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Ground Probe Question
Posted by: Tony N (Michigan)
Date: November 23, 2017 09:21AM
In the links at the top of this page for information on the V3i Rob (IL) wrote:

"To get the phase of your target, put the coil on the ground away from the target and press the zero button - that captures the ground for separating its effects from the target."

Where is the "zero button" on the V3i?

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Re: Ground Probe Question
Posted by: Big Treble
Date: November 23, 2017 02:07PM
I believe he meant zoom

Re: Ground Probe Question
Posted by: Tony (Michigan)
Date: November 23, 2017 02:30PM
Quote
Big Treble
I believe he meant zoom
Maybe Zoom is the new Zero? LOL. Thanks Big Treble. Do you ever do a ground probe? And if so, do you do better adjusting the detector based on your probe?

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Re: Ground Probe Question
Posted by: Big Treble
Date: November 23, 2017 03:31PM
Actually I should but forget to, when I grab the V3i since over the last year I've used the Etrac quite a bit.

Honestly I'm not sure why either. Just today compared the AKA silver sucker Etrac, against my V3i, both with a U13 in a test garden and honestly the V hit harder and much more consistent on an 8 inch merc than the Etrac did.

Re: Ground Probe Question
Posted by: One arm willy
Date: November 23, 2017 08:33PM
When your on the ground probe screen. Zero is on bottom left. Hit enter.

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Re: Ground Probe Question
Posted by: wasp
Date: November 23, 2017 08:36PM
Hi Tony,

Find a spot of clean ground, hold the coil about waist high, highlight Ground Tracking on the live search screen, then tap the Zoom button and the Ground Probe screen pops up. The Zero button should already be selected (highlighted). Press enter to Zero the readings. Then place the coil on the ground to get the ground readings.

The Ground Probe can be useful for determining which filter to use and how high you can set the gain to avoid false signals. I use the Ground Probe when detecting an area new to me to give me a good starting point for sensitivity and filter settings.

Re: Ground Probe Question
Posted by: Tony (Michigan)
Date: November 24, 2017 07:21AM
Quote
wasp
Hi Tony,

Find a spot of clean ground, hold the coil about waist high, highlight Ground Tracking on the live search screen, then tap the Zoom button and the Ground Probe screen pops up. The Zero button should already be selected (highlighted). Press enter to Zero the readings. Then place the coil on the ground to get the ground readings.

The Ground Probe can be useful for determining which filter to use and how high you can set the gain to avoid false signals. I use the Ground Probe when detecting an area new to me to give me a good starting point for sensitivity and filter settings.

Okay, I took notes from what you wrote above to take into the field. But now my question: How do I set up the detector based on the readings?

Re: Ground Probe Question
Posted by: Tony (Michigan)
Date: November 24, 2017 07:24AM
Quote
Big Treble
Actually I should but forget to, when I grab the V3i since over the last year I've used the Etrac quite a bit.

Honestly I'm not sure why either. Just today compared the AKA silver sucker Etrac, against my V3i, both with a U13 in a test garden and honestly the V hit harder and much more consistent on an 8 inch merc than the Etrac did.

Yea, I too have an E-trac and my V3i hits harder on my deeply buried coins in my coin garden. However, for some strange reason, I have better hits with the 10" D2 coil on my deepies with my V3i than with my 13" ultimate. That doesn't make sense to me.

Re: Ground Probe Question
Posted by: 5900_XL-1
Date: November 24, 2017 11:33AM
Quote
Big Treble
Actually I should but forget to, when I grab the V3i since over the last year I've used the Etrac quite a bit.

Honestly I'm not sure why either. Just today compared the AKA silver sucker Etrac, against my V3i, both with a U13 in a test garden and honestly the V hit harder and much more consistent on an 8 inch merc than the Etrac did.

"and honestly the V hit harder and much more consistent on an 8 inch merc than the Etrac did."

I have owned two different V3i units since 2010, and in my personal experience with both V3i unit against the MLab(SE Pro and Etrac) once I went to Minelabs last year, is different than your results in depth and VDI. The Minelabs ROCK past 7 inches, whereas the V3i simply washed out in target ID. I can honestly say that my two V3i units only found a tiny handful of coins found past 7 inches depth.

I still own my last V3i unit, and continously compare/test signals in my home garden against my Minelab detects. My V3i just loses dependable tone and TID once the target passes 7 inches. It could all simply come down to specific deficient metal detector units. I suspect that lots of secondhand detectors being sold just didn't meet the users expectations.

I would keep that V3i you have now if it beats an Etrac in depth and ID.

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Re: Ground Probe Question
Posted by: wasp
Date: November 24, 2017 12:05PM
Tony,

It seems to help to set the RX gain to around 7 as a good starting point. Ground Balance then take the reading. The VDI numbers on the Ground Probe reading indicate how mineralized the soil is..... mid to low minus 90s indicates ferrous, around -90 more neutral, below -90 is nearing salt.

The Strength % readings help to determine if RX gain can be increased. Keeping the Strength below 10% helps avoid falsing and chatter from ground interference.

To see which filter is going to be best for this ground, find a target at around 6 or 7 inches that gives a good clear consistent signal. Reduce the RX until the signal breaks up and is barely detectable. Then cycle through the filters until you find the one that gives the strongest signal on that target.

Raise the RX back to where you had it and you should be set as far as eliminating ground interference. Memorize or write down the RX and filter settings for that area so you don't have to go through all the testing next time you're there.

If you are getting chatter from EMI you will have to make additional changes. (check the stickys)

Hope this helps.

Re: Ground Probe Question
Posted by: Tony (Michigan)
Date: November 24, 2017 05:08PM
Thanks wasp for that helpful information! Much appreciated!

Re: Ground Probe Question
Posted by: Tony (Michigan)
Date: November 24, 2017 05:16PM
I've had different Minelabs from the XS to the SE and SE Pro, E-trac and Muskateer. The SE and SE Pro barely hit my 9+ inch deep penny and dime.
My V3i not only hits them well, I can lift the coil (10" D2 coil) three inches above the ground and can still hit them and get a VDI.

I still have my Minelab Explorer XS, E-trac and Muskateer. The problem with the V3i is it can be easily set up wrong with all the myriad of setting.
With the E-trac, the settings are much simpler. I still like my E-trac.

I wonder why you are getting only 7" coins with your V3i. Is your soil really bad?

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