270M
Rapid Scanning Imaging Spectrograph
■
Slit and wavelength drives and accessories
do
not move:
■
If your 270M is equipped with a turret
or
side mirror assembly, you may
test as follows: With the power disconnected, remove the
top
cover and
gently move the mirror
or
turret part way through its range
of
movement.
When the system is powered, the device should return
to
its home
position.
■
Check control cable connections. See
Electrical
Connections
section.
■
Review the section under
Control
Interfacing
that pertains
to
your
controller
or
computer interface software.
■
If you are using your own program, as opposed
to
software purchased
with the system, pay particular attention
to
interfacing setup connections
and parameters.
Background signal
too
high, background reduced when room lights are turned off:
■
Be sure all covers are in place
■
Make sure that the area between the source
or
sample and the entrance
slit is enclosed, and light tight. Block the entrance slit as a test.
■
Check detector mounting
and/
or
housing for light leaks.
■
Starting from the detector, close exit and entrance slits and shutters in
turn
to
determine where stray light may be entering the system. Note that
to
prevent damage
to
the knife edges, the slits
do
not
close completely,
and will therefore not block all
of
the light, however, with the signal
blocked, reducing the slit width will reduce any stray light that is passing
through it.
■
Be sure all openings and screw holes are plugged.
■
Check that the cover, side, and baseplate should fit tightly, light seals
should
be
partly compressed, not flattened.
■
If leaks persist, use a small flashlight in a dark room
to
isolate where the
leaks are
by
shining at any suspicious part
or
joint in the system. and
observing detected signal levels.
Signal
too
noisy:
■
Try
to
increase signal strength at the detector. See
Optical
Interfacing
Considerations
for suggestions.
■
Check
for
light leaks as suggested under "Background signal
too
high" in
this section.
■
If noise is reduced
by
turning off the spectrometer, rearrange power
connections
to
be sure the spectrometer, source, and detector are tied
to
the same ground and, if possible, the same power circuit.
46
Reviaed
November
24.
1992
Leica Microsystems, Inc.'s Ex. 1033
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