peter@cs.uwa.oz.au (Peter Dodd) (03/06/91)
Hello, A group within our Physics department have a 5 Tesla solenoid for testing properties of magnetic materials. The machine is controlled via serial cables driven by a SE30 and HyperCard. It is required that the Mac be close to the machine for the operator to see what is happening. When the field is at 5T nearby colour monitors are visibly distorted and the SE's screen is just starting to distort. The group are about to take delivery of a 12T solenoid, so my question is : Will a hard disk on SE30 start losing data in this field ? Peter Dodd Computer Science Dept University of Western Australia peter@cs.uwa.oz.au
kaufman@neon.Stanford.EDU (Marc T. Kaufman) (03/07/91)
In article <1991Mar6.032150.4764@uniwa.uwa.oz> peter@cs.uwa.oz.au writes: > A group within our Physics department have a 5 Tesla solenoid for testing >properties of magnetic materials. The machine is controlled via serial cables >driven by a SE30 and HyperCard. It is required that the Mac be close to the >machine for the operator to see what is happening. When the field is at 5T >nearby colour monitors are visibly distorted and the SE's screen is just >starting to distort. > The group are about to take delivery of a 12T solenoid, so my question is : > Will a hard disk on SE30 start losing data in this field ? It's hard to tell, Peter. Just how far away from the magnet IS the Mac? What is the orientation of the field with respect to the spin axis of the disk? What is the residual field measured at the Mac (I presume it is not 5T or 12T unless you put the Mac INSIDE the solenoid). Tell you what,... why not find a physicist who specializes in the properties of magnetic materials, and ask him? I hope you can find one.... Marc Kaufman (kaufman@Neon.stanford.edu)