270M
Rapid Scanning Imaging Spectrograph
7 Initial Checks:
7
.1
Equipment Required:
■
■
■
■
HandScan
or
IBM PC/AT compatible computer
If using a computer, you will also need the GMI diskette for parallel
interface control,
or
the Datascan/ SPEX232/ Spex488 support diskette
for
serial
or
GPIB interface control.
Mercury lamp,
or
fluorescent room light.
Photodetector and detection electronics.
7 .2 Checkout:
For HandScan, AutoScan, and QuikScan controlled systems, the wavelength, slit,
turret, mirror, and 220ASH shutter drives will run through a self-test and self-calibration
when the controlling program
or
device runs a hardware initialization routine. For a
fully loaded system, this may require a few minutes, as each automated device is
initialized in sequence. With the top cover removed, you can verify the movement of
the various drives. Do not interfere with
or
force any of the devices
to
move, as this
may result in damage
to
your 270M. With the slit blocking/ height limiting slides open,
you may observe and verify each of the slits opening and closing, in turn, during
initialization. At the end
of
the initialization, the slits will be "closed"
to
a nominal width
of 1 0 microns. Following initialization, depending on the controller you use, the
wavelength drive will be positioned at the calibration switch at the high end
of
its travel,
or
it will be set
to
the nominal center of its range. Some software options will then
reset the various drives
to
their last-used positions.
Assuming that there was no damage discovered during unpacking and installation, the
optics in the 270M should require no further attention.
As an initial check
to
determine that the calibration and alignment are good, you may
verify that the visible mercury lines are passed through the exit.
To
check this,
illuminate the entrance slit with the mercury lamp, and with
your
controller, tune the
wavelength drive
to
546 nm. Note that the correct steps/nm factor must
_be
used when
configuring your controller. A 1200
g/mm
grating in a 270M requires 32
steps/nm
factor. Other grating groove densities require proportionally more
or
less steps/nm.
Wrt:h
the slits opened
to
250 microns, the green line should
be
visible through the exit
slit. If your system has
no
exit slit, hold a piece of ground glass as a focus screen in
the center
of
the spectrograph focal plane
to
find the green image of the entrance slit
(frosted tape on a microscope slide makes a good substitute,
or
use tracing paper).
Extra lamp intensity,
or
a darkened room may help you see it. The same test can be
repeated at the 577 and 579 nm orange doublet lines.
Revised
November 24.
1992
27
Leica Microsystems, Inc.'s Ex. 1033
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