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Electron Microprobe Lab, University of Minnesota
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Hi Ritchie,
I have a probe about half that age, but it has been used a lot, and it is now giving me a fair bit of trouble.
Computers have died, power supplies have failed, chips that nobody makes anymore have gone, new x-ray detectors required etc. All fixable but yes it takes time and money.
My big problem right now spectrometer reproducibility. The spectrometer doesn't always go back to the correct position, giving me a count rate that varies by too much (eg 5% measuring the Ka of a pure metal).
Any advice on what to check next?
cheers,
Ron
________________________________
From: JEOL-Focused Probe Users List on behalf of Ellery Frahm
Sent: Wed 20/05/2009 10:26
To: [log in to unmask]
Subject: Re: [PROBE-USERS] JEOL 733 continuing viability
JEOL Probe Users Listserver
Moderator: Ellery Frahm, [log in to unmask],
Electron Microprobe Lab, University of Minnesota
Post a message: send your message to [log in to unmask]
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On May 19, 2009, at 6:43 PM, Eric Essene wrote:
> Ritchie,
> I think it is crazy to have an EMP without EDS. Does it have BSE?
> cheers,
> eric
Perhaps, but EDS is at least straightforward enough to add as a
standalone system. And at least the microprobe will work without EDS
-- if you have the time, a WDS scan will do the same job than EDS
will. Also, if users have done their optical mineralogy first, the
need for EDS is decreased.
General maintenance and repairs are much bigger issues. Can you get a
service contract? If not, do you have the resources (money or time
and materials) to replace, say, a stage encoder that goes bad? Or
something as simple as a spectrometer belt, which only last 5 or 10
years? Without a service contract, you've a much bigger challenge
ahead of you to care for a 30-year-old instrument. Think about how
much money an old car costs for upkeep.
Ellery
-----------------
Ellery Frahm
Manager & Principal Analyst, Electron Microprobe Lab
Senior Research Fellow, Department of Geology & Geophysics
University of Minnesota - Twin Cities
http://probelab.geo.umn.edu <http://probelab.geo.umn.edu/>
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