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16
Section V.
Care
of the Instrument
5.1 Main Chamber (Instrument)
The main chamber should be kept sealed at all times, and under vacuum if possible. Only
vacuum-compatible material should be exposed to the vacuum of the instrument. When
operating the instrument in the vacuum ultraviolet region, the vacuum should be better than 5 x
10
-5
Torr.
5.2 Bilateral Slits
The knife edges that form the slit aperture are mounted on Ball Slides and therefore require no
lubrication. Nothing should contact the slit jaws directly; the slides are spring-loaded to
prevent damage, thus their positions can be changed if they are contacted directly.
5.3 Scanning Mechanism
The precision drive screw is located in the instrument base and should be lubricated every 6
months with the oil supplied.
5.4 Optical Surfaces
The optical surfaces are extremely delicate and can be permanently damaged by mechanical
contact with anything. Do not touch, talk or breathe over the optical surfaces. After long
periods of use, the optical surfaces become contaminated and therefore have a drastically
reduced efficiency. Princeton Instruments can generally re-coat the optical components and
obtain their original efficiency, depending of course on the condition of the surfaces. Please
contact Princeton Instruments directly if you believe the optical surfaces are contaminated
or damaged.