3D

[KurtB]

How do you know if you have a properly tuned 3D and if it's not how do you get it tuned?

Thanks for any replies.

 

[AllenOK]

When hunting in Auto-tune, I'll start getting small, faint, positive and/or negative hits that are in time with small bumps and humps in the dirt as I swing the coil over the ground. When I start hearing that, it's time to GB. I only know of one place here where the ground changes that fast, and that's because part of the area is fill dirt.

HH from Allen in OK

 

[Dan-Pa.]

Allen gives some good insight and might add rule of thumb if you can raise your sens. to 4 and are able to ground balance your unit with no problems with decent depth you are good to go..CZ coils unlike some manufactures rarely go bad and units come from the factory properly tuned only Fisher has the instruments to properly tune..In addendum as the CZ3D is a fairly new unit doubt if it is out of tune and if it seems to be working good while fix what ain't broke..

 

[WVAdirtdigger]

I know I know air testing is not real world conditions for a detector but it will give you a baseline to let you know that it probably is OK. I discussed this with a CZ tech a few years ago when I thought I had problems with my 3D.

Here's how to air test it. GB-5, Sens 5 0r above volume 4 or above. Disc -0 You want to hear all the ID sounds.

Take a box turn it over and use the bottom as your top. Measure down from the "top" and make 5,6,7,8,9,10,11" marks. Now take a knife and cut slits at each of those marks parallel with the top of the box. Use a copper penny (pre 1982) and put it in the slots. Pass your coil along the top of the box so that the coin is under the center of it. About half of of your coil will be hanging over the edge of the box. You should be able to hit the coin down to at lest 9" and probably at 10. The factory for the 3D is 9.5 to 10.5". Since the 3D is fashioned from the CZ-5, I imagine these numbers would be the same. Don't do this in your house. Your box should be at least 2 feet from the ground and 10 feet from any metal object. Be careful not to do it around power lines also.

Any soil between your coil and a coin will impede the signal and reduce your ability to detect a coin, so air testing is the max your machine will do. I know this flies in the face of the stuff you read on message boards.

I spent some time on the phone with the Fisher techs to learn this.

Dave

 

[KurtB]

n/t

 

[mtdoramike]

n/t