CM120 Operation Instruction

Chen Xu


    
  

Abstract

This document tries to list steps and procedures for a typical daily operation on CM120. You can use it as guidebook to help you when you are sitting with CM120, especially if you are a new user. I here assume you are already familiar with scope interface, what the knobs and buttons do etc.. You might use the section titles as quick bullet p ints, but the explanation inside each sections are supposed to be useful and informative. A pdf version of this document is also available.

If you have suggestion how to improve this document to make it more useful, please feel free to let me know. Thank you!

NOTE: all the turning knobs on the panel and push buttons are marked [ like this ].

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Table of Contents
1. Check log book to see if there have been any problems
2. Check vacuum status
3. Add Liquid Nitrogen to the BIG anti-contaminator dewar
4. Apply High Tension
5. Turn filament on
6. Check saturation and gun tilt, and then saturate the filament.
7. Check C2 aperture mechanical position and C2 stigmatism
8. Check specimen holder & load grid
9. Insert specimen holder into column
10. Adjust the specimen height to the eucentric height
11. Check Beam Tilt Pivot Point X, Y
12. Check voltage and current rotation centers
13. Put in objective aperture and center it
14. Check Objective Lens stigmatism
15. Typical Low-Dose setup parameters
16. Align an identified area under [ Exposure ] and [ Search ]
17. Check S1 and S2 parameters
18. Finishing Up

1. Check log book to see if there have been any problems

It is always a good idea to check the LOG book. You can find useful information listed there, such as:

  • If there have been any recent problems with the scope.

  • The conditions that were used last, especially the filament saturation.

  • Any special note that last user wants you to know.

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