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I finally got the LCR Tester from China. It uses the M328 if that means anything to anyone. It cost $14 and one of the reasons I bought it was because it measures inductance - I realize it won't be perfect. I tested the 4 mono coils I made while building the board. The resistance of the coils measured with the LCR were pretty much the same as my mm. But the inductance for all of them was less than I thought - they all seemed to be .22 or .24ish. I was thinking I should shoot for about .300-.320 based on bbsailor's paper. So I wanted to add a few turns of wire, but I didn't have enough left so I soldered an extra length of wire to the existing coil. I'm guessing many who are reading this are cringing...but I'm curious if it really matters in any way. The change in diameter is not noticeable and it gives me the inductance of .320 and resistance of about 1.8. So....does it matter if you splice together wire in the coil???
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The apprehension to the soldering together of the wire in the coil originates with the thought that the solder will be picked up as a target as well since it will have eddy current induced into it. I recall Carl stating that the eddy current would indeed be formed however since the solder is moving along with the rest of the coil the effect would be essentially canceled out as it was not a static target (or words to that effect) -
Solder blobs in the coil are only a problem if you're using extremely aggressive early sampling, which is not the case for any of the detector projects in the Geotech forum. Certainly the Surf-PI, Baracuda, and MPP versions would be unaffected.Originally posted by surfdetector View PostComment
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How do the measured values compare to those from the Coil Calculator?Originally posted by lmrubin View PostComment
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I have downloaded the coil calculator several time but cannot get it to work. Am I missing something?Comment
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We need a bit more information than "cannot get it to work".Originally posted by MartinB View Post
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I am the same, I never managed to make it work! I finally used EKALK and coil 32.Originally posted by Qiaozhi View PostWe need a bit more information than "cannot get it to work".Comment
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Same question for you ... What was the problem? Did the program not run at all, or you couldn't get any results?Originally posted by lamoiz View Post
The coil calculator is written in Javascript, and therefore will run on any operating system in any browser. Simply open the coilcalc.htm file, and make sure you enter the inner radius of the coil in the first field of the dialog box, and not the diameter.Comment
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George, yes the program didn't work at all. I just put the values, but it does nothing, I thought that my computer had a problem .. so I tried on another pc and the same .. no operation either. This is why I am now using another program. I think that I am not the only one, but I do not understand now that you have explained this.Originally posted by Qiaozhi View PostComment
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There have been 1000s of downloads without any problems. I have tested the coil calculator on numerous browsers and different operating systems, and they all worked ok.Originally posted by lamoiz View Post
Do you have Javascript disabled in your browser?Comment
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Did you click the 'Calculate' button after filling in Radius, wire diameter & number of turns?Originally posted by lamoiz View PostComment
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I have a download from awhile back, Works, colored screen with calculate button. When I download today, plain screen no calculate button.Originally posted by waltr View PostComment
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