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11-06-2009, 07:02 PM
| #561 |
| Senior Member  Join Date: Dec 2006 Location: York Pa
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Similarly, if you align any piece of steel north/south and let it sit there, it will become magnetized. This is an issue with long term storage of pipe lengths because welding on magnetized steel is a nightmare. Google I'll check out some other saw cut steel in the shop and see what I get. Forged steel is known to be magnetic, there are even people out there who specialize in degaussing the stuff: Magnetic Products and Services, Inc. (The Gaussbusters) - Home Page
__________________ -Mike |
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11-06-2009, 08:11 PM
| #562 | |
| Senior Member  Join Date: Feb 2008 Location: Milano, Italy
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11-06-2009, 09:04 PM
| #563 | |
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11-12-2009, 06:42 PM
| #564 |
| Senior Member Join Date: Dec 2006 Location: York Pa
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Alrighty, after some more work, I've got some context to what I'm playing with. Bad things start to happen to arcs above 60 gauss. Now I know Brad (RedHouse) calibrated these, but am I playing in a range where the error of the calibration could be effecting my readings significantly? If they're off by 5 gauss, that's no problem, off by 10, that's starting to make me nervous, off by 20 and I need to find a way to calibrate this beast. Sawing these parts doesn't seem to be inducing magnetism. Machining might, but I'll have to wait until my big part gets back from the machine shop to see.
__________________ -Mike |
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11-12-2009, 07:58 PM
| #565 |
| Senior Member  Join Date: Apr 2009
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A1302 sensor is not rigth for accurate measuring in that range.... least of all brad calibration.... you need a high sensitivity, factory calibrated sensor...
__________________ .......my gaussmeter project..... schematic & pcb ........ .......first pickup with my cnc winder........ |
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| The Following User Says Thank You to -Elepro- For This Useful Post: | RedHouse (11-12-2009) |
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11-12-2009, 08:18 PM
| #566 |
| Senior Member Join Date: Dec 2006 Location: York Pa
Posts: 492
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Could you suggest a sensor that would be accurate in that range and compatible with the PIC firmware?
__________________ -Mike |
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11-12-2009, 08:30 PM
| #567 |
| Senior Member Join Date: Apr 2009
Posts: 217
| A1321LUA Calibrated Linear Hall-Effect Sensor with this range would be about +- 450 gauss.... and it is factory calibrated
__________________ .......my gaussmeter project..... schematic & pcb ........ .......first pickup with my cnc winder........ |
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11-12-2009, 10:48 PM
| #568 |
| Senior Member Join Date: Dec 2006 Location: York Pa
Posts: 492
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Excellent. So since this is calibrated from the factory, I just enter 5.000mv/G, which is the data sheet value, into the calibration for the PIC and I'm good to go?
__________________ -Mike |
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11-13-2009, 06:02 PM
| #569 |
| Senior Member Join Date: Apr 2009
Posts: 217
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i think they send a datasheet for your specific sensor.... with the exact sesitivity value... (it will be 5.000 or 5.010 or 5.026.... ecc) (it is not a special sensor... only it is a sensor measured before sell) yes... enter value in calibration menu and you are good
__________________ .......my gaussmeter project..... schematic & pcb ........ .......first pickup with my cnc winder........ Last edited by -Elepro-; 11-13-2009 at 06:35 PM. |
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