Teledyne ProEM Series, System Manual

Page: 59 / 162

Chapter 5 Operation 59
Figure 5-7: Typical WinX/32 Experiment Setup
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Timing Tab
Focusing
The mounting hardware provides two degrees of freedom, focus and rotation. In this
context, focus means to physically move the camera back and forth through the focal
plane of the spectrograph. The approach taken is to slowly move the camera in and out
of focus and adjust for optimum while watching a live display on the monitor, followed
by rotating the camera and again adjusting for optimum. The following procedure,
which describes the focusing operation with a Teledyne Acton Research SP-2356
spectrograph, can be easily adapted to other spectrographs.
1. Mount a light source such as a mercury pen-ray type in front of the entrance slit of
the spectrograph. Any light source with line output can be used. Standard
fluorescent overhead lamps have good calibration lines as well. If there are no "line"
sources available, it is possible to use a broadband source such as tungsten for the
alignment. If this is the case, use a wavelength setting of 0.0 nm for alignment
purposes.
2. With the spectrograph properly connected to the camera, turn the power on, wait
for the spectrograph to initialize. Then set it to 435.8 nm if using a mercury lamp or
to 0.0 nm if using a broadband source.
NOTE:
Overhead fluorescent lights produce a mercury spectrum.
Use a white card tilted at 45 degrees in front of the entrance
slit to reflect overhead light into the spectrograph. Select
435.833 as the spectral line.
3. Set the slit to 25

m. If necessary, adjust the Exposure Time to maintain optimum
(near full-scale) signal intensity.
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