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On 12/9/2024 at 10:41 AM, EL NINO77 said:

Nexus 3D test ...can be for example ... an example for standardizing 3D testing... which is not a bad idea... because it allows you to change the position of iron as well as coins precisely...
I always nod positively to some step with a measure towards standardizing such testing...

One problem I repeatedly see with testing is a lack of control over the coil sweep. In a lot of the Monte nail board videos people use very short fast sweeps to show that a particular detector excels in that test. But detectorists normally use a broad sweep at about 1m/s, at least until they get an initial hit. So these tests need to show that a detector can recover/unmask using a standard hunt sweep.

For my own testing, I built a simple wood jig using 2x4s:

image.thumb.png.fdb5e7b7a798194a3f618b188d231a80.png

The coil is laid on the top 2x4 and swept between the 1m marks using a metronome (phone app) set to 1s to cue the sweep reversals. There are 2 tiers for placing coins and nails at 3" and 6" which gives precise control over depth. 9" and 12" tiers would be easy to add. Grooves are cut for the nail spacing and a center recess is cut for the coin.

In this manner you can space the nails out and bring them in 1/2" at a time to determine where the detector loses the ability to clearly separate the targets. You can even place the Monte nail board on a tier and test with it. Besides imposing more control on the testing, this thing is super cheap to make.

  • Like 9

Carl..greetings....I was just thinking of you today in connection with your new book "Inside the Metal Detector" which you just published...,,and which I bought with pleasure..
.Your test device is really well thought out, probably deserves standardization... I will definitely make such a device... because I consider it very well thought out... and yet simple to implement..

Regarding the Monte separation test... yes, many testers in the videos sweep over such a test with very short movements...over the position of the coin.....sweeping over the entire length of the Monte separation test card is correct..

But as for speed, I choose two types of movement speed..one normal medium slow movement - the one I use when detecting in iron-infested terrain and the other movement with the coil is such an optimal slow speed in order to maximize the separation of the given detector in such a test...
This test will teach you how fast you can sweep the coil, for example, in such a real situation ...to achieve the best separation results.. in such a detection style...

ATREX-12cmCCcoil.jpg.d427585c6ea68da0a52c18833d3c5099.jpg

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As for 3D depth separation tests... here the situation is similar
first it is tested at a slow standard speed,,,which is for comparison with other detectors and in the air test then at a speed that allows you to maximize the 3D separation results of the detector...in this second case it is about getting the most out of the detector under test...

Usually on such optimal detector settings from the 3D test I still test my test garden and try to unmask some new target...

 

 

  • Like 1

@Geotech  Carl,   Is this a new book or a revision?  Either way I would like to purchase a copy if available.

@Geotech  What is the best way to order it?

In Santa’s sack!  Thanks. I’m looking forward to reading it.

Carl, myslím si, že vaša najnovšia kniha poskytuje najrozsiahlejšie, najaktuálnejšie a podrobné informácie o tom, ako funguje technológia detekcie, vrátane multifrekvenčnej technológie...

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