270M
Rapid Scanning
Imaging
Spectrograph
6 Installation and Care of Optical Components:
Excepting those times when exchanging optional gratings, most users will not need
to
open the instrument after the inital unpacking
6.1
Mirrors
and
Gratings:
The mirrors and gratings in your spectrometer require no routine maintenance. Still,
care should be exercised
to
prevent damage
to
their surfaces which will degrade
throughput. Your spectrometer should be kept in
an
atmosphere free of dust,
corrosives and smoke.
Be
careful to avoid touching a grating surface.
WARNING: Never turn the swingaway mirrors by hand when the power is on. The
gearhead motors are delicate. Forcing them manually may result in time consuming,
costly repair.
Dust or other solid debris should be blown off with dry dusting gas or nitrogen. Be
sure
to
hold
cans
of
dusting
gas
upright.
If
they
are
tilted
or
inverted,
liquid
propellant
may
be
discharged,
causing
greater
damage
to
the
optic.
If particles
cannot be dislodged, consider leaving well enough alone, rather than risking surface
damage. A fingerprint on a mirror or grating surface should be flushed off as soon as
practical by squirting the surface of the mirror with research-grade methanol from a
clean squeeze bottle. The power to the 270M should be turned off
to
avoid damage to
the electronics, and should remain off until
all
traces of methanol vapor have
dissipated, precluding any risk
of
ignition. Gratings should be removed from the
instrument for flushing. When flushing a mirror, place some paper towels below the
mirror to absorb the excess methanol. Blow off the grating or mirror with dry dusting
gas
or
nitrogen
to
prevent spots or streaks.
Be
careful
to
avoid squirting or splashing
the electronics
or
mechanical components. If the flow from the wash bottle does not
remove the fingerprint, call Spex Customer Service for further advice.
22
Revised November 24.
1992
Leica Microsystems, Inc.'s Ex. 1033
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