[3dem] odd CCD images

[David Gene Morgan]

Hi,

	Within the space of a couple of hours, our Gatan CCD camera (a fairly 
old Ultrascan 890) went from taking good (normal) images to the sort of 
image I have attached a piece of.  I can supply the original dm3 file if 
anyone thinks that would be useful, but it looks just like the piece I 
here.  The wiggly pattern you see in the attached image changes over 
time and appears even without any illumination.

	We have been in contact with Gatan and have tried a number of things 
they have suggested, but nothing fixes this problem.  We think we have 
eliminated stray fields, loose connections of various sorts, a bad 
firewire cable, etc.  We think that it is a problem within the camera 
itself and are in the process of setting up a service visit.

	Has anyone ever seen this sort of problem with a Gatan CCD camera, and 
if so, what was the solution?  [other than buying a new camera...]

	Thanks.

-- 
                  David Gene Morgan
              Electron Microscopy Center
                   047D Simon Hall
                   IU Bloomington
                812 856 1457 (office)
                812 856 3221 (3200)
            http://iubemcenter.indiana.edu
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