leemanwebbstormlaboratory The magnetometer will work but has a limited dynamic range. Most available mags have a lower sensitivity limit of about a nT. There...
Hello group... I seek help with a SAM magnetometer in Sweden and hope to have it fixed before the ground freezes above the sensors when the winter comes :-) ...
Hello group: First of all - I am new to this group. My greetings to all members Jan: I am not familiar with your SAM magnetometer, but I assume X an Y stand...
Usially X is for N-S and Y for E-W (Z for the vertical component). Your SAM has 2 FGM3 fluxgates positioned N-S and E-W I therefore assume. Before a further...
Ciao a tutti! Free access to the "online journals of the Royal Society" for two month http://www.journals.royalsoc.ac.uk download as much PDF's as you can! ...
I'm working up a simple DC output magnetometer based on the FGM-3 with a negative feedback coil, to phase lock its output to a crystal oscillator. I could use...
I have been working on a magnetometer system based on the FGM-3, and have had to dig to find out many needed bits of information about it. I discovered by...
Not that I would know ;) , but there are certain solvents that will disolve the epoxy / potting of the FGM unit, and an air core works just as well with that...
I am getting ready to begin testing my FGM-3 based magnetometer that produces an analog output based on phase locking the FGM-3 to a crysyal oscillator with a...
I have made a first attempt at reconstructing the schematic of the FGM-3 magnetometer. The component labeled xray and schematic are in my photo album. ...
Hi John: Thanks for the X-Ray. When I tried it the result was not as good. I think you should have 4 coil terminals: L1, L2, L3 and L4. Two are for the...
... I deduced the connections I show on the schematic partly by a resistance measurement between ground and feed back pin (<10 ohms) and the recommendation...
HI John: I agree there are two coils, and it would be good to call the terminals L1, L2, L3 & L4. It might help to have an X-Ray taken with the unit rotated...
... The pairs of stacked traces are offset just enough that I can tell which is which for most of the branches. I think. ... Thank you. This should provide...
I just received my transparancy scanner from eBay and replaced the first xray of the FGM-3 with a better version in my photo folder. I also placed a file of a...
Folks, I'm sorry, but yahoo web services doesn't behave like it did in the fist days. So message posting, notices, etc. might take a little longer than...
YAHOO web services doesn't behave like it did in the first days. So message posting, notices, etc. might take a little longer than expected due yahoo's ...
I am new at this but just posted a circuit using the KMZ10 magnetic sensor with temp compensation. Unfortunately I have no means of flipping (but see how I can...
... how ... I think any OP amp as current source will work. I have some questions on your schematic. What is the amplitude on the connection line ? Why are you...
... The only difficulty in building a coil is to design a low noise and stable current source to drive it. I assume you just want to use it as an offset bias....
Thanks for your comments, John and Alexander, From your comments it is obvious I do not know what I doing. All I did was take the KMZ10 circuit from the app...
To aid in reconstructing the internal structure of the FGM-3, I have uploaded to my photo folder, scope captures of the feedback pin waveform, the supply...
... (snip) I did not meant to tell you that your circuit was wrong or bad, but just that you might be able to push a bit more signal to noise ratio out of it...
... I thought the same way. I found an op amplifier, made by Linear, LTC2050, however Analog's are also very good. I do not care about DIP packaging, but I...
... noise, ... (snip) ... I think, for this bridge source, an instrumentation amplifier configuration is most likely to provide a low noise, supply rejecting...
... This schematic certainly resembles what I find inside the FGM-3, in many ways. Does it represent your reconstruction of that device, a reference to a...
Hi Les: Do you have more details on L3-L4 like # of turns, wire size, core dimensions, etc? Thanks very much, Brooke Clarke w/Java http://www.PRC68.com w/o...
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