Hi,
I would like to know, for some devices that I have (e.g. PDA, calculator, etc.), the maximum magnetic field they can cope with. How can I know it, without testing (obviously), and if no such information are displayed on the device's sheet? Thanks.
"Merciadri Luca"
** Why don't you post details of the actual scenario you are considering ??What IS the source of your imaginary magnetic field ??
A loudspeaker magnet or an MRI machine ???
** It's not specified cos there is no meaningful way to specify such a thing and very few people would be the least bit interested...... Phil
??
Not MRI machines, evidently, but I have one calculator and one PDA, and both could be important for me at work. If I have to work in an environment where the magnetic field is intense, and that I carry them, I do not want them to be broken in some way. I can't foresee the place where I am going to work at, but I can predict that if the magnetic field is too important (i.e. special plant), my devices won't resist to it.
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Why? The wrapper device's shells are known, and the chemical and physical properties of these shells are known. Experimental, or at least theoretical measures can be done to know, at least approximatively, the maximum magnetic field the different devices can cope with. This looks like an important characteristic of a device, especially if this device is an engineering device. How can you go to some plant with high magnetic fields (i.e. physics research, etc.), carry your personal devices, and know if they are still going to work there, or at least if they are not going to be broken, or undergo data corruption?
Why? The wrapper device's shells are known, and the chemical and physical properties of these shells are known. Experimental, or at least theoretical measures can be done to know, at least approximatively, the maximum magnetic field the different devices can cope with. This looks like an important characteristic of a device, especially if this device is an engineering device. How can you go to some plant with high magnetic fields (i.e. physics research, etc.), carry your personal devices, and know if they are still going to work there, or at least if they are not going to be broken, or undergo data corruption?
Wouldn't there be restrictions on what you could bring into these areas? You really can walk around with things in your pocket anywhere you want?
Yes, but it might be shown `only devices coping with magnetic fields
Good question: the easy answer is, they have to tolerate 0.5 gauss (which is kinda the background field on much of Terra). Slight exception: CRT displays are commonly tuned up aimed in magnetic N direction, and DO change according to orientation.
Static B fields also disable photomultipliers and, if strong enough, saturate magnetic elements (causing distortion of signals, or can pop fuses attached to power inductors). Dynamic B fields cause EMFs in most wiring (hopefully, though, not coaxial cables). I've even heard of transient B fields damaging woodwork, but that was a big fast current switch that made cables jump. The folk who shrink pennies are demonstrating the structural failure of metal disks with high B field transients...
"Merciadri Luca" "Phil Allison" "Merciadri Luca"
Not MRI machines, evidently, but I have one calculator and one PDA, and both could be important for me at work. If I have to work in an environment where the magnetic field is intense,
** Really ??Explain what the source is or go drop dead - you stupid damn TROLL.
Why?
** Try reading what I wrote - s*it head." It's not specified cos there is no MEANINGFUL way to specify such a thing and VERY FEW people would be the least bit interested. "
Explain what the source YOU have is or go drop dead.
.... Phil
Go take your medicine, Phillis. This is news:sci.electronics.basics not news:aus.sheep.shaggers.toaster.molesters
"Merciadri Luca" "Phil Allison"
Not MRI machines, evidently, but I have one calculator and one PDA, and both could be important for me at work. If I have to work in an environment where the magnetic field is intense,
** Really ??Explain what the source is or go drop dead - you stupid damn TROLL.
--------------------------------------------------------------------------------
Why?
** Try reading what I wrote - s*it head." It's not specified cos there is no MEANINGFUL way to specify such a thing and VERY FEW people would be the least bit interested. "
Explain what the source IS or GO DROP DEAD !!!
You DAMN TROLL !!
.... Phil
Thanks.
Go down to T-mobile and get an Android phone. They have a 3 axis magnetometer so they can find north no matter which way the phone is oriented, and show the map right side up. The specs say it is sensitive to 7000 micro teslas or something. I cant find the specsheet right now darnit. I wonder if you could put the phone in an mri turned off, shoot it, take it out and have it work?
Mister Luca... Welcome to the sci.electronics.basics Club of The Initiated who have been cursed by good ol Phil from Down Under. He has probably singlehandedly done more damage to Austrailian International Relations with engineers worldwide than a whole cruise ship full of loud rude Yanks with flowered shirts. Man am I glad he aint an American. I have enough of a problem defending capitalism to domestic socialists without having to defend bipolar sociopaths that are rude to perfectly polite strangers. I bet the next message is him telling me I have symptoms of Autistic Spectrum Disorder...
What's wrong with noisy yanks and flowered shirts?
Jamie.
Can you define "intense"?
John
Certainly. It's where one sleeps at night when camping....
Bob M.
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