CZ-21 ground balance question.

[Greg (E.Tn)]

When diving w/ the CZ-21, how do you ground balance it--do you GB it on land adjacent to the dive site, or GB it underwater on the bottom?

 

[scubadetector]

I have the sensitivity at 5 and the volume at 10 most all the time. IF I get too many false signals I drop the sensitivity down a bit. BUT I like it as high as possible. I ignore one way beeps. I hope this helps.

Bob

 

[Greg (E.Tn)]

I've wondered about this a lot, especially where fresh water sites are concerned, because the mineralization is generally in the soil, not the bedrock, especially if the bedrock is limestone.

So, what you are saying is, set the ground to 10, sens at around 5, and go from there.....

My CZ-21 has a red circle around the "5" setting on the sens, and a blue circle around the "7"

I always thought the red circles were for "presets" or "set and go" settings, but the blue circle around the 7 is new to me.

Do you have any idea what that's about?

Thanks in advance.

Greg

 

[Greg (E.Tn)]

I took my CZ21 today to a river where people float the river in tubes, and lose stuff in the faster water. After about an hour in ankle deep water, I noticed that the detector was acting like EMI was interfering with it--random chattering, overly sensitive coil, etc. Changes in sensitivity had no effect on it.

I passed my wristwatch under the coil, and go no signal in autotune or any other setting for that matter.

I turned the machine off, then on, and got the standard startup sound--did the battery check, and got a steady tone, but a little weak.

The machine still wouldn't read metal.

So I shut her off, and took her back to the car and locked her up.

A couple of hours later, I was showing my digging buddy what the machine was doing, and it was working fine.

I replaced the batteries, thinking low batteries might be the culprit, and noted that the audio was louder, and the battery check much louder.

I'm hoping it was a simple battery problem, but I'm afraid the real problem might be a short in the coil cable, or worse yet, the coil being out of calibration.


Any input would be greatly appreciated.

Thanks in advance.

 

[scubadetector]

a problem. If not it could have been low batteries BUT I suspect water in it. If you kept it in a hot car it evaproated. JUST a guess though. I have had a few problems with my machines BUT I never had that happen. Bob

 

[mudpuppy]

Thats what happened to mine Greg...I think its water in the brains, but its going back to the factory, so I will know for certain...i actually dropped a nickle in the water to test my unit...never did find that nickle!

 

[Greg (E.Tn)]

After replacing the batteries the detector initially worked OK, then later when I tested it again it was malfunctioning----UNTIL I moved the search coil a little, and this suddenly made it work again.

So I figure the culprit is probably a short in the coil cable.

So, it's off to Fisher again.