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particles

Ferromagnetic particles in FESEM

April 22, 2014. We noticed that the astigmatism could not be adequately corrected even with the stigmator adjustment at the end stop. I opened the specimen chamber and found ferromagnetic particles attached to the objective lens by the magnetic field. This is not good. It makes trouble for everyone. We …

TEM Viewport Cover

TEM camera

April 26, 2012. This is a repeat of an earlier message about the TEM camera. There are dust particles on the TEM camera element. This is impossible to prevent, but the software has been designed to “erase” the effects from images. This is accomplished by a calibration that I periodically …