his TDI PRO.
Sorry all machines were using the same 8" Minelab  Mono coil.

Regards, Ian.                                                    

Great! Very interesting test. Thank you Ian.

Is there any possibilities to do the sam with Garrett Infinium (if possible with 8" Infinium LS mono) included in test?

Which type of titanium alloy do you use? Presume this is air test?

[Razorback]

Hi Ian

Interesting results. However the 8" Minelab coil is purpose built for the Minelab machines. While it will work on the TDI it is less than ideal. I would like to see the results of a similar test with the TDI also using a purpose built coil of the same size as this would be a less biased test.

Regards
Brian

[IBGold]

Hi Jason,

Not biased the TDI is borrowed  and the coil used was used as it was what I had and was supposed to be the most sensitive standard Minelab coil that I Have on hand I have just done the tests again with a Standard 11" Minelab Mono and these results show a great improvement for the TDI but I have not got a comparable standard TDI coil that is why I used what I had likewise I have not shown the tests using my own coils as others don't have access those coils for testing so it is immaterial I can send you the 11" tests personally if you want the idea of test samples was for testing machines capabilities not coils although that is what I wanted the standard test samples for, I am sorry that I do not have any of the Titanium standard test samples left that I can send you then you could have posted some test results.

Regards, Ian.

[IBGold]

Doug,

I received the Standard Alum Test Sample today Thank You.

Regards, Ian.

[Doug]

Hi Jason,

Not biased the TDI is borrowed  and the coil used was used as it was what I had and was supposed to be the most sensitive standard Minelab coil that I Have on hand I have just done the tests again with a Standard 11" Minelab Mono and these results show a great improvement for the TDI but I have not got a comparable standard TDI coil that is why I used what I had likewise I have not shown the tests using my own coils as others don't have access those coils for testing so it is immaterial I can send you the 11" tests personally if you want the idea of test samples was for testing machines capabilities not coils although that is what I wanted the standard test samples for, I am sorry that I do not have any of the Titanium standard test samples left that I can send you then you could have posted some test results.

Regards, Ian.

The 11" std ML mono seems to go well on my gs5b as well, particularly on higher conductivity targets?
doug

[IBGold]

Hi Doug, the Titanium 1 and 2 gram targets on the TDI were out in front of all the machines.

Regards, Ian.

[Mechanic]

Hi Guys,

Well I spent some time today while I was out bush and did the tests with all of my coils with different timings.

All of the tests were air tests with the coil on the ground and the target waved over the coil. At some stage I would like to repeat the tests with the targets in the ground to see the difference. The distance was recorded where there was a definite response not for a faint response.

Cheers Mick

[authere]

Hi Mick,

We test our depths with our test nugget every time we detect as every spot you go to gives a different  depth to the test piece.

Then on top of that different weather patterns play a role in what depths we get, prooven many a time!!, so to be really fair to yourself with depth testing be very wary of the weather you were in ,the dampness of the ground and how much direct sun has been on your test area and for how long.

A point to note would be to try detecting at night and notice the difference on sunbaked ground

The best test piece size for myself is around the .3gr size as this is very smallish and this gives the most noticable depth difference on a given day compared to a 1gr test piece which doesn't fluctuate very much.

Bugger!!!!, the missus keeps ringing me lotto!....3 already this mourning

Where was i ,Mick,the good part of what you have done with every coil in your bag is that you know that on a given day you should be able to expect certain depths from your armoury and should any conditions be changed to expect a little different.

Regards Ron

[Prospector_Al]

Hi Guys,

Well I spent some time today while I was out bush and did the tests with all of my coils with different timings.

All of the tests were air tests with the coil on the ground and the target waved over the coil. At some stage I would like to repeat the tests with the targets in the ground to see the difference. The distance was recorded where there was a definite response not for a faint response.

Cheers Mick

Hi Mick,

I did some comparison between the different targets I have to determine if
high conductivity results in lower output.  My tests indicate quite the opposite.

The areas of the targets were calculated to eliminate the effect of the size
difference.  The "Standard Al Block" was used as the reference.

TARGET       AREA IN SQ.   SIGNAL IN V  NORMALIZED SIGNAL  AS FRACTION OF AL BLK SIG.

AL BLK       8.0                   2.2               2.2                          1.0         

TI 6AL4V     12.6                  2.8              2.0                         0.9

MICK'S TI    5.6                      0.9              1.4                         O.3

FE BLK        8.0                      0.5              0.5                         0.2

These results indicate that the Al Block and the Ti Alloy block yield about the same
output, despite the large difference in their conductivity.

Your Ti Block yields a lower than expected output, but that may be because it's
rather thin.

The Fe block yields a low output because the Ferrous and Non-Ferrous responses have
opposite polarity and only the difference between them is output.

These measurements were made with an 18" coil at 4.5" distance so the signal would be large enough with out demodulation.

It would be interesting to see what kind of a comparison you get between the Ti Alloy
target and the Standard Al Block,

Best Regards,

Allan

[Tinkerer]

IBgold's Titanium test standard target pieces have arrived.
Many thanks.

I have no ready detector at hand, but I couldn't wait so I made a quick and dirty test.

1gram 20cm

Large piece 54grams  80cm.

These tests were made with a makeshift coil assembly lying on the floor that contains steel reinforcing bars, inside the house. The mains noise is high so the signal response had to be above 50mV to be recognized.

I also tried adding my 6 pound cast iron cannon ball on the coil to simulate hot ground (without making any GB or tuning adjustments) and the detecting distance stayed the same.

I have not received yet Allan's Titanium sample, mail is so slow, so I am curious to compare the results.

I am setting up a test platform where I can measure the TC's of the targets, so that we get some information on the TC's of the Standard Test Targets to give us some more information to compare with.

Tinkerer

[Tinkerer]

I was tinkering with a new coil today, so I took advantage of running Ian's and Allan's Titanium test standards across the coil.

First I have to admit that I made the mistake of cutting Allan's Titanium disk in half to make it the same size as Ian's. It was so big that I could not find room in the house to test the full range.

Cut a bit smaller than half it presents nearly the same surface to the coil. I intend to trim it to exactly the same surface, but have not done it yet.

As is, I get about the same distance of 120cm from both. About 50mV signal with 30mV noise.  The noise is mostly 60Hz  with the large, ancient  freezer rattling away at about 1m from the coil.

These are definitely not ideal conditions, with steel reinforced concrete ceiling and floor and steel shelves to the one side of the coil and the alluminum box of the freezer on the other side. I expect the detecting distance to improve considerably outside.

Tinkerer

[Zed Troy]

G`day Tinkerer

So your saying the distance is 1.2 meters or 1200 mm with a 50 mv signal,may i ask where are you measuring this signal and if it is after a preamp then what is the total gain that your using ?

Zed

[Tinkerer]

G`day Tinkerer

So your saying the distance is 1.2 meters or 1200 mm with a 50 mv signal,may i ask where are you measuring this signal and if it is after a preamp then what is the total gain that your using ?

Zed

Hi Zed,

OK for the distance.
for the signal amplitude, the signal is amplified, integrated, filtered and analog processed. The total gain is relatively low, but honestly, I do not know how to accurately calculate the gain through the signal chain.
The 50mv signal amplitude only has a significance when compared with the noise amplitude 30mV, or S/N of 1.66, due to the very high 60Hz environmental noise.
Still, I am quite happy with the result, most detectors would not work at all in the same environment.

All the best

Tinkerer

[Tinkerer]

Since I give Allan's (half) and Ian's large Titanium plate detection depth, I should probably also add Ian's 1 Gram Titanium standard test sample detecting distance with the same coil.

1 Gram = 35cm from the center of the coil.

All tests are air tests, done in dynamic mode, that is, the target swinging above the coil on a string, hanging from the ceiling. The swing or sweep speed varies with the weight of the target and the length of the wire.

Can someone supply the formula for calculating the swing speed at the lowest part of the arc?

Tinkerer

[WM6]

 I should probably also add Ian's 1 Gram Titanium standard test sample detecting distance with the same coil.

What shape is Ian's Titanium 1 Gram standard test sample? Is it nugget like or post mark like?

[Tinkerer]

 I should probably also add Ian's 1 Gram Titanium standard test sample detecting distance with the same coil.

What shape is Ian's Titanium 1 Gram standard test sample? Is it nugget like or post mark like?

The 1gr Titanium test target is 6.5mm x 12.8mm x 3.18mm. since Titanium is much lighter than gold, it would represent a gold nugget of several grams.

My 1gr gold bar has about 2 times the surface area since it is quite thin. It detects at about the same distance.

Tinkerer

[IBGold]

Hi Tinkerer,

What size coil is it I will redo the tests with an 18" minelab mono except for the TDI as I do not have that here now.

Regards, Ian.