FESEM problem

A user found that the astigmatism could not be corrected.  This is most often the result of metallic particles stuck to the pole piece.  I’ve wiped the pole piece and found very tiny particles – hopefully I got them all.  It will take several hours before I can test the scope.

Remember that you cannot put loose metallic particles into the FESEM – it has a very strong magnetic field below the pole piece.