F75 depth reading

[Detectojer]

The depth reading on my F75 seems to be off by quite a bit. If i get a target that says it's down 5 inch's and when i dig it up it's only down 2 inches. I have tested it by rubbing the coil right on the ground to get a more accurate reading and it comes out the same. No matter what depth the coin is the reading is all was way off. Is the problem with the detector or are all the F75's the same. I don't expect it to be right on but being off by 3 inch's in not acceptable.

 

[WV62]

I have had 4 F75's and all have been off, this last one I sent it in for upgrade and I ask them to take a look at that problem and they did adjust it some better. Mine will now say 5" on a coin that is 3".

So I am off by about 2" and I just live with that.

Ron in WV

 

[jim tn]

I am on my 3rd F 75 and all have been off on 5" and deeper targets by a couple of inches. It does help some to get good precise pin points. It is what it is and like Ron, I live with it. It does so much other stuff so well. HH jim tn

 

[James/Washington]

I do not use the depth or pinpoint features. Experience with the F75 is all that is really needed.

 

[sprchng]

Same here , with 2 different machines , one of which is tuned by TomD.
The most aggravating thing about it is that in numerous conversations with First Texas technicians and repair people they will not just say that it's off but continuously try to walk around the issue. I can accept that "it's in the software" but I don't care for them inferring I don't know how to pinpoint or read numbers

 

[Elton]

One of the very few shortfalls of most 75 series detectors. If you hit dead centerish under the mark on the coil it can improve the depth reading a little towards the accuracy side.

 

[REVIER]

The F2 is notorious for getting shallow readings wrong, hovering about 2" above the ground gives a much more accurate number on targets up to 3" or so but after that it seems to work well up to about 8".

Now my F70 is dead on all targets shallow and deep, I am shocked at how good it is on every deep coin or ring shaped target I have ever dug at 5"+.
I have found plenty at 6", many at 7-8", a few at the 8-9" level, a few junk items like beaver tail tabs at 10" and even a couple of targets from 12 up to one at 15" and it was no more than 1/2" off on all of them.
It has never been wrong in both good soil and bad...so far.
Since the core programming and engine is the same on these two I assume the extra programming and processes the flagship has is to blame.
I had no idea these things were off this much at all, never heard of this problem until I saw this thread.

 

[WV62]

The best way for me think about is if is coin or a target about the same as a coin, is it is not more than the depth ID number.

The step depth gauge on the front gives good enough depth info.

Ron in WV

 

[still looking 52]

My f5 is accurate on depth readings but the highest depth reading is 10". If the target is deeper than than, audio is gone and so is pinpointing. Also I've learned to use the depth reading as a guide when checking for targets for example if the coin reads 4" and if I don't find the coin within say the 6" range I pretty much know it's not a coin and is a larger target down deeper, saves a lot of unnecessary digging and time.

 

[jim tn]

Yep! HH jim tn

 

[mikey48]

My F75 is off, reads 1 in. on surface coins and about 2 in. off on deeper coins. I always assumed it was the coil because I'm using a nel 6x10 instead of stock coil.
There is no adjustment, so I always assume the coil is shallower than the reading. It does find deep stuff.

 

[NCtoad]

Also I've learned to use the depth reading as a guide when checking for targets for example if the coin reads 4" and if I don't find the coin within say the 6" range I pretty much know it's not a coin and is a larger target down deeper, saves a lot of unnecessary digging and time.

I've learned this on my F70 also. I'm pretty much guaranteed something's down there, but it's not that silver coin I'm hoping for.

 

[indy durtdigger]

Like some of the other peeps mine is dependent on the coil. The stock coil reads two to three inches too deep, the 5 inch coil is almost always dead on no matter what the target ends up being, and the fifteen inch that I added just before the weather went sour on me the pinpoint is only useful to make sure I'm centered on the target.

 

[UtahRich]

Just a thought here. Not saying that this is the issue above, but a related problem some might be having.

i've had problems when pinpointing and trying to get a depth reading of being too quick on the pinpoint button. What I mean is that I am slowly moving the coil in normal discriminate search mode back and forth over the prospective target and then I switch over to pinpoint with part of my coil still over the target, effectively 'detuning' the detector before I even get that first depth reading at full pinpoint level. This gives me an inaccurate, deeper reading on the target. Similar can happen if you are hunting a trashy site and there are adjacent targets to what you want to pinpoint. With most detectors, IF you switch over to pinpoint, with your coil over any target, seen or unseen, you have just detuned it. The depth reading won't be accurate.


Rich (Utah)

 

[jim tn]

You are so right, Rich! Poor or quick pin pointing has a lot to do with in-accurate depth readings. HH jim tn

 

[rod-pa]

I have found that nice round targets like coins and buttons give me a more accurate depth reading compared to odd shaped, or mangled items.

 

[markg]

I think the depth reading is an across the board attribute of the F75, I've had 4 and each did the same. Never thought it was problem though. Many other machines "different manufacturers" act the same way. So many factors can contribute to the different readings.
All and all I'm very happy with my F75 LTD.