FGM-3 Alignment and Calibration

[fitz]

My Idea please have at it.

So in the pic I am using square PVC on the outside. The angle aluminum holds the sensors and has set screws in it to adjust the sensor against high density foam rubber. I think 4 screws on one sensor should let me get it just right. Do I need to adjust both sensors or will one do it???
Thanks
fitz.
[/IMG]

[damiafix]

Many thanks for the replyes, I understand clearly! The thermal variations over time can misalign the two sensors, will always need a ceck before use, right? I Mention the use of aluminum because in this forum, many people have replaced the PVC pipes with it, and also in the EPE probe it's used. This aligment can to be perfect? In other words, pratically, it is possible to measure 0 volts on the DAC, or is it just a given theory?

All the best, D.

[epitopios]

callibration

dear Damiafix
I think that FGM-3 must not come close with anything metal ,
better soloution is panzerfaust at his foto
friendly , epitopios

[Crowbar]

No, cause:
1) FGM-3 case isn't a true cylindric.
2) True magnetic axis won't match a case axis.

[damiafix]

Hi, I'm sorry, the tension of 0,15volts is between the GND ad pin 14-15 of the AD557 (Dac).
I've a question, if I use a right-angled aluminium section, as showed in the Epe project:

the two fluxgate sensors, will be directly and perfectly aligned?

All the best, D.

[damiafix]

Hi,
for the calibration of the two FGM-3, the lowest value that I can to measure from the
GND and pin 14-15 of the SCL007 is 0,15 volts; zero for me is impossible,
someone have got success and measured 0 volts?

Many thanks, D.

[epitopios]

gradiometer+datalogger

Hi damiafix
until now I made two dataloggers
one is Data logger of Deluxe



and the other one is Data logger Kit877 of EPE of Magenta Electronics



but until now i can manage to mix my gradiometer with some of this 2 D.L.
because I have no help and knowledge about that
so , for now ......
or to show to us here, something to go on with that
if someone could help us , i aprecciated
friendly , epitopios

[damiafix]

Hi epitopios,
my gradiometer work, but I must to calibrate the two fgm-3 correctly, so the performances, now are very
low! I hope to finish it in the next days. For the datalogger, I wish to build a E.P.E. what
do you think about? What is the data logger that you prefer?

All the best, D.

[epitopios]

FGM-3 Alignment and Calibration

Many thanks epitopios for the links!

All the best, D.

P.S. Your Mag work correctly?

what about yours , is it working ???
and what about datalogger ?
friendly epitopios

[epitopios]

FGM-3 Alignment and Calibration

Many thanks epitopios for the links!

All the best, D.

P.S. Your Mag work correctly?

I am still working on , need very good and standard calibration
I also have 2 dataloggers (E.P.E. and Deluxe) trying to mix with my Gradiometer , also these days i make a data logger from Everyday Practical Electronics 2004 ,Mag Logger 5, but i find difficult its softeware

friendly , epitopios

[damiafix]

Many thanks epitopios for the links!

All the best, D.

P.S. Your Mag work correctly?

[epitopios]

Corrected Geomagnetic Coordinates and IGRF/DGRF Model Parameters
Corrected GeoMagnetic coordinates Use this site to calculate your magnetic conjugate point.


World magnetic chart World map showing magnetic coordinates. Easy to estimate conjugate points.



friendly epitopios

[panzerfaust]

FGM-3 Alignment and Calibration

Wonderful! Do you have aligned the sensor? The mag work?

All the best, D.

P.S. Do you use the analog meter for the battery charge?

Hello,

Unfortunatly, it doesn't works yet. I just have to align the sensors but I actualy don't have many time.

The analog meter is used to check battery level.
I plane to add a digital voltmeter to show a "live" value, as explained by Carl in previous mail.

Hope it will works soon!

Best regards.

[damiafix]

Wonderful! Do you have aligned the sensor? The mag work?

All the best, D.

P.S. Do you use the analog meter for the battery charge?

[panzerfaust]

FGM-3 Alignment and Calibration

Thanks for your help guys .

Please find some pics of my mag. I have machined several parts in order to have as accurate alignment as possible. See below.