GA-52CX Calibration??

[Daves]

I personally line them up vertically down towards the ground.!?

Is the flc-100 sensor spacing 12cm appropriate?

I set up the sensors with 12cm intervals facing downwards. I am receiving data from the sensor, when I turn the sensor right, left, up, down, the dc data increases or decreases. What is the alignment, zeroing, calibration etc. procedure I need to do before I start processing this data? In other words, in which direction should I hold them and what operations should I do?

[Carl-NC]

So, what is meant by alignment?

I'm not sure what Orbit is doing. In my FGM-based mag, both sensors are aligned in the tube like this:


One sensor is fixed, the other is mechanically adjusted for alignment.
The whole construction article is here.

[bklein]

I just received another GA-52cx. It seems a bit “off” from another one I have. The general sensitivity as I go through the sensitivity switch settings seems a little less than the other one and the tone pitch is not the same - but close. This and it has some FM going on that isn’t desired. There are 3 trimpots - two of them have been played with by the previous owner. The third is sealed in place.

Any ideas on a calibration process?
Would it be something that would not require special equipment?

[Altra]

Found this video regarding gradiometer magnetometers

https://www.youtube.com/embed/sTFIUyL0-Ow?

[bklein]

Ok, given that, what would you guess each of the 3 trimpots do and how would you go about optimising operation? I like your earlier suggestion of trimpot names but away from a target the tone and sensitivity is like the other one I have. Should I be moving a small target up and down the shaft and adjusting something like a differential gain?
I think I’m going to have to find an ex-employee with LinkedIn…

[bklein]

Hopefully, I do not need to do this: https://youtu.be/SnfnzlLM69I?si=qFZeKvtvtTKD5FoF

[Altra]

Hopefully, I do not need to do this: https://youtu.be/SnfnzlLM69I?si=qFZeKvtvtTKD5FoF

Thanks for posting this video. I have a very old GA-52 and wanted to remove the sensors from the tube . I have hesitated up to now, not wanting to damage or destroy anything.

Have you tried contacting their service department? Some times a tech will give some good info without sending the unit in.

[bklein]

If it were mine I’d spray some of that bolt-loosener stuff and let it sit awhile before trying this. That volume control he’s hitting with the hammer is $42 plus shipping.

There is a “talk to our techs” option on their website. I left an inquiry.
There are several businesses and individuals that work on these. It’s all kept secret on how…