
Figure 27. The Double Aperture attachment. A indicates the locating pin at the
bottom of the attachment.
1. Turn on the instrument and allow it to warm up for at least two hours.
2. Remove the optics cover.
3. Mount the double aperture base onto the polarizer mount.
Figure 28. Install the double aperture base onto the polarizer mount.
4. Install the DRA
into the instrument.
5. You must now align the attachment as follows.
6. Place the mask onto the double aperture base so that both apertures are open.
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