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  1. #1

    Aug 2005
    12

    Resistivity machines...for real?

    Hi! I have been wondering if ground resistivity locators such as the MotherLoad Locator, Accumeter's locator, or the GPRs actually work as described. Does anyone have any actual experience with them or have the opinion of someone who does?

    As a follow up to this question, I had read on an archive of the Geotech forums that these devices are disgustingly overpriced and that a DIY kit from a EPE magazine article will build you the exact same thing.

    I am sorry if I missed a similar thread when looking, if this has already been covered in another thread, I would appreciate a link to the former thread.

    Thanks!

  2. #2
    us
    The Watcher

    Apr 2004
    Northern Nevada
    Dowsing Rods and a Ranger Tell Examiner
    9,286
    1062 times

    Re: Resistivity machines...for real?

    Hey Shava....Did you ever open up a can of worms. To the best of my knowledge the Mother Load and Accumeter are Long Range Locators. Earth Resistivity is a whole different subject. I have not used? ---- products so I can't say how good they work. I own 2 LRL's and they work for me but are not perfect. If they operate with the use of Dowsing Rods rods there is a few things you should check before you consider buying one. There is a little test at? http://www.#@!$%#@!.net/success.htm that will be helpful. Learning to Dowse without the use of a field generator was a break through for me.? I disagree with Carl on LRL's but agree that you can save a lot of $ by building you own Field Generator.....Art

  3. #3
    us
    Mar 2003
    Oregon & Texas
    Custom Designs and Prototypes
    1,573
    814 times
    All Types Of Treasure Hunting

    Re: Resistivity machines...for real?

    "Disgustingly overpriced" sums it up pretty well.

    The Mother Load Locator, Accumeter, and Kellyco GPL are all Earth resistivity meters (ERMs), not LRLs of the dowsing variety. ERMs "really work", and are very useful devices for some tasks, especially archaeological ground mapping. These particular 3 you mention, are what I call "Poor Man's ERMs" because they are terribly outdated* 2-probe designs that no serious archaeologist or treasure hunter would bother with, and for which a $50 bill and a trip to Radio Shack and Home Depot will pretty much get you everything you need to build one. Or, you can pay $1000's for someone else to build it.

    The EPE project is a far better true 4-probe design, and even has a much-needed data logger and mapping software, which the PoorMan-ERMs lack. And you can still build one for a heap less money, maybe as little as $100.

    - Carl

    *The "Survey Meter" project on Geotech is EXACTLY the same design. 1971 I believe.
    I believe it, therefore it is true.

  4. #4

    Aug 2005
    12

    Re: Resistivity machines...for real?

    Thanks for the feedback thus far. Carl, I think you are the person in the forum thread I was referring to!

    I actually have gone ahead and grabbed the 2003 back issues that cover the more up to date datalogging program and design. I read through the older item and was not 100% clear on a couple of things, if you wouldn't mind lending your expertise to a couple more questions on this subject...

    1) From the older article I grabbed while I wait on the back issues to arrive, if making them yourself is stainless steel the preferred material or is there a more preferred material to use?

    2) I am still not completely sure I understand how this arrangement works in terms of the current going through the rods and which rod is picking up interference from another? Is there any way this can be "dumbed down" so that I understand exactly how the rods are measuring the resistance that is coming from the rods themselves?

    Thanks for your patience with me by the way.


  5. #5

    Oct 2004
    290

    Re: Resistivity machines...for real?

    FWIW Just get the articles written by John Becker. I have built many of the projects
    he puts in the magazine and found them all to work.

    The resistivity meter takes a lot of time learning how to interput the readings. Building
    it is very simple if you just know how to solder. I plan on using my meter when I have
    a lot of time to stake out a search area and follow it through. At present I have only
    located the water table level in my yard. That was easy to see.

    I have also built his magnetometer and it also works.

    Take a look at the book "Seeing Beneath the Soil" by Anthony Clark. In it are explanations
    on how all this equipment works and shows the results obtained for analysis. Then you
    can be the judge of what equipment you need for the task at hand.

    I have the equipment to program PIC chips for these projects. HH

    Dinkydick

  6. #6

    Dec 2004
    1,382
    67 times

    Re: Resistivity machines...for real?

    resistivity meters are helpful, but not in all searches....they are useless in sandy soil, will give you fits in too wet clay , never even try in areas of quartz rock as unless you are wanting to crush ore for the minerals inside that the machine is picking up on you will be wasting your time, and digging big deep holes as the machines readings will show gold or silver very strong.....they will not read through bricks {underground vaults, or cellars },,, or glass, plastic, and a few other natural materials.....also if the ground is too wet or too dry, your readings will be affected also.......i am not bashing the use of the machines, just giving fair warning , that they are very good in the right place and element, but are useless in others.......i have used these many times, and will again, ...they are great for locating tunnels or unlined vaults,, and anything else as long as the conditions are right for its use.......i also suggest looking around alot before running out and purchasing a machine costing several thousand dollars thinking that it will magically lead you to your treasure because of the price....just another lesson learned the hard way by..............gldhntr.................also as of late there are data loggers and computer programs that are used in conjunction with the resistivity meters that make identification and reading results 100000 % better and easier i hear, and hope to be able to try these out in the near future.............g

  7. #7
    us
    Mar 2003
    Oregon & Texas
    Custom Designs and Prototypes
    1,573
    814 times
    All Types Of Treasure Hunting

    Re: Resistivity machines...for real?

    Quote Originally Posted by shiva
    1) From the older article I grabbed while I wait on the back issues to arrive,? if making them yourself is stainless steel the preferred material or is there a more preferred material to use?
    SS probes will not corrode which is nice, but with a 4-probe design the probe is not as much an issue as with a 2-probe design.

    2) I am still not completely sure I understand how this arrangement works in terms of the current going through the rods and which rod is picking up interference from another? Is there any way this can be "dumbed down" so that I understand exactly how the rods are measuring the resistance that is coming from the rods themselves?
    Not sure what you mean by "interference". Two probes are used to inject a forced current into the soil. Since it's a forced current, probe resistance & galvanic action have little effect. Another two probes are used to measure the resulting voltage drops in the soil. Since they feed a high-impedance measuring circuit, probe resistance has little effect and galvanic action is almost non-existent.

    You say that ERM's work. Try telling that to Mark and Jeff of Pa. They say it is in the same catagory as LRL's? They say that ERM's and LRL's are in the same catagory. How so? They say neither works. You say ERM's work but LRL's don't. I say that both of them work and I hope to prove it.
    Mark, Jeff... ERMs work. They are not LRLs. LRLs work too, but not the way everyone wished they did.

    I have seen at least a hundred times you saying that ERM's can be made for less than $100. Most now sale from $3,000. to $10,000. If they are so cheap to make why don't you go into business. Labor cost can't be that high. You yourself just now said that they work. I have always heard that if you could build a better mouse trap that it would make you rich. Here's your chance. I would like to purchase one of those cheap working machines that you can build.
    Well, I just might do that. What do you think would be a fair price for a 4-probe ERM with data logging and software analysis?

    - Carl

    P.S. -- gldhntr is correct... as with any equipment, ERMs have their limitations.
    I believe it, therefore it is true.

  8. #8

    May 2005
    77

    Re: Resistivity machines...for real?

    Dell Winders
    what kind of MLL / ERM are you using....what is the specific model...
    the is interpretation is very very clear....did you made an excavation already?
    what is the result?

  9. #9

    Dec 2004
    1,382
    67 times

    Re: Resistivity machines...for real?

    i believe dell is referring to the mll-100 = mother load locator, ground resistivity unit........have alot of experience with this unit......................gldhntr

  10. #10

    May 2005
    77

    Re: Resistivity machines...for real?

    Quote Originally Posted by gldhntr
    i believe dell is referring to the mll-100? = mother load locator, ground resistivity unit........have alot of experience with this unit......................gldhntr
    can u give me some link for this mll-100, coz i cant find one....thanks...what is your opinior regarding this resistivity...does it work well....how about this "poormans resistivity", the twin probe TR resistance meter...is it ok? there is a similarity on home made resistance meter that is very cheap...from EPE...they call it PIC base earth resistivity logger that costs only 72 USD, less the probes(you have to build one), with free software..any comment on this?

    thanks

  11. #11

    May 2005
    77

    Re: Resistivity machines...for real?

    hey dell....do you have a data logger for mll-100...what model...if none...how did you come up with the picture...did u enter the datum manually... how did you do it......any info please......

  12. #12

    May 2005
    77

    Re: Resistivity machines...for real?

    Quote Originally Posted by Dell Winders
    I don't own an MLL .We used one that was purchased by a friend that lives in another state, I entered? the data manually, and probably incorrectly, a year after the data was cvollected.

    Requested MLL Link:? http://treasurenow.com/html/MLL.html
    dell
    can u give me a view how did u do it manually...i cant visualize your procedure...thanks

  13. #13

    May 2005
    77

    Re: Resistivity machines...for real?

    Quote Originally Posted by jeff davis
    Carl,

    You say that ERM's work. Try telling that to Mark and Jeff of Pa.? They say it is in the same catagory as LRL's? They say that ERM's and LRL's are in the same catagory. How so? They say neither works. You say ERM's work but LRL's don't. I say that both of them work and I hope to prove it.

    I have seen at least a hundred times you saying that ERM's can be made for less than $100. Most now sale from $3,000. to $10,000. If they are so cheap to make why don't you go into business. Labor cost can't be that high. You yourself just now said that they work. I have always heard that if you could build a better mouse trap that it would make you rich. Here's your chance. I would like to purchase one of those cheap working machines that you can build.
    Yes Carl...build us some ERM, especially the twin probe from EPE with data logger...make it for sale for us..maybe less than 300.00USD complete with accessories....the twin probe ERM with data logger is almost the same price as the two probe from accumeter,fitzgerald etc....make our investment
    worthy....THis is an appeal to all electronic engineer and technician...build us a very very cheap ERM...not the "cheap" ERM that cost 2000.00USD...i can
    try to build some, but its time consuming to a beginner like me and it might not work the first time...and the components are not available to all countries...or the substitute components i dont know....SOS...

    Does anybody in this forum build/assembles EPE earth resistivity meter with data logger and make it for sale? i want to buy one hopefully not to exceed 300.00 dollar complete set...and the other one ERM two probe like this. http://www.thunting.com/geotech/page...150.pdf...with complete set, operational for less than 300.00USD also...i beleive its a decent prince then...


  14. #14

    May 2003
    USA
    216
    51 times

    Re: Resistivity machines...for real?

    Does anyone know if the EPE articles are posted anywhere on the net? I have one of the parts but not both. I'd like to build it and see how well it works.
    Thanks,
    Boattow

  15. #15

    Dec 2004
    73

    Re: Resistivity machines...for real?

    I'd say resistivity machines are real but do not work as advertised. Like so muich of This treasure hunting equipment, sounds great as advertised but falls short in the field. BP

 

 
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