M77781A
MS257
™ USB/RS232
MONOCHROMATOR AND SPECTROGRAPH
53
9.5 FILTER WHEELS
Up to two optional filter wheels (Model 77737) can be mounted at the input port(s) of the MS257.
Each filter wheel holds up to five filters
– neutral density, bandpass, interference, etc. The filter
wheels are mounted externally to prevent the refractive index and thickness of the filters from
affecting the focal distance to the collimating mirror. Altering the focal distance could significantly
affect the resolution. A ribbon cable connects each filter wheel to the back panel of the MS257,
which can be configured to automatically control filter selection.
Mount the filter wheel(s) directly on the slit housing using the Oriel flange mounts. Wavelength
changeover points can be loaded into MS257 so that the filters are selected as scanning
progresses. Refer to the Section on the Hand Controller or Programming Manual for details.
Remove the front cover and the filter retaining rings. Install filters, then re-assemble. It is
important to note which filters are installed at each location. This filter number will be displayed in
a window when it is being used.
Figure 19: Filter Installation
