tag:blogger.com,1999:blog-10666456.post110779930693381699..comments2024-01-08T15:04:49.691-06:00Comments on Dean W. Armstrong: Dean W. Armstronghttp://www.blogger.com/profile/01775475819534188248noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-10666456.post-1140239232489276942006-02-17T23:07:00.000-06:002006-02-17T23:07:00.000-06:00This type of mass spec has been in use for some ti...This type of mass spec has been in use for some time called a magnetic sector instrument. They used large electromagnets to vary the field strength. <BR/><BR/>see:<BR/>http://www.chemistry.adelaide.edu.au/external/soc-rel/content/mag-sect.htmAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-10666456.post-1109527581193927052005-02-27T12:06:00.000-06:002005-02-27T12:06:00.000-06:00Physically big? They are 2 to 3 mm thick, approxi...Physically big? They are 2 to 3 mm thick, approximately 2 x 1 cm. In the hard drive they come in pairs, so if you keep the pair together, you get a doubly strong field that I think is normal to the surface of the magnet. The other side of the magnet is kept with a large steel piece. I believe the strongest one I have is roughly 1 Tesla.Dean W. Armstronghttps://www.blogger.com/profile/01775475819534188248noreply@blogger.comtag:blogger.com,1999:blog-10666456.post-1109482674370047332005-02-26T23:37:00.000-06:002005-02-26T23:37:00.000-06:00How big are those hard drive magnets? AS&S has som...How big are those hard drive magnets? AS&S has some pretty gnarly magnets, though I'm not sure if they're as powerful as the ones in hard drives. Or if the added strength is worth the cost.colinhttps://www.blogger.com/profile/11266629198292478860noreply@blogger.comtag:blogger.com,1999:blog-10666456.post-1108005209346506432005-02-09T21:13:00.000-06:002005-02-09T21:13:00.000-06:00Measuring current seems too sensitive--can I measu...<I>Measuring current seems too sensitive--can I measure nanoAmps?</I>Perhaps you could run the current through a resistor? The DVMs the physics department uses for all the teaching labs are pretty basic, and they'll easily pick up microVolts. Maybe even nanoVolts, I can't remember. All you would need is a resistor of no more than kiloOhms.colinhttps://www.blogger.com/profile/11266629198292478860noreply@blogger.com