OK, the parts kit is here and my "Dead Micronta 4001 metal detector to dual FGM-3 gradiometer mag conversion" project is now officially underway... :) I have...
Rob, There is no "reset" function on the SCL-007. Pin 18 is labelled RESET because it is, in fact, reset by the input from the other FGM-3 sensor to obtain the...
Hi: I've received some sample ring cores that may make good fluxgate magnetometers. The metal has an OD of 1/2", ID of 3/8" and height of 0.111" The...
Hi all, Has anyone noticed a slow gradual long term drift of their magnetometer ? I've been monitoring this for Months & not found out what is causing this...
It may be moving slightly relative to the earth's field. Have you getting a lot of rain there? If it's buried, the ground is expanding slightly as it absorbs...
Hi Erich, No, my magnetometer is inside the house on a sturdy shelf, checked for signs of the bracket buckling & such but even that seems ok. Thanks for your...
In the past I've tried to obtain a couple of sample PNI magneto-inductive sensors (the unshielded leaded variety), but they were asking something like £20...
As I am one of the developers of the PNI technology I can tell you for certain that the sheld is an EMI shoeld to try and keep radiation from the coil to a...
Ah - so it's to prevent RFI emission ... Thanks a lot John - appreciated - that's the kind of explanation I was looking for. There was zero info in the data...
Rotational calibration is available in almost all compasses. It is a simple math routine. Even the fluxgates use it. I fyou want any of the math to make the...
Hi Mark, Magnitude or direction? Or is it not possible to distinguish? What component(s) are you measuring and with what kind of magnetometer? Also, can you...
Hi Doug, Not sure if it's direction or magnitude, I would probably think magnitude. I'm using a dual sensor kmz sensor from Philips (sorry I totally can't ...
Hi all, Just found this description:- Long Term Drift Long term drift is common with magnetometers. Once there has been more data gathered over longer periods...
... Hi John thanks very much for your kind offer - appreciated. I'm ok at the basic concepts (I hope!), but woefully lacking when it comes to the math...
Hi all, Just a thought, do any of you chaps know if the magnets in hi-fi speakers gradually lose there magnetic strength over time ? With my long-term magnetic...
I spent 25 years in pro audio. You don't need to worry about your permanent magnet speakers unless you beat them up physically. The earth's magnetic field ...
Hi John, Thnx for reply, yes i did quite alot of research lastnight on the good olde internet, i couldn't find any significant findings on magnets losing...
Hi John, Thnx for reply, yes i did quite alot of research lastnight on the good olde internet, i couldn't find any significant findings on magnets losing...
My magnetometer drifts all over-I assumed that it was measuring the earth's magnetic field drifting. Are you measuring something else? If you are using an ...
Hi John, I use a Philips KMZ(something, can't remember the number) dual sensor, i've managed to get rid of temperature drift & all voltages are steady. There...
New Magnetic Sensor 1000 times more sensitive than existing chip type. http://www.eetimes.com/news/semi/showArticle.jhtml?articleID=202801602 Cheers...
New Magnetic Sensor 1000 times more sensitive than existing chip type. http://www.eetimes.com/news/semi/showArticle.jhtml?articleID=202801602 Cheers...
Hello! I just joined, and am building the fatquarters' fgm-3 gradiometer kit with the intention of towing it behind a boat to look for shipwrecks. I am also...
USGS posted a new online strip chart display from many observatories: http://geomag.usgs.gov/realtime/ <http://geomag.usgs.gov/realtime/> Note that you can...
Hi: I have a number of very early electro-magnetic Toy DC Motors and would like to find out what the maximum drive voltage is that's useful. Measuring the ...
Ok...so do I understand this right...you have some old DC motors that you do not know what the operating voltage is on them...? I would say this, if I would be...
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