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<p>We have seen this due to room vibration and/or noise in the
room. <br>
</p>
<p>For example, we use a heavy-duty dehumidifier in the summer, and
we need to turn it off if we want isotopic Thon rings.<br>
</p>
<br>
<div class="moz-cite-prefix">On 12/29/2017 2:23 PM, Garry P Morgan
wrote:<br>
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cite="mid:D54771D8-1D6A-4C65-871D-8E91B1ADFB57@colorado.edu">
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Hi,
<div>we’re getting consistently clipped FFT’s on our TF30…the
attached image is from a 50-frame, summed/aligned image of the
carbon (of a cryo-grid). the drift numbers are reasonably low,
there is no astigmatism. just wondering if any of you can
provide a possible explanation of this? it definitely looks
like drift or some sort of movement, right? we have 2 Gatan 626
holders, and it seems to only be happening with one of the
holders…has anyone encountered a problem like this associated
with a holder? </div>
<div>thanks,</div>
<div>Garry</div>
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