[3dem] question

Kazuyoshi Murata kazum6 at gmail.com
Wed Oct 21 15:36:46 PDT 2009

Hi Qui-Xing,

Does the problem happen in the cryo-holder or the JEOL standard
holder? The same problem happened in our 2200FS when we used the gatan
cryo-holder. We replaced the spring and the o-rings in the goniometer
to stronger ones to keep the heavier cryo-holder, then the problem was
fixed. If you use the default spring and o-ring, you can ask to JEOL.


On Wed, Oct 21, 2009 at 3:04 PM, Qiu-Xing Jiang
<qiu-xing.jiang at utsouthwestern.edu> wrote:
> Dear colleagues,
> We recently found that the goniometer of our JEOL2200FS FEG has information
> loss at the direction normal to the tilt axis when the holder, eitehr RT or
> cryo, is tilted to ~25 degrees or higher. At 60 degrees the effect is quite
> severe, while at 0 degree it appears fine. We are not seeing obvious
> vibration or drift at the affected direction using a standard graphite grid.
> Our engineer is trying different ways to trace it with limited success. I
> wonder if some of you ever encountered similar problems and were able to
> eliminate them.  Thanks in advance for sharing your experience and offering
> advice.
> Qiu-Xing
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> 3dem at ncmir.ucsd.edu
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