28 . Spectrum RX I Getting Started Guide
Adjustment-screw
septum covers
Figure 8 Location of the Adjustment-Screw Septum Covers
NOTE:
The interferometer has been aligned at the factory and should only
need to be optimized by the adjustment during the installation
procedure. For this reason, it is important that you do not turn the
screw more than a quarter-turn in each direction during the following
procedure.