Sensitivity question

[aeromed73]

I have been metal detecting now for a little over a year and really enjoy it and the places I discover. One of the things I keep wondering about is while detecting if a straw blade of grass or pine straw contacts detector plate it pings in the 80's and will sometimes go absolutely nuts where I have to turn the detector off to make it stop. I've read everything I can find to troubleshoot but nothing like it is mentioned. Any ideas or is this normal?

 

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[Treasure_Hunter]

It is normal, if you lower your sensitivity it will clear up a lot but remember lowering sensitivity also lowers the depth you get.

 

[Loco-Digger]

yes it is normal, it is what we call falsing, if you do as TH says it should resolve the issue.

 

[Charlie P. (NY)]

If you take a detector outdoors where it is silent and hold it out horizontal and tap the coil with your hand (firmly but not a slap - no jewelry on your hand or arm) it should not beep.

Sometimes windings in the coil are not right and it will give false readings when bumped. I think they call that a "microphonic" coil fault.

 

[pa-dirt_nc-sand]

I used an Ace250 for a couple years and what you are describing would happen if I was near some kind of electrical interference. Could be visible overhead lines or buried or invisible dog fence. The A250 would also give a beep if you bumped the coil into something, but not go crazy like you are describing, this happened with electrical interference.

 

[Diggin-N-Dumps]

Make sure the connections are tight too...Ive seen it before where it goes nuts and the coil connection was loose.

Good luck!

 

[A2coins]

Good info

 

[Professor of Engineering]

IMHO:

Check the following: Coil connection at the control box, coil scuff cover for dirt...etc. and firmly secure your coil wire. I run my coil wires 12" - 15" straight up the shaft securing with velcro every 6" - 8", then wrap to the coil box. I hope you do not have a bad coil.

GL & HH