270M
Rapid
Scanning
Imaging
Spectrograph
12 Alignment:
The 270M and its associated grating(s) are aligned together at the factory.
Performance data in the form
of
calibration reports and plots are shipped with the
instrument. Normally you need not make any adjustments
to
the instrument
to
obtain
specified performance. If you suspect the instrument has become misaligned, review
the Optical Components Installation section first, before proceeding
to
Alignment. A
prerequisite
to
these procedures is that the instrument must be completely and
properly installed.
12.1 Equipment Required:
■
■
■
■
■
HandScan
or
IBM PC/AT compatible computer
If using a computer, AutoScan
or
DM3000,
or
the GMI software can be
used
to
control the 270M,
or
the DataScan/ SPEX232/ Spex488 support
diskette program
u232
_ SCAN.BAS
or
488 _ SCAN.BAS. Refer
to
the
Software Installation and Control Interfacing section for further
information on connections and usage.
Mercury lamp,
or
fluorescent room light.
Coupling optics
to
image the source on the entrance slit, in a stable
fashion.
Photodetector such as a silicon cell
or
photomultiplier and housing
adapted
to
the exit slit, and detection electronics such as DataScan
or
DM3000.
12.2 Grating Adjustment:
Caution: Never touch the diffracting surface
of
a grating. The surface is easily marred
and cannot be cleaned as a mirror can. The following three adjustments should be
made on a grating 'the first time it is installed in the instrument. This is done at the
factory when the grating is ordered with the instrument and normally will not require
further attention. Whenever a grating is reinstalled, the adjustments should be checked
. but generally none will be required. -
The wavelength calibration and vertical adjustment can be done in either order, but the
rocking should be done last. For all these procedures the cover
of
the monochromator
must be removed, and a mercury lamp installed at the entrance slit.
42
Revised
November 24,
1992
Leica Microsystems, Inc.'s Ex. 1033
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