Specifications

34 ST-133/ST-133A Controller Manual Version 2.H
• Short focal-length spectrographs: There is generally a focusing
mechanism on the spectrograph itself which, when adjusted, will move the optics
as required to achieve proper focus.
• No focusing adjustment: If there is no focusing adjustment, either provided
by the spectrograph or by the mounting hardware, then the only recourse will be
to adjust the spectrograph’s focusing mirror.
5. Next adjust the rotation. You can do this by rotating the detector while watching a
live display of the line. The line will go from broad to narrow and back to broad.
Leave the detector rotation set for the narrowest achievable line.
Alternatively, take an image, display the horizontal and vertical cursor bars, and
compare the vertical bar to the line shape on the screen. Rotate the detector until the
line shape on the screen is parallel with the vertical bar.
Note: When aligning other accessories, such as fibers, lenses, optical fiber adapters,
first align the spectrograph to the slit. Then align the accessory without disturbing
the detector position. The procedure is identical to that used to focus the
spectrograph (i.e., do the focus and alignment operations while watching a live
image).
Summary
This completes First Light. If the system functioned as described, you can be reasonably
sure it has arrived in good working order. In addition, you should have a basic
understanding of how the system hardware is used. Other topics, which are important
under certain conditions, are discussed in the following chapters. See the appropriate
application software manual for information on using the software to control the system.