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Re: Auto sensitivity or manual???
Posted by: EtracTom-AdirondacksNY
Date: October 01, 2018 03:57PM
Set your AUTO to +3 and that is the highest it will let it run in auto and be smooth by looking at the ground and comparing the average of the 3 bins/channels. low med high.

So if you see like 21 showing that is the best of the 3 compared bins/channels average where the machine wants to run and still be smooth.

It's not 21 and then +3 making it 24. It's 21 sensitivity only. Back it down to just 0 on AUTO no +, no - , just 0 and sweep some for a bit and the number will be lower as that is the sensitivity the machine averages see's from comparing the 3 bins. +1 will be more and + 2 will be even more and +3 will be the best and highest sensitivity. If you go Auto -1 ,-2,-3 it keeps lowering the sensitivity down even more I don't recommend ever using this settings at least not in my area never had to do it.

Manual it don't average it sets all 3 bins to that same level and runs there forcing them to all run hotter despite what the machine see's.

I usually pretty much run Auto+3 Trash High so it signals on good targets near trash supposed to help it ignore the trash and Ground DIFFICULT. My ground here is like almost 90 on other machines when ground balancing is done.
They also found if you didn't do ground difficult it didn't hit large silver some kind of glitch or snafu with the machine someone discovered. Wether that is still true or got fixed don't know. I got my Etrac early on after they came out.

The Auto + numbers aren't frequencies and have nothing to do with that. If you go to manual and get a better reading it may be that the object is deep and at that depth in YOUR soil where AUTO +3 is pushing the limits of it's capabilities.

If I hit really deep coins almost maxing out the depth gauge all my machine does is make a thunk sound in AUTO+3 was a deep 11"indian head. Good numbers if I remember right but only a tunk tunk as I swept over it.

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Re: Auto sensitivity or manual???
Posted by: WV62
Date: October 02, 2018 07:29PM
Thanks E-Trac Tom, some pretty good nuggets of information in your post.
I tested mine with the different ground settings and big silver, it hit well on both settings.
I was hunting today and I got a bit of high tone and then the thunk, I remembered your post and pushed the grass down and got a little better high tone. I dug the target and it turned out to be 1919 wheat penny at about 8" with the 5" Sunray coil.

Ron in WV



Worked and lived in the Huntington West Virginia area all my life, retired 2010
US Air Force Vietnam Veteran (68-69 & 70-71)
Started getting into metal detecting around 1975

Re: Auto sensitivity or manual???
Posted by: 5900_XL-1
Date: October 02, 2018 07:50PM
I was tutored in FBS by a stellar Explorer veteran, and running manual was pressed as needed. I trust manual, had lots of fun in manual. Changed my detecting world.

Re: Auto sensitivity or manual???
Posted by: floodplaindetector
Date: October 03, 2018 07:46AM
I was able to try Greg's method below last weekend and it resulted in a very deep silver coin. I had my NEL Thunder coil.
I was running Auto +3 at a site where I had pulled a couple halves and a few silver dimes this year. My sensitivity in auto was running at 22.
I bumped up the sensitivity to 25 manual and hit a repeatable signal that was close to burying the depth gauge. It didn't even sound like a coin but more like a real deep piece of thick wire or piece
of brass that I will sometimes chase so I wasn't real excited about digging it but I did.
I switched back to Auto +3 and swept the signal. I could still just barely hear it but the signal was very hollow and I probably wouldn't have dug that one. In the Manual 25 it was more of a solid signal in this case.
Out popped a 1923 D mercury dime at a measured 11.5 inches.
I Got to thank Greg for that one!

Dave



Quote
cz70pro
One thing I often do is see where my sensitivity will be running in Auto +3. Say it is 19, I will then switch it to manual and run it a couple numbers higher at 21 or so as long as the threshold is relatively stable and not nulling out too badly. If it will not run stable, I will at least run it in manual at the same number as Auto +3. I have tested it and it goes deeper in MY conditions running in manual even if it is at the same number as it was running in Auto.

One other thing, high sensitivity is, of course, not the only thing that will cause the threshold to null out. Iron will obviously cause that as well. If you are having a nulling problem switch over to a completely open screen wide open and see how much iron is in the ground. If there is a lot, I would run in Auto, switch to 2 tone ferrous and slow way down or better yet switch to a smaller coil. That way you can pick items out between the iron. The E-Trac is actually quite good at that. You just have to swing slow.

Another thing I do if I get an iffy signal in Auto +3, I will switch over to manual and check the signal with that. Often times, the signal will become clearer and/or stronger. There's my 3 cents! lol Greg


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Re: Auto sensitivity or manual???
Posted by: Southwind
Date: October 03, 2018 08:29AM
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It's not 21 and then +3 making it 24. It's 21 sensitivity only.

Um... doesn't seem right. So you're saying my 22 auto is as hot as 25 manual? I get the same depth, air test, using 22 +3 auto as I get using 25 manual? Actually I'd even go as far to say better depth because 22 in auto +3 sounds better than manual 25.



The real treasure is in the hunt...

Re: Auto sensitivity or manual???
Posted by: cz70pro
Date: October 03, 2018 02:13PM
Thanks Dave. That made my day! Glad my 3 cents turned into a dime for you. LOL Greg


Quote
floodplaindetector
I was able to try Greg's method below last weekend and it resulted in a very deep silver coin. I had my NEL Thunder coil.
I was running Auto +3 at a site where I had pulled a couple halves and a few silver dimes this year. My sensitivity in auto was running at 22.
I bumped up the sensitivity to 25 manual and hit a repeatable signal that was close to burying the depth gauge. It didn't even sound like a coin but more like a real deep piece of thick wire or piece
of brass that I will sometimes chase so I wasn't real excited about digging it but I did.
I switched back to Auto +3 and swept the signal. I could still just barely hear it but the signal was very hollow and I probably wouldn't have dug that one. In the Manual 25 it was more of a solid signal in this case.
Out popped a 1923 D mercury dime at a measured 11.5 inches.
I Got to thank Greg for that one!

Dave




One thing I often do is see where my sensitivity will be running in Auto +3. Say it is 19, I will then switch it to manual and run it a couple numbers higher at 21 or so as long as the threshold is relatively stable and not nulling out too badly. If it will not run stable, I will at least run it in manual at the same number as Auto +3. I have tested it and it goes deeper in MY conditions running in manual even if it is at the same number as it was running in Auto.

One other thing, high sensitivity is, of course, not the only thing that will cause the threshold to null out. Iron will obviously cause that as well. If you are having a nulling problem switch over to a completely open screen wide open and see how much iron is in the ground. If there is a lot, I would run in Auto, switch to 2 tone ferrous and slow way down or better yet switch to a smaller coil. That way you can pick items out between the iron. The E-Trac is actually quite good at that. You just have to swing slow.

Another thing I do if I get an iffy signal in Auto +3, I will switch over to manual and check the signal with that. Often times, the signal will become clearer and/or stronger. There's my 3 cents! lol Greg


Re: Auto sensitivity or manual???
Posted by: EtracTom-AdirondacksNY
Date: October 03, 2018 03:18PM
No, 22 at +3 Auto is where the machine wants to run the best of it's ability and still be smooth from what it see's .

25 manual is like 3 or more steps hotter sensitivity wise.

Say plain AUTO is showing 19 after a bit of sweeping to get it to settle in and you bump it up those +3 more in Auto it is probably right around 22 or 23 sensitivity wise reading on the screen.

Manual is more as it makes the 3 channel bins run all the same at full capacity.

In Auto the 3 channel bins run different amounts as one is low, one is medium, and one is high. The machine runs at the average of those 3.
Manual runs all three at full. Should be hotter or maybe a bit deeper. Notice he only went a couple more numbers higher at 25 in manual than the 22-23 it ran in Auto. Anymore and the machine starts to become sparky and runs slightly unstable depending on your ground and EMI in the area and starts to give not so good readings anymore.

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Re: Auto sensitivity or manual???
Posted by: WV62
Date: October 05, 2018 12:39PM
Just finished doing a air test on manual sensitivity starting at 30 and backing down by one to sensitivity 10. This time I had the 11" coil on the stick and used a silver dime for the test. Nothing magic here but it does give some idea of the sensitivity break point settings.

Ron in WV




Re: Auto sensitivity or manual???
Posted by: IDXMonster
Date: October 05, 2018 08:40PM
Quote
WV62
Just finished doing a air test on manual sensitivity starting at 30 and backing down by one to sensitivity 10. This time I had the 11" coil on the stick and used a silver dime for the test. Nothing magic here but it does give some idea of the sensitivity break point settings.

Ron in WV

Thanks for the effort Ron! This is exactly why I don’t like going below Manual 18 on my Explorer2,the performance starts to fade out of range of where I expect to find older coins around here. I think this is another exclamation point on the fact that other factors really do come into play depending on where you are,with bad ground,EMI(which is my personal WORST enemy),etc. But having a starting point with SOME expectation of performance is good! Well done...

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