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cz-5 ground balance

A

Anonymous

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<img src="/metal/html/frown.gif" border=0 width=15 height=15 alt=":("> When trying to initial ground balance at the point of getting a slight hum,at 10 on gb I get a slight hum which sounds more like static this stays until I get below 9 gb which it disappears.The best I can get is no hum and no increase when the coil is raise to 6-12 inches.Is this normal?
I also notice that if I grab the rod below the box where the cable is wrapped I get all kinds of harmonics.Is this normal? <img src="/metal/html/confused.gif" border=0 width=15 height=22 alt=":?">
 
sounds like a short in the coil wire at the conector. You might check the wire at the conector, try moving it around, with the unit turned on. Hope this helps. HH...BJ
 
May I ask how you are setting your controls up prior to attempting to do the ground balance? I think we first need to make sure you're doing it correctly.
 
I agree with Mike one wonders if your are ground balancing correctly..
 
Volume at 10,autotune on,sensitivity at 10,hold waist high and reduce sensitivity to hear humm or tone.At sensitivity at 10 I can barely hear a whirr with some static by the time I reduce the sentivity to 9 this whirr disappears.(I can not get a tone or humm with coil at waist high)I go to the bobbin method and get a tone increase as I raise the coil.I start reducing the ground balance until their is no sound when the coil is raised,which is usually around gb 6.I then reduce the sensitivity to 3,reduce the volume to 4.5 and disc. to 4 or 5.I have no humm or tonein my headphones!
The ground around here is highly mineralized with iron ore and this was a iron foundry town and a lot of yards have been filled in with pipeshop soil.I can run the cz-5 in yards with disc at #6,coins only and when I sweep it I get multipile hits,but most are not double bleeps.I can get initial double bleeps and then they will just disappear.
 
OK, I believe your method is the problem. You should not be "reducing" anything other than the ground balance control during the procedure. Take a look at the link below...it's a post I made about a year ago where I attempted to explain the bobbing method. Print it out, follow it to the letter, and see if it helps.
 
Yeah Mike I printed out your page and have read it plenty of times.I have tried it your way,but still don't have a tone when coil is waist high before I try bobbin!
 
You said "waist high"??? No place does anything say to raise the coil waist high. Here is an excerpt from the procedure:
<STRONG>raise and lower the coil from the ground to a height of about 6 inches (repeating in a steady up and down motion</STRONG>
If you are expecting to hear anything from waist high, it's not going to happen. Unless I'm missing something here, you really need to read the procedure again very carefully.
 
Page 11 step 2:Hold the search coil waist high away from any metal,this is from the turn on procedure.
Page 12 "the bobbin method"
step 1: set as in the "turn-on"procedure,making sure the disc control is at AUTOTUNE and the SENSITIVITY control is set so you can just barely hear a threshold hum.
All this is from the Fisher cz-5 quicksilver handbook.
Now I realize that you do not say this in your established procedure.Are you saying that I should have no hum or tone until I begin the bobbin method and then all I hear is the increase tone from 1-2 inches off ground to 6" off the ground and work with that tone only until there is barely a tone and then stop with barely a tone.This does contradict the Fisher handbook in that I should have a tone or humm at waist high!
Please don't understand me,I'm not trying to be short about this only that it is very confusing to me.
 
The manual is screwed up and makes little sense in this area. My method is the way that those of us who do this in a few seconds without even thinking about it have come to learn, and it works. Forget the book. Or at the very least, don't try to combine what the book says with my method.
Now, if you forget the book and do it totally by what I gave you, does it not work as stated? If not, then I would suggest setting it to 5 and going with that.
 
I don't know how it is that the book got it so bad, but that's been a complaint for a long time and the reason I was compelled to try to write something up that made a little more sense. I'm pretty sure it will work for you. Once you have it down it only takes about 30 seconds to do.
 
Jim,
Some CZ5's will start humming as sens 8 in autotune and others will be barely audible when set all the way up to 10. It really doesn't mater as long as you are able to hear the audio response during the bobbing procedure.
For your ground I suggest trying to set the GB a little positive. Keep turning the GB knob clockwise until you just start to get a response when lowering the coil during the bobbing procedure. I hope that helps on the falsing.
HH Tom
 
Perhaps your unit could be faulty, but I really feel somehere along the way you are goofing up. Actually feel the description was written by a tech. and wish Fisher would rewrite it as the user friendly CZ drives some new users wild..Actually ground balancing you are tuning the unit to the ground condition on hand...Here we go..put in autotune, volume and sensitivity at 10..ground balance knob at 5.Bob the unit from about a foot high.If it sounds off going towards the ground turn the knob counterclockwise a bit and if it sounds off going away from ground turn the balance knob clockwise. Idea is to get little or no sounding off either way and its properly ground balanced. A good way to practice is to put the balance knob at 10 and bob it and change the setting to 9-8-7 all the way to 1 and listen to the changes. Rather simple procedure once learned that should takes seconds at best with few bobs. I remember when I got my first CZ6 and read the manual and said HUH so I can undertand the question marks. Hope we are not beating a dead horse to death but remember we all had to learn.Don't wait to go into the field to ground balance just go in your back yard and practice and it will come giving you more depth and stability..Remember area must be free of large objects in the ground and yep even power lines above you will certainly goof you up. After balancing turn the sensitivity and volume to your preferences...remember you can go down, but if somewhere along the line you decide to go up after turning down the sensitivity you have to re-ground balance. As far as the other problem you may have a loose connection at the box connector or a poor contact and if taken to a Fisher dealer he could probably offer some expertise..Am sure a club member, Fisher dealer or just an experienced CZ user could set you straight very quickly..
 
Again Thanks Mike! I understand what to do to tweak the ground balance from what you told me.
 
Thank you Tom for speaking with me on the telephone.I was confusing the tone that the book says with the tone when bobbin.I believe that I am straight on this procedure now.
 
Tom and many learned individuals can surely help. One thing you missed is in the manual it states at volume of 10 you will hear a slight threshold and below 8 you won't hear any and that seemed to confuse you from initial post...I feel with a little practice a couple of bobs and you will be on your way.Do run the ground balance from 10 to 1 while bobbing one increment at a time and a light will go off in your head as to what your trying to accomplish..
 
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