SPI Faraday Cup
Instructions for cleaning
It should not normally be necessary to routinely clean a Faraday cup.
However, should the mount itself develop signs of contamination, and if it
is lightly buffed, remembering that this should be avoided if at all
possible so as not to remove the electron beam lettering, it is highly
likely that non-conducting particles, from the buffing, could end up
contaminating the aperture hole, causing the beam to behave erratically.
Should this turn out to have happened, then the entire mount with the
Faraday cup, should be placed face down on a soft surface such as
lint free cotton, in an ultrasonic
alcohol bath for 30 seconds. Remove and allow to dry face down on another
piece of either lint-free cotton or
Selvyt® Polishing Cloth.
Remember that in the case of the SPI electron beam lettered standards for
electron beam microanalysis, if the lettering does get polished or buffed
off inadvertently, you don't have to purchase a new standard. Just take
advantage of the
SPI standard refurbishing service.
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