[3dem] FFT question

[Nadav Elad]

Hi Garry

We had the same problem on our F20 with 626 holders. There were two sources of vibration. One was the K2 processing unit, which was at that time in the F20 room. The second source was the chiller. Connecting to another chiller finally solved the problem.

Best
Nadav


-------- הודעה מקורית --------
מאת: 3dem-request at ncmir.ucsd.edu
תאריך: 29.12.2017 21:25 (GMT+02:00)
אל: 3dem at ncmir.ucsd.edu
נושא: 3dem Digest, Vol 124, Issue 39

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Today's Topics:

   1. FFT question (Garry P Morgan)


----------------------------------------------------------------------

Message: 1
Date: Fri, 29 Dec 2017 19:23:54 +0000
From: Garry P Morgan <Garry.Morgan at Colorado.EDU>
To: "3dem at ncmir.ucsd.edu" <3dem at ncmir.ucsd.edu>
Subject: [3dem] FFT question
Message-ID: <D54771D8-1D6A-4C65-871D-8E91B1ADFB57 at colorado.edu>
Content-Type: text/plain; charset="windows-1252"

Hi,
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?
thanks,
Garry

[unknown.jpg]
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