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Awesome. Pictures are always fun too, if it's not too much hassle.
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My White's Coinmaster 6000/D's transmit frequency is 6.597 KHZ. This measurement was made using inductive coupling at about 6-8" from the search coil. No matter what switch...mode...or anything changes the amplitude or frequency of this signal coming from the search coil. The signal is a rather beautiful sine wave with very little....if any distortion. Since my detector is limping or loping at threshold....I thought I would test & see if the amplitude was moving up or down in sync with the meter swing and audio out. Not the case....must be something else...
FlashComment
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Another series of measurements....Goldmaster Alaskan (White's)....21.225 KHZ....
White's Coinmaster 5000/D..... 5.093 KHZ
Micronta 4003 (Radio Shack)..... 13.857 KHZ.
Maybe this data should be posted somewhere in a "Technical Specs." thread....
Flash
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I was given a non-working White's 6000 D a couple weeks ago. Decided to take a look at it and found the snap on connector for the 9 Volt battery pack was bad. Also the Disc pot was froze and would not turn. Got all that fixed and tried it out. The air tests were impressive but not so much when I took it outside to the coin garden.
The depth isn't impressive (about 6 inches) but I was not able to get the ground balance set to a sweet spot. So I am sure with some tweaking, it will perform a lot better. Since I have not heard much about this machine I was not sure what to expect for performance.
Perhaps someone with some experience using this machine could tell a little about how it should perform.
JerryComment
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I just realized that White coined the phrase "Ground Exclusion Balance" and printed it all over their blue box detectors as "GEB" !Comment
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Would you mind telling us about the apparatus you used to couple to the coil? Is it a special combination probe for your scope or something you made?Comment
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Helmholtz
I use my frequency counter. I have accumulated several pieces of test equipment having been involved in the electronics field in one way or another. Presently an electronics instructor....23 years of service......retiring this July.
The coil....similar to an old degaussing coil used in the old days of color TV service. Place near your search coil...about 5 or 6 inches and observe the output by tying into the leads going to the degaussing coil with your scope or....frequency counter....or in my case....both. My coil is actually a Helmholtz coil used when I was teaching Physics and needed a uniform magnetic field to determine the mass of the electron. The degaussing coil is much easier for you guys to obtain. Even an old solenoid with the core removed may also work. Try some things....
Flash
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OK good I will definitely try a few things out. I think I have an old solenoid in the shed, or grab an old monitor. I may even wind something.
Congratulations your upcoming retirement, hope you enjoy the extra free time.Comment
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If you don't have a frequency counter....you should be able to use your O-scope to get close enough. Be sure your sweep is in the cal. mode.Originally posted by Pennypacker View Post
FlashComment
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ADDENDUM: Harbor Freights Model 67378 9-Function Metal Detector.......5.922 KHZ.Originally posted by Flash1940 View Post
FlashComment
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My White's 6000/D now has 11 new electrolytic caps. I used an LCR meter to measure the old ones.....they all had about the same or greater value as written on them. They may have had a little leakage.....anyway I think it helped a little. My next step will be to determine the correct pot adjustments and procedure. If any of you out there have an adjustment procedure....I surely would appreciate our contribution. Null adjustment for the coil is inside the coil. I'm not going in there if I can avoid it. Any input will be great for discussion. A true service manual would be quite helpful....but I'd bet getting one of these would likely be out of the question...!!!
Flash
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